fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/slab.h>
  44 #include <linux/namei.h>
  45 #include <linux/statfs.h>
  46 #include <linux/utsname.h>
  47 #include <linux/pagemap.h>
  48 #include <linux/sunrpc/svcauth_gss.h>
  49
  50 #include "idmap.h"
  51 #include "acl.h"
  52 #include "xdr4.h"
  53 #include "vfs.h"
  54 #include "state.h"
  55 #include "cache.h"
  56
  57 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  58
  59 /*
  60  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  61  * directory in order to indicate to the client that a filesystem boundary is present
  62  * We use a fixed fsid for a referral
  63  */
  64 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  65 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  66
  67 static __be32
  68 check_filename(char *str, int len, __be32 err)
  69 {
  70         int i;
  71
  72         if (len == 0)
  73                 return nfserr_inval;
  74         if (isdotent(str, len))
  75                 return err;
  76         for (i = 0; i < len; i++)
  77                 if (str[i] == '/')
  78                         return err;
  79         return 0;
  80 }
  81
  82 #define DECODE_HEAD                             \
  83         __be32 *p;                              \
  84         __be32 status
  85 #define DECODE_TAIL                             \
  86         status = 0;                             \
  87 out:                                            \
  88         return status;                          \
  89 xdr_error:                                      \
  90         dprintk("NFSD: xdr error (%s:%d)\n",    \
  91                         __FILE__, __LINE__);    \
  92         status = nfserr_bad_xdr;                \
  93         goto out
  94
  95 #define READ32(x)         (x) = ntohl(*p++)
  96 #define READ64(x)         do {                  \
  97         (x) = (u64)ntohl(*p++) << 32;           \
  98         (x) |= ntohl(*p++);                     \
  99 } while (0)
 100 #define READTIME(x)       do {                  \
 101         p++;                                    \
 102         (x) = ntohl(*p++);                      \
 103         p++;                                    \
 104 } while (0)
 105 #define READMEM(x,nbytes) do {                  \
 106         x = (char *)p;                          \
 107         p += XDR_QUADLEN(nbytes);               \
 108 } while (0)
 109 #define SAVEMEM(x,nbytes) do {                  \
 110         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 111                 savemem(argp, p, nbytes) :      \
 112                 (char *)p)) {                   \
 113                 dprintk("NFSD: xdr error (%s:%d)\n", \
 114                                 __FILE__, __LINE__); \
 115                 goto xdr_error;                 \
 116                 }                               \
 117         p += XDR_QUADLEN(nbytes);               \
 118 } while (0)
 119 #define COPYMEM(x,nbytes) do {                  \
 120         memcpy((x), p, nbytes);                 \
 121         p += XDR_QUADLEN(nbytes);               \
 122 } while (0)
 123
 124 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 125 #define READ_BUF(nbytes)  do {                  \
 126         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 127                 p = argp->p;                    \
 128                 argp->p += XDR_QUADLEN(nbytes); \
 129         } else if (!(p = read_buf(argp, nbytes))) { \
 130                 dprintk("NFSD: xdr error (%s:%d)\n", \
 131                                 __FILE__, __LINE__); \
 132                 goto xdr_error;                 \
 133         }                                       \
 134 } while (0)
 135
 136 static void save_buf(struct nfsd4_compoundargs *argp, struct nfsd4_saved_compoundargs *savep)
 137 {
 138         savep->p        = argp->p;
 139         savep->end      = argp->end;
 140         savep->pagelen  = argp->pagelen;
 141         savep->pagelist = argp->pagelist;
 142 }
 143
 144 static void restore_buf(struct nfsd4_compoundargs *argp, struct nfsd4_saved_compoundargs *savep)
 145 {
 146         argp->p        = savep->p;
 147         argp->end      = savep->end;
 148         argp->pagelen  = savep->pagelen;
 149         argp->pagelist = savep->pagelist;
 150 }
 151
 152 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 153 {
 154         /* We want more bytes than seem to be available.
 155          * Maybe we need a new page, maybe we have just run out
 156          */
 157         unsigned int avail = (char *)argp->end - (char *)argp->p;
 158         __be32 *p;
 159         if (avail + argp->pagelen < nbytes)
 160                 return NULL;
 161         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 162                 return NULL;
 163         /* ok, we can do it with the current plus the next page */
 164         if (nbytes <= sizeof(argp->tmp))
 165                 p = argp->tmp;
 166         else {
 167                 kfree(argp->tmpp);
 168                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 169                 if (!p)
 170                         return NULL;
 171
 172         }
 173         /*
 174          * The following memcpy is safe because read_buf is always
 175          * called with nbytes > avail, and the two cases above both
 176          * guarantee p points to at least nbytes bytes.
 177          */
 178         memcpy(p, argp->p, avail);
 179         /* step to next page */
 180         argp->p = page_address(argp->pagelist[0]);
 181         argp->pagelist++;
 182         if (argp->pagelen < PAGE_SIZE) {
 183                 argp->end = argp->p + (argp->pagelen>>2);
 184                 argp->pagelen = 0;
 185         } else {
 186                 argp->end = argp->p + (PAGE_SIZE>>2);
 187                 argp->pagelen -= PAGE_SIZE;
 188         }
 189         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 190         argp->p += XDR_QUADLEN(nbytes - avail);
 191         return p;
 192 }
 193
 194 static int zero_clientid(clientid_t *clid)
 195 {
 196         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 197 }
 198
 199 static int
 200 defer_free(struct nfsd4_compoundargs *argp,
 201                 void (*release)(const void *), void *p)
 202 {
 203         struct tmpbuf *tb;
 204
 205         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 206         if (!tb)
 207                 return -ENOMEM;
 208         tb->buf = p;
 209         tb->release = release;
 210         tb->next = argp->to_free;
 211         argp->to_free = tb;
 212         return 0;
 213 }
 214
 215 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 216 {
 217         if (p == argp->tmp) {
 218                 p = kmalloc(nbytes, GFP_KERNEL);
 219                 if (!p)
 220                         return NULL;
 221                 memcpy(p, argp->tmp, nbytes);
 222         } else {
 223                 BUG_ON(p != argp->tmpp);
 224                 argp->tmpp = NULL;
 225         }
 226         if (defer_free(argp, kfree, p)) {
 227                 kfree(p);
 228                 return NULL;
 229         } else
 230                 return (char *)p;
 231 }
 232
 233 static __be32
 234 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 235 {
 236         u32 bmlen;
 237         DECODE_HEAD;
 238
 239         bmval[0] = 0;
 240         bmval[1] = 0;
 241         bmval[2] = 0;
 242
 243         READ_BUF(4);
 244         READ32(bmlen);
 245         if (bmlen > 1000)
 246                 goto xdr_error;
 247
 248         READ_BUF(bmlen << 2);
 249         if (bmlen > 0)
 250                 READ32(bmval[0]);
 251         if (bmlen > 1)
 252                 READ32(bmval[1]);
 253         if (bmlen > 2)
 254                 READ32(bmval[2]);
 255
 256         DECODE_TAIL;
 257 }
 258
 259 static __be32
 260 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 261                    struct iattr *iattr, struct nfs4_acl **acl)
 262 {
 263         int expected_len, len = 0;
 264         u32 dummy32;
 265         char *buf;
 266         int host_err;
 267
 268         DECODE_HEAD;
 269         iattr->ia_valid = 0;
 270         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 271                 return status;
 272
 273         READ_BUF(4);
 274         READ32(expected_len);
 275
 276         if (bmval[0] & FATTR4_WORD0_SIZE) {
 277                 READ_BUF(8);
 278                 len += 8;
 279                 READ64(iattr->ia_size);
 280                 iattr->ia_valid |= ATTR_SIZE;
 281         }
 282         if (bmval[0] & FATTR4_WORD0_ACL) {
 283                 int nace;
 284                 struct nfs4_ace *ace;
 285
 286                 READ_BUF(4); len += 4;
 287                 READ32(nace);
 288
 289                 if (nace > NFS4_ACL_MAX)
 290                         return nfserr_resource;
 291
 292                 *acl = nfs4_acl_new(nace);
 293                 if (*acl == NULL) {
 294                         host_err = -ENOMEM;
 295                         goto out_nfserr;
 296                 }
 297                 defer_free(argp, kfree, *acl);
 298
 299                 (*acl)->naces = nace;
 300                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 301                         READ_BUF(16); len += 16;
 302                         READ32(ace->type);
 303                         READ32(ace->flag);
 304                         READ32(ace->access_mask);
 305                         READ32(dummy32);
 306                         READ_BUF(dummy32);
 307                         len += XDR_QUADLEN(dummy32) << 2;
 308                         READMEM(buf, dummy32);
 309                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 310                         status = nfs_ok;
 311                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 312                                 ace->who = 0;
 313                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 314                                 status = nfsd_map_name_to_gid(argp->rqstp,
 315                                                 buf, dummy32, &ace->who);
 316                         else
 317                                 status = nfsd_map_name_to_uid(argp->rqstp,
 318                                                 buf, dummy32, &ace->who);
 319                         if (status)
 320                                 return status;
 321                 }
 322         } else
 323                 *acl = NULL;
 324         if (bmval[1] & FATTR4_WORD1_MODE) {
 325                 READ_BUF(4);
 326                 len += 4;
 327                 READ32(iattr->ia_mode);
 328                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 329                 iattr->ia_valid |= ATTR_MODE;
 330         }
 331         if (bmval[1] & FATTR4_WORD1_OWNER) {
 332                 READ_BUF(4);
 333                 len += 4;
 334                 READ32(dummy32);
 335                 READ_BUF(dummy32);
 336                 len += (XDR_QUADLEN(dummy32) << 2);
 337                 READMEM(buf, dummy32);
 338                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 339                         return status;
 340                 iattr->ia_valid |= ATTR_UID;
 341         }
 342         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 343                 READ_BUF(4);
 344                 len += 4;
 345                 READ32(dummy32);
 346                 READ_BUF(dummy32);
 347                 len += (XDR_QUADLEN(dummy32) << 2);
 348                 READMEM(buf, dummy32);
 349                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 350                         return status;
 351                 iattr->ia_valid |= ATTR_GID;
 352         }
 353         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 354                 READ_BUF(4);
 355                 len += 4;
 356                 READ32(dummy32);
 357                 switch (dummy32) {
 358                 case NFS4_SET_TO_CLIENT_TIME:
 359                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 360                            all 32 bits of 'nseconds'. */
 361                         READ_BUF(12);
 362                         len += 12;
 363                         READ32(dummy32);
 364                         if (dummy32)
 365                                 return nfserr_inval;
 366                         READ32(iattr->ia_atime.tv_sec);
 367                         READ32(iattr->ia_atime.tv_nsec);
 368                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 369                                 return nfserr_inval;
 370                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 371                         break;
 372                 case NFS4_SET_TO_SERVER_TIME:
 373                         iattr->ia_valid |= ATTR_ATIME;
 374                         break;
 375                 default:
 376                         goto xdr_error;
 377                 }
 378         }
 379         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 380                 READ_BUF(4);
 381                 len += 4;
 382                 READ32(dummy32);
 383                 switch (dummy32) {
 384                 case NFS4_SET_TO_CLIENT_TIME:
 385                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 386                            all 32 bits of 'nseconds'. */
 387                         READ_BUF(12);
 388                         len += 12;
 389                         READ32(dummy32);
 390                         if (dummy32)
 391                                 return nfserr_inval;
 392                         READ32(iattr->ia_mtime.tv_sec);
 393                         READ32(iattr->ia_mtime.tv_nsec);
 394                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 395                                 return nfserr_inval;
 396                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 397                         break;
 398                 case NFS4_SET_TO_SERVER_TIME:
 399                         iattr->ia_valid |= ATTR_MTIME;
 400                         break;
 401                 default:
 402                         goto xdr_error;
 403                 }
 404         }
 405         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 406             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 407             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 408                 READ_BUF(expected_len - len);
 409         else if (len != expected_len)
 410                 goto xdr_error;
 411
 412         DECODE_TAIL;
 413
 414 out_nfserr:
 415         status = nfserrno(host_err);
 416         goto out;
 417 }
 418
 419 static __be32
 420 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 421 {
 422         DECODE_HEAD;
 423
 424         READ_BUF(sizeof(stateid_t));
 425         READ32(sid->si_generation);
 426         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 427
 428         DECODE_TAIL;
 429 }
 430
 431 static __be32
 432 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 433 {
 434         DECODE_HEAD;
 435
 436         READ_BUF(4);
 437         READ32(access->ac_req_access);
 438
 439         DECODE_TAIL;
 440 }
 441
 442 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 443 {
 444         DECODE_HEAD;
 445
 446         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 447         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 448         READ32(bcts->dir);
 449         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 450          * could help us figure out we should be using it. */
 451         DECODE_TAIL;
 452 }
 453
 454 static __be32
 455 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 456 {
 457         DECODE_HEAD;
 458
 459         READ_BUF(4);
 460         READ32(close->cl_seqid);
 461         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 462
 463         DECODE_TAIL;
 464 }
 465
 466
 467 static __be32
 468 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 469 {
 470         DECODE_HEAD;
 471
 472         READ_BUF(12);
 473         READ64(commit->co_offset);
 474         READ32(commit->co_count);
 475
 476         DECODE_TAIL;
 477 }
 478
 479 static __be32
 480 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 481 {
 482         DECODE_HEAD;
 483
 484         READ_BUF(4);
 485         READ32(create->cr_type);
 486         switch (create->cr_type) {
 487         case NF4LNK:
 488                 READ_BUF(4);
 489                 READ32(create->cr_linklen);
 490                 READ_BUF(create->cr_linklen);
 491                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 492                 break;
 493         case NF4BLK:
 494         case NF4CHR:
 495                 READ_BUF(8);
 496                 READ32(create->cr_specdata1);
 497                 READ32(create->cr_specdata2);
 498                 break;
 499         case NF4SOCK:
 500         case NF4FIFO:
 501         case NF4DIR:
 502         default:
 503                 break;
 504         }
 505
 506         READ_BUF(4);
 507         READ32(create->cr_namelen);
 508         READ_BUF(create->cr_namelen);
 509         SAVEMEM(create->cr_name, create->cr_namelen);
 510         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 511                 return status;
 512
 513         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 514                                     &create->cr_acl);
 515         if (status)
 516                 goto out;
 517
 518         DECODE_TAIL;
 519 }
 520
 521 static inline __be32
 522 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 523 {
 524         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 525 }
 526
 527 static inline __be32
 528 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 529 {
 530         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 531 }
 532
 533 static __be32
 534 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 535 {
 536         DECODE_HEAD;
 537
 538         READ_BUF(4);
 539         READ32(link->li_namelen);
 540         READ_BUF(link->li_namelen);
 541         SAVEMEM(link->li_name, link->li_namelen);
 542         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 543                 return status;
 544
 545         DECODE_TAIL;
