fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/slab.h>
  44 #include <linux/namei.h>
  45 #include <linux/statfs.h>
  46 #include <linux/utsname.h>
  47 #include <linux/pagemap.h>
  48 #include <linux/sunrpc/svcauth_gss.h>
  49
  50 #include "idmap.h"
  51 #include "acl.h"
  52 #include "xdr4.h"
  53 #include "vfs.h"
  54 #include "state.h"
  55 #include "cache.h"
  56 #include "netns.h"
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  59
  60 /*
  61  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  62  * directory in order to indicate to the client that a filesystem boundary is present
  63  * We use a fixed fsid for a referral
  64  */
  65 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  66 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  67
  68 static __be32
  69 check_filename(char *str, int len)
  70 {
  71         int i;
  72
  73         if (len == 0)
  74                 return nfserr_inval;
  75         if (isdotent(str, len))
  76                 return nfserr_badname;
  77         for (i = 0; i < len; i++)
  78                 if (str[i] == '/')
  79                         return nfserr_badname;
  80         return 0;
  81 }
  82
  83 #define DECODE_HEAD                             \
  84         __be32 *p;                              \
  85         __be32 status
  86 #define DECODE_TAIL                             \
  87         status = 0;                             \
  88 out:                                            \
  89         return status;                          \
  90 xdr_error:                                      \
  91         dprintk("NFSD: xdr error (%s:%d)\n",    \
  92                         __FILE__, __LINE__);    \
  93         status = nfserr_bad_xdr;                \
  94         goto out
  95
  96 #define READ32(x)         (x) = ntohl(*p++)
  97 #define READ64(x)         do {                  \
  98         (x) = (u64)ntohl(*p++) << 32;           \
  99         (x) |= ntohl(*p++);                     \
 100 } while (0)
 101 #define READTIME(x)       do {                  \
 102         p++;                                    \
 103         (x) = ntohl(*p++);                      \
 104         p++;                                    \
 105 } while (0)
 106 #define READMEM(x,nbytes) do {                  \
 107         x = (char *)p;                          \
 108         p += XDR_QUADLEN(nbytes);               \
 109 } while (0)
 110 #define SAVEMEM(x,nbytes) do {                  \
 111         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 112                 savemem(argp, p, nbytes) :      \
 113                 (char *)p)) {                   \
 114                 dprintk("NFSD: xdr error (%s:%d)\n", \
 115                                 __FILE__, __LINE__); \
 116                 goto xdr_error;                 \
 117                 }                               \
 118         p += XDR_QUADLEN(nbytes);               \
 119 } while (0)
 120 #define COPYMEM(x,nbytes) do {                  \
 121         memcpy((x), p, nbytes);                 \
 122         p += XDR_QUADLEN(nbytes);               \
 123 } while (0)
 124
 125 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 126 #define READ_BUF(nbytes)  do {                  \
 127         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 128                 p = argp->p;                    \
 129                 argp->p += XDR_QUADLEN(nbytes); \
 130         } else if (!(p = read_buf(argp, nbytes))) { \
 131                 dprintk("NFSD: xdr error (%s:%d)\n", \
 132                                 __FILE__, __LINE__); \
 133                 goto xdr_error;                 \
 134         }                                       \
 135 } while (0)
 136
 137 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 138 {
 139         /* We want more bytes than seem to be available.
 140          * Maybe we need a new page, maybe we have just run out
 141          */
 142         unsigned int avail = (char *)argp->end - (char *)argp->p;
 143         __be32 *p;
 144         if (avail + argp->pagelen < nbytes)
 145                 return NULL;
 146         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 147                 return NULL;
 148         /* ok, we can do it with the current plus the next page */
 149         if (nbytes <= sizeof(argp->tmp))
 150                 p = argp->tmp;
 151         else {
 152                 kfree(argp->tmpp);
 153                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 154                 if (!p)
 155                         return NULL;
 156
 157         }
 158         /*
 159          * The following memcpy is safe because read_buf is always
 160          * called with nbytes > avail, and the two cases above both
 161          * guarantee p points to at least nbytes bytes.
 162          */
 163         memcpy(p, argp->p, avail);
 164         /* step to next page */
 165         argp->pagelist++;
 166         argp->p = page_address(argp->pagelist[0]);
 167         if (argp->pagelen < PAGE_SIZE) {
 168                 argp->end = argp->p + (argp->pagelen>>2);
 169                 argp->pagelen = 0;
 170         } else {
 171                 argp->end = argp->p + (PAGE_SIZE>>2);
 172                 argp->pagelen -= PAGE_SIZE;
 173         }
 174         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 175         argp->p += XDR_QUADLEN(nbytes - avail);
 176         return p;
 177 }
 178
 179 static int zero_clientid(clientid_t *clid)
 180 {
 181         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 182 }
 183
 184 static int
 185 defer_free(struct nfsd4_compoundargs *argp,
 186                 void (*release)(const void *), void *p)
 187 {
 188         struct tmpbuf *tb;
 189
 190         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 191         if (!tb)
 192                 return -ENOMEM;
 193         tb->buf = p;
 194         tb->release = release;
 195         tb->next = argp->to_free;
 196         argp->to_free = tb;
 197         return 0;
 198 }
 199
 200 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 201 {
 202         if (p == argp->tmp) {
 203                 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
 204                 if (!p)
 205                         return NULL;
 206         } else {
 207                 BUG_ON(p != argp->tmpp);
 208                 argp->tmpp = NULL;
 209         }
 210         if (defer_free(argp, kfree, p)) {
 211                 kfree(p);
 212                 return NULL;
 213         } else
 214                 return (char *)p;
 215 }
 216
 217 static __be32
 218 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 219 {
 220         u32 bmlen;
 221         DECODE_HEAD;
 222
 223         bmval[0] = 0;
 224         bmval[1] = 0;
 225         bmval[2] = 0;
 226
 227         READ_BUF(4);
 228         READ32(bmlen);
 229         if (bmlen > 1000)
 230                 goto xdr_error;
 231
 232         READ_BUF(bmlen << 2);
 233         if (bmlen > 0)
 234                 READ32(bmval[0]);
 235         if (bmlen > 1)
 236                 READ32(bmval[1]);
 237         if (bmlen > 2)
 238                 READ32(bmval[2]);
 239
 240         DECODE_TAIL;
 241 }
 242
 243 static __be32
 244 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 245                    struct iattr *iattr, struct nfs4_acl **acl)
 246 {
 247         int expected_len, len = 0;
 248         u32 dummy32;
 249         char *buf;
 250         int host_err;
 251
 252         DECODE_HEAD;
 253         iattr->ia_valid = 0;
 254         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 255                 return status;
 256
 257         READ_BUF(4);
 258         READ32(expected_len);
 259
 260         if (bmval[0] & FATTR4_WORD0_SIZE) {
 261                 READ_BUF(8);
 262                 len += 8;
 263                 READ64(iattr->ia_size);
 264                 iattr->ia_valid |= ATTR_SIZE;
 265         }
 266         if (bmval[0] & FATTR4_WORD0_ACL) {
 267                 u32 nace;
 268                 struct nfs4_ace *ace;
 269
 270                 READ_BUF(4); len += 4;
 271                 READ32(nace);
 272
 273                 if (nace > NFS4_ACL_MAX)
 274                         return nfserr_resource;
 275
 276                 *acl = nfs4_acl_new(nace);
 277                 if (*acl == NULL) {
 278                         host_err = -ENOMEM;
 279                         goto out_nfserr;
 280                 }
 281                 defer_free(argp, kfree, *acl);
 282
 283                 (*acl)->naces = nace;
 284                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 285                         READ_BUF(16); len += 16;
 286                         READ32(ace->type);
 287                         READ32(ace->flag);
 288                         READ32(ace->access_mask);
 289                         READ32(dummy32);
 290                         READ_BUF(dummy32);
 291                         len += XDR_QUADLEN(dummy32) << 2;
 292                         READMEM(buf, dummy32);
 293                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 294                         status = nfs_ok;
 295                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 296                                 ;
 297                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 298                                 status = nfsd_map_name_to_gid(argp->rqstp,
 299                                                 buf, dummy32, &ace->who_gid);
 300                         else
 301                                 status = nfsd_map_name_to_uid(argp->rqstp,
 302                                                 buf, dummy32, &ace->who_uid);
 303                         if (status)
 304                                 return status;
 305                 }
 306         } else
 307                 *acl = NULL;
 308         if (bmval[1] & FATTR4_WORD1_MODE) {
 309                 READ_BUF(4);
 310                 len += 4;
 311                 READ32(iattr->ia_mode);
 312                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 313                 iattr->ia_valid |= ATTR_MODE;
 314         }
 315         if (bmval[1] & FATTR4_WORD1_OWNER) {
 316                 READ_BUF(4);
 317                 len += 4;
 318                 READ32(dummy32);
 319                 READ_BUF(dummy32);
 320                 len += (XDR_QUADLEN(dummy32) << 2);
 321                 READMEM(buf, dummy32);
 322                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 323                         return status;
 324                 iattr->ia_valid |= ATTR_UID;
 325         }
 326         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 327                 READ_BUF(4);
 328                 len += 4;
 329                 READ32(dummy32);
 330                 READ_BUF(dummy32);
 331                 len += (XDR_QUADLEN(dummy32) << 2);
 332                 READMEM(buf, dummy32);
 333                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 334                         return status;
 335                 iattr->ia_valid |= ATTR_GID;
 336         }
 337         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 338                 READ_BUF(4);
 339                 len += 4;
 340                 READ32(dummy32);
 341                 switch (dummy32) {
 342                 case NFS4_SET_TO_CLIENT_TIME:
 343                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 344                            all 32 bits of 'nseconds'. */
 345                         READ_BUF(12);
 346                         len += 12;
 347                         READ64(iattr->ia_atime.tv_sec);
 348                         READ32(iattr->ia_atime.tv_nsec);
 349                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 350                                 return nfserr_inval;
 351                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 352                         break;
 353                 case NFS4_SET_TO_SERVER_TIME:
 354                         iattr->ia_valid |= ATTR_ATIME;
 355                         break;
 356                 default:
 357                         goto xdr_error;
 358                 }
 359         }
 360         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 361                 READ_BUF(4);
 362                 len += 4;
 363                 READ32(dummy32);
 364                 switch (dummy32) {
 365                 case NFS4_SET_TO_CLIENT_TIME:
 366                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 367                            all 32 bits of 'nseconds'. */
 368                         READ_BUF(12);
 369                         len += 12;
 370                         READ64(iattr->ia_mtime.tv_sec);
 371                         READ32(iattr->ia_mtime.tv_nsec);
 372                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 373                                 return nfserr_inval;
 374                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 375                         break;
 376                 case NFS4_SET_TO_SERVER_TIME:
 377                         iattr->ia_valid |= ATTR_MTIME;
 378                         break;
 379                 default:
 380                         goto xdr_error;
 381                 }
 382         }
 383         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 384             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 385             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 386                 READ_BUF(expected_len - len);
 387         else if (len != expected_len)
 388                 goto xdr_error;
 389
 390         DECODE_TAIL;
 391
 392 out_nfserr:
 393         status = nfserrno(host_err);
 394         goto out;
 395 }
 396
 397 static __be32
 398 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 399 {
 400         DECODE_HEAD;
 401
 402         READ_BUF(sizeof(stateid_t));
 403         READ32(sid->si_generation);
 404         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 405
 406         DECODE_TAIL;
 407 }
 408
 409 static __be32
 410 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 411 {
 412         DECODE_HEAD;
 413
 414         READ_BUF(4);
 415         READ32(access->ac_req_access);
 416
 417         DECODE_TAIL;
 418 }
 419
 420 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 421 {
 422         DECODE_HEAD;
 423         u32 dummy, uid, gid;
 424         char *machine_name;
 425         int i;
 426         int nr_secflavs;
 427
 428         /* callback_sec_params4 */
 429         READ_BUF(4);
 430         READ32(nr_secflavs);
 431         cbs->flavor = (u32)(-1);
 432         for (i = 0; i < nr_secflavs; ++i) {
 433                 READ_BUF(4);
 434                 READ32(dummy);
 435                 switch (dummy) {
 436                 case RPC_AUTH_NULL:
 437                         /* Nothing to read */
 438                         if (cbs->flavor == (u32)(-1))
 439                                 cbs->flavor = RPC_AUTH_NULL;
 440                         break;
 441                 case RPC_AUTH_UNIX:
 442                         READ_BUF(8);
 443                         /* stamp */
 444                         READ32(dummy);
 445
 446                         /* machine name */
 447                         READ32(dummy);
 448                         READ_BUF(dummy);
 449                         SAVEMEM(machine_name, dummy);
 450
 451                         /* uid, gid */
 452                         READ_BUF(8);
 453                         READ32(uid);
 454                         READ32(gid);
 455
 456                         /* more gids */
 457                         READ_BUF(4);
 458                         READ32(dummy);
 459                         READ_BUF(dummy * 4);
 460                         if (cbs->flavor == (u32)(-1)) {
 461                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 462                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 463                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 464                                         cbs->uid = kuid;
 465                                         cbs->gid = kgid;
 466                                         cbs->flavor = RPC_AUTH_UNIX;
 467                                 } else {
 468                                         dprintk("RPC_AUTH_UNIX with invalid"
 469                                                 "uid or gid ignoring!\n");
 470                                 }
 471                         }
 472                         break;
 473                 case RPC_AUTH_GSS:
 474                         dprintk("RPC_AUTH_GSS callback secflavor "
 475                                 "not supported!\n");
 476                         READ_BUF(8);
 477                         /* gcbp_service */
 478                         READ32(dummy);
 479                         /* gcbp_handle_from_server */
 480                         READ32(dummy);
 481                         READ_BUF(dummy);
 482                         p += XDR_QUADLEN(dummy);
 483                         /* gcbp_handle_from_client */
 484                         READ_BUF(4);
 485                         READ32(dummy);
 486                         READ_BUF(dummy);
 487                         break;
 488                 default:
 489                         dprintk("Illegal callback secflavor\n");
 490                         return nfserr_inval;
 491                 }
 492         }
 493         DECODE_TAIL;
 494 }
 495
 496 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 497 {
 498         DECODE_HEAD;
 499
 500         READ_BUF(4);
 501         READ32(bc->bc_cb_program);
 502         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 503
