Pileus Git - ~andy/linux/blob - 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 = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
 219                 if (!p)
 220                         return NULL;
 221         } else {
 222                 BUG_ON(p != argp->tmpp);
 223                 argp->tmpp = NULL;
 224         }
 225         if (defer_free(argp, kfree, p)) {
 226                 kfree(p);
 227                 return NULL;
 228         } else
 229                 return (char *)p;
 230 }
 231
 232 static __be32
 233 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 234 {
 235         u32 bmlen;
 236         DECODE_HEAD;
 237
 238         bmval[0] = 0;
 239         bmval[1] = 0;
 240         bmval[2] = 0;
 241
 242         READ_BUF(4);
 243         READ32(bmlen);
 244         if (bmlen > 1000)
 245                 goto xdr_error;
 246
 247         READ_BUF(bmlen << 2);
 248         if (bmlen > 0)
 249                 READ32(bmval[0]);
 250         if (bmlen > 1)
 251                 READ32(bmval[1]);
 252         if (bmlen > 2)
 253                 READ32(bmval[2]);
 254
 255         DECODE_TAIL;
 256 }
 257
 258 static __be32
 259 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 260                    struct iattr *iattr, struct nfs4_acl **acl)
 261 {
 262         int expected_len, len = 0;
 263         u32 dummy32;
 264         char *buf;
 265         int host_err;
 266
 267         DECODE_HEAD;
 268         iattr->ia_valid = 0;
 269         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 270                 return status;
 271
 272         READ_BUF(4);
 273         READ32(expected_len);
 274
 275         if (bmval[0] & FATTR4_WORD0_SIZE) {
 276                 READ_BUF(8);
 277                 len += 8;
 278                 READ64(iattr->ia_size);
 279                 iattr->ia_valid |= ATTR_SIZE;
 280         }
 281         if (bmval[0] & FATTR4_WORD0_ACL) {
 282                 int nace;
 283                 struct nfs4_ace *ace;
 284
 285                 READ_BUF(4); len += 4;
 286                 READ32(nace);
 287
 288                 if (nace > NFS4_ACL_MAX)
 289                         return nfserr_resource;
 290
 291                 *acl = nfs4_acl_new(nace);
 292                 if (*acl == NULL) {
 293                         host_err = -ENOMEM;
 294                         goto out_nfserr;
 295                 }
 296                 defer_free(argp, kfree, *acl);
 297
 298                 (*acl)->naces = nace;
 299                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 300                         READ_BUF(16); len += 16;
 301                         READ32(ace->type);
 302                         READ32(ace->flag);
 303                         READ32(ace->access_mask);
 304                         READ32(dummy32);
 305                         READ_BUF(dummy32);
 306                         len += XDR_QUADLEN(dummy32) << 2;
 307                         READMEM(buf, dummy32);
 308                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 309                         status = nfs_ok;
 310                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 311                                 ace->who = 0;
 312                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 313                                 status = nfsd_map_name_to_gid(argp->rqstp,
 314                                                 buf, dummy32, &ace->who);
 315                         else
 316                                 status = nfsd_map_name_to_uid(argp->rqstp,
 317                                                 buf, dummy32, &ace->who);
 318                         if (status)
 319                                 return status;
 320                 }
 321         } else
 322                 *acl = NULL;
 323         if (bmval[1] & FATTR4_WORD1_MODE) {
 324                 READ_BUF(4);
 325                 len += 4;
 326                 READ32(iattr->ia_mode);
 327                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 328                 iattr->ia_valid |= ATTR_MODE;
 329         }
 330         if (bmval[1] & FATTR4_WORD1_OWNER) {
 331                 READ_BUF(4);
 332                 len += 4;
 333                 READ32(dummy32);
 334                 READ_BUF(dummy32);
 335                 len += (XDR_QUADLEN(dummy32) << 2);
 336                 READMEM(buf, dummy32);
 337                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 338                         return status;
 339                 iattr->ia_valid |= ATTR_UID;
 340         }
 341         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 342                 READ_BUF(4);
 343                 len += 4;
 344                 READ32(dummy32);
 345                 READ_BUF(dummy32);
 346                 len += (XDR_QUADLEN(dummy32) << 2);
 347                 READMEM(buf, dummy32);
 348                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 349                         return status;
 350                 iattr->ia_valid |= ATTR_GID;
 351         }
 352         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 353                 READ_BUF(4);
 354                 len += 4;
 355                 READ32(dummy32);
 356                 switch (dummy32) {
 357                 case NFS4_SET_TO_CLIENT_TIME:
 358                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 359                            all 32 bits of 'nseconds'. */
 360                         READ_BUF(12);
 361                         len += 12;
 362                         READ32(dummy32);
 363                         if (dummy32)
 364                                 return nfserr_inval;
 365                         READ32(iattr->ia_atime.tv_sec);
 366                         READ32(iattr->ia_atime.tv_nsec);
 367                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 368                                 return nfserr_inval;
 369                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 370                         break;
 371                 case NFS4_SET_TO_SERVER_TIME:
 372                         iattr->ia_valid |= ATTR_ATIME;
 373                         break;
 374                 default:
 375                         goto xdr_error;
 376                 }
 377         }
 378         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 379                 READ_BUF(4);
 380                 len += 4;
 381                 READ32(dummy32);
 382                 switch (dummy32) {
 383                 case NFS4_SET_TO_CLIENT_TIME:
 384                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 385                            all 32 bits of 'nseconds'. */
 386                         READ_BUF(12);
 387                         len += 12;
 388                         READ32(dummy32);
 389                         if (dummy32)
 390                                 return nfserr_inval;
 391                         READ32(iattr->ia_mtime.tv_sec);
 392                         READ32(iattr->ia_mtime.tv_nsec);
 393                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 394                                 return nfserr_inval;
 395                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 396                         break;
 397                 case NFS4_SET_TO_SERVER_TIME:
 398                         iattr->ia_valid |= ATTR_MTIME;
 399                         break;
 400                 default:
 401                         goto xdr_error;
 402                 }
 403         }
 404         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 405             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 406             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 407                 READ_BUF(expected_len - len);
 408         else if (len != expected_len)
 409                 goto xdr_error;
 410
 411         DECODE_TAIL;
 412
 413 out_nfserr:
 414         status = nfserrno(host_err);
 415         goto out;
 416 }
 417
 418 static __be32
 419 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 420 {
 421         DECODE_HEAD;
 422
 423         READ_BUF(sizeof(stateid_t));
 424         READ32(sid->si_generation);
 425         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 426
 427         DECODE_TAIL;
 428 }
 429
 430 static __be32
 431 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 432 {
 433         DECODE_HEAD;
 434
 435         READ_BUF(4);
 436         READ32(access->ac_req_access);
 437
 438         DECODE_TAIL;
 439 }
 440
 441 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 442 {
 443         DECODE_HEAD;
 444
 445         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 446         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 447         READ32(bcts->dir);
 448         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 449          * could help us figure out we should be using it. */
 450         DECODE_TAIL;
 451 }
 452
 453 static __be32
 454 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 455 {
 456         DECODE_HEAD;
 457
 458         READ_BUF(4);
 459         READ32(close->cl_seqid);
 460         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 461
 462         DECODE_TAIL;
 463 }
 464
 465
 466 static __be32
 467 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 468 {
 469         DECODE_HEAD;
 470
 471         READ_BUF(12);
 472         READ64(commit->co_offset);
 473         READ32(commit->co_count);
 474
 475         DECODE_TAIL;
 476 }
 477
 478 static __be32
 479 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 480 {
 481         DECODE_HEAD;
 482
 483         READ_BUF(4);
 484         READ32(create->cr_type);
 485         switch (create->cr_type) {
 486         case NF4LNK:
 487                 READ_BUF(4);
 488                 READ32(create->cr_linklen);
 489                 READ_BUF(create->cr_linklen);
 490                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 491                 break;
 492         case NF4BLK:
 493         case NF4CHR:
 494                 READ_BUF(8);
 495                 READ32(create->cr_specdata1);
 496                 READ32(create->cr_specdata2);
 497                 break;
 498         case NF4SOCK:
 499         case NF4FIFO:
 500         case NF4DIR:
 501         default:
 502                 break;
 503         }
 504
 505         READ_BUF(4);
 506         READ32(create->cr_namelen);
 507         READ_BUF(create->cr_namelen);
 508         SAVEMEM(create->cr_name, create->cr_namelen);
 509         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 510                 return status;
 511
 512         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 513                                     &create->cr_acl);
 514         if (status)
 515                 goto out;
 516
 517         DECODE_TAIL;
 518 }
 519
 520 static inline __be32
 521 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 522 {
 523         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 524 }
 525
 526 static inline __be32
 527 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 528 {
 529         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 530 }
 531
 532 static __be32
 533 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 534 {
 535         DECODE_HEAD;
 536
 537         READ_BUF(4);
 538         READ32(link->li_namelen);
 539         READ_BUF(link->li_namelen);
 540         SAVEMEM(link->li_name, link->li_namelen);
 541         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 542                 return status;
 543
 544         DECODE_TAIL;
 545 }
 546
 547 static __be32
 548 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 549 {
 550         DECODE_HEAD;
 551
 552         /*
 553         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 554         */
 555         READ_BUF(28);
 556         READ32(lock->lk_type);
 557         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 558                 goto xdr_error;
 559         READ32(lock->lk_reclaim);
 560         READ64(lock->lk_offset);
 561         READ64(lock->lk_length);
 562         READ32(lock->lk_is_new);
 563
 564         if (lock->lk_is_new) {
 565                 READ_BUF(4);
 566                 READ32(lock->lk_new_open_seqid);
 567                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 568                 if (status)
 569                         return status;
 570                 READ_BUF(8 + sizeof(clientid_t));
 571                 READ32(lock->lk_new_lock_seqid);
 572                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 573                 READ32(lock->lk_new_owner.len);
 574                 READ_BUF(lock->lk_new_owner.len);
 575                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 576         } else {
 577                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 578                 if (status)
 579                         return status;
 580                 READ_BUF(4);
 581                 READ32(lock->lk_old_lock_seqid);
 582         }
 583
 584         DECODE_TAIL;
 585 }
 586
 587 static __be32
 588 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 589 {
 590         DECODE_HEAD;
 591
 592         READ_BUF(32);
 593         READ32(lockt->lt_type);
 594         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 595                 goto xdr_error;
 596         READ64(lockt->lt_offset);
 597         READ64(lockt->lt_length);
 598         COPYMEM(&lockt->lt_clientid, 8);
 599         READ32(lockt->lt_owner.len);
 600         READ_BUF(lockt->lt_owner.len);
 601         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 602
 603         DECODE_TAIL;
 604 }
 605
 606 static __be32
 607 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 608 {
 609         DECODE_HEAD;
 610
 611         READ_BUF(8);
 612         READ32(locku->lu_type);
 613         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 614                 goto xdr_error;
 615         READ32(locku->lu_seqid);
 616         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 617         if (status)
 618                 return status;
 619         READ_BUF(16);
 620         READ64(locku->lu_offset);
 621         READ64(locku->lu_length);
 622
 623         DECODE_TAIL;
 624 }
 625
 626 static __be32
 627 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 628 {
 629         DECODE_HEAD;
 630
 631         READ_BUF(4);
 632         READ32(lookup->lo_len);
 633         READ_BUF(lookup->lo_len);
 634         SAVEMEM(lookup->lo_name, lookup->lo_len);
 635         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 636                 return status;
 637
 638         DECODE_TAIL;
 639 }
 640
 641 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *x)
 642 {
 643         __be32 *p;
 644         u32 w;
 645
 646         READ_BUF(4);
 647         READ32(w);
 648         *x = w;
 649         switch (w & NFS4_SHARE_ACCESS_MASK) {
 650         case NFS4_SHARE_ACCESS_READ:
 651         case NFS4_SHARE_ACCESS_WRITE:
 652         case NFS4_SHARE_ACCESS_BOTH:
 653                 break;
 654         default:
 655                 return nfserr_bad_xdr;
 656         }
 657         w &= ~NFS4_SHARE_ACCESS_MASK;
 658         if (!w)
 659                 return nfs_ok;
 660         if (!argp->minorversion)
 661                 return nfserr_bad_xdr;
 662         switch (w & NFS4_SHARE_WANT_MASK) {
 663         case NFS4_SHARE_WANT_NO_PREFERENCE:
 664         case NFS4_SHARE_WANT_READ_DELEG:
 665         case NFS4_SHARE_WANT_WRITE_DELEG:
 666         case NFS4_SHARE_WANT_ANY_DELEG:
 667         case NFS4_SHARE_WANT_NO_DELEG:
 668         case NFS4_SHARE_WANT_CANCEL:
 669                 break;
 670         default:
 671                 return nfserr_bad_xdr;
 672         }
 673         w &= ~NFS4_SHARE_WANT_MASK;
 674         if (!w)
 675                 return nfs_ok;
 676         switch (w) {
 677         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 678         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 679         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 680               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 681                 return nfs_ok;
 682         }
 683 xdr_error:
 684         return nfserr_bad_xdr;
 685 }
 686
 687 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 688 {