 546 }
 547
 548 static __be32
 549 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 550 {
 551         DECODE_HEAD;
 552
 553         /*
 554         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 555         */
 556         READ_BUF(28);
 557         READ32(lock->lk_type);
 558         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 559                 goto xdr_error;
 560         READ32(lock->lk_reclaim);
 561         READ64(lock->lk_offset);
 562         READ64(lock->lk_length);
 563         READ32(lock->lk_is_new);
 564
 565         if (lock->lk_is_new) {
 566                 READ_BUF(4);
 567                 READ32(lock->lk_new_open_seqid);
 568                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 569                 if (status)
 570                         return status;
 571                 READ_BUF(8 + sizeof(clientid_t));
 572                 READ32(lock->lk_new_lock_seqid);
 573                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 574                 READ32(lock->lk_new_owner.len);
 575                 READ_BUF(lock->lk_new_owner.len);
 576                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 577         } else {
 578                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 579                 if (status)
 580                         return status;
 581                 READ_BUF(4);
 582                 READ32(lock->lk_old_lock_seqid);
 583         }
 584
 585         DECODE_TAIL;
 586 }
 587
 588 static __be32
 589 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 590 {
 591         DECODE_HEAD;
 592
 593         READ_BUF(32);
 594         READ32(lockt->lt_type);
 595         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 596                 goto xdr_error;
 597         READ64(lockt->lt_offset);
 598         READ64(lockt->lt_length);
 599         COPYMEM(&lockt->lt_clientid, 8);
 600         READ32(lockt->lt_owner.len);
 601         READ_BUF(lockt->lt_owner.len);
 602         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 603
 604         DECODE_TAIL;
 605 }
 606
 607 static __be32
 608 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 609 {
 610         DECODE_HEAD;
 611
 612         READ_BUF(8);
 613         READ32(locku->lu_type);
 614         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 615                 goto xdr_error;
 616         READ32(locku->lu_seqid);
 617         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 618         if (status)
 619                 return status;
 620         READ_BUF(16);
 621         READ64(locku->lu_offset);
 622         READ64(locku->lu_length);
 623
 624         DECODE_TAIL;
 625 }
 626
 627 static __be32
 628 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 629 {
 630         DECODE_HEAD;
 631
 632         READ_BUF(4);
 633         READ32(lookup->lo_len);
 634         READ_BUF(lookup->lo_len);
 635         SAVEMEM(lookup->lo_name, lookup->lo_len);
 636         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 637                 return status;
 638
 639         DECODE_TAIL;
 640 }
 641
 642 static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *x)
 643 {
 644         __be32 *p;
 645         u32 w;
 646
 647         READ_BUF(4);
 648         READ32(w);
 649         *x = w;
 650         switch (w & NFS4_SHARE_ACCESS_MASK) {
 651         case NFS4_SHARE_ACCESS_READ:
 652         case NFS4_SHARE_ACCESS_WRITE:
 653         case NFS4_SHARE_ACCESS_BOTH:
 654                 break;
 655         default:
 656                 return nfserr_bad_xdr;
 657         }
 658         w &= !NFS4_SHARE_ACCESS_MASK;
 659         if (!w)
 660                 return nfs_ok;
 661         if (!argp->minorversion)
 662                 return nfserr_bad_xdr;
 663         switch (w & NFS4_SHARE_WANT_MASK) {
 664         case NFS4_SHARE_WANT_NO_PREFERENCE:
 665         case NFS4_SHARE_WANT_READ_DELEG:
 666         case NFS4_SHARE_WANT_WRITE_DELEG:
 667         case NFS4_SHARE_WANT_ANY_DELEG:
 668         case NFS4_SHARE_WANT_NO_DELEG:
 669         case NFS4_SHARE_WANT_CANCEL:
 670                 break;
 671         default:
 672                 return nfserr_bad_xdr;
 673         }
 674         w &= !NFS4_SHARE_WANT_MASK;
 675         if (!w)
 676                 return nfs_ok;
 677         switch (w) {
 678         case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 679         case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 680                 return nfs_ok;
 681         }
 682 xdr_error:
 683         return nfserr_bad_xdr;
 684 }
 685
 686 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 687 {
 688         __be32 *p;
 689
 690         READ_BUF(4);
 691         READ32(*x);
 692         /* Note: unlinke access bits, deny bits may be zero. */
 693         if (*x & ~NFS4_SHARE_DENY_BOTH)
 694                 return nfserr_bad_xdr;
 695         return nfs_ok;
 696 xdr_error:
 697         return nfserr_bad_xdr;
 698 }
 699
 700 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 701 {
 702         __be32 *p;
 703
 704         READ_BUF(4);
 705         READ32(o->len);
 706
 707         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 708                 return nfserr_bad_xdr;
 709
 710         READ_BUF(o->len);
 711         SAVEMEM(o->data, o->len);
 712         return nfs_ok;
 713 xdr_error:
 714         return nfserr_bad_xdr;
 715 }
 716
 717 static __be32
 718 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 719 {
 720         DECODE_HEAD;
 721
 722         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 723         open->op_iattr.ia_valid = 0;
 724         open->op_openowner = NULL;
 725
 726         /* seqid, share_access, share_deny, clientid, ownerlen */
 727         READ_BUF(4);
 728         READ32(open->op_seqid);
 729         status = nfsd4_decode_share_access(argp, &open->op_share_access);
 730         if (status)
 731                 goto xdr_error;
 732         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 733         if (status)
 734                 goto xdr_error;
 735         READ_BUF(sizeof(clientid_t));
 736         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 737         status = nfsd4_decode_opaque(argp, &open->op_owner);
 738         if (status)
 739                 goto xdr_error;
 740         READ_BUF(4);
 741         READ32(open->op_create);
 742         switch (open->op_create) {
 743         case NFS4_OPEN_NOCREATE:
 744                 break;
 745         case NFS4_OPEN_CREATE:
 746                 READ_BUF(4);
 747                 READ32(open->op_createmode);
 748                 switch (open->op_createmode) {
 749                 case NFS4_CREATE_UNCHECKED:
 750                 case NFS4_CREATE_GUARDED:
 751                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 752                                 &open->op_iattr, &open->op_acl);
 753                         if (status)
 754                                 goto out;
 755                         break;
 756                 case NFS4_CREATE_EXCLUSIVE:
 757                         READ_BUF(8);
 758                         COPYMEM(open->op_verf.data, 8);
 759                         break;
 760                 case NFS4_CREATE_EXCLUSIVE4_1:
 761                         if (argp->minorversion < 1)
 762                                 goto xdr_error;
 763                         READ_BUF(8);
 764                         COPYMEM(open->op_verf.data, 8);
 765                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 766                                 &open->op_iattr, &open->op_acl);
 767                         if (status)
 768                                 goto out;
 769                         break;
 770                 default:
 771                         goto xdr_error;
 772                 }
 773                 break;
 774         default:
 775                 goto xdr_error;
 776         }
 777
 778         /* open_claim */
 779         READ_BUF(4);
 780         READ32(open->op_claim_type);
 781         switch (open->op_claim_type) {
 782         case NFS4_OPEN_CLAIM_NULL:
 783         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 784                 READ_BUF(4);
 785                 READ32(open->op_fname.len);
 786                 READ_BUF(open->op_fname.len);
 787                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 788                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 789                         return status;
 790                 break;
 791         case NFS4_OPEN_CLAIM_PREVIOUS:
 792                 READ_BUF(4);
 793                 READ32(open->op_delegate_type);
 794                 break;
 795         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 796                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 797                 if (status)
 798                         return status;
 799                 READ_BUF(4);
 800                 READ32(open->op_fname.len);
 801                 READ_BUF(open->op_fname.len);
 802                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 803                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 804                         return status;
 805                 break;
 806         default:
 807                 goto xdr_error;
 808         }
 809
 810         DECODE_TAIL;
 811 }
 812
 813 static __be32
 814 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 815 {
 816         DECODE_HEAD;
 817
 818         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 819         if (status)
 820                 return status;
 821         READ_BUF(4);
 822         READ32(open_conf->oc_seqid);
 823
 824         DECODE_TAIL;
 825 }
 826
 827 static __be32
 828 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 829 {
 830         DECODE_HEAD;
 831
 832         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 833         if (status)
 834                 return status;
 835         READ_BUF(4);
 836         READ32(open_down->od_seqid);
 837         status = nfsd4_decode_share_access(argp, &open_down->od_share_access);
 838         if (status)
 839                 return status;
 840         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 841         if (status)
 842                 return status;
 843         DECODE_TAIL;
 844 }
 845
 846 static __be32
 847 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 848 {
 849         DECODE_HEAD;
 850
 851         READ_BUF(4);
 852         READ32(putfh->pf_fhlen);
 853         if (putfh->pf_fhlen > NFS4_FHSIZE)
 854                 goto xdr_error;
 855         READ_BUF(putfh->pf_fhlen);
 856         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 857
 858         DECODE_TAIL;
 859 }
 860
 861 static __be32
 862 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 863 {
 864         DECODE_HEAD;
 865
 866         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 867         if (status)
 868                 return status;
 869         READ_BUF(12);
 870         READ64(read->rd_offset);
 871         READ32(read->rd_length);
 872
 873         DECODE_TAIL;
 874 }
 875
 876 static __be32
 877 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 878 {
 879         DECODE_HEAD;
 880
 881         READ_BUF(24);
 882         READ64(readdir->rd_cookie);
 883         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 884         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 885         READ32(readdir->rd_maxcount);
 886         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 887                 goto out;
 888
 889         DECODE_TAIL;
 890 }
 891
 892 static __be32
 893 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 894 {
 895         DECODE_HEAD;
 896
 897         READ_BUF(4);
 898         READ32(remove->rm_namelen);
 899         READ_BUF(remove->rm_namelen);
 900         SAVEMEM(remove->rm_name, remove->rm_namelen);
 901         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 902                 return status;
 903
 904         DECODE_TAIL;
 905 }
 906
 907 static __be32
 908 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 909 {
 910         DECODE_HEAD;
 911
 912         READ_BUF(4);
 913         READ32(rename->rn_snamelen);
 914         READ_BUF(rename->rn_snamelen + 4);
 915         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 916         READ32(rename->rn_tnamelen);
 917         READ_BUF(rename->rn_tnamelen);
 918         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 919         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 920                 return status;
 921         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 922                 return status;
 923
 924         DECODE_TAIL;
 925 }
 926
 927 static __be32
 928 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 929 {
 930         DECODE_HEAD;
 931
 932         READ_BUF(sizeof(clientid_t));
 933         COPYMEM(clientid, sizeof(clientid_t));
 934
 935         DECODE_TAIL;
 936 }
 937
 938 static __be32
 939 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 940                      struct nfsd4_secinfo *secinfo)
 941 {
 942         DECODE_HEAD;
 943
 944         READ_BUF(4);
 945         READ32(secinfo->si_namelen);
 946         READ_BUF(secinfo->si_namelen);
 947         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 948         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 949                                                                 nfserr_noent);
 950         if (status)
 951                 return status;
 952         DECODE_TAIL;
 953 }
 954
 955 static __be32
 956 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
 957                      struct nfsd4_secinfo_no_name *sin)
 958 {
 959         DECODE_HEAD;
 960
 961         READ_BUF(4);
 962         READ32(sin->sin_style);
 963         DECODE_TAIL;
 964 }
 965
 966 static __be32
 967 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 968 {
 969         __be32 status;
 970
 971         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 972         if (status)
 973                 return status;
 974         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 975                                   &setattr->sa_acl);
 976 }
 977
 978 static __be32
 979 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 980 {
 981         DECODE_HEAD;
 982
 983         READ_BUF(8);
 984         COPYMEM(setclientid->se_verf.data, 8);
 985
 986         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
 987         if (status)
 988                 return nfserr_bad_xdr;
 989         READ_BUF(8);
 990         READ32(setclientid->se_callback_prog);
 991         READ32(setclientid->se_callback_netid_len);
 992
 993         READ_BUF(setclientid->se_callback_netid_len + 4);
 994         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 995         READ32(setclientid->se_callback_addr_len);
 996
 997         READ_BUF(setclientid->se_callback_addr_len + 4);
 998         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 999         READ32(setclientid->se_callback_ident);
1000
1001         DECODE_TAIL;
1002 }
1003
1004 static __be32
1005 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1006 {
1007         DECODE_HEAD;
1008
1009         READ_BUF(8 + sizeof(nfs4_verifier));
1010         COPYMEM(&scd_c->sc_clientid, 8);
1011         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
1012
1013         DECODE_TAIL;
1014 }
1015
1016 /* Also used for NVERIFY */
1017 static __be32
1018 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1019 {
1020 #if 0
1021         struct nfsd4_compoundargs save = {
1022                 .p = argp->p,
1023                 .end = argp->end,
1024                 .rqstp = argp->rqstp,
1025         };
1026         u32             ve_bmval[2];
1027         struct iattr    ve_iattr;           /* request */
1028         struct nfs4_acl *ve_acl;            /* request */
1029 #endif
1030         DECODE_HEAD;
1031
1032         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1033                 goto out;
1034
1035         /* For convenience's sake, we compare raw xdr'd attributes in
1036          * nfsd4_proc_verify; however we still decode here just to return
1037          * correct error in case of bad xdr. */
1038 #if 0
1039         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1040         if (status == nfserr_inval) {
1041                 status = nfserrno(status);
1042                 goto out;
1043         }
1044 #endif
1045         READ_BUF(4);
1046         READ32(verify->ve_attrlen);
1047         READ_BUF(verify->ve_attrlen);
1048         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1049
1050         DECODE_TAIL;
1051 }
1052
1053 static __be32
1054 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1055 {
1056         int avail;
1057         int v;
1058         int len;
1059         DECODE_HEAD;
1060
1061         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1062         if (status)
1063                 return status;
1064         READ_BUF(16);
1065         READ64(write->wr_offset);
1066         READ32(write->wr_stable_how);
1067         if (write->wr_stable_how > 2)
1068                 goto xdr_error;
1069         READ32(write->wr_buflen);
1070
1071         /* Sorry .. no magic macros for this.. *
1072          * READ_BUF(write->wr_buflen);
1073          * SAVEMEM(write->wr_buf, write->wr_buflen);
1074          */
1075         avail = (char*)argp->end - (char*)argp->p;
1076         if (avail + argp->pagelen < write->wr_buflen) {
1077                 dprintk("NFSD: xdr error (%s:%d)\n",
1078                                 __FILE__, __LINE__);
1079                 goto xdr_error;
1080         }
1081         argp->rqstp->rq_vec[0].iov_base = p;
1082         argp->rqstp->rq_vec[0].iov_len = avail;
1083         v = 0;
1084         len = write->wr_buflen;
1085         while (len > argp->rqstp->rq_vec[v].iov_len) {
1086                 len -= argp->rqstp->rq_vec[v].iov_len;
1087                 v++;
1088                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
1089                 argp->pagelist++;
1090                 if (argp->pagelen >= PAGE_SIZE) {
1091                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1092                         argp->pagelen -= PAGE_SIZE;
