fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/slab.h>
  44 #include <linux/namei.h>
  45 #include <linux/statfs.h>
  46 #include <linux/utsname.h>
  47 #include <linux/pagemap.h>
  48 #include <linux/sunrpc/svcauth_gss.h>
  49
  50 #include "idmap.h"
  51 #include "acl.h"
  52 #include "xdr4.h"
  53 #include "vfs.h"
  54 #include "state.h"
  55 #include "cache.h"
  56 #include "netns.h"
  57
  58 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  59
  60 /*
  61  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  62  * directory in order to indicate to the client that a filesystem boundary is present
  63  * We use a fixed fsid for a referral
  64  */
  65 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  66 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  67
  68 static __be32
  69 check_filename(char *str, int len)
  70 {
  71         int i;
  72
  73         if (len == 0)
  74                 return nfserr_inval;
  75         if (isdotent(str, len))
  76                 return nfserr_badname;
  77         for (i = 0; i < len; i++)
  78                 if (str[i] == '/')
  79                         return nfserr_badname;
  80         return 0;
  81 }
  82
  83 #define DECODE_HEAD                             \
  84         __be32 *p;                              \
  85         __be32 status
  86 #define DECODE_TAIL                             \
  87         status = 0;                             \
  88 out:                                            \
  89         return status;                          \
  90 xdr_error:                                      \
  91         dprintk("NFSD: xdr error (%s:%d)\n",    \
  92                         __FILE__, __LINE__);    \
  93         status = nfserr_bad_xdr;                \
  94         goto out
  95
  96 #define READ32(x)         (x) = ntohl(*p++)
  97 #define READ64(x)         do {                  \
  98         (x) = (u64)ntohl(*p++) << 32;           \
  99         (x) |= ntohl(*p++);                     \
 100 } while (0)
 101 #define READTIME(x)       do {                  \
 102         p++;                                    \
 103         (x) = ntohl(*p++);                      \
 104         p++;                                    \
 105 } while (0)
 106 #define READMEM(x,nbytes) do {                  \
 107         x = (char *)p;                          \
 108         p += XDR_QUADLEN(nbytes);               \
 109 } while (0)
 110 #define SAVEMEM(x,nbytes) do {                  \
 111         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 112                 savemem(argp, p, nbytes) :      \
 113                 (char *)p)) {                   \
 114                 dprintk("NFSD: xdr error (%s:%d)\n", \
 115                                 __FILE__, __LINE__); \
 116                 goto xdr_error;                 \
 117                 }                               \
 118         p += XDR_QUADLEN(nbytes);               \
 119 } while (0)
 120 #define COPYMEM(x,nbytes) do {                  \
 121         memcpy((x), p, nbytes);                 \
 122         p += XDR_QUADLEN(nbytes);               \
 123 } while (0)
 124
 125 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 126 #define READ_BUF(nbytes)  do {                  \
 127         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 128                 p = argp->p;                    \
 129                 argp->p += XDR_QUADLEN(nbytes); \
 130         } else if (!(p = read_buf(argp, nbytes))) { \
 131                 dprintk("NFSD: xdr error (%s:%d)\n", \
 132                                 __FILE__, __LINE__); \
 133                 goto xdr_error;                 \
 134         }                                       \
 135 } while (0)
 136
 137 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 138 {
 139         /* We want more bytes than seem to be available.
 140          * Maybe we need a new page, maybe we have just run out
 141          */
 142         unsigned int avail = (char *)argp->end - (char *)argp->p;
 143         __be32 *p;
 144         if (avail + argp->pagelen < nbytes)
 145                 return NULL;
 146         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 147                 return NULL;
 148         /* ok, we can do it with the current plus the next page */
 149         if (nbytes <= sizeof(argp->tmp))
 150                 p = argp->tmp;
 151         else {
 152                 kfree(argp->tmpp);
 153                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 154                 if (!p)
 155                         return NULL;
 156
 157         }
 158         /*
 159          * The following memcpy is safe because read_buf is always
 160          * called with nbytes > avail, and the two cases above both
 161          * guarantee p points to at least nbytes bytes.
 162          */
 163         memcpy(p, argp->p, avail);
 164         /* step to next page */
 165         argp->p = page_address(argp->pagelist[0]);
 166         argp->pagelist++;
 167         if (argp->pagelen < PAGE_SIZE) {
 168                 argp->end = argp->p + (argp->pagelen>>2);
 169                 argp->pagelen = 0;
 170         } else {
 171                 argp->end = argp->p + (PAGE_SIZE>>2);
 172                 argp->pagelen -= PAGE_SIZE;
 173         }
 174         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 175         argp->p += XDR_QUADLEN(nbytes - avail);
 176         return p;
 177 }
 178
 179 static int zero_clientid(clientid_t *clid)
 180 {
 181         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 182 }
 183
 184 static int
 185 defer_free(struct nfsd4_compoundargs *argp,
 186                 void (*release)(const void *), void *p)
 187 {
 188         struct tmpbuf *tb;
 189
 190         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 191         if (!tb)
 192                 return -ENOMEM;
 193         tb->buf = p;
 194         tb->release = release;
 195         tb->next = argp->to_free;
 196         argp->to_free = tb;
 197         return 0;
 198 }
 199
 200 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 201 {
 202         if (p == argp->tmp) {
 203                 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
 204                 if (!p)
 205                         return NULL;
 206         } else {
 207                 BUG_ON(p != argp->tmpp);
 208                 argp->tmpp = NULL;
 209         }
 210         if (defer_free(argp, kfree, p)) {
 211                 kfree(p);
 212                 return NULL;
 213         } else
 214                 return (char *)p;
 215 }
 216
 217 static __be32
 218 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 219 {
 220         u32 bmlen;
 221         DECODE_HEAD;
 222
 223         bmval[0] = 0;
 224         bmval[1] = 0;
 225         bmval[2] = 0;
 226
 227         READ_BUF(4);
 228         READ32(bmlen);
 229         if (bmlen > 1000)
 230                 goto xdr_error;
 231
 232         READ_BUF(bmlen << 2);
 233         if (bmlen > 0)
 234                 READ32(bmval[0]);
 235         if (bmlen > 1)
 236                 READ32(bmval[1]);
 237         if (bmlen > 2)
 238                 READ32(bmval[2]);
 239
 240         DECODE_TAIL;
 241 }
 242
 243 static __be32
 244 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 245                    struct iattr *iattr, struct nfs4_acl **acl)
 246 {
 247         int expected_len, len = 0;
 248         u32 dummy32;
 249         char *buf;
 250         int host_err;
 251
 252         DECODE_HEAD;
 253         iattr->ia_valid = 0;
 254         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 255                 return status;
 256
 257         READ_BUF(4);
 258         READ32(expected_len);
 259
 260         if (bmval[0] & FATTR4_WORD0_SIZE) {
 261                 READ_BUF(8);
 262                 len += 8;
 263                 READ64(iattr->ia_size);
 264                 iattr->ia_valid |= ATTR_SIZE;
 265         }
 266         if (bmval[0] & FATTR4_WORD0_ACL) {
 267                 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                         READ32(dummy32);
 348                         if (dummy32)
 349                                 return nfserr_inval;
 350                         READ32(iattr->ia_atime.tv_sec);
 351                         READ32(iattr->ia_atime.tv_nsec);
 352                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 353                                 return nfserr_inval;
 354                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 355                         break;
 356                 case NFS4_SET_TO_SERVER_TIME:
 357                         iattr->ia_valid |= ATTR_ATIME;
 358                         break;
 359                 default:
 360                         goto xdr_error;
 361                 }
 362         }
 363         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 364                 READ_BUF(4);
 365                 len += 4;
 366                 READ32(dummy32);
 367                 switch (dummy32) {
 368                 case NFS4_SET_TO_CLIENT_TIME:
 369                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 370                            all 32 bits of 'nseconds'. */
 371                         READ_BUF(12);
 372                         len += 12;
 373                         READ32(dummy32);
 374                         if (dummy32)
 375                                 return nfserr_inval;
 376                         READ32(iattr->ia_mtime.tv_sec);
 377                         READ32(iattr->ia_mtime.tv_nsec);
 378                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 379                                 return nfserr_inval;
 380                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 381                         break;
 382                 case NFS4_SET_TO_SERVER_TIME:
 383                         iattr->ia_valid |= ATTR_MTIME;
 384                         break;
 385                 default:
 386                         goto xdr_error;
 387                 }
 388         }
 389         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 390             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 391             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 392                 READ_BUF(expected_len - len);
 393         else if (len != expected_len)
 394                 goto xdr_error;
 395
 396         DECODE_TAIL;
 397
 398 out_nfserr:
 399         status = nfserrno(host_err);
 400         goto out;
 401 }
 402
 403 static __be32
 404 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 405 {
 406         DECODE_HEAD;
 407
 408         READ_BUF(sizeof(stateid_t));
 409         READ32(sid->si_generation);
 410         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 411
 412         DECODE_TAIL;
 413 }
 414
 415 static __be32
 416 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 417 {
 418         DECODE_HEAD;
 419
 420         READ_BUF(4);
 421         READ32(access->ac_req_access);
 422
 423         DECODE_TAIL;
 424 }
 425
 426 static __be32 nfsd4_decode_cb_sec(struct nfsd4_compoundargs *argp, struct nfsd4_cb_sec *cbs)
 427 {
 428         DECODE_HEAD;
 429         u32 dummy, uid, gid;
 430         char *machine_name;
 431         int i;
 432         int nr_secflavs;
 433
 434         /* callback_sec_params4 */
 435         READ_BUF(4);
 436         READ32(nr_secflavs);
 437         cbs->flavor = (u32)(-1);
 438         for (i = 0; i < nr_secflavs; ++i) {
 439                 READ_BUF(4);
 440                 READ32(dummy);
 441                 switch (dummy) {
 442                 case RPC_AUTH_NULL:
 443                         /* Nothing to read */
 444                         if (cbs->flavor == (u32)(-1))
 445                                 cbs->flavor = RPC_AUTH_NULL;
 446                         break;
 447                 case RPC_AUTH_UNIX:
 448                         READ_BUF(8);
 449                         /* stamp */
 450                         READ32(dummy);
 451
 452                         /* machine name */
 453                         READ32(dummy);
 454                         READ_BUF(dummy);
 455                         SAVEMEM(machine_name, dummy);
 456
 457                         /* uid, gid */
 458                         READ_BUF(8);
 459                         READ32(uid);
 460                         READ32(gid);
 461
 462                         /* more gids */
 463                         READ_BUF(4);
 464                         READ32(dummy);
 465                         READ_BUF(dummy * 4);
 466                         if (cbs->flavor == (u32)(-1)) {
 467                                 kuid_t kuid = make_kuid(&init_user_ns, uid);
 468                                 kgid_t kgid = make_kgid(&init_user_ns, gid);
 469                                 if (uid_valid(kuid) && gid_valid(kgid)) {
 470                                         cbs->uid = kuid;
 471                                         cbs->gid = kgid;
 472                                         cbs->flavor = RPC_AUTH_UNIX;
 473                                 } else {
 474                                         dprintk("RPC_AUTH_UNIX with invalid"
 475                                                 "uid or gid ignoring!\n");
 476                                 }
 477                         }
 478                         break;
 479                 case RPC_AUTH_GSS:
 480                         dprintk("RPC_AUTH_GSS callback secflavor "
 481                                 "not supported!\n");
 482                         READ_BUF(8);
 483                         /* gcbp_service */
 484                         READ32(dummy);
 485                         /* gcbp_handle_from_server */
 486                         READ32(dummy);
 487                         READ_BUF(dummy);
 488                         p += XDR_QUADLEN(dummy);
 489                         /* gcbp_handle_from_client */
 490                         READ_BUF(4);
 491                         READ32(dummy);
 492                         READ_BUF(dummy);
 493                         break;
 494                 default:
 495                         dprintk("Illegal callback secflavor\n");
 496                         return nfserr_inval;
 497                 }
 498         }
 499         DECODE_TAIL;
 500 }
 501
 502 static __be32 nfsd4_decode_backchannel_ctl(struct nfsd4_compoundargs *argp, struct nfsd4_backchannel_ctl *bc)
 503 {
 504         DECODE_HEAD;
 505
 506         READ_BUF(4);
 507         READ32(bc->bc_cb_program);
 508         nfsd4_decode_cb_sec(argp, &bc->bc_cb_sec);
 509
 510         DECODE_TAIL;
 511 }
 512
 513 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 514 {
 515         DECODE_HEAD;
 516
 517         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 518         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 519         READ32(bcts->dir);
 520         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 521          * could help us figure out we should be using it. */
 522         DECODE_TAIL;
 523 }
 524
 525 static __be32
 526 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 527 {
 528         DECODE_HEAD;
 529
 530         READ_BUF(4);
 531         READ32(close->cl_seqid);
 532         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 533
 534         DECODE_TAIL;
 535 }
 536
 537
 538 static __be32
 539 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 540 {
 541         DECODE_HEAD;
 542
 543         READ_BUF(12);
 544         READ64(commit->co_offset);
 545         READ32(commit->co_count);
 546
 547         DECODE_TAIL;
 548 }
 549
 550 static __be32
 551 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 552 {
 553         DECODE_HEAD;
 554
 555         READ_BUF(4);
 556         READ32(create->cr_type);
 557         switch (create->cr_type) {
 558         case NF4LNK:
 559                 READ_BUF(4);
 560                 READ32(create->cr_linklen);
 561                 READ_BUF(create->cr_linklen);
 562                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 563                 break;
 564         case NF4BLK:
 565         case NF4CHR:
 566                 READ_BUF(8);
 567                 READ32(create->cr_specdata1);
 568                 READ32(create->cr_specdata2);
 569                 break;
 570         case NF4SOCK:
 571         case NF4FIFO:
 572         case NF4DIR:
 573         default:
 574                 break;
 575         }
 576
 577         READ_BUF(4);
 578         READ32(create->cr_namelen);
 579         READ_BUF(create->cr_namelen);
 580         SAVEMEM(create->cr_name, create->cr_namelen);
 581         if ((status = check_filename(create->cr_name, create->cr_namelen)))
 582                 return status;
 583
 584         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 585                                     &create->cr_acl);
 586         if (status)
 587                 goto out;
 588
 589         DECODE_TAIL;
 590 }
 591
 592 static inline __be32
 593 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 594 {
 595         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 596 }
 597
 598 static inline __be32
 599 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 600 {
 601         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 602 }