 689         __be32 *p;
 690
 691         READ_BUF(4);
 692         READ32(*x);
 693         /* Note: unlinke access bits, deny bits may be zero. */
 694         if (*x & ~NFS4_SHARE_DENY_BOTH)
 695                 return nfserr_bad_xdr;
 696         return nfs_ok;
 697 xdr_error:
 698         return nfserr_bad_xdr;
 699 }
 700
 701 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 702 {
 703         __be32 *p;
 704
 705         READ_BUF(4);
 706         READ32(o->len);
 707
 708         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 709                 return nfserr_bad_xdr;
 710
 711         READ_BUF(o->len);
 712         SAVEMEM(o->data, o->len);
 713         return nfs_ok;
 714 xdr_error:
 715         return nfserr_bad_xdr;
 716 }
 717
 718 static __be32
 719 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 720 {
 721         DECODE_HEAD;
 722
 723         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 724         open->op_iattr.ia_valid = 0;
 725         open->op_openowner = NULL;
 726
 727         /* seqid, share_access, share_deny, clientid, ownerlen */
 728         READ_BUF(4);
 729         READ32(open->op_seqid);
 730         status = nfsd4_decode_share_access(argp, &open->op_share_access);
 731         if (status)
 732                 goto xdr_error;
 733         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 734         if (status)
 735                 goto xdr_error;
 736         READ_BUF(sizeof(clientid_t));
 737         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 738         status = nfsd4_decode_opaque(argp, &open->op_owner);
 739         if (status)
 740                 goto xdr_error;
 741         READ_BUF(4);
 742         READ32(open->op_create);
 743         switch (open->op_create) {
 744         case NFS4_OPEN_NOCREATE:
 745                 break;
 746         case NFS4_OPEN_CREATE:
 747                 READ_BUF(4);
 748                 READ32(open->op_createmode);
 749                 switch (open->op_createmode) {
 750                 case NFS4_CREATE_UNCHECKED:
 751                 case NFS4_CREATE_GUARDED:
 752                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 753                                 &open->op_iattr, &open->op_acl);
 754                         if (status)
 755                                 goto out;
 756                         break;
 757                 case NFS4_CREATE_EXCLUSIVE:
 758                         READ_BUF(8);
 759                         COPYMEM(open->op_verf.data, 8);
 760                         break;
 761                 case NFS4_CREATE_EXCLUSIVE4_1:
 762                         if (argp->minorversion < 1)
 763                                 goto xdr_error;
 764                         READ_BUF(8);
 765                         COPYMEM(open->op_verf.data, 8);
 766                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 767                                 &open->op_iattr, &open->op_acl);
 768                         if (status)
 769                                 goto out;
 770                         break;
 771                 default:
 772                         goto xdr_error;
 773                 }
 774                 break;
 775         default:
 776                 goto xdr_error;
 777         }
 778
 779         /* open_claim */
 780         READ_BUF(4);
 781         READ32(open->op_claim_type);
 782         switch (open->op_claim_type) {
 783         case NFS4_OPEN_CLAIM_NULL:
 784         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 785                 READ_BUF(4);
 786                 READ32(open->op_fname.len);
 787                 READ_BUF(open->op_fname.len);
 788                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 789                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 790                         return status;
 791                 break;
 792         case NFS4_OPEN_CLAIM_PREVIOUS:
 793                 READ_BUF(4);
 794                 READ32(open->op_delegate_type);
 795                 break;
 796         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 797                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 798                 if (status)
 799                         return status;
 800                 READ_BUF(4);
 801                 READ32(open->op_fname.len);
 802                 READ_BUF(open->op_fname.len);
 803                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 804                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 805                         return status;
 806                 break;
 807         case NFS4_OPEN_CLAIM_FH:
 808         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 809                 if (argp->minorversion < 1)
 810                         goto xdr_error;
 811                 /* void */
 812                 break;
 813         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 814                 if (argp->minorversion < 1)
 815                         goto xdr_error;
 816                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 817                 if (status)
 818                         return status;
 819                 break;
 820         default:
 821                 goto xdr_error;
 822         }
 823
 824         DECODE_TAIL;
 825 }
 826
 827 static __be32
 828 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 829 {
 830         DECODE_HEAD;
 831
 832         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 833         if (status)
 834                 return status;
 835         READ_BUF(4);
 836         READ32(open_conf->oc_seqid);
 837
 838         DECODE_TAIL;
 839 }
 840
 841 static __be32
 842 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 843 {
 844         DECODE_HEAD;
 845
 846         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 847         if (status)
 848                 return status;
 849         READ_BUF(4);
 850         READ32(open_down->od_seqid);
 851         status = nfsd4_decode_share_access(argp, &open_down->od_share_access);
 852         if (status)
 853                 return status;
 854         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 855         if (status)
 856                 return status;
 857         DECODE_TAIL;
 858 }
 859
 860 static __be32
 861 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 862 {
 863         DECODE_HEAD;
 864
 865         READ_BUF(4);
 866         READ32(putfh->pf_fhlen);
 867         if (putfh->pf_fhlen > NFS4_FHSIZE)
 868                 goto xdr_error;
 869         READ_BUF(putfh->pf_fhlen);
 870         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 871
 872         DECODE_TAIL;
 873 }
 874
 875 static __be32
 876 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 877 {
 878         DECODE_HEAD;
 879
 880         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 881         if (status)
 882                 return status;
 883         READ_BUF(12);
 884         READ64(read->rd_offset);
 885         READ32(read->rd_length);
 886
 887         DECODE_TAIL;
 888 }
 889
 890 static __be32
 891 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 892 {
 893         DECODE_HEAD;
 894
 895         READ_BUF(24);
 896         READ64(readdir->rd_cookie);
 897         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 898         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 899         READ32(readdir->rd_maxcount);
 900         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 901                 goto out;
 902
 903         DECODE_TAIL;
 904 }
 905
 906 static __be32
 907 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 908 {
 909         DECODE_HEAD;
 910
 911         READ_BUF(4);
 912         READ32(remove->rm_namelen);
 913         READ_BUF(remove->rm_namelen);
 914         SAVEMEM(remove->rm_name, remove->rm_namelen);
 915         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 916                 return status;
 917
 918         DECODE_TAIL;
 919 }
 920
 921 static __be32
 922 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 923 {
 924         DECODE_HEAD;
 925
 926         READ_BUF(4);
 927         READ32(rename->rn_snamelen);
 928         READ_BUF(rename->rn_snamelen + 4);
 929         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 930         READ32(rename->rn_tnamelen);
 931         READ_BUF(rename->rn_tnamelen);
 932         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 933         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 934                 return status;
 935         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 936                 return status;
 937
 938         DECODE_TAIL;
 939 }
 940
 941 static __be32
 942 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 943 {
 944         DECODE_HEAD;
 945
 946         READ_BUF(sizeof(clientid_t));
 947         COPYMEM(clientid, sizeof(clientid_t));
 948
 949         DECODE_TAIL;
 950 }
 951
 952 static __be32
 953 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 954                      struct nfsd4_secinfo *secinfo)
 955 {
 956         DECODE_HEAD;
 957
 958         READ_BUF(4);
 959         READ32(secinfo->si_namelen);
 960         READ_BUF(secinfo->si_namelen);
 961         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 962         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 963                                                                 nfserr_noent);
 964         if (status)
 965                 return status;
 966         DECODE_TAIL;
 967 }
 968
 969 static __be32
 970 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
 971                      struct nfsd4_secinfo_no_name *sin)
 972 {
 973         DECODE_HEAD;
 974
 975         READ_BUF(4);
 976         READ32(sin->sin_style);
 977         DECODE_TAIL;
 978 }
 979
 980 static __be32
 981 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 982 {
 983         __be32 status;
 984
 985         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 986         if (status)
 987                 return status;
 988         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 989                                   &setattr->sa_acl);
 990 }
 991
 992 static __be32
 993 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 994 {
 995         DECODE_HEAD;
 996
 997         READ_BUF(8);
 998         COPYMEM(setclientid->se_verf.data, 8);
 999
1000         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1001         if (status)
1002                 return nfserr_bad_xdr;
1003         READ_BUF(8);
1004         READ32(setclientid->se_callback_prog);
1005         READ32(setclientid->se_callback_netid_len);
1006
1007         READ_BUF(setclientid->se_callback_netid_len + 4);
1008         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1009         READ32(setclientid->se_callback_addr_len);
1010
1011         READ_BUF(setclientid->se_callback_addr_len + 4);
1012         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1013         READ32(setclientid->se_callback_ident);
1014
1015         DECODE_TAIL;
1016 }
1017
1018 static __be32
1019 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1020 {
1021         DECODE_HEAD;
1022
1023         READ_BUF(8 + sizeof(nfs4_verifier));
1024         COPYMEM(&scd_c->sc_clientid, 8);
1025         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
1026
1027         DECODE_TAIL;
1028 }
1029
1030 /* Also used for NVERIFY */
1031 static __be32
1032 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1033 {
1034 #if 0
1035         struct nfsd4_compoundargs save = {
1036                 .p = argp->p,
1037                 .end = argp->end,
1038                 .rqstp = argp->rqstp,
1039         };
1040         u32             ve_bmval[2];
1041         struct iattr    ve_iattr;           /* request */
1042         struct nfs4_acl *ve_acl;            /* request */
1043 #endif
1044         DECODE_HEAD;
1045
1046         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1047                 goto out;
1048
1049         /* For convenience's sake, we compare raw xdr'd attributes in
1050          * nfsd4_proc_verify; however we still decode here just to return
1051          * correct error in case of bad xdr. */
1052 #if 0
1053         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1054         if (status == nfserr_inval) {
1055                 status = nfserrno(status);
1056                 goto out;
1057         }
1058 #endif
1059         READ_BUF(4);
1060         READ32(verify->ve_attrlen);
1061         READ_BUF(verify->ve_attrlen);
1062         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1063
1064         DECODE_TAIL;
1065 }
1066
1067 static __be32
1068 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1069 {
1070         int avail;
1071         int v;
1072         int len;
1073         DECODE_HEAD;
1074
1075         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1076         if (status)
1077                 return status;
1078         READ_BUF(16);
1079         READ64(write->wr_offset);
1080         READ32(write->wr_stable_how);
1081         if (write->wr_stable_how > 2)
1082                 goto xdr_error;
1083         READ32(write->wr_buflen);
1084
1085         /* Sorry .. no magic macros for this.. *
1086          * READ_BUF(write->wr_buflen);
1087          * SAVEMEM(write->wr_buf, write->wr_buflen);
1088          */
1089         avail = (char*)argp->end - (char*)argp->p;
1090         if (avail + argp->pagelen < write->wr_buflen) {
1091                 dprintk("NFSD: xdr error (%s:%d)\n",
1092                                 __FILE__, __LINE__);
1093                 goto xdr_error;
1094         }
1095         argp->rqstp->rq_vec[0].iov_base = p;
1096         argp->rqstp->rq_vec[0].iov_len = avail;
1097         v = 0;
1098         len = write->wr_buflen;
1099         while (len > argp->rqstp->rq_vec[v].iov_len) {
1100                 len -= argp->rqstp->rq_vec[v].iov_len;
1101                 v++;
1102                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
1103                 argp->pagelist++;
1104                 if (argp->pagelen >= PAGE_SIZE) {
1105                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1106                         argp->pagelen -= PAGE_SIZE;
1107                 } else {
1108                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1109                         argp->pagelen -= len;
1110                 }
1111         }
1112         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1113         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1114         argp->rqstp->rq_vec[v].iov_len = len;
1115         write->wr_vlen = v+1;
1116
1117         DECODE_TAIL;
1118 }
1119
1120 static __be32
1121 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1122 {
1123         DECODE_HEAD;
1124
1125         READ_BUF(12);
1126         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1127         READ32(rlockowner->rl_owner.len);
1128         READ_BUF(rlockowner->rl_owner.len);
1129         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1130
1131         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1132                 return nfserr_inval;
1133         DECODE_TAIL;
1134 }
1135
1136 static __be32
1137 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1138                          struct nfsd4_exchange_id *exid)
1139 {
1140         int dummy, tmp;
1141         DECODE_HEAD;
1142
1143         READ_BUF(NFS4_VERIFIER_SIZE);
1144         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1145
1146         status = nfsd4_decode_opaque(argp, &exid->clname);
1147         if (status)
1148                 return nfserr_bad_xdr;
1149
1150         READ_BUF(4);
1151         READ32(exid->flags);
1152
1153         /* Ignore state_protect4_a */
1154         READ_BUF(4);
1155         READ32(exid->spa_how);
1156         switch (exid->spa_how) {
1157         case SP4_NONE:
1158                 break;
1159         case SP4_MACH_CRED:
1160                 /* spo_must_enforce */
1161                 READ_BUF(4);
1162                 READ32(dummy);
1163                 READ_BUF(dummy * 4);
1164                 p += dummy;
1165
1166                 /* spo_must_allow */
1167                 READ_BUF(4);
1168                 READ32(dummy);
1169                 READ_BUF(dummy * 4);
1170                 p += dummy;