1093                 } else {
1094                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1095                         argp->pagelen -= len;
1096                 }
1097         }
1098         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1099         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1100         argp->rqstp->rq_vec[v].iov_len = len;
1101         write->wr_vlen = v+1;
1102
1103         DECODE_TAIL;
1104 }
1105
1106 static __be32
1107 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1108 {
1109         DECODE_HEAD;
1110
1111         READ_BUF(12);
1112         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1113         READ32(rlockowner->rl_owner.len);
1114         READ_BUF(rlockowner->rl_owner.len);
1115         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1116
1117         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1118                 return nfserr_inval;
1119         DECODE_TAIL;
1120 }
1121
1122 static __be32
1123 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1124                          struct nfsd4_exchange_id *exid)
1125 {
1126         int dummy, tmp;
1127         DECODE_HEAD;
1128
1129         READ_BUF(NFS4_VERIFIER_SIZE);
1130         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1131
1132         status = nfsd4_decode_opaque(argp, &exid->clname);
1133         if (status)
1134                 return nfserr_bad_xdr;
1135
1136         READ_BUF(4);
1137         READ32(exid->flags);
1138
1139         /* Ignore state_protect4_a */
1140         READ_BUF(4);
1141         READ32(exid->spa_how);
1142         switch (exid->spa_how) {
1143         case SP4_NONE:
1144                 break;
1145         case SP4_MACH_CRED:
1146                 /* spo_must_enforce */
1147                 READ_BUF(4);
1148                 READ32(dummy);
1149                 READ_BUF(dummy * 4);
1150                 p += dummy;
1151
1152                 /* spo_must_allow */
1153                 READ_BUF(4);
1154                 READ32(dummy);
1155                 READ_BUF(dummy * 4);
1156                 p += dummy;
1157                 break;
1158         case SP4_SSV:
1159                 /* ssp_ops */
1160                 READ_BUF(4);
1161                 READ32(dummy);
1162                 READ_BUF(dummy * 4);
1163                 p += dummy;
1164
1165                 READ_BUF(4);
1166                 READ32(dummy);
1167                 READ_BUF(dummy * 4);
1168                 p += dummy;
1169
1170                 /* ssp_hash_algs<> */
1171                 READ_BUF(4);
1172                 READ32(tmp);
1173                 while (tmp--) {
1174                         READ_BUF(4);
1175                         READ32(dummy);
1176                         READ_BUF(dummy);
1177                         p += XDR_QUADLEN(dummy);
1178                 }
1179
1180                 /* ssp_encr_algs<> */
1181                 READ_BUF(4);
1182                 READ32(tmp);
1183                 while (tmp--) {
1184                         READ_BUF(4);
1185                         READ32(dummy);
1186                         READ_BUF(dummy);
1187                         p += XDR_QUADLEN(dummy);
1188                 }
1189
1190                 /* ssp_window and ssp_num_gss_handles */
1191                 READ_BUF(8);
1192                 READ32(dummy);
1193                 READ32(dummy);
1194                 break;
1195         default:
1196                 goto xdr_error;
1197         }
1198
1199         /* Ignore Implementation ID */
1200         READ_BUF(4);    /* nfs_impl_id4 array length */
1201         READ32(dummy);
1202
1203         if (dummy > 1)
1204                 goto xdr_error;
1205
1206         if (dummy == 1) {
1207                 /* nii_domain */
1208                 READ_BUF(4);
1209                 READ32(dummy);
1210                 READ_BUF(dummy);
1211                 p += XDR_QUADLEN(dummy);
1212
1213                 /* nii_name */
1214                 READ_BUF(4);
1215                 READ32(dummy);
1216                 READ_BUF(dummy);
1217                 p += XDR_QUADLEN(dummy);
1218
1219                 /* nii_date */
1220                 READ_BUF(12);
1221                 p += 3;
1222         }
1223         DECODE_TAIL;
1224 }
1225
1226 static __be32
1227 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1228                             struct nfsd4_create_session *sess)
1229 {
1230         DECODE_HEAD;
1231
1232         u32 dummy;
1233         char *machine_name;
1234         int i;
1235         int nr_secflavs;
1236
1237         READ_BUF(16);
1238         COPYMEM(&sess->clientid, 8);
1239         READ32(sess->seqid);
1240         READ32(sess->flags);
1241
1242         /* Fore channel attrs */
1243         READ_BUF(28);
1244         READ32(dummy); /* headerpadsz is always 0 */
1245         READ32(sess->fore_channel.maxreq_sz);
1246         READ32(sess->fore_channel.maxresp_sz);
1247         READ32(sess->fore_channel.maxresp_cached);
1248         READ32(sess->fore_channel.maxops);
1249         READ32(sess->fore_channel.maxreqs);
1250         READ32(sess->fore_channel.nr_rdma_attrs);
1251         if (sess->fore_channel.nr_rdma_attrs == 1) {
1252                 READ_BUF(4);
1253                 READ32(sess->fore_channel.rdma_attrs);
1254         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1255                 dprintk("Too many fore channel attr bitmaps!\n");
1256                 goto xdr_error;
1257         }
1258
1259         /* Back channel attrs */
1260         READ_BUF(28);
1261         READ32(dummy); /* headerpadsz is always 0 */
1262         READ32(sess->back_channel.maxreq_sz);
1263         READ32(sess->back_channel.maxresp_sz);
1264         READ32(sess->back_channel.maxresp_cached);
1265         READ32(sess->back_channel.maxops);
1266         READ32(sess->back_channel.maxreqs);
1267         READ32(sess->back_channel.nr_rdma_attrs);
1268         if (sess->back_channel.nr_rdma_attrs == 1) {
1269                 READ_BUF(4);
1270                 READ32(sess->back_channel.rdma_attrs);
1271         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1272                 dprintk("Too many back channel attr bitmaps!\n");
1273                 goto xdr_error;
1274         }
1275
1276         READ_BUF(8);
1277         READ32(sess->callback_prog);
1278
1279         /* callback_sec_params4 */
1280         READ32(nr_secflavs);
1281         for (i = 0; i < nr_secflavs; ++i) {
1282                 READ_BUF(4);
1283                 READ32(dummy);
1284                 switch (dummy) {
1285                 case RPC_AUTH_NULL:
1286                         /* Nothing to read */
1287                         break;
1288                 case RPC_AUTH_UNIX:
1289                         READ_BUF(8);
1290                         /* stamp */
1291                         READ32(dummy);
1292
1293                         /* machine name */
1294                         READ32(dummy);
1295                         READ_BUF(dummy);
1296                         SAVEMEM(machine_name, dummy);
1297
1298                         /* uid, gid */
1299                         READ_BUF(8);
1300                         READ32(sess->uid);
1301                         READ32(sess->gid);
1302
1303                         /* more gids */
1304                         READ_BUF(4);
1305                         READ32(dummy);
1306                         READ_BUF(dummy * 4);
1307                         break;
1308                 case RPC_AUTH_GSS:
1309                         dprintk("RPC_AUTH_GSS callback secflavor "
1310                                 "not supported!\n");
1311                         READ_BUF(8);
1312                         /* gcbp_service */
1313                         READ32(dummy);
1314                         /* gcbp_handle_from_server */
1315                         READ32(dummy);
1316                         READ_BUF(dummy);
1317                         p += XDR_QUADLEN(dummy);
1318                         /* gcbp_handle_from_client */
1319                         READ_BUF(4);
1320                         READ32(dummy);
1321                         READ_BUF(dummy);
1322                         break;
1323                 default:
1324                         dprintk("Illegal callback secflavor\n");
1325                         return nfserr_inval;
1326                 }
1327         }
1328         DECODE_TAIL;
1329 }
1330
1331 static __be32
1332 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1333                              struct nfsd4_destroy_session *destroy_session)
1334 {
1335         DECODE_HEAD;
1336         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1337         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1338
1339         DECODE_TAIL;
1340 }
1341
1342 static __be32
1343 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1344                           struct nfsd4_free_stateid *free_stateid)
1345 {
1346         DECODE_HEAD;
1347
1348         READ_BUF(sizeof(stateid_t));
1349         READ32(free_stateid->fr_stateid.si_generation);
1350         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1351
1352         DECODE_TAIL;
1353 }
1354
1355 static __be32
1356 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1357                       struct nfsd4_sequence *seq)
1358 {
1359         DECODE_HEAD;
1360
1361         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1362         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1363         READ32(seq->seqid);
1364         READ32(seq->slotid);
1365         READ32(seq->maxslots);
1366         READ32(seq->cachethis);
1367
1368         DECODE_TAIL;
1369 }
1370
1371 static __be32
1372 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1373 {
1374         unsigned int nbytes;
1375         stateid_t si;
1376         int i;
1377         __be32 *p;
1378         __be32 status;
1379
1380         READ_BUF(4);
1381         test_stateid->ts_num_ids = ntohl(*p++);
1382
1383         nbytes = test_stateid->ts_num_ids * sizeof(stateid_t);
1384         if (nbytes > (u32)((char *)argp->end - (char *)argp->p))
1385                 goto xdr_error;
1386
1387         test_stateid->ts_saved_args = argp;
1388         save_buf(argp, &test_stateid->ts_savedp);
1389
1390         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1391                 status = nfsd4_decode_stateid(argp, &si);
1392                 if (status)
1393                         return status;
1394         }
1395
1396         status = 0;
1397 out:
1398         return status;
1399 xdr_error:
1400         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1401         status = nfserr_bad_xdr;
1402         goto out;
1403 }
1404
1405 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1406 {
1407         DECODE_HEAD;
1408
1409         READ_BUF(4);
1410         READ32(rc->rca_one_fs);
1411
1412         DECODE_TAIL;
1413 }
1414
1415 static __be32
1416 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1417 {
1418         return nfs_ok;
1419 }
1420
1421 static __be32
1422 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1423 {
1424         return nfserr_notsupp;
1425 }
1426
1427 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1428
1429 static nfsd4_dec nfsd4_dec_ops[] = {
1430         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1431         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1432         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1433         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1434         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1435         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1436         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1437         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1438         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1439         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1440         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1441         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1442         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1443         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1444         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1445         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1446         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1447         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1448         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1449         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1450         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1451         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1452         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1453         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1454         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1455         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1456         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1457         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1458         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1459         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1460         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1461         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1462         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1463         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1464         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1465         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1466         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1467 };
1468
1469 static nfsd4_dec nfsd41_dec_ops[] = {
1470         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1471         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1472         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1473         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1474         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1475         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1476         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1477         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1478         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1479         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1480         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1481         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1482         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1483         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1484         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1485         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1486         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1487         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1488         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1489         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1490         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1491         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1492         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1493         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1494         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1495         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1496         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1497         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1498         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1499         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1500         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1501         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1502         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1503         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1504         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1505         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1506         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1507
1508         /* new operations for NFSv4.1 */
1509         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1510         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1511         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1512         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1513         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1514         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1515         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1516         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1517         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1518         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1519         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1520         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1521         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1522         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1523         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1524         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1525         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1526         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_notsupp,
1527         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1528 };
1529
1530 struct nfsd4_minorversion_ops {
1531         nfsd4_dec *decoders;
1532         int nops;
1533 };
1534
1535 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1536         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1537         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1538 };
1539
1540 static __be32
1541 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1542 {
1543         DECODE_HEAD;
1544         struct nfsd4_op *op;
1545         struct nfsd4_minorversion_ops *ops;
1546         bool cachethis = false;
1547         int i;
1548
1549         /*
1550          * XXX: According to spec, we should check the tag
1551          * for UTF-8 compliance.  I'm postponing this for
1552          * now because it seems that some clients do use
1553          * binary tags.
