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 void save_buf(struct nfsd4_compoundargs *argp, struct nfsd4_saved_compoundargs *savep)
 137 {
 138         savep->p        = argp->p;
 139         savep->end      = argp->end;
 140         savep->pagelen  = argp->pagelen;
 141         savep->pagelist = argp->pagelist;
 142 }
 143
 144 static void restore_buf(struct nfsd4_compoundargs *argp, struct nfsd4_saved_compoundargs *savep)
 145 {
 146         argp->p        = savep->p;
 147         argp->end      = savep->end;
 148         argp->pagelen  = savep->pagelen;
 149         argp->pagelist = savep->pagelist;
 150 }
 151
 152 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 153 {
 154         /* We want more bytes than seem to be available.
 155          * Maybe we need a new page, maybe we have just run out
 156          */
 157         unsigned int avail = (char *)argp->end - (char *)argp->p;
 158         __be32 *p;
 159         if (avail + argp->pagelen < nbytes)
 160                 return NULL;
 161         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 162                 return NULL;
 163         /* ok, we can do it with the current plus the next page */
 164         if (nbytes <= sizeof(argp->tmp))
 165                 p = argp->tmp;
 166         else {
 167                 kfree(argp->tmpp);
 168                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 169                 if (!p)
 170                         return NULL;
 171
 172         }
 173         /*
 174          * The following memcpy is safe because read_buf is always
 175          * called with nbytes > avail, and the two cases above both
 176          * guarantee p points to at least nbytes bytes.
 177          */
 178         memcpy(p, argp->p, avail);
 179         /* step to next page */
 180         argp->p = page_address(argp->pagelist[0]);
 181         argp->pagelist++;
 182         if (argp->pagelen < PAGE_SIZE) {
 183                 argp->end = argp->p + (argp->pagelen>>2);
 184                 argp->pagelen = 0;
 185         } else {
 186                 argp->end = argp->p + (PAGE_SIZE>>2);
 187                 argp->pagelen -= PAGE_SIZE;
 188         }
 189         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 190         argp->p += XDR_QUADLEN(nbytes - avail);
 191         return p;
 192 }
 193
 194 static int zero_clientid(clientid_t *clid)
 195 {
 196         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 197 }
 198
 199 static int
 200 defer_free(struct nfsd4_compoundargs *argp,
 201                 void (*release)(const void *), void *p)
 202 {
 203         struct tmpbuf *tb;
 204
 205         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 206         if (!tb)
 207                 return -ENOMEM;
 208         tb->buf = p;
 209         tb->release = release;
 210         tb->next = argp->to_free;
 211         argp->to_free = tb;
 212         return 0;
 213 }
 214
 215 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 216 {
 217         if (p == argp->tmp) {
 218                 p = kmalloc(nbytes, GFP_KERNEL);
 219                 if (!p)
 220                         return NULL;
 221                 memcpy(p, argp->tmp, nbytes);
 222         } else {
 223                 BUG_ON(p != argp->tmpp);
 224                 argp->tmpp = NULL;
 225         }
 226         if (defer_free(argp, kfree, p)) {
 227                 kfree(p);
 228                 return NULL;
 229         } else
 230                 return (char *)p;
 231 }
 232
 233 static __be32
 234 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 235 {
 236         u32 bmlen;
 237         DECODE_HEAD;
 238
 239         bmval[0] = 0;
 240         bmval[1] = 0;
 241         bmval[2] = 0;
 242
 243         READ_BUF(4);
 244         READ32(bmlen);
 245         if (bmlen > 1000)
 246                 goto xdr_error;
 247
 248         READ_BUF(bmlen << 2);
 249         if (bmlen > 0)
 250                 READ32(bmval[0]);
 251         if (bmlen > 1)
 252                 READ32(bmval[1]);
 253         if (bmlen > 2)
 254                 READ32(bmval[2]);
 255
 256         DECODE_TAIL;
 257 }
 258
 259 static __be32
 260 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 261                    struct iattr *iattr, struct nfs4_acl **acl)
 262 {
 263         int expected_len, len = 0;
 264         u32 dummy32;
 265         char *buf;
 266         int host_err;
 267
 268         DECODE_HEAD;
 269         iattr->ia_valid = 0;
 270         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 271                 return status;
 272
 273         READ_BUF(4);
 274         READ32(expected_len);
 275
 276         if (bmval[0] & FATTR4_WORD0_SIZE) {
 277                 READ_BUF(8);
 278                 len += 8;
 279                 READ64(iattr->ia_size);
 280                 iattr->ia_valid |= ATTR_SIZE;
 281         }
 282         if (bmval[0] & FATTR4_WORD0_ACL) {
 283                 u32 nace;
 284                 struct nfs4_ace *ace;
 285
 286                 READ_BUF(4); len += 4;
 287                 READ32(nace);
 288
 289                 if (nace > NFS4_ACL_MAX)
 290                         return nfserr_resource;
 291
 292                 *acl = nfs4_acl_new(nace);
 293                 if (*acl == NULL) {
 294                         host_err = -ENOMEM;
 295                         goto out_nfserr;
 296                 }
 297                 defer_free(argp, kfree, *acl);
 298
 299                 (*acl)->naces = nace;
 300                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 301                         READ_BUF(16); len += 16;
 302                         READ32(ace->type);
 303                         READ32(ace->flag);
 304                         READ32(ace->access_mask);
 305                         READ32(dummy32);
 306                         READ_BUF(dummy32);
 307                         len += XDR_QUADLEN(dummy32) << 2;
 308                         READMEM(buf, dummy32);
 309                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 310                         status = nfs_ok;
 311                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 312                                 ace->who = 0;
 313                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 314                                 status = nfsd_map_name_to_gid(argp->rqstp,
 315                                                 buf, dummy32, &ace->who);
 316                         else
 317                                 status = nfsd_map_name_to_uid(argp->rqstp,
 318                                                 buf, dummy32, &ace->who);
 319                         if (status)
 320                                 return status;
 321                 }
 322         } else
 323                 *acl = NULL;
 324         if (bmval[1] & FATTR4_WORD1_MODE) {
 325                 READ_BUF(4);
 326                 len += 4;
 327                 READ32(iattr->ia_mode);
 328                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 329                 iattr->ia_valid |= ATTR_MODE;
 330         }
 331         if (bmval[1] & FATTR4_WORD1_OWNER) {
 332                 READ_BUF(4);
 333                 len += 4;
 334                 READ32(dummy32);
 335                 READ_BUF(dummy32);
 336                 len += (XDR_QUADLEN(dummy32) << 2);
 337                 READMEM(buf, dummy32);
 338                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 339                         return status;
 340                 iattr->ia_valid |= ATTR_UID;
 341         }
 342         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 343                 READ_BUF(4);
 344                 len += 4;
 345                 READ32(dummy32);
 346                 READ_BUF(dummy32);
 347                 len += (XDR_QUADLEN(dummy32) << 2);
 348                 READMEM(buf, dummy32);
 349                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 350                         return status;
 351                 iattr->ia_valid |= ATTR_GID;
 352         }
 353         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 354                 READ_BUF(4);
 355                 len += 4;
 356                 READ32(dummy32);
 357                 switch (dummy32) {
 358                 case NFS4_SET_TO_CLIENT_TIME:
 359                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 360                            all 32 bits of 'nseconds'. */
 361                         READ_BUF(12);
 362                         len += 12;
 363                         READ64(iattr->ia_atime.tv_sec);
 364                         READ32(iattr->ia_atime.tv_nsec);
 365                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 366                                 return nfserr_inval;
 367                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 368                         break;
 369                 case NFS4_SET_TO_SERVER_TIME:
 370                         iattr->ia_valid |= ATTR_ATIME;
 371                         break;
 372                 default:
 373                         goto xdr_error;
 374                 }
 375         }
 376         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 377                 READ_BUF(4);
 378                 len += 4;
 379                 READ32(dummy32);
 380                 switch (dummy32) {
 381                 case NFS4_SET_TO_CLIENT_TIME:
 382                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 383                            all 32 bits of 'nseconds'. */
 384                         READ_BUF(12);
 385                         len += 12;
 386                         READ64(iattr->ia_mtime.tv_sec);
 387                         READ32(iattr->ia_mtime.tv_nsec);
 388                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 389                                 return nfserr_inval;
 390                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 391                         break;
 392                 case NFS4_SET_TO_SERVER_TIME:
 393                         iattr->ia_valid |= ATTR_MTIME;
 394                         break;
 395                 default:
 396                         goto xdr_error;
 397                 }
 398         }
 399         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 400             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 401             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 402                 READ_BUF(expected_len - len);
 403         else if (len != expected_len)
 404                 goto xdr_error;
 405
 406         DECODE_TAIL;
 407
 408 out_nfserr:
 409         status = nfserrno(host_err);
 410         goto out;
 411 }
 412
 413 static __be32
 414 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 415 {
 416         DECODE_HEAD;
 417
 418         READ_BUF(sizeof(stateid_t));
 419         READ32(sid->si_generation);
 420         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 421
 422         DECODE_TAIL;
 423 }
 424
 425 static __be32
 426 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 427 {
 428         DECODE_HEAD;
 429
 430         READ_BUF(4);
 431         READ32(access->ac_req_access);
 432
 433         DECODE_TAIL;
 434 }
 435
 436 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 437 {
 438         DECODE_HEAD;
 439
 440         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 441         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 442         READ32(bcts->dir);
 443         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 444          * could help us figure out we should be using it. */
 445         DECODE_TAIL;
 446 }
 447
 448 static __be32
 449 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 450 {
 451         DECODE_HEAD;
 452
 453         READ_BUF(4);
 454         READ32(close->cl_seqid);
 455         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 456
 457         DECODE_TAIL;
 458 }
 459
 460
 461 static __be32
 462 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 463 {
 464         DECODE_HEAD;
 465
 466         READ_BUF(12);
 467         READ64(commit->co_offset);
 468         READ32(commit->co_count);
 469
 470         DECODE_TAIL;
 471 }
 472
 473 static __be32
 474 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 475 {
 476         DECODE_HEAD;
 477
 478         READ_BUF(4);
 479         READ32(create->cr_type);
 480         switch (create->cr_type) {
 481         case NF4LNK:
 482                 READ_BUF(4);
 483                 READ32(create->cr_linklen);
 484                 READ_BUF(create->cr_linklen);
 485                 /*
 486                  * The VFS will want a null-terminated string, and
 487                  * null-terminating in place isn't safe since this might
 488                  * end on a page boundary:
 489                  */
 490                 create->cr_linkname =
 491                                 kmalloc(create->cr_linklen + 1, GFP_KERNEL);
 492                 if (!create->cr_linkname)
 493                         return nfserr_jukebox;
 494                 memcpy(create->cr_linkname, p, create->cr_linklen);
 495                 create->cr_linkname[create->cr_linklen] = '\0';
 496                 defer_free(argp, kfree, create->cr_linkname);
 497                 break;
 498         case NF4BLK:
 499         case NF4CHR:
 500                 READ_BUF(8);
 501                 READ32(create->cr_specdata1);
 502                 READ32(create->cr_specdata2);
 503                 break;
 504         case NF4SOCK:
 505         case NF4FIFO:
 506         case NF4DIR:
 507         default:
 508                 break;
 509         }
 510
 511         READ_BUF(4);
 512         READ32(create->cr_namelen);
 513         READ_BUF(create->cr_namelen);
 514         SAVEMEM(create->cr_name, create->cr_namelen);
 515         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 516                 return status;
 517
 518         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 519                                     &create->cr_acl);
 520         if (status)
 521                 goto out;
 522
 523         DECODE_TAIL;
 524 }
 525
 526 static inline __be32
 527 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 528 {
 529         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 530 }
 531
 532 static inline __be32
 533 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 534 {
 535         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 536 }
 537
 538 static __be32
 539 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 540 {
 541         DECODE_HEAD;
 542
 543         READ_BUF(4);
 544         READ32(link->li_namelen);
 545         READ_BUF(link->li_namelen);
 546         SAVEMEM(link->li_name, link->li_namelen);
 547         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 548                 return status;
 549
 550         DECODE_TAIL;
 551 }
 552
 553 static __be32
 554 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 555 {
 556         DECODE_HEAD;
 557
 558         /*
 559         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 560         */
 561         READ_BUF(28);
 562         READ32(lock->lk_type);
 563         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 564                 goto xdr_error;
 565         READ32(lock->lk_reclaim);
 566         READ64(lock->lk_offset);
 567         READ64(lock->lk_length);
 568         READ32(lock->lk_is_new);
 569
 570         if (lock->lk_is_new) {
 571                 READ_BUF(4);
 572                 READ32(lock->lk_new_open_seqid);
 573                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 574                 if (status)
 575                         return status;
 576                 READ_BUF(8 + sizeof(clientid_t));
 577                 READ32(lock->lk_new_lock_seqid);
 578                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 579                 READ32(lock->lk_new_owner.len);
 580                 READ_BUF(lock->lk_new_owner.len);
 581                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 582         } else {
 583                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 584                 if (status)
 585                         return status;
 586                 READ_BUF(4);
 587                 READ32(lock->lk_old_lock_seqid);
 588         }
 589
 590         DECODE_TAIL;
 591 }
 592
 593 static __be32
 594 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 595 {
 596         DECODE_HEAD;
 597
 598         READ_BUF(32);
 599         READ32(lockt->lt_type);
 600         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 601                 goto xdr_error;
 602         READ64(lockt->lt_offset);
 603         READ64(lockt->lt_length);
 604         COPYMEM(&lockt->lt_clientid, 8);
 605         READ32(lockt->lt_owner.len);
 606         READ_BUF(lockt->lt_owner.len);
 607         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 608
 609         DECODE_TAIL;
 610 }
 611
 612 static __be32
 613 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 614 {
 615         DECODE_HEAD;
 616
 617         READ_BUF(8);
 618         READ32(locku->lu_type);
 619         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 620                 goto xdr_error;
 621         READ32(locku->lu_seqid);
 622         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 623         if (status)
 624                 return status;
 625         READ_BUF(16);