1171                 break;
1172         case SP4_SSV:
1173                 /* ssp_ops */
1174                 READ_BUF(4);
1175                 READ32(dummy);
1176                 READ_BUF(dummy * 4);
1177                 p += dummy;
1178
1179                 READ_BUF(4);
1180                 READ32(dummy);
1181                 READ_BUF(dummy * 4);
1182                 p += dummy;
1183
1184                 /* ssp_hash_algs<> */
1185                 READ_BUF(4);
1186                 READ32(tmp);
1187                 while (tmp--) {
1188                         READ_BUF(4);
1189                         READ32(dummy);
1190                         READ_BUF(dummy);
1191                         p += XDR_QUADLEN(dummy);
1192                 }
1193
1194                 /* ssp_encr_algs<> */
1195                 READ_BUF(4);
1196                 READ32(tmp);
1197                 while (tmp--) {
1198                         READ_BUF(4);
1199                         READ32(dummy);
1200                         READ_BUF(dummy);
1201                         p += XDR_QUADLEN(dummy);
1202                 }
1203
1204                 /* ssp_window and ssp_num_gss_handles */
1205                 READ_BUF(8);
1206                 READ32(dummy);
1207                 READ32(dummy);
1208                 break;
1209         default:
1210                 goto xdr_error;
1211         }
1212
1213         /* Ignore Implementation ID */
1214         READ_BUF(4);    /* nfs_impl_id4 array length */
1215         READ32(dummy);
1216
1217         if (dummy > 1)
1218                 goto xdr_error;
1219
1220         if (dummy == 1) {
1221                 /* nii_domain */
1222                 READ_BUF(4);
1223                 READ32(dummy);
1224                 READ_BUF(dummy);
1225                 p += XDR_QUADLEN(dummy);
1226
1227                 /* nii_name */
1228                 READ_BUF(4);
1229                 READ32(dummy);
1230                 READ_BUF(dummy);
1231                 p += XDR_QUADLEN(dummy);
1232
1233                 /* nii_date */
1234                 READ_BUF(12);
1235                 p += 3;
1236         }
1237         DECODE_TAIL;
1238 }
1239
1240 static __be32
1241 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1242                             struct nfsd4_create_session *sess)
1243 {
1244         DECODE_HEAD;
1245
1246         u32 dummy;
1247         char *machine_name;
1248         int i;
1249         int nr_secflavs;
1250
1251         READ_BUF(16);
1252         COPYMEM(&sess->clientid, 8);
1253         READ32(sess->seqid);
1254         READ32(sess->flags);
1255
1256         /* Fore channel attrs */
1257         READ_BUF(28);
1258         READ32(dummy); /* headerpadsz is always 0 */
1259         READ32(sess->fore_channel.maxreq_sz);
1260         READ32(sess->fore_channel.maxresp_sz);
1261         READ32(sess->fore_channel.maxresp_cached);
1262         READ32(sess->fore_channel.maxops);
1263         READ32(sess->fore_channel.maxreqs);
1264         READ32(sess->fore_channel.nr_rdma_attrs);
1265         if (sess->fore_channel.nr_rdma_attrs == 1) {
1266                 READ_BUF(4);
1267                 READ32(sess->fore_channel.rdma_attrs);
1268         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1269                 dprintk("Too many fore channel attr bitmaps!\n");
1270                 goto xdr_error;
1271         }
1272
1273         /* Back channel attrs */
1274         READ_BUF(28);
1275         READ32(dummy); /* headerpadsz is always 0 */
1276         READ32(sess->back_channel.maxreq_sz);
1277         READ32(sess->back_channel.maxresp_sz);
1278         READ32(sess->back_channel.maxresp_cached);
1279         READ32(sess->back_channel.maxops);
1280         READ32(sess->back_channel.maxreqs);
1281         READ32(sess->back_channel.nr_rdma_attrs);
1282         if (sess->back_channel.nr_rdma_attrs == 1) {
1283                 READ_BUF(4);
1284                 READ32(sess->back_channel.rdma_attrs);
1285         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1286                 dprintk("Too many back channel attr bitmaps!\n");
1287                 goto xdr_error;
1288         }
1289
1290         READ_BUF(8);
1291         READ32(sess->callback_prog);
1292
1293         /* callback_sec_params4 */
1294         READ32(nr_secflavs);
1295         for (i = 0; i < nr_secflavs; ++i) {
1296                 READ_BUF(4);
1297                 READ32(dummy);
1298                 switch (dummy) {
1299                 case RPC_AUTH_NULL:
1300                         /* Nothing to read */
1301                         break;
1302                 case RPC_AUTH_UNIX:
1303                         READ_BUF(8);
1304                         /* stamp */
1305                         READ32(dummy);
1306
1307                         /* machine name */
1308                         READ32(dummy);
1309                         READ_BUF(dummy);
1310                         SAVEMEM(machine_name, dummy);
1311
1312                         /* uid, gid */
1313                         READ_BUF(8);
1314                         READ32(sess->uid);
1315                         READ32(sess->gid);
1316
1317                         /* more gids */
1318                         READ_BUF(4);
1319                         READ32(dummy);
1320                         READ_BUF(dummy * 4);
1321                         break;
1322                 case RPC_AUTH_GSS:
1323                         dprintk("RPC_AUTH_GSS callback secflavor "
1324                                 "not supported!\n");
1325                         READ_BUF(8);
1326                         /* gcbp_service */
1327                         READ32(dummy);
1328                         /* gcbp_handle_from_server */
1329                         READ32(dummy);
1330                         READ_BUF(dummy);
1331                         p += XDR_QUADLEN(dummy);
1332                         /* gcbp_handle_from_client */
1333                         READ_BUF(4);
1334                         READ32(dummy);
1335                         READ_BUF(dummy);
1336                         break;
1337                 default:
1338                         dprintk("Illegal callback secflavor\n");
1339                         return nfserr_inval;
1340                 }
1341         }
1342         DECODE_TAIL;
1343 }
1344
1345 static __be32
1346 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1347                              struct nfsd4_destroy_session *destroy_session)
1348 {
1349         DECODE_HEAD;
1350         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1351         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1352
1353         DECODE_TAIL;
1354 }
1355
1356 static __be32
1357 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1358                           struct nfsd4_free_stateid *free_stateid)
1359 {
1360         DECODE_HEAD;
1361
1362         READ_BUF(sizeof(stateid_t));
1363         READ32(free_stateid->fr_stateid.si_generation);
1364         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1365
1366         DECODE_TAIL;
1367 }
1368
1369 static __be32
1370 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1371                       struct nfsd4_sequence *seq)
1372 {
1373         DECODE_HEAD;
1374
1375         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1376         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1377         READ32(seq->seqid);
1378         READ32(seq->slotid);
1379         READ32(seq->maxslots);
1380         READ32(seq->cachethis);
1381
1382         DECODE_TAIL;
1383 }
1384
1385 static __be32
1386 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1387 {
1388         unsigned int nbytes;
1389         stateid_t si;
1390         int i;
1391         __be32 *p;
1392         __be32 status;
1393
1394         READ_BUF(4);
1395         test_stateid->ts_num_ids = ntohl(*p++);
1396
1397         nbytes = test_stateid->ts_num_ids * sizeof(stateid_t);
1398         if (nbytes > (u32)((char *)argp->end - (char *)argp->p))
1399                 goto xdr_error;
1400
1401         test_stateid->ts_saved_args = argp;
1402         save_buf(argp, &test_stateid->ts_savedp);
1403
1404         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1405                 status = nfsd4_decode_stateid(argp, &si);
1406                 if (status)
1407                         return status;
1408         }
1409
1410         status = 0;
1411 out:
1412         return status;
1413 xdr_error:
1414         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1415         status = nfserr_bad_xdr;
1416         goto out;
1417 }
1418
1419 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1420 {
1421         DECODE_HEAD;
1422
1423         READ_BUF(8);
1424         COPYMEM(&dc->clientid, 8);
1425
1426         DECODE_TAIL;
1427 }
1428
1429 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1430 {
1431         DECODE_HEAD;
1432
1433         READ_BUF(4);
1434         READ32(rc->rca_one_fs);
1435
1436         DECODE_TAIL;
1437 }
1438
1439 static __be32
1440 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1441 {
1442         return nfs_ok;
1443 }
1444
1445 static __be32
1446 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1447 {
1448         return nfserr_notsupp;
1449 }
1450
1451 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1452
1453 static nfsd4_dec nfsd4_dec_ops[] = {
1454         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1455         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1456         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1457         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1458         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1459         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1460         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1461         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1462         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1463         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1464         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1465         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1466         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1467         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1468         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1469         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1470         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1471         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1472         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1473         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1474         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1475         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1476         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1477         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1478         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1479         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1480         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1481         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1482         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1483         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1484         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1485         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1486         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1487         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1488         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1489         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1490         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1491 };
1492
1493 static nfsd4_dec nfsd41_dec_ops[] = {
1494         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1495         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1496         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1497         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1498         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1499         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1500         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1501         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1502         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1503         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1504         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1505         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1506         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1507         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1508         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1509         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1510         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1511         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1512         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1513         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1514         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1515         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1516         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1517         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1518         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1519         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1520         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1521         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1522         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1523         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1524         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1525         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1526         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1527         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1528         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1529         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1530         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1531
1532         /* new operations for NFSv4.1 */
1533         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1534         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1535         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1536         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1537         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1538         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1539         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1540         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1541         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1542         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1543         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1544         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1545         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1546         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1547         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1548         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1549         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1550         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1551         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1552 };
1553
1554 struct nfsd4_minorversion_ops {
1555         nfsd4_dec *decoders;
1556         int nops;
1557 };
1558
1559 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1560         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1561         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1562 };
1563
1564 static __be32
1565 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1566 {
1567         DECODE_HEAD;
1568         struct nfsd4_op *op;
1569         struct nfsd4_minorversion_ops *ops;
1570         bool cachethis = false;
1571         int i;
1572
1573         /*
1574          * XXX: According to spec, we should check the tag
1575          * for UTF-8 compliance.  I'm postponing this for
1576          * now because it seems that some clients do use
1577          * binary tags.