1554          */
1555         READ_BUF(4);
1556         READ32(argp->taglen);
1557         READ_BUF(argp->taglen + 8);
1558         SAVEMEM(argp->tag, argp->taglen);
1559         READ32(argp->minorversion);
1560         READ32(argp->opcnt);
1561
1562         if (argp->taglen > NFSD4_MAX_TAGLEN)
1563                 goto xdr_error;
1564         if (argp->opcnt > 100)
1565                 goto xdr_error;
1566
1567         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1568                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1569                 if (!argp->ops) {
1570                         argp->ops = argp->iops;
1571                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1572                         goto xdr_error;
1573                 }
1574         }
1575
1576         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1577                 argp->opcnt = 0;
1578
1579         ops = &nfsd4_minorversion[argp->minorversion];
1580         for (i = 0; i < argp->opcnt; i++) {
1581                 op = &argp->ops[i];
1582                 op->replay = NULL;
1583
1584                 /*
1585                  * We can't use READ_BUF() here because we need to handle
1586                  * a missing opcode as an OP_WRITE + 1. So we need to check
1587                  * to see if we're truly at the end of our buffer or if there
1588                  * is another page we need to flip to.
1589                  */
1590
1591                 if (argp->p == argp->end) {
1592                         if (argp->pagelen < 4) {
1593                                 /* There isn't an opcode still on the wire */
1594                                 op->opnum = OP_WRITE + 1;
1595                                 op->status = nfserr_bad_xdr;
1596                                 argp->opcnt = i+1;
1597                                 break;
1598                         }
1599
1600                         /*
1601                          * False alarm. We just hit a page boundary, but there
1602                          * is still data available.  Move pointer across page
1603                          * boundary.  *snip from READ_BUF*
1604                          */
1605                         argp->p = page_address(argp->pagelist[0]);
1606                         argp->pagelist++;
1607                         if (argp->pagelen < PAGE_SIZE) {
1608                                 argp->end = argp->p + (argp->pagelen>>2);
1609                                 argp->pagelen = 0;
1610                         } else {
1611                                 argp->end = argp->p + (PAGE_SIZE>>2);
1612                                 argp->pagelen -= PAGE_SIZE;
1613                         }
1614                 }
1615                 op->opnum = ntohl(*argp->p++);
1616
1617                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1618                         op->status = ops->decoders[op->opnum](argp, &op->u);
1619                 else {
1620                         op->opnum = OP_ILLEGAL;
1621                         op->status = nfserr_op_illegal;
1622                 }
1623
1624                 if (op->status) {
1625                         argp->opcnt = i+1;
1626                         break;
1627                 }
1628                 /*
1629                  * We'll try to cache the result in the DRC if any one
1630                  * op in the compound wants to be cached:
1631                  */
1632                 cachethis |= nfsd4_cache_this_op(op);
1633         }
1634         /* Sessions make the DRC unnecessary: */
1635         if (argp->minorversion)
1636                 cachethis = false;
1637         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1638
1639         DECODE_TAIL;
1640 }
1641
1642 #define WRITE32(n)               *p++ = htonl(n)
1643 #define WRITE64(n)               do {                           \
1644         *p++ = htonl((u32)((n) >> 32));                         \
1645         *p++ = htonl((u32)(n));                                 \
1646 } while (0)
1647 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1648         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1649         memcpy(p, ptr, nbytes);                                 \
1650         p += XDR_QUADLEN(nbytes);                               \
1651 }} while (0)
1652
1653 static void write32(__be32 **p, u32 n)
1654 {
1655         *(*p)++ = n;
1656 }
1657
1658 static void write64(__be32 **p, u64 n)
1659 {
1660         write32(p, (u32)(n >> 32));
1661         write32(p, (u32)n);
1662 }
1663
1664 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1665 {
1666         if (IS_I_VERSION(inode)) {
1667                 write64(p, inode->i_version);
1668         } else {
1669                 write32(p, stat->ctime.tv_sec);
1670                 write32(p, stat->ctime.tv_nsec);
1671         }
1672 }
1673
1674 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1675 {
1676         write32(p, c->atomic);
1677         if (c->change_supported) {
1678                 write64(p, c->before_change);
1679                 write64(p, c->after_change);
1680         } else {
1681                 write32(p, c->before_ctime_sec);
1682                 write32(p, c->before_ctime_nsec);
1683                 write32(p, c->after_ctime_sec);
1684                 write32(p, c->after_ctime_nsec);
1685         }
1686 }
1687
1688 #define RESERVE_SPACE(nbytes)   do {                            \
1689         p = resp->p;                                            \
1690         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1691 } while (0)
1692 #define ADJUST_ARGS()           resp->p = p
1693
1694 /*
1695  * Header routine to setup seqid operation replay cache
1696  */
1697 #define ENCODE_SEQID_OP_HEAD                                    \
1698         __be32 *save;                                           \
1699                                                                 \
1700         save = resp->p;
1701
1702 /*
1703  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1704  * is where sequence id's are incremented, and the replay cache is filled.
1705  * Note that we increment sequence id's here, at the last moment, so we're sure
1706  * we know whether the error to be returned is a sequence id mutating error.
1707  */
1708
1709 static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1710 {
1711         struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1712
1713         if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1714                 stateowner->so_seqid++;
1715                 stateowner->so_replay.rp_status = nfserr;
1716                 stateowner->so_replay.rp_buflen =
1717                           (char *)resp->p - (char *)save;
1718                 memcpy(stateowner->so_replay.rp_buf, save,
1719                         stateowner->so_replay.rp_buflen);
1720                 nfsd4_purge_closed_stateid(stateowner);
1721         }
1722 }
1723
1724 /* Encode as an array of strings the string given with components
1725  * separated @sep.
1726  */
1727 static __be32 nfsd4_encode_components(char sep, char *components,
1728                                    __be32 **pp, int *buflen)
1729 {
1730         __be32 *p = *pp;
1731         __be32 *countp = p;
1732         int strlen, count=0;
1733         char *str, *end;
1734
1735         dprintk("nfsd4_encode_components(%s)\n", components);
1736         if ((*buflen -= 4) < 0)
1737                 return nfserr_resource;
1738         WRITE32(0); /* We will fill this in with @count later */
1739         end = str = components;
1740         while (*end) {
1741                 for (; *end && (*end != sep); end++)
1742                         ; /* Point to end of component */
1743                 strlen = end - str;
1744                 if (strlen) {
1745                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1746                                 return nfserr_resource;
1747                         WRITE32(strlen);
1748                         WRITEMEM(str, strlen);
1749                         count++;
1750                 }
1751                 else
1752                         end++;
1753                 str = end;
1754         }
1755         *pp = p;
1756         p = countp;
1757         WRITE32(count);
1758         return 0;
1759 }
1760
1761 /*
1762  * encode a location element of a fs_locations structure
1763  */
1764 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1765                                     __be32 **pp, int *buflen)
1766 {
1767         __be32 status;
1768         __be32 *p = *pp;
1769
1770         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1771         if (status)
1772                 return status;
1773         status = nfsd4_encode_components('/', location->path, &p, buflen);
1774         if (status)
1775                 return status;
1776         *pp = p;
1777         return 0;
1778 }
1779
1780 /*
1781  * Encode a path in RFC3530 'pathname4' format
1782  */
1783 static __be32 nfsd4_encode_path(const struct path *root,
1784                 const struct path *path, __be32 **pp, int *buflen)
1785 {
1786         struct path cur = {
1787                 .mnt = path->mnt,
1788                 .dentry = path->dentry,
1789         };
1790         __be32 *p = *pp;
1791         struct dentry **components = NULL;
1792         unsigned int ncomponents = 0;
1793         __be32 err = nfserr_jukebox;
1794
1795         dprintk("nfsd4_encode_components(");
1796
1797         path_get(&cur);
1798         /* First walk the path up to the nfsd root, and store the
1799          * dentries/path components in an array.
