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         case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 681               NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 682                 return nfs_ok;
 683         }
 684 xdr_error:
 685         return nfserr_bad_xdr;
 686 }
 687
 688 static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 689 {
 690         __be32 *p;
 691
 692         READ_BUF(4);
 693         READ32(*x);
 694         /* Note: unlinke access bits, deny bits may be zero. */
 695         if (*x & ~NFS4_SHARE_DENY_BOTH)
 696                 return nfserr_bad_xdr;
 697         return nfs_ok;
 698 xdr_error:
 699         return nfserr_bad_xdr;
 700 }
 701
 702 static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 703 {
 704         __be32 *p;
 705
 706         READ_BUF(4);
 707         READ32(o->len);
 708
 709         if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 710                 return nfserr_bad_xdr;
 711
 712         READ_BUF(o->len);
 713         SAVEMEM(o->data, o->len);
 714         return nfs_ok;
 715 xdr_error:
 716         return nfserr_bad_xdr;
 717 }
 718
 719 static __be32
 720 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 721 {
 722         DECODE_HEAD;
 723
 724         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 725         open->op_iattr.ia_valid = 0;
 726         open->op_openowner = NULL;
 727
 728         /* seqid, share_access, share_deny, clientid, ownerlen */
 729         READ_BUF(4);
 730         READ32(open->op_seqid);
 731         status = nfsd4_decode_share_access(argp, &open->op_share_access);
 732         if (status)
 733                 goto xdr_error;
 734         status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 735         if (status)
 736                 goto xdr_error;
 737         READ_BUF(sizeof(clientid_t));
 738         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 739         status = nfsd4_decode_opaque(argp, &open->op_owner);
 740         if (status)
 741                 goto xdr_error;
 742         READ_BUF(4);
 743         READ32(open->op_create);
 744         switch (open->op_create) {
 745         case NFS4_OPEN_NOCREATE:
 746                 break;
 747         case NFS4_OPEN_CREATE:
 748                 READ_BUF(4);
 749                 READ32(open->op_createmode);
 750                 switch (open->op_createmode) {
 751                 case NFS4_CREATE_UNCHECKED:
 752                 case NFS4_CREATE_GUARDED:
 753                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 754                                 &open->op_iattr, &open->op_acl);
 755                         if (status)
 756                                 goto out;
 757                         break;
 758                 case NFS4_CREATE_EXCLUSIVE:
 759                         READ_BUF(8);
 760                         COPYMEM(open->op_verf.data, 8);
 761                         break;
 762                 case NFS4_CREATE_EXCLUSIVE4_1:
 763                         if (argp->minorversion < 1)
 764                                 goto xdr_error;
 765                         READ_BUF(8);
 766                         COPYMEM(open->op_verf.data, 8);
 767                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 768                                 &open->op_iattr, &open->op_acl);
 769                         if (status)
 770                                 goto out;
 771                         break;
 772                 default:
 773                         goto xdr_error;
 774                 }
 775                 break;
 776         default:
 777                 goto xdr_error;
 778         }
 779
 780         /* open_claim */
 781         READ_BUF(4);
 782         READ32(open->op_claim_type);
 783         switch (open->op_claim_type) {
 784         case NFS4_OPEN_CLAIM_NULL:
 785         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 786                 READ_BUF(4);
 787                 READ32(open->op_fname.len);
 788                 READ_BUF(open->op_fname.len);
 789                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 790                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 791                         return status;
 792                 break;
 793         case NFS4_OPEN_CLAIM_PREVIOUS:
 794                 READ_BUF(4);
 795                 READ32(open->op_delegate_type);
 796                 break;
 797         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 798                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 799                 if (status)
 800                         return status;
 801                 READ_BUF(4);
 802                 READ32(open->op_fname.len);
 803                 READ_BUF(open->op_fname.len);
 804                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 805                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 806                         return status;
 807                 break;
 808         case NFS4_OPEN_CLAIM_FH:
 809         case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 810                 if (argp->minorversion < 1)
 811                         goto xdr_error;
 812                 /* void */
 813                 break;
 814         case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 815                 if (argp->minorversion < 1)
 816                         goto xdr_error;
 817                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 818                 if (status)
 819                         return status;
 820                 break;
 821         default:
 822                 goto xdr_error;
 823         }
 824
 825         DECODE_TAIL;
 826 }
 827
 828 static __be32
 829 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 830 {
 831         DECODE_HEAD;
 832
 833         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 834         if (status)
 835                 return status;
 836         READ_BUF(4);
 837         READ32(open_conf->oc_seqid);
 838
 839         DECODE_TAIL;
 840 }
 841
 842 static __be32
 843 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 844 {
 845         DECODE_HEAD;
 846
 847         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 848         if (status)
 849                 return status;
 850         READ_BUF(4);
 851         READ32(open_down->od_seqid);
 852         status = nfsd4_decode_share_access(argp, &open_down->od_share_access);
 853         if (status)
 854                 return status;
 855         status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 856         if (status)
 857                 return status;
 858         DECODE_TAIL;
 859 }
 860
 861 static __be32
 862 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 863 {
 864         DECODE_HEAD;
 865
 866         READ_BUF(4);
 867         READ32(putfh->pf_fhlen);
 868         if (putfh->pf_fhlen > NFS4_FHSIZE)
 869                 goto xdr_error;
 870         READ_BUF(putfh->pf_fhlen);
 871         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 872
 873         DECODE_TAIL;
 874 }
 875
 876 static __be32
 877 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 878 {
 879         DECODE_HEAD;
 880
 881         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 882         if (status)
 883                 return status;
 884         READ_BUF(12);
 885         READ64(read->rd_offset);
 886         READ32(read->rd_length);
 887
 888         DECODE_TAIL;
 889 }
 890
 891 static __be32
 892 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 893 {
 894         DECODE_HEAD;
 895
 896         READ_BUF(24);
 897         READ64(readdir->rd_cookie);
 898         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 899         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 900         READ32(readdir->rd_maxcount);
 901         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 902                 goto out;
 903
 904         DECODE_TAIL;
 905 }
 906
 907 static __be32
 908 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 909 {
 910         DECODE_HEAD;
 911
 912         READ_BUF(4);
 913         READ32(remove->rm_namelen);
 914         READ_BUF(remove->rm_namelen);
 915         SAVEMEM(remove->rm_name, remove->rm_namelen);
 916         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 917                 return status;
 918
 919         DECODE_TAIL;
 920 }
 921
 922 static __be32
 923 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 924 {
 925         DECODE_HEAD;
 926
 927         READ_BUF(4);
 928         READ32(rename->rn_snamelen);
 929         READ_BUF(rename->rn_snamelen + 4);
 930         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 931         READ32(rename->rn_tnamelen);
 932         READ_BUF(rename->rn_tnamelen);
 933         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 934         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 935                 return status;
 936         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 937                 return status;
 938
 939         DECODE_TAIL;
 940 }
 941
 942 static __be32
 943 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 944 {
 945         DECODE_HEAD;
 946
 947         READ_BUF(sizeof(clientid_t));
 948         COPYMEM(clientid, sizeof(clientid_t));
 949
 950         DECODE_TAIL;
 951 }
 952
 953 static __be32
 954 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 955                      struct nfsd4_secinfo *secinfo)
 956 {
 957         DECODE_HEAD;
 958
 959         READ_BUF(4);
 960         READ32(secinfo->si_namelen);
 961         READ_BUF(secinfo->si_namelen);
 962         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 963         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 964                                                                 nfserr_noent);
 965         if (status)
 966                 return status;
 967         DECODE_TAIL;
 968 }
 969
 970 static __be32
 971 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
 972                      struct nfsd4_secinfo_no_name *sin)
 973 {
 974         DECODE_HEAD;
 975
 976         READ_BUF(4);
 977         READ32(sin->sin_style);
 978         DECODE_TAIL;
 979 }
 980
 981 static __be32
 982 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 983 {
 984         __be32 status;
 985
 986         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 987         if (status)
 988                 return status;
 989         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 990                                   &setattr->sa_acl);
 991 }
 992
 993 static __be32
 994 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 995 {
 996         DECODE_HEAD;
 997
 998         READ_BUF(8);
 999         COPYMEM(setclientid->se_verf.data, 8);
1000
1001         status = nfsd4_decode_opaque(argp, &setclientid->se_name);
1002         if (status)
1003                 return nfserr_bad_xdr;
1004         READ_BUF(8);
1005         READ32(setclientid->se_callback_prog);
1006         READ32(setclientid->se_callback_netid_len);
1007
1008         READ_BUF(setclientid->se_callback_netid_len + 4);
1009         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1010         READ32(setclientid->se_callback_addr_len);
1011
1012         READ_BUF(setclientid->se_callback_addr_len + 4);
1013         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1014         READ32(setclientid->se_callback_ident);
1015
1016         DECODE_TAIL;
1017 }
1018
1019 static __be32