1578          */
1579         READ_BUF(4);
1580         READ32(argp->taglen);
1581         READ_BUF(argp->taglen + 8);
1582         SAVEMEM(argp->tag, argp->taglen);
1583         READ32(argp->minorversion);
1584         READ32(argp->opcnt);
1585
1586         if (argp->taglen > NFSD4_MAX_TAGLEN)
1587                 goto xdr_error;
1588         if (argp->opcnt > 100)
1589                 goto xdr_error;
1590
1591         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1592                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1593                 if (!argp->ops) {
1594                         argp->ops = argp->iops;
1595                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1596                         goto xdr_error;
1597                 }
1598         }
1599
1600         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1601                 argp->opcnt = 0;
1602
1603         ops = &nfsd4_minorversion[argp->minorversion];
1604         for (i = 0; i < argp->opcnt; i++) {
1605                 op = &argp->ops[i];
1606                 op->replay = NULL;
1607
1608                 /*
1609                  * We can't use READ_BUF() here because we need to handle
1610                  * a missing opcode as an OP_WRITE + 1. So we need to check
1611                  * to see if we're truly at the end of our buffer or if there
1612                  * is another page we need to flip to.
1613                  */
1614
1615                 if (argp->p == argp->end) {
1616                         if (argp->pagelen < 4) {
1617                                 /* There isn't an opcode still on the wire */
1618                                 op->opnum = OP_WRITE + 1;
1619                                 op->status = nfserr_bad_xdr;
1620                                 argp->opcnt = i+1;
1621                                 break;
1622                         }
1623
1624                         /*
1625                          * False alarm. We just hit a page boundary, but there
1626                          * is still data available.  Move pointer across page
1627                          * boundary.  *snip from READ_BUF*
1628                          */
1629                         argp->p = page_address(argp->pagelist[0]);
1630                         argp->pagelist++;
1631                         if (argp->pagelen < PAGE_SIZE) {
1632                                 argp->end = argp->p + (argp->pagelen>>2);
1633                                 argp->pagelen = 0;
1634                         } else {
1635                                 argp->end = argp->p + (PAGE_SIZE>>2);
1636                                 argp->pagelen -= PAGE_SIZE;
1637                         }
1638                 }
1639                 op->opnum = ntohl(*argp->p++);
1640
1641                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1642                         op->status = ops->decoders[op->opnum](argp, &op->u);
1643                 else {
1644                         op->opnum = OP_ILLEGAL;
1645                         op->status = nfserr_op_illegal;
1646                 }
1647
1648                 if (op->status) {
1649                         argp->opcnt = i+1;
1650                         break;
1651                 }
1652                 /*
1653                  * We'll try to cache the result in the DRC if any one
1654                  * op in the compound wants to be cached:
1655                  */
1656                 cachethis |= nfsd4_cache_this_op(op);
1657         }
1658         /* Sessions make the DRC unnecessary: */
1659         if (argp->minorversion)
1660                 cachethis = false;
1661         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1662
1663         DECODE_TAIL;
1664 }
1665
1666 #define WRITE32(n)               *p++ = htonl(n)
1667 #define WRITE64(n)               do {                           \
1668         *p++ = htonl((u32)((n) >> 32));                         \
1669         *p++ = htonl((u32)(n));                                 \
1670 } while (0)
1671 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1672         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1673         memcpy(p, ptr, nbytes);                                 \
1674         p += XDR_QUADLEN(nbytes);                               \
1675 }} while (0)
1676
1677 static void write32(__be32 **p, u32 n)
1678 {
1679         *(*p)++ = n;
1680 }
1681
1682 static void write64(__be32 **p, u64 n)
1683 {
1684         write32(p, (u32)(n >> 32));
1685         write32(p, (u32)n);
1686 }
1687
1688 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1689 {
1690         if (IS_I_VERSION(inode)) {
1691                 write64(p, inode->i_version);
1692         } else {
1693                 write32(p, stat->ctime.tv_sec);
1694                 write32(p, stat->ctime.tv_nsec);
1695         }
1696 }
1697
1698 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1699 {
1700         write32(p, c->atomic);
1701         if (c->change_supported) {
1702                 write64(p, c->before_change);
1703                 write64(p, c->after_change);
1704         } else {
1705                 write32(p, c->before_ctime_sec);
1706                 write32(p, c->before_ctime_nsec);
1707                 write32(p, c->after_ctime_sec);
1708                 write32(p, c->after_ctime_nsec);
1709         }
1710 }
1711
1712 #define RESERVE_SPACE(nbytes)   do {                            \
1713         p = resp->p;                                            \
1714         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1715 } while (0)
1716 #define ADJUST_ARGS()           resp->p = p
1717
1718 /*
1719  * Header routine to setup seqid operation replay cache
1720  */
1721 #define ENCODE_SEQID_OP_HEAD                                    \
1722         __be32 *save;                                           \
1723                                                                 \
1724         save = resp->p;
1725
1726 /*
1727  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1728  * is where sequence id's are incremented, and the replay cache is filled.
1729  * Note that we increment sequence id's here, at the last moment, so we're sure
1730  * we know whether the error to be returned is a sequence id mutating error.
1731  */
1732
1733 static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1734 {
1735         struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1736
1737         if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1738                 stateowner->so_seqid++;
1739                 stateowner->so_replay.rp_status = nfserr;
1740                 stateowner->so_replay.rp_buflen =
1741                           (char *)resp->p - (char *)save;
1742                 memcpy(stateowner->so_replay.rp_buf, save,
1743                         stateowner->so_replay.rp_buflen);
1744                 nfsd4_purge_closed_stateid(stateowner);
1745         }
1746 }
1747
1748 /* Encode as an array of strings the string given with components
1749  * separated @sep.
1750  */
1751 static __be32 nfsd4_encode_components(char sep, char *components,
1752                                    __be32 **pp, int *buflen)
1753 {
1754         __be32 *p = *pp;
1755         __be32 *countp = p;
1756         int strlen, count=0;
1757         char *str, *end;
1758
1759         dprintk("nfsd4_encode_components(%s)\n", components);
1760         if ((*buflen -= 4) < 0)
1761                 return nfserr_resource;
1762         WRITE32(0); /* We will fill this in with @count later */
1763         end = str = components;
1764         while (*end) {
1765                 for (; *end && (*end != sep); end++)
1766                         ; /* Point to end of component */
1767                 strlen = end - str;
1768                 if (strlen) {
1769                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1770                                 return nfserr_resource;
1771                         WRITE32(strlen);
1772                         WRITEMEM(str, strlen);
1773                         count++;
1774                 }
1775                 else
1776                         end++;
1777                 str = end;
1778         }
1779         *pp = p;
1780         p = countp;
1781         WRITE32(count);
1782         return 0;
1783 }
1784
1785 /*
1786  * encode a location element of a fs_locations structure
1787  */
1788 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1789                                     __be32 **pp, int *buflen)
1790 {
1791         __be32 status;
1792         __be32 *p = *pp;
1793
1794         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1795         if (status)
1796                 return status;
1797         status = nfsd4_encode_components('/', location->path, &p, buflen);
1798         if (status)
1799                 return status;
1800         *pp = p;
1801         return 0;
1802 }
1803
1804 /*
1805  * Encode a path in RFC3530 'pathname4' format
1806  */
1807 static __be32 nfsd4_encode_path(const struct path *root,
1808                 const struct path *path, __be32 **pp, int *buflen)
1809 {
1810         struct path cur = {
1811                 .mnt = path->mnt,
1812                 .dentry = path->dentry,
1813         };
1814         __be32 *p = *pp;
1815         struct dentry **components = NULL;
1816         unsigned int ncomponents = 0;
1817         __be32 err = nfserr_jukebox;
1818
1819         dprintk("nfsd4_encode_components(");
1820
1821         path_get(&cur);
1822         /* First walk the path up to the nfsd root, and store the
1823          * dentries/path components in an array.
1824          */
1825         for (;;) {
1826                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1827                         break;
1828                 if (cur.dentry == cur.mnt->mnt_root) {
1829                         if (follow_up(&cur))
1830                                 continue;
1831                         goto out_free;
1832                 }
1833                 if ((ncomponents & 15) == 0) {
1834                         struct dentry **new;
1835                         new = krealloc(components,
1836                                         sizeof(*new) * (ncomponents + 16),
1837                                         GFP_KERNEL);
1838                         if (!new)
1839                                 goto out_free;
1840                         components = new;
1841                 }
1842                 components[ncomponents++] = cur.dentry;
1843                 cur.dentry = dget_parent(cur.dentry);
1844         }
1845
1846         *buflen -= 4;
1847         if (*buflen < 0)
1848                 goto out_free;
1849         WRITE32(ncomponents);
1850
1851         while (ncomponents) {
1852                 struct dentry *dentry = components[ncomponents - 1];
1853                 unsigned int len = dentry->d_name.len;
1854
1855                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1856                 if (*buflen < 0)
1857                         goto out_free;
1858                 WRITE32(len);
1859                 WRITEMEM(dentry->d_name.name, len);
1860                 dprintk("/%s", dentry->d_name.name);
1861                 dput(dentry);
1862                 ncomponents--;
1863         }
1864
1865         *pp = p;
1866         err = 0;
1867 out_free:
1868         dprintk(")\n");
1869         while (ncomponents)
1870                 dput(components[--ncomponents]);
1871         kfree(components);
1872         path_put(&cur);
1873         return err;
1874 }
1875
1876 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1877                 const struct path *path, __be32 **pp, int *buflen)
1878 {
1879         struct svc_export *exp_ps;
1880         __be32 res;
1881
1882         exp_ps = rqst_find_fsidzero_export(rqstp);
1883         if (IS_ERR(exp_ps))
1884                 return nfserrno(PTR_ERR(exp_ps));
1885         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1886         exp_put(exp_ps);
1887         return res;
1888 }
1889
1890 /*
1891  *  encode a fs_locations structure
1892  */
1893 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1894                                      struct svc_export *exp,
1895                                      __be32 **pp, int *buflen)
1896 {
1897         __be32 status;
1898         int i;
1899         __be32 *p = *pp;
1900         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1901
1902         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1903         if (status)
1904                 return status;
1905         if ((*buflen -= 4) < 0)
1906                 return nfserr_resource;
1907         WRITE32(fslocs->locations_count);
1908         for (i=0; i<fslocs->locations_count; i++) {
1909                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1910                                                    &p, buflen);
1911                 if (status)
1912                         return status;
1913         }
1914         *pp = p;
1915         return 0;
1916 }
1917
1918 static u32 nfs4_file_type(umode_t mode)
1919 {
1920         switch (mode & S_IFMT) {
1921         case S_IFIFO:   return NF4FIFO;
1922         case S_IFCHR:   return NF4CHR;
1923         case S_IFDIR:   return NF4DIR;
1924         case S_IFBLK:   return NF4BLK;
1925         case S_IFLNK:   return NF4LNK;
1926         case S_IFREG:   return NF4REG;
1927         case S_IFSOCK:  return NF4SOCK;
1928         default:        return NF4BAD;
1929         };
1930 }
1931
1932 static __be32
1933 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1934                         __be32 **p, int *buflen)
1935 {
1936         int status;
1937
1938         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1939                 return nfserr_resource;
1940         if (whotype != NFS4_ACL_WHO_NAMED)
1941                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1942         else if (group)
1943                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1944         else
1945                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1946         if (status < 0)
1947                 return nfserrno(status);
1948         *p = xdr_encode_opaque(*p, NULL, status);
1949         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1950         BUG_ON(*buflen < 0);
1951         return 0;
1952 }
1953
1954 static inline __be32
1955 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1956 {
1957         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1958 }
1959
1960 static inline __be32
1961 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1962 {
1963         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1964 }
1965
1966 static inline __be32
1967 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1968                 __be32 **p, int *buflen)
1969 {
1970         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1971 }
1972
1973 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1974                               FATTR4_WORD0_RDATTR_ERROR)
1975 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1976
1977 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1978 {
1979         /* As per referral draft:  */
1980         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1981             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1982                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1983                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1984                         *rdattr_err = NFSERR_MOVED;
1985                 else
1986                         return nfserr_moved;
1987         }
1988         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1989         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1990         return 0;
1991 }
1992
1993 /*
1994  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1995  * ourselves.