 603
 604 static __be32
 605 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 606 {
 607         DECODE_HEAD;
 608
 609         READ_BUF(4);
 610         READ32(link->li_namelen);
 611         READ_BUF(link->li_namelen);
 612         SAVEMEM(link->li_name, link->li_namelen);
 613         if ((status = check_filename(link->li_name, link->li_namelen)))
 614                 return status;
 615
 616         DECODE_TAIL;
 617 }
 618
 619 static __be32
 620 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 621 {
 622         DECODE_HEAD;
 623
 624         /*
 625         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 626         */
 627         READ_BUF(28);
 628         READ32(lock->lk_type);
 629         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 630                 goto xdr_error;
 631         READ32(lock->lk_reclaim);
 632         READ64(lock->lk_offset);
 633         READ64(lock->lk_length);
 634         READ32(lock->lk_is_new);
 635
 636         if (lock->lk_is_new) {
 637                 READ_BUF(4);
 638                 READ32(lock->lk_new_open_seqid);
 639                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 640                 if (status)
 641                         return status;
 642                 READ_BUF(8 + sizeof(clientid_t));
 643                 READ32(lock->lk_new_lock_seqid);
 644                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 645                 READ32(lock->lk_new_owner.len);
 646                 READ_BUF(lock->lk_new_owner.len);
 647                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 648         } else {
 649                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 650                 if (status)
 651                         return status;
 652                 READ_BUF(4);
 653                 READ32(lock->lk_old_lock_seqid);
 654         }
 655
 656         DECODE_TAIL;
 657 }
 658
 659 static __be32
 660 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 661 {
 662         DECODE_HEAD;
 663
 664         READ_BUF(32);
 665         READ32(lockt->lt_type);
 666         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 667                 goto xdr_error;
 668         READ64(lockt->lt_offset);
 669         READ64(lockt->lt_length);
 670         COPYMEM(&lockt->lt_clientid, 8);
 671         READ32(lockt->lt_owner.len);
 672         READ_BUF(lockt->lt_owner.len);
 673         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 674
 675         DECODE_TAIL;
 676 }
 677
 678 static __be32
 679 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 680 {
 681         DECODE_HEAD;
 682
 683         READ_BUF(8);
 684         READ32(locku->lu_type);
 685         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 686                 goto xdr_error;
 687         READ32(locku->lu_seqid);
 688         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 689         if (status)
 690                 return status;
 691         READ_BUF(16);
 692         READ64(locku->lu_offset);
 693         READ64(locku->lu_length);
 694
 695         DECODE_TAIL;
 696 }
 697
 698 static __be32
 699 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 700 {
 701         DECODE_HEAD;
 702
 703         READ_BUF(4);
 704         READ32(lookup->lo_len);
 705         READ_BUF(lookup->lo_len);
 706         SAVEMEM(lookup->lo_name, lookup->lo_len);
 707         if ((status = check_filename(lookup->lo_name, lookup->lo_len)))
 708                 return status;
 709
 710         DECODE_TAIL;
 711 }
 712
 713 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 714 {
 715         __be32 *p;
 716         u32 w;
 717
 718         READ_BUF(4);
 719         READ32(w);
 720         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 721         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 722         if (deleg_when)
 723                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 724
 725         switch (w & NFS4_SHARE_ACCESS_MASK) {
 726         case NFS4_SHARE_ACCESS_READ:
 727         case NFS4_SHARE_ACCESS_WRITE:
 728         case NFS4_SHARE_ACCESS_BOTH:
 729                 break;
 730         default:
 731                 return nfserr_bad_xdr;
 732         }
 733         w &= ~NFS4_SHARE_ACCESS_MASK;
 734         if (!w)
 735                 return nfs_ok;
 736         if (!argp->minorversion)
 737                 return nfserr_bad_xdr;
 738         switch (w & NFS4_SHARE_WANT_MASK) {
 739         case NFS4_SHARE_WANT_NO_PREFERENCE:
 740         case NFS4_SHARE_WANT_READ_DELEG:
 741         case NFS4_SHARE_WANT_WRITE_DELEG:
 742         case NFS4_SHARE_WANT_ANY_DELEG:
 743         case NFS4_SHARE_WANT_NO_DELEG:
 744         case NFS4_SHARE_WANT_CANCEL:
 745                 break;
 746         default:
 747                 return nfserr_bad_xdr;
 748         }
 749         w &= ~NFS4_SHARE_WANT_MASK;
 750         if (!w)
 751                 return nfs_ok;
 752
 753         if (!deleg_when)        /* open_downgrade */
 754                 return nfserr_inval;
 755         switch (w) {
 756         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 757         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 758         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 759               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 760                 return nfs_ok;
 761         }
 762 xdr_error:
 763         return nfserr_bad_xdr;
 764 }
 765
 766 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 767 {
 768         __be32 *p;
 769
 770         READ_BUF(4);
 771         READ32(*x);
 772         /* Note: unlinke access bits, deny bits may be zero. */
 773         if (*x & ~NFS4_SHARE_DENY_BOTH)
 774                 return nfserr_bad_xdr;
 775         return nfs_ok;
 776 xdr_error:
 777         return nfserr_bad_xdr;
 778 }
 779
 780 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 781 {
 782         __be32 *p;
 783
 784         READ_BUF(4);
 785         READ32(o->len);
 786
 787         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 788                 return nfserr_bad_xdr;
 789
 790         READ_BUF(o->len);
 791         SAVEMEM(o->data, o->len);
 792         return nfs_ok;
 793 xdr_error:
 794         return nfserr_bad_xdr;
 795 }
 796
 797 static __be32
 798 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 799 {
 800         DECODE_HEAD;
 801         u32 dummy;
 802
 803         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 804         open->op_iattr.ia_valid = 0;
 805         open->op_openowner = NULL;
 806
 807         open->op_xdr_error = 0;
 808         /* seqid, share_access, share_deny, clientid, ownerlen */
 809         READ_BUF(4);
 810         READ32(open->op_seqid);
 811         /* decode, yet ignore deleg_when until supported */
 812         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 813                                            &open->op_deleg_want, &dummy);
 814         if (status)
 815                 goto xdr_error;
 816         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 817         if (status)
 818                 goto xdr_error;
 819         READ_BUF(sizeof(clientid_t));
 820         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 821         status = nfsd4_decode_opaque(argp, &open->op_owner);
 822         if (status)
 823                 goto xdr_error;
 824         READ_BUF(4);
 825         READ32(open->op_create);
 826         switch (open->op_create) {
 827         case NFS4_OPEN_NOCREATE:
 828                 break;
 829         case NFS4_OPEN_CREATE:
 830                 READ_BUF(4);
 831                 READ32(open->op_createmode);
 832                 switch (open->op_createmode) {
 833                 case NFS4_CREATE_UNCHECKED:
 834                 case NFS4_CREATE_GUARDED:
 835                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 836                                 &open->op_iattr, &open->op_acl);
 837                         if (status)
 838                                 goto out;
 839                         break;
 840                 case NFS4_CREATE_EXCLUSIVE:
 841                         READ_BUF(NFS4_VERIFIER_SIZE);
 842                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 843                         break;
 844                 case NFS4_CREATE_EXCLUSIVE4_1:
 845                         if (argp->minorversion < 1)
 846                                 goto xdr_error;
 847                         READ_BUF(NFS4_VERIFIER_SIZE);
 848                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 849                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 850                                 &open->op_iattr, &open->op_acl);
 851                         if (status)
 852                                 goto out;
 853                         break;
 854                 default:
 855                         goto xdr_error;
 856                 }
 857                 break;
 858         default:
 859                 goto xdr_error;
 860         }
 861
 862         /* open_claim */
 863         READ_BUF(4);
 864         READ32(open->op_claim_type);
 865         switch (open->op_claim_type) {
 866         case NFS4_OPEN_CLAIM_NULL:
 867         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 868                 READ_BUF(4);
 869                 READ32(open->op_fname.len);
 870                 READ_BUF(open->op_fname.len);
 871                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 872                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 873                         return status;
 874                 break;
 875         case NFS4_OPEN_CLAIM_PREVIOUS:
 876                 READ_BUF(4);
 877                 READ32(open->op_delegate_type);
 878                 break;
 879         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 880                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 881                 if (status)
 882                         return status;
 883                 READ_BUF(4);
 884                 READ32(open->op_fname.len);
 885                 READ_BUF(open->op_fname.len);
 886                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 887                 if ((status = check_filename(open->op_fname.data, open->op_fname.len)))
 888                         return status;
 889                 break;
 890         case NFS4_OPEN_CLAIM_FH:
 891         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 892                 if (argp->minorversion < 1)
 893                         goto xdr_error;
 894                 /* void */
 895                 break;
 896         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 897                 if (argp->minorversion < 1)
 898                         goto xdr_error;
 899                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 900                 if (status)
 901                         return status;
 902                 break;
 903         default:
 904                 goto xdr_error;
 905         }
 906
 907         DECODE_TAIL;
 908 }
 909
 910 static __be32
 911 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 912 {
 913         DECODE_HEAD;
 914
 915         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 916         if (status)
 917                 return status;
 918         READ_BUF(4);
 919         READ32(open_conf->oc_seqid);
 920
 921         DECODE_TAIL;
 922 }
 923
 924 static __be32
 925 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 926 {
 927         DECODE_HEAD;
 928
 929         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 930         if (status)
 931                 return status;
 932         READ_BUF(4);
 933         READ32(open_down->od_seqid);
 934         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 935                                            &open_down->od_deleg_want, NULL);
 936         if (status)
 937                 return status;
 938         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 939         if (status)
 940                 return status;
 941         DECODE_TAIL;
 942 }
 943
 944 static __be32
 945 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 946 {
 947         DECODE_HEAD;
 948
 949         READ_BUF(4);
 950         READ32(putfh->pf_fhlen);
 951         if (putfh->pf_fhlen > NFS4_FHSIZE)
 952                 goto xdr_error;
 953         READ_BUF(putfh->pf_fhlen);
 954         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 955
 956         DECODE_TAIL;
 957 }
 958
 959 static __be32
 960 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 961 {
 962         DECODE_HEAD;
 963
 964         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 965         if (status)
 966                 return status;
 967         READ_BUF(12);
 968         READ64(read->rd_offset);
 969         READ32(read->rd_length);
 970
 971         DECODE_TAIL;
 972 }
 973
 974 static __be32
 975 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 976 {
 977         DECODE_HEAD;
 978
 979         READ_BUF(24);
 980         READ64(readdir->rd_cookie);
 981         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 982         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 983         READ32(readdir->rd_maxcount);
 984         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 985                 goto out;
 986
 987         DECODE_TAIL;
 988 }
 989
 990 static __be32
 991 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 992 {
 993         DECODE_HEAD;
 994
 995         READ_BUF(4);
 996         READ32(remove->rm_namelen);
 997         READ_BUF(remove->rm_namelen);
 998         SAVEMEM(remove->rm_name, remove->rm_namelen);
 999         if ((status = check_filename(remove->rm_name, remove->rm_namelen)))
1000                 return status;
1001
1002         DECODE_TAIL;
1003 }
1004
1005 static __be32
1006 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
1007 {
1008         DECODE_HEAD;
1009
1010         READ_BUF(4);
1011         READ32(rename->rn_snamelen);
1012         READ_BUF(rename->rn_snamelen + 4);
1013         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
1014         READ32(rename->rn_tnamelen);
1015         READ_BUF(rename->rn_tnamelen);
1016         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
1017         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen)))
1018                 return status;
1019         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen)))
1020                 return status;
1021
1022         DECODE_TAIL;
1023 }
1024
1025 static __be32
1026 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
1027 {
1028         DECODE_HEAD;
1029
1030         READ_BUF(sizeof(clientid_t));
1031         COPYMEM(clientid, sizeof(clientid_t));
1032
1033         DECODE_TAIL;
1034 }
1035
1036 static __be32
1037 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
1038                      struct nfsd4_secinfo *secinfo)
1039 {
1040         DECODE_HEAD;
1041
1042         READ_BUF(4);
1043         READ32(secinfo->si_namelen);
1044         READ_BUF(secinfo->si_namelen);
1045         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
1046         status = check_filename(secinfo->si_name, secinfo->si_namelen);
1047         if (status)
1048                 return status;
1049         DECODE_TAIL;
1050 }
1051
1052 static __be32
1053 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
1054                      struct nfsd4_secinfo_no_name *sin)
1055 {
1056         DECODE_HEAD;
1057
1058         READ_BUF(4);
1059         READ32(sin->sin_style);
1060         DECODE_TAIL;
1061 }
1062
1063 static __be32
1064 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
1065 {
1066         __be32 status;
1067
1068         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
1069         if (status)
1070                 return status;
1071         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
1072                                   &setattr->sa_acl);
1073 }
1074
1075 static __be32
1076 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1077 {
1078         DECODE_HEAD;
1079
1080         READ_BUF(NFS4_VERIFIER_SIZE);
1081         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
1082
1083         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1084         if (status)
1085                 return nfserr_bad_xdr;
1086         READ_BUF(8);
1087         READ32(setclientid->se_callback_prog);
1088         READ32(setclientid->se_callback_netid_len);
1089
1090         READ_BUF(setclientid->se_callback_netid_len + 4);
1091         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1092         READ32(setclientid->se_callback_addr_len);
1093
1094         READ_BUF(setclientid->se_callback_addr_len + 4);
1095         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1096         READ32(setclientid->se_callback_ident);
1097
1098         DECODE_TAIL;
1099 }
1100
1101 static __be32
1102 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1103 {
1104         DECODE_HEAD;
1105
1106         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1107         COPYMEM(&scd_c->sc_clientid, 8);
1108         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1109
1110         DECODE_TAIL;
1111 }
1112
1113 /* Also used for NVERIFY */
1114 static __be32