1020 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1021 {
1022         DECODE_HEAD;
1023
1024         READ_BUF(8 + sizeof(nfs4_verifier));
1025         COPYMEM(&scd_c->sc_clientid, 8);
1026         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
1027
1028         DECODE_TAIL;
1029 }
1030
1031 /* Also used for NVERIFY */
1032 static __be32
1033 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1034 {
1035 #if 0
1036         struct nfsd4_compoundargs save = {
1037                 .p = argp->p,
1038                 .end = argp->end,
1039                 .rqstp = argp->rqstp,
1040         };
1041         u32             ve_bmval[2];
1042         struct iattr    ve_iattr;           /* request */
1043         struct nfs4_acl *ve_acl;            /* request */
1044 #endif
1045         DECODE_HEAD;
1046
1047         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1048                 goto out;
1049
1050         /* For convenience's sake, we compare raw xdr'd attributes in
1051          * nfsd4_proc_verify; however we still decode here just to return
1052          * correct error in case of bad xdr. */
1053 #if 0
1054         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1055         if (status == nfserr_inval) {
1056                 status = nfserrno(status);
1057                 goto out;
1058         }
1059 #endif
1060         READ_BUF(4);
1061         READ32(verify->ve_attrlen);
1062         READ_BUF(verify->ve_attrlen);
1063         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1064
1065         DECODE_TAIL;
1066 }
1067
1068 static __be32
1069 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1070 {
1071         int avail;
1072         int v;
1073         int len;
1074         DECODE_HEAD;
1075
1076         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1077         if (status)
1078                 return status;
1079         READ_BUF(16);
1080         READ64(write->wr_offset);
1081         READ32(write->wr_stable_how);
1082         if (write->wr_stable_how > 2)
1083                 goto xdr_error;
1084         READ32(write->wr_buflen);
1085
1086         /* Sorry .. no magic macros for this.. *
1087          * READ_BUF(write->wr_buflen);
1088          * SAVEMEM(write->wr_buf, write->wr_buflen);
1089          */
1090         avail = (char*)argp->end - (char*)argp->p;
1091         if (avail + argp->pagelen < write->wr_buflen) {
1092                 dprintk("NFSD: xdr error (%s:%d)\n",
1093                                 __FILE__, __LINE__);
1094                 goto xdr_error;
1095         }
1096         argp->rqstp->rq_vec[0].iov_base = p;
1097         argp->rqstp->rq_vec[0].iov_len = avail;
1098         v = 0;
1099         len = write->wr_buflen;
1100         while (len > argp->rqstp->rq_vec[v].iov_len) {
1101                 len -= argp->rqstp->rq_vec[v].iov_len;
1102                 v++;
1103                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
1104                 argp->pagelist++;
1105                 if (argp->pagelen >= PAGE_SIZE) {
1106                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1107                         argp->pagelen -= PAGE_SIZE;
1108                 } else {
1109                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1110                         argp->pagelen -= len;
1111                 }
1112         }
1113         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1114         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1115         argp->rqstp->rq_vec[v].iov_len = len;
1116         write->wr_vlen = v+1;
1117
1118         DECODE_TAIL;
1119 }
1120
1121 static __be32
1122 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1123 {
1124         DECODE_HEAD;
1125
1126         READ_BUF(12);
1127         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1128         READ32(rlockowner->rl_owner.len);
1129         READ_BUF(rlockowner->rl_owner.len);
1130         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1131
1132         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1133                 return nfserr_inval;
1134         DECODE_TAIL;
1135 }
1136
1137 static __be32
1138 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1139                          struct nfsd4_exchange_id *exid)
1140 {
1141         int dummy, tmp;
1142         DECODE_HEAD;
1143
1144         READ_BUF(NFS4_VERIFIER_SIZE);
1145         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1146
1147         status = nfsd4_decode_opaque(argp, &exid->clname);
1148         if (status)
1149                 return nfserr_bad_xdr;
1150
1151         READ_BUF(4);
1152         READ32(exid->flags);
1153
1154         /* Ignore state_protect4_a */
1155         READ_BUF(4);
1156         READ32(exid->spa_how);
1157         switch (exid->spa_how) {
1158         case SP4_NONE:
1159                 break;
1160         case SP4_MACH_CRED:
1161                 /* spo_must_enforce */
1162                 READ_BUF(4);
1163                 READ32(dummy);
1164                 READ_BUF(dummy * 4);
1165                 p += dummy;
1166
1167                 /* spo_must_allow */
1168                 READ_BUF(4);
1169                 READ32(dummy);
1170                 READ_BUF(dummy * 4);
1171                 p += dummy;
1172                 break;
1173         case SP4_SSV:
1174                 /* ssp_ops */
1175                 READ_BUF(4);
1176                 READ32(dummy);
1177                 READ_BUF(dummy * 4);
1178                 p += dummy;
1179
1180                 READ_BUF(4);
1181                 READ32(dummy);
1182                 READ_BUF(dummy * 4);
1183                 p += dummy;
1184
1185                 /* ssp_hash_algs<> */
1186                 READ_BUF(4);
1187                 READ32(tmp);
1188                 while (tmp--) {
1189                         READ_BUF(4);
1190                         READ32(dummy);
1191                         READ_BUF(dummy);
1192                         p += XDR_QUADLEN(dummy);
1193                 }
1194
1195                 /* ssp_encr_algs<> */
1196                 READ_BUF(4);
1197                 READ32(tmp);
1198                 while (tmp--) {
1199                         READ_BUF(4);
1200                         READ32(dummy);
1201                         READ_BUF(dummy);
1202                         p += XDR_QUADLEN(dummy);
1203                 }
1204
1205                 /* ssp_window and ssp_num_gss_handles */
1206                 READ_BUF(8);
1207                 READ32(dummy);
1208                 READ32(dummy);
1209                 break;
1210         default:
1211                 goto xdr_error;
1212         }
1213
1214         /* Ignore Implementation ID */
1215         READ_BUF(4);    /* nfs_impl_id4 array length */
1216         READ32(dummy);
1217
1218         if (dummy > 1)
1219                 goto xdr_error;
1220
1221         if (dummy == 1) {
1222                 /* nii_domain */
1223                 READ_BUF(4);
1224                 READ32(dummy);
1225                 READ_BUF(dummy);
1226                 p += XDR_QUADLEN(dummy);
1227
1228                 /* nii_name */
1229                 READ_BUF(4);
1230                 READ32(dummy);
1231                 READ_BUF(dummy);
1232                 p += XDR_QUADLEN(dummy);
1233
1234                 /* nii_date */
1235                 READ_BUF(12);
1236                 p += 3;
1237         }
1238         DECODE_TAIL;
1239 }
1240
1241 static __be32
1242 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1243                             struct nfsd4_create_session *sess)
1244 {
1245         DECODE_HEAD;
1246
1247         u32 dummy;
1248         char *machine_name;
1249         int i;
1250         int nr_secflavs;
1251
1252         READ_BUF(16);
1253         COPYMEM(&sess->clientid, 8);
1254         READ32(sess->seqid);
1255         READ32(sess->flags);
1256
1257         /* Fore channel attrs */
1258         READ_BUF(28);
1259         READ32(dummy); /* headerpadsz is always 0 */
1260         READ32(sess->fore_channel.maxreq_sz);
1261         READ32(sess->fore_channel.maxresp_sz);
1262         READ32(sess->fore_channel.maxresp_cached);
1263         READ32(sess->fore_channel.maxops);
1264         READ32(sess->fore_channel.maxreqs);
1265         READ32(sess->fore_channel.nr_rdma_attrs);
1266         if (sess->fore_channel.nr_rdma_attrs == 1) {
1267                 READ_BUF(4);
1268                 READ32(sess->fore_channel.rdma_attrs);
1269         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1270                 dprintk("Too many fore channel attr bitmaps!\n");
1271                 goto xdr_error;
1272         }
1273
1274         /* Back channel attrs */
1275         READ_BUF(28);
1276         READ32(dummy); /* headerpadsz is always 0 */
1277         READ32(sess->back_channel.maxreq_sz);
1278         READ32(sess->back_channel.maxresp_sz);
1279         READ32(sess->back_channel.maxresp_cached);
1280         READ32(sess->back_channel.maxops);
1281         READ32(sess->back_channel.maxreqs);
1282         READ32(sess->back_channel.nr_rdma_attrs);
1283         if (sess->back_channel.nr_rdma_attrs == 1) {
1284                 READ_BUF(4);
1285                 READ32(sess->back_channel.rdma_attrs);
1286         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1287                 dprintk("Too many back channel attr bitmaps!\n");
1288                 goto xdr_error;
1289         }
1290
1291         READ_BUF(8);
1292         READ32(sess->callback_prog);
1293
1294         /* callback_sec_params4 */
1295         READ32(nr_secflavs);
1296         for (i = 0; i < nr_secflavs; ++i) {
1297                 READ_BUF(4);
1298                 READ32(dummy);
1299                 switch (dummy) {
1300                 case RPC_AUTH_NULL:
1301                         /* Nothing to read */
1302                         break;
1303                 case RPC_AUTH_UNIX:
1304                         READ_BUF(8);
1305                         /* stamp */
1306                         READ32(dummy);
1307
1308                         /* machine name */
1309                         READ32(dummy);
1310                         READ_BUF(dummy);
1311                         SAVEMEM(machine_name, dummy);
1312
1313                         /* uid, gid */
1314                         READ_BUF(8);
1315                         READ32(sess->uid);
1316                         READ32(sess->gid);
1317
1318                         /* more gids */
1319                         READ_BUF(4);
1320                         READ32(dummy);
1321                         READ_BUF(dummy * 4);
1322                         break;
1323                 case RPC_AUTH_GSS:
1324                         dprintk("RPC_AUTH_GSS callback secflavor "
1325                                 "not supported!\n");
1326                         READ_BUF(8);
1327                         /* gcbp_service */
1328                         READ32(dummy);
1329                         /* gcbp_handle_from_server */
1330                         READ32(dummy);
1331                         READ_BUF(dummy);
1332                         p += XDR_QUADLEN(dummy);
1333                         /* gcbp_handle_from_client */
1334                         READ_BUF(4);
1335                         READ32(dummy);
1336                         READ_BUF(dummy);
1337                         break;
1338                 default:
1339                         dprintk("Illegal callback secflavor\n");
1340                         return nfserr_inval;
1341                 }
1342         }