1996  *
1997  * @countp is the buffer size in _words_; upon successful return this becomes
1998  * replaced with the number of words written.
1999  */
2000 __be32
2001 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2002                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
2003                 struct svc_rqst *rqstp, int ignore_crossmnt)
2004 {
2005         u32 bmval0 = bmval[0];
2006         u32 bmval1 = bmval[1];
2007         u32 bmval2 = bmval[2];
2008         struct kstat stat;
2009         struct svc_fh tempfh;
2010         struct kstatfs statfs;
2011         int buflen = *countp << 2;
2012         __be32 *attrlenp;
2013         u32 dummy;
2014         u64 dummy64;
2015         u32 rdattr_err = 0;
2016         __be32 *p = buffer;
2017         __be32 status;
2018         int err;
2019         int aclsupport = 0;
2020         struct nfs4_acl *acl = NULL;
2021         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2022         u32 minorversion = resp->cstate.minorversion;
2023         struct path path = {
2024                 .mnt    = exp->ex_path.mnt,
2025                 .dentry = dentry,
2026         };
2027
2028         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2029         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2030         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2031         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2032
2033         if (exp->ex_fslocs.migrated) {
2034                 BUG_ON(bmval[2]);
2035                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2036                 if (status)
2037                         goto out;
2038         }
2039
2040         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2041         if (err)
2042                 goto out_nfserr;
2043         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2044                         FATTR4_WORD0_MAXNAME)) ||
2045             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2046                        FATTR4_WORD1_SPACE_TOTAL))) {
2047                 err = vfs_statfs(&path, &statfs);
2048                 if (err)
2049                         goto out_nfserr;
2050         }
2051         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2052                 fh_init(&tempfh, NFS4_FHSIZE);
2053                 status = fh_compose(&tempfh, exp, dentry, NULL);
2054                 if (status)
2055                         goto out;
2056                 fhp = &tempfh;
2057         }
2058         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2059                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2060                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2061                 aclsupport = (err == 0);
2062                 if (bmval0 & FATTR4_WORD0_ACL) {
2063                         if (err == -EOPNOTSUPP)
2064                                 bmval0 &= ~FATTR4_WORD0_ACL;
2065                         else if (err == -EINVAL) {
2066                                 status = nfserr_attrnotsupp;
2067                                 goto out;
2068                         } else if (err != 0)
2069                                 goto out_nfserr;
2070                 }
2071         }
2072
2073         if (bmval2) {
2074                 if ((buflen -= 16) < 0)
2075                         goto out_resource;
2076                 WRITE32(3);
2077                 WRITE32(bmval0);
2078                 WRITE32(bmval1);
2079                 WRITE32(bmval2);
2080         } else if (bmval1) {
2081                 if ((buflen -= 12) < 0)
2082                         goto out_resource;
2083                 WRITE32(2);
2084                 WRITE32(bmval0);
2085                 WRITE32(bmval1);
2086         } else {
2087                 if ((buflen -= 8) < 0)
2088                         goto out_resource;
2089                 WRITE32(1);
2090                 WRITE32(bmval0);
2091         }
2092         attrlenp = p++;                /* to be backfilled later */
2093
2094         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2095                 u32 word0 = nfsd_suppattrs0(minorversion);
2096                 u32 word1 = nfsd_suppattrs1(minorversion);
2097                 u32 word2 = nfsd_suppattrs2(minorversion);
2098
2099                 if (!aclsupport)
2100                         word0 &= ~FATTR4_WORD0_ACL;
2101                 if (!word2) {
2102                         if ((buflen -= 12) < 0)
2103                                 goto out_resource;
2104                         WRITE32(2);
2105                         WRITE32(word0);
2106                         WRITE32(word1);
2107                 } else {
2108                         if ((buflen -= 16) < 0)
2109                                 goto out_resource;
2110                         WRITE32(3);
2111                         WRITE32(word0);
2112                         WRITE32(word1);
2113                         WRITE32(word2);
2114                 }
2115         }
2116         if (bmval0 & FATTR4_WORD0_TYPE) {
2117                 if ((buflen -= 4) < 0)
2118                         goto out_resource;
2119                 dummy = nfs4_file_type(stat.mode);
2120                 if (dummy == NF4BAD)
2121                         goto out_serverfault;
2122                 WRITE32(dummy);
2123         }
2124         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2125                 if ((buflen -= 4) < 0)
2126                         goto out_resource;
2127                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2128                         WRITE32(NFS4_FH_PERSISTENT);
2129                 else
2130                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2131         }
2132         if (bmval0 & FATTR4_WORD0_CHANGE) {
2133                 if ((buflen -= 8) < 0)
2134                         goto out_resource;
2135                 write_change(&p, &stat, dentry->d_inode);
2136         }
2137         if (bmval0 & FATTR4_WORD0_SIZE) {
2138                 if ((buflen -= 8) < 0)
2139                         goto out_resource;
2140                 WRITE64(stat.size);
2141         }
2142         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2143                 if ((buflen -= 4) < 0)
2144                         goto out_resource;
2145                 WRITE32(1);
2146         }
2147         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2148                 if ((buflen -= 4) < 0)
2149                         goto out_resource;
2150                 WRITE32(1);
2151         }
2152         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2153                 if ((buflen -= 4) < 0)
2154                         goto out_resource;
2155                 WRITE32(0);
2156         }
2157         if (bmval0 & FATTR4_WORD0_FSID) {
2158                 if ((buflen -= 16) < 0)
2159                         goto out_resource;
2160                 if (exp->ex_fslocs.migrated) {
2161                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2162                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2163                 } else switch(fsid_source(fhp)) {
2164                 case FSIDSOURCE_FSID:
2165                         WRITE64((u64)exp->ex_fsid);
2166                         WRITE64((u64)0);
2167                         break;
2168                 case FSIDSOURCE_DEV:
2169                         WRITE32(0);
2170                         WRITE32(MAJOR(stat.dev));
2171                         WRITE32(0);
2172                         WRITE32(MINOR(stat.dev));
2173                         break;
2174                 case FSIDSOURCE_UUID:
2175                         WRITEMEM(exp->ex_uuid, 16);
2176                         break;
2177                 }
2178         }
2179         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2180                 if ((buflen -= 4) < 0)
2181                         goto out_resource;
2182                 WRITE32(0);
2183         }
2184         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2185                 if ((buflen -= 4) < 0)
2186                         goto out_resource;
2187                 WRITE32(nfsd4_lease);
2188         }
2189         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2190                 if ((buflen -= 4) < 0)
2191                         goto out_resource;
2192                 WRITE32(rdattr_err);
2193         }
2194         if (bmval0 & FATTR4_WORD0_ACL) {
2195                 struct nfs4_ace *ace;
2196
2197                 if (acl == NULL) {
2198                         if ((buflen -= 4) < 0)
2199                                 goto out_resource;
2200
2201                         WRITE32(0);
2202                         goto out_acl;
2203                 }
2204                 if ((buflen -= 4) < 0)
2205                         goto out_resource;
2206                 WRITE32(acl->naces);
2207
2208                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2209                         if ((buflen -= 4*3) < 0)
2210                                 goto out_resource;
2211                         WRITE32(ace->type);
2212                         WRITE32(ace->flag);
2213                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2214                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
2215                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2216                                 &p, &buflen);
2217                         if (status == nfserr_resource)
2218                                 goto out_resource;
2219                         if (status)
2220                                 goto out;
2221                 }
2222         }
2223 out_acl:
2224         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2225                 if ((buflen -= 4) < 0)
2226                         goto out_resource;
2227                 WRITE32(aclsupport ?
2228                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2229         }
2230         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2231                 if ((buflen -= 4) < 0)
2232                         goto out_resource;
2233                 WRITE32(1);
2234         }
2235         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2236                 if ((buflen -= 4) < 0)
2237                         goto out_resource;
2238                 WRITE32(1);
2239         }
2240         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2241                 if ((buflen -= 4) < 0)
2242                         goto out_resource;
2243                 WRITE32(1);
2244         }
2245         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2246                 if ((buflen -= 4) < 0)
2247                         goto out_resource;
2248                 WRITE32(1);
2249         }
2250         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2251                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2252                 if (buflen < 0)
2253                         goto out_resource;
2254                 WRITE32(fhp->fh_handle.fh_size);
2255                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2256         }
2257         if (bmval0 & FATTR4_WORD0_FILEID) {
2258                 if ((buflen -= 8) < 0)
2259                         goto out_resource;
2260                 WRITE64(stat.ino);
2261         }
2262         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2263                 if ((buflen -= 8) < 0)
2264                         goto out_resource;
2265                 WRITE64((u64) statfs.f_ffree);
2266         }
2267         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2268                 if ((buflen -= 8) < 0)
2269                         goto out_resource;
2270                 WRITE64((u64) statfs.f_ffree);
2271         }
2272         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2273                 if ((buflen -= 8) < 0)
2274                         goto out_resource;
2275                 WRITE64((u64) statfs.f_files);
2276         }
2277         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2278                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2279                 if (status == nfserr_resource)
2280                         goto out_resource;
2281                 if (status)
2282                         goto out;
2283         }
2284         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2285                 if ((buflen -= 4) < 0)
2286                         goto out_resource;
2287                 WRITE32(1);
2288         }
2289         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2290                 if ((buflen -= 8) < 0)
2291                         goto out_resource;
2292                 WRITE64(~(u64)0);
2293         }
2294         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2295                 if ((buflen -= 4) < 0)
2296                         goto out_resource;
2297                 WRITE32(255);
2298         }
2299         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2300                 if ((buflen -= 4) < 0)
2301                         goto out_resource;
2302                 WRITE32(statfs.f_namelen);
2303         }
2304         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2305                 if ((buflen -= 8) < 0)
2306                         goto out_resource;
2307                 WRITE64((u64) svc_max_payload(rqstp));
2308         }
2309         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2310                 if ((buflen -= 8) < 0)
2311                         goto out_resource;
2312                 WRITE64((u64) svc_max_payload(rqstp));
2313         }
2314         if (bmval1 & FATTR4_WORD1_MODE) {
2315                 if ((buflen -= 4) < 0)
2316                         goto out_resource;
2317                 WRITE32(stat.mode & S_IALLUGO);
2318         }
2319         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2320                 if ((buflen -= 4) < 0)
2321                         goto out_resource;
2322                 WRITE32(1);
2323         }
2324         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2325                 if ((buflen -= 4) < 0)
2326                         goto out_resource;
2327                 WRITE32(stat.nlink);
2328         }
2329         if (bmval1 & FATTR4_WORD1_OWNER) {
2330                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2331                 if (status == nfserr_resource)
2332                         goto out_resource;
2333                 if (status)
2334                         goto out;
2335         }
2336         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2337                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2338                 if (status == nfserr_resource)
2339                         goto out_resource;
2340                 if (status)
2341                         goto out;
2342         }
2343         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2344                 if ((buflen -= 8) < 0)
2345                         goto out_resource;
2346                 WRITE32((u32) MAJOR(stat.rdev));
2347                 WRITE32((u32) MINOR(stat.rdev));
2348         }
2349         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2350                 if ((buflen -= 8) < 0)
2351                         goto out_resource;
2352                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2353                 WRITE64(dummy64);
2354         }
2355         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2356                 if ((buflen -= 8) < 0)
2357                         goto out_resource;
2358                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2359                 WRITE64(dummy64);
2360         }
2361         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2362                 if ((buflen -= 8) < 0)
2363                         goto out_resource;
2364                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2365                 WRITE64(dummy64);
2366         }
2367         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2368                 if ((buflen -= 8) < 0)
2369                         goto out_resource;
2370                 dummy64 = (u64)stat.blocks << 9;
2371                 WRITE64(dummy64);
2372         }
2373         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2374                 if ((buflen -= 12) < 0)
2375                         goto out_resource;
2376                 WRITE32(0);
2377                 WRITE32(stat.atime.tv_sec);
2378                 WRITE32(stat.atime.tv_nsec);
2379         }
2380         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2381                 if ((buflen -= 12) < 0)
2382                         goto out_resource;
2383                 WRITE32(0);
2384                 WRITE32(1);
2385                 WRITE32(0);
2386         }
2387         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2388                 if ((buflen -= 12) < 0)
2389                         goto out_resource;
2390                 WRITE32(0);
2391                 WRITE32(stat.ctime.tv_sec);
2392                 WRITE32(stat.ctime.tv_nsec);
2393         }
2394         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2395                 if ((buflen -= 12) < 0)
2396                         goto out_resource;
2397                 WRITE32(0);
2398                 WRITE32(stat.mtime.tv_sec);
2399                 WRITE32(stat.mtime.tv_nsec);
2400         }
2401         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2402                 if ((buflen -= 8) < 0)
2403                         goto out_resource;
2404                 /*
2405                  * Get parent's attributes if not ignoring crossmount
2406                  * and this is the root of a cross-mounted filesystem.