1115 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1116 {
1117         DECODE_HEAD;
1118
1119         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1120                 goto out;
1121
1122         /* For convenience's sake, we compare raw xdr'd attributes in
1123          * nfsd4_proc_verify */
1124
1125         READ_BUF(4);
1126         READ32(verify->ve_attrlen);
1127         READ_BUF(verify->ve_attrlen);
1128         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1129
1130         DECODE_TAIL;
1131 }
1132
1133 static __be32
1134 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1135 {
1136         int avail;
1137         int len;
1138         DECODE_HEAD;
1139
1140         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1141         if (status)
1142                 return status;
1143         READ_BUF(16);
1144         READ64(write->wr_offset);
1145         READ32(write->wr_stable_how);
1146         if (write->wr_stable_how > 2)
1147                 goto xdr_error;
1148         READ32(write->wr_buflen);
1149
1150         /* Sorry .. no magic macros for this.. *
1151          * READ_BUF(write->wr_buflen);
1152          * SAVEMEM(write->wr_buf, write->wr_buflen);
1153          */
1154         avail = (char*)argp->end - (char*)argp->p;
1155         if (avail + argp->pagelen < write->wr_buflen) {
1156                 dprintk("NFSD: xdr error (%s:%d)\n",
1157                                 __FILE__, __LINE__);
1158                 goto xdr_error;
1159         }
1160         write->wr_head.iov_base = p;
1161         write->wr_head.iov_len = avail;
1162         WARN_ON(avail != (XDR_QUADLEN(avail) << 2));
1163         write->wr_pagelist = argp->pagelist;
1164
1165         len = XDR_QUADLEN(write->wr_buflen) << 2;
1166         if (len >= avail) {
1167                 int pages;
1168
1169                 len -= avail;
1170
1171                 pages = len >> PAGE_SHIFT;
1172                 argp->pagelist += pages;
1173                 argp->pagelen -= pages * PAGE_SIZE;
1174                 len -= pages * PAGE_SIZE;
1175
1176                 argp->p = (__be32 *)page_address(argp->pagelist[0]);
1177                 argp->end = argp->p + XDR_QUADLEN(PAGE_SIZE);
1178         }
1179         argp->p += XDR_QUADLEN(len);
1180
1181         DECODE_TAIL;
1182 }
1183
1184 static __be32
1185 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1186 {
1187         DECODE_HEAD;
1188
1189         READ_BUF(12);
1190         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1191         READ32(rlockowner->rl_owner.len);
1192         READ_BUF(rlockowner->rl_owner.len);
1193         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1194
1195         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1196                 return nfserr_inval;
1197         DECODE_TAIL;
1198 }
1199
1200 static __be32
1201 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1202                          struct nfsd4_exchange_id *exid)
1203 {
1204         int dummy, tmp;
1205         DECODE_HEAD;
1206
1207         READ_BUF(NFS4_VERIFIER_SIZE);
1208         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1209
1210         status = nfsd4_decode_opaque(argp, &exid->clname);
1211         if (status)
1212                 return nfserr_bad_xdr;
1213
1214         READ_BUF(4);
1215         READ32(exid->flags);
1216
1217         /* Ignore state_protect4_a */
1218         READ_BUF(4);
1219         READ32(exid->spa_how);
1220         switch (exid->spa_how) {
1221         case SP4_NONE:
1222                 break;
1223         case SP4_MACH_CRED:
1224                 /* spo_must_enforce */
1225                 READ_BUF(4);
1226                 READ32(dummy);
1227                 READ_BUF(dummy * 4);
1228                 p += dummy;
1229
1230                 /* spo_must_allow */
1231                 READ_BUF(4);
1232                 READ32(dummy);
1233                 READ_BUF(dummy * 4);
1234                 p += dummy;
1235                 break;
1236         case SP4_SSV:
1237                 /* ssp_ops */
1238                 READ_BUF(4);
1239                 READ32(dummy);
1240                 READ_BUF(dummy * 4);
1241                 p += dummy;
1242
1243                 READ_BUF(4);
1244                 READ32(dummy);
1245                 READ_BUF(dummy * 4);
1246                 p += dummy;
1247
1248                 /* ssp_hash_algs<> */
1249                 READ_BUF(4);
1250                 READ32(tmp);
1251                 while (tmp--) {
1252                         READ_BUF(4);
1253                         READ32(dummy);
1254                         READ_BUF(dummy);
1255                         p += XDR_QUADLEN(dummy);
1256                 }
1257
1258                 /* ssp_encr_algs<> */
1259                 READ_BUF(4);
1260                 READ32(tmp);
1261                 while (tmp--) {
1262                         READ_BUF(4);
1263                         READ32(dummy);
1264                         READ_BUF(dummy);
1265                         p += XDR_QUADLEN(dummy);
1266                 }
1267
1268                 /* ssp_window and ssp_num_gss_handles */
1269                 READ_BUF(8);
1270                 READ32(dummy);
1271                 READ32(dummy);
1272                 break;
1273         default:
1274                 goto xdr_error;
1275         }
1276
1277         /* Ignore Implementation ID */
1278         READ_BUF(4);    /* nfs_impl_id4 array length */
1279         READ32(dummy);
1280
1281         if (dummy > 1)
1282                 goto xdr_error;
1283
1284         if (dummy == 1) {
1285                 /* nii_domain */
1286                 READ_BUF(4);
1287                 READ32(dummy);
1288                 READ_BUF(dummy);
1289                 p += XDR_QUADLEN(dummy);
1290
1291                 /* nii_name */
1292                 READ_BUF(4);
1293                 READ32(dummy);
1294                 READ_BUF(dummy);
1295                 p += XDR_QUADLEN(dummy);
1296
1297                 /* nii_date */
1298                 READ_BUF(12);
1299                 p += 3;
1300         }
1301         DECODE_TAIL;
1302 }
1303
1304 static __be32
1305 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1306                             struct nfsd4_create_session *sess)
1307 {
1308         DECODE_HEAD;
1309         u32 dummy;
1310
1311         READ_BUF(16);
1312         COPYMEM(&sess->clientid, 8);
1313         READ32(sess->seqid);
1314         READ32(sess->flags);
1315
1316         /* Fore channel attrs */
1317         READ_BUF(28);
1318         READ32(dummy); /* headerpadsz is always 0 */
1319         READ32(sess->fore_channel.maxreq_sz);
1320         READ32(sess->fore_channel.maxresp_sz);
1321         READ32(sess->fore_channel.maxresp_cached);
1322         READ32(sess->fore_channel.maxops);
1323         READ32(sess->fore_channel.maxreqs);
1324         READ32(sess->fore_channel.nr_rdma_attrs);
1325         if (sess->fore_channel.nr_rdma_attrs == 1) {
1326                 READ_BUF(4);
1327                 READ32(sess->fore_channel.rdma_attrs);
1328         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1329                 dprintk("Too many fore channel attr bitmaps!\n");
1330                 goto xdr_error;
1331         }
1332
1333         /* Back channel attrs */
1334         READ_BUF(28);
1335         READ32(dummy); /* headerpadsz is always 0 */
1336         READ32(sess->back_channel.maxreq_sz);
1337         READ32(sess->back_channel.maxresp_sz);
1338         READ32(sess->back_channel.maxresp_cached);
1339         READ32(sess->back_channel.maxops);
1340         READ32(sess->back_channel.maxreqs);
1341         READ32(sess->back_channel.nr_rdma_attrs);
1342         if (sess->back_channel.nr_rdma_attrs == 1) {
1343                 READ_BUF(4);
1344                 READ32(sess->back_channel.rdma_attrs);
1345         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1346                 dprintk("Too many back channel attr bitmaps!\n");
1347                 goto xdr_error;
1348         }
1349
1350         READ_BUF(4);
1351         READ32(sess->callback_prog);
1352         nfsd4_decode_cb_sec(argp, &sess->cb_sec);
1353         DECODE_TAIL;
1354 }
1355
1356 static __be32
1357 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1358                              struct nfsd4_destroy_session *destroy_session)
1359 {
1360         DECODE_HEAD;
1361         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1362         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1363
1364         DECODE_TAIL;
1365 }
1366
1367 static __be32
1368 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1369                           struct nfsd4_free_stateid *free_stateid)
1370 {
1371         DECODE_HEAD;
1372
1373         READ_BUF(sizeof(stateid_t));
1374         READ32(free_stateid->fr_stateid.si_generation);
1375         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1376
1377         DECODE_TAIL;
1378 }
1379
1380 static __be32
1381 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1382                       struct nfsd4_sequence *seq)
1383 {
1384         DECODE_HEAD;
1385
1386         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1387         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1388         READ32(seq->seqid);
1389         READ32(seq->slotid);
1390         READ32(seq->maxslots);
1391         READ32(seq->cachethis);
1392
1393         DECODE_TAIL;
1394 }
1395
1396 static __be32
1397 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1398 {
1399         int i;
1400         __be32 *p, status;
1401         struct nfsd4_test_stateid_id *stateid;
1402
1403         READ_BUF(4);
1404         test_stateid->ts_num_ids = ntohl(*p++);
1405
1406         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1407
1408         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1409                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1410                 if (!stateid) {
1411                         status = nfserrno(-ENOMEM);
1412                         goto out;
1413                 }
1414
1415                 defer_free(argp, kfree, stateid);
1416                 INIT_LIST_HEAD(&stateid->ts_id_list);
1417                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1418
1419                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1420                 if (status)
1421                         goto out;
1422         }
1423
1424         status = 0;
1425 out:
1426         return status;
1427 xdr_error:
1428         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1429         status = nfserr_bad_xdr;
1430         goto out;
1431 }
1432
1433 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1434 {
1435         DECODE_HEAD;
1436
1437         READ_BUF(8);
1438         COPYMEM(&dc->clientid, 8);
1439
1440         DECODE_TAIL;
1441 }
1442
1443 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1444 {
1445         DECODE_HEAD;
1446
1447         READ_BUF(4);
1448         READ32(rc->rca_one_fs);
1449
1450         DECODE_TAIL;
1451 }
1452
1453 static __be32
1454 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1455 {
1456         return nfs_ok;
1457 }
1458
1459 static __be32
1460 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1461 {
1462         return nfserr_notsupp;
1463 }
1464
1465 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1466
1467 static nfsd4_dec nfsd4_dec_ops[] = {
1468         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1469         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1470         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1471         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1472         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1473         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1474         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1475         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1476         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1477         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1478         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1479         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1480         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1481         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1482         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1483         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1484         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1485         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1486         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1487         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1488         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1489         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1490         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1491         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1492         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1493         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1494         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1495         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1496         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1497         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1498         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1499         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1500         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1501         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1502         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1503         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1504         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1505 };
1506
1507 static nfsd4_dec nfsd41_dec_ops[] = {
1508         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1509         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1510         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1511         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1512         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1513         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1514         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1515         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1516         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1517         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1518         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1519         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1520         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1521         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1522         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1523         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1524         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1525         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1526         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1527         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1528         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1529         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1530         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1531         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1532         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1533         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1534         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1535         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1536         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1537         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1538         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1539         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1540         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1541         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1542         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1543         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1544         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1545
1546         /* new operations for NFSv4.1 */
1547         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_backchannel_ctl,
1548         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1549         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1550         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1551         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1552         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1553         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1554         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1555         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1556         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1557         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1558         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1559         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1560         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1561         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1562         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1563         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1564         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1565         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1566 };
