fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/slab.h>
  44 #include <linux/namei.h>
  45 #include <linux/statfs.h>
  46 #include <linux/utsname.h>
  47 #include <linux/pagemap.h>
  48 #include <linux/sunrpc/svcauth_gss.h>
  49
  50 #include "idmap.h"
  51 #include "acl.h"
  52 #include "xdr4.h"
  53 #include "vfs.h"
  54 #include "state.h"
  55 #include "cache.h"
  56
  57 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  58
  59 /*
  60  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  61  * directory in order to indicate to the client that a filesystem boundary is present
  62  * We use a fixed fsid for a referral
  63  */
  64 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  65 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  66
  67 static __be32
  68 check_filename(char *str, int len, __be32 err)
  69 {
  70         int i;
  71
  72         if (len == 0)
  73                 return nfserr_inval;
  74         if (isdotent(str, len))
  75                 return err;
  76         for (i = 0; i < len; i++)
  77                 if (str[i] == '/')
  78                         return err;
  79         return 0;
  80 }
  81
  82 #define DECODE_HEAD                             \
  83         __be32 *p;                              \
  84         __be32 status
  85 #define DECODE_TAIL                             \
  86         status = 0;                             \
  87 out:                                            \
  88         return status;                          \
  89 xdr_error:                                      \
  90         dprintk("NFSD: xdr error (%s:%d)\n",    \
  91                         __FILE__, __LINE__);    \
  92         status = nfserr_bad_xdr;                \
  93         goto out
  94
  95 #define READ32(x)         (x) = ntohl(*p++)
  96 #define READ64(x)         do {                  \
  97         (x) = (u64)ntohl(*p++) << 32;           \
  98         (x) |= ntohl(*p++);                     \
  99 } while (0)
 100 #define READTIME(x)       do {                  \
 101         p++;                                    \
 102         (x) = ntohl(*p++);                      \
 103         p++;                                    \
 104 } while (0)
 105 #define READMEM(x,nbytes) do {                  \
 106         x = (char *)p;                          \
 107         p += XDR_QUADLEN(nbytes);               \
 108 } while (0)
 109 #define SAVEMEM(x,nbytes) do {                  \
 110         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 111                 savemem(argp, p, nbytes) :      \
 112                 (char *)p)) {                   \
 113                 dprintk("NFSD: xdr error (%s:%d)\n", \
 114                                 __FILE__, __LINE__); \
 115                 goto xdr_error;                 \
 116                 }                               \
 117         p += XDR_QUADLEN(nbytes);               \
 118 } while (0)
 119 #define COPYMEM(x,nbytes) do {                  \
 120         memcpy((x), p, nbytes);                 \
 121         p += XDR_QUADLEN(nbytes);               \
 122 } while (0)
 123
 124 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 125 #define READ_BUF(nbytes)  do {                  \
 126         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 127                 p = argp->p;                    \
 128                 argp->p += XDR_QUADLEN(nbytes); \
 129         } else if (!(p = read_buf(argp, nbytes))) { \
 130                 dprintk("NFSD: xdr error (%s:%d)\n", \
 131                                 __FILE__, __LINE__); \
 132                 goto xdr_error;                 \
 133         }                                       \
 134 } while (0)
 135
 136 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 137 {
 138         /* We want more bytes than seem to be available.
 139          * Maybe we need a new page, maybe we have just run out
 140          */
 141         unsigned int avail = (char *)argp->end - (char *)argp->p;
 142         __be32 *p;
 143         if (avail + argp->pagelen < nbytes)
 144                 return NULL;
 145         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 146                 return NULL;
 147         /* ok, we can do it with the current plus the next page */
 148         if (nbytes <= sizeof(argp->tmp))
 149                 p = argp->tmp;
 150         else {
 151                 kfree(argp->tmpp);
 152                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 153                 if (!p)
 154                         return NULL;
 155
 156         }
 157         /*
 158          * The following memcpy is safe because read_buf is always
 159          * called with nbytes > avail, and the two cases above both
 160          * guarantee p points to at least nbytes bytes.
 161          */
 162         memcpy(p, argp->p, avail);
 163         /* step to next page */
 164         argp->p = page_address(argp->pagelist[0]);
 165         argp->pagelist++;
 166         if (argp->pagelen < PAGE_SIZE) {
 167                 argp->end = argp->p + (argp->pagelen>>2);
 168                 argp->pagelen = 0;
 169         } else {
 170                 argp->end = argp->p + (PAGE_SIZE>>2);
 171                 argp->pagelen -= PAGE_SIZE;
 172         }
 173         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 174         argp->p += XDR_QUADLEN(nbytes - avail);
 175         return p;
 176 }
 177
 178 static int zero_clientid(clientid_t *clid)
 179 {
 180         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 181 }
 182
 183 static int
 184 defer_free(struct nfsd4_compoundargs *argp,
 185                 void (*release)(const void *), void *p)
 186 {
 187         struct tmpbuf *tb;
 188
 189         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 190         if (!tb)
 191                 return -ENOMEM;
 192         tb->buf = p;
 193         tb->release = release;
 194         tb->next = argp->to_free;
 195         argp->to_free = tb;
 196         return 0;
 197 }
 198
 199 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 200 {
 201         if (p == argp->tmp) {
 202                 p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
 203                 if (!p)
 204                         return NULL;
 205         } else {
 206                 BUG_ON(p != argp->tmpp);
 207                 argp->tmpp = NULL;
 208         }
 209         if (defer_free(argp, kfree, p)) {
 210                 kfree(p);
 211                 return NULL;
 212         } else
 213                 return (char *)p;
 214 }
 215
 216 static __be32
 217 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 218 {
 219         u32 bmlen;
 220         DECODE_HEAD;
 221
 222         bmval[0] = 0;
 223         bmval[1] = 0;
 224         bmval[2] = 0;
 225
 226         READ_BUF(4);
 227         READ32(bmlen);
 228         if (bmlen > 1000)
 229                 goto xdr_error;
 230
 231         READ_BUF(bmlen << 2);
 232         if (bmlen > 0)
 233                 READ32(bmval[0]);
 234         if (bmlen > 1)
 235                 READ32(bmval[1]);
 236         if (bmlen > 2)
 237                 READ32(bmval[2]);
 238
 239         DECODE_TAIL;
 240 }
 241
 242 static __be32
 243 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 244                    struct iattr *iattr, struct nfs4_acl **acl)
 245 {
 246         int expected_len, len = 0;
 247         u32 dummy32;
 248         char *buf;
 249         int host_err;
 250
 251         DECODE_HEAD;
 252         iattr->ia_valid = 0;
 253         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 254                 return status;
 255
 256         READ_BUF(4);
 257         READ32(expected_len);
 258
 259         if (bmval[0] & FATTR4_WORD0_SIZE) {
 260                 READ_BUF(8);
 261                 len += 8;
 262                 READ64(iattr->ia_size);
 263                 iattr->ia_valid |= ATTR_SIZE;
 264         }
 265         if (bmval[0] & FATTR4_WORD0_ACL) {
 266                 int nace;
 267                 struct nfs4_ace *ace;
 268
 269                 READ_BUF(4); len += 4;
 270                 READ32(nace);
 271
 272                 if (nace > NFS4_ACL_MAX)
 273                         return nfserr_resource;
 274
 275                 *acl = nfs4_acl_new(nace);
 276                 if (*acl == NULL) {
 277                         host_err = -ENOMEM;
 278                         goto out_nfserr;
 279                 }
 280                 defer_free(argp, kfree, *acl);
 281
 282                 (*acl)->naces = nace;
 283                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 284                         READ_BUF(16); len += 16;
 285                         READ32(ace->type);
 286                         READ32(ace->flag);
 287                         READ32(ace->access_mask);
 288                         READ32(dummy32);
 289                         READ_BUF(dummy32);
 290                         len += XDR_QUADLEN(dummy32) << 2;
 291                         READMEM(buf, dummy32);
 292                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 293                         status = nfs_ok;
 294                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 295                                 ace->who = 0;
 296                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 297                                 status = nfsd_map_name_to_gid(argp->rqstp,
 298                                                 buf, dummy32, &ace->who);
 299                         else
 300                                 status = nfsd_map_name_to_uid(argp->rqstp,
 301                                                 buf, dummy32, &ace->who);
 302                         if (status)
 303                                 return status;
 304                 }
 305         } else
 306                 *acl = NULL;
 307         if (bmval[1] & FATTR4_WORD1_MODE) {
 308                 READ_BUF(4);
 309                 len += 4;
 310                 READ32(iattr->ia_mode);
 311                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 312                 iattr->ia_valid |= ATTR_MODE;
 313         }
 314         if (bmval[1] & FATTR4_WORD1_OWNER) {
 315                 READ_BUF(4);
 316                 len += 4;
 317                 READ32(dummy32);
 318                 READ_BUF(dummy32);
 319                 len += (XDR_QUADLEN(dummy32) << 2);
 320                 READMEM(buf, dummy32);
 321                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 322                         return status;
 323                 iattr->ia_valid |= ATTR_UID;
 324         }
 325         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 326                 READ_BUF(4);
 327                 len += 4;
 328                 READ32(dummy32);
 329                 READ_BUF(dummy32);
 330                 len += (XDR_QUADLEN(dummy32) << 2);
 331                 READMEM(buf, dummy32);
 332                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 333                         return status;
 334                 iattr->ia_valid |= ATTR_GID;
 335         }
 336         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 337                 READ_BUF(4);
 338                 len += 4;
 339                 READ32(dummy32);
 340                 switch (dummy32) {
 341                 case NFS4_SET_TO_CLIENT_TIME:
 342                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 343                            all 32 bits of 'nseconds'. */
 344                         READ_BUF(12);
 345                         len += 12;
 346                         READ32(dummy32);
 347                         if (dummy32)
 348                                 return nfserr_inval;
 349                         READ32(iattr->ia_atime.tv_sec);
 350                         READ32(iattr->ia_atime.tv_nsec);
 351                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 352                                 return nfserr_inval;
 353                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 354                         break;
 355                 case NFS4_SET_TO_SERVER_TIME:
 356                         iattr->ia_valid |= ATTR_ATIME;
 357                         break;
 358                 default:
 359                         goto xdr_error;
 360                 }
 361         }
 362         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 363                 READ_BUF(4);
 364                 len += 4;
 365                 READ32(dummy32);
 366                 switch (dummy32) {
 367                 case NFS4_SET_TO_CLIENT_TIME:
 368                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 369                            all 32 bits of 'nseconds'. */
 370                         READ_BUF(12);
 371                         len += 12;
 372                         READ32(dummy32);
 373                         if (dummy32)
 374                                 return nfserr_inval;
 375                         READ32(iattr->ia_mtime.tv_sec);
 376                         READ32(iattr->ia_mtime.tv_nsec);
 377                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 378                                 return nfserr_inval;
 379                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 380                         break;
 381                 case NFS4_SET_TO_SERVER_TIME:
 382                         iattr->ia_valid |= ATTR_MTIME;
 383                         break;
 384                 default:
 385                         goto xdr_error;
 386                 }
 387         }
 388         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 389             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 390             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 391                 READ_BUF(expected_len - len);
 392         else if (len != expected_len)
 393                 goto xdr_error;
 394
 395         DECODE_TAIL;
 396
 397 out_nfserr:
 398         status = nfserrno(host_err);
 399         goto out;
 400 }
 401
 402 static __be32
 403 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 404 {
 405         DECODE_HEAD;
 406
 407         READ_BUF(sizeof(stateid_t));
 408         READ32(sid->si_generation);
 409         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 410
 411         DECODE_TAIL;
 412 }
 413
 414 static __be32
 415 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 416 {
 417         DECODE_HEAD;
 418
 419         READ_BUF(4);
 420         READ32(access->ac_req_access);
 421
 422         DECODE_TAIL;
 423 }
 424
 425 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 426 {
 427         DECODE_HEAD;
 428
 429         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 430         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 431         READ32(bcts->dir);
 432         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 433          * could help us figure out we should be using it. */
 434         DECODE_TAIL;
 435 }
 436
 437 static __be32
 438 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 439 {
 440         DECODE_HEAD;
 441
 442         READ_BUF(4);
 443         READ32(close->cl_seqid);
 444         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 445
 446         DECODE_TAIL;
 447 }
 448
 449
 450 static __be32
 451 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 452 {
 453         DECODE_HEAD;
 454
 455         READ_BUF(12);
 456         READ64(commit->co_offset);
 457         READ32(commit->co_count);
 458
 459         DECODE_TAIL;
 460 }
 461
 462 static __be32
 463 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 464 {
 465         DECODE_HEAD;
 466
 467         READ_BUF(4);
 468         READ32(create->cr_type);
 469         switch (create->cr_type) {
 470         case NF4LNK:
 471                 READ_BUF(4);
 472                 READ32(create->cr_linklen);
 473                 READ_BUF(create->cr_linklen);
 474                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 475                 break;
 476         case NF4BLK:
 477         case NF4CHR:
 478                 READ_BUF(8);
 479                 READ32(create->cr_specdata1);
 480                 READ32(create->cr_specdata2);
 481                 break;
 482         case NF4SOCK:
 483         case NF4FIFO:
 484         case NF4DIR:
 485         default:
 486                 break;
 487         }
 488
 489         READ_BUF(4);
 490         READ32(create->cr_namelen);
 491         READ_BUF(create->cr_namelen);
 492         SAVEMEM(create->cr_name, create->cr_namelen);
 493         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 494                 return status;
 495
 496         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 497                                     &create->cr_acl);
 498         if (status)
 499                 goto out;
 500
 501         DECODE_TAIL;
 502 }
 503
 504 static inline __be32
 505 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 506 {
 507         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 508 }
 509
 510 static inline __be32
 511 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 512 {
 513         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 514 }
 515
 516 static __be32
 517 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 518 {
 519         DECODE_HEAD;
 520
 521         READ_BUF(4);
 522         READ32(link->li_namelen);
 523         READ_BUF(link->li_namelen);
 524         SAVEMEM(link->li_name, link->li_namelen);
 525         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 526                 return status;
 527
 528         DECODE_TAIL;
 529 }
 530
 531 static __be32
 532 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 533 {
 534         DECODE_HEAD;
 535
 536         /*
 537         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 538         */
 539         READ_BUF(28);
 540         READ32(lock->lk_type);
 541         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 542                 goto xdr_error;
 543         READ32(lock->lk_reclaim);
 544         READ64(lock->lk_offset);
 545         READ64(lock->lk_length);
 546         READ32(lock->lk_is_new);
 547
 548         if (lock->lk_is_new) {
 549                 READ_BUF(4);
 550                 READ32(lock->lk_new_open_seqid);
 551                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 552                 if (status)
 553                         return status;
 554                 READ_BUF(8 + sizeof(clientid_t));
 555                 READ32(lock->lk_new_lock_seqid);