2407                  */
2408                 if (ignore_crossmnt == 0 &&
2409                     dentry == exp->ex_path.mnt->mnt_root) {
2410                         struct path path = exp->ex_path;
2411                         path_get(&path);
2412                         while (follow_up(&path)) {
2413                                 if (path.dentry != path.mnt->mnt_root)
2414                                         break;
2415                         }
2416                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2417                         path_put(&path);
2418                         if (err)
2419                                 goto out_nfserr;
2420                 }
2421                 WRITE64(stat.ino);
2422         }
2423         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2424                 WRITE32(3);
2425                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2426                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2427                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2428         }
2429
2430         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2431         *countp = p - buffer;
2432         status = nfs_ok;
2433
2434 out:
2435         kfree(acl);
2436         if (fhp == &tempfh)
2437                 fh_put(&tempfh);
2438         return status;
2439 out_nfserr:
2440         status = nfserrno(err);
2441         goto out;
2442 out_resource:
2443         *countp = 0;
2444         status = nfserr_resource;
2445         goto out;
2446 out_serverfault:
2447         status = nfserr_serverfault;
2448         goto out;
2449 }
2450
2451 static inline int attributes_need_mount(u32 *bmval)
2452 {
2453         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2454                 return 1;
2455         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2456                 return 1;
2457         return 0;
2458 }
2459
2460 static __be32
2461 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2462                 const char *name, int namlen, __be32 *p, int *buflen)
2463 {
2464         struct svc_export *exp = cd->rd_fhp->fh_export;
2465         struct dentry *dentry;
2466         __be32 nfserr;
2467         int ignore_crossmnt = 0;
2468
2469         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2470         if (IS_ERR(dentry))
2471                 return nfserrno(PTR_ERR(dentry));
2472         if (!dentry->d_inode) {
2473                 /*
2474                  * nfsd_buffered_readdir drops the i_mutex between
2475                  * readdir and calling this callback, leaving a window
2476                  * where this directory entry could have gone away.
2477                  */
2478                 dput(dentry);
2479                 return nfserr_noent;
2480         }
2481
2482         exp_get(exp);
2483         /*
2484          * In the case of a mountpoint, the client may be asking for
2485          * attributes that are only properties of the underlying filesystem
2486          * as opposed to the cross-mounted file system. In such a case,
2487          * we will not follow the cross mount and will fill the attribtutes
2488          * directly from the mountpoint dentry.
2489          */
2490         if (nfsd_mountpoint(dentry, exp)) {
2491                 int err;
2492
2493                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2494                                 && !attributes_need_mount(cd->rd_bmval)) {
2495                         ignore_crossmnt = 1;
2496                         goto out_encode;
2497                 }
2498                 /*
2499                  * Why the heck aren't we just using nfsd_lookup??
2500                  * Different "."/".." handling?  Something else?
2501                  * At least, add a comment here to explain....
2502                  */
2503                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2504                 if (err) {
2505                         nfserr = nfserrno(err);
2506                         goto out_put;
2507                 }
2508                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2509                 if (nfserr)
2510                         goto out_put;
2511
2512         }
2513 out_encode:
2514         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2515                                         cd->rd_rqstp, ignore_crossmnt);
2516 out_put:
2517         dput(dentry);
2518         exp_put(exp);
2519         return nfserr;
2520 }
2521
2522 static __be32 *
2523 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2524 {
2525         __be32 *attrlenp;
2526
2527         if (buflen < 6)
2528                 return NULL;
2529         *p++ = htonl(2);
2530         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2531         *p++ = htonl(0);                         /* bmval1 */
2532
2533         attrlenp = p++;
2534         *p++ = nfserr;       /* no htonl */
2535         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2536         return p;
2537 }
2538
2539 static int
2540 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2541                     loff_t offset, u64 ino, unsigned int d_type)
2542 {
2543         struct readdir_cd *ccd = ccdv;
2544         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2545         int buflen;
2546         __be32 *p = cd->buffer;
2547         __be32 *cookiep;
2548         __be32 nfserr = nfserr_toosmall;
2549
2550         /* In nfsv4, "." and ".." never make it onto the wire.. */
2551         if (name && isdotent(name, namlen)) {
2552                 cd->common.err = nfs_ok;
2553                 return 0;
2554         }
2555
2556         if (cd->offset)
2557                 xdr_encode_hyper(cd->offset, (u64) offset);
2558
2559         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2560         if (buflen < 0)
2561                 goto fail;
2562
2563         *p++ = xdr_one;                             /* mark entry present */
2564         cookiep = p;
2565         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2566         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2567
2568         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2569         switch (nfserr) {
2570         case nfs_ok:
2571                 p += buflen;
2572                 break;
2573         case nfserr_resource:
2574                 nfserr = nfserr_toosmall;
2575                 goto fail;
2576         case nfserr_noent:
2577                 goto skip_entry;
2578         default:
2579                 /*
2580                  * If the client requested the RDATTR_ERROR attribute,
2581                  * we stuff the error code into this attribute
2582                  * and continue.  If this attribute was not requested,
2583                  * then in accordance with the spec, we fail the
2584                  * entire READDIR operation(!)
2585                  */
2586                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2587                         goto fail;
2588                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2589                 if (p == NULL) {
2590                         nfserr = nfserr_toosmall;
2591                         goto fail;
2592                 }
2593         }
2594         cd->buflen -= (p - cd->buffer);
2595         cd->buffer = p;
2596         cd->offset = cookiep;
2597 skip_entry:
2598         cd->common.err = nfs_ok;
2599         return 0;
2600 fail:
2601         cd->common.err = nfserr;
2602         return -EINVAL;
2603 }
2604
2605 static void
2606 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2607 {
2608         __be32 *p;
2609
2610         RESERVE_SPACE(sizeof(stateid_t));
2611         WRITE32(sid->si_generation);
2612         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2613         ADJUST_ARGS();
2614 }
2615
2616 static __be32
2617 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2618 {
2619         __be32 *p;
2620
2621         if (!nfserr) {
2622                 RESERVE_SPACE(8);
2623                 WRITE32(access->ac_supported);
2624                 WRITE32(access->ac_resp_access);
2625                 ADJUST_ARGS();
2626         }
2627         return nfserr;
2628 }
2629
2630 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2631 {
2632         __be32 *p;
2633
2634         if (!nfserr) {
2635                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2636                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2637                 WRITE32(bcts->dir);
2638                 /* XXX: ? */
2639                 WRITE32(0);
2640                 ADJUST_ARGS();
2641         }
2642         return nfserr;
2643 }
2644
2645 static __be32
2646 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2647 {
2648         ENCODE_SEQID_OP_HEAD;
2649
2650         if (!nfserr)
2651                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2652
2653         encode_seqid_op_tail(resp, save, nfserr);
2654         return nfserr;
2655 }
2656
2657
2658 static __be32
2659 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2660 {
2661         __be32 *p;
2662
2663         if (!nfserr) {
2664                 RESERVE_SPACE(8);
2665                 WRITEMEM(commit->co_verf.data, 8);
2666                 ADJUST_ARGS();
2667         }
2668         return nfserr;
2669 }
2670
2671 static __be32
2672 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2673 {
2674         __be32 *p;
2675
2676         if (!nfserr) {
2677                 RESERVE_SPACE(32);
2678                 write_cinfo(&p, &create->cr_cinfo);
2679                 WRITE32(2);
2680                 WRITE32(create->cr_bmval[0]);
2681                 WRITE32(create->cr_bmval[1]);
2682                 ADJUST_ARGS();
2683         }
2684         return nfserr;
2685 }
2686
2687 static __be32
2688 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2689 {
2690         struct svc_fh *fhp = getattr->ga_fhp;
2691         int buflen;
2692
2693         if (nfserr)
2694                 return nfserr;
2695
2696         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2697         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2698                                     resp->p, &buflen, getattr->ga_bmval,
2699                                     resp->rqstp, 0);
2700         if (!nfserr)
2701                 resp->p += buflen;
2702         return nfserr;
2703 }
2704
2705 static __be32
2706 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2707 {
2708         struct svc_fh *fhp = *fhpp;
2709         unsigned int len;
2710         __be32 *p;
2711
2712         if (!nfserr) {
2713                 len = fhp->fh_handle.fh_size;
2714                 RESERVE_SPACE(len + 4);
2715                 WRITE32(len);
2716                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2717                 ADJUST_ARGS();
2718         }
2719         return nfserr;
2720 }
2721
2722 /*
2723 * Including all fields other than the name, a LOCK4denied structure requires
2724 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2725 */
2726 static void
2727 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2728 {
2729         struct xdr_netobj *conf = &ld->ld_owner;
2730         __be32 *p;
2731
2732         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2733         WRITE64(ld->ld_start);
2734         WRITE64(ld->ld_length);
2735         WRITE32(ld->ld_type);
2736         if (conf->len) {
2737                 WRITEMEM(&ld->ld_clientid, 8);
2738                 WRITE32(conf->len);
2739                 WRITEMEM(conf->data, conf->len);
2740                 kfree(conf->data);
2741         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2742                 WRITE64((u64)0); /* clientid */
2743                 WRITE32(0); /* length of owner name */
2744         }
2745         ADJUST_ARGS();
2746 }
2747
2748 static __be32
2749 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2750 {
2751         ENCODE_SEQID_OP_HEAD;
2752
2753         if (!nfserr)
2754                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2755         else if (nfserr == nfserr_denied)
2756                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2757
2758         encode_seqid_op_tail(resp, save, nfserr);
2759         return nfserr;
2760 }
2761
2762 static __be32
2763 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2764 {
2765         if (nfserr == nfserr_denied)
2766                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2767         return nfserr;
2768 }
2769
2770 static __be32
2771 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2772 {
2773         ENCODE_SEQID_OP_HEAD;
2774
2775         if (!nfserr)
2776                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2777
2778         encode_seqid_op_tail(resp, save, nfserr);
2779         return nfserr;
2780 }
2781
2782
2783 static __be32
2784 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2785 {
2786         __be32 *p;
2787
2788         if (!nfserr) {
2789                 RESERVE_SPACE(20);
2790                 write_cinfo(&p, &link->li_cinfo);
2791                 ADJUST_ARGS();
2792         }
2793         return nfserr;
2794 }
2795
2796
2797 static __be32
2798 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2799 {
2800         __be32 *p;
2801         ENCODE_SEQID_OP_HEAD;
2802
2803         if (nfserr)
2804                 goto out;
2805