 626         READ64(locku->lu_offset);
 627         READ64(locku->lu_length);
 628
 629         DECODE_TAIL;
 630 }
 631
 632 static __be32
 633 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 634 {
 635         DECODE_HEAD;
 636
 637         READ_BUF(4);
 638         READ32(lookup->lo_len);
 639         READ_BUF(lookup->lo_len);
 640         SAVEMEM(lookup->lo_name, lookup->lo_len);
 641         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 642                 return status;
 643
 644         DECODE_TAIL;
 645 }
 646
 647 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *x)
 648 {
 649         __be32 *p;
 650         u32 w;
 651
 652         READ_BUF(4);
 653         READ32(w);
 654         *x = w;
 655         switch (w & NFS4_SHARE_ACCESS_MASK) {
 656         case NFS4_SHARE_ACCESS_READ:
 657         case NFS4_SHARE_ACCESS_WRITE:
 658         case NFS4_SHARE_ACCESS_BOTH:
 659                 break;
 660         default:
 661                 return nfserr_bad_xdr;
 662         }
 663         w &= ~NFS4_SHARE_ACCESS_MASK;
 664         if (!w)
 665                 return nfs_ok;
 666         if (!argp->minorversion)
 667                 return nfserr_bad_xdr;
 668         switch (w & NFS4_SHARE_WANT_MASK) {
 669         case NFS4_SHARE_WANT_NO_PREFERENCE:
 670         case NFS4_SHARE_WANT_READ_DELEG:
 671         case NFS4_SHARE_WANT_WRITE_DELEG:
 672         case NFS4_SHARE_WANT_ANY_DELEG:
 673         case NFS4_SHARE_WANT_NO_DELEG:
 674         case NFS4_SHARE_WANT_CANCEL:
 675                 break;
 676         default:
 677                 return nfserr_bad_xdr;
 678         }
 679         w &= ~NFS4_SHARE_WANT_MASK;
 680         if (!w)
 681                 return nfs_ok;
 682         switch (w) {
 683         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 684         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 685         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 686               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 687                 return nfs_ok;
 688         }
 689 xdr_error:
 690         return nfserr_bad_xdr;
 691 }
 692
 693 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 694 {
 695         __be32 *p;
 696
 697         READ_BUF(4);
 698         READ32(*x);
 699         /* Note: unlinke access bits, deny bits may be zero. */
 700         if (*x & ~NFS4_SHARE_DENY_BOTH)
 701                 return nfserr_bad_xdr;
 702         return nfs_ok;
 703 xdr_error:
 704         return nfserr_bad_xdr;
 705 }
 706
 707 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 708 {
 709         __be32 *p;
 710
 711         READ_BUF(4);
 712         READ32(o->len);
 713
 714         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 715                 return nfserr_bad_xdr;
 716
 717         READ_BUF(o->len);
 718         SAVEMEM(o->data, o->len);
 719         return nfs_ok;
 720 xdr_error:
 721         return nfserr_bad_xdr;
 722 }
 723
 724 static __be32
 725 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 726 {
 727         DECODE_HEAD;
 728
 729         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 730         open->op_iattr.ia_valid = 0;
 731         open->op_openowner = NULL;
 732
 733         /* seqid, share_access, share_deny, clientid, ownerlen */
 734         READ_BUF(4);
 735         READ32(open->op_seqid);
 736         status = nfsd4_decode_share_access(argp, &open->op_share_access);
 737         if (status)
 738                 goto xdr_error;
 739         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 740         if (status)
 741                 goto xdr_error;
 742         READ_BUF(sizeof(clientid_t));
 743         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 744         status = nfsd4_decode_opaque(argp, &open->op_owner);
 745         if (status)
 746                 goto xdr_error;
 747         READ_BUF(4);
 748         READ32(open->op_create);
 749         switch (open->op_create) {
 750         case NFS4_OPEN_NOCREATE:
 751                 break;
 752         case NFS4_OPEN_CREATE:
 753                 READ_BUF(4);
 754                 READ32(open->op_createmode);
 755                 switch (open->op_createmode) {
 756                 case NFS4_CREATE_UNCHECKED:
 757                 case NFS4_CREATE_GUARDED:
 758                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 759                                 &open->op_iattr, &open->op_acl);
 760                         if (status)
 761                                 goto out;
 762                         break;
 763                 case NFS4_CREATE_EXCLUSIVE:
 764                         READ_BUF(8);
 765                         COPYMEM(open->op_verf.data, 8);
 766                         break;
 767                 case NFS4_CREATE_EXCLUSIVE4_1:
 768                         if (argp->minorversion < 1)
 769                                 goto xdr_error;
 770                         READ_BUF(8);
 771                         COPYMEM(open->op_verf.data, 8);
 772                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 773                                 &open->op_iattr, &open->op_acl);
 774                         if (status)
 775                                 goto out;
 776                         break;
 777                 default:
 778                         goto xdr_error;
 779                 }
 780                 break;
 781         default:
 782                 goto xdr_error;
 783         }
 784
 785         /* open_claim */
 786         READ_BUF(4);
 787         READ32(open->op_claim_type);
 788         switch (open->op_claim_type) {
 789         case NFS4_OPEN_CLAIM_NULL:
 790         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 791                 READ_BUF(4);
 792                 READ32(open->op_fname.len);
 793                 READ_BUF(open->op_fname.len);
 794                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 795                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 796                         return status;
 797                 break;
 798         case NFS4_OPEN_CLAIM_PREVIOUS:
 799                 READ_BUF(4);
 800                 READ32(open->op_delegate_type);
 801                 break;
 802         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 803                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 804                 if (status)
 805                         return status;
 806                 READ_BUF(4);
 807                 READ32(open->op_fname.len);
 808                 READ_BUF(open->op_fname.len);
 809                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 810                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 811                         return status;
 812                 break;
 813         case NFS4_OPEN_CLAIM_FH:
 814         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 815                 if (argp->minorversion < 1)
 816                         goto xdr_error;
 817                 /* void */
 818                 break;
 819         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 820                 if (argp->minorversion < 1)
 821                         goto xdr_error;
 822                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 823                 if (status)
 824                         return status;
 825                 break;
 826         default:
 827                 goto xdr_error;
 828         }
 829
 830         DECODE_TAIL;
 831 }
 832
 833 static __be32
 834 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 835 {
 836         DECODE_HEAD;
 837
 838         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 839         if (status)
 840                 return status;
 841         READ_BUF(4);
 842         READ32(open_conf->oc_seqid);
 843
 844         DECODE_TAIL;
 845 }
 846
 847 static __be32
 848 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 849 {
 850         DECODE_HEAD;
 851
 852         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 853         if (status)
 854                 return status;
 855         READ_BUF(4);
 856         READ32(open_down->od_seqid);
 857         status = nfsd4_decode_share_access(argp, &open_down->od_share_access);
 858         if (status)
 859                 return status;
 860         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 861         if (status)
 862                 return status;
 863         DECODE_TAIL;
 864 }
 865
 866 static __be32
 867 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 868 {
 869         DECODE_HEAD;
 870
 871         READ_BUF(4);
 872         READ32(putfh->pf_fhlen);
 873         if (putfh->pf_fhlen > NFS4_FHSIZE)
 874                 goto xdr_error;
 875         READ_BUF(putfh->pf_fhlen);
 876         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 877
 878         DECODE_TAIL;
 879 }
 880
 881 static __be32
 882 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 883 {
 884         DECODE_HEAD;
 885
 886         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 887         if (status)
 888                 return status;
 889         READ_BUF(12);
 890         READ64(read->rd_offset);
 891         READ32(read->rd_length);
 892
 893         DECODE_TAIL;
 894 }
 895
 896 static __be32
 897 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 898 {
 899         DECODE_HEAD;
 900
 901         READ_BUF(24);
 902         READ64(readdir->rd_cookie);
 903         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 904         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 905         READ32(readdir->rd_maxcount);
 906         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 907                 goto out;
 908
 909         DECODE_TAIL;
 910 }
 911
 912 static __be32
 913 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 914 {
 915         DECODE_HEAD;
 916
 917         READ_BUF(4);
 918         READ32(remove->rm_namelen);
 919         READ_BUF(remove->rm_namelen);
 920         SAVEMEM(remove->rm_name, remove->rm_namelen);
 921         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 922                 return status;
 923
 924         DECODE_TAIL;
 925 }
 926
 927 static __be32
 928 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 929 {
 930         DECODE_HEAD;
 931
 932         READ_BUF(4);
 933         READ32(rename->rn_snamelen);
 934         READ_BUF(rename->rn_snamelen);
 935         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 936         READ_BUF(4);
 937         READ32(rename->rn_tnamelen);
 938         READ_BUF(rename->rn_tnamelen);
 939         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 940         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 941                 return status;
 942         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 943                 return status;
 944
 945         DECODE_TAIL;
 946 }
 947
 948 static __be32
 949 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 950 {
 951         DECODE_HEAD;
 952
 953         READ_BUF(sizeof(clientid_t));
 954         COPYMEM(clientid, sizeof(clientid_t));
 955
 956         DECODE_TAIL;
 957 }
 958
 959 static __be32
 960 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 961                      struct nfsd4_secinfo *secinfo)
 962 {
 963         DECODE_HEAD;
 964
 965         READ_BUF(4);
 966         READ32(secinfo->si_namelen);
 967         READ_BUF(secinfo->si_namelen);
 968         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 969         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 970                                                                 nfserr_noent);
 971         if (status)
 972                 return status;
 973         DECODE_TAIL;
 974 }
 975
 976 static __be32
 977 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
 978                      struct nfsd4_secinfo_no_name *sin)
 979 {
 980         DECODE_HEAD;
 981
 982         READ_BUF(4);
 983         READ32(sin->sin_style);
 984         DECODE_TAIL;
 985 }
 986
 987 static __be32
 988 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 989 {
 990         __be32 status;
 991
 992         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 993         if (status)
 994                 return status;
 995         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 996                                   &setattr->sa_acl);
 997 }
 998
 999 static __be32
1000 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
1001 {
1002         DECODE_HEAD;
1003
1004         READ_BUF(8);
1005         COPYMEM(setclientid->se_verf.data, 8);
1006
1007         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1008         if (status)
1009                 return nfserr_bad_xdr;
1010         READ_BUF(8);
1011         READ32(setclientid->se_callback_prog);
1012         READ32(setclientid->se_callback_netid_len);
1013         READ_BUF(setclientid->se_callback_netid_len);
1014         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1015         READ_BUF(4);
1016         READ32(setclientid->se_callback_addr_len);
1017
1018         READ_BUF(setclientid->se_callback_addr_len);
1019         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1020         READ_BUF(4);
1021         READ32(setclientid->se_callback_ident);
1022
1023         DECODE_TAIL;
1024 }
1025
1026 static __be32
1027 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1028 {
1029         DECODE_HEAD;
1030
1031         READ_BUF(8 + sizeof(nfs4_verifier));
1032         COPYMEM(&scd_c->sc_clientid, 8);
1033         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
1034
1035         DECODE_TAIL;
1036 }
1037
1038 /* Also used for NVERIFY */
1039 static __be32
1040 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1041 {
1042 #if 0
1043         struct nfsd4_compoundargs save = {
1044                 .p = argp->p,
1045                 .end = argp->end,
1046                 .rqstp = argp->rqstp,
1047         };
1048         u32             ve_bmval[2];
1049         struct iattr    ve_iattr;           /* request */
1050         struct nfs4_acl *ve_acl;            /* request */
1051 #endif
1052         DECODE_HEAD;
1053
1054         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1055                 goto out;
1056
1057         /* For convenience's sake, we compare raw xdr'd attributes in
1058          * nfsd4_proc_verify; however we still decode here just to return
1059          * correct error in case of bad xdr. */
1060 #if 0
1061         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1062         if (status == nfserr_inval) {
1063                 status = nfserrno(status);
1064                 goto out;
1065         }
1066 #endif
1067         READ_BUF(4);
1068         READ32(verify->ve_attrlen);
1069         READ_BUF(verify->ve_attrlen);
1070         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1071
1072         DECODE_TAIL;
1073 }
1074
1075 static __be32
1076 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1077 {
1078         int avail;
1079         int v;
1080         int len;
1081         DECODE_HEAD;
1082
1083         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1084         if (status)
1085                 return status;
1086         READ_BUF(16);
1087         READ64(write->wr_offset);
1088         READ32(write->wr_stable_how);
1089         if (write->wr_stable_how > 2)
1090                 goto xdr_error;
1091         READ32(write->wr_buflen);
1092
1093         /* Sorry .. no magic macros for this.. *
1094          * READ_BUF(write->wr_buflen);
1095          * SAVEMEM(write->wr_buf, write->wr_buflen);
1096          */
1097         avail = (char*)argp->end - (char*)argp->p;
1098         if (avail + argp->pagelen < write->wr_buflen) {
1099                 dprintk("NFSD: xdr error (%s:%d)\n",
1100                                 __FILE__, __LINE__);
1101                 goto xdr_error;
1102         }
1103         argp->rqstp->rq_vec[0].iov_base = p;
1104         argp->rqstp->rq_vec[0].iov_len = avail;
1105         v = 0;
1106         len = write->wr_buflen;
1107         while (len > argp->rqstp->rq_vec[v].iov_len) {
1108                 len -= argp->rqstp->rq_vec[v].iov_len;
1109                 v++;
1110                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
1111                 argp->pagelist++;
1112                 if (argp->pagelen >= PAGE_SIZE) {
1113                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1114                         argp->pagelen -= PAGE_SIZE;
1115                 } else {
1116                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1117                         argp->pagelen -= len;
1118                 }
1119         }
1120         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1121         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1122         argp->rqstp->rq_vec[v].iov_len = len;
1123         write->wr_vlen = v+1;
1124
1125         DECODE_TAIL;
1126 }
1127
1128 static __be32
1129 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1130 {
1131         DECODE_HEAD;
1132
1133         READ_BUF(12);
1134         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1135         READ32(rlockowner->rl_owner.len);
1136         READ_BUF(rlockowner->rl_owner.len);
1137         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1138
1139         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1140                 return nfserr_inval;
1141         DECODE_TAIL;
1142 }
1143
1144 static __be32