 556                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 557                 READ32(lock->lk_new_owner.len);
 558                 READ_BUF(lock->lk_new_owner.len);
 559                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 560         } else {
 561                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 562                 if (status)
 563                         return status;
 564                 READ_BUF(4);
 565                 READ32(lock->lk_old_lock_seqid);
 566         }
 567
 568         DECODE_TAIL;
 569 }
 570
 571 static __be32
 572 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 573 {
 574         DECODE_HEAD;
 575
 576         READ_BUF(32);
 577         READ32(lockt->lt_type);
 578         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 579                 goto xdr_error;
 580         READ64(lockt->lt_offset);
 581         READ64(lockt->lt_length);
 582         COPYMEM(&lockt->lt_clientid, 8);
 583         READ32(lockt->lt_owner.len);
 584         READ_BUF(lockt->lt_owner.len);
 585         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 586
 587         DECODE_TAIL;
 588 }
 589
 590 static __be32
 591 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 592 {
 593         DECODE_HEAD;
 594
 595         READ_BUF(8);
 596         READ32(locku->lu_type);
 597         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 598                 goto xdr_error;
 599         READ32(locku->lu_seqid);
 600         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 601         if (status)
 602                 return status;
 603         READ_BUF(16);
 604         READ64(locku->lu_offset);
 605         READ64(locku->lu_length);
 606
 607         DECODE_TAIL;
 608 }
 609
 610 static __be32
 611 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 612 {
 613         DECODE_HEAD;
 614
 615         READ_BUF(4);
 616         READ32(lookup->lo_len);
 617         READ_BUF(lookup->lo_len);
 618         SAVEMEM(lookup->lo_name, lookup->lo_len);
 619         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 620                 return status;
 621
 622         DECODE_TAIL;
 623 }
 624
 625 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 626 {
 627         __be32 *p;
 628         u32 w;
 629
 630         READ_BUF(4);
 631         READ32(w);
 632         *share_access = w & NFS4_SHARE_ACCESS_MASK;
 633         *deleg_want = w & NFS4_SHARE_WANT_MASK;
 634         if (deleg_when)
 635                 *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 636
 637         switch (w & NFS4_SHARE_ACCESS_MASK) {
 638         case NFS4_SHARE_ACCESS_READ:
 639         case NFS4_SHARE_ACCESS_WRITE:
 640         case NFS4_SHARE_ACCESS_BOTH:
 641                 break;
 642         default:
 643                 return nfserr_bad_xdr;
 644         }
 645         w &= ~NFS4_SHARE_ACCESS_MASK;
 646         if (!w)
 647                 return nfs_ok;
 648         if (!argp->minorversion)
 649                 return nfserr_bad_xdr;
 650         switch (w & NFS4_SHARE_WANT_MASK) {
 651         case NFS4_SHARE_WANT_NO_PREFERENCE:
 652         case NFS4_SHARE_WANT_READ_DELEG:
 653         case NFS4_SHARE_WANT_WRITE_DELEG:
 654         case NFS4_SHARE_WANT_ANY_DELEG:
 655         case NFS4_SHARE_WANT_NO_DELEG:
 656         case NFS4_SHARE_WANT_CANCEL:
 657                 break;
 658         default:
 659                 return nfserr_bad_xdr;
 660         }
 661         w &= ~NFS4_SHARE_WANT_MASK;
 662         if (!w)
 663                 return nfs_ok;
 664
 665         if (!deleg_when)        /* open_downgrade */
 666                 return nfserr_inval;
 667         switch (w) {
 668         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 669         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 670         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 671               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 672                 return nfs_ok;
 673         }
 674 xdr_error:
 675         return nfserr_bad_xdr;
 676 }
 677
 678 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 679 {
 680         __be32 *p;
 681
 682         READ_BUF(4);
 683         READ32(*x);
 684         /* Note: unlinke access bits, deny bits may be zero. */
 685         if (*x & ~NFS4_SHARE_DENY_BOTH)
 686                 return nfserr_bad_xdr;
 687         return nfs_ok;
 688 xdr_error:
 689         return nfserr_bad_xdr;
 690 }
 691
 692 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 693 {
 694         __be32 *p;
 695
 696         READ_BUF(4);
 697         READ32(o->len);
 698
 699         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 700                 return nfserr_bad_xdr;
 701
 702         READ_BUF(o->len);
 703         SAVEMEM(o->data, o->len);
 704         return nfs_ok;
 705 xdr_error:
 706         return nfserr_bad_xdr;
 707 }
 708
 709 static __be32
 710 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 711 {
 712         DECODE_HEAD;
 713         u32 dummy;
 714
 715         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 716         open->op_iattr.ia_valid = 0;
 717         open->op_openowner = NULL;
 718
 719         /* seqid, share_access, share_deny, clientid, ownerlen */
 720         READ_BUF(4);
 721         READ32(open->op_seqid);
 722         /* decode, yet ignore deleg_when until supported */
 723         status = nfsd4_decode_share_access(argp, &open->op_share_access,
 724                                            &open->op_deleg_want, &dummy);
 725         if (status)
 726                 goto xdr_error;
 727         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 728         if (status)
 729                 goto xdr_error;
 730         READ_BUF(sizeof(clientid_t));
 731         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 732         status = nfsd4_decode_opaque(argp, &open->op_owner);
 733         if (status)
 734                 goto xdr_error;
 735         READ_BUF(4);
 736         READ32(open->op_create);
 737         switch (open->op_create) {
 738         case NFS4_OPEN_NOCREATE:
 739                 break;
 740         case NFS4_OPEN_CREATE:
 741                 READ_BUF(4);
 742                 READ32(open->op_createmode);
 743                 switch (open->op_createmode) {
 744                 case NFS4_CREATE_UNCHECKED:
 745                 case NFS4_CREATE_GUARDED:
 746                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 747                                 &open->op_iattr, &open->op_acl);
 748                         if (status)
 749                                 goto out;
 750                         break;
 751                 case NFS4_CREATE_EXCLUSIVE:
 752                         READ_BUF(NFS4_VERIFIER_SIZE);
 753                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 754                         break;
 755                 case NFS4_CREATE_EXCLUSIVE4_1:
 756                         if (argp->minorversion < 1)
 757                                 goto xdr_error;
 758                         READ_BUF(NFS4_VERIFIER_SIZE);
 759                         COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 760                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 761                                 &open->op_iattr, &open->op_acl);
 762                         if (status)
 763                                 goto out;
 764                         break;
 765                 default:
 766                         goto xdr_error;
 767                 }
 768                 break;
 769         default:
 770                 goto xdr_error;
 771         }
 772
 773         /* open_claim */
 774         READ_BUF(4);
 775         READ32(open->op_claim_type);
 776         switch (open->op_claim_type) {
 777         case NFS4_OPEN_CLAIM_NULL:
 778         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 779                 READ_BUF(4);
 780                 READ32(open->op_fname.len);
 781                 READ_BUF(open->op_fname.len);
 782                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 783                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 784                         return status;
 785                 break;
 786         case NFS4_OPEN_CLAIM_PREVIOUS:
 787                 READ_BUF(4);
 788                 READ32(open->op_delegate_type);
 789                 break;
 790         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 791                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 792                 if (status)
 793                         return status;
 794                 READ_BUF(4);
 795                 READ32(open->op_fname.len);
 796                 READ_BUF(open->op_fname.len);
 797                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 798                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 799                         return status;
 800                 break;
 801         case NFS4_OPEN_CLAIM_FH:
 802         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 803                 if (argp->minorversion < 1)
 804                         goto xdr_error;
 805                 /* void */
 806                 break;
 807         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 808                 if (argp->minorversion < 1)
 809                         goto xdr_error;
 810                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 811                 if (status)
 812                         return status;
 813                 break;
 814         default:
 815                 goto xdr_error;
 816         }
 817
 818         DECODE_TAIL;
 819 }
 820
 821 static __be32
 822 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 823 {
 824         DECODE_HEAD;
 825
 826         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 827         if (status)
 828                 return status;
 829         READ_BUF(4);
 830         READ32(open_conf->oc_seqid);
 831
 832         DECODE_TAIL;
 833 }
 834
 835 static __be32
 836 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 837 {
 838         DECODE_HEAD;
 839
 840         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 841         if (status)
 842                 return status;
 843         READ_BUF(4);
 844         READ32(open_down->od_seqid);
 845         status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 846                                            &open_down->od_deleg_want, NULL);
 847         if (status)
 848                 return status;
 849         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 850         if (status)
 851                 return status;
 852         DECODE_TAIL;
 853 }
 854
 855 static __be32
 856 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 857 {
 858         DECODE_HEAD;
 859
 860         READ_BUF(4);
 861         READ32(putfh->pf_fhlen);
 862         if (putfh->pf_fhlen > NFS4_FHSIZE)
 863                 goto xdr_error;
 864         READ_BUF(putfh->pf_fhlen);
 865         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 866
 867         DECODE_TAIL;
 868 }
 869
 870 static __be32
 871 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 872 {
 873         DECODE_HEAD;
 874
 875         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 876         if (status)
 877                 return status;
 878         READ_BUF(12);
 879         READ64(read->rd_offset);
 880         READ32(read->rd_length);
 881
 882         DECODE_TAIL;
 883 }
 884
 885 static __be32
 886 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 887 {
 888         DECODE_HEAD;
 889
 890         READ_BUF(24);
 891         READ64(readdir->rd_cookie);
 892         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 893         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 894         READ32(readdir->rd_maxcount);
 895         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 896                 goto out;
 897
 898         DECODE_TAIL;
 899 }
 900
 901 static __be32
 902 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 903 {
 904         DECODE_HEAD;
 905
 906         READ_BUF(4);
 907         READ32(remove->rm_namelen);
 908         READ_BUF(remove->rm_namelen);
 909         SAVEMEM(remove->rm_name, remove->rm_namelen);
 910         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 911                 return status;
 912
 913         DECODE_TAIL;
 914 }
 915
 916 static __be32
 917 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 918 {
 919         DECODE_HEAD;
 920
 921         READ_BUF(4);
 922         READ32(rename->rn_snamelen);
 923         READ_BUF(rename->rn_snamelen + 4);
 924         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 925         READ32(rename->rn_tnamelen);
 926         READ_BUF(rename->rn_tnamelen);
 927         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 928         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 929                 return status;
 930         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 931                 return status;
 932
 933         DECODE_TAIL;
 934 }
 935
 936 static __be32
 937 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 938 {
 939         DECODE_HEAD;
 940
 941         READ_BUF(sizeof(clientid_t));
 942         COPYMEM(clientid, sizeof(clientid_t));
 943
 944         DECODE_TAIL;
 945 }
 946
 947 static __be32
 948 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 949                      struct nfsd4_secinfo *secinfo)
 950 {
 951         DECODE_HEAD;
 952
 953         READ_BUF(4);
 954         READ32(secinfo->si_namelen);
 955         READ_BUF(secinfo->si_namelen);
 956         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 957         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 958                                                                 nfserr_noent);
 959         if (status)
 960                 return status;
 961         DECODE_TAIL;
 962 }
 963
 964 static __be32
 965 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
 966                      struct nfsd4_secinfo_no_name *sin)
 967 {
 968         DECODE_HEAD;
 969
 970         READ_BUF(4);
 971         READ32(sin->sin_style);
 972         DECODE_TAIL;
 973 }
 974
 975 static __be32
 976 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 977 {
 978         __be32 status;
 979
 980         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 981         if (status)
 982                 return status;
 983         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 984                                   &setattr->sa_acl);
 985 }
 986
 987 static __be32
 988 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 989 {
 990         DECODE_HEAD;
 991
 992         READ_BUF(NFS4_VERIFIER_SIZE);
 993         COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
 994
 995         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
 996         if (status)
 997                 return nfserr_bad_xdr;
 998         READ_BUF(8);
 999         READ32(setclientid->se_callback_prog);
1000         READ32(setclientid->se_callback_netid_len);
1001
1002         READ_BUF(setclientid->se_callback_netid_len + 4);
1003         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1004         READ32(setclientid->se_callback_addr_len);
1005
1006         READ_BUF(setclientid->se_callback_addr_len + 4);
1007         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1008         READ32(setclientid->se_callback_ident);
1009
1010         DECODE_TAIL;
1011 }
1012
1013 static __be32
1014 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1015 {
1016         DECODE_HEAD;
1017
1018         READ_BUF(8 + NFS4_VERIFIER_SIZE);
1019         COPYMEM(&scd_c->sc_clientid, 8);
1020         COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1021
1022         DECODE_TAIL;
1023 }
1024
1025 /* Also used for NVERIFY */
1026 static __be32
1027 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1028 {
1029 #if 0
1030         struct nfsd4_compoundargs save = {
1031                 .p = argp->p,
1032                 .end = argp->end,
1033                 .rqstp = argp->rqstp,
1034         };
1035         u32             ve_bmval[2];
1036         struct iattr    ve_iattr;           /* request */
1037         struct nfs4_acl *ve_acl;            /* request */
1038 #endif
1039         DECODE_HEAD;
1040
1041         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1042                 goto out;
1043
1044         /* For convenience's sake, we compare raw xdr'd attributes in
1045          * nfsd4_proc_verify; however we still decode here just to return
1046          * correct error in case of bad xdr. */
1047 #if 0
1048         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1049         if (status == nfserr_inval) {
1050                 status = nfserrno(status);
1051                 goto out;
1052         }
1053 #endif
1054         READ_BUF(4);
1055         READ32(verify->ve_attrlen);
1056         READ_BUF(verify->ve_attrlen);
1057         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1058
1059         DECODE_TAIL;
1060 }
1061
1062 static __be32
1063 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1064 {
1065         int avail;
1066         int v;
1067         int len;
1068         DECODE_HEAD;
1069
1070         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1071         if (status)
1072                 return status;
1073         READ_BUF(16);
1074         READ64(write->wr_offset);
1075         READ32(write->wr_stable_how);
1076         if (write->wr_stable_how > 2)
1077                 goto xdr_error;
1078         READ32(write->wr_buflen);
1079
1080         /* Sorry .. no magic macros for this.. *
1081          * READ_BUF(write->wr_buflen);
1082          * SAVEMEM(write->wr_buf, write->wr_buflen);
1083          */
1084         avail = (char*)argp->end - (char*)argp->p;
1085         if (avail + argp->pagelen < write->wr_buflen) {
1086                 dprintk("NFSD: xdr error (%s:%d)\n",
1087                                 __FILE__, __LINE__);
1088                 goto xdr_error;
1089         }
1090         argp->rqstp->rq_vec[0].iov_base = p;
1091         argp->rqstp->rq_vec[0].iov_len = avail;
1092         v = 0;
1093         len = write->wr_buflen;
1094         while (len > argp->rqstp->rq_vec[v].iov_len) {
1095                 len -= argp->rqstp->rq_vec[v].iov_len;
1096                 v++;
1097                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
1098                 argp->pagelist++;
1099                 if (argp->pagelen >= PAGE_SIZE) {
1100                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1101                         argp->pagelen -= PAGE_SIZE;