 504         DECODE_TAIL;
 505 }
 506
 507 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 508 {
 509         DECODE_HEAD;
 510
 511         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 512         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 513         READ32(bcts->dir);
 514         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 515          * could help us figure out we should be using it. */
 516         DECODE_TAIL;
 517 }
 518
 519 static __be32
 520 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 521 {
 522         DECODE_HEAD;
 523
 524         READ_BUF(4);
 525         READ32(close->cl_seqid);
 526         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 527
 528         DECODE_TAIL;
 529 }
 530
 531
 532 static __be32
 533 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 534 {
 535         DECODE_HEAD;
 536
 537         READ_BUF(12);
 538         READ64(commit->co_offset);
 539         READ32(commit->co_count);
 540
 541         DECODE_TAIL;
 542 }
 543
 544 static __be32
 545 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 546 {
 547         DECODE_HEAD;
 548
 549         READ_BUF(4);
 550         READ32(create->cr_type);
 551         switch (create->cr_type) {
 552         case NF4LNK:
 553                 READ_BUF(4);
 554                 READ32(create->cr_linklen);
 555                 READ_BUF(create->cr_linklen);
 556                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 557                 break;
 558         case NF4BLK:
 559         case NF4CHR:
 560                 READ_BUF(8);
 561                 READ32(create->cr_specdata1);
 562                 READ32(create->cr_specdata2);
 563                 break;
 564         case NF4SOCK:
 565         case NF4FIFO:
 566         case NF4DIR:
 567         default:
 568                 break;
 569         }
 570
 571         READ_BUF(4);
 572         READ32(create->cr_namelen);
 573         READ_BUF(create->cr_namelen);
 574         SAVEMEM(create->cr_name, create->cr_namelen);
 575         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 576                 return status;
 577
 578         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 579                                     &create->cr_acl);
 580         if (status)
 581                 goto out;
 582
 583         DECODE_TAIL;
 584 }
 585
 586 static inline __be32
 587 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 588 {
 589         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 590 }
 591
 592 static inline __be32
 593 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 594 {
 595         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 596 }
 597
 598 static __be32
 599 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 600 {
 601         DECODE_HEAD;
 602
 603         READ_BUF(4);
 604         READ32(link->li_namelen);
 605         READ_BUF(link->li_namelen);
 606         SAVEMEM(link->li_name, link->li_namelen);
 607         if ((status = check_filename(link->li_name, link->li_namelen)))
 608                 return status;
 609
 610         DECODE_TAIL;
 611 }
 612
 613 static __be32
 614 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 615 {
 616         DECODE_HEAD;
 617
 618         /*
 619         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 620         */
 621         READ_BUF(28);
 622         READ32(lock->lk_type);
 623         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 624                 goto xdr_error;
 625         READ32(lock->lk_reclaim);
 626         READ64(lock->lk_offset);
 627         READ64(lock->lk_length);
 628         READ32(lock->lk_is_new);
 629
 630         if (lock->lk_is_new) {
 631                 READ_BUF(4);
 632                 READ32(lock->lk_new_open_seqid);
 633                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 634                 if (status)
 635                         return status;
 636                 READ_BUF(8 + sizeof(clientid_t));
 637                 READ32(lock->lk_new_lock_seqid);
 638                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 639                 READ32(lock->lk_new_owner.len);
 640                 READ_BUF(lock->lk_new_owner.len);
 641                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 642         } else {
 643                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 644                 if (status)
 645                         return status;
 646                 READ_BUF(4);
 647                 READ32(lock->lk_old_lock_seqid);
 648         }
 649
 650         DECODE_TAIL;
 651 }
 652
 653 static __be32
 654 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 655 {
 656         DECODE_HEAD;
 657
 658         READ_BUF(32);
 659         READ32(lockt->lt_type);
 660         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 661                 goto xdr_error;
 662         READ64(lockt->lt_offset);
 663         READ64(lockt->lt_length);
 664         COPYMEM(&lockt->lt_clientid, 8);
 665         READ32(lockt->lt_owner.len);
 666         READ_BUF(lockt->lt_owner.len);
 667         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 668
 669         DECODE_TAIL;
 670 }
 671
 672 static __be32
 673 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 674 {
 675         DECODE_HEAD;
 676
 677         READ_BUF(8);
 678         READ32(locku->lu_type);
 679         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 680                 goto xdr_error;
 681         READ32(locku->lu_seqid);
 682         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 683         if (status)
 684                 return status;
 685         READ_BUF(16);
 686         READ64(locku->lu_offset);
 687         READ64(locku->lu_length);
 688
 689         DECODE_TAIL;
 690 }
 691
 692 static __be32
 693 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 694 {
 695         DECODE_HEAD;
 696
 697         READ_BUF(4);
 698         READ32(lookup->lo_len);
 699         READ_BUF(lookup->lo_len);
 700         SAVEMEM(lookup->lo_name, lookup->lo_len);
 701         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 702                 return status;
 703
 704         DECODE_TAIL;
 705 }
 706
 707 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 708 {
 709         __be32 *p;
 710         u32 w;
 711
 712         READ_BUF(4);
 713         READ32(w);
 714         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 715         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 716         if (deleg_when)
 717                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 718
 719         switch (w & NFS4_SHARE_ACCESS_MASK) {
 720         case NFS4_SHARE_ACCESS_READ:
 721         case NFS4_SHARE_ACCESS_WRITE:
 722         case NFS4_SHARE_ACCESS_BOTH:
 723                 break;
 724         default:
 725                 return nfserr_bad_xdr;
 726         }
 727         w &= ~NFS4_SHARE_ACCESS_MASK;
 728         if (!w)
 729                 return nfs_ok;
 730         if (!argp->minorversion)
 731                 return nfserr_bad_xdr;
 732         switch (w & NFS4_SHARE_WANT_MASK) {
 733         case NFS4_SHARE_WANT_NO_PREFERENCE:
 734         case NFS4_SHARE_WANT_READ_DELEG:
 735         case NFS4_SHARE_WANT_WRITE_DELEG:
 736         case NFS4_SHARE_WANT_ANY_DELEG:
 737         case NFS4_SHARE_WANT_NO_DELEG:
 738         case NFS4_SHARE_WANT_CANCEL:
 739                 break;
 740         default:
 741                 return nfserr_bad_xdr;
 742         }
 743         w &= ~NFS4_SHARE_WANT_MASK;
 744         if (!w)
 745                 return nfs_ok;
 746
 747         if (!deleg_when)        /* open_downgrade */
 748                 return nfserr_inval;
 749         switch (w) {
 750         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 751         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 752         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 753               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 754                 return nfs_ok;
 755         }
 756 xdr_error:
 757         return nfserr_bad_xdr;
 758 }
 759
 760 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 761 {
 762         __be32 *p;
 763
 764         READ_BUF(4);
 765         READ32(*x);
 766         /* Note: unlinke access bits, deny bits may be zero. */
 767         if (*x & ~NFS4_SHARE_DENY_BOTH)
 768                 return nfserr_bad_xdr;
 769         return nfs_ok;
 770 xdr_error:
 771         return nfserr_bad_xdr;
 772 }
 773
 774 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 775 {
 776         __be32 *p;
 777
 778         READ_BUF(4);
 779         READ32(o->len);
 780
 781         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 782                 return nfserr_bad_xdr;
 783
 784         READ_BUF(o->len);
 785         SAVEMEM(o->data, o->len);
 786         return nfs_ok;
 787 xdr_error:
 788         return nfserr_bad_xdr;
 789 }
 790
 791 static __be32
 792 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 793 {
 794         DECODE_HEAD;
 795         u32 dummy;
 796
 797         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 798         open->op_iattr.ia_valid = 0;
 799         open->op_openowner = NULL;
 800
 801         open->op_xdr_error = 0;
 802         /* seqid, share_access, share_deny, clientid, ownerlen */
 803         READ_BUF(4);
 804         READ32(open->op_seqid);
 805         /* decode, yet ignore deleg_when until supported */
 806         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 807                                            &open->op_deleg_want, &dummy);
 808         if (status)
 809                 goto xdr_error;
 810         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 811         if (status)
 812                 goto xdr_error;
 813         READ_BUF(sizeof(clientid_t));
 814         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 815         status = nfsd4_decode_opaque(argp, &open->op_owner);
 816         if (status)
 817                 goto xdr_error;
 818         READ_BUF(4);
 819         READ32(open->op_create);
 820         switch (open->op_create) {
 821         case NFS4_OPEN_NOCREATE:
 822                 break;
 823         case NFS4_OPEN_CREATE:
 824                 READ_BUF(4);
 825                 READ32(open->op_createmode);
 826                 switch (open->op_createmode) {
 827                 case NFS4_CREATE_UNCHECKED:
 828                 case NFS4_CREATE_GUARDED:
 829                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 830                                 &open->op_iattr, &open->op_acl);
 831                         if (status)
 832                                 goto out;
 833                         break;
 834                 case NFS4_CREATE_EXCLUSIVE:
 835                         READ_BUF(NFS4_VERIFIER_SIZE);
 836                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 837                         break;
 838                 case NFS4_CREATE_EXCLUSIVE4_1:
 839                         if (argp->minorversion < 1)
 840                                 goto xdr_error;
 841                         READ_BUF(NFS4_VERIFIER_SIZE);
 842                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 843                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 844                                 &open->op_iattr, &open->op_acl);
 845                         if (status)
 846                                 goto out;
 847                         break;
 848                 default:
 849                         goto xdr_error;
 850                 }
 851                 break;
 852         default:
 853                 goto xdr_error;
 854         }
 855
 856         /* open_claim */
 857         READ_BUF(4);
 858         READ32(open->op_claim_type);
 859         switch (open->op_claim_type) {
 860         case NFS4_OPEN_CLAIM_NULL:
 861         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 862                 READ_BUF(4);
 863                 READ32(open->op_fname.len);
 864                 READ_BUF(open->op_fname.len);
 865                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 866                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 867                         return status;
 868                 break;
 869         case NFS4_OPEN_CLAIM_PREVIOUS:
 870                 READ_BUF(4);
 871                 READ32(open->op_delegate_type);
 872                 break;
 873         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 874                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 875                 if (status)
 876                         return status;
 877                 READ_BUF(4);
 878                 READ32(open->op_fname.len);
 879                 READ_BUF(open->op_fname.len);
 880                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 881                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 882                         return status;
 883                 break;
 884         case NFS4_OPEN_CLAIM_FH:
 885         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 886                 if (argp->minorversion < 1)
 887                         goto xdr_error;
 888                 /* void */
 889                 break;
 890         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 891                 if (argp->minorversion < 1)
 892                         goto xdr_error;
 893                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 894                 if (status)
 895                         return status;
 896                 break;
 897         default:
 898                 goto xdr_error;
 899         }
 900
 901         DECODE_TAIL;
 902 }
 903
 904 static __be32
 905 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 906 {
 907         DECODE_HEAD;
 908
 909         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 910         if (status)
 911                 return status;
 912         READ_BUF(4);
 913         READ32(open_conf->oc_seqid);
 914
 915         DECODE_TAIL;
 916 }
 917
 918 static __be32
 919 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 920 {
 921         DECODE_HEAD;
 922
 923         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 924         if (status)
 925                 return status;
 926         READ_BUF(4);
 927         READ32(open_down->od_seqid);
 928         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 929                                            &open_down->od_deleg_want, NULL);
 930         if (status)
 931                 return status;
 932         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 933         if (status)
 934                 return status;
 935         DECODE_TAIL;
 936 }
 937
 938 static __be32
 939 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 940 {
 941         DECODE_HEAD;
 942
 943         READ_BUF(4);
 944         READ32(putfh->pf_fhlen);
 945         if (putfh->pf_fhlen > NFS4_FHSIZE)
 946                 goto xdr_error;
 947         READ_BUF(putfh->pf_fhlen);
 948         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 949
 950         DECODE_TAIL;
 951 }
 952
 953 static __be32
 954 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 955 {
 956         DECODE_HEAD;
 957
 958         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 959         if (status)
 960                 return status;
 961         READ_BUF(12);
 962         READ64(read->rd_offset);
 963         READ32(read->rd_length);
 964
 965         DECODE_TAIL;
 966 }
 967
 968 static __be32
 969 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 970 {
 971         DECODE_HEAD;
 972
 973         READ_BUF(24);
 974         READ64(readdir->rd_cookie);
 975         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 976         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 977         READ32(readdir->rd_maxcount);
 978         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 979                 goto out;
 980
 981         DECODE_TAIL;
 982 }
 983
 984 static __be32
 985 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 986 {
 987         DECODE_HEAD;
 988
 989         READ_BUF(4);
 990         READ32(remove->rm_namelen);
 991         READ_BUF(remove->rm_namelen);
 992         SAVEMEM(remove->rm_name, remove->rm_namelen);
 993         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
 994                 return status;
 995
 996         DECODE_TAIL;
 997 }
 998
 999 static __be32
1000 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1001 {
1002         DECODE_HEAD;
1003
1004         READ_BUF(4);
1005         READ32(rename->rn_snamelen);
1006         READ_BUF(rename->rn_snamelen + 4);
1007         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1008         READ32(rename->rn_tnamelen);
1009         READ_BUF(rename->rn_tnamelen);
1010         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1011         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1012                 return status;
1013         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1014                 return status;
1015
1016         DECODE_TAIL;
1017 }
1018
1019 static __be32
1020 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1021 {
1022         DECODE_HEAD;
1023
1024         READ_BUF(sizeof(clientid_t));
1025         COPYMEM(clientid, sizeof(clientid_t));
1026
1027         DECODE_TAIL;
1028 }
1029
1030 static __be32
1031 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1032                      struct nfsd4_secinfo *secinfo)
1033 {
1034         DECODE_HEAD;
1035
1036         READ_BUF(4);
1037         READ32(secinfo->si_namelen);
1038         READ_BUF(secinfo->si_namelen);