1145 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1146                          struct nfsd4_exchange_id *exid)
1147 {
1148         int dummy, tmp;
1149         DECODE_HEAD;
1150
1151         READ_BUF(NFS4_VERIFIER_SIZE);
1152         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1153
1154         status = nfsd4_decode_opaque(argp, &exid->clname);
1155         if (status)
1156                 return nfserr_bad_xdr;
1157
1158         READ_BUF(4);
1159         READ32(exid->flags);
1160
1161         /* Ignore state_protect4_a */
1162         READ_BUF(4);
1163         READ32(exid->spa_how);
1164         switch (exid->spa_how) {
1165         case SP4_NONE:
1166                 break;
1167         case SP4_MACH_CRED:
1168                 /* spo_must_enforce */
1169                 READ_BUF(4);
1170                 READ32(dummy);
1171                 READ_BUF(dummy * 4);
1172                 p += dummy;
1173
1174                 /* spo_must_allow */
1175                 READ_BUF(4);
1176                 READ32(dummy);
1177                 READ_BUF(dummy * 4);
1178                 p += dummy;
1179                 break;
1180         case SP4_SSV:
1181                 /* ssp_ops */
1182                 READ_BUF(4);
1183                 READ32(dummy);
1184                 READ_BUF(dummy * 4);
1185                 p += dummy;
1186
1187                 READ_BUF(4);
1188                 READ32(dummy);
1189                 READ_BUF(dummy * 4);
1190                 p += dummy;
1191
1192                 /* ssp_hash_algs<> */
1193                 READ_BUF(4);
1194                 READ32(tmp);
1195                 while (tmp--) {
1196                         READ_BUF(4);
1197                         READ32(dummy);
1198                         READ_BUF(dummy);
1199                         p += XDR_QUADLEN(dummy);
1200                 }
1201
1202                 /* ssp_encr_algs<> */
1203                 READ_BUF(4);
1204                 READ32(tmp);
1205                 while (tmp--) {
1206                         READ_BUF(4);
1207                         READ32(dummy);
1208                         READ_BUF(dummy);
1209                         p += XDR_QUADLEN(dummy);
1210                 }
1211
1212                 /* ssp_window and ssp_num_gss_handles */
1213                 READ_BUF(8);
1214                 READ32(dummy);
1215                 READ32(dummy);
1216                 break;
1217         default:
1218                 goto xdr_error;
1219         }
1220
1221         /* Ignore Implementation ID */
1222         READ_BUF(4);    /* nfs_impl_id4 array length */
1223         READ32(dummy);
1224
1225         if (dummy > 1)
1226                 goto xdr_error;
1227
1228         if (dummy == 1) {
1229                 /* nii_domain */
1230                 READ_BUF(4);
1231                 READ32(dummy);
1232                 READ_BUF(dummy);
1233                 p += XDR_QUADLEN(dummy);
1234
1235                 /* nii_name */
1236                 READ_BUF(4);
1237                 READ32(dummy);
1238                 READ_BUF(dummy);
1239                 p += XDR_QUADLEN(dummy);
1240
1241                 /* nii_date */
1242                 READ_BUF(12);
1243                 p += 3;
1244         }
1245         DECODE_TAIL;
1246 }
1247
1248 static __be32
1249 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1250                             struct nfsd4_create_session *sess)
1251 {
1252         DECODE_HEAD;
1253
1254         u32 dummy;
1255         char *machine_name;
1256         int i;
1257         int nr_secflavs;
1258
1259         READ_BUF(16);
1260         COPYMEM(&sess->clientid, 8);
1261         READ32(sess->seqid);
1262         READ32(sess->flags);
1263
1264         /* Fore channel attrs */
1265         READ_BUF(28);
1266         READ32(dummy); /* headerpadsz is always 0 */
1267         READ32(sess->fore_channel.maxreq_sz);
1268         READ32(sess->fore_channel.maxresp_sz);
1269         READ32(sess->fore_channel.maxresp_cached);
1270         READ32(sess->fore_channel.maxops);
1271         READ32(sess->fore_channel.maxreqs);
1272         READ32(sess->fore_channel.nr_rdma_attrs);
1273         if (sess->fore_channel.nr_rdma_attrs == 1) {
1274                 READ_BUF(4);
1275                 READ32(sess->fore_channel.rdma_attrs);
1276         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1277                 dprintk("Too many fore channel attr bitmaps!\n");
1278                 goto xdr_error;
1279         }
1280
1281         /* Back channel attrs */
1282         READ_BUF(28);
1283         READ32(dummy); /* headerpadsz is always 0 */
1284         READ32(sess->back_channel.maxreq_sz);
1285         READ32(sess->back_channel.maxresp_sz);
1286         READ32(sess->back_channel.maxresp_cached);
1287         READ32(sess->back_channel.maxops);
1288         READ32(sess->back_channel.maxreqs);
1289         READ32(sess->back_channel.nr_rdma_attrs);
1290         if (sess->back_channel.nr_rdma_attrs == 1) {
1291                 READ_BUF(4);
1292                 READ32(sess->back_channel.rdma_attrs);
1293         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1294                 dprintk("Too many back channel attr bitmaps!\n");
1295                 goto xdr_error;
1296         }
1297
1298         READ_BUF(8);
1299         READ32(sess->callback_prog);
1300
1301         /* callback_sec_params4 */
1302         READ32(nr_secflavs);
1303         for (i = 0; i < nr_secflavs; ++i) {
1304                 READ_BUF(4);
1305                 READ32(dummy);
1306                 switch (dummy) {
1307                 case RPC_AUTH_NULL:
1308                         /* Nothing to read */
1309                         break;
1310                 case RPC_AUTH_UNIX:
1311                         READ_BUF(8);
1312                         /* stamp */
1313                         READ32(dummy);
1314
1315                         /* machine name */
1316                         READ32(dummy);
1317                         READ_BUF(dummy);
1318                         SAVEMEM(machine_name, dummy);
1319
1320                         /* uid, gid */
1321                         READ_BUF(8);
1322                         READ32(sess->uid);
1323                         READ32(sess->gid);
1324
1325                         /* more gids */
1326                         READ_BUF(4);
1327                         READ32(dummy);
1328                         READ_BUF(dummy * 4);
1329                         break;
1330                 case RPC_AUTH_GSS:
1331                         dprintk("RPC_AUTH_GSS callback secflavor "
1332                                 "not supported!\n");
1333                         READ_BUF(8);
1334                         /* gcbp_service */
1335                         READ32(dummy);
1336                         /* gcbp_handle_from_server */
1337                         READ32(dummy);
1338                         READ_BUF(dummy);
1339                         p += XDR_QUADLEN(dummy);
1340                         /* gcbp_handle_from_client */
1341                         READ_BUF(4);
1342                         READ32(dummy);
1343                         READ_BUF(dummy);
1344                         break;
1345                 default:
1346                         dprintk("Illegal callback secflavor\n");
1347                         return nfserr_inval;
1348                 }
1349         }
1350         DECODE_TAIL;
1351 }
1352
1353 static __be32
1354 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1355                              struct nfsd4_destroy_session *destroy_session)
1356 {
1357         DECODE_HEAD;
1358         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1359         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1360
1361         DECODE_TAIL;
1362 }
1363
1364 static __be32
1365 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1366                           struct nfsd4_free_stateid *free_stateid)
1367 {
1368         DECODE_HEAD;
1369
1370         READ_BUF(sizeof(stateid_t));
1371         READ32(free_stateid->fr_stateid.si_generation);
1372         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1373
1374         DECODE_TAIL;
1375 }
1376
1377 static __be32
1378 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1379                       struct nfsd4_sequence *seq)
1380 {
1381         DECODE_HEAD;
1382
1383         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1384         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1385         READ32(seq->seqid);
1386         READ32(seq->slotid);
1387         READ32(seq->maxslots);
1388         READ32(seq->cachethis);
1389
1390         DECODE_TAIL;
1391 }
1392
1393 static __be32
1394 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1395 {
1396         unsigned int nbytes;
1397         stateid_t si;
1398         int i;
1399         __be32 *p;
1400         __be32 status;
1401
1402         READ_BUF(4);
1403         test_stateid->ts_num_ids = ntohl(*p++);
1404
1405         nbytes = test_stateid->ts_num_ids * sizeof(stateid_t);
1406         if (nbytes > (u32)((char *)argp->end - (char *)argp->p))
1407                 goto xdr_error;
1408
1409         test_stateid->ts_saved_args = argp;
1410         save_buf(argp, &test_stateid->ts_savedp);
1411
1412         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1413                 status = nfsd4_decode_stateid(argp, &si);
1414                 if (status)
1415                         return status;
1416         }
1417
1418         status = 0;
1419 out:
1420         return status;
1421 xdr_error:
1422         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1423         status = nfserr_bad_xdr;
1424         goto out;
1425 }
1426
1427 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1428 {
1429         DECODE_HEAD;
1430
1431         READ_BUF(8);
1432         COPYMEM(&dc->clientid, 8);
1433
1434         DECODE_TAIL;
1435 }
1436
1437 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1438 {
1439         DECODE_HEAD;
1440
1441         READ_BUF(4);
1442         READ32(rc->rca_one_fs);
1443
1444         DECODE_TAIL;
1445 }
1446
1447 static __be32
1448 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1449 {
1450         return nfs_ok;
1451 }
1452
1453 static __be32
1454 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1455 {
1456         return nfserr_notsupp;
1457 }
1458
1459 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1460
1461 static nfsd4_dec nfsd4_dec_ops[] = {
1462         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1463         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1464         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1465         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1466         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1467         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1468         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1469         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1470         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1471         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1472         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1473         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1474         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1475         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1476         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1477         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1478         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1479         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1480         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1481         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1482         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1483         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1484         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1485         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1486         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1487         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1488         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1489         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1490         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1491         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1492         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1493         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1494         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1495         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1496         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1497         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1498         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1499 };
1500
1501 static nfsd4_dec nfsd41_dec_ops[] = {
1502         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1503         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1504         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1505         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1506         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1507         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1508         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1509         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1510         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1511         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1512         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1513         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1514         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1515         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1516         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1517         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1518         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1519         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1520         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1521         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1522         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1523         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1524         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1525         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1526         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1527         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1528         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1529         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1530         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1531         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1532         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1533         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1534         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1535         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1536         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1537         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1538         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1539
1540         /* new operations for NFSv4.1 */
1541         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1542         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1543         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1544         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1545         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1546         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1547         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1548         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1549         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1550         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1551         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1552         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1553         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1554         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1555         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1556         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1557         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1558         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1559         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1560 };
1561
1562 struct nfsd4_minorversion_ops {
1563         nfsd4_dec *decoders;
1564         int nops;
1565 };
1566
1567 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1568         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1569         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1570 };
1571
1572 static __be32
1573 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1574 {
1575         DECODE_HEAD;
1576         struct nfsd4_op *op;
1577         struct nfsd4_minorversion_ops *ops;
1578         bool cachethis = false;
1579         int i;
1580
1581         /*
1582          * XXX: According to spec, we should check the tag
1583          * for UTF-8 compliance.  I'm postponing this for
1584          * now because it seems that some clients do use
1585          * binary tags.