1102                 } else {
1103                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1104                         argp->pagelen -= len;
1105                 }
1106         }
1107         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1108         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1109         argp->rqstp->rq_vec[v].iov_len = len;
1110         write->wr_vlen = v+1;
1111
1112         DECODE_TAIL;
1113 }
1114
1115 static __be32
1116 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1117 {
1118         DECODE_HEAD;
1119
1120         READ_BUF(12);
1121         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1122         READ32(rlockowner->rl_owner.len);
1123         READ_BUF(rlockowner->rl_owner.len);
1124         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1125
1126         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1127                 return nfserr_inval;
1128         DECODE_TAIL;
1129 }
1130
1131 static __be32
1132 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1133                          struct nfsd4_exchange_id *exid)
1134 {
1135         int dummy, tmp;
1136         DECODE_HEAD;
1137
1138         READ_BUF(NFS4_VERIFIER_SIZE);
1139         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1140
1141         status = nfsd4_decode_opaque(argp, &exid->clname);
1142         if (status)
1143                 return nfserr_bad_xdr;
1144
1145         READ_BUF(4);
1146         READ32(exid->flags);
1147
1148         /* Ignore state_protect4_a */
1149         READ_BUF(4);
1150         READ32(exid->spa_how);
1151         switch (exid->spa_how) {
1152         case SP4_NONE:
1153                 break;
1154         case SP4_MACH_CRED:
1155                 /* spo_must_enforce */
1156                 READ_BUF(4);
1157                 READ32(dummy);
1158                 READ_BUF(dummy * 4);
1159                 p += dummy;
1160
1161                 /* spo_must_allow */
1162                 READ_BUF(4);
1163                 READ32(dummy);
1164                 READ_BUF(dummy * 4);
1165                 p += dummy;
1166                 break;
1167         case SP4_SSV:
1168                 /* ssp_ops */
1169                 READ_BUF(4);
1170                 READ32(dummy);
1171                 READ_BUF(dummy * 4);
1172                 p += dummy;
1173
1174                 READ_BUF(4);
1175                 READ32(dummy);
1176                 READ_BUF(dummy * 4);
1177                 p += dummy;
1178
1179                 /* ssp_hash_algs<> */
1180                 READ_BUF(4);
1181                 READ32(tmp);
1182                 while (tmp--) {
1183                         READ_BUF(4);
1184                         READ32(dummy);
1185                         READ_BUF(dummy);
1186                         p += XDR_QUADLEN(dummy);
1187                 }
1188
1189                 /* ssp_encr_algs<> */
1190                 READ_BUF(4);
1191                 READ32(tmp);
1192                 while (tmp--) {
1193                         READ_BUF(4);
1194                         READ32(dummy);
1195                         READ_BUF(dummy);
1196                         p += XDR_QUADLEN(dummy);
1197                 }
1198
1199                 /* ssp_window and ssp_num_gss_handles */
1200                 READ_BUF(8);
1201                 READ32(dummy);
1202                 READ32(dummy);
1203                 break;
1204         default:
1205                 goto xdr_error;
1206         }
1207
1208         /* Ignore Implementation ID */
1209         READ_BUF(4);    /* nfs_impl_id4 array length */
1210         READ32(dummy);
1211
1212         if (dummy > 1)
1213                 goto xdr_error;
1214
1215         if (dummy == 1) {
1216                 /* nii_domain */
1217                 READ_BUF(4);
1218                 READ32(dummy);
1219                 READ_BUF(dummy);
1220                 p += XDR_QUADLEN(dummy);
1221
1222                 /* nii_name */
1223                 READ_BUF(4);
1224                 READ32(dummy);
1225                 READ_BUF(dummy);
1226                 p += XDR_QUADLEN(dummy);
1227
1228                 /* nii_date */
1229                 READ_BUF(12);
1230                 p += 3;
1231         }
1232         DECODE_TAIL;
1233 }
1234
1235 static __be32
1236 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1237                             struct nfsd4_create_session *sess)
1238 {
1239         DECODE_HEAD;
1240
1241         u32 dummy;
1242         char *machine_name;
1243         int i;
1244         int nr_secflavs;
1245
1246         READ_BUF(16);
1247         COPYMEM(&sess->clientid, 8);
1248         READ32(sess->seqid);
1249         READ32(sess->flags);
1250
1251         /* Fore channel attrs */
1252         READ_BUF(28);
1253         READ32(dummy); /* headerpadsz is always 0 */
1254         READ32(sess->fore_channel.maxreq_sz);
1255         READ32(sess->fore_channel.maxresp_sz);
1256         READ32(sess->fore_channel.maxresp_cached);
1257         READ32(sess->fore_channel.maxops);
1258         READ32(sess->fore_channel.maxreqs);
1259         READ32(sess->fore_channel.nr_rdma_attrs);
1260         if (sess->fore_channel.nr_rdma_attrs == 1) {
1261                 READ_BUF(4);
1262                 READ32(sess->fore_channel.rdma_attrs);
1263         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1264                 dprintk("Too many fore channel attr bitmaps!\n");
1265                 goto xdr_error;
1266         }
1267
1268         /* Back channel attrs */
1269         READ_BUF(28);
1270         READ32(dummy); /* headerpadsz is always 0 */
1271         READ32(sess->back_channel.maxreq_sz);
1272         READ32(sess->back_channel.maxresp_sz);
1273         READ32(sess->back_channel.maxresp_cached);
1274         READ32(sess->back_channel.maxops);
1275         READ32(sess->back_channel.maxreqs);
1276         READ32(sess->back_channel.nr_rdma_attrs);
1277         if (sess->back_channel.nr_rdma_attrs == 1) {
1278                 READ_BUF(4);
1279                 READ32(sess->back_channel.rdma_attrs);
1280         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1281                 dprintk("Too many back channel attr bitmaps!\n");
1282                 goto xdr_error;
1283         }
1284
1285         READ_BUF(8);
1286         READ32(sess->callback_prog);
1287
1288         /* callback_sec_params4 */
1289         READ32(nr_secflavs);
1290         for (i = 0; i < nr_secflavs; ++i) {
1291                 READ_BUF(4);
1292                 READ32(dummy);
1293                 switch (dummy) {
1294                 case RPC_AUTH_NULL:
1295                         /* Nothing to read */
1296                         break;
1297                 case RPC_AUTH_UNIX:
1298                         READ_BUF(8);
1299                         /* stamp */
1300                         READ32(dummy);
1301
1302                         /* machine name */
1303                         READ32(dummy);
1304                         READ_BUF(dummy);
1305                         SAVEMEM(machine_name, dummy);
1306
1307                         /* uid, gid */
1308                         READ_BUF(8);
1309                         READ32(sess->uid);
1310                         READ32(sess->gid);
1311
1312                         /* more gids */
1313                         READ_BUF(4);
1314                         READ32(dummy);
1315                         READ_BUF(dummy * 4);
1316                         break;
1317                 case RPC_AUTH_GSS:
1318                         dprintk("RPC_AUTH_GSS callback secflavor "
1319                                 "not supported!\n");
1320                         READ_BUF(8);
1321                         /* gcbp_service */
1322                         READ32(dummy);
1323                         /* gcbp_handle_from_server */
1324                         READ32(dummy);
1325                         READ_BUF(dummy);
1326                         p += XDR_QUADLEN(dummy);
1327                         /* gcbp_handle_from_client */
1328                         READ_BUF(4);
1329                         READ32(dummy);
1330                         READ_BUF(dummy);
1331                         break;
1332                 default:
1333                         dprintk("Illegal callback secflavor\n");
1334                         return nfserr_inval;
1335                 }
1336         }
1337         DECODE_TAIL;
1338 }
1339
1340 static __be32
1341 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1342                              struct nfsd4_destroy_session *destroy_session)
1343 {
1344         DECODE_HEAD;
1345         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1346         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1347
1348         DECODE_TAIL;
1349 }
1350
1351 static __be32
1352 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1353                           struct nfsd4_free_stateid *free_stateid)
1354 {
1355         DECODE_HEAD;
1356
1357         READ_BUF(sizeof(stateid_t));
1358         READ32(free_stateid->fr_stateid.si_generation);
1359         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1360
1361         DECODE_TAIL;
1362 }
1363
1364 static __be32
1365 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1366                       struct nfsd4_sequence *seq)
1367 {
1368         DECODE_HEAD;
1369
1370         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1371         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1372         READ32(seq->seqid);
1373         READ32(seq->slotid);
1374         READ32(seq->maxslots);
1375         READ32(seq->cachethis);
1376
1377         DECODE_TAIL;
1378 }
1379
1380 static __be32
1381 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1382 {
1383         int i;
1384         __be32 *p, status;
1385         struct nfsd4_test_stateid_id *stateid;
1386
1387         READ_BUF(4);
1388         test_stateid->ts_num_ids = ntohl(*p++);
1389
1390         INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1391
1392         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1393                 stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1394                 if (!stateid) {
1395                         status = nfserrno(-ENOMEM);
1396                         goto out;
1397                 }
1398
1399                 defer_free(argp, kfree, stateid);
1400                 INIT_LIST_HEAD(&stateid->ts_id_list);
1401                 list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1402
1403                 status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1404                 if (status)
1405                         goto out;
1406         }
1407
1408         status = 0;
1409 out:
1410         return status;
1411 xdr_error:
1412         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1413         status = nfserr_bad_xdr;
1414         goto out;
1415 }
1416
1417 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1418 {
1419         DECODE_HEAD;
1420
1421         READ_BUF(8);
1422         COPYMEM(&dc->clientid, 8);
1423
1424         DECODE_TAIL;
1425 }
1426
1427 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1428 {
1429         DECODE_HEAD;
1430
1431         READ_BUF(4);
1432         READ32(rc->rca_one_fs);
1433
1434         DECODE_TAIL;
1435 }
1436
1437 static __be32
1438 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1439 {
1440         return nfs_ok;
1441 }
1442
1443 static __be32
1444 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1445 {
1446         return nfserr_notsupp;
1447 }
1448
1449 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1450
1451 static nfsd4_dec nfsd4_dec_ops[] = {
1452         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1453         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1454         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1455         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1456         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1457         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1458         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1459         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1460         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1461         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1462         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1463         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1464         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1465         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1466         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1467         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1468         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1469         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1470         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1471         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1472         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1473         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1474         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1475         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1476         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1477         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1478         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1479         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1480         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1481         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1482         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1483         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1484         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1485         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1486         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1487         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1488         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1489 };
1490
1491 static nfsd4_dec nfsd41_dec_ops[] = {
1492         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1493         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1494         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1495         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1496         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1497         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1498         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1499         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1500         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1501         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1502         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1503         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1504         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1505         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1506         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1507         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1508         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1509         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1510         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1511         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1512         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1513         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1514         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1515         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1516         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1517         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1518         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1519         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1520         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1521         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1522         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1523         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1524         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1525         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1526         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1527         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1528         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1529
1530         /* new operations for NFSv4.1 */
1531         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1532         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1533         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1534         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1535         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1536         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1537         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1538         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1539         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1540         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1541         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1542         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1543         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1544         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1545         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1546         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1547         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1548         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1549         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1550 };
1551
1552 struct nfsd4_minorversion_ops {
1553         nfsd4_dec *decoders;
1554         int nops;
1555 };
1556
1557 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1558         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1559         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1560 };
1561
1562 static __be32
1563 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1564 {
1565         DECODE_HEAD;
1566         struct nfsd4_op *op;
1567         struct nfsd4_minorversion_ops *ops;
1568         bool cachethis = false;
1569         int i;
1570
1571         /*
1572          * XXX: According to spec, we should check the tag
1573          * for UTF-8 compliance.  I'm postponing this for
1574          * now because it seems that some clients do use
1575          * binary tags.