1567
1568 struct nfsd4_minorversion_ops {
1569         nfsd4_dec *decoders;
1570         int nops;
1571 };
1572
1573 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1574         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1575         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1576 };
1577
1578 static __be32
1579 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1580 {
1581         DECODE_HEAD;
1582         struct nfsd4_op *op;
1583         struct nfsd4_minorversion_ops *ops;
1584         bool cachethis = false;
1585         int i;
1586
1587         READ_BUF(4);
1588         READ32(argp->taglen);
1589         READ_BUF(argp->taglen + 8);
1590         SAVEMEM(argp->tag, argp->taglen);
1591         READ32(argp->minorversion);
1592         READ32(argp->opcnt);
1593
1594         if (argp->taglen > NFSD4_MAX_TAGLEN)
1595                 goto xdr_error;
1596         if (argp->opcnt > 100)
1597                 goto xdr_error;
1598
1599         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1600                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1601                 if (!argp->ops) {
1602                         argp->ops = argp->iops;
1603                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1604                         goto xdr_error;
1605                 }
1606         }
1607
1608         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1609                 argp->opcnt = 0;
1610
1611         ops = &nfsd4_minorversion[argp->minorversion];
1612         for (i = 0; i < argp->opcnt; i++) {
1613                 op = &argp->ops[i];
1614                 op->replay = NULL;
1615
1616                 READ_BUF(4);
1617                 READ32(op->opnum);
1618
1619                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1620                         op->status = ops->decoders[op->opnum](argp, &op->u);
1621                 else {
1622                         op->opnum = OP_ILLEGAL;
1623                         op->status = nfserr_op_illegal;
1624                 }
1625
1626                 if (op->status) {
1627                         argp->opcnt = i+1;
1628                         break;
1629                 }
1630                 /*
1631                  * We'll try to cache the result in the DRC if any one
1632                  * op in the compound wants to be cached:
1633                  */
1634                 cachethis |= nfsd4_cache_this_op(op);
1635         }
1636         /* Sessions make the DRC unnecessary: */
1637         if (argp->minorversion)
1638                 cachethis = false;
1639         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1640
1641         DECODE_TAIL;
1642 }
1643
1644 #define WRITE32(n)               *p++ = htonl(n)
1645 #define WRITE64(n)               do {                           \
1646         *p++ = htonl((u32)((n) >> 32));                         \
1647         *p++ = htonl((u32)(n));                                 \
1648 } while (0)
1649 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1650         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1651         memcpy(p, ptr, nbytes);                                 \
1652         p += XDR_QUADLEN(nbytes);                               \
1653 }} while (0)
1654
1655 static void write32(__be32 **p, u32 n)
1656 {
1657         *(*p)++ = htonl(n);
1658 }
1659
1660 static void write64(__be32 **p, u64 n)
1661 {
1662         write32(p, (n >> 32));
1663         write32(p, (u32)n);
1664 }
1665
1666 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1667 {
1668         if (IS_I_VERSION(inode)) {
1669                 write64(p, inode->i_version);
1670         } else {
1671                 write32(p, stat->ctime.tv_sec);
1672                 write32(p, stat->ctime.tv_nsec);
1673         }
1674 }
1675
1676 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1677 {
1678         write32(p, c->atomic);
1679         if (c->change_supported) {
1680                 write64(p, c->before_change);
1681                 write64(p, c->after_change);
1682         } else {
1683                 write32(p, c->before_ctime_sec);
1684                 write32(p, c->before_ctime_nsec);
1685                 write32(p, c->after_ctime_sec);
1686                 write32(p, c->after_ctime_nsec);
1687         }
1688 }
1689
1690 #define RESERVE_SPACE(nbytes)   do {                            \
1691         p = resp->p;                                            \
1692         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1693 } while (0)
1694 #define ADJUST_ARGS()           resp->p = p
1695
1696 /*
1697  * Header routine to setup seqid operation replay cache
1698  */
1699 #define ENCODE_SEQID_OP_HEAD                                    \
1700         __be32 *save;                                           \
1701                                                                 \
1702         save = resp->p;
1703
1704 /*
1705  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1706  * is where sequence id's are incremented, and the replay cache is filled.
1707  * Note that we increment sequence id's here, at the last moment, so we're sure
1708  * we know whether the error to be returned is a sequence id mutating error.
1709  */
1710
1711 static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1712 {
1713         struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1714
1715         if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1716                 stateowner->so_seqid++;
1717                 stateowner->so_replay.rp_status = nfserr;
1718                 stateowner->so_replay.rp_buflen =
1719                           (char *)resp->p - (char *)save;
1720                 memcpy(stateowner->so_replay.rp_buf, save,
1721                         stateowner->so_replay.rp_buflen);
1722                 nfsd4_purge_closed_stateid(stateowner);
1723         }
1724 }
1725
1726 /* Encode as an array of strings the string given with components
1727  * separated @sep, escaped with esc_enter and esc_exit.
1728  */
1729 static __be32 nfsd4_encode_components_esc(char sep, char *components,
1730                                    __be32 **pp, int *buflen,
1731                                    char esc_enter, char esc_exit)
1732 {
1733         __be32 *p = *pp;
1734         __be32 *countp = p;
1735         int strlen, count=0;
1736         char *str, *end, *next;
1737
1738         dprintk("nfsd4_encode_components(%s)\n", components);
1739         if ((*buflen -= 4) < 0)
1740                 return nfserr_resource;
1741         WRITE32(0); /* We will fill this in with @count later */
1742         end = str = components;
1743         while (*end) {
1744                 bool found_esc = false;
1745
1746                 /* try to parse as esc_start, ..., esc_end, sep */
1747                 if (*str == esc_enter) {
1748                         for (; *end && (*end != esc_exit); end++)
1749                                 /* find esc_exit or end of string */;
1750                         next = end + 1;
1751                         if (*end && (!*next || *next == sep)) {
1752                                 str++;
1753                                 found_esc = true;
1754                         }
1755                 }
1756
1757                 if (!found_esc)
1758                         for (; *end && (*end != sep); end++)
1759                                 /* find sep or end of string */;
1760
1761                 strlen = end - str;
1762                 if (strlen) {
1763                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1764                                 return nfserr_resource;
1765                         WRITE32(strlen);
1766                         WRITEMEM(str, strlen);
1767                         count++;
1768                 }
1769                 else
1770                         end++;
1771                 str = end;
1772         }
1773         *pp = p;
1774         p = countp;
1775         WRITE32(count);
1776         return 0;
1777 }
1778
1779 /* Encode as an array of strings the string given with components
1780  * separated @sep.
1781  */
1782 static __be32 nfsd4_encode_components(char sep, char *components,
1783                                    __be32 **pp, int *buflen)
1784 {
1785         return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1786 }
1787
1788 /*
1789  * encode a location element of a fs_locations structure
1790  */
1791 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1792                                     __be32 **pp, int *buflen)
1793 {
1794         __be32 status;
1795         __be32 *p = *pp;
1796
1797         status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1798                                                 '[', ']');
1799         if (status)
1800                 return status;
1801         status = nfsd4_encode_components('/', location->path, &p, buflen);
1802         if (status)
1803                 return status;
1804         *pp = p;
1805         return 0;
1806 }
1807
1808 /*
1809  * Encode a path in RFC3530 'pathname4' format
1810  */
1811 static __be32 nfsd4_encode_path(const struct path *root,
1812                 const struct path *path, __be32 **pp, int *buflen)
1813 {
1814         struct path cur = {
1815                 .mnt = path->mnt,
1816                 .dentry = path->dentry,
1817         };
1818         __be32 *p = *pp;
1819         struct dentry **components = NULL;
1820         unsigned int ncomponents = 0;
1821         __be32 err = nfserr_jukebox;
1822
1823         dprintk("nfsd4_encode_components(");
1824
1825         path_get(&cur);
1826         /* First walk the path up to the nfsd root, and store the
1827          * dentries/path components in an array.
1828          */
1829         for (;;) {
1830                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1831                         break;
1832                 if (cur.dentry == cur.mnt->mnt_root) {
1833                         if (follow_up(&cur))
1834                                 continue;
1835                         goto out_free;
1836                 }
1837                 if ((ncomponents & 15) == 0) {
1838                         struct dentry **new;
1839                         new = krealloc(components,
1840                                         sizeof(*new) * (ncomponents + 16),
1841                                         GFP_KERNEL);
1842                         if (!new)
1843                                 goto out_free;
1844                         components = new;
1845                 }
1846                 components[ncomponents++] = cur.dentry;
1847                 cur.dentry = dget_parent(cur.dentry);
1848         }
1849
1850         *buflen -= 4;
1851         if (*buflen < 0)
1852                 goto out_free;
1853         WRITE32(ncomponents);
1854
1855         while (ncomponents) {
1856                 struct dentry *dentry = components[ncomponents - 1];
1857                 unsigned int len = dentry->d_name.len;
1858
1859                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1860                 if (*buflen < 0)
1861                         goto out_free;
1862                 WRITE32(len);
1863                 WRITEMEM(dentry->d_name.name, len);
1864                 dprintk("/%s", dentry->d_name.name);
1865                 dput(dentry);
1866                 ncomponents--;
1867         }
1868
1869         *pp = p;
1870         err = 0;
1871 out_free:
1872         dprintk(")\n");
1873         while (ncomponents)
1874                 dput(components[--ncomponents]);
1875         kfree(components);
1876         path_put(&cur);
1877         return err;
1878 }
1879
1880 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1881                 const struct path *path, __be32 **pp, int *buflen)
1882 {
1883         struct svc_export *exp_ps;
1884         __be32 res;
1885
1886         exp_ps = rqst_find_fsidzero_export(rqstp);
1887         if (IS_ERR(exp_ps))
1888                 return nfserrno(PTR_ERR(exp_ps));
1889         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1890         exp_put(exp_ps);
1891         return res;
1892 }
1893
1894 /*
1895  *  encode a fs_locations structure
1896  */
1897 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1898                                      struct svc_export *exp,
1899                                      __be32 **pp, int *buflen)
1900 {
1901         __be32 status;
1902         int i;
1903         __be32 *p = *pp;
1904         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1905
1906         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1907         if (status)
1908                 return status;
1909         if ((*buflen -= 4) < 0)
1910                 return nfserr_resource;
1911         WRITE32(fslocs->locations_count);
1912         for (i=0; i<fslocs->locations_count; i++) {
1913                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1914                                                    &p, buflen);
1915                 if (status)
1916                         return status;
1917         }
1918         *pp = p;
1919         return 0;
1920 }
1921
1922 static u32 nfs4_file_type(umode_t mode)
1923 {
1924         switch (mode & S_IFMT) {
1925         case S_IFIFO:   return NF4FIFO;
1926         case S_IFCHR:   return NF4CHR;
1927         case S_IFDIR:   return NF4DIR;
1928         case S_IFBLK:   return NF4BLK;
1929         case S_IFLNK:   return NF4LNK;
1930         case S_IFREG:   return NF4REG;
1931         case S_IFSOCK:  return NF4SOCK;
1932         default:        return NF4BAD;
1933         };
1934 }
1935
1936 static __be32
1937 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, kuid_t uid, kgid_t gid,
1938                         __be32 **p, int *buflen)
1939 {
1940         int status;
1941
1942         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1943                 return nfserr_resource;
1944         if (whotype != NFS4_ACL_WHO_NAMED)
1945                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1946         else if (gid_valid(gid))
1947                 status = nfsd_map_gid_to_name(rqstp, gid, (u8 *)(*p + 1));
1948         else
1949                 status = nfsd_map_uid_to_name(rqstp, uid, (u8 *)(*p + 1));
1950         if (status < 0)
1951                 return nfserrno(status);
1952         *p = xdr_encode_opaque(*p, NULL, status);
1953         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1954         BUG_ON(*buflen < 0);
1955         return 0;
1956 }
1957
1958 static inline __be32
1959 nfsd4_encode_user(struct svc_rqst *rqstp, kuid_t user, __be32 **p, int *buflen)
1960 {
1961         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, user, INVALID_GID,
1962                                  p, buflen);
1963 }
1964
1965 static inline __be32
1966 nfsd4_encode_group(struct svc_rqst *rqstp, kgid_t group, __be32 **p, int *buflen)
1967 {
1968         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, INVALID_UID, group,
1969                                  p, buflen);
1970 }
1971
1972 static inline __be32
1973 nfsd4_encode_aclname(struct svc_rqst *rqstp, struct nfs4_ace *ace,
1974                 __be32 **p, int *buflen)
1975 {
1976         kuid_t uid = INVALID_UID;
1977         kgid_t gid = INVALID_GID;
1978
1979         if (ace->whotype == NFS4_ACL_WHO_NAMED) {
1980                 if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
1981                         gid = ace->who_gid;
1982                 else
1983                         uid = ace->who_uid;
1984         }
1985         return nfsd4_encode_name(rqstp, ace->whotype, uid, gid, p, buflen);
1986 }
1987
1988 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1989                               FATTR4_WORD0_RDATTR_ERROR)
1990 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1991
1992 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1993 {
1994         /* As per referral draft:  */
1995         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1996             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1997                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1998                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1999                         *rdattr_err = NFSERR_MOVED;
2000                 else
2001                         return nfserr_moved;
2002         }
2003         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2004         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2005         return 0;
2006 }
2007
2008
2009 static int get_parent_attributes(struct svc_export *exp, struct kstat *stat)
2010 {
2011         struct path path = exp->ex_path;
2012         int err;
2013
2014         path_get(&path);
2015         while (follow_up(&path)) {
2016                 if (path.dentry != path.mnt->mnt_root)
2017                         break;
2018         }
2019         err = vfs_getattr(&path, stat);
2020         path_put(&path);
2021         return err;
2022 }
2023
2024 /*
2025  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2026  * ourselves.