1586          */
1587         READ_BUF(4);
1588         READ32(argp->taglen);
1589         READ_BUF(argp->taglen);
1590         SAVEMEM(argp->tag, argp->taglen);
1591         READ_BUF(8);
1592         READ32(argp->minorversion);
1593         READ32(argp->opcnt);
1594
1595         if (argp->taglen > NFSD4_MAX_TAGLEN)
1596                 goto xdr_error;
1597         if (argp->opcnt > 100)
1598                 goto xdr_error;
1599
1600         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1601                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1602                 if (!argp->ops) {
1603                         argp->ops = argp->iops;
1604                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1605                         goto xdr_error;
1606                 }
1607         }
1608
1609         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1610                 argp->opcnt = 0;
1611
1612         ops = &nfsd4_minorversion[argp->minorversion];
1613         for (i = 0; i < argp->opcnt; i++) {
1614                 op = &argp->ops[i];
1615                 op->replay = NULL;
1616
1617                 /*
1618                  * We can't use READ_BUF() here because we need to handle
1619                  * a missing opcode as an OP_WRITE + 1. So we need to check
1620                  * to see if we're truly at the end of our buffer or if there
1621                  * is another page we need to flip to.
1622                  */
1623
1624                 if (argp->p == argp->end) {
1625                         if (argp->pagelen < 4) {
1626                                 /* There isn't an opcode still on the wire */
1627                                 op->opnum = OP_WRITE + 1;
1628                                 op->status = nfserr_bad_xdr;
1629                                 argp->opcnt = i+1;
1630                                 break;
1631                         }
1632
1633                         /*
1634                          * False alarm. We just hit a page boundary, but there
1635                          * is still data available.  Move pointer across page
1636                          * boundary.  *snip from READ_BUF*
1637                          */
1638                         argp->p = page_address(argp->pagelist[0]);
1639                         argp->pagelist++;
1640                         if (argp->pagelen < PAGE_SIZE) {
1641                                 argp->end = argp->p + (argp->pagelen>>2);
1642                                 argp->pagelen = 0;
1643                         } else {
1644                                 argp->end = argp->p + (PAGE_SIZE>>2);
1645                                 argp->pagelen -= PAGE_SIZE;
1646                         }
1647                 }
1648                 op->opnum = ntohl(*argp->p++);
1649
1650                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1651                         op->status = ops->decoders[op->opnum](argp, &op->u);
1652                 else {
1653                         op->opnum = OP_ILLEGAL;
1654                         op->status = nfserr_op_illegal;
1655                 }
1656
1657                 if (op->status) {
1658                         argp->opcnt = i+1;
1659                         break;
1660                 }
1661                 /*
1662                  * We'll try to cache the result in the DRC if any one
1663                  * op in the compound wants to be cached:
1664                  */
1665                 cachethis |= nfsd4_cache_this_op(op);
1666         }
1667         /* Sessions make the DRC unnecessary: */
1668         if (argp->minorversion)
1669                 cachethis = false;
1670         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1671
1672         DECODE_TAIL;
1673 }
1674
1675 #define WRITE32(n)               *p++ = htonl(n)
1676 #define WRITE64(n)               do {                           \
1677         *p++ = htonl((u32)((n) >> 32));                         \
1678         *p++ = htonl((u32)(n));                                 \
1679 } while (0)
1680 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1681         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1682         memcpy(p, ptr, nbytes);                                 \
1683         p += XDR_QUADLEN(nbytes);                               \
1684 }} while (0)
1685
1686 static void write32(__be32 **p, u32 n)
1687 {
1688         *(*p)++ = n;
1689 }
1690
1691 static void write64(__be32 **p, u64 n)
1692 {
1693         write32(p, (u32)(n >> 32));
1694         write32(p, (u32)n);
1695 }
1696
1697 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1698 {
1699         if (IS_I_VERSION(inode)) {
1700                 write64(p, inode->i_version);
1701         } else {
1702                 write32(p, stat->ctime.tv_sec);
1703                 write32(p, stat->ctime.tv_nsec);
1704         }
1705 }
1706
1707 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1708 {
1709         write32(p, c->atomic);
1710         if (c->change_supported) {
1711                 write64(p, c->before_change);
1712                 write64(p, c->after_change);
1713         } else {
1714                 write32(p, c->before_ctime_sec);
1715                 write32(p, c->before_ctime_nsec);
1716                 write32(p, c->after_ctime_sec);
1717                 write32(p, c->after_ctime_nsec);
1718         }
1719 }
1720
1721 #define RESERVE_SPACE(nbytes)   do {                            \
1722         p = resp->p;                                            \
1723         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1724 } while (0)
1725 #define ADJUST_ARGS()           resp->p = p
1726
1727 /*
1728  * Header routine to setup seqid operation replay cache
1729  */
1730 #define ENCODE_SEQID_OP_HEAD                                    \
1731         __be32 *save;                                           \
1732                                                                 \
1733         save = resp->p;
1734
1735 /*
1736  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1737  * is where sequence id's are incremented, and the replay cache is filled.
1738  * Note that we increment sequence id's here, at the last moment, so we're sure
1739  * we know whether the error to be returned is a sequence id mutating error.
1740  */
1741
1742 static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1743 {
1744         struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1745
1746         if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1747                 stateowner->so_seqid++;
1748                 stateowner->so_replay.rp_status = nfserr;
1749                 stateowner->so_replay.rp_buflen =
1750                           (char *)resp->p - (char *)save;
1751                 memcpy(stateowner->so_replay.rp_buf, save,
1752                         stateowner->so_replay.rp_buflen);
1753                 nfsd4_purge_closed_stateid(stateowner);
1754         }
1755 }
1756
1757 /* Encode as an array of strings the string given with components
1758  * separated @sep.
1759  */
1760 static __be32 nfsd4_encode_components(char sep, char *components,
1761                                    __be32 **pp, int *buflen)
1762 {
1763         __be32 *p = *pp;
1764         __be32 *countp = p;
1765         int strlen, count=0;
1766         char *str, *end;
1767
1768         dprintk("nfsd4_encode_components(%s)\n", components);
1769         if ((*buflen -= 4) < 0)
1770                 return nfserr_resource;
1771         WRITE32(0); /* We will fill this in with @count later */
1772         end = str = components;
1773         while (*end) {
1774                 for (; *end && (*end != sep); end++)
1775                         ; /* Point to end of component */
1776                 strlen = end - str;
1777                 if (strlen) {
1778                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1779                                 return nfserr_resource;
1780                         WRITE32(strlen);
1781                         WRITEMEM(str, strlen);
1782                         count++;
1783                 }
1784                 else
1785                         end++;
1786                 str = end;
1787         }
1788         *pp = p;
1789         p = countp;
1790         WRITE32(count);
1791         return 0;
1792 }
1793
1794 /*
1795  * encode a location element of a fs_locations structure
1796  */
1797 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1798                                     __be32 **pp, int *buflen)
1799 {
1800         __be32 status;
1801         __be32 *p = *pp;
1802
1803         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1804         if (status)
1805                 return status;
1806         status = nfsd4_encode_components('/', location->path, &p, buflen);
1807         if (status)
1808                 return status;
1809         *pp = p;
1810         return 0;
1811 }
1812
1813 /*
1814  * Encode a path in RFC3530 'pathname4' format
1815  */
1816 static __be32 nfsd4_encode_path(const struct path *root,
1817                 const struct path *path, __be32 **pp, int *buflen)
1818 {
1819         struct path cur = {
1820                 .mnt = path->mnt,
1821                 .dentry = path->dentry,
1822         };
1823         __be32 *p = *pp;
1824         struct dentry **components = NULL;
1825         unsigned int ncomponents = 0;
1826         __be32 err = nfserr_jukebox;
1827
1828         dprintk("nfsd4_encode_components(");
1829
1830         path_get(&cur);
1831         /* First walk the path up to the nfsd root, and store the
1832          * dentries/path components in an array.
1833          */
1834         for (;;) {
1835                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1836                         break;
1837                 if (cur.dentry == cur.mnt->mnt_root) {
1838                         if (follow_up(&cur))
1839                                 continue;
1840                         goto out_free;
1841                 }
1842                 if ((ncomponents & 15) == 0) {
1843                         struct dentry **new;
1844                         new = krealloc(components,
1845                                         sizeof(*new) * (ncomponents + 16),
1846                                         GFP_KERNEL);
1847                         if (!new)
1848                                 goto out_free;
1849                         components = new;
1850                 }
1851                 components[ncomponents++] = cur.dentry;
1852                 cur.dentry = dget_parent(cur.dentry);
1853         }
1854
1855         *buflen -= 4;
1856         if (*buflen < 0)
1857                 goto out_free;
1858         WRITE32(ncomponents);
1859
1860         while (ncomponents) {
1861                 struct dentry *dentry = components[ncomponents - 1];
1862                 unsigned int len = dentry->d_name.len;
1863
1864                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1865                 if (*buflen < 0)
1866                         goto out_free;
1867                 WRITE32(len);
1868                 WRITEMEM(dentry->d_name.name, len);
1869                 dprintk("/%s", dentry->d_name.name);
1870                 dput(dentry);
1871                 ncomponents--;
1872         }
1873
1874         *pp = p;
1875         err = 0;
1876 out_free:
1877         dprintk(")\n");
1878         while (ncomponents)
1879                 dput(components[--ncomponents]);
1880         kfree(components);
1881         path_put(&cur);
1882         return err;
1883 }
1884
1885 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1886                 const struct path *path, __be32 **pp, int *buflen)
1887 {
1888         struct svc_export *exp_ps;
1889         __be32 res;
1890
1891         exp_ps = rqst_find_fsidzero_export(rqstp);
1892         if (IS_ERR(exp_ps))
1893                 return nfserrno(PTR_ERR(exp_ps));
1894         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1895         exp_put(exp_ps);
1896         return res;
1897 }
1898
1899 /*
1900  *  encode a fs_locations structure
1901  */
1902 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1903                                      struct svc_export *exp,
1904                                      __be32 **pp, int *buflen)
1905 {
1906         __be32 status;
1907         int i;
1908         __be32 *p = *pp;
1909         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1910
1911         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1912         if (status)
1913                 return status;
1914         if ((*buflen -= 4) < 0)
1915                 return nfserr_resource;
1916         WRITE32(fslocs->locations_count);
1917         for (i=0; i<fslocs->locations_count; i++) {
1918                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1919                                                    &p, buflen);
1920                 if (status)
1921                         return status;
1922         }
1923         *pp = p;
1924         return 0;
1925 }
1926
1927 static u32 nfs4_file_type(umode_t mode)
1928 {
1929         switch (mode & S_IFMT) {
1930         case S_IFIFO:   return NF4FIFO;
1931         case S_IFCHR:   return NF4CHR;
1932         case S_IFDIR:   return NF4DIR;
1933         case S_IFBLK:   return NF4BLK;
1934         case S_IFLNK:   return NF4LNK;
1935         case S_IFREG:   return NF4REG;
1936         case S_IFSOCK:  return NF4SOCK;
1937         default:        return NF4BAD;
1938         };
1939 }
1940
1941 static __be32
1942 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1943                         __be32 **p, int *buflen)
1944 {
1945         int status;
1946
1947         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1948                 return nfserr_resource;
1949         if (whotype != NFS4_ACL_WHO_NAMED)
1950                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1951         else if (group)
1952                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1953         else
1954                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1955         if (status < 0)
1956                 return nfserrno(status);
1957         *p = xdr_encode_opaque(*p, NULL, status);
1958         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1959         BUG_ON(*buflen < 0);
1960         return 0;
1961 }
1962
1963 static inline __be32
1964 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1965 {
1966         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1967 }
1968
1969 static inline __be32
1970 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1971 {
1972         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1973 }
1974
1975 static inline __be32
1976 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1977                 __be32 **p, int *buflen)
1978 {
1979         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1980 }
1981
1982 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1983                               FATTR4_WORD0_RDATTR_ERROR)
1984 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1985
1986 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1987 {
1988         /* As per referral draft:  */
1989         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1990             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1991                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1992                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1993                         *rdattr_err = NFSERR_MOVED;
1994                 else
1995                         return nfserr_moved;
1996         }
1997         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1998         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1999         return 0;
2000 }
2001
2002 /*
2003  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2004  * ourselves.