1039         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1040         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1041         if (status)
1042                 return status;
1043         DECODE_TAIL;
1044 }
1045
1046 static __be32
1047 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1048                      struct nfsd4_secinfo_no_name *sin)
1049 {
1050         DECODE_HEAD;
1051
1052         READ_BUF(4);
1053         READ32(sin->sin_style);
1054         DECODE_TAIL;
1055 }
1056
1057 static __be32
1058 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1059 {
1060         __be32 status;
1061
1062         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1063         if (status)
1064                 return status;
1065         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1066                                   &setattr->sa_acl);
1067 }
1068
1069 static __be32
1070 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1071 {
1072         DECODE_HEAD;
1073
1074         READ_BUF(NFS4_VERIFIER_SIZE);
1075         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1076
1077         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1078         if (status)
1079                 return nfserr_bad_xdr;
1080         READ_BUF(8);
1081         READ32(setclientid->se_callback_prog);
1082         READ32(setclientid->se_callback_netid_len);
1083
1084         READ_BUF(setclientid->se_callback_netid_len + 4);
1085         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1086         READ32(setclientid->se_callback_addr_len);
1087
1088         READ_BUF(setclientid->se_callback_addr_len + 4);
1089         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1090         READ32(setclientid->se_callback_ident);
1091
1092         DECODE_TAIL;
1093 }
1094
1095 static __be32
1096 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1097 {
1098         DECODE_HEAD;
1099
1100         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1101         COPYMEM(&scd_c->sc_clientid, 8);
1102         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1103
1104         DECODE_TAIL;
1105 }
1106
1107 /* Also used for NVERIFY */
1108 static __be32
1109 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1110 {
1111         DECODE_HEAD;
1112
1113         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1114                 goto out;
1115
1116         /* For convenience's sake, we compare raw xdr'd attributes in
1117          * nfsd4_proc_verify */
1118
1119         READ_BUF(4);
1120         READ32(verify->ve_attrlen);
1121         READ_BUF(verify->ve_attrlen);
1122         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1123
1124         DECODE_TAIL;
1125 }
1126
1127 static __be32
1128 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1129 {
1130         int avail;
1131         int len;
1132         DECODE_HEAD;
1133
1134         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1135         if (status)
1136                 return status;
1137         READ_BUF(16);
1138         READ64(write->wr_offset);
1139         READ32(write->wr_stable_how);
1140         if (write->wr_stable_how > 2)
1141                 goto xdr_error;
1142         READ32(write->wr_buflen);
1143
1144         /* Sorry .. no magic macros for this.. *
1145          * READ_BUF(write->wr_buflen);
1146          * SAVEMEM(write->wr_buf, write->wr_buflen);
1147          */
1148         avail = (char*)argp->end - (char*)argp->p;
1149         if (avail + argp->pagelen < write->wr_buflen) {
1150                 dprintk("NFSD: xdr error (%s:%d)\n",
1151                                 __FILE__, __LINE__);
1152                 goto xdr_error;
1153         }
1154         write->wr_head.iov_base = p;
1155         write->wr_head.iov_len = avail;
1156         WARN_ON(avail != (XDR_QUADLEN(avail) << 2));
1157         write->wr_pagelist = argp->pagelist;
1158
1159         len = XDR_QUADLEN(write->wr_buflen) << 2;
1160         if (len >= avail) {
1161                 int pages;
1162
1163                 len -= avail;
1164
1165                 pages = len >> PAGE_SHIFT;
1166                 argp->pagelist += pages;
1167                 argp->pagelen -= pages * PAGE_SIZE;
1168                 len -= pages * PAGE_SIZE;
1169
1170                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1171                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1172         }
1173         argp->p += XDR_QUADLEN(len);
1174
1175         DECODE_TAIL;
1176 }
1177
1178 static __be32
1179 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1180 {
1181         DECODE_HEAD;
1182
1183         READ_BUF(12);
1184         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1185         READ32(rlockowner->rl_owner.len);
1186         READ_BUF(rlockowner->rl_owner.len);
1187         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1188
1189         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1190                 return nfserr_inval;
1191         DECODE_TAIL;
1192 }
1193
1194 static __be32
1195 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1196                          struct nfsd4_exchange_id *exid)
1197 {
1198         int dummy, tmp;
1199         DECODE_HEAD;
1200
1201         READ_BUF(NFS4_VERIFIER_SIZE);
1202         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1203
1204         status = nfsd4_decode_opaque(argp, &exid->clname);
1205         if (status)
1206                 return nfserr_bad_xdr;
1207
1208         READ_BUF(4);
1209         READ32(exid->flags);
1210
1211         /* Ignore state_protect4_a */
1212         READ_BUF(4);
1213         READ32(exid->spa_how);
1214         switch (exid->spa_how) {
1215         case SP4_NONE:
1216                 break;
1217         case SP4_MACH_CRED:
1218                 /* spo_must_enforce */
1219                 READ_BUF(4);
1220                 READ32(dummy);
1221                 READ_BUF(dummy * 4);
1222                 p += dummy;
1223
1224                 /* spo_must_allow */
1225                 READ_BUF(4);
1226                 READ32(dummy);
1227                 READ_BUF(dummy * 4);
1228                 p += dummy;
1229                 break;
1230         case SP4_SSV:
1231                 /* ssp_ops */
1232                 READ_BUF(4);
1233                 READ32(dummy);
1234                 READ_BUF(dummy * 4);
1235                 p += dummy;
1236
1237                 READ_BUF(4);
1238                 READ32(dummy);
1239                 READ_BUF(dummy * 4);
1240                 p += dummy;
1241
1242                 /* ssp_hash_algs<> */
1243                 READ_BUF(4);
1244                 READ32(tmp);
1245                 while (tmp--) {
1246                         READ_BUF(4);
1247                         READ32(dummy);
1248                         READ_BUF(dummy);
1249                         p += XDR_QUADLEN(dummy);
1250                 }
1251
1252                 /* ssp_encr_algs<> */
1253                 READ_BUF(4);
1254                 READ32(tmp);
1255                 while (tmp--) {
1256                         READ_BUF(4);
1257                         READ32(dummy);
1258                         READ_BUF(dummy);
1259                         p += XDR_QUADLEN(dummy);
1260                 }
1261
1262                 /* ssp_window and ssp_num_gss_handles */
1263                 READ_BUF(8);
1264                 READ32(dummy);
1265                 READ32(dummy);
1266                 break;
1267         default:
1268                 goto xdr_error;
1269         }
1270
1271         /* Ignore Implementation ID */
1272         READ_BUF(4);    /* nfs_impl_id4 array length */
1273         READ32(dummy);
1274
1275         if (dummy > 1)
1276                 goto xdr_error;
1277
1278         if (dummy == 1) {
1279                 /* nii_domain */
1280                 READ_BUF(4);
1281                 READ32(dummy);
1282                 READ_BUF(dummy);
1283                 p += XDR_QUADLEN(dummy);
1284
1285                 /* nii_name */
1286                 READ_BUF(4);
1287                 READ32(dummy);
1288                 READ_BUF(dummy);
1289                 p += XDR_QUADLEN(dummy);
1290
1291                 /* nii_date */
1292                 READ_BUF(12);
1293                 p += 3;
1294         }
1295         DECODE_TAIL;
1296 }
1297
1298 static __be32
1299 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1300                             struct nfsd4_create_session *sess)
1301 {
1302         DECODE_HEAD;
1303         u32 dummy;
1304
1305         READ_BUF(16);
1306         COPYMEM(&sess->clientid, 8);
1307         READ32(sess->seqid);
1308         READ32(sess->flags);
1309
1310         /* Fore channel attrs */
1311         READ_BUF(28);
1312         READ32(dummy); /* headerpadsz is always 0 */
1313         READ32(sess->fore_channel.maxreq_sz);
1314         READ32(sess->fore_channel.maxresp_sz);
1315         READ32(sess->fore_channel.maxresp_cached);
1316         READ32(sess->fore_channel.maxops);
1317         READ32(sess->fore_channel.maxreqs);
1318         READ32(sess->fore_channel.nr_rdma_attrs);
1319         if (sess->fore_channel.nr_rdma_attrs == 1) {
1320                 READ_BUF(4);
1321                 READ32(sess->fore_channel.rdma_attrs);
1322         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1323                 dprintk("Too many fore channel attr bitmaps!\n");
1324                 goto xdr_error;
1325         }
1326
1327         /* Back channel attrs */
1328         READ_BUF(28);
1329         READ32(dummy); /* headerpadsz is always 0 */
1330         READ32(sess->back_channel.maxreq_sz);
1331         READ32(sess->back_channel.maxresp_sz);
1332         READ32(sess->back_channel.maxresp_cached);
1333         READ32(sess->back_channel.maxops);
1334         READ32(sess->back_channel.maxreqs);
1335         READ32(sess->back_channel.nr_rdma_attrs);
1336         if (sess->back_channel.nr_rdma_attrs == 1) {
1337                 READ_BUF(4);
1338                 READ32(sess->back_channel.rdma_attrs);
1339         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1340                 dprintk("Too many back channel attr bitmaps!\n");
1341                 goto xdr_error;
1342         }
1343
1344         READ_BUF(4);
1345         READ32(sess->callback_prog);
1346         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1347         DECODE_TAIL;
1348 }
1349
1350 static __be32
1351 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1352                              struct nfsd4_destroy_session *destroy_session)
1353 {
1354         DECODE_HEAD;
1355         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1356         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1357
1358         DECODE_TAIL;
1359 }
1360
1361 static __be32
1362 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1363                           struct nfsd4_free_stateid *free_stateid)
1364 {
1365         DECODE_HEAD;
1366
1367         READ_BUF(sizeof(stateid_t));
1368         READ32(free_stateid->fr_stateid.si_generation);
1369         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1370
1371         DECODE_TAIL;
1372 }
1373
1374 static __be32
1375 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1376                       struct nfsd4_sequence *seq)
1377 {
1378         DECODE_HEAD;
1379
1380         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1381         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1382         READ32(seq->seqid);
1383         READ32(seq->slotid);
1384         READ32(seq->maxslots);
1385         READ32(seq->cachethis);
1386
1387         DECODE_TAIL;
1388 }
1389
1390 static __be32
1391 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1392 {
1393         int i;
1394         __be32 *p, status;
1395         struct nfsd4_test_stateid_id *stateid;
1396
1397         READ_BUF(4);
1398         test_stateid->ts_num_ids = ntohl(*p++);
1399
1400         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1401
1402         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1403                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1404                 if (!stateid) {
1405                         status = nfserrno(-ENOMEM);
1406                         goto out;
1407                 }
1408
1409                 defer_free(argp, kfree, stateid);
1410                 INIT_LIST_HEAD(&stateid->ts_id_list);
1411                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1412
1413                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1414                 if (status)
1415                         goto out;
1416         }
1417
1418         status = 0;
1419 out:
1420         return status;
1421 xdr_error:
1422         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1423         status = nfserr_bad_xdr;
1424         goto out;
1425 }
1426
1427 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1428 {
1429         DECODE_HEAD;
1430
1431         READ_BUF(8);
1432         COPYMEM(&dc->clientid, 8);
1433
1434         DECODE_TAIL;
1435 }
1436
1437 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1438 {
1439         DECODE_HEAD;
1440
1441         READ_BUF(4);
1442         READ32(rc->rca_one_fs);
1443
1444         DECODE_TAIL;
1445 }
1446
1447 static __be32
1448 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1449 {
1450         return nfs_ok;
1451 }
1452
1453 static __be32
1454 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1455 {
1456         return nfserr_notsupp;
1457 }
1458
1459 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1460
1461 static nfsd4_dec nfsd4_dec_ops[] = {
1462         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1463         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1464         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1465         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1466         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1467         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1468         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1469         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1470         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1471         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1472         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1473         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1474         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1475         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1476         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1477         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1478         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1479         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1480         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1481         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1482         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1483         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1484         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1485         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1486         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1487         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1488         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1489         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1490         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1491         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1492         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1493         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1494         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1495         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1496         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1497         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1498         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1499 };
1500
1501 static nfsd4_dec nfsd41_dec_ops[] = {
1502         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1503         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1504         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1505         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1506         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1507         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1508         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1509         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1510         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1511         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1512         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1513         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1514         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1515         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1516         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1517         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1518         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1519         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1520         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1521         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1522         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1523         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1524         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1525         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1526         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1527         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1528         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1529         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1530         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1531         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1532         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1533         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1534         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1535         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1536         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1537         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1538         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1539