1343         DECODE_TAIL;
1344 }
1345
1346 static __be32
1347 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1348                              struct nfsd4_destroy_session *destroy_session)
1349 {
1350         DECODE_HEAD;
1351         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1352         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1353
1354         DECODE_TAIL;
1355 }
1356
1357 static __be32
1358 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1359                           struct nfsd4_free_stateid *free_stateid)
1360 {
1361         DECODE_HEAD;
1362
1363         READ_BUF(sizeof(stateid_t));
1364         READ32(free_stateid->fr_stateid.si_generation);
1365         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1366
1367         DECODE_TAIL;
1368 }
1369
1370 static __be32
1371 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1372                       struct nfsd4_sequence *seq)
1373 {
1374         DECODE_HEAD;
1375
1376         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1377         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1378         READ32(seq->seqid);
1379         READ32(seq->slotid);
1380         READ32(seq->maxslots);
1381         READ32(seq->cachethis);
1382
1383         DECODE_TAIL;
1384 }
1385
1386 static __be32
1387 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1388 {
1389         unsigned int nbytes;
1390         stateid_t si;
1391         int i;
1392         __be32 *p;
1393         __be32 status;
1394
1395         READ_BUF(4);
1396         test_stateid->ts_num_ids = ntohl(*p++);
1397
1398         nbytes = test_stateid->ts_num_ids * sizeof(stateid_t);
1399         if (nbytes > (u32)((char *)argp->end - (char *)argp->p))
1400                 goto xdr_error;
1401
1402         test_stateid->ts_saved_args = argp;
1403         save_buf(argp, &test_stateid->ts_savedp);
1404
1405         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1406                 status = nfsd4_decode_stateid(argp, &si);
1407                 if (status)
1408                         return status;
1409         }
1410
1411         status = 0;
1412 out:
1413         return status;
1414 xdr_error:
1415         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1416         status = nfserr_bad_xdr;
1417         goto out;
1418 }
1419
1420 static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1421 {
1422         DECODE_HEAD;
1423
1424         READ_BUF(8);
1425         COPYMEM(&dc->clientid, 8);
1426
1427         DECODE_TAIL;
1428 }
1429
1430 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1431 {
1432         DECODE_HEAD;
1433
1434         READ_BUF(4);
1435         READ32(rc->rca_one_fs);
1436
1437         DECODE_TAIL;
1438 }
1439
1440 static __be32
1441 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1442 {
1443         return nfs_ok;
1444 }
1445
1446 static __be32
1447 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1448 {
1449         return nfserr_notsupp;
1450 }
1451
1452 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1453
1454 static nfsd4_dec nfsd4_dec_ops[] = {
1455         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1456         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1457         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1458         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1459         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1460         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1461         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1462         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1463         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1464         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1465         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1466         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1467         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1468         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1469         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1470         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1471         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1472         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1473         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1474         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1475         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1476         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1477         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1478         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1479         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1480         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1481         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1482         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1483         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1484         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1485         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1486         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1487         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1488         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1489         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1490         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1491         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1492 };
1493
1494 static nfsd4_dec nfsd41_dec_ops[] = {
1495         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1496         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1497         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1498         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1499         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1500         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1501         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1502         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1503         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1504         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1505         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1506         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1507         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1508         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1509         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1510         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1511         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1512         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1513         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1514         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1515         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1516         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1517         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1518         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1519         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1520         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1521         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1522         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1523         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1524         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1525         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1526         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1527         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1528         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1529         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1530         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1531         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1532
1533         /* new operations for NFSv4.1 */
1534         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1535         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1536         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1537         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1538         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1539         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1540         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1541         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1542         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1543         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1544         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1545         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1546         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1547         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1548         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1549         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1550         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1551         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1552         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1553 };
1554
1555 struct nfsd4_minorversion_ops {
1556         nfsd4_dec *decoders;
1557         int nops;
1558 };
1559
1560 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1561         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1562         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1563 };
1564
1565 static __be32
1566 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1567 {
1568         DECODE_HEAD;
1569         struct nfsd4_op *op;
1570         struct nfsd4_minorversion_ops *ops;
1571         bool cachethis = false;
1572         int i;
1573
1574         /*
1575          * XXX: According to spec, we should check the tag
1576          * for UTF-8 compliance.  I'm postponing this for
1577          * now because it seems that some clients do use
1578          * binary tags.
1579          */
1580         READ_BUF(4);
1581         READ32(argp->taglen);
1582         READ_BUF(argp->taglen + 8);
1583         SAVEMEM(argp->tag, argp->taglen);
1584         READ32(argp->minorversion);
1585         READ32(argp->opcnt);
1586
1587         if (argp->taglen > NFSD4_MAX_TAGLEN)
1588                 goto xdr_error;
1589         if (argp->opcnt > 100)
1590                 goto xdr_error;
1591
1592         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1593                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1594                 if (!argp->ops) {
1595                         argp->ops = argp->iops;
1596                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1597                         goto xdr_error;
1598                 }
1599         }
1600
1601         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1602                 argp->opcnt = 0;
1603
1604         ops = &nfsd4_minorversion[argp->minorversion];
1605         for (i = 0; i < argp->opcnt; i++) {
1606                 op = &argp->ops[i];
1607                 op->replay = NULL;
1608
1609                 /*
1610                  * We can't use READ_BUF() here because we need to handle
1611                  * a missing opcode as an OP_WRITE + 1. So we need to check
1612                  * to see if we're truly at the end of our buffer or if there
1613                  * is another page we need to flip to.