1800          */
1801         for (;;) {
1802                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1803                         break;
1804                 if (cur.dentry == cur.mnt->mnt_root) {
1805                         if (follow_up(&cur))
1806                                 continue;
1807                         goto out_free;
1808                 }
1809                 if ((ncomponents & 15) == 0) {
1810                         struct dentry **new;
1811                         new = krealloc(components,
1812                                         sizeof(*new) * (ncomponents + 16),
1813                                         GFP_KERNEL);
1814                         if (!new)
1815                                 goto out_free;
1816                         components = new;
1817                 }
1818                 components[ncomponents++] = cur.dentry;
1819                 cur.dentry = dget_parent(cur.dentry);
1820         }
1821
1822         *buflen -= 4;
1823         if (*buflen < 0)
1824                 goto out_free;
1825         WRITE32(ncomponents);
1826
1827         while (ncomponents) {
1828                 struct dentry *dentry = components[ncomponents - 1];
1829                 unsigned int len = dentry->d_name.len;
1830
1831                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1832                 if (*buflen < 0)
1833                         goto out_free;
1834                 WRITE32(len);
1835                 WRITEMEM(dentry->d_name.name, len);
1836                 dprintk("/%s", dentry->d_name.name);
1837                 dput(dentry);
1838                 ncomponents--;
1839         }
1840
1841         *pp = p;
1842         err = 0;
1843 out_free:
1844         dprintk(")\n");
1845         while (ncomponents)
1846                 dput(components[--ncomponents]);
1847         kfree(components);
1848         path_put(&cur);
1849         return err;
1850 }
1851
1852 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1853                 const struct path *path, __be32 **pp, int *buflen)
1854 {
1855         struct svc_export *exp_ps;
1856         __be32 res;
1857
1858         exp_ps = rqst_find_fsidzero_export(rqstp);
1859         if (IS_ERR(exp_ps))
1860                 return nfserrno(PTR_ERR(exp_ps));
1861         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1862         exp_put(exp_ps);
1863         return res;
1864 }
1865
1866 /*
1867  *  encode a fs_locations structure
1868  */
1869 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1870                                      struct svc_export *exp,
1871                                      __be32 **pp, int *buflen)
1872 {
1873         __be32 status;
1874         int i;
1875         __be32 *p = *pp;
1876         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1877
1878         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1879         if (status)
1880                 return status;
1881         if ((*buflen -= 4) < 0)
1882                 return nfserr_resource;
1883         WRITE32(fslocs->locations_count);
1884         for (i=0; i<fslocs->locations_count; i++) {
1885                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1886                                                    &p, buflen);
1887                 if (status)
1888                         return status;
1889         }
1890         *pp = p;
1891         return 0;
1892 }
1893
1894 static u32 nfs4_file_type(umode_t mode)
1895 {
1896         switch (mode & S_IFMT) {
1897         case S_IFIFO:   return NF4FIFO;
1898         case S_IFCHR:   return NF4CHR;
1899         case S_IFDIR:   return NF4DIR;
1900         case S_IFBLK:   return NF4BLK;
1901         case S_IFLNK:   return NF4LNK;
1902         case S_IFREG:   return NF4REG;
1903         case S_IFSOCK:  return NF4SOCK;
1904         default:        return NF4BAD;
1905         };
1906 }
1907
1908 static __be32
1909 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1910                         __be32 **p, int *buflen)
1911 {
1912         int status;
1913
1914         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1915                 return nfserr_resource;
1916         if (whotype != NFS4_ACL_WHO_NAMED)
1917                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1918         else if (group)
1919                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1920         else
1921                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1922         if (status < 0)
1923                 return nfserrno(status);
1924         *p = xdr_encode_opaque(*p, NULL, status);
1925         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1926         BUG_ON(*buflen < 0);
1927         return 0;
1928 }
1929
1930 static inline __be32
1931 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1932 {
1933         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1934 }
1935
1936 static inline __be32
1937 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1938 {
1939         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1940 }
1941
1942 static inline __be32
1943 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1944                 __be32 **p, int *buflen)
1945 {
1946         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1947 }
1948
1949 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1950                               FATTR4_WORD0_RDATTR_ERROR)
1951 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1952
1953 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1954 {
1955         /* As per referral draft:  */
1956         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1957             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1958                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1959                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1960                         *rdattr_err = NFSERR_MOVED;
1961                 else
1962                         return nfserr_moved;
1963         }
1964         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1965         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1966         return 0;
1967 }
1968
1969 /*
1970  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1971  * ourselves.
1972  *
1973  * @countp is the buffer size in _words_; upon successful return this becomes
1974  * replaced with the number of words written.
1975  */
1976 __be32
1977 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1978                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1979                 struct svc_rqst *rqstp, int ignore_crossmnt)
1980 {
1981         u32 bmval0 = bmval[0];
1982         u32 bmval1 = bmval[1];
1983         u32 bmval2 = bmval[2];
1984         struct kstat stat;
1985         struct svc_fh tempfh;
1986         struct kstatfs statfs;
1987         int buflen = *countp << 2;
1988         __be32 *attrlenp;
1989         u32 dummy;
1990         u64 dummy64;
1991         u32 rdattr_err = 0;
1992         __be32 *p = buffer;
1993         __be32 status;
1994         int err;
1995         int aclsupport = 0;
1996         struct nfs4_acl *acl = NULL;
1997         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1998         u32 minorversion = resp->cstate.minorversion;
1999         struct path path = {
2000                 .mnt    = exp->ex_path.mnt,
2001                 .dentry = dentry,
2002         };
2003
2004         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2005         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2006         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2007         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2008
2009         if (exp->ex_fslocs.migrated) {
2010                 BUG_ON(bmval[2]);
2011                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2012                 if (status)
2013                         goto out;
2014         }
2015
2016         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2017         if (err)
2018                 goto out_nfserr;
2019         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2020                         FATTR4_WORD0_MAXNAME)) ||
2021             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2022                        FATTR4_WORD1_SPACE_TOTAL))) {
2023                 err = vfs_statfs(&path, &statfs);
2024                 if (err)
2025                         goto out_nfserr;
2026         }
2027         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2028                 fh_init(&tempfh, NFS4_FHSIZE);
2029                 status = fh_compose(&tempfh, exp, dentry, NULL);
2030                 if (status)
2031                         goto out;
2032                 fhp = &tempfh;
2033         }
2034         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2035                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2036                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2037                 aclsupport = (err == 0);
2038                 if (bmval0 & FATTR4_WORD0_ACL) {
2039                         if (err == -EOPNOTSUPP)
2040                                 bmval0 &= ~FATTR4_WORD0_ACL;
2041                         else if (err == -EINVAL) {
2042                                 status = nfserr_attrnotsupp;
2043                                 goto out;
2044                         } else if (err != 0)
2045                                 goto out_nfserr;
2046                 }
2047         }
2048
2049         if (bmval2) {
2050                 if ((buflen -= 16) < 0)
2051                         goto out_resource;
2052                 WRITE32(3);
2053                 WRITE32(bmval0);
2054                 WRITE32(bmval1);
2055                 WRITE32(bmval2);
2056         } else if (bmval1) {
2057                 if ((buflen -= 12) < 0)
2058                         goto out_resource;
2059                 WRITE32(2);
2060                 WRITE32(bmval0);
2061                 WRITE32(bmval1);
2062         } else {
2063                 if ((buflen -= 8) < 0)
2064                         goto out_resource;
2065                 WRITE32(1);
2066                 WRITE32(bmval0);
2067         }
2068         attrlenp = p++;                /* to be backfilled later */
2069
2070         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2071                 u32 word0 = nfsd_suppattrs0(minorversion);
2072                 u32 word1 = nfsd_suppattrs1(minorversion);
2073                 u32 word2 = nfsd_suppattrs2(minorversion);
2074
2075                 if (!aclsupport)
2076                         word0 &= ~FATTR4_WORD0_ACL;
2077                 if (!word2) {
2078                         if ((buflen -= 12) < 0)
2079                                 goto out_resource;
2080                         WRITE32(2);
2081                         WRITE32(word0);
2082                         WRITE32(word1);
2083                 } else {
2084                         if ((buflen -= 16) < 0)
2085                                 goto out_resource;
2086                         WRITE32(3);
2087                         WRITE32(word0);
2088                         WRITE32(word1);
2089                         WRITE32(word2);
2090                 }
2091         }
2092         if (bmval0 & FATTR4_WORD0_TYPE) {
2093                 if ((buflen -= 4) < 0)
2094                         goto out_resource;
2095                 dummy = nfs4_file_type(stat.mode);
2096                 if (dummy == NF4BAD)
2097                         goto out_serverfault;
2098                 WRITE32(dummy);
2099         }
2100         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2101                 if ((buflen -= 4) < 0)
2102                         goto out_resource;
2103                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2104                         WRITE32(NFS4_FH_PERSISTENT);
2105                 else
2106                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2107         }
2108         if (bmval0 & FATTR4_WORD0_CHANGE) {
2109                 if ((buflen -= 8) < 0)
2110                         goto out_resource;
2111                 write_change(&p, &stat, dentry->d_inode);
2112         }
2113         if (bmval0 & FATTR4_WORD0_SIZE) {
2114                 if ((buflen -= 8) < 0)
2115                         goto out_resource;
2116                 WRITE64(stat.size);
2117         }
2118         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2119                 if ((buflen -= 4) < 0)
2120                         goto out_resource;
2121                 WRITE32(1);
2122         }
2123         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2124                 if ((buflen -= 4) < 0)
2125                         goto out_resource;
2126                 WRITE32(1);
2127         }
2128         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2129                 if ((buflen -= 4) < 0)
2130                         goto out_resource;
2131                 WRITE32(0);
2132         }
2133         if (bmval0 & FATTR4_WORD0_FSID) {
2134                 if ((buflen -= 16) < 0)
2135                         goto out_resource;
2136                 if (exp->ex_fslocs.migrated) {
2137                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2138                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2139                 } else switch(fsid_source(fhp)) {
2140                 case FSIDSOURCE_FSID:
2141                         WRITE64((u64)exp->ex_fsid);
2142                         WRITE64((u64)0);
2143                         break;
2144                 case FSIDSOURCE_DEV:
2145                         WRITE32(0);
2146                         WRITE32(MAJOR(stat.dev));
2147                         WRITE32(0);
2148                         WRITE32(MINOR(stat.dev));
2149                         break;
2150                 case FSIDSOURCE_UUID:
2151                         WRITEMEM(exp->ex_uuid, 16);
2152                         break;
2153                 }
2154         }
2155         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2156                 if ((buflen -= 4) < 0)
2157                         goto out_resource;
2158                 WRITE32(0);
2159         }
2160         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2161                 if ((buflen -= 4) < 0)
2162                         goto out_resource;
2163                 WRITE32(nfsd4_lease);
2164         }
2165         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2166                 if ((buflen -= 4) < 0)
2167                         goto out_resource;
2168                 WRITE32(rdattr_err);
2169         }
2170         if (bmval0 & FATTR4_WORD0_ACL) {
2171                 struct nfs4_ace *ace;
2172
2173                 if (acl == NULL) {
2174                         if ((buflen -= 4) < 0)
2175                                 goto out_resource;
2176
2177                         WRITE32(0);
2178                         goto out_acl;
2179                 }
2180                 if ((buflen -= 4) < 0)
2181                         goto out_resource;
2182                 WRITE32(acl->naces);
2183
2184                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2185                         if ((buflen -= 4*3) < 0)
2186                                 goto out_resource;
2187                         WRITE32(ace->type);
2188                         WRITE32(ace->flag);
2189                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2190                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
2191                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2192                                 &p, &buflen);
2193                         if (status == nfserr_resource)
2194                                 goto out_resource;
2195                         if (status)
2196                                 goto out;
2197                 }
2198         }
2199 out_acl:
2200         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2201                 if ((buflen -= 4) < 0)
2202                         goto out_resource;