1576          */
1577         READ_BUF(4);
1578         READ32(argp->taglen);
1579         READ_BUF(argp->taglen + 8);
1580         SAVEMEM(argp->tag, argp->taglen);
1581         READ32(argp->minorversion);
1582         READ32(argp->opcnt);
1583
1584         if (argp->taglen > NFSD4_MAX_TAGLEN)
1585                 goto xdr_error;
1586         if (argp->opcnt > 100)
1587                 goto xdr_error;
1588
1589         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1590                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1591                 if (!argp->ops) {
1592                         argp->ops = argp->iops;
1593                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1594                         goto xdr_error;
1595                 }
1596         }
1597
1598         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1599                 argp->opcnt = 0;
1600
1601         ops = &nfsd4_minorversion[argp->minorversion];
1602         for (i = 0; i < argp->opcnt; i++) {
1603                 op = &argp->ops[i];
1604                 op->replay = NULL;
1605
1606                 /*
1607                  * We can't use READ_BUF() here because we need to handle
1608                  * a missing opcode as an OP_WRITE + 1. So we need to check
1609                  * to see if we're truly at the end of our buffer or if there
1610                  * is another page we need to flip to.
1611                  */
1612
1613                 if (argp->p == argp->end) {
1614                         if (argp->pagelen < 4) {
1615                                 /* There isn't an opcode still on the wire */
1616                                 op->opnum = OP_WRITE + 1;
1617                                 op->status = nfserr_bad_xdr;
1618                                 argp->opcnt = i+1;
1619                                 break;
1620                         }
1621
1622                         /*
1623                          * False alarm. We just hit a page boundary, but there
1624                          * is still data available.  Move pointer across page
1625                          * boundary.  *snip from READ_BUF*
1626                          */
1627                         argp->p = page_address(argp->pagelist[0]);
1628                         argp->pagelist++;
1629                         if (argp->pagelen < PAGE_SIZE) {
1630                                 argp->end = argp->p + (argp->pagelen>>2);
1631                                 argp->pagelen = 0;
1632                         } else {
1633                                 argp->end = argp->p + (PAGE_SIZE>>2);
1634                                 argp->pagelen -= PAGE_SIZE;
1635                         }
1636                 }
1637                 op->opnum = ntohl(*argp->p++);
1638
1639                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1640                         op->status = ops->decoders[op->opnum](argp, &op->u);
1641                 else {
1642                         op->opnum = OP_ILLEGAL;
1643                         op->status = nfserr_op_illegal;
1644                 }
1645
1646                 if (op->status) {
1647                         argp->opcnt = i+1;
1648                         break;
1649                 }
1650                 /*
1651                  * We'll try to cache the result in the DRC if any one
1652                  * op in the compound wants to be cached:
1653                  */
1654                 cachethis |= nfsd4_cache_this_op(op);
1655         }
1656         /* Sessions make the DRC unnecessary: */
1657         if (argp->minorversion)
1658                 cachethis = false;
1659         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1660
1661         DECODE_TAIL;
1662 }
1663
1664 #define WRITE32(n)               *p++ = htonl(n)
1665 #define WRITE64(n)               do {                           \
1666         *p++ = htonl((u32)((n) >> 32));                         \
1667         *p++ = htonl((u32)(n));                                 \
1668 } while (0)
1669 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1670         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1671         memcpy(p, ptr, nbytes);                                 \
1672         p += XDR_QUADLEN(nbytes);                               \
1673 }} while (0)
1674
1675 static void write32(__be32 **p, u32 n)
1676 {
1677         *(*p)++ = n;
1678 }
1679
1680 static void write64(__be32 **p, u64 n)
1681 {
1682         write32(p, (u32)(n >> 32));
1683         write32(p, (u32)n);
1684 }
1685
1686 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1687 {
1688         if (IS_I_VERSION(inode)) {
1689                 write64(p, inode->i_version);
1690         } else {
1691                 write32(p, stat->ctime.tv_sec);
1692                 write32(p, stat->ctime.tv_nsec);
1693         }
1694 }
1695
1696 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1697 {
1698         write32(p, c->atomic);
1699         if (c->change_supported) {
1700                 write64(p, c->before_change);
1701                 write64(p, c->after_change);
1702         } else {
1703                 write32(p, c->before_ctime_sec);
1704                 write32(p, c->before_ctime_nsec);
1705                 write32(p, c->after_ctime_sec);
1706                 write32(p, c->after_ctime_nsec);
1707         }
1708 }
1709
1710 #define RESERVE_SPACE(nbytes)   do {                            \
1711         p = resp->p;                                            \
1712         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1713 } while (0)
1714 #define ADJUST_ARGS()           resp->p = p
1715
1716 /*
1717  * Header routine to setup seqid operation replay cache
1718  */
1719 #define ENCODE_SEQID_OP_HEAD                                    \
1720         __be32 *save;                                           \
1721                                                                 \
1722         save = resp->p;
1723
1724 /*
1725  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1726  * is where sequence id's are incremented, and the replay cache is filled.
1727  * Note that we increment sequence id's here, at the last moment, so we're sure
1728  * we know whether the error to be returned is a sequence id mutating error.
1729  */
1730
1731 static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1732 {
1733         struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1734
1735         if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1736                 stateowner->so_seqid++;
1737                 stateowner->so_replay.rp_status = nfserr;
1738                 stateowner->so_replay.rp_buflen =
1739                           (char *)resp->p - (char *)save;
1740                 memcpy(stateowner->so_replay.rp_buf, save,
1741                         stateowner->so_replay.rp_buflen);
1742                 nfsd4_purge_closed_stateid(stateowner);
1743         }
1744 }
1745
1746 /* Encode as an array of strings the string given with components
1747  * separated @sep.
1748  */
1749 static __be32 nfsd4_encode_components(char sep, char *components,
1750                                    __be32 **pp, int *buflen)
1751 {
1752         __be32 *p = *pp;
1753         __be32 *countp = p;
1754         int strlen, count=0;
1755         char *str, *end;
1756
1757         dprintk("nfsd4_encode_components(%s)\n", components);
1758         if ((*buflen -= 4) < 0)
1759                 return nfserr_resource;
1760         WRITE32(0); /* We will fill this in with @count later */
1761         end = str = components;
1762         while (*end) {
1763                 for (; *end && (*end != sep); end++)
1764                         ; /* Point to end of component */
1765                 strlen = end - str;
1766                 if (strlen) {
1767                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1768                                 return nfserr_resource;
1769                         WRITE32(strlen);
1770                         WRITEMEM(str, strlen);
1771                         count++;
1772                 }
1773                 else
1774                         end++;
1775                 str = end;
1776         }
1777         *pp = p;
1778         p = countp;
1779         WRITE32(count);
1780         return 0;
1781 }
1782
1783 /*
1784  * encode a location element of a fs_locations structure
1785  */
1786 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1787                                     __be32 **pp, int *buflen)
1788 {
1789         __be32 status;
1790         __be32 *p = *pp;
1791
1792         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1793         if (status)
1794                 return status;
1795         status = nfsd4_encode_components('/', location->path, &p, buflen);
1796         if (status)
1797                 return status;
1798         *pp = p;
1799         return 0;
1800 }
1801
1802 /*
1803  * Encode a path in RFC3530 'pathname4' format
1804  */
1805 static __be32 nfsd4_encode_path(const struct path *root,
1806                 const struct path *path, __be32 **pp, int *buflen)
1807 {
1808         struct path cur = {
1809                 .mnt = path->mnt,
1810                 .dentry = path->dentry,
1811         };
1812         __be32 *p = *pp;
1813         struct dentry **components = NULL;
1814         unsigned int ncomponents = 0;
1815         __be32 err = nfserr_jukebox;
1816
1817         dprintk("nfsd4_encode_components(");
1818
1819         path_get(&cur);
1820         /* First walk the path up to the nfsd root, and store the
1821          * dentries/path components in an array.