1614                  */
1615
1616                 if (argp->p == argp->end) {
1617                         if (argp->pagelen < 4) {
1618                                 /* There isn't an opcode still on the wire */
1619                                 op->opnum = OP_WRITE + 1;
1620                                 op->status = nfserr_bad_xdr;
1621                                 argp->opcnt = i+1;
1622                                 break;
1623                         }
1624
1625                         /*
1626                          * False alarm. We just hit a page boundary, but there
1627                          * is still data available.  Move pointer across page
1628                          * boundary.  *snip from READ_BUF*
1629                          */
1630                         argp->p = page_address(argp->pagelist[0]);
1631                         argp->pagelist++;
1632                         if (argp->pagelen < PAGE_SIZE) {
1633                                 argp->end = argp->p + (argp->pagelen>>2);
1634                                 argp->pagelen = 0;
1635                         } else {
1636                                 argp->end = argp->p + (PAGE_SIZE>>2);
1637                                 argp->pagelen -= PAGE_SIZE;
1638                         }
1639                 }
1640                 op->opnum = ntohl(*argp->p++);
1641
1642                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1643                         op->status = ops->decoders[op->opnum](argp, &op->u);
1644                 else {
1645                         op->opnum = OP_ILLEGAL;
1646                         op->status = nfserr_op_illegal;
1647                 }
1648
1649                 if (op->status) {
1650                         argp->opcnt = i+1;
1651                         break;
1652                 }
1653                 /*
1654                  * We'll try to cache the result in the DRC if any one
1655                  * op in the compound wants to be cached:
1656                  */
1657                 cachethis |= nfsd4_cache_this_op(op);
1658         }
1659         /* Sessions make the DRC unnecessary: */
1660         if (argp->minorversion)
1661                 cachethis = false;
1662         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1663
1664         DECODE_TAIL;
1665 }
1666
1667 #define WRITE32(n)               *p++ = htonl(n)
1668 #define WRITE64(n)               do {                           \
1669         *p++ = htonl((u32)((n) >> 32));                         \
1670         *p++ = htonl((u32)(n));                                 \
1671 } while (0)
1672 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1673         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1674         memcpy(p, ptr, nbytes);                                 \
1675         p += XDR_QUADLEN(nbytes);                               \
1676 }} while (0)
1677
1678 static void write32(__be32 **p, u32 n)
1679 {
1680         *(*p)++ = n;
1681 }
1682
1683 static void write64(__be32 **p, u64 n)
1684 {
1685         write32(p, (u32)(n >> 32));
1686         write32(p, (u32)n);
1687 }
1688
1689 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1690 {
1691         if (IS_I_VERSION(inode)) {
1692                 write64(p, inode->i_version);
1693         } else {
1694                 write32(p, stat->ctime.tv_sec);
1695                 write32(p, stat->ctime.tv_nsec);
1696         }
1697 }
1698
1699 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1700 {
1701         write32(p, c->atomic);
1702         if (c->change_supported) {
1703                 write64(p, c->before_change);
1704                 write64(p, c->after_change);
1705         } else {
1706                 write32(p, c->before_ctime_sec);
1707                 write32(p, c->before_ctime_nsec);
1708                 write32(p, c->after_ctime_sec);
1709                 write32(p, c->after_ctime_nsec);
1710         }
1711 }
1712
1713 #define RESERVE_SPACE(nbytes)   do {                            \
1714         p = resp->p;                                            \
1715         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1716 } while (0)
1717 #define ADJUST_ARGS()           resp->p = p
1718
1719 /*
1720  * Header routine to setup seqid operation replay cache
1721  */
1722 #define ENCODE_SEQID_OP_HEAD                                    \
1723         __be32 *save;                                           \
1724                                                                 \
1725         save = resp->p;
1726
1727 /*
1728  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1729  * is where sequence id's are incremented, and the replay cache is filled.
1730  * Note that we increment sequence id's here, at the last moment, so we're sure
1731  * we know whether the error to be returned is a sequence id mutating error.
1732  */
1733
1734 static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1735 {
1736         struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1737
1738         if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1739                 stateowner->so_seqid++;
1740                 stateowner->so_replay.rp_status = nfserr;
1741                 stateowner->so_replay.rp_buflen =
1742                           (char *)resp->p - (char *)save;
1743                 memcpy(stateowner->so_replay.rp_buf, save,
1744                         stateowner->so_replay.rp_buflen);
1745                 nfsd4_purge_closed_stateid(stateowner);
1746         }
1747 }
1748
1749 /* Encode as an array of strings the string given with components
1750  * separated @sep.
1751  */
1752 static __be32 nfsd4_encode_components(char sep, char *components,
1753                                    __be32 **pp, int *buflen)
1754 {
1755         __be32 *p = *pp;
1756         __be32 *countp = p;
1757         int strlen, count=0;
1758         char *str, *end;
1759
1760         dprintk("nfsd4_encode_components(%s)\n", components);
1761         if ((*buflen -= 4) < 0)
1762                 return nfserr_resource;
1763         WRITE32(0); /* We will fill this in with @count later */
1764         end = str = components;
1765         while (*end) {
1766                 for (; *end && (*end != sep); end++)
1767                         ; /* Point to end of component */
1768                 strlen = end - str;
1769                 if (strlen) {
1770                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1771                                 return nfserr_resource;
1772                         WRITE32(strlen);
1773                         WRITEMEM(str, strlen);
1774                         count++;
1775                 }
1776                 else
1777                         end++;
1778                 str = end;
1779         }
1780         *pp = p;
1781         p = countp;
1782         WRITE32(count);
1783         return 0;
1784 }
1785
1786 /*
1787  * encode a location element of a fs_locations structure
1788  */
1789 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1790                                     __be32 **pp, int *buflen)
1791 {
1792         __be32 status;
1793         __be32 *p = *pp;
1794
1795         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1796         if (status)
1797                 return status;
1798         status = nfsd4_encode_components('/', location->path, &p, buflen);
1799         if (status)
1800                 return status;
1801         *pp = p;
1802         return 0;
1803 }
1804
1805 /*
1806  * Encode a path in RFC3530 'pathname4' format
1807  */
1808 static __be32 nfsd4_encode_path(const struct path *root,
1809                 const struct path *path, __be32 **pp, int *buflen)
1810 {
1811         struct path cur = {
1812                 .mnt = path->mnt,
1813                 .dentry = path->dentry,
1814         };
1815         __be32 *p = *pp;
1816         struct dentry **components = NULL;
1817         unsigned int ncomponents = 0;
1818         __be32 err = nfserr_jukebox;
1819
1820         dprintk("nfsd4_encode_components(");
1821
1822         path_get(&cur);
1823         /* First walk the path up to the nfsd root, and store the
1824          * dentries/path components in an array.