1540         /* new operations for NFSv4.1 */
1541         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1542         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1543         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1544         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1545         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1546         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1547         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1548         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1549         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1550         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1551         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1552         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1553         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1554         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1555         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1556         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1557         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1558         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1559         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1560 };
1561
1562 struct nfsd4_minorversion_ops {
1563         nfsd4_dec *decoders;
1564         int nops;
1565 };
1566
1567 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1568         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1569         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1570 };
1571
1572 static __be32
1573 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1574 {
1575         DECODE_HEAD;
1576         struct nfsd4_op *op;
1577         struct nfsd4_minorversion_ops *ops;
1578         bool cachethis = false;
1579         int i;
1580
1581         READ_BUF(4);
1582         READ32(argp->taglen);
1583         READ_BUF(argp->taglen + 8);
1584         SAVEMEM(argp->tag, argp->taglen);
1585         READ32(argp->minorversion);
1586         READ32(argp->opcnt);
1587
1588         if (argp->taglen > NFSD4_MAX_TAGLEN)
1589                 goto xdr_error;
1590         if (argp->opcnt > 100)
1591                 goto xdr_error;
1592
1593         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1594                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1595                 if (!argp->ops) {
1596                         argp->ops = argp->iops;
1597                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1598                         goto xdr_error;
1599                 }
1600         }
1601
1602         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1603                 argp->opcnt = 0;
1604
1605         ops = &nfsd4_minorversion[argp->minorversion];
1606         for (i = 0; i < argp->opcnt; i++) {
1607                 op = &argp->ops[i];
1608                 op->replay = NULL;
1609
1610                 READ_BUF(4);
1611                 READ32(op->opnum);
1612
1613                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1614                         op->status = ops->decoders[op->opnum](argp, &op->u);
1615                 else {
1616                         op->opnum = OP_ILLEGAL;
1617                         op->status = nfserr_op_illegal;
1618                 }
1619
1620                 if (op->status) {
1621                         argp->opcnt = i+1;
1622                         break;
1623                 }
1624                 /*
1625                  * We'll try to cache the result in the DRC if any one
1626                  * op in the compound wants to be cached:
1627                  */
1628                 cachethis |= nfsd4_cache_this_op(op);
1629         }
1630         /* Sessions make the DRC unnecessary: */
1631         if (argp->minorversion)
1632                 cachethis = false;
1633         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1634
1635         DECODE_TAIL;
1636 }
1637
1638 #define WRITE32(n)               *p++ = htonl(n)
1639 #define WRITE64(n)               do {                           \
1640         *p++ = htonl((u32)((n) >> 32));                         \
1641         *p++ = htonl((u32)(n));                                 \
1642 } while (0)
1643 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1644         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1645         memcpy(p, ptr, nbytes);                                 \
1646         p += XDR_QUADLEN(nbytes);                               \
1647 }} while (0)
1648
1649 static void write32(__be32 **p, u32 n)
1650 {
1651         *(*p)++ = htonl(n);
1652 }
1653
1654 static void write64(__be32 **p, u64 n)
1655 {
1656         write32(p, (n >> 32));
1657         write32(p, (u32)n);
1658 }
1659
1660 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1661 {
1662         if (IS_I_VERSION(inode)) {
1663                 write64(p, inode->i_version);
1664         } else {
1665                 write32(p, stat->ctime.tv_sec);
1666                 write32(p, stat->ctime.tv_nsec);
1667         }
1668 }
1669
1670 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1671 {
1672         write32(p, c->atomic);
1673         if (c->change_supported) {
1674                 write64(p, c->before_change);
1675                 write64(p, c->after_change);
1676         } else {
1677                 write32(p, c->before_ctime_sec);
1678                 write32(p, c->before_ctime_nsec);
1679                 write32(p, c->after_ctime_sec);
1680                 write32(p, c->after_ctime_nsec);
1681         }
1682 }
1683
1684 #define RESERVE_SPACE(nbytes)   do {                            \
1685         p = resp->p;                                            \
1686         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1687 } while (0)
1688 #define ADJUST_ARGS()           resp->p = p
1689
1690 /* Encode as an array of strings the string given with components
1691  * separated @sep, escaped with esc_enter and esc_exit.
1692  */
1693 static __be32 nfsd4_encode_components_esc(char sep, char *components,
1694                                    __be32 **pp, int *buflen,
1695                                    char esc_enter, char esc_exit)
1696 {
1697         __be32 *p = *pp;
1698         __be32 *countp = p;
1699         int strlen, count=0;
1700         char *str, *end, *next;
1701
1702         dprintk("nfsd4_encode_components(%s)\n", components);
1703         if ((*buflen -= 4) < 0)
1704                 return nfserr_resource;
1705         WRITE32(0); /* We will fill this in with @count later */
1706         end = str = components;
1707         while (*end) {
1708                 bool found_esc = false;
1709
1710                 /* try to parse as esc_start, ..., esc_end, sep */
1711                 if (*str == esc_enter) {
1712                         for (; *end && (*end != esc_exit); end++)
1713                                 /* find esc_exit or end of string */;
1714                         next = end + 1;
1715                         if (*end && (!*next || *next == sep)) {
1716                                 str++;
1717                                 found_esc = true;
1718                         }
1719                 }
1720
1721                 if (!found_esc)
1722                         for (; *end && (*end != sep); end++)
1723                                 /* find sep or end of string */;
1724
1725                 strlen = end - str;
1726                 if (strlen) {
1727                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1728                                 return nfserr_resource;
1729                         WRITE32(strlen);
1730                         WRITEMEM(str, strlen);
1731                         count++;
1732                 }
1733                 else
1734                         end++;
1735                 str = end;
1736         }
1737         *pp = p;
1738         p = countp;
1739         WRITE32(count);
1740         return 0;
1741 }
1742
1743 /* Encode as an array of strings the string given with components
1744  * separated @sep.
1745  */
1746 static __be32 nfsd4_encode_components(char sep, char *components,
1747                                    __be32 **pp, int *buflen)
1748 {
1749         return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1750 }
1751
1752 /*
1753  * encode a location element of a fs_locations structure
1754  */
1755 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1756                                     __be32 **pp, int *buflen)
1757 {
1758         __be32 status;
1759         __be32 *p = *pp;
1760
1761         status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1762                                                 '[', ']');
1763         if (status)
1764                 return status;
1765         status = nfsd4_encode_components('/', location->path, &p, buflen);
1766         if (status)
1767                 return status;
1768         *pp = p;
1769         return 0;
1770 }
1771
1772 /*
1773  * Encode a path in RFC3530 'pathname4' format
1774  */
1775 static __be32 nfsd4_encode_path(const struct path *root,
1776                 const struct path *path, __be32 **pp, int *buflen)
1777 {
1778         struct path cur = {
1779                 .mnt = path->mnt,
1780                 .dentry = path->dentry,
1781         };
1782         __be32 *p = *pp;
1783         struct dentry **components = NULL;
1784         unsigned int ncomponents = 0;
1785         __be32 err = nfserr_jukebox;
1786
1787         dprintk("nfsd4_encode_components(");
1788
1789         path_get(&cur);
1790         /* First walk the path up to the nfsd root, and store the
1791          * dentries/path components in an array.
1792          */
1793         for (;;) {
1794                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1795                         break;
1796                 if (cur.dentry == cur.mnt->mnt_root) {
1797                         if (follow_up(&cur))
1798                                 continue;
1799                         goto out_free;
1800                 }
1801                 if ((ncomponents & 15) == 0) {
1802                         struct dentry **new;
1803                         new = krealloc(components,
1804                                         sizeof(*new) * (ncomponents + 16),
1805                                         GFP_KERNEL);
1806                         if (!new)
1807                                 goto out_free;
1808                         components = new;
1809                 }
1810                 components[ncomponents++] = cur.dentry;
1811                 cur.dentry = dget_parent(cur.dentry);
1812         }
1813
1814         *buflen -= 4;
1815         if (*buflen < 0)
1816                 goto out_free;
1817         WRITE32(ncomponents);
1818
1819         while (ncomponents) {
1820                 struct dentry *dentry = components[ncomponents - 1];
1821                 unsigned int len = dentry->d_name.len;
1822
1823                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1824                 if (*buflen < 0)
1825                         goto out_free;
1826                 WRITE32(len);
1827                 WRITEMEM(dentry->d_name.name, len);
1828                 dprintk("/%s", dentry->d_name.name);
1829                 dput(dentry);
1830                 ncomponents--;
1831         }
1832
1833         *pp = p;
1834         err = 0;
1835 out_free:
1836         dprintk(")\n");
1837         while (ncomponents)
1838                 dput(components[--ncomponents]);
1839         kfree(components);
1840         path_put(&cur);
1841         return err;
1842 }
1843
1844 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1845                 const struct path *path, __be32 **pp, int *buflen)
1846 {
1847         struct svc_export *exp_ps;
1848         __be32 res;
1849
1850         exp_ps = rqst_find_fsidzero_export(rqstp);
1851         if (IS_ERR(exp_ps))
1852                 return nfserrno(PTR_ERR(exp_ps));
1853         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1854         exp_put(exp_ps);
1855         return res;
1856 }
1857
1858 /*
1859  *  encode a fs_locations structure
1860  */
1861 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1862                                      struct svc_export *exp,
1863                                      __be32 **pp, int *buflen)
1864 {
1865         __be32 status;
1866         int i;
1867         __be32 *p = *pp;
1868         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1869
1870         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1871         if (status)
1872                 return status;
1873         if ((*buflen -= 4) < 0)
1874                 return nfserr_resource;
1875         WRITE32(fslocs->locations_count);
1876         for (i=0; i<fslocs->locations_count; i++) {
1877                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1878                                                    &p, buflen);
1879                 if (status)
1880                         return status;
1881         }
1882         *pp = p;
1883         return 0;
1884 }
1885
1886 static u32 nfs4_file_type(umode_t mode)
1887 {
1888         switch (mode & S_IFMT) {
1889         case S_IFIFO:   return NF4FIFO;
1890         case S_IFCHR:   return NF4CHR;
1891         case S_IFDIR:   return NF4DIR;
1892         case S_IFBLK:   return NF4BLK;
1893         case S_IFLNK:   return NF4LNK;
1894         case S_IFREG:   return NF4REG;
1895         case S_IFSOCK:  return NF4SOCK;
1896         default:        return NF4BAD;
1897         };
1898 }
1899
1900 static __be32
1901 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, kuid_t uid, kgid_t gid,
1902                         __be32 **p, int *buflen)
1903 {
1904         int status;
1905
1906         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1907                 return nfserr_resource;
1908         if (whotype != NFS4_ACL_WHO_NAMED)
1909                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1910         else if (gid_valid(gid))
1911                 status = nfsd_map_gid_to_name(rqstp, gid, (u8 *)(*p + 1));
1912         else
1913                 status = nfsd_map_uid_to_name(rqstp, uid, (u8 *)(*p + 1));
1914         if (status < 0)
1915                 return nfserrno(status);
1916         *p = xdr_encode_opaque(*p, NULL, status);
1917         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1918         BUG_ON(*buflen < 0);
1919         return 0;
1920 }
1921
1922 static inline __be32
1923 nfsd4_encode_user(struct svc_rqst *rqstp, kuid_t user, __be32 **p, int *buflen)
1924 {
1925         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, user, INVALID_GID,
1926                                  p, buflen);
1927 }
1928
1929 static inline __be32
1930 nfsd4_encode_group(struct svc_rqst *rqstp, kgid_t group, __be32 **p, int *buflen)
1931 {
1932         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, INVALID_UID, group,
1933                                  p, buflen);
1934 }
1935
1936 static inline __be32
1937 nfsd4_encode_aclname(struct svc_rqst *rqstp, struct nfs4_ace *ace,
1938                 __be32 **p, int *buflen)
1939 {
1940         kuid_t uid = INVALID_UID;
1941         kgid_t gid = INVALID_GID;
1942
1943         if (ace->whotype == NFS4_ACL_WHO_NAMED) {
1944                 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1945                         gid = ace->who_gid;
1946                 else
1947                         uid = ace->who_uid;
1948         }
1949         return nfsd4_encode_name(rqstp, ace->whotype, uid, gid, p, buflen);
1950 }
1951
1952 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1953                               FATTR4_WORD0_RDATTR_ERROR)
1954 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1955
1956 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1957 {
1958         /* As per referral draft:  */
1959         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1960             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1961                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1962                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1963                         *rdattr_err = NFSERR_MOVED;
1964                 else
1965                         return nfserr_moved;
1966         }
1967         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1968         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1969         return 0;
1970 }
1971
1972
1973 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
1974 {
1975         struct path path = exp->ex_path;
1976         int err;
1977
1978         path_get(&path);
1979         while (follow_up(&path)) {
1980                 if (path.dentry != path.mnt->mnt_root)
1981                         break;
1982         }
1983         err = vfs_getattr(&path, stat);
1984         path_put(&path);
1985         return err;
1986 }
1987
1988 /*
1989  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1990  * ourselves.