1822          */
1823         for (;;) {
1824                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1825                         break;
1826                 if (cur.dentry == cur.mnt->mnt_root) {
1827                         if (follow_up(&cur))
1828                                 continue;
1829                         goto out_free;
1830                 }
1831                 if ((ncomponents & 15) == 0) {
1832                         struct dentry **new;
1833                         new = krealloc(components,
1834                                         sizeof(*new) * (ncomponents + 16),
1835                                         GFP_KERNEL);
1836                         if (!new)
1837                                 goto out_free;
1838                         components = new;
1839                 }
1840                 components[ncomponents++] = cur.dentry;
1841                 cur.dentry = dget_parent(cur.dentry);
1842         }
1843
1844         *buflen -= 4;
1845         if (*buflen < 0)
1846                 goto out_free;
1847         WRITE32(ncomponents);
1848
1849         while (ncomponents) {
1850                 struct dentry *dentry = components[ncomponents - 1];
1851                 unsigned int len = dentry->d_name.len;
1852
1853                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1854                 if (*buflen < 0)
1855                         goto out_free;
1856                 WRITE32(len);
1857                 WRITEMEM(dentry->d_name.name, len);
1858                 dprintk("/%s", dentry->d_name.name);
1859                 dput(dentry);
1860                 ncomponents--;
1861         }
1862
1863         *pp = p;
1864         err = 0;
1865 out_free:
1866         dprintk(")\n");
1867         while (ncomponents)
1868                 dput(components[--ncomponents]);
1869         kfree(components);
1870         path_put(&cur);
1871         return err;
1872 }
1873
1874 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1875                 const struct path *path, __be32 **pp, int *buflen)
1876 {
1877         struct svc_export *exp_ps;
1878         __be32 res;
1879
1880         exp_ps = rqst_find_fsidzero_export(rqstp);
1881         if (IS_ERR(exp_ps))
1882                 return nfserrno(PTR_ERR(exp_ps));
1883         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1884         exp_put(exp_ps);
1885         return res;
1886 }
1887
1888 /*
1889  *  encode a fs_locations structure
1890  */
1891 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1892                                      struct svc_export *exp,
1893                                      __be32 **pp, int *buflen)
1894 {
1895         __be32 status;
1896         int i;
1897         __be32 *p = *pp;
1898         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1899
1900         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1901         if (status)
1902                 return status;
1903         if ((*buflen -= 4) < 0)
1904                 return nfserr_resource;
1905         WRITE32(fslocs->locations_count);
1906         for (i=0; i<fslocs->locations_count; i++) {
1907                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1908                                                    &p, buflen);
1909                 if (status)
1910                         return status;
1911         }
1912         *pp = p;
1913         return 0;
1914 }
1915
1916 static u32 nfs4_file_type(umode_t mode)
1917 {
1918         switch (mode & S_IFMT) {
1919         case S_IFIFO:   return NF4FIFO;
1920         case S_IFCHR:   return NF4CHR;
1921         case S_IFDIR:   return NF4DIR;
1922         case S_IFBLK:   return NF4BLK;
1923         case S_IFLNK:   return NF4LNK;
1924         case S_IFREG:   return NF4REG;
1925         case S_IFSOCK:  return NF4SOCK;
1926         default:        return NF4BAD;
1927         };
1928 }
1929
1930 static __be32
1931 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1932                         __be32 **p, int *buflen)
1933 {
1934         int status;
1935
1936         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1937                 return nfserr_resource;
1938         if (whotype != NFS4_ACL_WHO_NAMED)
1939                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1940         else if (group)
1941                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1942         else
1943                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1944         if (status < 0)
1945                 return nfserrno(status);
1946         *p = xdr_encode_opaque(*p, NULL, status);
1947         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1948         BUG_ON(*buflen < 0);
1949         return 0;
1950 }
1951
1952 static inline __be32
1953 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1954 {
1955         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1956 }
1957
1958 static inline __be32
1959 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1960 {
1961         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1962 }
1963
1964 static inline __be32
1965 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1966                 __be32 **p, int *buflen)
1967 {
1968         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1969 }
1970
1971 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1972                               FATTR4_WORD0_RDATTR_ERROR)
1973 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1974
1975 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1976 {
1977         /* As per referral draft:  */
1978         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1979             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1980                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1981                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1982                         *rdattr_err = NFSERR_MOVED;
1983                 else
1984                         return nfserr_moved;
1985         }
1986         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1987         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1988         return 0;
1989 }
1990
1991 /*
1992  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1993  * ourselves.
1994  *
1995  * @countp is the buffer size in _words_; upon successful return this becomes
1996  * replaced with the number of words written.
1997  */
1998 __be32
1999 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2000                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
2001                 struct svc_rqst *rqstp, int ignore_crossmnt)
2002 {
2003         u32 bmval0 = bmval[0];
2004         u32 bmval1 = bmval[1];
2005         u32 bmval2 = bmval[2];
2006         struct kstat stat;
2007         struct svc_fh tempfh;
2008         struct kstatfs statfs;
2009         int buflen = *countp << 2;
2010         __be32 *attrlenp;
2011         u32 dummy;
2012         u64 dummy64;
2013         u32 rdattr_err = 0;
2014         __be32 *p = buffer;
2015         __be32 status;
2016         int err;
2017         int aclsupport = 0;
2018         struct nfs4_acl *acl = NULL;
2019         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2020         u32 minorversion = resp->cstate.minorversion;
2021         struct path path = {
2022                 .mnt    = exp->ex_path.mnt,
2023                 .dentry = dentry,
2024         };
2025
2026         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2027         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2028         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2029         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2030
2031         if (exp->ex_fslocs.migrated) {
2032                 BUG_ON(bmval[2]);
2033                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2034                 if (status)
2035                         goto out;
2036         }
2037
2038         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2039         if (err)
2040                 goto out_nfserr;
2041         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2042                         FATTR4_WORD0_MAXNAME)) ||
2043             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2044                        FATTR4_WORD1_SPACE_TOTAL))) {
2045                 err = vfs_statfs(&path, &statfs);
2046                 if (err)
2047                         goto out_nfserr;
2048         }
2049         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2050                 fh_init(&tempfh, NFS4_FHSIZE);
2051                 status = fh_compose(&tempfh, exp, dentry, NULL);
2052                 if (status)
2053                         goto out;
2054                 fhp = &tempfh;
2055         }
2056         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2057                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2058                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2059                 aclsupport = (err == 0);
2060                 if (bmval0 & FATTR4_WORD0_ACL) {
2061                         if (err == -EOPNOTSUPP)
2062                                 bmval0 &= ~FATTR4_WORD0_ACL;
2063                         else if (err == -EINVAL) {
2064                                 status = nfserr_attrnotsupp;
2065                                 goto out;
2066                         } else if (err != 0)
2067                                 goto out_nfserr;
2068                 }
2069         }
2070
2071         if (bmval2) {
2072                 if ((buflen -= 16) < 0)
2073                         goto out_resource;
2074                 WRITE32(3);
2075                 WRITE32(bmval0);
2076                 WRITE32(bmval1);
2077                 WRITE32(bmval2);
2078         } else if (bmval1) {
2079                 if ((buflen -= 12) < 0)
2080                         goto out_resource;
2081                 WRITE32(2);
2082                 WRITE32(bmval0);
2083                 WRITE32(bmval1);
2084         } else {
2085                 if ((buflen -= 8) < 0)
2086                         goto out_resource;
2087                 WRITE32(1);
2088                 WRITE32(bmval0);
2089         }
2090         attrlenp = p++;                /* to be backfilled later */
2091
2092         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2093                 u32 word0 = nfsd_suppattrs0(minorversion);
2094                 u32 word1 = nfsd_suppattrs1(minorversion);
2095                 u32 word2 = nfsd_suppattrs2(minorversion);
2096
2097                 if (!aclsupport)
2098                         word0 &= ~FATTR4_WORD0_ACL;
2099                 if (!word2) {
2100                         if ((buflen -= 12) < 0)
2101                                 goto out_resource;
2102                         WRITE32(2);
2103                         WRITE32(word0);
2104                         WRITE32(word1);
2105                 } else {
2106                         if ((buflen -= 16) < 0)
2107                                 goto out_resource;
2108                         WRITE32(3);
2109                         WRITE32(word0);
2110                         WRITE32(word1);
2111                         WRITE32(word2);
2112                 }
2113         }
2114         if (bmval0 & FATTR4_WORD0_TYPE) {
2115                 if ((buflen -= 4) < 0)
2116                         goto out_resource;
2117                 dummy = nfs4_file_type(stat.mode);
2118                 if (dummy == NF4BAD)
2119                         goto out_serverfault;
2120                 WRITE32(dummy);
2121         }
2122         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2123                 if ((buflen -= 4) < 0)
2124                         goto out_resource;
2125                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2126                         WRITE32(NFS4_FH_PERSISTENT);
2127                 else
2128                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2129         }
2130         if (bmval0 & FATTR4_WORD0_CHANGE) {
2131                 if ((buflen -= 8) < 0)
2132                         goto out_resource;
2133                 write_change(&p, &stat, dentry->d_inode);
2134         }
2135         if (bmval0 & FATTR4_WORD0_SIZE) {
2136                 if ((buflen -= 8) < 0)
2137                         goto out_resource;
2138                 WRITE64(stat.size);
2139         }
2140         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2141                 if ((buflen -= 4) < 0)
2142                         goto out_resource;
2143                 WRITE32(1);
2144         }
2145         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2146                 if ((buflen -= 4) < 0)
2147                         goto out_resource;
2148                 WRITE32(1);
2149         }
2150         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2151                 if ((buflen -= 4) < 0)
2152                         goto out_resource;
2153                 WRITE32(0);
2154         }
2155         if (bmval0 & FATTR4_WORD0_FSID) {
2156                 if ((buflen -= 16) < 0)
2157                         goto out_resource;
2158                 if (exp->ex_fslocs.migrated) {
2159                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2160                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2161                 } else switch(fsid_source(fhp)) {
2162                 case FSIDSOURCE_FSID:
2163                         WRITE64((u64)exp->ex_fsid);
2164                         WRITE64((u64)0);
2165                         break;
2166                 case FSIDSOURCE_DEV:
2167                         WRITE32(0);
2168                         WRITE32(MAJOR(stat.dev));
2169                         WRITE32(0);
2170                         WRITE32(MINOR(stat.dev));
2171                         break;
2172                 case FSIDSOURCE_UUID:
2173                         WRITEMEM(exp->ex_uuid, 16);
2174                         break;
2175                 }
2176         }
2177         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2178                 if ((buflen -= 4) < 0)
2179                         goto out_resource;
2180                 WRITE32(0);
2181         }
2182         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2183                 if ((buflen -= 4) < 0)
2184                         goto out_resource;
2185                 WRITE32(nfsd4_lease);
2186         }
2187         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2188                 if ((buflen -= 4) < 0)
2189                         goto out_resource;
2190                 WRITE32(rdattr_err);
2191         }
2192         if (bmval0 & FATTR4_WORD0_ACL) {
2193                 struct nfs4_ace *ace;
2194
2195                 if (acl == NULL) {
2196                         if ((buflen -= 4) < 0)
2197                                 goto out_resource;
2198
2199                         WRITE32(0);
2200                         goto out_acl;
2201                 }
2202                 if ((buflen -= 4) < 0)
2203                         goto out_resource;
2204                 WRITE32(acl->naces);
2205
2206                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2207                         if ((buflen -= 4*3) < 0)
2208                                 goto out_resource;
2209                         WRITE32(ace->type);
2210                         WRITE32(ace->flag);
2211                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2212                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
2213                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2214                                 &p, &buflen);
2215                         if (status == nfserr_resource)
2216                                 goto out_resource;
2217                         if (status)
2218                                 goto out;
2219                 }
2220         }
2221 out_acl:
2222         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2223                 if ((buflen -= 4) < 0)
2224                         goto out_resource;