2005  *
2006  * @countp is the buffer size in _words_; upon successful return this becomes
2007  * replaced with the number of words written.
2008  */
2009 __be32
2010 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2011                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
2012                 struct svc_rqst *rqstp, int ignore_crossmnt)
2013 {
2014         u32 bmval0 = bmval[0];
2015         u32 bmval1 = bmval[1];
2016         u32 bmval2 = bmval[2];
2017         struct kstat stat;
2018         struct svc_fh tempfh;
2019         struct kstatfs statfs;
2020         int buflen = *countp << 2;
2021         __be32 *attrlenp;
2022         u32 dummy;
2023         u64 dummy64;
2024         u32 rdattr_err = 0;
2025         __be32 *p = buffer;
2026         __be32 status;
2027         int err;
2028         int aclsupport = 0;
2029         struct nfs4_acl *acl = NULL;
2030         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2031         u32 minorversion = resp->cstate.minorversion;
2032         struct path path = {
2033                 .mnt    = exp->ex_path.mnt,
2034                 .dentry = dentry,
2035         };
2036
2037         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2038         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2039         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2040         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2041
2042         if (exp->ex_fslocs.migrated) {
2043                 BUG_ON(bmval[2]);
2044                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2045                 if (status)
2046                         goto out;
2047         }
2048
2049         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2050         if (err)
2051                 goto out_nfserr;
2052         if ((bmval0 & (FATTR4_WORD0_FILES_AVAIL | FATTR4_WORD0_FILES_FREE |
2053                         FATTR4_WORD0_FILES_TOTAL | FATTR4_WORD0_MAXNAME)) ||
2054             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2055                        FATTR4_WORD1_SPACE_TOTAL))) {
2056                 err = vfs_statfs(&path, &statfs);
2057                 if (err)
2058                         goto out_nfserr;
2059         }
2060         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2061                 fh_init(&tempfh, NFS4_FHSIZE);
2062                 status = fh_compose(&tempfh, exp, dentry, NULL);
2063                 if (status)
2064                         goto out;
2065                 fhp = &tempfh;
2066         }
2067         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2068                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2069                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2070                 aclsupport = (err == 0);
2071                 if (bmval0 & FATTR4_WORD0_ACL) {
2072                         if (err == -EOPNOTSUPP)
2073                                 bmval0 &= ~FATTR4_WORD0_ACL;
2074                         else if (err == -EINVAL) {
2075                                 status = nfserr_attrnotsupp;
2076                                 goto out;
2077                         } else if (err != 0)
2078                                 goto out_nfserr;
2079                 }
2080         }
2081
2082         if (bmval2) {
2083                 if ((buflen -= 16) < 0)
2084                         goto out_resource;
2085                 WRITE32(3);
2086                 WRITE32(bmval0);
2087                 WRITE32(bmval1);
2088                 WRITE32(bmval2);
2089         } else if (bmval1) {
2090                 if ((buflen -= 12) < 0)
2091                         goto out_resource;
2092                 WRITE32(2);
2093                 WRITE32(bmval0);
2094                 WRITE32(bmval1);
2095         } else {
2096                 if ((buflen -= 8) < 0)
2097                         goto out_resource;
2098                 WRITE32(1);
2099                 WRITE32(bmval0);
2100         }
2101         attrlenp = p++;                /* to be backfilled later */
2102
2103         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2104                 u32 word0 = nfsd_suppattrs0(minorversion);
2105                 u32 word1 = nfsd_suppattrs1(minorversion);
2106                 u32 word2 = nfsd_suppattrs2(minorversion);
2107
2108                 if (!aclsupport)
2109                         word0 &= ~FATTR4_WORD0_ACL;
2110                 if (!word2) {
2111                         if ((buflen -= 12) < 0)
2112                                 goto out_resource;
2113                         WRITE32(2);
2114                         WRITE32(word0);
2115                         WRITE32(word1);
2116                 } else {
2117                         if ((buflen -= 16) < 0)
2118                                 goto out_resource;
2119                         WRITE32(3);
2120                         WRITE32(word0);
2121                         WRITE32(word1);
2122                         WRITE32(word2);
2123                 }
2124         }
2125         if (bmval0 & FATTR4_WORD0_TYPE) {
2126                 if ((buflen -= 4) < 0)
2127                         goto out_resource;
2128                 dummy = nfs4_file_type(stat.mode);
2129                 if (dummy == NF4BAD)
2130                         goto out_serverfault;
2131                 WRITE32(dummy);
2132         }
2133         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2134                 if ((buflen -= 4) < 0)
2135                         goto out_resource;
2136                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2137                         WRITE32(NFS4_FH_PERSISTENT);
2138                 else
2139                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2140         }
2141         if (bmval0 & FATTR4_WORD0_CHANGE) {
2142                 if ((buflen -= 8) < 0)
2143                         goto out_resource;
2144                 write_change(&p, &stat, dentry->d_inode);
2145         }
2146         if (bmval0 & FATTR4_WORD0_SIZE) {
2147                 if ((buflen -= 8) < 0)
2148                         goto out_resource;
2149                 WRITE64(stat.size);
2150         }
2151         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2152                 if ((buflen -= 4) < 0)
2153                         goto out_resource;
2154                 WRITE32(1);
2155         }
2156         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2157                 if ((buflen -= 4) < 0)
2158                         goto out_resource;
2159                 WRITE32(1);
2160         }
2161         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2162                 if ((buflen -= 4) < 0)
2163                         goto out_resource;
2164                 WRITE32(0);
2165         }
2166         if (bmval0 & FATTR4_WORD0_FSID) {
2167                 if ((buflen -= 16) < 0)
2168                         goto out_resource;
2169                 if (exp->ex_fslocs.migrated) {
2170                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2171                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2172                 } else switch(fsid_source(fhp)) {
2173                 case FSIDSOURCE_FSID:
2174                         WRITE64((u64)exp->ex_fsid);
2175                         WRITE64((u64)0);
2176                         break;
2177                 case FSIDSOURCE_DEV:
2178                         WRITE32(0);
2179                         WRITE32(MAJOR(stat.dev));
2180                         WRITE32(0);
2181                         WRITE32(MINOR(stat.dev));
2182                         break;
2183                 case FSIDSOURCE_UUID:
2184                         WRITEMEM(exp->ex_uuid, 16);
2185                         break;
2186                 }
2187         }
2188         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2189                 if ((buflen -= 4) < 0)
2190                         goto out_resource;
2191                 WRITE32(0);
2192         }
2193         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2194                 if ((buflen -= 4) < 0)
2195                         goto out_resource;
2196                 WRITE32(nfsd4_lease);
2197         }
2198         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2199                 if ((buflen -= 4) < 0)
2200                         goto out_resource;
2201                 WRITE32(rdattr_err);
2202         }
2203         if (bmval0 & FATTR4_WORD0_ACL) {
2204                 struct nfs4_ace *ace;
2205
2206                 if (acl == NULL) {
2207                         if ((buflen -= 4) < 0)
2208                                 goto out_resource;
2209
2210                         WRITE32(0);
2211                         goto out_acl;
2212                 }
2213                 if ((buflen -= 4) < 0)
2214                         goto out_resource;
2215                 WRITE32(acl->naces);
2216
2217                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2218                         if ((buflen -= 4*3) < 0)
2219                                 goto out_resource;
2220                         WRITE32(ace->type);
2221                         WRITE32(ace->flag);
2222                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2223                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
2224                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2225                                 &p, &buflen);
2226                         if (status == nfserr_resource)
2227                                 goto out_resource;
2228                         if (status)
2229                                 goto out;
2230                 }
2231         }
2232 out_acl:
2233         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2234                 if ((buflen -= 4) < 0)
2235                         goto out_resource;
2236                 WRITE32(aclsupport ?
2237                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2238         }
2239         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2240                 if ((buflen -= 4) < 0)
2241                         goto out_resource;
2242                 WRITE32(1);
2243         }
2244         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2245                 if ((buflen -= 4) < 0)
2246                         goto out_resource;
2247                 WRITE32(0);
2248         }
2249         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2250                 if ((buflen -= 4) < 0)
2251                         goto out_resource;
2252                 WRITE32(1);
2253         }
2254         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2255                 if ((buflen -= 4) < 0)
2256                         goto out_resource;
2257                 WRITE32(1);
2258         }
2259         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2260                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2261                 if (buflen < 0)
2262                         goto out_resource;
2263                 WRITE32(fhp->fh_handle.fh_size);
2264                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2265         }
2266         if (bmval0 & FATTR4_WORD0_FILEID) {
2267                 if ((buflen -= 8) < 0)
2268                         goto out_resource;
2269                 WRITE64(stat.ino);
2270         }
2271         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2272                 if ((buflen -= 8) < 0)
2273                         goto out_resource;
2274                 WRITE64((u64) statfs.f_ffree);
2275         }
2276         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2277                 if ((buflen -= 8) < 0)
2278                         goto out_resource;
2279                 WRITE64((u64) statfs.f_ffree);
2280         }
2281         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2282                 if ((buflen -= 8) < 0)
2283                         goto out_resource;
2284                 WRITE64((u64) statfs.f_files);
2285         }
2286         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2287                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2288                 if (status == nfserr_resource)
2289                         goto out_resource;
2290                 if (status)
2291                         goto out;
2292         }
2293         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2294                 if ((buflen -= 4) < 0)
2295                         goto out_resource;
2296                 WRITE32(1);
2297         }
2298         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2299                 if ((buflen -= 8) < 0)
2300                         goto out_resource;
2301                 WRITE64(~(u64)0);
2302         }
2303         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2304                 if ((buflen -= 4) < 0)
2305                         goto out_resource;
2306                 WRITE32(255);
2307         }
2308         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2309                 if ((buflen -= 4) < 0)
2310                         goto out_resource;
2311                 WRITE32(statfs.f_namelen);
2312         }
2313         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2314                 if ((buflen -= 8) < 0)
2315                         goto out_resource;
2316                 WRITE64((u64) svc_max_payload(rqstp));
2317         }
2318         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2319                 if ((buflen -= 8) < 0)
2320                         goto out_resource;
2321                 WRITE64((u64) svc_max_payload(rqstp));
2322         }
2323         if (bmval1 & FATTR4_WORD1_MODE) {
2324                 if ((buflen -= 4) < 0)
2325                         goto out_resource;
2326                 WRITE32(stat.mode & S_IALLUGO);
2327         }
2328         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2329                 if ((buflen -= 4) < 0)
2330                         goto out_resource;
2331                 WRITE32(1);
2332         }
2333         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2334                 if ((buflen -= 4) < 0)
2335                         goto out_resource;
2336                 WRITE32(stat.nlink);
2337         }
2338         if (bmval1 & FATTR4_WORD1_OWNER) {
2339                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2340                 if (status == nfserr_resource)
2341                         goto out_resource;
2342                 if (status)
2343                         goto out;
2344         }
2345         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2346                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2347                 if (status == nfserr_resource)
2348                         goto out_resource;
2349                 if (status)
2350                         goto out;
2351         }
2352         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2353                 if ((buflen -= 8) < 0)
2354                         goto out_resource;
2355                 WRITE32((u32) MAJOR(stat.rdev));
2356                 WRITE32((u32) MINOR(stat.rdev));
2357         }
2358         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2359                 if ((buflen -= 8) < 0)
2360                         goto out_resource;
2361                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2362                 WRITE64(dummy64);
2363         }
2364         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2365                 if ((buflen -= 8) < 0)
2366                         goto out_resource;
2367                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2368                 WRITE64(dummy64);
2369         }
2370         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2371                 if ((buflen -= 8) < 0)
2372                         goto out_resource;
2373                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2374                 WRITE64(dummy64);
2375         }
2376         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2377                 if ((buflen -= 8) < 0)
2378                         goto out_resource;
2379                 dummy64 = (u64)stat.blocks << 9;
2380                 WRITE64(dummy64);
2381         }
2382         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2383                 if ((buflen -= 12) < 0)
2384                         goto out_resource;
2385                 WRITE64((s64)stat.atime.tv_sec);
2386                 WRITE32(stat.atime.tv_nsec);
2387         }
2388         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2389                 if ((buflen -= 12) < 0)
2390                         goto out_resource;
2391                 WRITE32(0);
2392                 WRITE32(1);
2393                 WRITE32(0);
2394         }
2395         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2396                 if ((buflen -= 12) < 0)
2397                         goto out_resource;
2398                 WRITE64((s64)stat.ctime.tv_sec);
2399                 WRITE32(stat.ctime.tv_nsec);
2400         }
2401         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2402                 if ((buflen -= 12) < 0)
2403                         goto out_resource;
2404                 WRITE64((s64)stat.mtime.tv_sec);
2405                 WRITE32(stat.mtime.tv_nsec);
2406         }
2407         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2408                 if ((buflen -= 8) < 0)
2409                         goto out_resource;
2410                 /*
2411                  * Get parent's attributes if not ignoring crossmount
2412                  * and this is the root of a cross-mounted filesystem.