1825          */
1826         for (;;) {
1827                 if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1828                         break;
1829                 if (cur.dentry == cur.mnt->mnt_root) {
1830                         if (follow_up(&cur))
1831                                 continue;
1832                         goto out_free;
1833                 }
1834                 if ((ncomponents & 15) == 0) {
1835                         struct dentry **new;
1836                         new = krealloc(components,
1837                                         sizeof(*new) * (ncomponents + 16),
1838                                         GFP_KERNEL);
1839                         if (!new)
1840                                 goto out_free;
1841                         components = new;
1842                 }
1843                 components[ncomponents++] = cur.dentry;
1844                 cur.dentry = dget_parent(cur.dentry);
1845         }
1846
1847         *buflen -= 4;
1848         if (*buflen < 0)
1849                 goto out_free;
1850         WRITE32(ncomponents);
1851
1852         while (ncomponents) {
1853                 struct dentry *dentry = components[ncomponents - 1];
1854                 unsigned int len = dentry->d_name.len;
1855
1856                 *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1857                 if (*buflen < 0)
1858                         goto out_free;
1859                 WRITE32(len);
1860                 WRITEMEM(dentry->d_name.name, len);
1861                 dprintk("/%s", dentry->d_name.name);
1862                 dput(dentry);
1863                 ncomponents--;
1864         }
1865
1866         *pp = p;
1867         err = 0;
1868 out_free:
1869         dprintk(")\n");
1870         while (ncomponents)
1871                 dput(components[--ncomponents]);
1872         kfree(components);
1873         path_put(&cur);
1874         return err;
1875 }
1876
1877 static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1878                 const struct path *path, __be32 **pp, int *buflen)
1879 {
1880         struct svc_export *exp_ps;
1881         __be32 res;
1882
1883         exp_ps = rqst_find_fsidzero_export(rqstp);
1884         if (IS_ERR(exp_ps))
1885                 return nfserrno(PTR_ERR(exp_ps));
1886         res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1887         exp_put(exp_ps);
1888         return res;
1889 }
1890
1891 /*
1892  *  encode a fs_locations structure
1893  */
1894 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1895                                      struct svc_export *exp,
1896                                      __be32 **pp, int *buflen)
1897 {
1898         __be32 status;
1899         int i;
1900         __be32 *p = *pp;
1901         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1902
1903         status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1904         if (status)
1905                 return status;
1906         if ((*buflen -= 4) < 0)
1907                 return nfserr_resource;
1908         WRITE32(fslocs->locations_count);
1909         for (i=0; i<fslocs->locations_count; i++) {
1910                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1911                                                    &p, buflen);
1912                 if (status)
1913                         return status;
1914         }
1915         *pp = p;
1916         return 0;
1917 }
1918
1919 static u32 nfs4_file_type(umode_t mode)
1920 {
1921         switch (mode & S_IFMT) {
1922         case S_IFIFO:   return NF4FIFO;
1923         case S_IFCHR:   return NF4CHR;
1924         case S_IFDIR:   return NF4DIR;
1925         case S_IFBLK:   return NF4BLK;
1926         case S_IFLNK:   return NF4LNK;
1927         case S_IFREG:   return NF4REG;
1928         case S_IFSOCK:  return NF4SOCK;
1929         default:        return NF4BAD;
1930         };
1931 }
1932
1933 static __be32
1934 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1935                         __be32 **p, int *buflen)
1936 {
1937         int status;
1938
1939         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1940                 return nfserr_resource;
1941         if (whotype != NFS4_ACL_WHO_NAMED)
1942                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1943         else if (group)
1944                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1945         else
1946                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1947         if (status < 0)
1948                 return nfserrno(status);
1949         *p = xdr_encode_opaque(*p, NULL, status);
1950         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1951         BUG_ON(*buflen < 0);
1952         return 0;
1953 }
1954
1955 static inline __be32
1956 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1957 {
1958         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1959 }
1960
1961 static inline __be32
1962 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1963 {
1964         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1965 }
1966
1967 static inline __be32
1968 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1969                 __be32 **p, int *buflen)
1970 {
1971         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1972 }
1973
1974 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1975                               FATTR4_WORD0_RDATTR_ERROR)
1976 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1977
1978 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1979 {
1980         /* As per referral draft:  */
1981         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1982             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1983                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1984                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1985                         *rdattr_err = NFSERR_MOVED;
1986                 else
1987                         return nfserr_moved;
1988         }
1989         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1990         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1991         return 0;
1992 }
1993
1994 /*
1995  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1996  * ourselves.
1997  *
1998  * @countp is the buffer size in _words_; upon successful return this becomes
1999  * replaced with the number of words written.
2000  */
2001 __be32
2002 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2003                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
2004                 struct svc_rqst *rqstp, int ignore_crossmnt)
2005 {
2006         u32 bmval0 = bmval[0];
2007         u32 bmval1 = bmval[1];
2008         u32 bmval2 = bmval[2];
2009         struct kstat stat;
2010         struct svc_fh tempfh;
2011         struct kstatfs statfs;
2012         int buflen = *countp << 2;
2013         __be32 *attrlenp;
2014         u32 dummy;
2015         u64 dummy64;
2016         u32 rdattr_err = 0;
2017         __be32 *p = buffer;
2018         __be32 status;
2019         int err;
2020         int aclsupport = 0;
2021         struct nfs4_acl *acl = NULL;
2022         struct nfsd4_compoundres *resp = rqstp->rq_resp;
2023         u32 minorversion = resp->cstate.minorversion;
2024         struct path path = {
2025                 .mnt    = exp->ex_path.mnt,
2026                 .dentry = dentry,
2027         };
2028
2029         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2030         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2031         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2032         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2033
2034         if (exp->ex_fslocs.migrated) {
2035                 BUG_ON(bmval[2]);
2036                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2037                 if (status)
2038                         goto out;
2039         }
2040
2041         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2042         if (err)
2043                 goto out_nfserr;
2044         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2045                         FATTR4_WORD0_MAXNAME)) ||
2046             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2047                        FATTR4_WORD1_SPACE_TOTAL))) {
2048                 err = vfs_statfs(&path, &statfs);
2049                 if (err)
2050                         goto out_nfserr;
2051         }
2052         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2053                 fh_init(&tempfh, NFS4_FHSIZE);
2054                 status = fh_compose(&tempfh, exp, dentry, NULL);
2055                 if (status)
2056                         goto out;
2057                 fhp = &tempfh;
2058         }
2059         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2060                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2061                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2062                 aclsupport = (err == 0);
2063                 if (bmval0 & FATTR4_WORD0_ACL) {
2064                         if (err == -EOPNOTSUPP)
2065                                 bmval0 &= ~FATTR4_WORD0_ACL;
2066                         else if (err == -EINVAL) {
2067                                 status = nfserr_attrnotsupp;
2068                                 goto out;
2069                         } else if (err != 0)
2070                                 goto out_nfserr;
2071                 }
2072         }
2073
2074         if (bmval2) {
2075                 if ((buflen -= 16) < 0)
2076                         goto out_resource;
2077                 WRITE32(3);
2078                 WRITE32(bmval0);
2079                 WRITE32(bmval1);
2080                 WRITE32(bmval2);
2081         } else if (bmval1) {
2082                 if ((buflen -= 12) < 0)
2083                         goto out_resource;
2084                 WRITE32(2);
2085                 WRITE32(bmval0);
2086                 WRITE32(bmval1);
2087         } else {
2088                 if ((buflen -= 8) < 0)
2089                         goto out_resource;
2090                 WRITE32(1);
2091                 WRITE32(bmval0);
2092         }
2093         attrlenp = p++;                /* to be backfilled later */
2094
2095         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2096                 u32 word0 = nfsd_suppattrs0(minorversion);
2097                 u32 word1 = nfsd_suppattrs1(minorversion);
2098                 u32 word2 = nfsd_suppattrs2(minorversion);
2099
2100                 if (!aclsupport)
2101                         word0 &= ~FATTR4_WORD0_ACL;
2102                 if (!word2) {
2103                         if ((buflen -= 12) < 0)
2104                                 goto out_resource;
2105                         WRITE32(2);
2106                         WRITE32(word0);
2107                         WRITE32(word1);
2108                 } else {
2109                         if ((buflen -= 16) < 0)
2110                                 goto out_resource;
2111                         WRITE32(3);
2112                         WRITE32(word0);
2113                         WRITE32(word1);
2114                         WRITE32(word2);
2115                 }
2116         }
2117         if (bmval0 & FATTR4_WORD0_TYPE) {
2118                 if ((buflen -= 4) < 0)
2119                         goto out_resource;
2120                 dummy = nfs4_file_type(stat.mode);
2121                 if (dummy == NF4BAD)
2122                         goto out_serverfault;
2123                 WRITE32(dummy);
2124         }
2125         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2126                 if ((buflen -= 4) < 0)
2127                         goto out_resource;
2128                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2129                         WRITE32(NFS4_FH_PERSISTENT);
2130                 else
2131                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2132         }
2133         if (bmval0 & FATTR4_WORD0_CHANGE) {
2134                 if ((buflen -= 8) < 0)
2135                         goto out_resource;
2136                 write_change(&p, &stat, dentry->d_inode);
2137         }
2138         if (bmval0 & FATTR4_WORD0_SIZE) {
2139                 if ((buflen -= 8) < 0)
2140                         goto out_resource;
2141                 WRITE64(stat.size);
2142         }
2143         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2144                 if ((buflen -= 4) < 0)
2145                         goto out_resource;
2146                 WRITE32(1);
2147         }
2148         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2149                 if ((buflen -= 4) < 0)
2150                         goto out_resource;
2151                 WRITE32(1);
2152         }
2153         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2154                 if ((buflen -= 4) < 0)
2155                         goto out_resource;
2156                 WRITE32(0);
2157         }
2158         if (bmval0 & FATTR4_WORD0_FSID) {
2159                 if ((buflen -= 16) < 0)
2160                         goto out_resource;
2161                 if (exp->ex_fslocs.migrated) {
2162                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2163                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2164                 } else switch(fsid_source(fhp)) {
2165                 case FSIDSOURCE_FSID:
2166                         WRITE64((u64)exp->ex_fsid);
2167                         WRITE64((u64)0);
2168                         break;
2169                 case FSIDSOURCE_DEV:
2170                         WRITE32(0);
2171                         WRITE32(MAJOR(stat.dev));
2172                         WRITE32(0);
2173                         WRITE32(MINOR(stat.dev));
2174                         break;
2175                 case FSIDSOURCE_UUID:
2176                         WRITEMEM(exp->ex_uuid, 16);
2177                         break;
2178                 }
2179         }
2180         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2181                 if ((buflen -= 4) < 0)
2182                         goto out_resource;
2183                 WRITE32(0);
2184         }
2185         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2186                 if ((buflen -= 4) < 0)
2187                         goto out_resource;
2188                 WRITE32(nfsd4_lease);
2189         }
2190         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2191                 if ((buflen -= 4) < 0)
2192                         goto out_resource;
2193                 WRITE32(rdattr_err);
2194         }
2195         if (bmval0 & FATTR4_WORD0_ACL) {
2196                 struct nfs4_ace *ace;
2197
2198                 if (acl == NULL) {
2199                         if ((buflen -= 4) < 0)
2200                                 goto out_resource;
2201
2202                         WRITE32(0);
2203                         goto out_acl;
2204                 }
2205                 if ((buflen -= 4) < 0)
2206                         goto out_resource;
2207                 WRITE32(acl->naces);
2208
2209                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2210                         if ((buflen -= 4*3) < 0)
2211                                 goto out_resource;
2212                         WRITE32(ace->type);
2213                         WRITE32(ace->flag);
2214                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2215                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
2216                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2217                                 &p, &buflen);
2218                         if (status == nfserr_resource)
2219                                 goto out_resource;
2220                         if (status)
2221                                 goto out;
2222                 }
2223         }
2224 out_acl:
2225         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2226                 if ((buflen -= 4) < 0)
2227                         goto out_resource;