2225                 WRITE32(aclsupport ?
2226                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2227         }
2228         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2229                 if ((buflen -= 4) < 0)
2230                         goto out_resource;
2231                 WRITE32(1);
2232         }
2233         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2234                 if ((buflen -= 4) < 0)
2235                         goto out_resource;
2236                 WRITE32(1);
2237         }
2238         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2239                 if ((buflen -= 4) < 0)
2240                         goto out_resource;
2241                 WRITE32(1);
2242         }
2243         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2244                 if ((buflen -= 4) < 0)
2245                         goto out_resource;
2246                 WRITE32(1);
2247         }
2248         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2249                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2250                 if (buflen < 0)
2251                         goto out_resource;
2252                 WRITE32(fhp->fh_handle.fh_size);
2253                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2254         }
2255         if (bmval0 & FATTR4_WORD0_FILEID) {
2256                 if ((buflen -= 8) < 0)
2257                         goto out_resource;
2258                 WRITE64(stat.ino);
2259         }
2260         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2261                 if ((buflen -= 8) < 0)
2262                         goto out_resource;
2263                 WRITE64((u64) statfs.f_ffree);
2264         }
2265         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2266                 if ((buflen -= 8) < 0)
2267                         goto out_resource;
2268                 WRITE64((u64) statfs.f_ffree);
2269         }
2270         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2271                 if ((buflen -= 8) < 0)
2272                         goto out_resource;
2273                 WRITE64((u64) statfs.f_files);
2274         }
2275         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2276                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2277                 if (status == nfserr_resource)
2278                         goto out_resource;
2279                 if (status)
2280                         goto out;
2281         }
2282         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2283                 if ((buflen -= 4) < 0)
2284                         goto out_resource;
2285                 WRITE32(1);
2286         }
2287         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2288                 if ((buflen -= 8) < 0)
2289                         goto out_resource;
2290                 WRITE64(~(u64)0);
2291         }
2292         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2293                 if ((buflen -= 4) < 0)
2294                         goto out_resource;
2295                 WRITE32(255);
2296         }
2297         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2298                 if ((buflen -= 4) < 0)
2299                         goto out_resource;
2300                 WRITE32(statfs.f_namelen);
2301         }
2302         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2303                 if ((buflen -= 8) < 0)
2304                         goto out_resource;
2305                 WRITE64((u64) svc_max_payload(rqstp));
2306         }
2307         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2308                 if ((buflen -= 8) < 0)
2309                         goto out_resource;
2310                 WRITE64((u64) svc_max_payload(rqstp));
2311         }
2312         if (bmval1 & FATTR4_WORD1_MODE) {
2313                 if ((buflen -= 4) < 0)
2314                         goto out_resource;
2315                 WRITE32(stat.mode & S_IALLUGO);
2316         }
2317         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2318                 if ((buflen -= 4) < 0)
2319                         goto out_resource;
2320                 WRITE32(1);
2321         }
2322         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2323                 if ((buflen -= 4) < 0)
2324                         goto out_resource;
2325                 WRITE32(stat.nlink);
2326         }
2327         if (bmval1 & FATTR4_WORD1_OWNER) {
2328                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2329                 if (status == nfserr_resource)
2330                         goto out_resource;
2331                 if (status)
2332                         goto out;
2333         }
2334         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2335                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2336                 if (status == nfserr_resource)
2337                         goto out_resource;
2338                 if (status)
2339                         goto out;
2340         }
2341         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2342                 if ((buflen -= 8) < 0)
2343                         goto out_resource;
2344                 WRITE32((u32) MAJOR(stat.rdev));
2345                 WRITE32((u32) MINOR(stat.rdev));
2346         }
2347         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2348                 if ((buflen -= 8) < 0)
2349                         goto out_resource;
2350                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2351                 WRITE64(dummy64);
2352         }
2353         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2354                 if ((buflen -= 8) < 0)
2355                         goto out_resource;
2356                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2357                 WRITE64(dummy64);
2358         }
2359         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2360                 if ((buflen -= 8) < 0)
2361                         goto out_resource;
2362                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2363                 WRITE64(dummy64);
2364         }
2365         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2366                 if ((buflen -= 8) < 0)
2367                         goto out_resource;
2368                 dummy64 = (u64)stat.blocks << 9;
2369                 WRITE64(dummy64);
2370         }
2371         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2372                 if ((buflen -= 12) < 0)
2373                         goto out_resource;
2374                 WRITE32(0);
2375                 WRITE32(stat.atime.tv_sec);
2376                 WRITE32(stat.atime.tv_nsec);
2377         }
2378         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2379                 if ((buflen -= 12) < 0)
2380                         goto out_resource;
2381                 WRITE32(0);
2382                 WRITE32(1);
2383                 WRITE32(0);
2384         }
2385         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2386                 if ((buflen -= 12) < 0)
2387                         goto out_resource;
2388                 WRITE32(0);
2389                 WRITE32(stat.ctime.tv_sec);
2390                 WRITE32(stat.ctime.tv_nsec);
2391         }
2392         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2393                 if ((buflen -= 12) < 0)
2394                         goto out_resource;
2395                 WRITE32(0);
2396                 WRITE32(stat.mtime.tv_sec);
2397                 WRITE32(stat.mtime.tv_nsec);
2398         }
2399         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2400                 if ((buflen -= 8) < 0)
2401                         goto out_resource;
2402                 /*
2403                  * Get parent's attributes if not ignoring crossmount
2404                  * and this is the root of a cross-mounted filesystem.
2405                  */
2406                 if (ignore_crossmnt == 0 &&
2407                     dentry == exp->ex_path.mnt->mnt_root) {
2408                         struct path path = exp->ex_path;
2409                         path_get(&path);
2410                         while (follow_up(&path)) {
2411                                 if (path.dentry != path.mnt->mnt_root)
2412                                         break;
2413                         }
2414                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2415                         path_put(&path);
2416                         if (err)
2417                                 goto out_nfserr;
2418                 }
2419                 WRITE64(stat.ino);
2420         }
2421         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2422                 WRITE32(3);
2423                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2424                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2425                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2426         }
2427
2428         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2429         *countp = p - buffer;
2430         status = nfs_ok;
2431
2432 out:
2433         kfree(acl);
2434         if (fhp == &tempfh)
2435                 fh_put(&tempfh);
2436         return status;
2437 out_nfserr:
2438         status = nfserrno(err);
2439         goto out;
2440 out_resource:
2441         *countp = 0;
2442         status = nfserr_resource;
2443         goto out;
2444 out_serverfault:
2445         status = nfserr_serverfault;
2446         goto out;
2447 }
2448
2449 static inline int attributes_need_mount(u32 *bmval)
2450 {
2451         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2452                 return 1;
2453         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2454                 return 1;
2455         return 0;
2456 }
2457
2458 static __be32
2459 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2460                 const char *name, int namlen, __be32 *p, int *buflen)
2461 {
2462         struct svc_export *exp = cd->rd_fhp->fh_export;
2463         struct dentry *dentry;
2464         __be32 nfserr;
2465         int ignore_crossmnt = 0;
2466
2467         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2468         if (IS_ERR(dentry))
2469                 return nfserrno(PTR_ERR(dentry));
2470         if (!dentry->d_inode) {
2471                 /*
2472                  * nfsd_buffered_readdir drops the i_mutex between
2473                  * readdir and calling this callback, leaving a window
2474                  * where this directory entry could have gone away.
2475                  */
2476                 dput(dentry);
2477                 return nfserr_noent;
2478         }
2479
2480         exp_get(exp);
2481         /*
2482          * In the case of a mountpoint, the client may be asking for
2483          * attributes that are only properties of the underlying filesystem
2484          * as opposed to the cross-mounted file system. In such a case,
2485          * we will not follow the cross mount and will fill the attribtutes
2486          * directly from the mountpoint dentry.
2487          */
2488         if (nfsd_mountpoint(dentry, exp)) {
2489                 int err;
2490
2491                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2492                                 && !attributes_need_mount(cd->rd_bmval)) {
2493                         ignore_crossmnt = 1;
2494                         goto out_encode;
2495                 }
2496                 /*
2497                  * Why the heck aren't we just using nfsd_lookup??
2498                  * Different "."/".." handling?  Something else?
2499                  * At least, add a comment here to explain....
2500                  */
2501                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2502                 if (err) {
2503                         nfserr = nfserrno(err);
2504                         goto out_put;
2505                 }
2506                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2507                 if (nfserr)
2508                         goto out_put;
2509
2510         }
2511 out_encode:
2512         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2513                                         cd->rd_rqstp, ignore_crossmnt);
2514 out_put:
2515         dput(dentry);
2516         exp_put(exp);
2517         return nfserr;
2518 }
2519
2520 static __be32 *
2521 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2522 {
2523         __be32 *attrlenp;
2524
2525         if (buflen < 6)
2526                 return NULL;
2527         *p++ = htonl(2);
2528         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2529         *p++ = htonl(0);                         /* bmval1 */
2530
2531         attrlenp = p++;
2532         *p++ = nfserr;       /* no htonl */
2533         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2534         return p;
2535 }
2536
2537 static int
2538 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2539                     loff_t offset, u64 ino, unsigned int d_type)
2540 {
2541         struct readdir_cd *ccd = ccdv;
2542         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2543         int buflen;
2544         __be32 *p = cd->buffer;
2545         __be32 *cookiep;
2546         __be32 nfserr = nfserr_toosmall;
2547
2548         /* In nfsv4, "." and ".." never make it onto the wire.. */
2549         if (name && isdotent(name, namlen)) {
2550                 cd->common.err = nfs_ok;
2551                 return 0;
2552         }
2553
2554         if (cd->offset)
2555                 xdr_encode_hyper(cd->offset, (u64) offset);
2556
2557         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2558         if (buflen < 0)
2559                 goto fail;
2560
2561         *p++ = xdr_one;                             /* mark entry present */
2562         cookiep = p;
2563         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2564         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2565
2566         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2567         switch (nfserr) {
2568         case nfs_ok:
2569                 p += buflen;
2570                 break;
2571         case nfserr_resource:
2572                 nfserr = nfserr_toosmall;
2573                 goto fail;
2574         case nfserr_noent:
2575                 goto skip_entry;
2576         default:
2577                 /*
2578                  * If the client requested the RDATTR_ERROR attribute,
2579                  * we stuff the error code into this attribute
2580                  * and continue.  If this attribute was not requested,
2581                  * then in accordance with the spec, we fail the
2582                  * entire READDIR operation(!)
2583                  */
2584                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2585                         goto fail;
2586                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2587                 if (p == NULL) {
2588                         nfserr = nfserr_toosmall;
2589                         goto fail;
2590                 }
2591         }
2592         cd->buflen -= (p - cd->buffer);
2593         cd->buffer = p;
2594         cd->offset = cookiep;
2595 skip_entry:
2596         cd->common.err = nfs_ok;
2597         return 0;
2598 fail:
2599         cd->common.err = nfserr;
2600         return -EINVAL;
2601 }
2602
2603 static void
2604 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2605 {
2606         __be32 *p;
2607
2608         RESERVE_SPACE(sizeof(stateid_t));
2609         WRITE32(sid->si_generation);
2610         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2611         ADJUST_ARGS();
2612 }
2613
2614 static __be32
2615 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2616 {
2617         __be32 *p;
2618
2619         if (!nfserr) {
2620                 RESERVE_SPACE(8);
2621                 WRITE32(access->ac_supported);
2622                 WRITE32(access->ac_resp_access);
2623                 ADJUST_ARGS();
2624         }
2625         return nfserr;
2626 }
2627
2628 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2629 {
2630         __be32 *p;
2631
2632         if (!nfserr) {
2633                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2634                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2635                 WRITE32(bcts->dir);
2636                 /* XXX: ? */
2637                 WRITE32(0);
2638                 ADJUST_ARGS();
2639         }
2640         return nfserr;
2641 }
2642
2643 static __be32
2644 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2645 {
2646         ENCODE_SEQID_OP_HEAD;
2647
2648         if (!nfserr)
2649                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2650
2651         encode_seqid_op_tail(resp, save, nfserr);
2652         return nfserr;
2653 }
2654
2655
2656 static __be32
2657 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2658 {
2659         __be32 *p;
2660
2661         if (!nfserr) {
2662                 RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2663                 WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2664                 ADJUST_ARGS();
2665         }
2666         return nfserr;
2667 }
2668
2669 static __be32
2670 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2671 {
2672         __be32 *p;
2673
2674         if (!nfserr) {
2675                 RESERVE_SPACE(32);
2676                 write_cinfo(&p, &create->cr_cinfo);
2677                 WRITE32(2);
2678                 WRITE32(create->cr_bmval[0]);
2679                 WRITE32(create->cr_bmval[1]);