1991  *
1992  * countp is the buffer size in _words_
1993  */
1994 __be32
1995 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1996                 struct dentry *dentry, __be32 **buffer, int count, u32 *bmval,
1997                 struct svc_rqst *rqstp, int ignore_crossmnt)
1998 {
1999         u32 bmval0 = bmval[0];
2000         u32 bmval1 = bmval[1];
2001         u32 bmval2 = bmval[2];
2002         struct kstat stat;
2003         struct svc_fh tempfh;
2004         struct kstatfs statfs;
2005         int buflen = count << 2;
2006         __be32 *attrlenp;
2007         u32 dummy;
2008         u64 dummy64;
2009         u32 rdattr_err = 0;
2010         __be32 *p = *buffer;
2011         __be32 status;
2012         int err;
2013         int aclsupport = 0;
2014         struct nfs4_acl *acl = NULL;
2015         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2016         u32 minorversion = resp->cstate.minorversion;
2017         struct path path = {
2018                 .mnt    = exp->ex_path.mnt,
2019                 .dentry = dentry,
2020         };
2021         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2022
2023         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2024         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2025         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2026         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2027
2028         if (exp->ex_fslocs.migrated) {
2029                 BUG_ON(bmval[2]);
2030                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2031                 if (status)
2032                         goto out;
2033         }
2034
2035         err = vfs_getattr(&path, &stat);
2036         if (err)
2037                 goto out_nfserr;
2038         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2039                         FATTR4_WORD0_MAXNAME)) ||
2040             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2041                        FATTR4_WORD1_SPACE_TOTAL))) {
2042                 err = vfs_statfs(&path, &statfs);
2043                 if (err)
2044                         goto out_nfserr;
2045         }
2046         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2047                 fh_init(&tempfh, NFS4_FHSIZE);
2048                 status = fh_compose(&tempfh, exp, dentry, NULL);
2049                 if (status)
2050                         goto out;
2051                 fhp = &tempfh;
2052         }
2053         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2054                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2055                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2056                 aclsupport = (err == 0);
2057                 if (bmval0 & FATTR4_WORD0_ACL) {
2058                         if (err == -EOPNOTSUPP)
2059                                 bmval0 &= ~FATTR4_WORD0_ACL;
2060                         else if (err == -EINVAL) {
2061                                 status = nfserr_attrnotsupp;
2062                                 goto out;
2063                         } else if (err != 0)
2064                                 goto out_nfserr;
2065                 }
2066         }
2067
2068         if (bmval2) {
2069                 if ((buflen -= 16) < 0)
2070                         goto out_resource;
2071                 WRITE32(3);
2072                 WRITE32(bmval0);
2073                 WRITE32(bmval1);
2074                 WRITE32(bmval2);
2075         } else if (bmval1) {
2076                 if ((buflen -= 12) < 0)
2077                         goto out_resource;
2078                 WRITE32(2);
2079                 WRITE32(bmval0);
2080                 WRITE32(bmval1);
2081         } else {
2082                 if ((buflen -= 8) < 0)
2083                         goto out_resource;
2084                 WRITE32(1);
2085                 WRITE32(bmval0);
2086         }
2087         attrlenp = p++;                /* to be backfilled later */
2088
2089         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2090                 u32 word0 = nfsd_suppattrs0(minorversion);
2091                 u32 word1 = nfsd_suppattrs1(minorversion);
2092                 u32 word2 = nfsd_suppattrs2(minorversion);
2093
2094                 if (!aclsupport)
2095                         word0 &= ~FATTR4_WORD0_ACL;
2096                 if (!word2) {
2097                         if ((buflen -= 12) < 0)
2098                                 goto out_resource;
2099                         WRITE32(2);
2100                         WRITE32(word0);
2101                         WRITE32(word1);
2102                 } else {
2103                         if ((buflen -= 16) < 0)
2104                                 goto out_resource;
2105                         WRITE32(3);
2106                         WRITE32(word0);
2107                         WRITE32(word1);
2108                         WRITE32(word2);
2109                 }
2110         }
2111         if (bmval0 & FATTR4_WORD0_TYPE) {
2112                 if ((buflen -= 4) < 0)
2113                         goto out_resource;
2114                 dummy = nfs4_file_type(stat.mode);
2115                 if (dummy == NF4BAD)
2116                         goto out_serverfault;
2117                 WRITE32(dummy);
2118         }
2119         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2120                 if ((buflen -= 4) < 0)
2121                         goto out_resource;
2122                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2123                         WRITE32(NFS4_FH_PERSISTENT);
2124                 else
2125                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2126         }
2127         if (bmval0 & FATTR4_WORD0_CHANGE) {
2128                 if ((buflen -= 8) < 0)
2129                         goto out_resource;
2130                 write_change(&p, &stat, dentry->d_inode);
2131         }
2132         if (bmval0 & FATTR4_WORD0_SIZE) {
2133                 if ((buflen -= 8) < 0)
2134                         goto out_resource;
2135                 WRITE64(stat.size);
2136         }
2137         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2138                 if ((buflen -= 4) < 0)
2139                         goto out_resource;
2140                 WRITE32(1);
2141         }
2142         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2143                 if ((buflen -= 4) < 0)
2144                         goto out_resource;
2145                 WRITE32(1);
2146         }
2147         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2148                 if ((buflen -= 4) < 0)
2149                         goto out_resource;
2150                 WRITE32(0);
2151         }
2152         if (bmval0 & FATTR4_WORD0_FSID) {
2153                 if ((buflen -= 16) < 0)
2154                         goto out_resource;
2155                 if (exp->ex_fslocs.migrated) {
2156                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2157                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2158                 } else switch(fsid_source(fhp)) {
2159                 case FSIDSOURCE_FSID:
2160                         WRITE64((u64)exp->ex_fsid);
2161                         WRITE64((u64)0);
2162                         break;
2163                 case FSIDSOURCE_DEV:
2164                         WRITE32(0);
2165                         WRITE32(MAJOR(stat.dev));
2166                         WRITE32(0);
2167                         WRITE32(MINOR(stat.dev));
2168                         break;
2169                 case FSIDSOURCE_UUID:
2170                         WRITEMEM(exp->ex_uuid, 16);
2171                         break;
2172                 }
2173         }
2174         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2175                 if ((buflen -= 4) < 0)
2176                         goto out_resource;
2177                 WRITE32(0);
2178         }
2179         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2180                 if ((buflen -= 4) < 0)
2181                         goto out_resource;
2182                 WRITE32(nn->nfsd4_lease);
2183         }
2184         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2185                 if ((buflen -= 4) < 0)
2186                         goto out_resource;
2187                 WRITE32(rdattr_err);
2188         }
2189         if (bmval0 & FATTR4_WORD0_ACL) {
2190                 struct nfs4_ace *ace;
2191
2192                 if (acl == NULL) {
2193                         if ((buflen -= 4) < 0)
2194                                 goto out_resource;
2195
2196                         WRITE32(0);
2197                         goto out_acl;
2198                 }
2199                 if ((buflen -= 4) < 0)
2200                         goto out_resource;
2201                 WRITE32(acl->naces);
2202
2203                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2204                         if ((buflen -= 4*3) < 0)
2205                                 goto out_resource;
2206                         WRITE32(ace->type);
2207                         WRITE32(ace->flag);
2208                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2209                         status = nfsd4_encode_aclname(rqstp, ace, &p, &buflen);
2210                         if (status == nfserr_resource)
2211                                 goto out_resource;
2212                         if (status)
2213                                 goto out;
2214                 }
2215         }
2216 out_acl:
2217         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2218                 if ((buflen -= 4) < 0)
2219                         goto out_resource;