2203                 WRITE32(aclsupport ?
2204                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2205         }
2206         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2207                 if ((buflen -= 4) < 0)
2208                         goto out_resource;
2209                 WRITE32(1);
2210         }
2211         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2212                 if ((buflen -= 4) < 0)
2213                         goto out_resource;
2214                 WRITE32(1);
2215         }
2216         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2217                 if ((buflen -= 4) < 0)
2218                         goto out_resource;
2219                 WRITE32(1);
2220         }
2221         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2222                 if ((buflen -= 4) < 0)
2223                         goto out_resource;
2224                 WRITE32(1);
2225         }
2226         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2227                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2228                 if (buflen < 0)
2229                         goto out_resource;
2230                 WRITE32(fhp->fh_handle.fh_size);
2231                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2232         }
2233         if (bmval0 & FATTR4_WORD0_FILEID) {
2234                 if ((buflen -= 8) < 0)
2235                         goto out_resource;
2236                 WRITE64(stat.ino);
2237         }
2238         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2239                 if ((buflen -= 8) < 0)
2240                         goto out_resource;
2241                 WRITE64((u64) statfs.f_ffree);
2242         }
2243         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2244                 if ((buflen -= 8) < 0)
2245                         goto out_resource;
2246                 WRITE64((u64) statfs.f_ffree);
2247         }
2248         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2249                 if ((buflen -= 8) < 0)
2250                         goto out_resource;
2251                 WRITE64((u64) statfs.f_files);
2252         }
2253         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2254                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2255                 if (status == nfserr_resource)
2256                         goto out_resource;
2257                 if (status)
2258                         goto out;
2259         }
2260         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2261                 if ((buflen -= 4) < 0)
2262                         goto out_resource;
2263                 WRITE32(1);
2264         }
2265         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2266                 if ((buflen -= 8) < 0)
2267                         goto out_resource;
2268                 WRITE64(~(u64)0);
2269         }
2270         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2271                 if ((buflen -= 4) < 0)
2272                         goto out_resource;
2273                 WRITE32(255);
2274         }
2275         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2276                 if ((buflen -= 4) < 0)
2277                         goto out_resource;
2278                 WRITE32(statfs.f_namelen);
2279         }
2280         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2281                 if ((buflen -= 8) < 0)
2282                         goto out_resource;
2283                 WRITE64((u64) svc_max_payload(rqstp));
2284         }
2285         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2286                 if ((buflen -= 8) < 0)
2287                         goto out_resource;
2288                 WRITE64((u64) svc_max_payload(rqstp));
2289         }
2290         if (bmval1 & FATTR4_WORD1_MODE) {
2291                 if ((buflen -= 4) < 0)
2292                         goto out_resource;
2293                 WRITE32(stat.mode & S_IALLUGO);
2294         }
2295         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2296                 if ((buflen -= 4) < 0)
2297                         goto out_resource;
2298                 WRITE32(1);
2299         }
2300         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2301                 if ((buflen -= 4) < 0)
2302                         goto out_resource;
2303                 WRITE32(stat.nlink);
2304         }
2305         if (bmval1 & FATTR4_WORD1_OWNER) {
2306                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2307                 if (status == nfserr_resource)
2308                         goto out_resource;
2309                 if (status)
2310                         goto out;
2311         }
2312         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2313                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2314                 if (status == nfserr_resource)
2315                         goto out_resource;
2316                 if (status)
2317                         goto out;
2318         }
2319         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2320                 if ((buflen -= 8) < 0)
2321                         goto out_resource;
2322                 WRITE32((u32) MAJOR(stat.rdev));
2323                 WRITE32((u32) MINOR(stat.rdev));
2324         }
2325         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2326                 if ((buflen -= 8) < 0)
2327                         goto out_resource;
2328                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2329                 WRITE64(dummy64);
2330         }
2331         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2332                 if ((buflen -= 8) < 0)
2333                         goto out_resource;
2334                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2335                 WRITE64(dummy64);
2336         }
2337         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2338                 if ((buflen -= 8) < 0)
2339                         goto out_resource;
2340                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2341                 WRITE64(dummy64);
2342         }
2343         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2344                 if ((buflen -= 8) < 0)
2345                         goto out_resource;
2346                 dummy64 = (u64)stat.blocks << 9;
2347                 WRITE64(dummy64);
2348         }
2349         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2350                 if ((buflen -= 12) < 0)
2351                         goto out_resource;
2352                 WRITE32(0);
2353                 WRITE32(stat.atime.tv_sec);
2354                 WRITE32(stat.atime.tv_nsec);
2355         }
2356         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2357                 if ((buflen -= 12) < 0)
2358                         goto out_resource;
2359                 WRITE32(0);
2360                 WRITE32(1);
2361                 WRITE32(0);
2362         }
2363         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2364                 if ((buflen -= 12) < 0)
2365                         goto out_resource;
2366                 WRITE32(0);
2367                 WRITE32(stat.ctime.tv_sec);
2368                 WRITE32(stat.ctime.tv_nsec);
2369         }
2370         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2371                 if ((buflen -= 12) < 0)
2372                         goto out_resource;
2373                 WRITE32(0);
2374                 WRITE32(stat.mtime.tv_sec);
2375                 WRITE32(stat.mtime.tv_nsec);
2376         }
2377         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2378                 if ((buflen -= 8) < 0)
2379                         goto out_resource;
2380                 /*
2381                  * Get parent's attributes if not ignoring crossmount
2382                  * and this is the root of a cross-mounted filesystem.
2383                  */
2384                 if (ignore_crossmnt == 0 &&
2385                     dentry == exp->ex_path.mnt->mnt_root) {
2386                         struct path path = exp->ex_path;
2387                         path_get(&path);
2388                         while (follow_up(&path)) {
2389                                 if (path.dentry != path.mnt->mnt_root)
2390                                         break;
2391                         }
2392                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2393                         path_put(&path);
2394                         if (err)
2395                                 goto out_nfserr;
2396                 }
2397                 WRITE64(stat.ino);
2398         }
2399         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2400                 WRITE32(3);
2401                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2402                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2403                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2404         }
2405
2406         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2407         *countp = p - buffer;
2408         status = nfs_ok;
2409
2410 out:
2411         kfree(acl);
2412         if (fhp == &tempfh)
2413                 fh_put(&tempfh);
2414         return status;
2415 out_nfserr:
2416         status = nfserrno(err);
2417         goto out;
2418 out_resource:
2419         *countp = 0;
2420         status = nfserr_resource;
2421         goto out;
2422 out_serverfault:
2423         status = nfserr_serverfault;
2424         goto out;
2425 }
2426
2427 static inline int attributes_need_mount(u32 *bmval)
2428 {
2429         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2430                 return 1;
2431         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2432                 return 1;
2433         return 0;
2434 }
2435
2436 static __be32
2437 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2438                 const char *name, int namlen, __be32 *p, int *buflen)
2439 {
2440         struct svc_export *exp = cd->rd_fhp->fh_export;
2441         struct dentry *dentry;
2442         __be32 nfserr;
2443         int ignore_crossmnt = 0;
2444
2445         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2446         if (IS_ERR(dentry))
2447                 return nfserrno(PTR_ERR(dentry));
2448         if (!dentry->d_inode) {
2449                 /*
2450                  * nfsd_buffered_readdir drops the i_mutex between
2451                  * readdir and calling this callback, leaving a window
2452                  * where this directory entry could have gone away.
2453                  */
2454                 dput(dentry);
2455                 return nfserr_noent;
2456         }
2457
2458         exp_get(exp);
2459         /*
2460          * In the case of a mountpoint, the client may be asking for
2461          * attributes that are only properties of the underlying filesystem
2462          * as opposed to the cross-mounted file system. In such a case,
2463          * we will not follow the cross mount and will fill the attribtutes
2464          * directly from the mountpoint dentry.
2465          */
2466         if (nfsd_mountpoint(dentry, exp)) {
2467                 int err;
2468
2469                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2470                                 && !attributes_need_mount(cd->rd_bmval)) {
2471                         ignore_crossmnt = 1;
2472                         goto out_encode;
2473                 }
2474                 /*
2475                  * Why the heck aren't we just using nfsd_lookup??
2476                  * Different "."/".." handling?  Something else?
2477                  * At least, add a comment here to explain....
2478                  */
2479                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2480                 if (err) {
2481                         nfserr = nfserrno(err);
2482                         goto out_put;
2483                 }
2484                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2485                 if (nfserr)
2486                         goto out_put;
2487
2488         }
2489 out_encode:
2490         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2491                                         cd->rd_rqstp, ignore_crossmnt);
2492 out_put:
2493         dput(dentry);
2494         exp_put(exp);
2495         return nfserr;
2496 }
2497
2498 static __be32 *
2499 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2500 {
2501         __be32 *attrlenp;
2502
2503         if (buflen < 6)
2504                 return NULL;
2505         *p++ = htonl(2);
2506         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2507         *p++ = htonl(0);                         /* bmval1 */
2508
2509         attrlenp = p++;
2510         *p++ = nfserr;       /* no htonl */
2511         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2512         return p;
2513 }
2514
2515 static int
2516 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2517                     loff_t offset, u64 ino, unsigned int d_type)
2518 {
2519         struct readdir_cd *ccd = ccdv;
2520         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2521         int buflen;
2522         __be32 *p = cd->buffer;
2523         __be32 *cookiep;
2524         __be32 nfserr = nfserr_toosmall;
2525
2526         /* In nfsv4, "." and ".." never make it onto the wire.. */
2527         if (name && isdotent(name, namlen)) {
2528                 cd->common.err = nfs_ok;
2529                 return 0;
2530         }
2531
2532         if (cd->offset)
2533                 xdr_encode_hyper(cd->offset, (u64) offset);
2534
2535         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2536         if (buflen < 0)
2537                 goto fail;
2538
2539         *p++ = xdr_one;                             /* mark entry present */
2540         cookiep = p;
2541         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2542         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2543
2544         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2545         switch (nfserr) {
2546         case nfs_ok:
2547                 p += buflen;
2548                 break;
2549         case nfserr_resource:
2550                 nfserr = nfserr_toosmall;
2551                 goto fail;
2552         case nfserr_noent:
2553                 goto skip_entry;
2554         default:
2555                 /*
2556                  * If the client requested the RDATTR_ERROR attribute,
2557                  * we stuff the error code into this attribute
2558                  * and continue.  If this attribute was not requested,
2559                  * then in accordance with the spec, we fail the
2560                  * entire READDIR operation(!)
2561                  */
2562                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2563                         goto fail;
2564                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2565                 if (p == NULL) {
2566                         nfserr = nfserr_toosmall;
2567                         goto fail;
2568                 }
2569         }
2570         cd->buflen -= (p - cd->buffer);
2571         cd->buffer = p;
2572         cd->offset = cookiep;
2573 skip_entry:
2574         cd->common.err = nfs_ok;
2575         return 0;
2576 fail:
2577         cd->common.err = nfserr;
2578         return -EINVAL;
2579 }
2580
2581 static void
2582 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2583 {
2584         __be32 *p;
2585
2586         RESERVE_SPACE(sizeof(stateid_t));
2587         WRITE32(sid->si_generation);
2588         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2589         ADJUST_ARGS();
2590 }
2591
2592 static __be32
2593 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2594 {
2595         __be32 *p;
2596
2597         if (!nfserr) {
2598                 RESERVE_SPACE(8);
2599                 WRITE32(access->ac_supported);
2600                 WRITE32(access->ac_resp_access);
2601                 ADJUST_ARGS();
2602         }
2603         return nfserr;
2604 }
2605
2606 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2607 {
2608         __be32 *p;
2609
2610         if (!nfserr) {
2611                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2612                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2613                 WRITE32(bcts->dir);
2614                 /* XXX: ? */
2615                 WRITE32(0);
2616                 ADJUST_ARGS();
2617         }
2618         return nfserr;
2619 }
2620
2621 static __be32
2622 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2623 {
2624         ENCODE_SEQID_OP_HEAD;
2625
2626         if (!nfserr)
2627                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2628
2629         encode_seqid_op_tail(resp, save, nfserr);
2630         return nfserr;
2631 }
2632
2633
2634 static __be32
2635 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2636 {
2637         __be32 *p;
2638
2639         if (!nfserr) {
2640                 RESERVE_SPACE(8);
2641                 WRITEMEM(commit->co_verf.data, 8);
2642                 ADJUST_ARGS();
2643         }
2644         return nfserr;
2645 }
2646
2647 static __be32
2648 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2649 {