2680                 ADJUST_ARGS();
2681         }
2682         return nfserr;
2683 }
2684
2685 static __be32
2686 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2687 {
2688         struct svc_fh *fhp = getattr->ga_fhp;
2689         int buflen;
2690
2691         if (nfserr)
2692                 return nfserr;
2693
2694         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2695         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2696                                     resp->p, &buflen, getattr->ga_bmval,
2697                                     resp->rqstp, 0);
2698         if (!nfserr)
2699                 resp->p += buflen;
2700         return nfserr;
2701 }
2702
2703 static __be32
2704 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2705 {
2706         struct svc_fh *fhp = *fhpp;
2707         unsigned int len;
2708         __be32 *p;
2709
2710         if (!nfserr) {
2711                 len = fhp->fh_handle.fh_size;
2712                 RESERVE_SPACE(len + 4);
2713                 WRITE32(len);
2714                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2715                 ADJUST_ARGS();
2716         }
2717         return nfserr;
2718 }
2719
2720 /*
2721 * Including all fields other than the name, a LOCK4denied structure requires
2722 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2723 */
2724 static void
2725 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2726 {
2727         struct xdr_netobj *conf = &ld->ld_owner;
2728         __be32 *p;
2729
2730         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2731         WRITE64(ld->ld_start);
2732         WRITE64(ld->ld_length);
2733         WRITE32(ld->ld_type);
2734         if (conf->len) {
2735                 WRITEMEM(&ld->ld_clientid, 8);
2736                 WRITE32(conf->len);
2737                 WRITEMEM(conf->data, conf->len);
2738                 kfree(conf->data);
2739         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2740                 WRITE64((u64)0); /* clientid */
2741                 WRITE32(0); /* length of owner name */
2742         }
2743         ADJUST_ARGS();
2744 }
2745
2746 static __be32
2747 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2748 {
2749         ENCODE_SEQID_OP_HEAD;
2750
2751         if (!nfserr)
2752                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2753         else if (nfserr == nfserr_denied)
2754                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2755
2756         encode_seqid_op_tail(resp, save, nfserr);
2757         return nfserr;
2758 }
2759
2760 static __be32
2761 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2762 {
2763         if (nfserr == nfserr_denied)
2764                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2765         return nfserr;
2766 }
2767
2768 static __be32
2769 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2770 {
2771         ENCODE_SEQID_OP_HEAD;
2772
2773         if (!nfserr)
2774                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2775
2776         encode_seqid_op_tail(resp, save, nfserr);
2777         return nfserr;
2778 }
2779
2780
2781 static __be32
2782 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2783 {
2784         __be32 *p;
2785
2786         if (!nfserr) {
2787                 RESERVE_SPACE(20);
2788                 write_cinfo(&p, &link->li_cinfo);
2789                 ADJUST_ARGS();
2790         }
2791         return nfserr;
2792 }
2793
2794
2795 static __be32
2796 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2797 {
2798         __be32 *p;
2799         ENCODE_SEQID_OP_HEAD;
2800
2801         if (nfserr)
2802                 goto out;
2803
2804         nfsd4_encode_stateid(resp, &open->op_stateid);
2805         RESERVE_SPACE(40);
2806         write_cinfo(&p, &open->op_cinfo);
2807         WRITE32(open->op_rflags);
2808         WRITE32(2);
2809         WRITE32(open->op_bmval[0]);
2810         WRITE32(open->op_bmval[1]);
2811         WRITE32(open->op_delegate_type);
2812         ADJUST_ARGS();
2813
2814         switch (open->op_delegate_type) {
2815         case NFS4_OPEN_DELEGATE_NONE:
2816                 break;
2817         case NFS4_OPEN_DELEGATE_READ:
2818                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2819                 RESERVE_SPACE(20);
2820                 WRITE32(open->op_recall);
2821
2822                 /*
2823                  * TODO: ACE's in delegations
2824                  */
2825                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2826                 WRITE32(0);
2827                 WRITE32(0);
2828                 WRITE32(0);   /* XXX: is NULL principal ok? */
2829                 ADJUST_ARGS();
2830                 break;
2831         case NFS4_OPEN_DELEGATE_WRITE:
2832                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2833                 RESERVE_SPACE(32);
2834                 WRITE32(0);
2835
2836                 /*
2837                  * TODO: space_limit's in delegations
2838                  */
2839                 WRITE32(NFS4_LIMIT_SIZE);
2840                 WRITE32(~(u32)0);
2841                 WRITE32(~(u32)0);
2842
2843                 /*
2844                  * TODO: ACE's in delegations
2845                  */
2846                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2847                 WRITE32(0);
2848                 WRITE32(0);
2849                 WRITE32(0);   /* XXX: is NULL principal ok? */
2850                 ADJUST_ARGS();
2851                 break;
2852         case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2853                 switch (open->op_why_no_deleg) {
2854                 case WND4_CONTENTION:
2855                 case WND4_RESOURCE:
2856                         RESERVE_SPACE(8);
2857                         WRITE32(open->op_why_no_deleg);
2858                         WRITE32(0);     /* deleg signaling not supported yet */
2859                         break;
2860                 default:
2861                         RESERVE_SPACE(4);
2862                         WRITE32(open->op_why_no_deleg);
2863                 }
2864                 ADJUST_ARGS();
2865                 break;
2866         default:
2867                 BUG();
2868         }
2869         /* XXX save filehandle here */
2870 out:
2871         encode_seqid_op_tail(resp, save, nfserr);
2872         return nfserr;
2873 }
2874
2875 static __be32
2876 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2877 {
2878         ENCODE_SEQID_OP_HEAD;
2879
2880         if (!nfserr)
2881                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2882
2883         encode_seqid_op_tail(resp, save, nfserr);
2884         return nfserr;
2885 }
2886
2887 static __be32
2888 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2889 {
2890         ENCODE_SEQID_OP_HEAD;
2891
2892         if (!nfserr)
2893                 nfsd4_encode_stateid(resp, &od->od_stateid);
2894
2895         encode_seqid_op_tail(resp, save, nfserr);
2896         return nfserr;
2897 }
2898
2899 static __be32
2900 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2901                   struct nfsd4_read *read)
2902 {
2903         u32 eof;
2904         int v, pn;
2905         unsigned long maxcount;
2906         long len;
2907         __be32 *p;
2908
2909         if (nfserr)
2910                 return nfserr;
2911         if (resp->xbuf->page_len)
2912                 return nfserr_resource;
2913
2914         RESERVE_SPACE(8); /* eof flag and byte count */
2915
2916         maxcount = svc_max_payload(resp->rqstp);
2917         if (maxcount > read->rd_length)
2918                 maxcount = read->rd_length;
2919
2920         len = maxcount;
2921         v = 0;
2922         while (len > 0) {
2923                 pn = resp->rqstp->rq_resused++;
2924                 resp->rqstp->rq_vec[v].iov_base =
2925                         page_address(resp->rqstp->rq_respages[pn]);
2926                 resp->rqstp->rq_vec[v].iov_len =
2927                         len < PAGE_SIZE ? len : PAGE_SIZE;
2928                 v++;
2929                 len -= PAGE_SIZE;
2930         }
2931         read->rd_vlen = v;
2932
2933         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2934                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2935                         &maxcount);
2936
2937         if (nfserr)
2938                 return nfserr;
2939         eof = (read->rd_offset + maxcount >=
2940                read->rd_fhp->fh_dentry->d_inode->i_size);
2941
2942         WRITE32(eof);
2943         WRITE32(maxcount);
2944         ADJUST_ARGS();
2945         resp->xbuf->head[0].iov_len = (char*)p
2946                                         - (char*)resp->xbuf->head[0].iov_base;
2947         resp->xbuf->page_len = maxcount;
2948
2949         /* Use rest of head for padding and remaining ops: */
2950         resp->xbuf->tail[0].iov_base = p;
2951         resp->xbuf->tail[0].iov_len = 0;
2952         if (maxcount&3) {
2953                 RESERVE_SPACE(4);
2954                 WRITE32(0);
2955                 resp->xbuf->tail[0].iov_base += maxcount&3;
2956                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2957                 ADJUST_ARGS();
2958         }
2959         return 0;
2960 }
2961
2962 static __be32
2963 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2964 {
2965         int maxcount;
2966         char *page;
2967         __be32 *p;
2968
2969         if (nfserr)
2970                 return nfserr;
2971         if (resp->xbuf->page_len)
2972                 return nfserr_resource;
2973
2974         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2975
2976         maxcount = PAGE_SIZE;
2977         RESERVE_SPACE(4);
2978
2979         /*
2980          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2981          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2982          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2983          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2984          */
2985         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2986         if (nfserr == nfserr_isdir)
2987                 return nfserr_inval;
2988         if (nfserr)
2989                 return nfserr;
2990
2991         WRITE32(maxcount);
2992         ADJUST_ARGS();
2993         resp->xbuf->head[0].iov_len = (char*)p
2994                                 - (char*)resp->xbuf->head[0].iov_base;
2995         resp->xbuf->page_len = maxcount;
2996
2997         /* Use rest of head for padding and remaining ops: */
2998         resp->xbuf->tail[0].iov_base = p;
2999         resp->xbuf->tail[0].iov_len = 0;
3000         if (maxcount&3) {
3001                 RESERVE_SPACE(4);
3002                 WRITE32(0);
3003                 resp->xbuf->tail[0].iov_base += maxcount&3;
3004                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3005                 ADJUST_ARGS();
3006         }
3007         return 0;
3008 }
3009
3010 static __be32
3011 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3012 {
3013         int maxcount;
3014         loff_t offset;
3015         __be32 *page, *savep, *tailbase;
3016         __be32 *p;
3017
3018         if (nfserr)
3019                 return nfserr;
3020         if (resp->xbuf->page_len)
3021                 return nfserr_resource;
3022
3023         RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3024         savep = p;
3025
3026         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3027         WRITE32(0);
3028         WRITE32(0);
3029         ADJUST_ARGS();
3030         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3031         tailbase = p;
3032
3033         maxcount = PAGE_SIZE;
3034         if (maxcount > readdir->rd_maxcount)
3035                 maxcount = readdir->rd_maxcount;
3036
3037         /*
3038          * Convert from bytes to words, account for the two words already
3039          * written, make sure to leave two words at the end for the next
3040          * pointer and eof field.
3041          */
3042         maxcount = (maxcount >> 2) - 4;
3043         if (maxcount < 0) {
3044                 nfserr =  nfserr_toosmall;
3045                 goto err_no_verf;
3046         }
3047
3048         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3049         readdir->common.err = 0;
3050         readdir->buflen = maxcount;
3051         readdir->buffer = page;
3052         readdir->offset = NULL;
3053
3054         offset = readdir->rd_cookie;
3055         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3056                               &offset,
3057                               &readdir->common, nfsd4_encode_dirent);
3058         if (nfserr == nfs_ok &&
3059             readdir->common.err == nfserr_toosmall &&
3060             readdir->buffer == page)
3061                 nfserr = nfserr_toosmall;
3062         if (nfserr)
3063                 goto err_no_verf;
3064
3065         if (readdir->offset)
3066                 xdr_encode_hyper(readdir->offset, offset);
3067
3068         p = readdir->buffer;
3069         *p++ = 0;       /* no more entries */
3070         *p++ = htonl(readdir->common.err == nfserr_eof);
3071         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
3072                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
3073
3074         /* Use rest of head for padding and remaining ops: */
3075         resp->xbuf->tail[0].iov_base = tailbase;
3076         resp->xbuf->tail[0].iov_len = 0;
3077         resp->p = resp->xbuf->tail[0].iov_base;
3078         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3079
3080         return 0;
3081 err_no_verf:
3082         p = savep;
3083         ADJUST_ARGS();
3084         return nfserr;
3085 }
3086
3087 static __be32
3088 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3089 {
3090         __be32 *p;
3091
3092         if (!nfserr) {
3093                 RESERVE_SPACE(20);
3094                 write_cinfo(&p, &remove->rm_cinfo);
3095                 ADJUST_ARGS();
3096         }
3097         return nfserr;
3098 }
3099
3100 static __be32
3101 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3102 {
3103         __be32 *p;
3104
3105         if (!nfserr) {
3106                 RESERVE_SPACE(40);
3107                 write_cinfo(&p, &rename->rn_sinfo);
3108                 write_cinfo(&p, &rename->rn_tinfo);
3109                 ADJUST_ARGS();
3110         }
3111         return nfserr;
3112 }
3113
3114 static __be32
3115 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3116                          __be32 nfserr,struct svc_export *exp)
3117 {
3118         int i = 0;
3119         u32 nflavs;
3120         struct exp_flavor_info *flavs;
3121         struct exp_flavor_info def_flavs[2];
3122         __be32 *p;
3123
3124         if (nfserr)
3125                 goto out;
3126         if (exp->ex_nflavors) {
3127                 flavs = exp->ex_flavors;
3128                 nflavs = exp->ex_nflavors;
3129         } else { /* Handling of some defaults in absence of real secinfo: */
3130                 flavs = def_flavs;
3131                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3132                         nflavs = 2;
3133                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3134                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3135                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3136                         nflavs = 1;
3137                         flavs[0].pseudoflavor
3138                                         = svcauth_gss_flavor(exp->ex_client);
3139                 } else {
3140                         nflavs = 1;
3141                         flavs[0].pseudoflavor
3142                                         = exp->ex_client->flavour->flavour;
3143                 }
3144         }
3145
3146         RESERVE_SPACE(4);
3147         WRITE32(nflavs);
3148         ADJUST_ARGS();
3149         for (i = 0; i < nflavs; i++) {
3150                 u32 flav = flavs[i].pseudoflavor;
3151                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3152
3153                 if (gm) {
3154                         RESERVE_SPACE(4);
3155                         WRITE32(RPC_AUTH_GSS);
3156                         ADJUST_ARGS();
3157                         RESERVE_SPACE(4 + gm->gm_oid.len);
3158                         WRITE32(gm->gm_oid.len);
3159                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3160                         ADJUST_ARGS();
3161                         RESERVE_SPACE(4);
3162                         WRITE32(0); /* qop */
3163                         ADJUST_ARGS();
3164                         RESERVE_SPACE(4);
3165                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
3166                         ADJUST_ARGS();
3167                         gss_mech_put(gm);
3168                 } else {
3169                         RESERVE_SPACE(4);
3170                         WRITE32(flav);
3171                         ADJUST_ARGS();
3172                 }
3173         }
3174 out:
3175         if (exp)
3176                 exp_put(exp);
3177         return nfserr;
3178 }
3179
3180 static __be32
3181 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3182                      struct nfsd4_secinfo *secinfo)
3183 {
3184         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3185 }
3186
3187 static __be32
3188 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3189                      struct nfsd4_secinfo_no_name *secinfo)
3190 {
3191         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3192 }
3193
3194 /*
3195  * The SETATTR encode routine is special -- it always encodes a bitmap,
3196  * regardless of the error status.