2806         nfsd4_encode_stateid(resp, &open->op_stateid);
2807         RESERVE_SPACE(40);
2808         write_cinfo(&p, &open->op_cinfo);
2809         WRITE32(open->op_rflags);
2810         WRITE32(2);
2811         WRITE32(open->op_bmval[0]);
2812         WRITE32(open->op_bmval[1]);
2813         WRITE32(open->op_delegate_type);
2814         ADJUST_ARGS();
2815
2816         switch (open->op_delegate_type) {
2817         case NFS4_OPEN_DELEGATE_NONE:
2818                 break;
2819         case NFS4_OPEN_DELEGATE_READ:
2820                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2821                 RESERVE_SPACE(20);
2822                 WRITE32(open->op_recall);
2823
2824                 /*
2825                  * TODO: ACE's in delegations
2826                  */
2827                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2828                 WRITE32(0);
2829                 WRITE32(0);
2830                 WRITE32(0);   /* XXX: is NULL principal ok? */
2831                 ADJUST_ARGS();
2832                 break;
2833         case NFS4_OPEN_DELEGATE_WRITE:
2834                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2835                 RESERVE_SPACE(32);
2836                 WRITE32(0);
2837
2838                 /*
2839                  * TODO: space_limit's in delegations
2840                  */
2841                 WRITE32(NFS4_LIMIT_SIZE);
2842                 WRITE32(~(u32)0);
2843                 WRITE32(~(u32)0);
2844
2845                 /*
2846                  * TODO: ACE's in delegations
2847                  */
2848                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2849                 WRITE32(0);
2850                 WRITE32(0);
2851                 WRITE32(0);   /* XXX: is NULL principal ok? */
2852                 ADJUST_ARGS();
2853                 break;
2854         default:
2855                 BUG();
2856         }
2857         /* XXX save filehandle here */
2858 out:
2859         encode_seqid_op_tail(resp, save, nfserr);
2860         return nfserr;
2861 }
2862
2863 static __be32
2864 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2865 {
2866         ENCODE_SEQID_OP_HEAD;
2867
2868         if (!nfserr)
2869                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2870
2871         encode_seqid_op_tail(resp, save, nfserr);
2872         return nfserr;
2873 }
2874
2875 static __be32
2876 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2877 {
2878         ENCODE_SEQID_OP_HEAD;
2879
2880         if (!nfserr)
2881                 nfsd4_encode_stateid(resp, &od->od_stateid);
2882
2883         encode_seqid_op_tail(resp, save, nfserr);
2884         return nfserr;
2885 }
2886
2887 static __be32
2888 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2889                   struct nfsd4_read *read)
2890 {
2891         u32 eof;
2892         int v, pn;
2893         unsigned long maxcount;
2894         long len;
2895         __be32 *p;
2896
2897         if (nfserr)
2898                 return nfserr;
2899         if (resp->xbuf->page_len)
2900                 return nfserr_resource;
2901
2902         RESERVE_SPACE(8); /* eof flag and byte count */
2903
2904         maxcount = svc_max_payload(resp->rqstp);
2905         if (maxcount > read->rd_length)
2906                 maxcount = read->rd_length;
2907
2908         len = maxcount;
2909         v = 0;
2910         while (len > 0) {
2911                 pn = resp->rqstp->rq_resused++;
2912                 resp->rqstp->rq_vec[v].iov_base =
2913                         page_address(resp->rqstp->rq_respages[pn]);
2914                 resp->rqstp->rq_vec[v].iov_len =
2915                         len < PAGE_SIZE ? len : PAGE_SIZE;
2916                 v++;
2917                 len -= PAGE_SIZE;
2918         }
2919         read->rd_vlen = v;
2920
2921         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2922                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2923                         &maxcount);
2924
2925         if (nfserr)
2926                 return nfserr;
2927         eof = (read->rd_offset + maxcount >=
2928                read->rd_fhp->fh_dentry->d_inode->i_size);
2929
2930         WRITE32(eof);
2931         WRITE32(maxcount);
2932         ADJUST_ARGS();
2933         resp->xbuf->head[0].iov_len = (char*)p
2934                                         - (char*)resp->xbuf->head[0].iov_base;
2935         resp->xbuf->page_len = maxcount;
2936
2937         /* Use rest of head for padding and remaining ops: */
2938         resp->xbuf->tail[0].iov_base = p;
2939         resp->xbuf->tail[0].iov_len = 0;
2940         if (maxcount&3) {
2941                 RESERVE_SPACE(4);
2942                 WRITE32(0);
2943                 resp->xbuf->tail[0].iov_base += maxcount&3;
2944                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2945                 ADJUST_ARGS();
2946         }
2947         return 0;
2948 }
2949
2950 static __be32
2951 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2952 {
2953         int maxcount;
2954         char *page;
2955         __be32 *p;
2956
2957         if (nfserr)
2958                 return nfserr;
2959         if (resp->xbuf->page_len)
2960                 return nfserr_resource;
2961
2962         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2963
2964         maxcount = PAGE_SIZE;
2965         RESERVE_SPACE(4);
2966
2967         /*
2968          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2969          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2970          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2971          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2972          */
2973         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2974         if (nfserr == nfserr_isdir)
2975                 return nfserr_inval;
2976         if (nfserr)
2977                 return nfserr;
2978
2979         WRITE32(maxcount);
2980         ADJUST_ARGS();
2981         resp->xbuf->head[0].iov_len = (char*)p
2982                                 - (char*)resp->xbuf->head[0].iov_base;
2983         resp->xbuf->page_len = maxcount;
2984
2985         /* Use rest of head for padding and remaining ops: */
2986         resp->xbuf->tail[0].iov_base = p;
2987         resp->xbuf->tail[0].iov_len = 0;
2988         if (maxcount&3) {
2989                 RESERVE_SPACE(4);
2990                 WRITE32(0);
2991                 resp->xbuf->tail[0].iov_base += maxcount&3;
2992                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2993                 ADJUST_ARGS();
2994         }
2995         return 0;
2996 }
2997
2998 static __be32
2999 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3000 {
3001         int maxcount;
3002         loff_t offset;
3003         __be32 *page, *savep, *tailbase;
3004         __be32 *p;
3005
3006         if (nfserr)
3007                 return nfserr;
3008         if (resp->xbuf->page_len)
3009                 return nfserr_resource;
3010
3011         RESERVE_SPACE(8);  /* verifier */
3012         savep = p;
3013
3014         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3015         WRITE32(0);
3016         WRITE32(0);
3017         ADJUST_ARGS();
3018         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3019         tailbase = p;
3020
3021         maxcount = PAGE_SIZE;
3022         if (maxcount > readdir->rd_maxcount)
3023                 maxcount = readdir->rd_maxcount;
3024
3025         /*
3026          * Convert from bytes to words, account for the two words already
3027          * written, make sure to leave two words at the end for the next
3028          * pointer and eof field.
3029          */
3030         maxcount = (maxcount >> 2) - 4;
3031         if (maxcount < 0) {
3032                 nfserr =  nfserr_toosmall;
3033                 goto err_no_verf;
3034         }
3035
3036         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3037         readdir->common.err = 0;
3038         readdir->buflen = maxcount;
3039         readdir->buffer = page;
3040         readdir->offset = NULL;
3041
3042         offset = readdir->rd_cookie;
3043         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3044                               &offset,
3045                               &readdir->common, nfsd4_encode_dirent);
3046         if (nfserr == nfs_ok &&
3047             readdir->common.err == nfserr_toosmall &&
3048             readdir->buffer == page)
3049                 nfserr = nfserr_toosmall;
3050         if (nfserr)
3051                 goto err_no_verf;
3052
3053         if (readdir->offset)
3054                 xdr_encode_hyper(readdir->offset, offset);
3055
3056         p = readdir->buffer;
3057         *p++ = 0;       /* no more entries */
3058         *p++ = htonl(readdir->common.err == nfserr_eof);
3059         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
3060                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
3061
3062         /* Use rest of head for padding and remaining ops: */
3063         resp->xbuf->tail[0].iov_base = tailbase;
3064         resp->xbuf->tail[0].iov_len = 0;
3065         resp->p = resp->xbuf->tail[0].iov_base;
3066         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3067
3068         return 0;
3069 err_no_verf:
3070         p = savep;
3071         ADJUST_ARGS();
3072         return nfserr;
3073 }
3074
3075 static __be32
3076 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3077 {
3078         __be32 *p;
3079
3080         if (!nfserr) {
3081                 RESERVE_SPACE(20);
3082                 write_cinfo(&p, &remove->rm_cinfo);
3083                 ADJUST_ARGS();
3084         }
3085         return nfserr;
3086 }
3087
3088 static __be32
3089 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3090 {
3091         __be32 *p;
3092
3093         if (!nfserr) {
3094                 RESERVE_SPACE(40);
3095                 write_cinfo(&p, &rename->rn_sinfo);
3096                 write_cinfo(&p, &rename->rn_tinfo);
3097                 ADJUST_ARGS();
3098         }
3099         return nfserr;
3100 }
3101
3102 static __be32
3103 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3104                          __be32 nfserr,struct svc_export *exp)
3105 {
3106         int i = 0;
3107         u32 nflavs;
3108         struct exp_flavor_info *flavs;
3109         struct exp_flavor_info def_flavs[2];
3110         __be32 *p;
3111
3112         if (nfserr)
3113                 goto out;
3114         if (exp->ex_nflavors) {
3115                 flavs = exp->ex_flavors;
3116                 nflavs = exp->ex_nflavors;
3117         } else { /* Handling of some defaults in absence of real secinfo: */
3118                 flavs = def_flavs;
3119                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3120                         nflavs = 2;
3121                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3122                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3123                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3124                         nflavs = 1;
3125                         flavs[0].pseudoflavor
3126                                         = svcauth_gss_flavor(exp->ex_client);
3127                 } else {
3128                         nflavs = 1;
3129                         flavs[0].pseudoflavor
3130                                         = exp->ex_client->flavour->flavour;
3131                 }
3132         }
3133
3134         RESERVE_SPACE(4);
3135         WRITE32(nflavs);
3136         ADJUST_ARGS();
3137         for (i = 0; i < nflavs; i++) {
3138                 u32 flav = flavs[i].pseudoflavor;
3139                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3140
3141                 if (gm) {
3142                         RESERVE_SPACE(4);
3143                         WRITE32(RPC_AUTH_GSS);
3144                         ADJUST_ARGS();
3145                         RESERVE_SPACE(4 + gm->gm_oid.len);
3146                         WRITE32(gm->gm_oid.len);
3147                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3148                         ADJUST_ARGS();
3149                         RESERVE_SPACE(4);
3150                         WRITE32(0); /* qop */
3151                         ADJUST_ARGS();
3152                         RESERVE_SPACE(4);
3153                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
3154                         ADJUST_ARGS();
3155                         gss_mech_put(gm);
3156                 } else {
3157                         RESERVE_SPACE(4);
3158                         WRITE32(flav);
3159                         ADJUST_ARGS();
3160                 }
3161         }
3162 out:
3163         if (exp)
3164                 exp_put(exp);
3165         return nfserr;
3166 }
3167
3168 static __be32
3169 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3170                      struct nfsd4_secinfo *secinfo)
3171 {
3172         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3173 }
3174
3175 static __be32
3176 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3177                      struct nfsd4_secinfo_no_name *secinfo)
3178 {
3179         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3180 }
3181
3182 /*
3183  * The SETATTR encode routine is special -- it always encodes a bitmap,
3184  * regardless of the error status.