2027  *
2028  * countp is the buffer size in _words_
2029  */
2030 __be32
2031 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2032                 struct dentry *dentry, __be32 **buffer, int count, u32 *bmval,
2033                 struct svc_rqst *rqstp, int ignore_crossmnt)
2034 {
2035         u32 bmval0 = bmval[0];
2036         u32 bmval1 = bmval[1];
2037         u32 bmval2 = bmval[2];
2038         struct kstat stat;
2039         struct svc_fh tempfh;
2040         struct kstatfs statfs;
2041         int buflen = count << 2;
2042         __be32 *attrlenp;
2043         u32 dummy;
2044         u64 dummy64;
2045         u32 rdattr_err = 0;
2046         __be32 *p = *buffer;
2047         __be32 status;
2048         int err;
2049         int aclsupport = 0;
2050         struct nfs4_acl *acl = NULL;
2051         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2052         u32 minorversion = resp->cstate.minorversion;
2053         struct path path = {
2054                 .mnt    = exp->ex_path.mnt,
2055                 .dentry = dentry,
2056         };
2057         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2058
2059         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2060         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2061         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2062         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2063
2064         if (exp->ex_fslocs.migrated) {
2065                 BUG_ON(bmval[2]);
2066                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2067                 if (status)
2068                         goto out;
2069         }
2070
2071         err = vfs_getattr(&path, &stat);
2072         if (err)
2073                 goto out_nfserr;
2074         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2075                         FATTR4_WORD0_MAXNAME)) ||
2076             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2077                        FATTR4_WORD1_SPACE_TOTAL))) {
2078                 err = vfs_statfs(&path, &statfs);
2079                 if (err)
2080                         goto out_nfserr;
2081         }
2082         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2083                 fh_init(&tempfh, NFS4_FHSIZE);
2084                 status = fh_compose(&tempfh, exp, dentry, NULL);
2085                 if (status)
2086                         goto out;
2087                 fhp = &tempfh;
2088         }
2089         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2090                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2091                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2092                 aclsupport = (err == 0);
2093                 if (bmval0 & FATTR4_WORD0_ACL) {
2094                         if (err == -EOPNOTSUPP)
2095                                 bmval0 &= ~FATTR4_WORD0_ACL;
2096                         else if (err == -EINVAL) {
2097                                 status = nfserr_attrnotsupp;
2098                                 goto out;
2099                         } else if (err != 0)
2100                                 goto out_nfserr;
2101                 }
2102         }
2103
2104         if (bmval2) {
2105                 if ((buflen -= 16) < 0)
2106                         goto out_resource;
2107                 WRITE32(3);
2108                 WRITE32(bmval0);
2109                 WRITE32(bmval1);
2110                 WRITE32(bmval2);
2111         } else if (bmval1) {
2112                 if ((buflen -= 12) < 0)
2113                         goto out_resource;
2114                 WRITE32(2);
2115                 WRITE32(bmval0);
2116                 WRITE32(bmval1);
2117         } else {
2118                 if ((buflen -= 8) < 0)
2119                         goto out_resource;
2120                 WRITE32(1);
2121                 WRITE32(bmval0);
2122         }
2123         attrlenp = p++;                /* to be backfilled later */
2124
2125         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2126                 u32 word0 = nfsd_suppattrs0(minorversion);
2127                 u32 word1 = nfsd_suppattrs1(minorversion);
2128                 u32 word2 = nfsd_suppattrs2(minorversion);
2129
2130                 if (!aclsupport)
2131                         word0 &= ~FATTR4_WORD0_ACL;
2132                 if (!word2) {
2133                         if ((buflen -= 12) < 0)
2134                                 goto out_resource;
2135                         WRITE32(2);
2136                         WRITE32(word0);
2137                         WRITE32(word1);
2138                 } else {
2139                         if ((buflen -= 16) < 0)
2140                                 goto out_resource;
2141                         WRITE32(3);
2142                         WRITE32(word0);
2143                         WRITE32(word1);
2144                         WRITE32(word2);
2145                 }
2146         }
2147         if (bmval0 & FATTR4_WORD0_TYPE) {
2148                 if ((buflen -= 4) < 0)
2149                         goto out_resource;
2150                 dummy = nfs4_file_type(stat.mode);
2151                 if (dummy == NF4BAD)
2152                         goto out_serverfault;
2153                 WRITE32(dummy);
2154         }
2155         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2156                 if ((buflen -= 4) < 0)
2157                         goto out_resource;
2158                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2159                         WRITE32(NFS4_FH_PERSISTENT);
2160                 else
2161                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2162         }
2163         if (bmval0 & FATTR4_WORD0_CHANGE) {
2164                 if ((buflen -= 8) < 0)
2165                         goto out_resource;
2166                 write_change(&p, &stat, dentry->d_inode);
2167         }
2168         if (bmval0 & FATTR4_WORD0_SIZE) {
2169                 if ((buflen -= 8) < 0)
2170                         goto out_resource;
2171                 WRITE64(stat.size);
2172         }
2173         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2174                 if ((buflen -= 4) < 0)
2175                         goto out_resource;
2176                 WRITE32(1);
2177         }
2178         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2179                 if ((buflen -= 4) < 0)
2180                         goto out_resource;
2181                 WRITE32(1);
2182         }
2183         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2184                 if ((buflen -= 4) < 0)
2185                         goto out_resource;
2186                 WRITE32(0);
2187         }
2188         if (bmval0 & FATTR4_WORD0_FSID) {
2189                 if ((buflen -= 16) < 0)
2190                         goto out_resource;
2191                 if (exp->ex_fslocs.migrated) {
2192                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2193                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2194                 } else switch(fsid_source(fhp)) {
2195                 case FSIDSOURCE_FSID:
2196                         WRITE64((u64)exp->ex_fsid);
2197                         WRITE64((u64)0);
2198                         break;
2199                 case FSIDSOURCE_DEV:
2200                         WRITE32(0);
2201                         WRITE32(MAJOR(stat.dev));
2202                         WRITE32(0);
2203                         WRITE32(MINOR(stat.dev));
2204                         break;
2205                 case FSIDSOURCE_UUID:
2206                         WRITEMEM(exp->ex_uuid, 16);
2207                         break;
2208                 }
2209         }
2210         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2211                 if ((buflen -= 4) < 0)
2212                         goto out_resource;
2213                 WRITE32(0);
2214         }
2215         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2216                 if ((buflen -= 4) < 0)
2217                         goto out_resource;
2218                 WRITE32(nn->nfsd4_lease);
2219         }
2220         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2221                 if ((buflen -= 4) < 0)
2222                         goto out_resource;
2223                 WRITE32(rdattr_err);
2224         }
2225         if (bmval0 & FATTR4_WORD0_ACL) {
2226                 struct nfs4_ace *ace;
2227
2228                 if (acl == NULL) {
2229                         if ((buflen -= 4) < 0)
2230                                 goto out_resource;
2231
2232                         WRITE32(0);
2233                         goto out_acl;
2234                 }
2235                 if ((buflen -= 4) < 0)
2236                         goto out_resource;
2237                 WRITE32(acl->naces);
2238
2239                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2240                         if ((buflen -= 4*3) < 0)
2241                                 goto out_resource;
2242                         WRITE32(ace->type);
2243                         WRITE32(ace->flag);
2244                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2245                         status = nfsd4_encode_aclname(rqstp, ace, &p, &buflen);
2246                         if (status == nfserr_resource)
2247                                 goto out_resource;
2248                         if (status)
2249                                 goto out;
2250                 }
2251         }
2252 out_acl:
2253         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2254                 if ((buflen -= 4) < 0)
2255                         goto out_resource;