2220                 WRITE32(aclsupport ?
2221                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2222         }
2223         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2224                 if ((buflen -= 4) < 0)
2225                         goto out_resource;
2226                 WRITE32(1);
2227         }
2228         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2229                 if ((buflen -= 4) < 0)
2230                         goto out_resource;
2231                 WRITE32(0);
2232         }
2233         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2234                 if ((buflen -= 4) < 0)
2235                         goto out_resource;
2236                 WRITE32(1);
2237         }
2238         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2239                 if ((buflen -= 4) < 0)
2240                         goto out_resource;
2241                 WRITE32(1);
2242         }
2243         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2244                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2245                 if (buflen < 0)
2246                         goto out_resource;
2247                 WRITE32(fhp->fh_handle.fh_size);
2248                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2249         }
2250         if (bmval0 & FATTR4_WORD0_FILEID) {
2251                 if ((buflen -= 8) < 0)
2252                         goto out_resource;
2253                 WRITE64(stat.ino);
2254         }
2255         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2256                 if ((buflen -= 8) < 0)
2257                         goto out_resource;
2258                 WRITE64((u64) statfs.f_ffree);
2259         }
2260         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2261                 if ((buflen -= 8) < 0)
2262                         goto out_resource;
2263                 WRITE64((u64) statfs.f_ffree);
2264         }
2265         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2266                 if ((buflen -= 8) < 0)
2267                         goto out_resource;
2268                 WRITE64((u64) statfs.f_files);
2269         }
2270         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2271                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2272                 if (status == nfserr_resource)
2273                         goto out_resource;
2274                 if (status)
2275                         goto out;
2276         }
2277         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2278                 if ((buflen -= 4) < 0)
2279                         goto out_resource;
2280                 WRITE32(1);
2281         }
2282         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2283                 if ((buflen -= 8) < 0)
2284                         goto out_resource;
2285                 WRITE64(~(u64)0);
2286         }
2287         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2288                 if ((buflen -= 4) < 0)
2289                         goto out_resource;
2290                 WRITE32(255);
2291         }
2292         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2293                 if ((buflen -= 4) < 0)
2294                         goto out_resource;
2295                 WRITE32(statfs.f_namelen);
2296         }
2297         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2298                 if ((buflen -= 8) < 0)
2299                         goto out_resource;
2300                 WRITE64((u64) svc_max_payload(rqstp));
2301         }
2302         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2303                 if ((buflen -= 8) < 0)
2304                         goto out_resource;
2305                 WRITE64((u64) svc_max_payload(rqstp));
2306         }
2307         if (bmval1 & FATTR4_WORD1_MODE) {
2308                 if ((buflen -= 4) < 0)
2309                         goto out_resource;
2310                 WRITE32(stat.mode & S_IALLUGO);
2311         }
2312         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2313                 if ((buflen -= 4) < 0)
2314                         goto out_resource;
2315                 WRITE32(1);
2316         }
2317         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2318                 if ((buflen -= 4) < 0)
2319                         goto out_resource;
2320                 WRITE32(stat.nlink);
2321         }
2322         if (bmval1 & FATTR4_WORD1_OWNER) {
2323                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2324                 if (status == nfserr_resource)
2325                         goto out_resource;
2326                 if (status)
2327                         goto out;
2328         }
2329         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2330                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2331                 if (status == nfserr_resource)
2332                         goto out_resource;
2333                 if (status)
2334                         goto out;
2335         }
2336         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2337                 if ((buflen -= 8) < 0)
2338                         goto out_resource;
2339                 WRITE32((u32) MAJOR(stat.rdev));
2340                 WRITE32((u32) MINOR(stat.rdev));
2341         }
2342         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2343                 if ((buflen -= 8) < 0)
2344                         goto out_resource;
2345                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2346                 WRITE64(dummy64);
2347         }
2348         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2349                 if ((buflen -= 8) < 0)
2350                         goto out_resource;
2351                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2352                 WRITE64(dummy64);
2353         }
2354         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2355                 if ((buflen -= 8) < 0)
2356                         goto out_resource;
2357                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2358                 WRITE64(dummy64);
2359         }
2360         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2361                 if ((buflen -= 8) < 0)
2362                         goto out_resource;
2363                 dummy64 = (u64)stat.blocks << 9;
2364                 WRITE64(dummy64);
2365         }
2366         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2367                 if ((buflen -= 12) < 0)
2368                         goto out_resource;
2369                 WRITE64((s64)stat.atime.tv_sec);
2370                 WRITE32(stat.atime.tv_nsec);
2371         }
2372         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2373                 if ((buflen -= 12) < 0)
2374                         goto out_resource;
2375                 WRITE32(0);
2376                 WRITE32(1);
2377                 WRITE32(0);
2378         }
2379         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2380                 if ((buflen -= 12) < 0)
2381                         goto out_resource;
2382                 WRITE64((s64)stat.ctime.tv_sec);
2383                 WRITE32(stat.ctime.tv_nsec);
2384         }
2385         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2386                 if ((buflen -= 12) < 0)
2387                         goto out_resource;
2388                 WRITE64((s64)stat.mtime.tv_sec);
2389                 WRITE32(stat.mtime.tv_nsec);
2390         }
2391         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2392                 if ((buflen -= 8) < 0)
2393                         goto out_resource;
2394                 /*
2395                  * Get parent's attributes if not ignoring crossmount
2396                  * and this is the root of a cross-mounted filesystem.
2397                  */
2398                 if (ignore_crossmnt == 0 &&
2399                     dentry == exp->ex_path.mnt->mnt_root)
2400                         get_parent_attributes(exp, &stat);
2401                 WRITE64(stat.ino);
2402         }
2403         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2404                 if ((buflen -= 16) < 0)
2405                         goto out_resource;
2406                 WRITE32(3);
2407                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2408                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2409                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2410         }
2411
2412         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2413         *buffer = p;
2414         status = nfs_ok;
2415
2416 out:
2417         kfree(acl);
2418         if (fhp == &tempfh)
2419                 fh_put(&tempfh);
2420         return status;
2421 out_nfserr:
2422         status = nfserrno(err);
2423         goto out;
2424 out_resource:
2425         status = nfserr_resource;
2426         goto out;
2427 out_serverfault:
2428         status = nfserr_serverfault;
2429         goto out;
2430 }
2431
2432 static inline int attributes_need_mount(u32 *bmval)
2433 {
2434         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2435                 return 1;
2436         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2437                 return 1;
2438         return 0;
2439 }
2440
2441 static __be32
2442 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2443                 const char *name, int namlen, __be32 **p, int buflen)
2444 {
2445         struct svc_export *exp = cd->rd_fhp->fh_export;
2446         struct dentry *dentry;
2447         __be32 nfserr;
2448         int ignore_crossmnt = 0;
2449
2450         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2451         if (IS_ERR(dentry))
2452                 return nfserrno(PTR_ERR(dentry));
2453         if (!dentry->d_inode) {
2454                 /*
2455                  * nfsd_buffered_readdir drops the i_mutex between
2456                  * readdir and calling this callback, leaving a window
2457                  * where this directory entry could have gone away.
2458                  */
2459                 dput(dentry);
2460                 return nfserr_noent;
2461         }
2462
2463         exp_get(exp);
2464         /*
2465          * In the case of a mountpoint, the client may be asking for
2466          * attributes that are only properties of the underlying filesystem
2467          * as opposed to the cross-mounted file system. In such a case,
2468          * we will not follow the cross mount and will fill the attribtutes
2469          * directly from the mountpoint dentry.
2470          */
2471         if (nfsd_mountpoint(dentry, exp)) {
2472                 int err;
2473
2474                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2475                                 && !attributes_need_mount(cd->rd_bmval)) {
2476                         ignore_crossmnt = 1;
2477                         goto out_encode;
2478                 }
2479                 /*
2480                  * Why the heck aren't we just using nfsd_lookup??
2481                  * Different "."/".." handling?  Something else?
2482                  * At least, add a comment here to explain....
2483                  */
2484                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2485                 if (err) {
2486                         nfserr = nfserrno(err);
2487                         goto out_put;
2488                 }
2489                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2490                 if (nfserr)
2491                         goto out_put;
2492
2493         }
2494 out_encode:
2495         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2496                                         cd->rd_rqstp, ignore_crossmnt);
2497 out_put:
2498         dput(dentry);
2499         exp_put(exp);
2500         return nfserr;
2501 }
2502
2503 static __be32 *
2504 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2505 {
2506         __be32 *attrlenp;
2507
2508         if (buflen < 6)
2509                 return NULL;
2510         *p++ = htonl(2);
2511         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2512         *p++ = htonl(0);                         /* bmval1 */
2513
2514         attrlenp = p++;
2515         *p++ = nfserr;       /* no htonl */
2516         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2517         return p;
2518 }
2519
2520 static int
2521 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2522                     loff_t offset, u64 ino, unsigned int d_type)
2523 {
2524         struct readdir_cd *ccd = ccdv;
2525         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2526         int buflen;
2527         __be32 *p = cd->buffer;
2528         __be32 *cookiep;
2529         __be32 nfserr = nfserr_toosmall;
2530
2531         /* In nfsv4, "." and ".." never make it onto the wire.. */
2532         if (name && isdotent(name, namlen)) {
2533                 cd->common.err = nfs_ok;
2534                 return 0;
2535         }
2536
2537         if (cd->offset)
2538                 xdr_encode_hyper(cd->offset, (u64) offset);
2539
2540         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2541         if (buflen < 0)
2542                 goto fail;
2543
2544         *p++ = xdr_one;                             /* mark entry present */
2545         cookiep = p;
2546         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2547         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2548
2549         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
2550         switch (nfserr) {
2551         case nfs_ok:
2552                 break;
2553         case nfserr_resource:
2554                 nfserr = nfserr_toosmall;
2555                 goto fail;
2556         case nfserr_noent:
2557                 goto skip_entry;
2558         default:
2559                 /*
2560                  * If the client requested the RDATTR_ERROR attribute,
2561                  * we stuff the error code into this attribute
2562                  * and continue.  If this attribute was not requested,
2563                  * then in accordance with the spec, we fail the
2564                  * entire READDIR operation(!)
2565                  */
2566                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2567                         goto fail;
2568                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2569                 if (p == NULL) {
2570                         nfserr = nfserr_toosmall;
2571                         goto fail;
2572                 }
2573         }
2574         cd->buflen -= (p - cd->buffer);
2575         cd->buffer = p;
2576         cd->offset = cookiep;
2577 skip_entry:
2578         cd->common.err = nfs_ok;
2579         return 0;
2580 fail:
2581         cd->common.err = nfserr;
2582         return -EINVAL;
2583 }
2584
2585 static void
2586 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2587 {
2588         __be32 *p;
2589
2590         RESERVE_SPACE(sizeof(stateid_t));
2591         WRITE32(sid->si_generation);
2592         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2593         ADJUST_ARGS();
2594 }
2595
2596 static __be32
2597 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2598 {
2599         __be32 *p;
2600
2601         if (!nfserr) {
2602                 RESERVE_SPACE(8);
2603                 WRITE32(access->ac_supported);
2604                 WRITE32(access->ac_resp_access);
2605                 ADJUST_ARGS();
2606         }
2607         return nfserr;
2608 }
2609
2610 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2611 {
2612         __be32 *p;
2613
2614         if (!nfserr) {
2615                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2616                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2617                 WRITE32(bcts->dir);
2618                 /* Sorry, we do not yet support RDMA over 4.1: */
2619                 WRITE32(0);
2620                 ADJUST_ARGS();
2621         }
2622         return nfserr;
2623 }
2624
2625 static __be32
2626 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2627 {
2628         if (!nfserr)
2629                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2630
2631         return nfserr;
2632 }
2633
2634
2635 static __be32
2636 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2637 {
2638         __be32 *p;
2639
2640         if (!nfserr) {
2641                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2642                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2643                 ADJUST_ARGS();
2644         }
2645         return nfserr;
2646 }
2647
2648 static __be32
2649 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2650 {
2651         __be32 *p;
2652
2653         if (!nfserr) {
2654                 RESERVE_SPACE(32);
2655                 write_cinfo(&p, &create->cr_cinfo);
2656                 WRITE32(2);
2657                 WRITE32(create->cr_bmval[0]);
2658                 WRITE32(create->cr_bmval[1]);
2659                 ADJUST_ARGS();
2660         }
2661         return nfserr;
2662 }
2663
2664 static __be32
2665 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2666 {
2667         struct svc_fh *fhp = getattr->ga_fhp;
2668         int buflen;
2669
2670         if (nfserr)
2671                 return nfserr;
2672