2650         __be32 *p;
2651
2652         if (!nfserr) {
2653                 RESERVE_SPACE(32);
2654                 write_cinfo(&p, &create->cr_cinfo);
2655                 WRITE32(2);
2656                 WRITE32(create->cr_bmval[0]);
2657                 WRITE32(create->cr_bmval[1]);
2658                 ADJUST_ARGS();
2659         }
2660         return nfserr;
2661 }
2662
2663 static __be32
2664 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2665 {
2666         struct svc_fh *fhp = getattr->ga_fhp;
2667         int buflen;
2668
2669         if (nfserr)
2670                 return nfserr;
2671
2672         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2673         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2674                                     resp->p, &buflen, getattr->ga_bmval,
2675                                     resp->rqstp, 0);
2676         if (!nfserr)
2677                 resp->p += buflen;
2678         return nfserr;
2679 }
2680
2681 static __be32
2682 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2683 {
2684         struct svc_fh *fhp = *fhpp;
2685         unsigned int len;
2686         __be32 *p;
2687
2688         if (!nfserr) {
2689                 len = fhp->fh_handle.fh_size;
2690                 RESERVE_SPACE(len + 4);
2691                 WRITE32(len);
2692                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2693                 ADJUST_ARGS();
2694         }
2695         return nfserr;
2696 }
2697
2698 /*
2699 * Including all fields other than the name, a LOCK4denied structure requires
2700 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2701 */
2702 static void
2703 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2704 {
2705         struct xdr_netobj *conf = &ld->ld_owner;
2706         __be32 *p;
2707
2708         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2709         WRITE64(ld->ld_start);
2710         WRITE64(ld->ld_length);
2711         WRITE32(ld->ld_type);
2712         if (conf->len) {
2713                 WRITEMEM(&ld->ld_clientid, 8);
2714                 WRITE32(conf->len);
2715                 WRITEMEM(conf->data, conf->len);
2716                 kfree(conf->data);
2717         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2718                 WRITE64((u64)0); /* clientid */
2719                 WRITE32(0); /* length of owner name */
2720         }
2721         ADJUST_ARGS();
2722 }
2723
2724 static __be32
2725 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2726 {
2727         ENCODE_SEQID_OP_HEAD;
2728
2729         if (!nfserr)
2730                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2731         else if (nfserr == nfserr_denied)
2732                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2733
2734         encode_seqid_op_tail(resp, save, nfserr);
2735         return nfserr;
2736 }
2737
2738 static __be32
2739 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2740 {
2741         if (nfserr == nfserr_denied)
2742                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2743         return nfserr;
2744 }
2745
2746 static __be32
2747 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2748 {
2749         ENCODE_SEQID_OP_HEAD;
2750
2751         if (!nfserr)
2752                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2753
2754         encode_seqid_op_tail(resp, save, nfserr);
2755         return nfserr;
2756 }
2757
2758
2759 static __be32
2760 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2761 {
2762         __be32 *p;
2763
2764         if (!nfserr) {
2765                 RESERVE_SPACE(20);
2766                 write_cinfo(&p, &link->li_cinfo);
2767                 ADJUST_ARGS();
2768         }
2769         return nfserr;
2770 }
2771
2772
2773 static __be32
2774 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2775 {
2776         __be32 *p;
2777         ENCODE_SEQID_OP_HEAD;
2778
2779         if (nfserr)
2780                 goto out;
2781
2782         nfsd4_encode_stateid(resp, &open->op_stateid);
2783         RESERVE_SPACE(40);
2784         write_cinfo(&p, &open->op_cinfo);
2785         WRITE32(open->op_rflags);
2786         WRITE32(2);
2787         WRITE32(open->op_bmval[0]);
2788         WRITE32(open->op_bmval[1]);
2789         WRITE32(open->op_delegate_type);
2790         ADJUST_ARGS();
2791
2792         switch (open->op_delegate_type) {
2793         case NFS4_OPEN_DELEGATE_NONE:
2794                 break;
2795         case NFS4_OPEN_DELEGATE_READ:
2796                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2797                 RESERVE_SPACE(20);
2798                 WRITE32(open->op_recall);
2799
2800                 /*
2801                  * TODO: ACE's in delegations
2802                  */
2803                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2804                 WRITE32(0);
2805                 WRITE32(0);
2806                 WRITE32(0);   /* XXX: is NULL principal ok? */
2807                 ADJUST_ARGS();
2808                 break;
2809         case NFS4_OPEN_DELEGATE_WRITE:
2810                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2811                 RESERVE_SPACE(32);
2812                 WRITE32(0);
2813
2814                 /*
2815                  * TODO: space_limit's in delegations
2816                  */
2817                 WRITE32(NFS4_LIMIT_SIZE);
2818                 WRITE32(~(u32)0);
2819                 WRITE32(~(u32)0);
2820
2821                 /*
2822                  * TODO: ACE's in delegations
2823                  */
2824                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2825                 WRITE32(0);
2826                 WRITE32(0);
2827                 WRITE32(0);   /* XXX: is NULL principal ok? */
2828                 ADJUST_ARGS();
2829                 break;
2830         default:
2831                 BUG();
2832         }
2833         /* XXX save filehandle here */
2834 out:
2835         encode_seqid_op_tail(resp, save, nfserr);
2836         return nfserr;
2837 }
2838
2839 static __be32
2840 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2841 {
2842         ENCODE_SEQID_OP_HEAD;
2843
2844         if (!nfserr)
2845                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2846
2847         encode_seqid_op_tail(resp, save, nfserr);
2848         return nfserr;
2849 }
2850
2851 static __be32
2852 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2853 {
2854         ENCODE_SEQID_OP_HEAD;
2855
2856         if (!nfserr)
2857                 nfsd4_encode_stateid(resp, &od->od_stateid);
2858
2859         encode_seqid_op_tail(resp, save, nfserr);
2860         return nfserr;
2861 }
2862
2863 static __be32
2864 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2865                   struct nfsd4_read *read)
2866 {
2867         u32 eof;
2868         int v, pn;
2869         unsigned long maxcount;
2870         long len;
2871         __be32 *p;
2872
2873         if (nfserr)
2874                 return nfserr;
2875         if (resp->xbuf->page_len)
2876                 return nfserr_resource;
2877
2878         RESERVE_SPACE(8); /* eof flag and byte count */
2879
2880         maxcount = svc_max_payload(resp->rqstp);
2881         if (maxcount > read->rd_length)
2882                 maxcount = read->rd_length;
2883
2884         len = maxcount;
2885         v = 0;
2886         while (len > 0) {
2887                 pn = resp->rqstp->rq_resused++;
2888                 resp->rqstp->rq_vec[v].iov_base =
2889                         page_address(resp->rqstp->rq_respages[pn]);
2890                 resp->rqstp->rq_vec[v].iov_len =
2891                         len < PAGE_SIZE ? len : PAGE_SIZE;
2892                 v++;
2893                 len -= PAGE_SIZE;
2894         }
2895         read->rd_vlen = v;
2896
2897         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2898                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2899                         &maxcount);
2900
2901         if (nfserr)
2902                 return nfserr;
2903         eof = (read->rd_offset + maxcount >=
2904                read->rd_fhp->fh_dentry->d_inode->i_size);
2905
2906         WRITE32(eof);
2907         WRITE32(maxcount);
2908         ADJUST_ARGS();
2909         resp->xbuf->head[0].iov_len = (char*)p
2910                                         - (char*)resp->xbuf->head[0].iov_base;
2911         resp->xbuf->page_len = maxcount;
2912
2913         /* Use rest of head for padding and remaining ops: */
2914         resp->xbuf->tail[0].iov_base = p;
2915         resp->xbuf->tail[0].iov_len = 0;
2916         if (maxcount&3) {
2917                 RESERVE_SPACE(4);
2918                 WRITE32(0);
2919                 resp->xbuf->tail[0].iov_base += maxcount&3;
2920                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2921                 ADJUST_ARGS();
2922         }
2923         return 0;
2924 }
2925
2926 static __be32
2927 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2928 {
2929         int maxcount;
2930         char *page;
2931         __be32 *p;
2932
2933         if (nfserr)
2934                 return nfserr;
2935         if (resp->xbuf->page_len)
2936                 return nfserr_resource;
2937
2938         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2939
2940         maxcount = PAGE_SIZE;
2941         RESERVE_SPACE(4);
2942
2943         /*
2944          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2945          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2946          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2947          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2948          */
2949         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2950         if (nfserr == nfserr_isdir)
2951                 return nfserr_inval;
2952         if (nfserr)
2953                 return nfserr;
2954
2955         WRITE32(maxcount);
2956         ADJUST_ARGS();
2957         resp->xbuf->head[0].iov_len = (char*)p
2958                                 - (char*)resp->xbuf->head[0].iov_base;
2959         resp->xbuf->page_len = maxcount;
2960
2961         /* Use rest of head for padding and remaining ops: */
2962         resp->xbuf->tail[0].iov_base = p;
2963         resp->xbuf->tail[0].iov_len = 0;
2964         if (maxcount&3) {
2965                 RESERVE_SPACE(4);
2966                 WRITE32(0);
2967                 resp->xbuf->tail[0].iov_base += maxcount&3;
2968                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2969                 ADJUST_ARGS();
2970         }
2971         return 0;
2972 }
2973
2974 static __be32
2975 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2976 {
2977         int maxcount;
2978         loff_t offset;
2979         __be32 *page, *savep, *tailbase;
2980         __be32 *p;
2981
2982         if (nfserr)
2983                 return nfserr;
2984         if (resp->xbuf->page_len)
2985                 return nfserr_resource;
2986
2987         RESERVE_SPACE(8);  /* verifier */
2988         savep = p;
2989
2990         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2991         WRITE32(0);
2992         WRITE32(0);
2993         ADJUST_ARGS();
2994         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2995         tailbase = p;
2996
2997         maxcount = PAGE_SIZE;
2998         if (maxcount > readdir->rd_maxcount)
2999                 maxcount = readdir->rd_maxcount;
3000
3001         /*
3002          * Convert from bytes to words, account for the two words already
3003          * written, make sure to leave two words at the end for the next
3004          * pointer and eof field.
3005          */
3006         maxcount = (maxcount >> 2) - 4;
3007         if (maxcount < 0) {
3008                 nfserr =  nfserr_toosmall;
3009                 goto err_no_verf;
3010         }
3011
3012         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3013         readdir->common.err = 0;
3014         readdir->buflen = maxcount;
3015         readdir->buffer = page;
3016         readdir->offset = NULL;
3017
3018         offset = readdir->rd_cookie;
3019         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3020                               &offset,
3021                               &readdir->common, nfsd4_encode_dirent);
3022         if (nfserr == nfs_ok &&
3023             readdir->common.err == nfserr_toosmall &&
3024             readdir->buffer == page)
3025                 nfserr = nfserr_toosmall;
3026         if (nfserr)
3027                 goto err_no_verf;
3028
3029         if (readdir->offset)
3030                 xdr_encode_hyper(readdir->offset, offset);
3031
3032         p = readdir->buffer;
3033         *p++ = 0;       /* no more entries */
3034         *p++ = htonl(readdir->common.err == nfserr_eof);
3035         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
3036                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
3037
3038         /* Use rest of head for padding and remaining ops: */
3039         resp->xbuf->tail[0].iov_base = tailbase;
3040         resp->xbuf->tail[0].iov_len = 0;
3041         resp->p = resp->xbuf->tail[0].iov_base;
3042         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3043
3044         return 0;
3045 err_no_verf:
3046         p = savep;
3047         ADJUST_ARGS();
3048         return nfserr;
3049 }
3050
3051 static __be32
3052 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3053 {
3054         __be32 *p;
3055
3056         if (!nfserr) {
3057                 RESERVE_SPACE(20);
3058                 write_cinfo(&p, &remove->rm_cinfo);
3059                 ADJUST_ARGS();
3060         }
3061         return nfserr;
3062 }
3063
3064 static __be32
3065 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3066 {
3067         __be32 *p;
3068
3069         if (!nfserr) {
3070                 RESERVE_SPACE(40);
3071                 write_cinfo(&p, &rename->rn_sinfo);
3072                 write_cinfo(&p, &rename->rn_tinfo);
3073                 ADJUST_ARGS();
3074         }
3075         return nfserr;
3076 }
3077
3078 static __be32
3079 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3080                          __be32 nfserr,struct svc_export *exp)
3081 {
3082         int i = 0;
3083         u32 nflavs;
3084         struct exp_flavor_info *flavs;
3085         struct exp_flavor_info def_flavs[2];
3086         __be32 *p;
3087
3088         if (nfserr)
3089                 goto out;
3090         if (exp->ex_nflavors) {
3091                 flavs = exp->ex_flavors;
3092                 nflavs = exp->ex_nflavors;
3093         } else { /* Handling of some defaults in absence of real secinfo: */
3094                 flavs = def_flavs;
3095                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3096                         nflavs = 2;
3097                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3098                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3099                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3100                         nflavs = 1;
3101                         flavs[0].pseudoflavor
3102                                         = svcauth_gss_flavor(exp->ex_client);
3103                 } else {
3104                         nflavs = 1;
3105                         flavs[0].pseudoflavor
3106                                         = exp->ex_client->flavour->flavour;
3107                 }
3108         }
3109
3110         RESERVE_SPACE(4);
3111         WRITE32(nflavs);
3112         ADJUST_ARGS();
3113         for (i = 0; i < nflavs; i++) {
3114                 u32 flav = flavs[i].pseudoflavor;
3115                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3116
3117                 if (gm) {
3118                         RESERVE_SPACE(4);
3119                         WRITE32(RPC_AUTH_GSS);
3120                         ADJUST_ARGS();
3121                         RESERVE_SPACE(4 + gm->gm_oid.len);
3122                         WRITE32(gm->gm_oid.len);
3123                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3124                         ADJUST_ARGS();
3125                         RESERVE_SPACE(4);
3126                         WRITE32(0); /* qop */
3127                         ADJUST_ARGS();
3128                         RESERVE_SPACE(4);
3129                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
3130                         ADJUST_ARGS();
3131                         gss_mech_put(gm);
3132                 } else {
3133                         RESERVE_SPACE(4);
3134                         WRITE32(flav);
3135                         ADJUST_ARGS();
3136                 }
3137         }
3138 out:
3139         if (exp)
3140                 exp_put(exp);
3141         return nfserr;
3142 }
3143
3144 static __be32
3145 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3146                      struct nfsd4_secinfo *secinfo)
3147 {
3148         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3149 }
3150
3151 static __be32
3152 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3153                      struct nfsd4_secinfo_no_name *secinfo)
3154 {
3155         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3156 }
3157
3158 /*
3159  * The SETATTR encode routine is special -- it always encodes a bitmap,
3160  * regardless of the error status.