2256                 WRITE32(aclsupport ?
2257                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2258         }
2259         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2260                 if ((buflen -= 4) < 0)
2261                         goto out_resource;
2262                 WRITE32(1);
2263         }
2264         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2265                 if ((buflen -= 4) < 0)
2266                         goto out_resource;
2267                 WRITE32(0);
2268         }
2269         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2270                 if ((buflen -= 4) < 0)
2271                         goto out_resource;
2272                 WRITE32(1);
2273         }
2274         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2275                 if ((buflen -= 4) < 0)
2276                         goto out_resource;
2277                 WRITE32(1);
2278         }
2279         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2280                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2281                 if (buflen < 0)
2282                         goto out_resource;
2283                 WRITE32(fhp->fh_handle.fh_size);
2284                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2285         }
2286         if (bmval0 & FATTR4_WORD0_FILEID) {
2287                 if ((buflen -= 8) < 0)
2288                         goto out_resource;
2289                 WRITE64(stat.ino);
2290         }
2291         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2292                 if ((buflen -= 8) < 0)
2293                         goto out_resource;
2294                 WRITE64((u64) statfs.f_ffree);
2295         }
2296         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2297                 if ((buflen -= 8) < 0)
2298                         goto out_resource;
2299                 WRITE64((u64) statfs.f_ffree);
2300         }
2301         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2302                 if ((buflen -= 8) < 0)
2303                         goto out_resource;
2304                 WRITE64((u64) statfs.f_files);
2305         }
2306         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2307                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2308                 if (status == nfserr_resource)
2309                         goto out_resource;
2310                 if (status)
2311                         goto out;
2312         }
2313         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2314                 if ((buflen -= 4) < 0)
2315                         goto out_resource;
2316                 WRITE32(1);
2317         }
2318         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2319                 if ((buflen -= 8) < 0)
2320                         goto out_resource;
2321                 WRITE64(~(u64)0);
2322         }
2323         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2324                 if ((buflen -= 4) < 0)
2325                         goto out_resource;
2326                 WRITE32(255);
2327         }
2328         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2329                 if ((buflen -= 4) < 0)
2330                         goto out_resource;
2331                 WRITE32(statfs.f_namelen);
2332         }
2333         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2334                 if ((buflen -= 8) < 0)
2335                         goto out_resource;
2336                 WRITE64((u64) svc_max_payload(rqstp));
2337         }
2338         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2339                 if ((buflen -= 8) < 0)
2340                         goto out_resource;
2341                 WRITE64((u64) svc_max_payload(rqstp));
2342         }
2343         if (bmval1 & FATTR4_WORD1_MODE) {
2344                 if ((buflen -= 4) < 0)
2345                         goto out_resource;
2346                 WRITE32(stat.mode & S_IALLUGO);
2347         }
2348         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2349                 if ((buflen -= 4) < 0)
2350                         goto out_resource;
2351                 WRITE32(1);
2352         }
2353         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2354                 if ((buflen -= 4) < 0)
2355                         goto out_resource;
2356                 WRITE32(stat.nlink);
2357         }
2358         if (bmval1 & FATTR4_WORD1_OWNER) {
2359                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2360                 if (status == nfserr_resource)
2361                         goto out_resource;
2362                 if (status)
2363                         goto out;
2364         }
2365         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2366                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2367                 if (status == nfserr_resource)
2368                         goto out_resource;
2369                 if (status)
2370                         goto out;
2371         }
2372         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2373                 if ((buflen -= 8) < 0)
2374                         goto out_resource;
2375                 WRITE32((u32) MAJOR(stat.rdev));
2376                 WRITE32((u32) MINOR(stat.rdev));
2377         }
2378         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2379                 if ((buflen -= 8) < 0)
2380                         goto out_resource;
2381                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2382                 WRITE64(dummy64);
2383         }
2384         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2385                 if ((buflen -= 8) < 0)
2386                         goto out_resource;
2387                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2388                 WRITE64(dummy64);
2389         }
2390         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2391                 if ((buflen -= 8) < 0)
2392                         goto out_resource;
2393                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2394                 WRITE64(dummy64);
2395         }
2396         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2397                 if ((buflen -= 8) < 0)
2398                         goto out_resource;
2399                 dummy64 = (u64)stat.blocks << 9;
2400                 WRITE64(dummy64);
2401         }
2402         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2403                 if ((buflen -= 12) < 0)
2404                         goto out_resource;
2405                 WRITE32(0);
2406                 WRITE32(stat.atime.tv_sec);
2407                 WRITE32(stat.atime.tv_nsec);
2408         }
2409         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2410                 if ((buflen -= 12) < 0)
2411                         goto out_resource;
2412                 WRITE32(0);
2413                 WRITE32(1);
2414                 WRITE32(0);
2415         }
2416         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2417                 if ((buflen -= 12) < 0)
2418                         goto out_resource;
2419                 WRITE32(0);
2420                 WRITE32(stat.ctime.tv_sec);
2421                 WRITE32(stat.ctime.tv_nsec);
2422         }
2423         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2424                 if ((buflen -= 12) < 0)
2425                         goto out_resource;
2426                 WRITE32(0);
2427                 WRITE32(stat.mtime.tv_sec);
2428                 WRITE32(stat.mtime.tv_nsec);
2429         }
2430         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2431                 if ((buflen -= 8) < 0)
2432                         goto out_resource;
2433                 /*
2434                  * Get parent's attributes if not ignoring crossmount
2435                  * and this is the root of a cross-mounted filesystem.
2436                  */
2437                 if (ignore_crossmnt == 0 &&
2438                     dentry == exp->ex_path.mnt->mnt_root)
2439                         get_parent_attributes(exp, &stat);
2440                 WRITE64(stat.ino);
2441         }
2442         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2443                 WRITE32(3);
2444                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2445                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2446                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2447         }
2448
2449         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2450         *buffer = p;
2451         status = nfs_ok;
2452
2453 out:
2454         kfree(acl);
2455         if (fhp == &tempfh)
2456                 fh_put(&tempfh);
2457         return status;
2458 out_nfserr:
2459         status = nfserrno(err);
2460         goto out;
2461 out_resource:
2462         status = nfserr_resource;
2463         goto out;
2464 out_serverfault:
2465         status = nfserr_serverfault;
2466         goto out;
2467 }
2468
2469 static inline int attributes_need_mount(u32 *bmval)
2470 {
2471         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2472                 return 1;
2473         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2474                 return 1;
2475         return 0;
2476 }
2477
2478 static __be32
2479 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2480                 const char *name, int namlen, __be32 **p, int buflen)
2481 {
2482         struct svc_export *exp = cd->rd_fhp->fh_export;
2483         struct dentry *dentry;
2484         __be32 nfserr;
2485         int ignore_crossmnt = 0;
2486
2487         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2488         if (IS_ERR(dentry))
2489                 return nfserrno(PTR_ERR(dentry));
2490         if (!dentry->d_inode) {
2491                 /*
2492                  * nfsd_buffered_readdir drops the i_mutex between
2493                  * readdir and calling this callback, leaving a window
2494                  * where this directory entry could have gone away.
2495                  */
2496                 dput(dentry);
2497                 return nfserr_noent;
2498         }
2499
2500         exp_get(exp);
2501         /*
2502          * In the case of a mountpoint, the client may be asking for
2503          * attributes that are only properties of the underlying filesystem
2504          * as opposed to the cross-mounted file system. In such a case,
2505          * we will not follow the cross mount and will fill the attribtutes
2506          * directly from the mountpoint dentry.
2507          */
2508         if (nfsd_mountpoint(dentry, exp)) {
2509                 int err;
2510
2511                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2512                                 && !attributes_need_mount(cd->rd_bmval)) {
2513                         ignore_crossmnt = 1;
2514                         goto out_encode;
2515                 }
2516                 /*
2517                  * Why the heck aren't we just using nfsd_lookup??
2518                  * Different "."/".." handling?  Something else?
2519                  * At least, add a comment here to explain....
2520                  */
2521                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2522                 if (err) {
2523                         nfserr = nfserrno(err);
2524                         goto out_put;
2525                 }
2526                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2527                 if (nfserr)
2528                         goto out_put;
2529
2530         }
2531 out_encode:
2532         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2533                                         cd->rd_rqstp, ignore_crossmnt);
2534 out_put:
2535         dput(dentry);
2536         exp_put(exp);
2537         return nfserr;
2538 }
2539
2540 static __be32 *
2541 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2542 {
2543         __be32 *attrlenp;
2544
2545         if (buflen < 6)
2546                 return NULL;
2547         *p++ = htonl(2);
2548         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2549         *p++ = htonl(0);                         /* bmval1 */
2550
2551         attrlenp = p++;
2552         *p++ = nfserr;       /* no htonl */
2553         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2554         return p;
2555 }
2556
2557 static int
2558 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2559                     loff_t offset, u64 ino, unsigned int d_type)
2560 {
2561         struct readdir_cd *ccd = ccdv;
2562         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2563         int buflen;
2564         __be32 *p = cd->buffer;
2565         __be32 *cookiep;
2566         __be32 nfserr = nfserr_toosmall;
2567
2568         /* In nfsv4, "." and ".." never make it onto the wire.. */
2569         if (name && isdotent(name, namlen)) {
2570                 cd->common.err = nfs_ok;
2571                 return 0;
2572         }
2573
2574         if (cd->offset)
2575                 xdr_encode_hyper(cd->offset, (u64) offset);
2576
2577         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2578         if (buflen < 0)
2579                 goto fail;
2580
2581         *p++ = xdr_one;                             /* mark entry present */
2582         cookiep = p;
2583         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2584         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2585
2586         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, &p, buflen);
2587         switch (nfserr) {
2588         case nfs_ok:
2589                 break;
2590         case nfserr_resource:
2591                 nfserr = nfserr_toosmall;
2592                 goto fail;
2593         case nfserr_noent:
2594                 goto skip_entry;
2595         default:
2596                 /*
2597                  * If the client requested the RDATTR_ERROR attribute,
2598                  * we stuff the error code into this attribute
2599                  * and continue.  If this attribute was not requested,
2600                  * then in accordance with the spec, we fail the
2601                  * entire READDIR operation(!)
2602                  */
2603                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2604                         goto fail;
2605                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2606                 if (p == NULL) {
2607                         nfserr = nfserr_toosmall;
2608                         goto fail;
2609                 }
2610         }
2611         cd->buflen -= (p - cd->buffer);
2612         cd->buffer = p;
2613         cd->offset = cookiep;
2614 skip_entry:
2615         cd->common.err = nfs_ok;
2616         return 0;
2617 fail:
2618         cd->common.err = nfserr;
2619         return -EINVAL;
2620 }
2621
2622 static void
2623 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2624 {
2625         __be32 *p;
2626
2627         RESERVE_SPACE(sizeof(stateid_t));
2628         WRITE32(sid->si_generation);
2629         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2630         ADJUST_ARGS();
2631 }
2632
2633 static __be32
2634 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2635 {
2636         __be32 *p;
2637
2638         if (!nfserr) {
2639                 RESERVE_SPACE(8);
2640                 WRITE32(access->ac_supported);
2641                 WRITE32(access->ac_resp_access);
2642                 ADJUST_ARGS();
2643         }
2644         return nfserr;
2645 }
2646
2647 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2648 {
2649         __be32 *p;
2650
2651         if (!nfserr) {
2652                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2653                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2654                 WRITE32(bcts->dir);
2655                 /* Sorry, we do not yet support RDMA over 4.1: */
2656                 WRITE32(0);
2657                 ADJUST_ARGS();
2658         }
2659         return nfserr;
2660 }
2661
2662 static __be32
2663 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2664 {
2665         ENCODE_SEQID_OP_HEAD;
2666
2667         if (!nfserr)
2668                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2669
2670         encode_seqid_op_tail(resp, save, nfserr);
2671         return nfserr;
2672 }
2673
2674
2675 static __be32
2676 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2677 {
2678         __be32 *p;
2679
2680         if (!nfserr) {
2681                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2682                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2683                 ADJUST_ARGS();
2684         }
2685         return nfserr;
2686 }
2687
2688 static __be32
2689 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2690 {
2691         __be32 *p;
2692
2693         if (!nfserr) {
2694                 RESERVE_SPACE(32);
2695                 write_cinfo(&p, &create->cr_cinfo);
2696                 WRITE32(2);
2697                 WRITE32(create->cr_bmval[0]);
2698                 WRITE32(create->cr_bmval[1]);
2699                 ADJUST_ARGS();
2700         }
2701         return nfserr;
2702 }
2703
2704 static __be32
2705 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2706 {
2707         struct svc_fh *fhp = getattr->ga_fhp;
2708         int buflen;
2709
2710         if (nfserr)
2711                 return nfserr;
2712