2673         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2674         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2675                                     &resp->p, buflen, getattr->ga_bmval,
2676                                     resp->rqstp, 0);
2677         return nfserr;
2678 }
2679
2680 static __be32
2681 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2682 {
2683         struct svc_fh *fhp = *fhpp;
2684         unsigned int len;
2685         __be32 *p;
2686
2687         if (!nfserr) {
2688                 len = fhp->fh_handle.fh_size;
2689                 RESERVE_SPACE(len + 4);
2690                 WRITE32(len);
2691                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2692                 ADJUST_ARGS();
2693         }
2694         return nfserr;
2695 }
2696
2697 /*
2698 * Including all fields other than the name, a LOCK4denied structure requires
2699 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2700 */
2701 static void
2702 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2703 {
2704         struct xdr_netobj *conf = &ld->ld_owner;
2705         __be32 *p;
2706
2707         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2708         WRITE64(ld->ld_start);
2709         WRITE64(ld->ld_length);
2710         WRITE32(ld->ld_type);
2711         if (conf->len) {
2712                 WRITEMEM(&ld->ld_clientid, 8);
2713                 WRITE32(conf->len);
2714                 WRITEMEM(conf->data, conf->len);
2715                 kfree(conf->data);
2716         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2717                 WRITE64((u64)0); /* clientid */
2718                 WRITE32(0); /* length of owner name */
2719         }
2720         ADJUST_ARGS();
2721 }
2722
2723 static __be32
2724 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2725 {
2726         if (!nfserr)
2727                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2728         else if (nfserr == nfserr_denied)
2729                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2730
2731         return nfserr;
2732 }
2733
2734 static __be32
2735 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2736 {
2737         if (nfserr == nfserr_denied)
2738                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2739         return nfserr;
2740 }
2741
2742 static __be32
2743 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2744 {
2745         if (!nfserr)
2746                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2747
2748         return nfserr;
2749 }
2750
2751
2752 static __be32
2753 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2754 {
2755         __be32 *p;
2756
2757         if (!nfserr) {
2758                 RESERVE_SPACE(20);
2759                 write_cinfo(&p, &link->li_cinfo);
2760                 ADJUST_ARGS();
2761         }
2762         return nfserr;
2763 }
2764
2765
2766 static __be32
2767 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2768 {
2769         __be32 *p;
2770
2771         if (nfserr)
2772                 goto out;
2773
2774         nfsd4_encode_stateid(resp, &open->op_stateid);
2775         RESERVE_SPACE(40);
2776         write_cinfo(&p, &open->op_cinfo);
2777         WRITE32(open->op_rflags);
2778         WRITE32(2);
2779         WRITE32(open->op_bmval[0]);
2780         WRITE32(open->op_bmval[1]);
2781         WRITE32(open->op_delegate_type);
2782         ADJUST_ARGS();
2783
2784         switch (open->op_delegate_type) {
2785         case NFS4_OPEN_DELEGATE_NONE:
2786                 break;
2787         case NFS4_OPEN_DELEGATE_READ:
2788                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2789                 RESERVE_SPACE(20);
2790                 WRITE32(open->op_recall);
2791
2792                 /*
2793                  * TODO: ACE's in delegations
2794                  */
2795                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2796                 WRITE32(0);
2797                 WRITE32(0);
2798                 WRITE32(0);   /* XXX: is NULL principal ok? */
2799                 ADJUST_ARGS();
2800                 break;
2801         case NFS4_OPEN_DELEGATE_WRITE:
2802                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2803                 RESERVE_SPACE(32);
2804                 WRITE32(0);
2805
2806                 /*
2807                  * TODO: space_limit's in delegations
2808                  */
2809                 WRITE32(NFS4_LIMIT_SIZE);
2810                 WRITE32(~(u32)0);
2811                 WRITE32(~(u32)0);
2812
2813                 /*
2814                  * TODO: ACE's in delegations
2815                  */
2816                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2817                 WRITE32(0);
2818                 WRITE32(0);
2819                 WRITE32(0);   /* XXX: is NULL principal ok? */
2820                 ADJUST_ARGS();
2821                 break;
2822         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2823                 switch (open->op_why_no_deleg) {
2824                 case WND4_CONTENTION:
2825                 case WND4_RESOURCE:
2826                         RESERVE_SPACE(8);
2827                         WRITE32(open->op_why_no_deleg);
2828                         WRITE32(0);     /* deleg signaling not supported yet */
2829                         break;
2830                 default:
2831                         RESERVE_SPACE(4);
2832                         WRITE32(open->op_why_no_deleg);
2833                 }
2834                 ADJUST_ARGS();
2835                 break;
2836         default:
2837                 BUG();
2838         }
2839         /* XXX save filehandle here */
2840 out:
2841         return nfserr;
2842 }
2843
2844 static __be32
2845 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2846 {
2847         if (!nfserr)
2848                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2849
2850         return nfserr;
2851 }
2852
2853 static __be32
2854 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2855 {
2856         if (!nfserr)
2857                 nfsd4_encode_stateid(resp, &od->od_stateid);
2858
2859         return nfserr;
2860 }
2861
2862 static __be32
2863 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2864                   struct nfsd4_read *read)
2865 {
2866         u32 eof;
2867         int v;
2868         struct page *page;
2869         unsigned long maxcount;
2870         long len;
2871         __be32 *p;
2872
2873         if (nfserr)
2874                 return nfserr;
2875         if (resp->xbuf->page_len)
2876                 return nfserr_resource;
2877
2878         RESERVE_SPACE(8); /* eof flag and byte count */
2879
2880         maxcount = svc_max_payload(resp->rqstp);
2881         if (maxcount > read->rd_length)
2882                 maxcount = read->rd_length;
2883
2884         len = maxcount;
2885         v = 0;
2886         while (len > 0) {
2887                 page = *(resp->rqstp->rq_next_page);
2888                 if (!page) { /* ran out of pages */
2889                         maxcount -= len;
2890                         break;
2891                 }
2892                 resp->rqstp->rq_vec[v].iov_base = page_address(page);
2893                 resp->rqstp->rq_vec[v].iov_len =
2894                         len < PAGE_SIZE ? len : PAGE_SIZE;
2895                 resp->rqstp->rq_next_page++;
2896                 v++;
2897                 len -= PAGE_SIZE;
2898         }
2899         read->rd_vlen = v;
2900
2901         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2902                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2903                         &maxcount);
2904
2905         if (nfserr)
2906                 return nfserr;
2907         eof = (read->rd_offset + maxcount >=
2908                read->rd_fhp->fh_dentry->d_inode->i_size);
2909
2910         WRITE32(eof);
2911         WRITE32(maxcount);
2912         ADJUST_ARGS();
2913         resp->xbuf->head[0].iov_len = (char*)p
2914                                         - (char*)resp->xbuf->head[0].iov_base;
2915         resp->xbuf->page_len = maxcount;
2916
2917         /* Use rest of head for padding and remaining ops: */
2918         resp->xbuf->tail[0].iov_base = p;
2919         resp->xbuf->tail[0].iov_len = 0;
2920         if (maxcount&3) {
2921                 RESERVE_SPACE(4);
2922                 WRITE32(0);
2923                 resp->xbuf->tail[0].iov_base += maxcount&3;
2924                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2925                 ADJUST_ARGS();
2926         }
2927         return 0;
2928 }
2929
2930 static __be32
2931 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2932 {
2933         int maxcount;
2934         char *page;
2935         __be32 *p;
2936
2937         if (nfserr)
2938                 return nfserr;
2939         if (resp->xbuf->page_len)
2940                 return nfserr_resource;
2941         if (!*resp->rqstp->rq_next_page)
2942                 return nfserr_resource;
2943
2944         page = page_address(*(resp->rqstp->rq_next_page++));
2945
2946         maxcount = PAGE_SIZE;
2947         RESERVE_SPACE(4);
2948
2949         /*
2950          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2951          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2952          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2953          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2954          */
2955         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2956         if (nfserr == nfserr_isdir)
2957                 return nfserr_inval;
2958         if (nfserr)
2959                 return nfserr;
2960
2961         WRITE32(maxcount);
2962         ADJUST_ARGS();
2963         resp->xbuf->head[0].iov_len = (char*)p
2964                                 - (char*)resp->xbuf->head[0].iov_base;
2965         resp->xbuf->page_len = maxcount;
2966
2967         /* Use rest of head for padding and remaining ops: */
2968         resp->xbuf->tail[0].iov_base = p;
2969         resp->xbuf->tail[0].iov_len = 0;
2970         if (maxcount&3) {
2971                 RESERVE_SPACE(4);
2972                 WRITE32(0);
2973                 resp->xbuf->tail[0].iov_base += maxcount&3;
2974                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2975                 ADJUST_ARGS();
2976         }
2977         return 0;
2978 }
2979
2980 static __be32
2981 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2982 {
2983         int maxcount;
2984         loff_t offset;
2985         __be32 *page, *savep, *tailbase;
2986         __be32 *p;
2987
2988         if (nfserr)
2989                 return nfserr;
2990         if (resp->xbuf->page_len)
2991                 return nfserr_resource;
2992         if (!*resp->rqstp->rq_next_page)
2993                 return nfserr_resource;
2994
2995         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2996         savep = p;
2997
2998         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2999         WRITE32(0);
3000         WRITE32(0);
3001         ADJUST_ARGS();
3002         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3003         tailbase = p;
3004
3005         maxcount = PAGE_SIZE;
3006         if (maxcount > readdir->rd_maxcount)
3007                 maxcount = readdir->rd_maxcount;
3008
3009         /*
3010          * Convert from bytes to words, account for the two words already
3011          * written, make sure to leave two words at the end for the next
3012          * pointer and eof field.
3013          */
3014         maxcount = (maxcount >> 2) - 4;
3015         if (maxcount < 0) {
3016                 nfserr =  nfserr_toosmall;
3017                 goto err_no_verf;
3018         }
3019
3020         page = page_address(*(resp->rqstp->rq_next_page++));
3021         readdir->common.err = 0;
3022         readdir->buflen = maxcount;
3023         readdir->buffer = page;
3024         readdir->offset = NULL;
3025
3026         offset = readdir->rd_cookie;
3027         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3028                               &offset,
3029                               &readdir->common, nfsd4_encode_dirent);
3030         if (nfserr == nfs_ok &&
3031             readdir->common.err == nfserr_toosmall &&
3032             readdir->buffer == page)
3033                 nfserr = nfserr_toosmall;
3034         if (nfserr)
3035                 goto err_no_verf;
3036
3037         if (readdir->offset)
3038                 xdr_encode_hyper(readdir->offset, offset);
3039
3040         p = readdir->buffer;
3041         *p++ = 0;       /* no more entries */
3042         *p++ = htonl(readdir->common.err == nfserr_eof);
3043         resp->xbuf->page_len = ((char*)p) -
3044                 (char*)page_address(*(resp->rqstp->rq_next_page-1));
3045
3046         /* Use rest of head for padding and remaining ops: */
3047         resp->xbuf->tail[0].iov_base = tailbase;
3048         resp->xbuf->tail[0].iov_len = 0;
3049         resp->p = resp->xbuf->tail[0].iov_base;
3050         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3051
3052         return 0;
3053 err_no_verf:
3054         p = savep;
3055         ADJUST_ARGS();
3056         return nfserr;
3057 }
3058
3059 static __be32
3060 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3061 {
3062         __be32 *p;
3063
3064         if (!nfserr) {
3065                 RESERVE_SPACE(20);
3066                 write_cinfo(&p, &remove->rm_cinfo);
3067                 ADJUST_ARGS();
3068         }
3069         return nfserr;
3070 }
3071
3072 static __be32
3073 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3074 {
3075         __be32 *p;
3076
3077         if (!nfserr) {
3078                 RESERVE_SPACE(40);
3079                 write_cinfo(&p, &rename->rn_sinfo);
3080                 write_cinfo(&p, &rename->rn_tinfo);
3081                 ADJUST_ARGS();
3082         }
3083         return nfserr;
3084 }
3085
3086 static __be32
3087 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3088                          __be32 nfserr, struct svc_export *exp)
3089 {
3090         u32 i, nflavs, supported;
3091         struct exp_flavor_info *flavs;
3092         struct exp_flavor_info def_flavs[2];
3093         __be32 *p, *flavorsp;
3094         static bool report = true;
3095
3096         if (nfserr)
3097                 goto out;
3098         if (exp->ex_nflavors) {
3099                 flavs = exp->ex_flavors;
3100                 nflavs = exp->ex_nflavors;
3101         } else { /* Handling of some defaults in absence of real secinfo: */
3102                 flavs = def_flavs;
3103                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3104                         nflavs = 2;
3105                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3106                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3107                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3108                         nflavs = 1;
3109                         flavs[0].pseudoflavor
3110                                         = svcauth_gss_flavor(exp->ex_client);
3111                 } else {
3112                         nflavs = 1;
3113                         flavs[0].pseudoflavor
3114                                         = exp->ex_client->flavour->flavour;
3115                 }
3116         }
3117
3118         supported = 0;
3119         RESERVE_SPACE(4);
3120         flavorsp = p++;         /* to be backfilled later */
3121         ADJUST_ARGS();
3122
3123         for (i = 0; i < nflavs; i++) {
3124                 rpc_authflavor_t pf = flavs[i].pseudoflavor;
3125                 struct rpcsec_gss_info info;
3126
3127                 if (rpcauth_get_gssinfo(pf, &info) == 0) {
3128                         supported++;
3129                         RESERVE_SPACE(4 + 4 + info.oid.len + 4 + 4);
3130                         WRITE32(RPC_AUTH_GSS);
3131                         WRITE32(info.oid.len);
3132                         WRITEMEM(info.oid.data, info.oid.len);
3133                         WRITE32(info.qop);
3134                         WRITE32(info.service);
3135                         ADJUST_ARGS();
3136                 } else if (pf < RPC_AUTH_MAXFLAVOR) {
3137                         supported++;
3138                         RESERVE_SPACE(4);
3139                         WRITE32(pf);
3140                         ADJUST_ARGS();
3141                 } else {
3142                         if (report)
3143                                 pr_warn("NFS: SECINFO: security flavor %u "
3144                                         "is not supported\n", pf);
3145                 }
3146         }
3147
3148         if (nflavs != supported)
3149                 report = false;
3150         *flavorsp = htonl(supported);
3151
3152 out:
3153         if (exp)
3154                 exp_put(exp);
3155         return nfserr;
3156 }
3157
3158 static __be32
3159 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3160                      struct nfsd4_secinfo *secinfo)
3161 {
3162         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3163 }
3164
3165 static __be32
3166 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3167                      struct nfsd4_secinfo_no_name *secinfo)
3168 {
3169         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3170 }
3171
3172 /*
3173  * The SETATTR encode routine is special -- it always encodes a bitmap,
3174  * regardless of the error status.