3161  */
3162 static __be32
3163 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3164 {
3165         __be32 *p;
3166
3167         RESERVE_SPACE(12);
3168         if (nfserr) {
3169                 WRITE32(2);
3170                 WRITE32(0);
3171                 WRITE32(0);
3172         }
3173         else {
3174                 WRITE32(2);
3175                 WRITE32(setattr->sa_bmval[0]);
3176                 WRITE32(setattr->sa_bmval[1]);
3177         }
3178         ADJUST_ARGS();
3179         return nfserr;
3180 }
3181
3182 static __be32
3183 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3184 {
3185         __be32 *p;
3186
3187         if (!nfserr) {
3188                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
3189                 WRITEMEM(&scd->se_clientid, 8);
3190                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
3191                 ADJUST_ARGS();
3192         }
3193         else if (nfserr == nfserr_clid_inuse) {
3194                 RESERVE_SPACE(8);
3195                 WRITE32(0);
3196                 WRITE32(0);
3197                 ADJUST_ARGS();
3198         }
3199         return nfserr;
3200 }
3201
3202 static __be32
3203 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3204 {
3205         __be32 *p;
3206
3207         if (!nfserr) {
3208                 RESERVE_SPACE(16);
3209                 WRITE32(write->wr_bytes_written);
3210                 WRITE32(write->wr_how_written);
3211                 WRITEMEM(write->wr_verifier.data, 8);
3212                 ADJUST_ARGS();
3213         }
3214         return nfserr;
3215 }
3216
3217 static __be32
3218 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3219                          struct nfsd4_exchange_id *exid)
3220 {
3221         __be32 *p;
3222         char *major_id;
3223         char *server_scope;
3224         int major_id_sz;
3225         int server_scope_sz;
3226         uint64_t minor_id = 0;
3227
3228         if (nfserr)
3229                 return nfserr;
3230
3231         major_id = utsname()->nodename;
3232         major_id_sz = strlen(major_id);
3233         server_scope = utsname()->nodename;
3234         server_scope_sz = strlen(server_scope);
3235
3236         RESERVE_SPACE(
3237                 8 /* eir_clientid */ +
3238                 4 /* eir_sequenceid */ +
3239                 4 /* eir_flags */ +
3240                 4 /* spr_how (SP4_NONE) */ +
3241                 8 /* so_minor_id */ +
3242                 4 /* so_major_id.len */ +
3243                 (XDR_QUADLEN(major_id_sz) * 4) +
3244                 4 /* eir_server_scope.len */ +
3245                 (XDR_QUADLEN(server_scope_sz) * 4) +
3246                 4 /* eir_server_impl_id.count (0) */);
3247
3248         WRITEMEM(&exid->clientid, 8);
3249         WRITE32(exid->seqid);
3250         WRITE32(exid->flags);
3251
3252         /* state_protect4_r. Currently only support SP4_NONE */
3253         BUG_ON(exid->spa_how != SP4_NONE);
3254         WRITE32(exid->spa_how);
3255
3256         /* The server_owner struct */
3257         WRITE64(minor_id);      /* Minor id */
3258         /* major id */
3259         WRITE32(major_id_sz);
3260         WRITEMEM(major_id, major_id_sz);
3261
3262         /* Server scope */
3263         WRITE32(server_scope_sz);
3264         WRITEMEM(server_scope, server_scope_sz);
3265
3266         /* Implementation id */
3267         WRITE32(0);     /* zero length nfs_impl_id4 array */
3268         ADJUST_ARGS();
3269         return 0;
3270 }
3271
3272 static __be32
3273 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3274                             struct nfsd4_create_session *sess)
3275 {
3276         __be32 *p;
3277
3278         if (nfserr)
3279                 return nfserr;
3280
3281         RESERVE_SPACE(24);
3282         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3283         WRITE32(sess->seqid);
3284         WRITE32(sess->flags);
3285         ADJUST_ARGS();
3286
3287         RESERVE_SPACE(28);
3288         WRITE32(0); /* headerpadsz */
3289         WRITE32(sess->fore_channel.maxreq_sz);
3290         WRITE32(sess->fore_channel.maxresp_sz);
3291         WRITE32(sess->fore_channel.maxresp_cached);
3292         WRITE32(sess->fore_channel.maxops);
3293         WRITE32(sess->fore_channel.maxreqs);
3294         WRITE32(sess->fore_channel.nr_rdma_attrs);
3295         ADJUST_ARGS();
3296
3297         if (sess->fore_channel.nr_rdma_attrs) {
3298                 RESERVE_SPACE(4);
3299                 WRITE32(sess->fore_channel.rdma_attrs);
3300                 ADJUST_ARGS();
3301         }
3302
3303         RESERVE_SPACE(28);
3304         WRITE32(0); /* headerpadsz */
3305         WRITE32(sess->back_channel.maxreq_sz);
3306         WRITE32(sess->back_channel.maxresp_sz);
3307         WRITE32(sess->back_channel.maxresp_cached);
3308         WRITE32(sess->back_channel.maxops);
3309         WRITE32(sess->back_channel.maxreqs);
3310         WRITE32(sess->back_channel.nr_rdma_attrs);
3311         ADJUST_ARGS();
3312
3313         if (sess->back_channel.nr_rdma_attrs) {
3314                 RESERVE_SPACE(4);
3315                 WRITE32(sess->back_channel.rdma_attrs);
3316                 ADJUST_ARGS();
3317         }
3318         return 0;
3319 }
3320
3321 static __be32
3322 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3323                              struct nfsd4_destroy_session *destroy_session)
3324 {
3325         return nfserr;
3326 }
3327
3328 static __be32
3329 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, int nfserr,
3330                           struct nfsd4_free_stateid *free_stateid)
3331 {
3332         __be32 *p;
3333
3334         if (nfserr)
3335                 return nfserr;
3336
3337         RESERVE_SPACE(4);
3338         WRITE32(nfserr);
3339         ADJUST_ARGS();
3340         return nfserr;
3341 }
3342
3343 static __be32
3344 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3345                       struct nfsd4_sequence *seq)
3346 {
3347         __be32 *p;
3348
3349         if (nfserr)
3350                 return nfserr;
3351
3352         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3353         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3354         WRITE32(seq->seqid);
3355         WRITE32(seq->slotid);
3356         /* Note slotid's are numbered from zero: */
3357         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3358         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3359         WRITE32(seq->status_flags);
3360
3361         ADJUST_ARGS();
3362         resp->cstate.datap = p; /* DRC cache data pointer */
3363         return 0;
3364 }
3365
3366 __be32
3367 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, int nfserr,
3368                           struct nfsd4_test_stateid *test_stateid)
3369 {
3370         struct nfsd4_compoundargs *argp;
3371         struct nfs4_client *cl = resp->cstate.session->se_client;
3372         stateid_t si;
3373         __be32 *p;
3374         int i;
3375         int valid;
3376
3377         restore_buf(test_stateid->ts_saved_args, &test_stateid->ts_savedp);
3378         argp = test_stateid->ts_saved_args;
3379
3380         RESERVE_SPACE(4);
3381         *p++ = htonl(test_stateid->ts_num_ids);
3382         resp->p = p;
3383
3384         nfs4_lock_state();
3385         for (i = 0; i < test_stateid->ts_num_ids; i++) {
3386                 nfsd4_decode_stateid(argp, &si);
3387                 valid = nfs4_validate_stateid(cl, &si);
3388                 RESERVE_SPACE(4);
3389                 *p++ = htonl(valid);
3390                 resp->p = p;
3391         }
3392         nfs4_unlock_state();
3393
3394         return nfserr;
3395 }
3396
3397 static __be32
3398 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3399 {
3400         return nfserr;
3401 }
3402
3403 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3404
3405 /*
3406  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3407  * since we don't need to filter out obsolete ops as this is
3408  * done in the decoding phase.
3409  */
3410 static nfsd4_enc nfsd4_enc_ops[] = {
3411         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3412         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3413         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3414         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3415         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3416         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3417         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3418         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3419         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3420         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3421         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3422         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3423         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3424         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3425         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3426         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3427         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3428         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3429         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3430         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3431         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3432         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3433         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3434         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3435         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3436         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3437         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3438         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3439         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3440         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3441         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3442         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3443         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3444         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3445         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3446         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3447         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3448
3449         /* NFSv4.1 operations */
3450         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3451         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3452         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3453         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3454         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3455         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3456         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3457         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3458         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3459         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3460         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3461         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3462         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3463         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3464         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3465         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3466         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3467         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3468         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3469 };
3470
3471 /*
3472  * Calculate the total amount of memory that the compound response has taken
3473  * after encoding the current operation with pad.
3474  *
3475  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3476  *      which was specified at nfsd4_operation, else pad is zero.
3477  *
3478  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3479  *
3480  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3481  * will be at least a page and will therefore hold the xdr_buf head.
3482  */
3483 int nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3484 {
3485         struct xdr_buf *xb = &resp->rqstp->rq_res;
3486         struct nfsd4_session *session = NULL;
3487         struct nfsd4_slot *slot = resp->cstate.slot;
3488         u32 length, tlen = 0;
3489
3490         if (!nfsd4_has_session(&resp->cstate))
3491                 return 0;
3492
3493         session = resp->cstate.session;
3494         if (session == NULL)
3495                 return 0;
3496
3497         if (xb->page_len == 0) {
3498                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3499         } else {
3500                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3501                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3502
3503                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3504         }
3505         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3506                 length, xb->page_len, tlen, pad);
3507
3508         if (length > session->se_fchannel.maxresp_sz)
3509                 return nfserr_rep_too_big;
3510
3511         if (slot->sl_cachethis == 1 &&
3512             length > session->se_fchannel.maxresp_cached)
3513                 return nfserr_rep_too_big_to_cache;
3514
3515         return 0;
3516 }
3517
3518 void
3519 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3520 {
3521         __be32 *statp;
3522         __be32 *p;
3523
3524         RESERVE_SPACE(8);
3525         WRITE32(op->opnum);
3526         statp = p++;    /* to be backfilled at the end */
3527         ADJUST_ARGS();
3528
3529         if (op->opnum == OP_ILLEGAL)
3530                 goto status;
3531         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3532                !nfsd4_enc_ops[op->opnum]);
3533         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3534         /* nfsd4_check_drc_limit guarantees enough room for error status */
3535         if (!op->status)
3536                 op->status = nfsd4_check_resp_size(resp, 0);
3537 status:
3538         /*
3539          * Note: We write the status directly, instead of using WRITE32(),
3540          * since it is already in network byte order.
3541          */
3542         *statp = op->status;
3543 }
3544
3545 /*
3546  * Encode the reply stored in the stateowner reply cache
3547  *
3548  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3549  * previously sent already encoded operation.
3550  *
3551  * called with nfs4_lock_state() held
3552  */
3553 void
3554 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3555 {
3556         __be32 *p;
3557         struct nfs4_replay *rp = op->replay;
3558
3559         BUG_ON(!rp);
3560
3561         RESERVE_SPACE(8);
3562         WRITE32(op->opnum);
3563         *p++ = rp->rp_status;  /* already xdr'ed */
3564         ADJUST_ARGS();
3565
3566         RESERVE_SPACE(rp->rp_buflen);
3567         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3568         ADJUST_ARGS();
3569 }
3570
3571 int
3572 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3573 {
3574         return xdr_ressize_check(rqstp, p);
3575 }
3576
3577 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3578 {
3579         struct svc_rqst *rqstp = rq;
3580         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3581
3582         if (args->ops != args->iops) {
3583                 kfree(args->ops);
3584                 args->ops = args->iops;
3585         }
3586         kfree(args->tmpp);
3587         args->tmpp = NULL;
3588         while (args->to_free) {
3589                 struct tmpbuf *tb = args->to_free;
3590                 args->to_free = tb->next;
3591                 tb->release(tb->buf);
3592                 kfree(tb);
3593         }
3594         return 1;
3595 }
3596
3597 int
3598 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3599 {
3600         args->p = p;
3601         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3602         args->pagelist = rqstp->rq_arg.pages;
3603         args->pagelen = rqstp->rq_arg.page_len;
3604         args->tmpp = NULL;
3605         args->to_free = NULL;
3606         args->ops = args->iops;
3607         args->rqstp = rqstp;
3608
3609         return !nfsd4_decode_compound(args);
3610 }
3611
3612 int
3613 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3614 {
3615         /*
3616          * All that remains is to write the tag and operation count...
3617          */
3618         struct nfsd4_compound_state *cs = &resp->cstate;
3619         struct kvec *iov;
3620         p = resp->tagp;
3621         *p++ = htonl(resp->taglen);
3622         memcpy(p, resp->tag, resp->taglen);
3623         p += XDR_QUADLEN(resp->taglen);
3624         *p++ = htonl(resp->opcnt);
3625
3626         if (rqstp->rq_res.page_len)
3627                 iov = &rqstp->rq_res.tail[0];
3628         else
3629                 iov = &rqstp->rq_res.head[0];
3630         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3631         BUG_ON(iov->iov_len > PAGE_SIZE);
3632         if (nfsd4_has_session(cs)) {
3633                 if (cs->status != nfserr_replay_cache) {
3634                         nfsd4_store_cache_entry(resp);
3635                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3636                         cs->slot->sl_inuse = false;
3637                 }
3638                 /* Renew the clientid on success and on replay */
3639                 release_session_client(cs->session);
3640                 nfsd4_put_session(cs->session);
3641         }
3642         return 1;
3643 }
3644
3645 /*
3646  * Local variables:
3647  *  c-basic-offset: 8
3648  * End:
3649  */