2713         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2714         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2715                                     &resp->p, buflen, getattr->ga_bmval,
2716                                     resp->rqstp, 0);
2717         return nfserr;
2718 }
2719
2720 static __be32
2721 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2722 {
2723         struct svc_fh *fhp = *fhpp;
2724         unsigned int len;
2725         __be32 *p;
2726
2727         if (!nfserr) {
2728                 len = fhp->fh_handle.fh_size;
2729                 RESERVE_SPACE(len + 4);
2730                 WRITE32(len);
2731                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2732                 ADJUST_ARGS();
2733         }
2734         return nfserr;
2735 }
2736
2737 /*
2738 * Including all fields other than the name, a LOCK4denied structure requires
2739 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2740 */
2741 static void
2742 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2743 {
2744         struct xdr_netobj *conf = &ld->ld_owner;
2745         __be32 *p;
2746
2747         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2748         WRITE64(ld->ld_start);
2749         WRITE64(ld->ld_length);
2750         WRITE32(ld->ld_type);
2751         if (conf->len) {
2752                 WRITEMEM(&ld->ld_clientid, 8);
2753                 WRITE32(conf->len);
2754                 WRITEMEM(conf->data, conf->len);
2755                 kfree(conf->data);
2756         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2757                 WRITE64((u64)0); /* clientid */
2758                 WRITE32(0); /* length of owner name */
2759         }
2760         ADJUST_ARGS();
2761 }
2762
2763 static __be32
2764 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2765 {
2766         ENCODE_SEQID_OP_HEAD;
2767
2768         if (!nfserr)
2769                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2770         else if (nfserr == nfserr_denied)
2771                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2772
2773         encode_seqid_op_tail(resp, save, nfserr);
2774         return nfserr;
2775 }
2776
2777 static __be32
2778 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2779 {
2780         if (nfserr == nfserr_denied)
2781                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2782         return nfserr;
2783 }
2784
2785 static __be32
2786 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2787 {
2788         ENCODE_SEQID_OP_HEAD;
2789
2790         if (!nfserr)
2791                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2792
2793         encode_seqid_op_tail(resp, save, nfserr);
2794         return nfserr;
2795 }
2796
2797
2798 static __be32
2799 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2800 {
2801         __be32 *p;
2802
2803         if (!nfserr) {
2804                 RESERVE_SPACE(20);
2805                 write_cinfo(&p, &link->li_cinfo);
2806                 ADJUST_ARGS();
2807         }
2808         return nfserr;
2809 }
2810
2811
2812 static __be32
2813 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2814 {
2815         __be32 *p;
2816         ENCODE_SEQID_OP_HEAD;
2817
2818         if (nfserr)
2819                 goto out;
2820
2821         nfsd4_encode_stateid(resp, &open->op_stateid);
2822         RESERVE_SPACE(40);
2823         write_cinfo(&p, &open->op_cinfo);
2824         WRITE32(open->op_rflags);
2825         WRITE32(2);
2826         WRITE32(open->op_bmval[0]);
2827         WRITE32(open->op_bmval[1]);
2828         WRITE32(open->op_delegate_type);
2829         ADJUST_ARGS();
2830
2831         switch (open->op_delegate_type) {
2832         case NFS4_OPEN_DELEGATE_NONE:
2833                 break;
2834         case NFS4_OPEN_DELEGATE_READ:
2835                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2836                 RESERVE_SPACE(20);
2837                 WRITE32(open->op_recall);
2838
2839                 /*
2840                  * TODO: ACE's in delegations
2841                  */
2842                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2843                 WRITE32(0);
2844                 WRITE32(0);
2845                 WRITE32(0);   /* XXX: is NULL principal ok? */
2846                 ADJUST_ARGS();
2847                 break;
2848         case NFS4_OPEN_DELEGATE_WRITE:
2849                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2850                 RESERVE_SPACE(32);
2851                 WRITE32(0);
2852
2853                 /*
2854                  * TODO: space_limit's in delegations
2855                  */
2856                 WRITE32(NFS4_LIMIT_SIZE);
2857                 WRITE32(~(u32)0);
2858                 WRITE32(~(u32)0);
2859
2860                 /*
2861                  * TODO: ACE's in delegations
2862                  */
2863                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2864                 WRITE32(0);
2865                 WRITE32(0);
2866                 WRITE32(0);   /* XXX: is NULL principal ok? */
2867                 ADJUST_ARGS();
2868                 break;
2869         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2870                 switch (open->op_why_no_deleg) {
2871                 case WND4_CONTENTION:
2872                 case WND4_RESOURCE:
2873                         RESERVE_SPACE(8);
2874                         WRITE32(open->op_why_no_deleg);
2875                         WRITE32(0);     /* deleg signaling not supported yet */
2876                         break;
2877                 default:
2878                         RESERVE_SPACE(4);
2879                         WRITE32(open->op_why_no_deleg);
2880                 }
2881                 ADJUST_ARGS();
2882                 break;
2883         default:
2884                 BUG();
2885         }
2886         /* XXX save filehandle here */
2887 out:
2888         encode_seqid_op_tail(resp, save, nfserr);
2889         return nfserr;
2890 }
2891
2892 static __be32
2893 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2894 {
2895         ENCODE_SEQID_OP_HEAD;
2896
2897         if (!nfserr)
2898                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2899
2900         encode_seqid_op_tail(resp, save, nfserr);
2901         return nfserr;
2902 }
2903
2904 static __be32
2905 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2906 {
2907         ENCODE_SEQID_OP_HEAD;
2908
2909         if (!nfserr)
2910                 nfsd4_encode_stateid(resp, &od->od_stateid);
2911
2912         encode_seqid_op_tail(resp, save, nfserr);
2913         return nfserr;
2914 }
2915
2916 static __be32
2917 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2918                   struct nfsd4_read *read)
2919 {
2920         u32 eof;
2921         int v;
2922         struct page *page;
2923         unsigned long maxcount;
2924         long len;
2925         __be32 *p;
2926
2927         if (nfserr)
2928                 return nfserr;
2929         if (resp->xbuf->page_len)
2930                 return nfserr_resource;
2931
2932         RESERVE_SPACE(8); /* eof flag and byte count */
2933
2934         maxcount = svc_max_payload(resp->rqstp);
2935         if (maxcount > read->rd_length)
2936                 maxcount = read->rd_length;
2937
2938         len = maxcount;
2939         v = 0;
2940         while (len > 0) {
2941                 page = *(resp->rqstp->rq_next_page);
2942                 if (!page) { /* ran out of pages */
2943                         maxcount -= len;
2944                         break;
2945                 }
2946                 resp->rqstp->rq_vec[v].iov_base = page_address(page);
2947                 resp->rqstp->rq_vec[v].iov_len =
2948                         len < PAGE_SIZE ? len : PAGE_SIZE;
2949                 resp->rqstp->rq_next_page++;
2950                 v++;
2951                 len -= PAGE_SIZE;
2952         }
2953         read->rd_vlen = v;
2954
2955         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2956                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2957                         &maxcount);
2958
2959         if (nfserr)
2960                 return nfserr;
2961         eof = (read->rd_offset + maxcount >=
2962                read->rd_fhp->fh_dentry->d_inode->i_size);
2963
2964         WRITE32(eof);
2965         WRITE32(maxcount);
2966         ADJUST_ARGS();
2967         resp->xbuf->head[0].iov_len = (char*)p
2968                                         - (char*)resp->xbuf->head[0].iov_base;
2969         resp->xbuf->page_len = maxcount;
2970
2971         /* Use rest of head for padding and remaining ops: */
2972         resp->xbuf->tail[0].iov_base = p;
2973         resp->xbuf->tail[0].iov_len = 0;
2974         if (maxcount&3) {
2975                 RESERVE_SPACE(4);
2976                 WRITE32(0);
2977                 resp->xbuf->tail[0].iov_base += maxcount&3;
2978                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2979                 ADJUST_ARGS();
2980         }
2981         return 0;
2982 }
2983
2984 static __be32
2985 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2986 {
2987         int maxcount;
2988         char *page;
2989         __be32 *p;
2990
2991         if (nfserr)
2992                 return nfserr;
2993         if (resp->xbuf->page_len)
2994                 return nfserr_resource;
2995         if (!*resp->rqstp->rq_next_page)
2996                 return nfserr_resource;
2997
2998         page = page_address(*(resp->rqstp->rq_next_page++));
2999
3000         maxcount = PAGE_SIZE;
3001         RESERVE_SPACE(4);
3002
3003         /*
3004          * XXX: By default, the ->readlink() VFS op will truncate symlinks
3005          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3006          * not, one easy fix is: if ->readlink() precisely fills the buffer,
3007          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3008          */
3009         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3010         if (nfserr == nfserr_isdir)
3011                 return nfserr_inval;
3012         if (nfserr)
3013                 return nfserr;
3014
3015         WRITE32(maxcount);
3016         ADJUST_ARGS();
3017         resp->xbuf->head[0].iov_len = (char*)p
3018                                 - (char*)resp->xbuf->head[0].iov_base;
3019         resp->xbuf->page_len = maxcount;
3020
3021         /* Use rest of head for padding and remaining ops: */
3022         resp->xbuf->tail[0].iov_base = p;
3023         resp->xbuf->tail[0].iov_len = 0;
3024         if (maxcount&3) {
3025                 RESERVE_SPACE(4);
3026                 WRITE32(0);
3027                 resp->xbuf->tail[0].iov_base += maxcount&3;
3028                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3029                 ADJUST_ARGS();
3030         }
3031         return 0;
3032 }
3033
3034 static __be32
3035 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3036 {
3037         int maxcount;
3038         loff_t offset;
3039         __be32 *page, *savep, *tailbase;
3040         __be32 *p;
3041
3042         if (nfserr)
3043                 return nfserr;
3044         if (resp->xbuf->page_len)
3045                 return nfserr_resource;
3046         if (!*resp->rqstp->rq_next_page)
3047                 return nfserr_resource;
3048
3049         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3050         savep = p;
3051
3052         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3053         WRITE32(0);
3054         WRITE32(0);
3055         ADJUST_ARGS();
3056         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3057         tailbase = p;
3058
3059         maxcount = PAGE_SIZE;
3060         if (maxcount > readdir->rd_maxcount)
3061                 maxcount = readdir->rd_maxcount;
3062
3063         /*
3064          * Convert from bytes to words, account for the two words already
3065          * written, make sure to leave two words at the end for the next
3066          * pointer and eof field.
3067          */
3068         maxcount = (maxcount >> 2) - 4;
3069         if (maxcount < 0) {
3070                 nfserr =  nfserr_toosmall;
3071                 goto err_no_verf;
3072         }
3073
3074         page = page_address(*(resp->rqstp->rq_next_page++));
3075         readdir->common.err = 0;
3076         readdir->buflen = maxcount;
3077         readdir->buffer = page;
3078         readdir->offset = NULL;
3079
3080         offset = readdir->rd_cookie;
3081         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3082                               &offset,
3083                               &readdir->common, nfsd4_encode_dirent);
3084         if (nfserr == nfs_ok &&
3085             readdir->common.err == nfserr_toosmall &&
3086             readdir->buffer == page)
3087                 nfserr = nfserr_toosmall;
3088         if (nfserr)
3089                 goto err_no_verf;
3090
3091         if (readdir->offset)
3092                 xdr_encode_hyper(readdir->offset, offset);
3093
3094         p = readdir->buffer;
3095         *p++ = 0;       /* no more entries */
3096         *p++ = htonl(readdir->common.err == nfserr_eof);
3097         resp->xbuf->page_len = ((char*)p) -
3098                 (char*)page_address(*(resp->rqstp->rq_next_page-1));
3099
3100         /* Use rest of head for padding and remaining ops: */
3101         resp->xbuf->tail[0].iov_base = tailbase;
3102         resp->xbuf->tail[0].iov_len = 0;
3103         resp->p = resp->xbuf->tail[0].iov_base;
3104         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3105
3106         return 0;
3107 err_no_verf:
3108         p = savep;
3109         ADJUST_ARGS();
3110         return nfserr;
3111 }
3112
3113 static __be32
3114 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3115 {
3116         __be32 *p;
3117
3118         if (!nfserr) {
3119                 RESERVE_SPACE(20);
3120                 write_cinfo(&p, &remove->rm_cinfo);
3121                 ADJUST_ARGS();
3122         }
3123         return nfserr;
3124 }
3125
3126 static __be32
3127 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3128 {
3129         __be32 *p;
3130
3131         if (!nfserr) {
3132                 RESERVE_SPACE(40);
3133                 write_cinfo(&p, &rename->rn_sinfo);
3134                 write_cinfo(&p, &rename->rn_tinfo);
3135                 ADJUST_ARGS();
3136         }
3137         return nfserr;
3138 }
3139
3140 static __be32
3141 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3142                          __be32 nfserr,struct svc_export *exp)
3143 {
3144         int i = 0;
3145         u32 nflavs;
3146         struct exp_flavor_info *flavs;
3147         struct exp_flavor_info def_flavs[2];
3148         __be32 *p;
3149
3150         if (nfserr)
3151                 goto out;
3152         if (exp->ex_nflavors) {
3153                 flavs = exp->ex_flavors;
3154                 nflavs = exp->ex_nflavors;
3155         } else { /* Handling of some defaults in absence of real secinfo: */
3156                 flavs = def_flavs;
3157                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3158                         nflavs = 2;
3159                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3160                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3161                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3162                         nflavs = 1;
3163                         flavs[0].pseudoflavor
3164                                         = svcauth_gss_flavor(exp->ex_client);
3165                 } else {
3166                         nflavs = 1;
3167                         flavs[0].pseudoflavor
3168                                         = exp->ex_client->flavour->flavour;
3169                 }
3170         }
3171
3172         RESERVE_SPACE(4);
3173         WRITE32(nflavs);
3174         ADJUST_ARGS();
3175         for (i = 0; i < nflavs; i++) {
3176                 u32 flav = flavs[i].pseudoflavor;
3177                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3178
3179                 if (gm) {
3180                         RESERVE_SPACE(4);
3181                         WRITE32(RPC_AUTH_GSS);
3182                         ADJUST_ARGS();
3183                         RESERVE_SPACE(4 + gm->gm_oid.len);
3184                         WRITE32(gm->gm_oid.len);
3185                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3186                         ADJUST_ARGS();
3187                         RESERVE_SPACE(4);
3188                         WRITE32(0); /* qop */
3189                         ADJUST_ARGS();
3190                         RESERVE_SPACE(4);
3191                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
3192                         ADJUST_ARGS();
3193                         gss_mech_put(gm);
3194                 } else {
3195                         RESERVE_SPACE(4);
3196                         WRITE32(flav);
3197                         ADJUST_ARGS();
3198                 }
3199         }
3200 out:
3201         if (exp)
3202                 exp_put(exp);
3203         return nfserr;
3204 }
3205
3206 static __be32
3207 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3208                      struct nfsd4_secinfo *secinfo)
3209 {
3210         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3211 }
3212
3213 static __be32
3214 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3215                      struct nfsd4_secinfo_no_name *secinfo)
3216 {
3217         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3218 }
3219
3220 /*
3221  * The SETATTR encode routine is special -- it always encodes a bitmap,
3222  * regardless of the error status.