2228                 WRITE32(aclsupport ?
2229                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2230         }
2231         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2232                 if ((buflen -= 4) < 0)
2233                         goto out_resource;
2234                 WRITE32(1);
2235         }
2236         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2237                 if ((buflen -= 4) < 0)
2238                         goto out_resource;
2239                 WRITE32(1);
2240         }
2241         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2242                 if ((buflen -= 4) < 0)
2243                         goto out_resource;
2244                 WRITE32(1);
2245         }
2246         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2247                 if ((buflen -= 4) < 0)
2248                         goto out_resource;
2249                 WRITE32(1);
2250         }
2251         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2252                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2253                 if (buflen < 0)
2254                         goto out_resource;
2255                 WRITE32(fhp->fh_handle.fh_size);
2256                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2257         }
2258         if (bmval0 & FATTR4_WORD0_FILEID) {
2259                 if ((buflen -= 8) < 0)
2260                         goto out_resource;
2261                 WRITE64(stat.ino);
2262         }
2263         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2264                 if ((buflen -= 8) < 0)
2265                         goto out_resource;
2266                 WRITE64((u64) statfs.f_ffree);
2267         }
2268         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2269                 if ((buflen -= 8) < 0)
2270                         goto out_resource;
2271                 WRITE64((u64) statfs.f_ffree);
2272         }
2273         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2274                 if ((buflen -= 8) < 0)
2275                         goto out_resource;
2276                 WRITE64((u64) statfs.f_files);
2277         }
2278         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2279                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2280                 if (status == nfserr_resource)
2281                         goto out_resource;
2282                 if (status)
2283                         goto out;
2284         }
2285         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2286                 if ((buflen -= 4) < 0)
2287                         goto out_resource;
2288                 WRITE32(1);
2289         }
2290         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2291                 if ((buflen -= 8) < 0)
2292                         goto out_resource;
2293                 WRITE64(~(u64)0);
2294         }
2295         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2296                 if ((buflen -= 4) < 0)
2297                         goto out_resource;
2298                 WRITE32(255);
2299         }
2300         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2301                 if ((buflen -= 4) < 0)
2302                         goto out_resource;
2303                 WRITE32(statfs.f_namelen);
2304         }
2305         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2306                 if ((buflen -= 8) < 0)
2307                         goto out_resource;
2308                 WRITE64((u64) svc_max_payload(rqstp));
2309         }
2310         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2311                 if ((buflen -= 8) < 0)
2312                         goto out_resource;
2313                 WRITE64((u64) svc_max_payload(rqstp));
2314         }
2315         if (bmval1 & FATTR4_WORD1_MODE) {
2316                 if ((buflen -= 4) < 0)
2317                         goto out_resource;
2318                 WRITE32(stat.mode & S_IALLUGO);
2319         }
2320         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2321                 if ((buflen -= 4) < 0)
2322                         goto out_resource;
2323                 WRITE32(1);
2324         }
2325         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2326                 if ((buflen -= 4) < 0)
2327                         goto out_resource;
2328                 WRITE32(stat.nlink);
2329         }
2330         if (bmval1 & FATTR4_WORD1_OWNER) {
2331                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2332                 if (status == nfserr_resource)
2333                         goto out_resource;
2334                 if (status)
2335                         goto out;
2336         }
2337         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2338                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2339                 if (status == nfserr_resource)
2340                         goto out_resource;
2341                 if (status)
2342                         goto out;
2343         }
2344         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2345                 if ((buflen -= 8) < 0)
2346                         goto out_resource;
2347                 WRITE32((u32) MAJOR(stat.rdev));
2348                 WRITE32((u32) MINOR(stat.rdev));
2349         }
2350         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2351                 if ((buflen -= 8) < 0)
2352                         goto out_resource;
2353                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2354                 WRITE64(dummy64);
2355         }
2356         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2357                 if ((buflen -= 8) < 0)
2358                         goto out_resource;
2359                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2360                 WRITE64(dummy64);
2361         }
2362         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2363                 if ((buflen -= 8) < 0)
2364                         goto out_resource;
2365                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2366                 WRITE64(dummy64);
2367         }
2368         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2369                 if ((buflen -= 8) < 0)
2370                         goto out_resource;
2371                 dummy64 = (u64)stat.blocks << 9;
2372                 WRITE64(dummy64);
2373         }
2374         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2375                 if ((buflen -= 12) < 0)
2376                         goto out_resource;
2377                 WRITE32(0);
2378                 WRITE32(stat.atime.tv_sec);
2379                 WRITE32(stat.atime.tv_nsec);
2380         }
2381         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2382                 if ((buflen -= 12) < 0)
2383                         goto out_resource;
2384                 WRITE32(0);
2385                 WRITE32(1);
2386                 WRITE32(0);
2387         }
2388         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2389                 if ((buflen -= 12) < 0)
2390                         goto out_resource;
2391                 WRITE32(0);
2392                 WRITE32(stat.ctime.tv_sec);
2393                 WRITE32(stat.ctime.tv_nsec);
2394         }
2395         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2396                 if ((buflen -= 12) < 0)
2397                         goto out_resource;
2398                 WRITE32(0);
2399                 WRITE32(stat.mtime.tv_sec);
2400                 WRITE32(stat.mtime.tv_nsec);
2401         }
2402         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2403                 if ((buflen -= 8) < 0)
2404                         goto out_resource;
2405                 /*
2406                  * Get parent's attributes if not ignoring crossmount
2407                  * and this is the root of a cross-mounted filesystem.
2408                  */
2409                 if (ignore_crossmnt == 0 &&
2410                     dentry == exp->ex_path.mnt->mnt_root) {
2411                         struct path path = exp->ex_path;
2412                         path_get(&path);
2413                         while (follow_up(&path)) {
2414                                 if (path.dentry != path.mnt->mnt_root)
2415                                         break;
2416                         }
2417                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2418                         path_put(&path);
2419                         if (err)
2420                                 goto out_nfserr;
2421                 }
2422                 WRITE64(stat.ino);
2423         }
2424         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2425                 WRITE32(3);
2426                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2427                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2428                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2429         }
2430
2431         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2432         *countp = p - buffer;
2433         status = nfs_ok;
2434
2435 out:
2436         kfree(acl);
2437         if (fhp == &tempfh)
2438                 fh_put(&tempfh);
2439         return status;
2440 out_nfserr:
2441         status = nfserrno(err);
2442         goto out;
2443 out_resource:
2444         *countp = 0;
2445         status = nfserr_resource;
2446         goto out;
2447 out_serverfault:
2448         status = nfserr_serverfault;
2449         goto out;
2450 }
2451
2452 static inline int attributes_need_mount(u32 *bmval)
2453 {
2454         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2455                 return 1;
2456         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2457                 return 1;
2458         return 0;
2459 }
2460
2461 static __be32
2462 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2463                 const char *name, int namlen, __be32 *p, int *buflen)
2464 {
2465         struct svc_export *exp = cd->rd_fhp->fh_export;
2466         struct dentry *dentry;
2467         __be32 nfserr;
2468         int ignore_crossmnt = 0;
2469
2470         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2471         if (IS_ERR(dentry))
2472                 return nfserrno(PTR_ERR(dentry));
2473         if (!dentry->d_inode) {
2474                 /*
2475                  * nfsd_buffered_readdir drops the i_mutex between
2476                  * readdir and calling this callback, leaving a window
2477                  * where this directory entry could have gone away.