3185  */
3186 static __be32
3187 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3188 {
3189         __be32 *p;
3190
3191         RESERVE_SPACE(12);
3192         if (nfserr) {
3193                 WRITE32(2);
3194                 WRITE32(0);
3195                 WRITE32(0);
3196         }
3197         else {
3198                 WRITE32(2);
3199                 WRITE32(setattr->sa_bmval[0]);
3200                 WRITE32(setattr->sa_bmval[1]);
3201         }
3202         ADJUST_ARGS();
3203         return nfserr;
3204 }
3205
3206 static __be32
3207 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3208 {
3209         __be32 *p;
3210
3211         if (!nfserr) {
3212                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
3213                 WRITEMEM(&scd->se_clientid, 8);
3214                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
3215                 ADJUST_ARGS();
3216         }
3217         else if (nfserr == nfserr_clid_inuse) {
3218                 RESERVE_SPACE(8);
3219                 WRITE32(0);
3220                 WRITE32(0);
3221                 ADJUST_ARGS();
3222         }
3223         return nfserr;
3224 }
3225
3226 static __be32
3227 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3228 {
3229         __be32 *p;
3230
3231         if (!nfserr) {
3232                 RESERVE_SPACE(16);
3233                 WRITE32(write->wr_bytes_written);
3234                 WRITE32(write->wr_how_written);
3235                 WRITEMEM(write->wr_verifier.data, 8);
3236                 ADJUST_ARGS();
3237         }
3238         return nfserr;
3239 }
3240
3241 static __be32
3242 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3243                          struct nfsd4_exchange_id *exid)
3244 {
3245         __be32 *p;
3246         char *major_id;
3247         char *server_scope;
3248         int major_id_sz;
3249         int server_scope_sz;
3250         uint64_t minor_id = 0;
3251
3252         if (nfserr)
3253                 return nfserr;
3254
3255         major_id = utsname()->nodename;
3256         major_id_sz = strlen(major_id);
3257         server_scope = utsname()->nodename;
3258         server_scope_sz = strlen(server_scope);
3259
3260         RESERVE_SPACE(
3261                 8 /* eir_clientid */ +
3262                 4 /* eir_sequenceid */ +
3263                 4 /* eir_flags */ +
3264                 4 /* spr_how (SP4_NONE) */ +
3265                 8 /* so_minor_id */ +
3266                 4 /* so_major_id.len */ +
3267                 (XDR_QUADLEN(major_id_sz) * 4) +
3268                 4 /* eir_server_scope.len */ +
3269                 (XDR_QUADLEN(server_scope_sz) * 4) +
3270                 4 /* eir_server_impl_id.count (0) */);
3271
3272         WRITEMEM(&exid->clientid, 8);
3273         WRITE32(exid->seqid);
3274         WRITE32(exid->flags);
3275
3276         /* state_protect4_r. Currently only support SP4_NONE */
3277         BUG_ON(exid->spa_how != SP4_NONE);
3278         WRITE32(exid->spa_how);
3279
3280         /* The server_owner struct */
3281         WRITE64(minor_id);      /* Minor id */
3282         /* major id */
3283         WRITE32(major_id_sz);
3284         WRITEMEM(major_id, major_id_sz);
3285
3286         /* Server scope */
3287         WRITE32(server_scope_sz);
3288         WRITEMEM(server_scope, server_scope_sz);
3289
3290         /* Implementation id */
3291         WRITE32(0);     /* zero length nfs_impl_id4 array */
3292         ADJUST_ARGS();
3293         return 0;
3294 }
3295
3296 static __be32
3297 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3298                             struct nfsd4_create_session *sess)
3299 {
3300         __be32 *p;
3301
3302         if (nfserr)
3303                 return nfserr;
3304
3305         RESERVE_SPACE(24);
3306         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3307         WRITE32(sess->seqid);
3308         WRITE32(sess->flags);
3309         ADJUST_ARGS();
3310
3311         RESERVE_SPACE(28);
3312         WRITE32(0); /* headerpadsz */
3313         WRITE32(sess->fore_channel.maxreq_sz);
3314         WRITE32(sess->fore_channel.maxresp_sz);
3315         WRITE32(sess->fore_channel.maxresp_cached);
3316         WRITE32(sess->fore_channel.maxops);
3317         WRITE32(sess->fore_channel.maxreqs);
3318         WRITE32(sess->fore_channel.nr_rdma_attrs);
3319         ADJUST_ARGS();
3320
3321         if (sess->fore_channel.nr_rdma_attrs) {
3322                 RESERVE_SPACE(4);
3323                 WRITE32(sess->fore_channel.rdma_attrs);
3324                 ADJUST_ARGS();
3325         }
3326
3327         RESERVE_SPACE(28);
3328         WRITE32(0); /* headerpadsz */
3329         WRITE32(sess->back_channel.maxreq_sz);
3330         WRITE32(sess->back_channel.maxresp_sz);
3331         WRITE32(sess->back_channel.maxresp_cached);
3332         WRITE32(sess->back_channel.maxops);
3333         WRITE32(sess->back_channel.maxreqs);
3334         WRITE32(sess->back_channel.nr_rdma_attrs);
3335         ADJUST_ARGS();
3336
3337         if (sess->back_channel.nr_rdma_attrs) {
3338                 RESERVE_SPACE(4);
3339                 WRITE32(sess->back_channel.rdma_attrs);
3340                 ADJUST_ARGS();
3341         }
3342         return 0;
3343 }
3344
3345 static __be32
3346 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3347                              struct nfsd4_destroy_session *destroy_session)
3348 {
3349         return nfserr;
3350 }
3351
3352 static __be32
3353 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, int nfserr,
3354                           struct nfsd4_free_stateid *free_stateid)
3355 {
3356         __be32 *p;
3357
3358         if (nfserr)
3359                 return nfserr;
3360
3361         RESERVE_SPACE(4);
3362         WRITE32(nfserr);
3363         ADJUST_ARGS();
3364         return nfserr;
3365 }
3366
3367 static __be32
3368 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3369                       struct nfsd4_sequence *seq)
3370 {
3371         __be32 *p;
3372
3373         if (nfserr)
3374                 return nfserr;
3375
3376         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3377         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3378         WRITE32(seq->seqid);
3379         WRITE32(seq->slotid);
3380         /* Note slotid's are numbered from zero: */
3381         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3382         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3383         WRITE32(seq->status_flags);
3384
3385         ADJUST_ARGS();
3386         resp->cstate.datap = p; /* DRC cache data pointer */
3387         return 0;
3388 }
3389
3390 __be32
3391 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, int nfserr,
3392                           struct nfsd4_test_stateid *test_stateid)
3393 {
3394         struct nfsd4_compoundargs *argp;
3395         struct nfs4_client *cl = resp->cstate.session->se_client;
3396         stateid_t si;
3397         __be32 *p;
3398         int i;
3399         int valid;
3400
3401         restore_buf(test_stateid->ts_saved_args, &test_stateid->ts_savedp);
3402         argp = test_stateid->ts_saved_args;
3403
3404         RESERVE_SPACE(4);
3405         *p++ = htonl(test_stateid->ts_num_ids);
3406         resp->p = p;
3407
3408         nfs4_lock_state();
3409         for (i = 0; i < test_stateid->ts_num_ids; i++) {
3410                 nfsd4_decode_stateid(argp, &si);
3411                 valid = nfs4_validate_stateid(cl, &si);
3412                 RESERVE_SPACE(4);
3413                 *p++ = htonl(valid);
3414                 resp->p = p;
3415         }
3416         nfs4_unlock_state();
3417
3418         return nfserr;
3419 }
3420
3421 static __be32
3422 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3423 {
3424         return nfserr;
3425 }
3426
3427 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3428
3429 /*
3430  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3431  * since we don't need to filter out obsolete ops as this is
3432  * done in the decoding phase.
3433  */
3434 static nfsd4_enc nfsd4_enc_ops[] = {
3435         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3436         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3437         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3438         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3439         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3440         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3441         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3442         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3443         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3444         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3445         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3446         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3447         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3448         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3449         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3450         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3451         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3452         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3453         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3454         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3455         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3456         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3457         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3458         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3459         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3460         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3461         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3462         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3463         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3464         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3465         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3466         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3467         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3468         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3469         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3470         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3471         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3472
3473         /* NFSv4.1 operations */
3474         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3475         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3476         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3477         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3478         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3479         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3480         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3481         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3482         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3483         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3484         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3485         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3486         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3487         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3488         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3489         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3490         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3491         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3492         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3493 };
3494
3495 /*
3496  * Calculate the total amount of memory that the compound response has taken
3497  * after encoding the current operation with pad.
3498  *
3499  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3500  *      which was specified at nfsd4_operation, else pad is zero.
3501  *
3502  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3503  *
3504  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3505  * will be at least a page and will therefore hold the xdr_buf head.
3506  */
3507 int nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3508 {
3509         struct xdr_buf *xb = &resp->rqstp->rq_res;
3510         struct nfsd4_session *session = NULL;
3511         struct nfsd4_slot *slot = resp->cstate.slot;
3512         u32 length, tlen = 0;
3513
3514         if (!nfsd4_has_session(&resp->cstate))
3515                 return 0;
3516
3517         session = resp->cstate.session;
3518         if (session == NULL)
3519                 return 0;
3520
3521         if (xb->page_len == 0) {
3522                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3523         } else {
3524                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3525                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3526
3527                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3528         }
3529         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3530                 length, xb->page_len, tlen, pad);
3531
3532         if (length > session->se_fchannel.maxresp_sz)
3533                 return nfserr_rep_too_big;
3534
3535         if (slot->sl_cachethis == 1 &&
3536             length > session->se_fchannel.maxresp_cached)
3537                 return nfserr_rep_too_big_to_cache;
3538
3539         return 0;
3540 }
3541
3542 void
3543 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3544 {
3545         __be32 *statp;
3546         __be32 *p;
3547
3548         RESERVE_SPACE(8);
3549         WRITE32(op->opnum);
3550         statp = p++;    /* to be backfilled at the end */
3551         ADJUST_ARGS();
3552
3553         if (op->opnum == OP_ILLEGAL)
3554                 goto status;
3555         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3556                !nfsd4_enc_ops[op->opnum]);
3557         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3558         /* nfsd4_check_drc_limit guarantees enough room for error status */
3559         if (!op->status)
3560                 op->status = nfsd4_check_resp_size(resp, 0);
3561 status:
3562         /*
3563          * Note: We write the status directly, instead of using WRITE32(),
3564          * since it is already in network byte order.
3565          */
3566         *statp = op->status;
3567 }
3568
3569 /*
3570  * Encode the reply stored in the stateowner reply cache
3571  *
3572  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3573  * previously sent already encoded operation.
3574  *
3575  * called with nfs4_lock_state() held
3576  */
3577 void
3578 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3579 {
3580         __be32 *p;
3581         struct nfs4_replay *rp = op->replay;
3582
3583         BUG_ON(!rp);
3584
3585         RESERVE_SPACE(8);
3586         WRITE32(op->opnum);
3587         *p++ = rp->rp_status;  /* already xdr'ed */
3588         ADJUST_ARGS();
3589
3590         RESERVE_SPACE(rp->rp_buflen);
3591         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3592         ADJUST_ARGS();
3593 }
3594
3595 int
3596 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3597 {
3598         return xdr_ressize_check(rqstp, p);
3599 }
3600
3601 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3602 {
3603         struct svc_rqst *rqstp = rq;
3604         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3605
3606         if (args->ops != args->iops) {
3607                 kfree(args->ops);
3608                 args->ops = args->iops;
3609         }
3610         kfree(args->tmpp);
3611         args->tmpp = NULL;
3612         while (args->to_free) {
3613                 struct tmpbuf *tb = args->to_free;
3614                 args->to_free = tb->next;
3615                 tb->release(tb->buf);
3616                 kfree(tb);
3617         }
3618         return 1;
3619 }
3620
3621 int
3622 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3623 {
3624         args->p = p;
3625         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3626         args->pagelist = rqstp->rq_arg.pages;
3627         args->pagelen = rqstp->rq_arg.page_len;
3628         args->tmpp = NULL;
3629         args->to_free = NULL;
3630         args->ops = args->iops;
3631         args->rqstp = rqstp;
3632
3633         return !nfsd4_decode_compound(args);
3634 }
3635
3636 int
3637 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3638 {
3639         /*
3640          * All that remains is to write the tag and operation count...
3641          */
3642         struct nfsd4_compound_state *cs = &resp->cstate;
3643         struct kvec *iov;
3644         p = resp->tagp;
3645         *p++ = htonl(resp->taglen);
3646         memcpy(p, resp->tag, resp->taglen);
3647         p += XDR_QUADLEN(resp->taglen);
3648         *p++ = htonl(resp->opcnt);
3649
3650         if (rqstp->rq_res.page_len)
3651                 iov = &rqstp->rq_res.tail[0];
3652         else
3653                 iov = &rqstp->rq_res.head[0];
3654         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3655         BUG_ON(iov->iov_len > PAGE_SIZE);
3656         if (nfsd4_has_session(cs)) {
3657                 if (cs->status != nfserr_replay_cache) {
3658                         nfsd4_store_cache_entry(resp);
3659                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3660                         cs->slot->sl_inuse = false;
3661                 }
3662                 /* Renew the clientid on success and on replay */
3663                 release_session_client(cs->session);
3664                 nfsd4_put_session(cs->session);
3665         }
3666         return 1;
3667 }
3668
3669 /*
3670  * Local variables:
3671  *  c-basic-offset: 8
3672  * End:
3673  */