3223  */
3224 static __be32
3225 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3226 {
3227         __be32 *p;
3228
3229         RESERVE_SPACE(12);
3230         if (nfserr) {
3231                 WRITE32(2);
3232                 WRITE32(0);
3233                 WRITE32(0);
3234         }
3235         else {
3236                 WRITE32(2);
3237                 WRITE32(setattr->sa_bmval[0]);
3238                 WRITE32(setattr->sa_bmval[1]);
3239         }
3240         ADJUST_ARGS();
3241         return nfserr;
3242 }
3243
3244 static __be32
3245 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3246 {
3247         __be32 *p;
3248
3249         if (!nfserr) {
3250                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3251                 WRITEMEM(&scd->se_clientid, 8);
3252                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3253                 ADJUST_ARGS();
3254         }
3255         else if (nfserr == nfserr_clid_inuse) {
3256                 RESERVE_SPACE(8);
3257                 WRITE32(0);
3258                 WRITE32(0);
3259                 ADJUST_ARGS();
3260         }
3261         return nfserr;
3262 }
3263
3264 static __be32
3265 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3266 {
3267         __be32 *p;
3268
3269         if (!nfserr) {
3270                 RESERVE_SPACE(16);
3271                 WRITE32(write->wr_bytes_written);
3272                 WRITE32(write->wr_how_written);
3273                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3274                 ADJUST_ARGS();
3275         }
3276         return nfserr;
3277 }
3278
3279 static __be32
3280 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3281                          struct nfsd4_exchange_id *exid)
3282 {
3283         __be32 *p;
3284         char *major_id;
3285         char *server_scope;
3286         int major_id_sz;
3287         int server_scope_sz;
3288         uint64_t minor_id = 0;
3289
3290         if (nfserr)
3291                 return nfserr;
3292
3293         major_id = utsname()->nodename;
3294         major_id_sz = strlen(major_id);
3295         server_scope = utsname()->nodename;
3296         server_scope_sz = strlen(server_scope);
3297
3298         RESERVE_SPACE(
3299                 8 /* eir_clientid */ +
3300                 4 /* eir_sequenceid */ +
3301                 4 /* eir_flags */ +
3302                 4 /* spr_how (SP4_NONE) */ +
3303                 8 /* so_minor_id */ +
3304                 4 /* so_major_id.len */ +
3305                 (XDR_QUADLEN(major_id_sz) * 4) +
3306                 4 /* eir_server_scope.len */ +
3307                 (XDR_QUADLEN(server_scope_sz) * 4) +
3308                 4 /* eir_server_impl_id.count (0) */);
3309
3310         WRITEMEM(&exid->clientid, 8);
3311         WRITE32(exid->seqid);
3312         WRITE32(exid->flags);
3313
3314         /* state_protect4_r. Currently only support SP4_NONE */
3315         BUG_ON(exid->spa_how != SP4_NONE);
3316         WRITE32(exid->spa_how);
3317
3318         /* The server_owner struct */
3319         WRITE64(minor_id);      /* Minor id */
3320         /* major id */
3321         WRITE32(major_id_sz);
3322         WRITEMEM(major_id, major_id_sz);
3323
3324         /* Server scope */
3325         WRITE32(server_scope_sz);
3326         WRITEMEM(server_scope, server_scope_sz);
3327
3328         /* Implementation id */
3329         WRITE32(0);     /* zero length nfs_impl_id4 array */
3330         ADJUST_ARGS();
3331         return 0;
3332 }
3333
3334 static __be32
3335 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3336                             struct nfsd4_create_session *sess)
3337 {
3338         __be32 *p;
3339
3340         if (nfserr)
3341                 return nfserr;
3342
3343         RESERVE_SPACE(24);
3344         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3345         WRITE32(sess->seqid);
3346         WRITE32(sess->flags);
3347         ADJUST_ARGS();
3348
3349         RESERVE_SPACE(28);
3350         WRITE32(0); /* headerpadsz */
3351         WRITE32(sess->fore_channel.maxreq_sz);
3352         WRITE32(sess->fore_channel.maxresp_sz);
3353         WRITE32(sess->fore_channel.maxresp_cached);
3354         WRITE32(sess->fore_channel.maxops);
3355         WRITE32(sess->fore_channel.maxreqs);
3356         WRITE32(sess->fore_channel.nr_rdma_attrs);
3357         ADJUST_ARGS();
3358
3359         if (sess->fore_channel.nr_rdma_attrs) {
3360                 RESERVE_SPACE(4);
3361                 WRITE32(sess->fore_channel.rdma_attrs);
3362                 ADJUST_ARGS();
3363         }
3364
3365         RESERVE_SPACE(28);
3366         WRITE32(0); /* headerpadsz */
3367         WRITE32(sess->back_channel.maxreq_sz);
3368         WRITE32(sess->back_channel.maxresp_sz);
3369         WRITE32(sess->back_channel.maxresp_cached);
3370         WRITE32(sess->back_channel.maxops);
3371         WRITE32(sess->back_channel.maxreqs);
3372         WRITE32(sess->back_channel.nr_rdma_attrs);
3373         ADJUST_ARGS();
3374
3375         if (sess->back_channel.nr_rdma_attrs) {
3376                 RESERVE_SPACE(4);
3377                 WRITE32(sess->back_channel.rdma_attrs);
3378                 ADJUST_ARGS();
3379         }
3380         return 0;
3381 }
3382
3383 static __be32
3384 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3385                              struct nfsd4_destroy_session *destroy_session)
3386 {
3387         return nfserr;
3388 }
3389
3390 static __be32
3391 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3392                           struct nfsd4_free_stateid *free_stateid)
3393 {
3394         __be32 *p;
3395
3396         if (nfserr)
3397                 return nfserr;
3398
3399         RESERVE_SPACE(4);
3400         *p++ = nfserr;
3401         ADJUST_ARGS();
3402         return nfserr;
3403 }
3404
3405 static __be32
3406 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3407                       struct nfsd4_sequence *seq)
3408 {
3409         __be32 *p;
3410
3411         if (nfserr)
3412                 return nfserr;
3413
3414         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3415         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3416         WRITE32(seq->seqid);
3417         WRITE32(seq->slotid);
3418         /* Note slotid's are numbered from zero: */
3419         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3420         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3421         WRITE32(seq->status_flags);
3422
3423         ADJUST_ARGS();
3424         resp->cstate.datap = p; /* DRC cache data pointer */
3425         return 0;
3426 }
3427
3428 static __be32
3429 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3430                           struct nfsd4_test_stateid *test_stateid)
3431 {
3432         struct nfsd4_test_stateid_id *stateid, *next;
3433         __be32 *p;
3434
3435         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3436         *p++ = htonl(test_stateid->ts_num_ids);
3437
3438         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3439                 *p++ = stateid->ts_id_status;
3440         }
3441
3442         ADJUST_ARGS();
3443         return nfserr;
3444 }
3445
3446 static __be32
3447 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3448 {
3449         return nfserr;
3450 }
3451
3452 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3453
3454 /*
3455  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3456  * since we don't need to filter out obsolete ops as this is
3457  * done in the decoding phase.
3458  */
3459 static nfsd4_enc nfsd4_enc_ops[] = {
3460         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3461         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3462         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3463         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3464         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3465         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3466         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3467         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3468         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3469         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3470         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3471         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3472         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3473         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3474         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3475         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3476         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3477         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3478         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3479         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3480         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3481         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3482         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3483         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3484         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3485         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3486         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3487         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3488         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3489         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3490         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3491         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3492         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3493         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3494         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3495         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3496         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3497
3498         /* NFSv4.1 operations */
3499         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3500         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3501         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3502         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3503         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3504         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3505         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3506         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3507         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3508         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3509         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3510         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3511         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3512         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3513         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3514         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3515         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3516         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3517         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3518 };
3519
3520 /*
3521  * Calculate the total amount of memory that the compound response has taken
3522  * after encoding the current operation with pad.
3523  *
3524  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3525  *      which was specified at nfsd4_operation, else pad is zero.
3526  *
3527  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3528  *
3529  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3530  * will be at least a page and will therefore hold the xdr_buf head.
3531  */
3532 __be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3533 {
3534         struct xdr_buf *xb = &resp->rqstp->rq_res;
3535         struct nfsd4_session *session = NULL;
3536         struct nfsd4_slot *slot = resp->cstate.slot;
3537         u32 length, tlen = 0;
3538
3539         if (!nfsd4_has_session(&resp->cstate))
3540                 return 0;
3541
3542         session = resp->cstate.session;
3543         if (session == NULL)
3544                 return 0;
3545
3546         if (xb->page_len == 0) {
3547                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3548         } else {
3549                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3550                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3551
3552                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3553         }
3554         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3555                 length, xb->page_len, tlen, pad);
3556
3557         if (length > session->se_fchannel.maxresp_sz)
3558                 return nfserr_rep_too_big;
3559
3560         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3561             length > session->se_fchannel.maxresp_cached)
3562                 return nfserr_rep_too_big_to_cache;
3563
3564         return 0;
3565 }
3566
3567 void
3568 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3569 {
3570         __be32 *statp;
3571         __be32 *p;
3572
3573         RESERVE_SPACE(8);
3574         WRITE32(op->opnum);
3575         statp = p++;    /* to be backfilled at the end */
3576         ADJUST_ARGS();
3577
3578         if (op->opnum == OP_ILLEGAL)
3579                 goto status;
3580         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3581                !nfsd4_enc_ops[op->opnum]);
3582         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3583         /* nfsd4_check_drc_limit guarantees enough room for error status */
3584         if (!op->status)
3585                 op->status = nfsd4_check_resp_size(resp, 0);
3586 status:
3587         /*
3588          * Note: We write the status directly, instead of using WRITE32(),
3589          * since it is already in network byte order.
3590          */
3591         *statp = op->status;
3592 }
3593
3594 /*
3595  * Encode the reply stored in the stateowner reply cache
3596  *
3597  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3598  * previously sent already encoded operation.
3599  *
3600  * called with nfs4_lock_state() held
3601  */
3602 void
3603 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3604 {
3605         __be32 *p;
3606         struct nfs4_replay *rp = op->replay;
3607
3608         BUG_ON(!rp);
3609
3610         RESERVE_SPACE(8);
3611         WRITE32(op->opnum);
3612         *p++ = rp->rp_status;  /* already xdr'ed */
3613         ADJUST_ARGS();
3614
3615         RESERVE_SPACE(rp->rp_buflen);
3616         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3617         ADJUST_ARGS();
3618 }
3619
3620 int
3621 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3622 {
3623         return xdr_ressize_check(rqstp, p);
3624 }
3625
3626 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3627 {
3628         struct svc_rqst *rqstp = rq;
3629         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3630
3631         if (args->ops != args->iops) {
3632                 kfree(args->ops);
3633                 args->ops = args->iops;
3634         }
3635         kfree(args->tmpp);
3636         args->tmpp = NULL;
3637         while (args->to_free) {
3638                 struct tmpbuf *tb = args->to_free;
3639                 args->to_free = tb->next;
3640                 tb->release(tb->buf);
3641                 kfree(tb);
3642         }
3643         return 1;
3644 }
3645
3646 int
3647 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3648 {
3649         args->p = p;
3650         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3651         args->pagelist = rqstp->rq_arg.pages;
3652         args->pagelen = rqstp->rq_arg.page_len;
3653         args->tmpp = NULL;
3654         args->to_free = NULL;
3655         args->ops = args->iops;
3656         args->rqstp = rqstp;
3657
3658         return !nfsd4_decode_compound(args);
3659 }
3660
3661 int
3662 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3663 {
3664         /*
3665          * All that remains is to write the tag and operation count...
3666          */
3667         struct nfsd4_compound_state *cs = &resp->cstate;
3668         struct kvec *iov;
3669         p = resp->tagp;
3670         *p++ = htonl(resp->taglen);
3671         memcpy(p, resp->tag, resp->taglen);
3672         p += XDR_QUADLEN(resp->taglen);
3673         *p++ = htonl(resp->opcnt);
3674
3675         if (rqstp->rq_res.page_len)
3676                 iov = &rqstp->rq_res.tail[0];
3677         else
3678                 iov = &rqstp->rq_res.head[0];
3679         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3680         BUG_ON(iov->iov_len > PAGE_SIZE);
3681         if (nfsd4_has_session(cs)) {
3682                 if (cs->status != nfserr_replay_cache) {
3683                         nfsd4_store_cache_entry(resp);
3684                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3685                 }
3686                 /* Renew the clientid on success and on replay */
3687                 put_client_renew(cs->session->se_client);
3688                 nfsd4_put_session(cs->session);
3689         }
3690         return 1;
3691 }
3692
3693 /*
3694  * Local variables:
3695  *  c-basic-offset: 8
3696  * End:
3697  */