2478                  */
2479                 dput(dentry);
2480                 return nfserr_noent;
2481         }
2482
2483         exp_get(exp);
2484         /*
2485          * In the case of a mountpoint, the client may be asking for
2486          * attributes that are only properties of the underlying filesystem
2487          * as opposed to the cross-mounted file system. In such a case,
2488          * we will not follow the cross mount and will fill the attribtutes
2489          * directly from the mountpoint dentry.
2490          */
2491         if (nfsd_mountpoint(dentry, exp)) {
2492                 int err;
2493
2494                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2495                                 && !attributes_need_mount(cd->rd_bmval)) {
2496                         ignore_crossmnt = 1;
2497                         goto out_encode;
2498                 }
2499                 /*
2500                  * Why the heck aren't we just using nfsd_lookup??
2501                  * Different "."/".." handling?  Something else?
2502                  * At least, add a comment here to explain....
2503                  */
2504                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2505                 if (err) {
2506                         nfserr = nfserrno(err);
2507                         goto out_put;
2508                 }
2509                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2510                 if (nfserr)
2511                         goto out_put;
2512
2513         }
2514 out_encode:
2515         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2516                                         cd->rd_rqstp, ignore_crossmnt);
2517 out_put:
2518         dput(dentry);
2519         exp_put(exp);
2520         return nfserr;
2521 }
2522
2523 static __be32 *
2524 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2525 {
2526         __be32 *attrlenp;
2527
2528         if (buflen < 6)
2529                 return NULL;
2530         *p++ = htonl(2);
2531         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2532         *p++ = htonl(0);                         /* bmval1 */
2533
2534         attrlenp = p++;
2535         *p++ = nfserr;       /* no htonl */
2536         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2537         return p;
2538 }
2539
2540 static int
2541 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2542                     loff_t offset, u64 ino, unsigned int d_type)
2543 {
2544         struct readdir_cd *ccd = ccdv;
2545         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2546         int buflen;
2547         __be32 *p = cd->buffer;
2548         __be32 *cookiep;
2549         __be32 nfserr = nfserr_toosmall;
2550
2551         /* In nfsv4, "." and ".." never make it onto the wire.. */
2552         if (name && isdotent(name, namlen)) {
2553                 cd->common.err = nfs_ok;
2554                 return 0;
2555         }
2556
2557         if (cd->offset)
2558                 xdr_encode_hyper(cd->offset, (u64) offset);
2559
2560         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2561         if (buflen < 0)
2562                 goto fail;
2563
2564         *p++ = xdr_one;                             /* mark entry present */
2565         cookiep = p;
2566         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2567         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2568
2569         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2570         switch (nfserr) {
2571         case nfs_ok:
2572                 p += buflen;
2573                 break;
2574         case nfserr_resource:
2575                 nfserr = nfserr_toosmall;
2576                 goto fail;
2577         case nfserr_noent:
2578                 goto skip_entry;
2579         default:
2580                 /*
2581                  * If the client requested the RDATTR_ERROR attribute,
2582                  * we stuff the error code into this attribute
2583                  * and continue.  If this attribute was not requested,
2584                  * then in accordance with the spec, we fail the
2585                  * entire READDIR operation(!)
2586                  */
2587                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2588                         goto fail;
2589                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2590                 if (p == NULL) {
2591                         nfserr = nfserr_toosmall;
2592                         goto fail;
2593                 }
2594         }
2595         cd->buflen -= (p - cd->buffer);
2596         cd->buffer = p;
2597         cd->offset = cookiep;
2598 skip_entry:
2599         cd->common.err = nfs_ok;
2600         return 0;
2601 fail:
2602         cd->common.err = nfserr;
2603         return -EINVAL;
2604 }
2605
2606 static void
2607 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2608 {
2609         __be32 *p;
2610
2611         RESERVE_SPACE(sizeof(stateid_t));
2612         WRITE32(sid->si_generation);
2613         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2614         ADJUST_ARGS();
2615 }
2616
2617 static __be32
2618 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2619 {
2620         __be32 *p;
2621
2622         if (!nfserr) {
2623                 RESERVE_SPACE(8);
2624                 WRITE32(access->ac_supported);
2625                 WRITE32(access->ac_resp_access);
2626                 ADJUST_ARGS();
2627         }
2628         return nfserr;
2629 }
2630
2631 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2632 {
2633         __be32 *p;
2634
2635         if (!nfserr) {
2636                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2637                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2638                 WRITE32(bcts->dir);
2639                 /* XXX: ? */
2640                 WRITE32(0);
2641                 ADJUST_ARGS();
2642         }
2643         return nfserr;
2644 }
2645
2646 static __be32
2647 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2648 {
2649         ENCODE_SEQID_OP_HEAD;
2650
2651         if (!nfserr)
2652                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2653
2654         encode_seqid_op_tail(resp, save, nfserr);
2655         return nfserr;
2656 }
2657
2658
2659 static __be32
2660 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2661 {
2662         __be32 *p;
2663
2664         if (!nfserr) {
2665                 RESERVE_SPACE(8);
2666                 WRITEMEM(commit->co_verf.data, 8);
2667                 ADJUST_ARGS();
2668         }
2669         return nfserr;
2670 }
2671
2672 static __be32
2673 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2674 {
2675         __be32 *p;
2676
2677         if (!nfserr) {
2678                 RESERVE_SPACE(32);
2679                 write_cinfo(&p, &create->cr_cinfo);
2680                 WRITE32(2);
2681                 WRITE32(create->cr_bmval[0]);
2682                 WRITE32(create->cr_bmval[1]);
2683                 ADJUST_ARGS();
2684         }
2685         return nfserr;
2686 }
2687
2688 static __be32
2689 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2690 {
2691         struct svc_fh *fhp = getattr->ga_fhp;
2692         int buflen;
2693
2694         if (nfserr)
2695                 return nfserr;
2696
2697         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2698         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2699                                     resp->p, &buflen, getattr->ga_bmval,
2700                                     resp->rqstp, 0);
2701         if (!nfserr)
2702                 resp->p += buflen;
2703         return nfserr;
2704 }
2705
2706 static __be32
2707 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2708 {
2709         struct svc_fh *fhp = *fhpp;
2710         unsigned int len;
2711         __be32 *p;
2712
2713         if (!nfserr) {
2714                 len = fhp->fh_handle.fh_size;
2715                 RESERVE_SPACE(len + 4);
2716                 WRITE32(len);
2717                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2718                 ADJUST_ARGS();
2719         }
2720         return nfserr;
2721 }
2722
2723 /*
2724 * Including all fields other than the name, a LOCK4denied structure requires
2725 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2726 */
2727 static void
2728 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2729 {
2730         struct xdr_netobj *conf = &ld->ld_owner;
2731         __be32 *p;
2732
2733         RESERVE_SPACE(32 + XDR_LEN(conf->len));
2734         WRITE64(ld->ld_start);
2735         WRITE64(ld->ld_length);
2736         WRITE32(ld->ld_type);
2737         if (conf->len) {
2738                 WRITEMEM(&ld->ld_clientid, 8);
2739                 WRITE32(conf->len);
2740                 WRITEMEM(conf->data, conf->len);
2741                 kfree(conf->data);
2742         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2743                 WRITE64((u64)0); /* clientid */
2744                 WRITE32(0); /* length of owner name */
2745         }
2746         ADJUST_ARGS();
2747 }
2748
2749 static __be32
2750 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2751 {
2752         ENCODE_SEQID_OP_HEAD;
2753
2754         if (!nfserr)
2755                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2756         else if (nfserr == nfserr_denied)
2757                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2758