3175  */
3176 static __be32
3177 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3178 {
3179         __be32 *p;
3180
3181         RESERVE_SPACE(12);
3182         if (nfserr) {
3183                 WRITE32(2);
3184                 WRITE32(0);
3185                 WRITE32(0);
3186         }
3187         else {
3188                 WRITE32(2);
3189                 WRITE32(setattr->sa_bmval[0]);
3190                 WRITE32(setattr->sa_bmval[1]);
3191         }
3192         ADJUST_ARGS();
3193         return nfserr;
3194 }
3195
3196 static __be32
3197 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3198 {
3199         __be32 *p;
3200
3201         if (!nfserr) {
3202                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3203                 WRITEMEM(&scd->se_clientid, 8);
3204                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3205                 ADJUST_ARGS();
3206         }
3207         else if (nfserr == nfserr_clid_inuse) {
3208                 RESERVE_SPACE(8);
3209                 WRITE32(0);
3210                 WRITE32(0);
3211                 ADJUST_ARGS();
3212         }
3213         return nfserr;
3214 }
3215
3216 static __be32
3217 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3218 {
3219         __be32 *p;
3220
3221         if (!nfserr) {
3222                 RESERVE_SPACE(16);
3223                 WRITE32(write->wr_bytes_written);
3224                 WRITE32(write->wr_how_written);
3225                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3226                 ADJUST_ARGS();
3227         }
3228         return nfserr;
3229 }
3230
3231 static __be32
3232 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3233                          struct nfsd4_exchange_id *exid)
3234 {
3235         __be32 *p;
3236         char *major_id;
3237         char *server_scope;
3238         int major_id_sz;
3239         int server_scope_sz;
3240         uint64_t minor_id = 0;
3241
3242         if (nfserr)
3243                 return nfserr;
3244
3245         major_id = utsname()->nodename;
3246         major_id_sz = strlen(major_id);
3247         server_scope = utsname()->nodename;
3248         server_scope_sz = strlen(server_scope);
3249
3250         RESERVE_SPACE(
3251                 8 /* eir_clientid */ +
3252                 4 /* eir_sequenceid */ +
3253                 4 /* eir_flags */ +
3254                 4 /* spr_how (SP4_NONE) */ +
3255                 8 /* so_minor_id */ +
3256                 4 /* so_major_id.len */ +
3257                 (XDR_QUADLEN(major_id_sz) * 4) +
3258                 4 /* eir_server_scope.len */ +
3259                 (XDR_QUADLEN(server_scope_sz) * 4) +
3260                 4 /* eir_server_impl_id.count (0) */);
3261
3262         WRITEMEM(&exid->clientid, 8);
3263         WRITE32(exid->seqid);
3264         WRITE32(exid->flags);
3265
3266         /* state_protect4_r. Currently only support SP4_NONE */
3267         BUG_ON(exid->spa_how != SP4_NONE);
3268         WRITE32(exid->spa_how);
3269
3270         /* The server_owner struct */
3271         WRITE64(minor_id);      /* Minor id */
3272         /* major id */
3273         WRITE32(major_id_sz);
3274         WRITEMEM(major_id, major_id_sz);
3275
3276         /* Server scope */
3277         WRITE32(server_scope_sz);
3278         WRITEMEM(server_scope, server_scope_sz);
3279
3280         /* Implementation id */
3281         WRITE32(0);     /* zero length nfs_impl_id4 array */
3282         ADJUST_ARGS();
3283         return 0;
3284 }
3285
3286 static __be32
3287 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3288                             struct nfsd4_create_session *sess)
3289 {
3290         __be32 *p;
3291
3292         if (nfserr)
3293                 return nfserr;
3294
3295         RESERVE_SPACE(24);
3296         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3297         WRITE32(sess->seqid);
3298         WRITE32(sess->flags);
3299         ADJUST_ARGS();
3300
3301         RESERVE_SPACE(28);
3302         WRITE32(0); /* headerpadsz */
3303         WRITE32(sess->fore_channel.maxreq_sz);
3304         WRITE32(sess->fore_channel.maxresp_sz);
3305         WRITE32(sess->fore_channel.maxresp_cached);
3306         WRITE32(sess->fore_channel.maxops);
3307         WRITE32(sess->fore_channel.maxreqs);
3308         WRITE32(sess->fore_channel.nr_rdma_attrs);
3309         ADJUST_ARGS();
3310
3311         if (sess->fore_channel.nr_rdma_attrs) {
3312                 RESERVE_SPACE(4);
3313                 WRITE32(sess->fore_channel.rdma_attrs);
3314                 ADJUST_ARGS();
3315         }
3316
3317         RESERVE_SPACE(28);
3318         WRITE32(0); /* headerpadsz */
3319         WRITE32(sess->back_channel.maxreq_sz);
3320         WRITE32(sess->back_channel.maxresp_sz);
3321         WRITE32(sess->back_channel.maxresp_cached);
3322         WRITE32(sess->back_channel.maxops);
3323         WRITE32(sess->back_channel.maxreqs);
3324         WRITE32(sess->back_channel.nr_rdma_attrs);
3325         ADJUST_ARGS();
3326
3327         if (sess->back_channel.nr_rdma_attrs) {
3328                 RESERVE_SPACE(4);
3329                 WRITE32(sess->back_channel.rdma_attrs);
3330                 ADJUST_ARGS();
3331         }
3332         return 0;
3333 }
3334
3335 static __be32
3336 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3337                              struct nfsd4_destroy_session *destroy_session)
3338 {
3339         return nfserr;
3340 }
3341
3342 static __be32
3343 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3344                           struct nfsd4_free_stateid *free_stateid)
3345 {
3346         __be32 *p;
3347
3348         if (nfserr)
3349                 return nfserr;
3350
3351         RESERVE_SPACE(4);
3352         *p++ = nfserr;
3353         ADJUST_ARGS();
3354         return nfserr;
3355 }
3356
3357 static __be32
3358 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3359                       struct nfsd4_sequence *seq)
3360 {
3361         __be32 *p;
3362
3363         if (nfserr)
3364                 return nfserr;
3365
3366         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3367         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3368         WRITE32(seq->seqid);
3369         WRITE32(seq->slotid);
3370         /* Note slotid's are numbered from zero: */
3371         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3372         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3373         WRITE32(seq->status_flags);
3374
3375         ADJUST_ARGS();
3376         resp->cstate.datap = p; /* DRC cache data pointer */
3377         return 0;
3378 }
3379
3380 static __be32
3381 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3382                           struct nfsd4_test_stateid *test_stateid)
3383 {
3384         struct nfsd4_test_stateid_id *stateid, *next;
3385         __be32 *p;
3386
3387         if (nfserr)
3388                 return nfserr;
3389
3390         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3391         *p++ = htonl(test_stateid->ts_num_ids);
3392
3393         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3394                 *p++ = stateid->ts_id_status;
3395         }
3396
3397         ADJUST_ARGS();
3398         return nfserr;
3399 }
3400
3401 static __be32
3402 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3403 {
3404         return nfserr;
3405 }
3406
3407 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3408
3409 /*
3410  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3411  * since we don't need to filter out obsolete ops as this is
3412  * done in the decoding phase.
3413  */
3414 static nfsd4_enc nfsd4_enc_ops[] = {
3415         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3416         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3417         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3418         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3419         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3420         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3421         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3422         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3423         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3424         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3425         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3426         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3427         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3428         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3429         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3430         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3431         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3432         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3433         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3434         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3435         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3436         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3437         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3438         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3439         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3440         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3441         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3442         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3443         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3444         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3445         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3446         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3447         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3448         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3449         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3450         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3451         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3452
3453         /* NFSv4.1 operations */
3454         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3455         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3456         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3457         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3458         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3459         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3460         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3461         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3462         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3463         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3464         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3465         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3466         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3467         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3468         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3469         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3470         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3471         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3472         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3473 };
3474
3475 /*
3476  * Calculate the total amount of memory that the compound response has taken
3477  * after encoding the current operation with pad.
3478  *
3479  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3480  *      which was specified at nfsd4_operation, else pad is zero.
3481  *
3482  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3483  *
3484  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3485  * will be at least a page and will therefore hold the xdr_buf head.
3486  */
3487 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3488 {
3489         struct xdr_buf *xb = &resp->rqstp->rq_res;
3490         struct nfsd4_session *session = NULL;
3491         struct nfsd4_slot *slot = resp->cstate.slot;
3492         u32 length, tlen = 0;
3493
3494         if (!nfsd4_has_session(&resp->cstate))
3495                 return 0;
3496
3497         session = resp->cstate.session;
3498         if (session == NULL)
3499                 return 0;
3500
3501         if (xb->page_len == 0) {
3502                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3503         } else {
3504                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3505                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3506
3507                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3508         }
3509         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3510                 length, xb->page_len, tlen, pad);
3511
3512         if (length > session->se_fchannel.maxresp_sz)
3513                 return nfserr_rep_too_big;
3514
3515         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3516             length > session->se_fchannel.maxresp_cached)
3517                 return nfserr_rep_too_big_to_cache;
3518
3519         return 0;
3520 }
3521
3522 void
3523 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3524 {
3525         struct nfs4_stateowner *so = resp->cstate.replay_owner;
3526         __be32 *statp;
3527         __be32 *p;
3528
3529         RESERVE_SPACE(8);
3530         WRITE32(op->opnum);
3531         statp = p++;    /* to be backfilled at the end */
3532         ADJUST_ARGS();
3533
3534         if (op->opnum == OP_ILLEGAL)
3535                 goto status;
3536         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3537                !nfsd4_enc_ops[op->opnum]);
3538         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3539         /* nfsd4_check_drc_limit guarantees enough room for error status */
3540         if (!op->status)
3541                 op->status = nfsd4_check_resp_size(resp, 0);
3542         if (so) {
3543                 so->so_replay.rp_status = op->status;
3544                 so->so_replay.rp_buflen = (char *)resp->p - (char *)(statp+1);
3545                 memcpy(so->so_replay.rp_buf, statp+1, so->so_replay.rp_buflen);
3546         }
3547 status:
3548         /*
3549          * Note: We write the status directly, instead of using WRITE32(),
3550          * since it is already in network byte order.
3551          */
3552         *statp = op->status;
3553 }
3554
3555 /*
3556  * Encode the reply stored in the stateowner reply cache
3557  *
3558  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3559  * previously sent already encoded operation.
3560  *
3561  * called with nfs4_lock_state() held
3562  */
3563 void
3564 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3565 {
3566         __be32 *p;
3567         struct nfs4_replay *rp = op->replay;
3568
3569         BUG_ON(!rp);
3570
3571         RESERVE_SPACE(8);
3572         WRITE32(op->opnum);
3573         *p++ = rp->rp_status;  /* already xdr'ed */
3574         ADJUST_ARGS();
3575
3576         RESERVE_SPACE(rp->rp_buflen);
3577         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3578         ADJUST_ARGS();
3579 }
3580
3581 int
3582 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3583 {
3584         return xdr_ressize_check(rqstp, p);
3585 }
3586
3587 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3588 {
3589         struct svc_rqst *rqstp = rq;
3590         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3591
3592         if (args->ops != args->iops) {
3593                 kfree(args->ops);
3594                 args->ops = args->iops;
3595         }
3596         kfree(args->tmpp);
3597         args->tmpp = NULL;
3598         while (args->to_free) {
3599                 struct tmpbuf *tb = args->to_free;
3600                 args->to_free = tb->next;
3601                 tb->release(tb->buf);
3602                 kfree(tb);
3603         }
3604         return 1;
3605 }
3606
3607 int
3608 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3609 {
3610         args->p = p;
3611         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3612         args->pagelist = rqstp->rq_arg.pages;
3613         args->pagelen = rqstp->rq_arg.page_len;
3614         args->tmpp = NULL;
3615         args->to_free = NULL;
3616         args->ops = args->iops;
3617         args->rqstp = rqstp;
3618
3619         return !nfsd4_decode_compound(args);
3620 }
3621
3622 int
3623 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3624 {
3625         /*
3626          * All that remains is to write the tag and operation count...
3627          */
3628         struct nfsd4_compound_state *cs = &resp->cstate;
3629         struct kvec *iov;
3630         p = resp->tagp;
3631         *p++ = htonl(resp->taglen);
3632         memcpy(p, resp->tag, resp->taglen);
3633         p += XDR_QUADLEN(resp->taglen);
3634         *p++ = htonl(resp->opcnt);
3635
3636         if (rqstp->rq_res.page_len)
3637                 iov = &rqstp->rq_res.tail[0];
3638         else
3639                 iov = &rqstp->rq_res.head[0];
3640         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3641         BUG_ON(iov->iov_len > PAGE_SIZE);
3642         if (nfsd4_has_session(cs)) {
3643                 if (cs->status != nfserr_replay_cache) {
3644                         nfsd4_store_cache_entry(resp);
3645                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3646                 }
3647                 /* Renew the clientid on success and on replay */
3648                 put_client_renew(cs->session->se_client);
3649                 nfsd4_put_session(cs->session);
3650         }
3651         return 1;
3652 }
3653
3654 /*
3655  * Local variables:
3656  *  c-basic-offset: 8
3657  * End:
3658  */