3197  */
3198 static __be32
3199 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3200 {
3201         __be32 *p;
3202
3203         RESERVE_SPACE(12);
3204         if (nfserr) {
3205                 WRITE32(2);
3206                 WRITE32(0);
3207                 WRITE32(0);
3208         }
3209         else {
3210                 WRITE32(2);
3211                 WRITE32(setattr->sa_bmval[0]);
3212                 WRITE32(setattr->sa_bmval[1]);
3213         }
3214         ADJUST_ARGS();
3215         return nfserr;
3216 }
3217
3218 static __be32
3219 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3220 {
3221         __be32 *p;
3222
3223         if (!nfserr) {
3224                 RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3225                 WRITEMEM(&scd->se_clientid, 8);
3226                 WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3227                 ADJUST_ARGS();
3228         }
3229         else if (nfserr == nfserr_clid_inuse) {
3230                 RESERVE_SPACE(8);
3231                 WRITE32(0);
3232                 WRITE32(0);
3233                 ADJUST_ARGS();
3234         }
3235         return nfserr;
3236 }
3237
3238 static __be32
3239 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3240 {
3241         __be32 *p;
3242
3243         if (!nfserr) {
3244                 RESERVE_SPACE(16);
3245                 WRITE32(write->wr_bytes_written);
3246                 WRITE32(write->wr_how_written);
3247                 WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3248                 ADJUST_ARGS();
3249         }
3250         return nfserr;
3251 }
3252
3253 static __be32
3254 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3255                          struct nfsd4_exchange_id *exid)
3256 {
3257         __be32 *p;
3258         char *major_id;
3259         char *server_scope;
3260         int major_id_sz;
3261         int server_scope_sz;
3262         uint64_t minor_id = 0;
3263
3264         if (nfserr)
3265                 return nfserr;
3266
3267         major_id = utsname()->nodename;
3268         major_id_sz = strlen(major_id);
3269         server_scope = utsname()->nodename;
3270         server_scope_sz = strlen(server_scope);
3271
3272         RESERVE_SPACE(
3273                 8 /* eir_clientid */ +
3274                 4 /* eir_sequenceid */ +
3275                 4 /* eir_flags */ +
3276                 4 /* spr_how (SP4_NONE) */ +
3277                 8 /* so_minor_id */ +
3278                 4 /* so_major_id.len */ +
3279                 (XDR_QUADLEN(major_id_sz) * 4) +
3280                 4 /* eir_server_scope.len */ +
3281                 (XDR_QUADLEN(server_scope_sz) * 4) +
3282                 4 /* eir_server_impl_id.count (0) */);
3283
3284         WRITEMEM(&exid->clientid, 8);
3285         WRITE32(exid->seqid);
3286         WRITE32(exid->flags);
3287
3288         /* state_protect4_r. Currently only support SP4_NONE */
3289         BUG_ON(exid->spa_how != SP4_NONE);
3290         WRITE32(exid->spa_how);
3291
3292         /* The server_owner struct */
3293         WRITE64(minor_id);      /* Minor id */
3294         /* major id */
3295         WRITE32(major_id_sz);
3296         WRITEMEM(major_id, major_id_sz);
3297
3298         /* Server scope */
3299         WRITE32(server_scope_sz);
3300         WRITEMEM(server_scope, server_scope_sz);
3301
3302         /* Implementation id */
3303         WRITE32(0);     /* zero length nfs_impl_id4 array */
3304         ADJUST_ARGS();
3305         return 0;
3306 }
3307
3308 static __be32
3309 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3310                             struct nfsd4_create_session *sess)
3311 {
3312         __be32 *p;
3313
3314         if (nfserr)
3315                 return nfserr;
3316
3317         RESERVE_SPACE(24);
3318         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3319         WRITE32(sess->seqid);
3320         WRITE32(sess->flags);
3321         ADJUST_ARGS();
3322
3323         RESERVE_SPACE(28);
3324         WRITE32(0); /* headerpadsz */
3325         WRITE32(sess->fore_channel.maxreq_sz);
3326         WRITE32(sess->fore_channel.maxresp_sz);
3327         WRITE32(sess->fore_channel.maxresp_cached);
3328         WRITE32(sess->fore_channel.maxops);
3329         WRITE32(sess->fore_channel.maxreqs);
3330         WRITE32(sess->fore_channel.nr_rdma_attrs);
3331         ADJUST_ARGS();
3332
3333         if (sess->fore_channel.nr_rdma_attrs) {
3334                 RESERVE_SPACE(4);
3335                 WRITE32(sess->fore_channel.rdma_attrs);
3336                 ADJUST_ARGS();
3337         }
3338
3339         RESERVE_SPACE(28);
3340         WRITE32(0); /* headerpadsz */
3341         WRITE32(sess->back_channel.maxreq_sz);
3342         WRITE32(sess->back_channel.maxresp_sz);
3343         WRITE32(sess->back_channel.maxresp_cached);
3344         WRITE32(sess->back_channel.maxops);
3345         WRITE32(sess->back_channel.maxreqs);
3346         WRITE32(sess->back_channel.nr_rdma_attrs);
3347         ADJUST_ARGS();
3348
3349         if (sess->back_channel.nr_rdma_attrs) {
3350                 RESERVE_SPACE(4);
3351                 WRITE32(sess->back_channel.rdma_attrs);
3352                 ADJUST_ARGS();
3353         }
3354         return 0;
3355 }
3356
3357 static __be32
3358 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3359                              struct nfsd4_destroy_session *destroy_session)
3360 {
3361         return nfserr;
3362 }
3363
3364 static __be32
3365 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, int nfserr,
3366                           struct nfsd4_free_stateid *free_stateid)
3367 {
3368         __be32 *p;
3369
3370         if (nfserr)
3371                 return nfserr;
3372
3373         RESERVE_SPACE(4);
3374         WRITE32(nfserr);
3375         ADJUST_ARGS();
3376         return nfserr;
3377 }
3378
3379 static __be32
3380 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3381                       struct nfsd4_sequence *seq)
3382 {
3383         __be32 *p;
3384
3385         if (nfserr)
3386                 return nfserr;
3387
3388         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3389         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3390         WRITE32(seq->seqid);
3391         WRITE32(seq->slotid);
3392         /* Note slotid's are numbered from zero: */
3393         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3394         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3395         WRITE32(seq->status_flags);
3396
3397         ADJUST_ARGS();
3398         resp->cstate.datap = p; /* DRC cache data pointer */
3399         return 0;
3400 }
3401
3402 __be32
3403 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, int nfserr,
3404                           struct nfsd4_test_stateid *test_stateid)
3405 {
3406         struct nfsd4_test_stateid_id *stateid, *next;
3407         __be32 *p;
3408
3409         RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3410         *p++ = htonl(test_stateid->ts_num_ids);
3411
3412         list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3413                 *p++ = stateid->ts_id_status;
3414         }
3415
3416         ADJUST_ARGS();
3417         return nfserr;
3418 }
3419
3420 static __be32
3421 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3422 {
3423         return nfserr;
3424 }
3425
3426 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3427
3428 /*
3429  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3430  * since we don't need to filter out obsolete ops as this is
3431  * done in the decoding phase.
3432  */
3433 static nfsd4_enc nfsd4_enc_ops[] = {
3434         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3435         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3436         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3437         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3438         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3439         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3440         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3441         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3442         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3443         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3444         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3445         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3446         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3447         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3448         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3449         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3450         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3451         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3452         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3453         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3454         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3455         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3456         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3457         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3458         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3459         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3460         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3461         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3462         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3463         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3464         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3465         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3466         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3467         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3468         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3469         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3470         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3471
3472         /* NFSv4.1 operations */
3473         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3474         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3475         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3476         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3477         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3478         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3479         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3480         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3481         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3482         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3483         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3484         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3485         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3486         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3487         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3488         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3489         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3490         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3491         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3492 };
3493
3494 /*
3495  * Calculate the total amount of memory that the compound response has taken
3496  * after encoding the current operation with pad.
3497  *
3498  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3499  *      which was specified at nfsd4_operation, else pad is zero.
3500  *
3501  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3502  *
3503  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3504  * will be at least a page and will therefore hold the xdr_buf head.
3505  */
3506 int nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3507 {
3508         struct xdr_buf *xb = &resp->rqstp->rq_res;
3509         struct nfsd4_session *session = NULL;
3510         struct nfsd4_slot *slot = resp->cstate.slot;
3511         u32 length, tlen = 0;
3512
3513         if (!nfsd4_has_session(&resp->cstate))
3514                 return 0;
3515
3516         session = resp->cstate.session;
3517         if (session == NULL)
3518                 return 0;
3519
3520         if (xb->page_len == 0) {
3521                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3522         } else {
3523                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3524                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3525
3526                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3527         }
3528         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3529                 length, xb->page_len, tlen, pad);
3530
3531         if (length > session->se_fchannel.maxresp_sz)
3532                 return nfserr_rep_too_big;
3533
3534         if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3535             length > session->se_fchannel.maxresp_cached)
3536                 return nfserr_rep_too_big_to_cache;
3537
3538         return 0;
3539 }
3540
3541 void
3542 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3543 {
3544         __be32 *statp;
3545         __be32 *p;
3546
3547         RESERVE_SPACE(8);
3548         WRITE32(op->opnum);
3549         statp = p++;    /* to be backfilled at the end */
3550         ADJUST_ARGS();
3551
3552         if (op->opnum == OP_ILLEGAL)
3553                 goto status;
3554         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3555                !nfsd4_enc_ops[op->opnum]);
3556         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3557         /* nfsd4_check_drc_limit guarantees enough room for error status */
3558         if (!op->status)
3559                 op->status = nfsd4_check_resp_size(resp, 0);
3560 status:
3561         /*
3562          * Note: We write the status directly, instead of using WRITE32(),
3563          * since it is already in network byte order.
3564          */
3565         *statp = op->status;
3566 }
3567
3568 /*
3569  * Encode the reply stored in the stateowner reply cache
3570  *
3571  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3572  * previously sent already encoded operation.
3573  *
3574  * called with nfs4_lock_state() held
3575  */
3576 void
3577 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3578 {
3579         __be32 *p;
3580         struct nfs4_replay *rp = op->replay;
3581
3582         BUG_ON(!rp);
3583
3584         RESERVE_SPACE(8);
3585         WRITE32(op->opnum);
3586         *p++ = rp->rp_status;  /* already xdr'ed */
3587         ADJUST_ARGS();
3588
3589         RESERVE_SPACE(rp->rp_buflen);
3590         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3591         ADJUST_ARGS();
3592 }
3593
3594 int
3595 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3596 {
3597         return xdr_ressize_check(rqstp, p);
3598 }
3599
3600 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3601 {
3602         struct svc_rqst *rqstp = rq;
3603         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3604
3605         if (args->ops != args->iops) {
3606                 kfree(args->ops);
3607                 args->ops = args->iops;
3608         }
3609         kfree(args->tmpp);
3610         args->tmpp = NULL;
3611         while (args->to_free) {
3612                 struct tmpbuf *tb = args->to_free;
3613                 args->to_free = tb->next;
3614                 tb->release(tb->buf);
3615                 kfree(tb);
3616         }
3617         return 1;
3618 }
3619
3620 int
3621 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3622 {
3623         args->p = p;
3624         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3625         args->pagelist = rqstp->rq_arg.pages;
3626         args->pagelen = rqstp->rq_arg.page_len;
3627         args->tmpp = NULL;
3628         args->to_free = NULL;
3629         args->ops = args->iops;
3630         args->rqstp = rqstp;
3631
3632         return !nfsd4_decode_compound(args);
3633 }
3634
3635 int
3636 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3637 {
3638         /*
3639          * All that remains is to write the tag and operation count...
3640          */
3641         struct nfsd4_compound_state *cs = &resp->cstate;
3642         struct kvec *iov;
3643         p = resp->tagp;
3644         *p++ = htonl(resp->taglen);
3645         memcpy(p, resp->tag, resp->taglen);
3646         p += XDR_QUADLEN(resp->taglen);
3647         *p++ = htonl(resp->opcnt);
3648
3649         if (rqstp->rq_res.page_len)
3650                 iov = &rqstp->rq_res.tail[0];
3651         else
3652                 iov = &rqstp->rq_res.head[0];
3653         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3654         BUG_ON(iov->iov_len > PAGE_SIZE);
3655         if (nfsd4_has_session(cs)) {
3656                 if (cs->status != nfserr_replay_cache) {
3657                         nfsd4_store_cache_entry(resp);
3658                         cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3659                 }
3660                 /* Renew the clientid on success and on replay */
3661                 release_session_client(cs->session);
3662                 nfsd4_put_session(cs->session);
3663         }
3664         return 1;
3665 }
3666
3667 /*
3668  * Local variables:
3669  *  c-basic-offset: 8
3670  * End:
3671  */