2413                  */
2414                 if (ignore_crossmnt == 0 &&
2415                     dentry == exp->ex_path.mnt->mnt_root) {
2416                         struct path path = exp->ex_path;
2417                         path_get(&path);
2418                         while (follow_up(&path)) {
2419                                 if (path.dentry != path.mnt->mnt_root)
2420                                         break;
2421                         }
2422                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2423                         path_put(&path);
2424                         if (err)
2425                                 goto out_nfserr;
2426                 }
2427                 WRITE64(stat.ino);
2428         }
2429         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2430                 if ((buflen -= 16) < 0)
2431                         goto out_resource;
2432                 WRITE32(3);
2433                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2434                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2435                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2436         }
2437
2438         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2439         *countp = p - buffer;
2440         status = nfs_ok;
2441
2442 out:
2443         kfree(acl);
2444         if (fhp == &tempfh)
2445                 fh_put(&tempfh);
2446         return status;
2447 out_nfserr:
2448         status = nfserrno(err);
2449         goto out;
2450 out_resource:
2451         *countp = 0;
2452         status = nfserr_resource;
2453         goto out;
2454 out_serverfault:
2455         status = nfserr_serverfault;
2456         goto out;
2457 }
2458
2459 static inline int attributes_need_mount(u32 *bmval)
2460 {
2461         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2462                 return 1;
2463         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2464                 return 1;
2465         return 0;
2466 }
2467
2468 static __be32
2469 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2470                 const char *name, int namlen, __be32 *p, int *buflen)
2471 {
2472         struct svc_export *exp = cd->rd_fhp->fh_export;
2473         struct dentry *dentry;
2474         __be32 nfserr;
2475         int ignore_crossmnt = 0;
2476
2477         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2478         if (IS_ERR(dentry))
2479                 return nfserrno(PTR_ERR(dentry));
2480         if (!dentry->d_inode) {
2481                 /*
2482                  * nfsd_buffered_readdir drops the i_mutex between
2483                  * readdir and calling this callback, leaving a window
2484                  * where this directory entry could have gone away.
2485                  */
2486                 dput(dentry);
2487                 return nfserr_noent;
2488         }
2489
2490         exp_get(exp);
2491         /*
2492          * In the case of a mountpoint, the client may be asking for
2493          * attributes that are only properties of the underlying filesystem
2494          * as opposed to the cross-mounted file system. In such a case,
2495          * we will not follow the cross mount and will fill the attribtutes
2496          * directly from the mountpoint dentry.
2497          */
2498         if (nfsd_mountpoint(dentry, exp)) {
2499                 int err;
2500
2501                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2502                                 && !attributes_need_mount(cd->rd_bmval)) {
2503                         ignore_crossmnt = 1;
2504                         goto out_encode;
2505                 }
2506                 /*
2507                  * Why the heck aren't we just using nfsd_lookup??
2508                  * Different "."/".." handling?  Something else?
2509                  * At least, add a comment here to explain....
2510                  */
2511                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2512                 if (err) {
2513                         nfserr = nfserrno(err);
2514                         goto out_put;
2515                 }
2516                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2517                 if (nfserr)
2518                         goto out_put;
2519
2520         }
2521 out_encode:
2522         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2523                                         cd->rd_rqstp, ignore_crossmnt);
2524 out_put:
2525         dput(dentry);
2526         exp_put(exp);
2527         return nfserr;
2528 }
2529
2530 static __be32 *
2531 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2532 {
2533         __be32 *attrlenp;
2534
2535         if (buflen < 6)
2536                 return NULL;
2537         *p++ = htonl(2);
2538         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2539         *p++ = htonl(0);                         /* bmval1 */
2540
2541         attrlenp = p++;
2542         *p++ = nfserr;       /* no htonl */
2543         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2544         return p;
2545 }
2546
2547 static int
2548 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2549                     loff_t offset, u64 ino, unsigned int d_type)
2550 {
2551         struct readdir_cd *ccd = ccdv;
2552         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2553         int buflen;
2554         __be32 *p = cd->buffer;
2555         __be32 *cookiep;
2556         __be32 nfserr = nfserr_toosmall;
2557
2558         /* In nfsv4, "." and ".." never make it onto the wire.. */
2559         if (name && isdotent(name, namlen)) {
2560                 cd->common.err = nfs_ok;
2561                 return 0;
2562         }
2563
2564         if (cd->offset)
2565                 xdr_encode_hyper(cd->offset, (u64) offset);
2566
2567         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2568         if (buflen < 0)
2569                 goto fail;
2570
2571         *p++ = xdr_one;                             /* mark entry present */
2572         cookiep = p;
2573         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2574         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2575
2576         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2577         switch (nfserr) {
2578         case nfs_ok:
2579                 p += buflen;
2580                 break;
2581         case nfserr_resource:
2582                 nfserr = nfserr_toosmall;
2583                 goto fail;
2584         case nfserr_noent:
2585                 goto skip_entry;
2586         default:
2587                 /*
2588                  * If the client requested the RDATTR_ERROR attribute,
2589                  * we stuff the error code into this attribute
2590                  * and continue.  If this attribute was not requested,
2591                  * then in accordance with the spec, we fail the
2592                  * entire READDIR operation(!)
2593                  */
2594                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2595                         goto fail;
2596                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2597                 if (p == NULL) {
2598                         nfserr = nfserr_toosmall;
2599                         goto fail;
2600                 }
2601         }
2602         cd->buflen -= (p - cd->buffer);
2603         cd->buffer = p;
2604         cd->offset = cookiep;
2605 skip_entry:
2606         cd->common.err = nfs_ok;
2607         return 0;
2608 fail:
2609         cd->common.err = nfserr;
2610         return -EINVAL;
2611 }
2612
2613 static void
2614 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2615 {
2616         __be32 *p;
2617
2618         RESERVE_SPACE(sizeof(stateid_t));
2619         WRITE32(sid->si_generation);
2620         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2621         ADJUST_ARGS();
2622 }
2623
2624 static __be32
2625 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2626 {
2627         __be32 *p;
2628
2629         if (!nfserr) {
2630                 RESERVE_SPACE(8);
2631                 WRITE32(access->ac_supported);
2632                 WRITE32(access->ac_resp_access);
2633                 ADJUST_ARGS();
2634         }
2635         return nfserr;
2636 }
2637
2638 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2639 {
2640         __be32 *p;
2641
2642         if (!nfserr) {
2643                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2644                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2645                 WRITE32(bcts->dir);
2646                 /* XXX: ? */
2647                 WRITE32(0);
2648                 ADJUST_ARGS();
2649         }
2650         return nfserr;
2651 }
2652
2653 static __be32
2654 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2655 {
2656         ENCODE_SEQID_OP_HEAD;
2657
2658         if (!nfserr)
2659                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2660
2661         encode_seqid_op_tail(resp, save, nfserr);
2662         return nfserr;
2663 }
2664
2665
2666 static __be32
2667 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2668 {
2669         __be32 *p;
2670
2671         if (!nfserr) {
2672                 RESERVE_SPACE(8);
2673                 WRITEMEM(commit->co_verf.data, 8);
2674                 ADJUST_ARGS();
2675         }
2676         return nfserr;
2677 }
2678
2679 static __be32
2680 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2681 {
2682         __be32 *p;
2683
2684         if (!nfserr) {
2685                 RESERVE_SPACE(32);
2686                 write_cinfo(&p, &create->cr_cinfo);
2687                 WRITE32(2);
2688                 WRITE32(create->cr_bmval[0]);
2689                 WRITE32(create->cr_bmval[1]);
2690                 ADJUST_ARGS();
2691         }
2692         return nfserr;
2693 }
2694
2695 static __be32
2696 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2697 {
2698         struct svc_fh *fhp = getattr->ga_fhp;
2699         int buflen;
2700
2701         if (nfserr)
2702                 return nfserr;
2703
2704         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2705         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2706                                     resp->p, &buflen, getattr->ga_bmval,
2707                                     resp->rqstp, 0);
2708         if (!nfserr)
2709                 resp->p += buflen;
2710         return nfserr;
2711 }
2712
2713 static __be32
2714 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2715 {
2716         struct svc_fh *fhp = *fhpp;
2717         unsigned int len;
2718         __be32 *p;
2719
2720         if (!nfserr) {
2721                 len = fhp->fh_handle.fh_size;
2722                 RESERVE_SPACE(len + 4);
2723                 WRITE32(len);
2724                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2725                 ADJUST_ARGS();
2726         }
2727         return nfserr;
2728 }
2729
2730 /*
2731 * Including all fields other than the name, a LOCK4denied structure requires
2732 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2733 */
2734 static void
2735 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2736 {
2737         struct xdr_netobj *conf = &ld->ld_owner;
2738         __be32 *p;
2739
2740         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2741         WRITE64(ld->ld_start);
2742         WRITE64(ld->ld_length);
2743         WRITE32(ld->ld_type);
2744         if (conf->len) {
2745                 WRITEMEM(&ld->ld_clientid, 8);
2746                 WRITE32(conf->len);
2747                 WRITEMEM(conf->data, conf->len);
2748                 kfree(conf->data);
2749         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2750                 WRITE64((u64)0); /* clientid */
2751                 WRITE32(0); /* length of owner name */
2752         }
2753         ADJUST_ARGS();
2754 }
2755
2756 static __be32
2757 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2758 {
2759         ENCODE_SEQID_OP_HEAD;
2760
2761         if (!nfserr)
2762                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2763         else if (nfserr == nfserr_denied)
2764                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2765
2766         encode_seqid_op_tail(resp, save, nfserr);
2767         return nfserr;
2768 }
2769
2770 static __be32
2771 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2772 {
2773         if (nfserr == nfserr_denied)
2774                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2775         return nfserr;
2776 }
2777
2778 static __be32
2779 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2780 {
2781         ENCODE_SEQID_OP_HEAD;
2782
2783         if (!nfserr)
2784                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2785
2786         encode_seqid_op_tail(resp, save, nfserr);
2787         return nfserr;
2788 }
2789
2790
2791 static __be32
2792 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2793 {
2794         __be32 *p;
2795
2796         if (!nfserr) {
2797                 RESERVE_SPACE(20);
2798                 write_cinfo(&p, &link->li_cinfo);
2799                 ADJUST_ARGS();
2800         }
2801         return nfserr;
2802 }
2803
2804
2805 static __be32
2806 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2807 {
2808         __be32 *p;
2809         ENCODE_SEQID_OP_HEAD;
2810
2811         if (nfserr)
2812                 goto out;
2813
2814         nfsd4_encode_stateid(resp, &open->op_stateid);
2815         RESERVE_SPACE(40);
2816         write_cinfo(&p, &open->op_cinfo);
2817         WRITE32(open->op_rflags);
2818         WRITE32(2);
2819         WRITE32(open->op_bmval[0]);
2820         WRITE32(open->op_bmval[1]);
2821         WRITE32(open->op_delegate_type);
2822         ADJUST_ARGS();
2823
2824         switch (open->op_delegate_type) {
2825         case NFS4_OPEN_DELEGATE_NONE:
2826                 break;
2827         case NFS4_OPEN_DELEGATE_READ:
2828                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2829                 RESERVE_SPACE(20);
2830                 WRITE32(open->op_recall);
2831
2832                 /*
2833                  * TODO: ACE's in delegations
2834                  */
2835                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2836                 WRITE32(0);
2837                 WRITE32(0);
2838                 WRITE32(0);   /* XXX: is NULL principal ok? */
2839                 ADJUST_ARGS();
2840                 break;
2841         case NFS4_OPEN_DELEGATE_WRITE:
2842                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2843                 RESERVE_SPACE(32);
2844                 WRITE32(0);
2845
2846                 /*
2847                  * TODO: space_limit's in delegations
2848                  */
2849                 WRITE32(NFS4_LIMIT_SIZE);
2850                 WRITE32(~(u32)0);
2851                 WRITE32(~(u32)0);
2852
2853                 /*
2854                  * TODO: ACE's in delegations
2855                  */
2856                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2857                 WRITE32(0);
2858                 WRITE32(0);
2859                 WRITE32(0);   /* XXX: is NULL principal ok? */
2860                 ADJUST_ARGS();
2861                 break;
2862         default:
2863                 BUG();
2864         }
2865         /* XXX save filehandle here */
2866 out:
2867         encode_seqid_op_tail(resp, save, nfserr);
2868         return nfserr;
2869 }
2870
2871 static __be32
2872 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2873 {
2874         ENCODE_SEQID_OP_HEAD;
2875
2876         if (!nfserr)
2877                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2878
2879         encode_seqid_op_tail(resp, save, nfserr);
2880         return nfserr;
2881 }
2882
2883 static __be32
2884 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2885 {
2886         ENCODE_SEQID_OP_HEAD;
2887
2888         if (!nfserr)
2889                 nfsd4_encode_stateid(resp, &od->od_stateid);
2890
2891         encode_seqid_op_tail(resp, save, nfserr);
2892         return nfserr;
2893 }
2894
2895 static __be32
2896 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2897                   struct nfsd4_read *read)
2898 {
2899         u32 eof;
2900         int v, pn;
2901         unsigned long maxcount;
2902         long len;
2903         __be32 *p;
2904
2905         if (nfserr)
2906                 return nfserr;
2907         if (resp->xbuf->page_len)
2908                 return nfserr_resource;
2909
2910         RESERVE_SPACE(8); /* eof flag and byte count */
2911
2912         maxcount = svc_max_payload(resp->rqstp);
2913         if (maxcount > read->rd_length)
2914                 maxcount = read->rd_length;
2915
2916         len = maxcount;
2917         v = 0;
2918         while (len > 0) {
2919                 pn = resp->rqstp->rq_resused;
2920                 if (!resp->rqstp->rq_respages[pn]) { /* ran out of pages */
2921                         maxcount -= len;
2922                         break;
2923                 }
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                 resp->rqstp->rq_resused++;
2929                 v++;
2930                 len -= PAGE_SIZE;
2931         }
2932         read->rd_vlen = v;
2933
2934         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2935                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2936                         &maxcount);
2937
2938         if (nfserr)
2939                 return nfserr;
2940         eof = (read->rd_offset + maxcount >=
2941                read->rd_fhp->fh_dentry->d_inode->i_size);
2942
2943         WRITE32(eof);
2944         WRITE32(maxcount);
2945         ADJUST_ARGS();
2946         resp->xbuf->head[0].iov_len = (char*)p
2947                                         - (char*)resp->xbuf->head[0].iov_base;
2948         resp->xbuf->page_len = maxcount;
2949
2950         /* Use rest of head for padding and remaining ops: */
2951         resp->xbuf->tail[0].iov_base = p;
2952         resp->xbuf->tail[0].iov_len = 0;
2953         if (maxcount&3) {
2954                 RESERVE_SPACE(4);
2955                 WRITE32(0);
2956                 resp->xbuf->tail[0].iov_base += maxcount&3;
2957                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2958                 ADJUST_ARGS();
2959         }
2960         return 0;
2961 }
2962
2963 static __be32
2964 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2965 {
2966         int maxcount;
2967         char *page;
2968         __be32 *p;
2969
2970         if (nfserr)
2971                 return nfserr;
2972         if (resp->xbuf->page_len)
2973                 return nfserr_resource;
2974         if (!resp->rqstp->rq_respages[resp->rqstp->rq_resused])
2975                 return nfserr_resource;
2976
2977         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2978
2979         maxcount = PAGE_SIZE;
2980         RESERVE_SPACE(4);
2981
2982         /*
2983          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2984          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2985          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2986          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2987          */
2988         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2989         if (nfserr == nfserr_isdir)
2990                 return nfserr_inval;
2991         if (nfserr)
2992                 return nfserr;
2993
2994         WRITE32(maxcount);
2995         ADJUST_ARGS();
2996         resp->xbuf->head[0].iov_len = (char*)p
2997                                 - (char*)resp->xbuf->head[0].iov_base;
2998         resp->xbuf->page_len = maxcount;
2999
3000         /* Use rest of head for padding and remaining ops: */
3001         resp->xbuf->tail[0].iov_base = p;
3002         resp->xbuf->tail[0].iov_len = 0;
3003         if (maxcount&3) {
3004                 RESERVE_SPACE(4);
3005                 WRITE32(0);
3006                 resp->xbuf->tail[0].iov_base += maxcount&3;
3007                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3008                 ADJUST_ARGS();
3009         }
3010         return 0;
3011 }
3012
3013 static __be32
3014 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3015 {
3016         int maxcount;
3017         loff_t offset;
3018         __be32 *page, *savep, *tailbase;
3019         __be32 *p;
3020
3021         if (nfserr)
3022                 return nfserr;
3023         if (resp->xbuf->page_len)
3024                 return nfserr_resource;
3025         if (!resp->rqstp->rq_respages[resp->rqstp->rq_resused])
3026                 return nfserr_resource;
3027
3028         RESERVE_SPACE(8);  /* verifier */
3029         savep = p;
3030
3031         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3032         WRITE32(0);
3033         WRITE32(0);
3034         ADJUST_ARGS();
3035         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3036         tailbase = p;
3037
3038         maxcount = PAGE_SIZE;
3039         if (maxcount > readdir->rd_maxcount)
3040                 maxcount = readdir->rd_maxcount;
3041
3042         /*
3043          * Convert from bytes to words, account for the two words already
3044          * written, make sure to leave two words at the end for the next
3045          * pointer and eof field.
3046          */
3047         maxcount = (maxcount >> 2) - 4;
3048         if (maxcount < 0) {
3049                 nfserr =  nfserr_toosmall;
3050                 goto err_no_verf;
3051         }
3052
3053         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3054         readdir->common.err = 0;
3055         readdir->buflen = maxcount;
3056         readdir->buffer = page;
3057         readdir->offset = NULL;
3058
3059         offset = readdir->rd_cookie;
3060         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3061                               &offset,
3062                               &readdir->common, nfsd4_encode_dirent);
3063         if (nfserr == nfs_ok &&
3064             readdir->common.err == nfserr_toosmall &&
3065             readdir->buffer == page)
3066                 nfserr = nfserr_toosmall;
3067         if (nfserr)
3068                 goto err_no_verf;
3069
3070         if (readdir->offset)
3071                 xdr_encode_hyper(readdir->offset, offset);
3072
3073         p = readdir->buffer;
3074         *p++ = 0;       /* no more entries */
3075         *p++ = htonl(readdir->common.err == nfserr_eof);
3076         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
3077                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
3078
3079         /* Use rest of head for padding and remaining ops: */
3080         resp->xbuf->tail[0].iov_base = tailbase;
3081         resp->xbuf->tail[0].iov_len = 0;
3082         resp->p = resp->xbuf->tail[0].iov_base;
3083         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3084
3085         return 0;
3086 err_no_verf:
3087         p = savep;
3088         ADJUST_ARGS();
3089         return nfserr;
3090 }
3091
3092 static __be32
3093 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3094 {
3095         __be32 *p;
3096
3097         if (!nfserr) {
3098                 RESERVE_SPACE(20);
3099                 write_cinfo(&p, &remove->rm_cinfo);
3100                 ADJUST_ARGS();
3101         }
3102         return nfserr;
3103 }
3104
3105 static __be32
3106 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3107 {
3108         __be32 *p;
3109
3110         if (!nfserr) {
3111                 RESERVE_SPACE(40);
3112                 write_cinfo(&p, &rename->rn_sinfo);
3113                 write_cinfo(&p, &rename->rn_tinfo);
3114                 ADJUST_ARGS();
3115         }
3116         return nfserr;
3117 }
3118
3119 static __be32
3120 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3121                          __be32 nfserr,struct svc_export *exp)
3122 {
3123         int i = 0;
3124         u32 nflavs;
3125         struct exp_flavor_info *flavs;
3126         struct exp_flavor_info def_flavs[2];
3127         __be32 *p;
3128
3129         if (nfserr)
3130                 goto out;
3131         if (exp->ex_nflavors) {
3132                 flavs = exp->ex_flavors;
3133                 nflavs = exp->ex_nflavors;
3134         } else { /* Handling of some defaults in absence of real secinfo: */
3135                 flavs = def_flavs;
3136                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3137                         nflavs = 2;
3138                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3139                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3140                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3141                         nflavs = 1;
3142                         flavs[0].pseudoflavor
3143                                         = svcauth_gss_flavor(exp->ex_client);
3144                 } else {
3145                         nflavs = 1;
3146                         flavs[0].pseudoflavor
3147                                         = exp->ex_client->flavour->flavour;
3148                 }
3149         }
3150
3151         RESERVE_SPACE(4);
3152         WRITE32(nflavs);
3153         ADJUST_ARGS();
3154         for (i = 0; i < nflavs; i++) {
3155                 u32 flav = flavs[i].pseudoflavor;
3156                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3157
3158                 if (gm) {
3159                         RESERVE_SPACE(4);
3160                         WRITE32(RPC_AUTH_GSS);
3161                         ADJUST_ARGS();
3162                         RESERVE_SPACE(4 + gm->gm_oid.len);
3163                         WRITE32(gm->gm_oid.len);
3164                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3165                         ADJUST_ARGS();
3166                         RESERVE_SPACE(4);
3167                         WRITE32(0); /* qop */
3168                         ADJUST_ARGS();
3169                         RESERVE_SPACE(4);
3170                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
3171                         ADJUST_ARGS();
3172                         gss_mech_put(gm);
3173                 } else {
3174                         RESERVE_SPACE(4);
3175                         WRITE32(flav);
3176                         ADJUST_ARGS();
3177                 }
3178         }
3179 out:
3180         if (exp)
3181                 exp_put(exp);
3182         return nfserr;
3183 }
3184
3185 static __be32
3186 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3187                      struct nfsd4_secinfo *secinfo)
3188 {
3189         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3190 }
3191
3192 static __be32
3193 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3194                      struct nfsd4_secinfo_no_name *secinfo)
3195 {
3196         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3197 }
3198
3199 /*
3200  * The SETATTR encode routine is special -- it always encodes a bitmap,
3201  * regardless of the error status.
3202  */
3203 static __be32
3204 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3205 {
3206         __be32 *p;
3207
3208         RESERVE_SPACE(12);
3209         if (nfserr) {
3210                 WRITE32(2);
3211                 WRITE32(0);
3212                 WRITE32(0);
3213         }
3214         else {
3215                 WRITE32(2);
3216                 WRITE32(setattr->sa_bmval[0]);
3217                 WRITE32(setattr->sa_bmval[1]);
3218         }
3219         ADJUST_ARGS();
3220         return nfserr;
3221 }
3222
3223 static __be32
3224 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3225 {
3226         __be32 *p;
3227
3228         if (!nfserr) {
3229                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
3230                 WRITEMEM(&scd->se_clientid, 8);
3231                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
3232                 ADJUST_ARGS();
3233         }
3234         else if (nfserr == nfserr_clid_inuse) {
3235                 RESERVE_SPACE(8);
3236                 WRITE32(0);
3237                 WRITE32(0);
3238                 ADJUST_ARGS();
3239         }
3240         return nfserr;
3241 }
3242
3243 static __be32
3244 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3245 {
3246         __be32 *p;
3247
3248         if (!nfserr) {
3249                 RESERVE_SPACE(16);
3250                 WRITE32(write->wr_bytes_written);
3251                 WRITE32(write->wr_how_written);
3252                 WRITEMEM(write->wr_verifier.data, 8);
3253                 ADJUST_ARGS();
3254         }
3255         return nfserr;
3256 }
3257
3258 static __be32
3259 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3260                          struct nfsd4_exchange_id *exid)
3261 {
3262         __be32 *p;
3263         char *major_id;
3264         char *server_scope;
3265         int major_id_sz;
3266         int server_scope_sz;
3267         uint64_t minor_id = 0;
3268
3269         if (nfserr)
3270                 return nfserr;
3271
3272         major_id = utsname()->nodename;
3273         major_id_sz = strlen(major_id);
3274         server_scope = utsname()->nodename;
3275         server_scope_sz = strlen(server_scope);
3276
3277         RESERVE_SPACE(
3278                 8 /* eir_clientid */ +
3279                 4 /* eir_sequenceid */ +
3280                 4 /* eir_flags */ +
3281                 4 /* spr_how (SP4_NONE) */ +
3282                 8 /* so_minor_id */ +
3283                 4 /* so_major_id.len */ +
3284                 (XDR_QUADLEN(major_id_sz) * 4) +
3285                 4 /* eir_server_scope.len */ +
3286                 (XDR_QUADLEN(server_scope_sz) * 4) +
3287                 4 /* eir_server_impl_id.count (0) */);
3288
3289         WRITEMEM(&exid->clientid, 8);
3290         WRITE32(exid->seqid);
3291         WRITE32(exid->flags);
3292
3293         /* state_protect4_r. Currently only support SP4_NONE */
3294         BUG_ON(exid->spa_how != SP4_NONE);
3295         WRITE32(exid->spa_how);
3296
3297         /* The server_owner struct */
3298         WRITE64(minor_id);      /* Minor id */
3299         /* major id */
3300         WRITE32(major_id_sz);
3301         WRITEMEM(major_id, major_id_sz);
3302
3303         /* Server scope */
3304         WRITE32(server_scope_sz);
3305         WRITEMEM(server_scope, server_scope_sz);
3306
3307         /* Implementation id */
3308         WRITE32(0);     /* zero length nfs_impl_id4 array */
3309         ADJUST_ARGS();
3310         return 0;
3311 }
3312
3313 static __be32
3314 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3315                             struct nfsd4_create_session *sess)
3316 {
3317         __be32 *p;
3318
3319         if (nfserr)
3320                 return nfserr;
3321
3322         RESERVE_SPACE(24);
3323         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3324         WRITE32(sess->seqid);
3325         WRITE32(sess->flags);
3326         ADJUST_ARGS();
3327
3328         RESERVE_SPACE(28);
3329         WRITE32(0); /* headerpadsz */
3330         WRITE32(sess->fore_channel.maxreq_sz);
3331         WRITE32(sess->fore_channel.maxresp_sz);
3332         WRITE32(sess->fore_channel.maxresp_cached);
3333         WRITE32(sess->fore_channel.maxops);
3334         WRITE32(sess->fore_channel.maxreqs);
3335         WRITE32(sess->fore_channel.nr_rdma_attrs);
3336         ADJUST_ARGS();
3337
3338         if (sess->fore_channel.nr_rdma_attrs) {
3339                 RESERVE_SPACE(4);
3340                 WRITE32(sess->fore_channel.rdma_attrs);
3341                 ADJUST_ARGS();
3342         }
3343
3344         RESERVE_SPACE(28);
3345         WRITE32(0); /* headerpadsz */
3346         WRITE32(sess->back_channel.maxreq_sz);
3347         WRITE32(sess->back_channel.maxresp_sz);
3348         WRITE32(sess->back_channel.maxresp_cached);
3349         WRITE32(sess->back_channel.maxops);
3350         WRITE32(sess->back_channel.maxreqs);
3351         WRITE32(sess->back_channel.nr_rdma_attrs);
3352         ADJUST_ARGS();
3353
3354         if (sess->back_channel.nr_rdma_attrs) {
3355                 RESERVE_SPACE(4);
3356                 WRITE32(sess->back_channel.rdma_attrs);
3357                 ADJUST_ARGS();
3358         }
3359         return 0;
3360 }
3361
3362 static __be32
3363 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3364                              struct nfsd4_destroy_session *destroy_session)
3365 {
3366         return nfserr;
3367 }
3368
3369 static __be32
3370 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, int nfserr,
3371                           struct nfsd4_free_stateid *free_stateid)
3372 {
3373         __be32 *p;
3374
3375         if (nfserr)
3376                 return nfserr;
3377
3378         RESERVE_SPACE(4);
3379         WRITE32(nfserr);
3380         ADJUST_ARGS();
3381         return nfserr;
3382 }
3383
3384 static __be32
3385 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3386                       struct nfsd4_sequence *seq)
3387 {
3388         __be32 *p;
3389
3390         if (nfserr)
3391                 return nfserr;
3392
3393         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3394         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3395         WRITE32(seq->seqid);
3396         WRITE32(seq->slotid);
3397         /* Note slotid's are numbered from zero: */
3398         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3399         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3400         WRITE32(seq->status_flags);
3401
3402         ADJUST_ARGS();
3403         resp->cstate.datap = p; /* DRC cache data pointer */
3404         return 0;
3405 }
3406
3407 __be32
3408 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, int nfserr,
3409                           struct nfsd4_test_stateid *test_stateid)
3410 {
3411         struct nfsd4_compoundargs *argp;
3412         struct nfs4_client *cl = resp->cstate.session->se_client;
3413         stateid_t si;
3414         __be32 *p;
3415         int i;
3416         int valid;
3417
3418         restore_buf(test_stateid->ts_saved_args, &test_stateid->ts_savedp);
3419         argp = test_stateid->ts_saved_args;
3420
3421         RESERVE_SPACE(4);
3422         *p++ = htonl(test_stateid->ts_num_ids);
3423         resp->p = p;
3424
3425         nfs4_lock_state();
3426         for (i = 0; i < test_stateid->ts_num_ids; i++) {
3427                 nfsd4_decode_stateid(argp, &si);
3428                 valid = nfs4_validate_stateid(cl, &si);
3429                 RESERVE_SPACE(4);
3430                 *p++ = valid;
3431                 resp->p = p;
3432         }
3433         nfs4_unlock_state();
3434
3435         return nfserr;
3436 }
3437
3438 static __be32
3439 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3440 {
3441         return nfserr;
3442 }
3443
3444 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3445
3446 /*
3447  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3448  * since we don't need to filter out obsolete ops as this is
3449  * done in the decoding phase.
3450  */
3451 static nfsd4_enc nfsd4_enc_ops[] = {
3452         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3453         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3454         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3455         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3456         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3457         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3458         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3459         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3460         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3461         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3462         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3463         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3464         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3465         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3466         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3467         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3468         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3469         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3470         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3471         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3472         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3473         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3474         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3475         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3476         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3477         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3478         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3479         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3480         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3481         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3482         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3483         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3484         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3485         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3486         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3487         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3488         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3489
3490         /* NFSv4.1 operations */
3491         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3492         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3493         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3494         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3495         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3496         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3497         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3498         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3499         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3500         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3501         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3502         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3503         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3504         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3505         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3506         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3507         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3508         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3509         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3510 };
3511
3512 /*
3513  * Calculate the total amount of memory that the compound response has taken
3514  * after encoding the current operation with pad.
3515  *
3516  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3517  *      which was specified at nfsd4_operation, else pad is zero.
3518  *
3519  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3520  *
3521  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3522  * will be at least a page and will therefore hold the xdr_buf head.
3523  */
3524 int nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3525 {
3526         struct xdr_buf *xb = &resp->rqstp->rq_res;
3527         struct nfsd4_session *session = NULL;
3528         struct nfsd4_slot *slot = resp->cstate.slot;
3529         u32 length, tlen = 0;
3530
3531         if (!nfsd4_has_session(&resp->cstate))
3532                 return 0;
3533
3534         session = resp->cstate.session;
3535         if (session == NULL)
3536                 return 0;
3537
3538         if (xb->page_len == 0) {
3539                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3540         } else {
3541                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3542                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3543
3544                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3545         }
3546         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3547                 length, xb->page_len, tlen, pad);
3548
3549         if (length > session->se_fchannel.maxresp_sz)
3550                 return nfserr_rep_too_big;
3551
3552         if (slot->sl_cachethis == 1 &&
3553             length > session->se_fchannel.maxresp_cached)
3554                 return nfserr_rep_too_big_to_cache;
3555
3556         return 0;
3557 }
3558
3559 void
3560 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3561 {
3562         __be32 *statp;
3563         __be32 *p;
3564
3565         RESERVE_SPACE(8);
3566         WRITE32(op->opnum);
3567         statp = p++;    /* to be backfilled at the end */
3568         ADJUST_ARGS();
3569
3570         if (op->opnum == OP_ILLEGAL)
3571                 goto status;
3572         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3573                !nfsd4_enc_ops[op->opnum]);
3574         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3575         /* nfsd4_check_drc_limit guarantees enough room for error status */
3576         if (!op->status)
3577                 op->status = nfsd4_check_resp_size(resp, 0);
3578 status:
3579         /*
3580          * Note: We write the status directly, instead of using WRITE32(),
3581          * since it is already in network byte order.
3582          */
3583         *statp = op->status;
3584 }
3585
3586 /*
3587  * Encode the reply stored in the stateowner reply cache
3588  *
3589  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3590  * previously sent already encoded operation.
3591  *
3592  * called with nfs4_lock_state() held
3593  */
3594 void
3595 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3596 {
3597         __be32 *p;
3598         struct nfs4_replay *rp = op->replay;
3599
3600         BUG_ON(!rp);
3601
3602         RESERVE_SPACE(8);
3603         WRITE32(op->opnum);
3604         *p++ = rp->rp_status;  /* already xdr'ed */
3605         ADJUST_ARGS();
3606
3607         RESERVE_SPACE(rp->rp_buflen);
3608         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3609         ADJUST_ARGS();
3610 }
3611
3612 int
3613 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3614 {
3615         return xdr_ressize_check(rqstp, p);
3616 }
3617
3618 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3619 {
3620         struct svc_rqst *rqstp = rq;
3621         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3622
3623         if (args->ops != args->iops) {
3624                 kfree(args->ops);
3625                 args->ops = args->iops;
3626         }
3627         kfree(args->tmpp);
3628         args->tmpp = NULL;
3629         while (args->to_free) {
3630                 struct tmpbuf *tb = args->to_free;
3631                 args->to_free = tb->next;
3632                 tb->release(tb->buf);
3633                 kfree(tb);
3634         }
3635         return 1;
3636 }
3637
3638 int
3639 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3640 {
3641         args->p = p;
3642         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3643         args->pagelist = rqstp->rq_arg.pages;
3644         args->pagelen = rqstp->rq_arg.page_len;
3645         args->tmpp = NULL;
3646         args->to_free = NULL;
3647         args->ops = args->iops;
3648         args->rqstp = rqstp;
3649
3650         return !nfsd4_decode_compound(args);
3651 }
3652
3653 int
3654 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3655 {
3656         /*
3657          * All that remains is to write the tag and operation count...
3658          */
3659         struct nfsd4_compound_state *cs = &resp->cstate;
3660         struct kvec *iov;
3661         p = resp->tagp;
3662         *p++ = htonl(resp->taglen);
3663         memcpy(p, resp->tag, resp->taglen);
3664         p += XDR_QUADLEN(resp->taglen);
3665         *p++ = htonl(resp->opcnt);
3666
3667         if (rqstp->rq_res.page_len)
3668                 iov = &rqstp->rq_res.tail[0];
3669         else
3670                 iov = &rqstp->rq_res.head[0];
3671         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3672         BUG_ON(iov->iov_len > PAGE_SIZE);
3673         if (nfsd4_has_session(cs)) {
3674                 if (cs->status != nfserr_replay_cache) {
3675                         nfsd4_store_cache_entry(resp);
3676                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3677                         cs->slot->sl_inuse = false;
3678                 }
3679                 /* Renew the clientid on success and on replay */
3680                 release_session_client(cs->session);
3681                 nfsd4_put_session(cs->session);
3682         }
3683         return 1;
3684 }
3685
3686 /*
3687  * Local variables:
3688  *  c-basic-offset: 8
3689  * End:
3690  */