2759         encode_seqid_op_tail(resp, save, nfserr);
2760         return nfserr;
2761 }
2762
2763 static __be32
2764 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2765 {
2766         if (nfserr == nfserr_denied)
2767                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2768         return nfserr;
2769 }
2770
2771 static __be32
2772 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2773 {
2774         ENCODE_SEQID_OP_HEAD;
2775
2776         if (!nfserr)
2777                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2778
2779         encode_seqid_op_tail(resp, save, nfserr);
2780         return nfserr;
2781 }
2782
2783
2784 static __be32
2785 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2786 {
2787         __be32 *p;
2788
2789         if (!nfserr) {
2790                 RESERVE_SPACE(20);
2791                 write_cinfo(&p, &link->li_cinfo);
2792                 ADJUST_ARGS();
2793         }
2794         return nfserr;
2795 }
2796
2797
2798 static __be32
2799 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2800 {
2801         __be32 *p;
2802         ENCODE_SEQID_OP_HEAD;
2803
2804         if (nfserr)
2805                 goto out;
2806
2807         nfsd4_encode_stateid(resp, &open->op_stateid);
2808         RESERVE_SPACE(40);
2809         write_cinfo(&p, &open->op_cinfo);
2810         WRITE32(open->op_rflags);
2811         WRITE32(2);
2812         WRITE32(open->op_bmval[0]);
2813         WRITE32(open->op_bmval[1]);
2814         WRITE32(open->op_delegate_type);
2815         ADJUST_ARGS();
2816
2817         switch (open->op_delegate_type) {
2818         case NFS4_OPEN_DELEGATE_NONE:
2819                 break;
2820         case NFS4_OPEN_DELEGATE_READ:
2821                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2822                 RESERVE_SPACE(20);
2823                 WRITE32(open->op_recall);
2824
2825                 /*
2826                  * TODO: ACE's in delegations
2827                  */
2828                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2829                 WRITE32(0);
2830                 WRITE32(0);
2831                 WRITE32(0);   /* XXX: is NULL principal ok? */
2832                 ADJUST_ARGS();
2833                 break;
2834         case NFS4_OPEN_DELEGATE_WRITE:
2835                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2836                 RESERVE_SPACE(32);
2837                 WRITE32(0);
2838
2839                 /*
2840                  * TODO: space_limit's in delegations
2841                  */
2842                 WRITE32(NFS4_LIMIT_SIZE);
2843                 WRITE32(~(u32)0);
2844                 WRITE32(~(u32)0);
2845
2846                 /*
2847                  * TODO: ACE's in delegations
2848                  */
2849                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2850                 WRITE32(0);
2851                 WRITE32(0);
2852                 WRITE32(0);   /* XXX: is NULL principal ok? */
2853                 ADJUST_ARGS();
2854                 break;
2855         default:
2856                 BUG();
2857         }
2858         /* XXX save filehandle here */
2859 out:
2860         encode_seqid_op_tail(resp, save, nfserr);
2861         return nfserr;
2862 }
2863
2864 static __be32
2865 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2866 {
2867         ENCODE_SEQID_OP_HEAD;
2868
2869         if (!nfserr)
2870                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2871
2872         encode_seqid_op_tail(resp, save, nfserr);
2873         return nfserr;
2874 }
2875
2876 static __be32
2877 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2878 {
2879         ENCODE_SEQID_OP_HEAD;
2880
2881         if (!nfserr)
2882                 nfsd4_encode_stateid(resp, &od->od_stateid);
2883
2884         encode_seqid_op_tail(resp, save, nfserr);
2885         return nfserr;
2886 }
2887
2888 static __be32
2889 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2890                   struct nfsd4_read *read)
2891 {
2892         u32 eof;
2893         int v, pn;
2894         unsigned long maxcount;
2895         long len;
2896         __be32 *p;
2897
2898         if (nfserr)
2899                 return nfserr;
2900         if (resp->xbuf->page_len)
2901                 return nfserr_resource;
2902
2903         RESERVE_SPACE(8); /* eof flag and byte count */
2904
2905         maxcount = svc_max_payload(resp->rqstp);
2906         if (maxcount > read->rd_length)
2907                 maxcount = read->rd_length;
2908
2909         len = maxcount;
2910         v = 0;
2911         while (len > 0) {
2912                 pn = resp->rqstp->rq_resused++;
2913                 resp->rqstp->rq_vec[v].iov_base =
2914                         page_address(resp->rqstp->rq_respages[pn]);
2915                 resp->rqstp->rq_vec[v].iov_len =
2916                         len < PAGE_SIZE ? len : PAGE_SIZE;
2917                 v++;
2918                 len -= PAGE_SIZE;
2919         }
2920         read->rd_vlen = v;
2921
2922         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2923                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2924                         &maxcount);
2925
2926         if (nfserr)
2927                 return nfserr;
2928         eof = (read->rd_offset + maxcount >=
2929                read->rd_fhp->fh_dentry->d_inode->i_size);
2930
2931         WRITE32(eof);
2932         WRITE32(maxcount);
2933         ADJUST_ARGS();
2934         resp->xbuf->head[0].iov_len = (char*)p
2935                                         - (char*)resp->xbuf->head[0].iov_base;
2936         resp->xbuf->page_len = maxcount;
2937
2938         /* Use rest of head for padding and remaining ops: */
2939         resp->xbuf->tail[0].iov_base = p;
2940         resp->xbuf->tail[0].iov_len = 0;
2941         if (maxcount&3) {
2942                 RESERVE_SPACE(4);
2943                 WRITE32(0);
2944                 resp->xbuf->tail[0].iov_base += maxcount&3;
2945                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2946                 ADJUST_ARGS();
2947         }
2948         return 0;
2949 }
2950
2951 static __be32
2952 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2953 {
2954         int maxcount;
2955         char *page;
2956         __be32 *p;
2957
2958         if (nfserr)
2959                 return nfserr;
2960         if (resp->xbuf->page_len)
2961                 return nfserr_resource;
2962
2963         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2964
2965         maxcount = PAGE_SIZE;
2966         RESERVE_SPACE(4);
2967
2968         /*
2969          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2970          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2971          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2972          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2973          */
2974         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2975         if (nfserr == nfserr_isdir)
2976                 return nfserr_inval;
2977         if (nfserr)
2978                 return nfserr;
2979
2980         WRITE32(maxcount);
2981         ADJUST_ARGS();
2982         resp->xbuf->head[0].iov_len = (char*)p
2983                                 - (char*)resp->xbuf->head[0].iov_base;
2984         resp->xbuf->page_len = maxcount;
2985
2986         /* Use rest of head for padding and remaining ops: */
2987         resp->xbuf->tail[0].iov_base = p;
2988         resp->xbuf->tail[0].iov_len = 0;
2989         if (maxcount&3) {
2990                 RESERVE_SPACE(4);
2991                 WRITE32(0);
2992                 resp->xbuf->tail[0].iov_base += maxcount&3;
2993                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2994                 ADJUST_ARGS();
2995         }
2996         return 0;
2997 }
2998
2999 static __be32
3000 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3001 {
3002         int maxcount;
3003         loff_t offset;
3004         __be32 *page, *savep, *tailbase;
3005         __be32 *p;
3006
3007         if (nfserr)
3008                 return nfserr;
3009         if (resp->xbuf->page_len)
3010                 return nfserr_resource;
3011
3012         RESERVE_SPACE(8);  /* verifier */
3013         savep = p;
3014
3015         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3016         WRITE32(0);
3017         WRITE32(0);
3018         ADJUST_ARGS();
3019         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3020         tailbase = p;
3021
3022         maxcount = PAGE_SIZE;
3023         if (maxcount > readdir->rd_maxcount)
3024                 maxcount = readdir->rd_maxcount;
3025
3026         /*
3027          * Convert from bytes to words, account for the two words already
3028          * written, make sure to leave two words at the end for the next
3029          * pointer and eof field.
3030          */
3031         maxcount = (maxcount >> 2) - 4;
3032         if (maxcount < 0) {
3033                 nfserr =  nfserr_toosmall;
3034                 goto err_no_verf;
3035         }
3036
3037         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3038         readdir->common.err = 0;
3039         readdir->buflen = maxcount;
3040         readdir->buffer = page;
3041         readdir->offset = NULL;
3042
3043         offset = readdir->rd_cookie;
3044         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3045                               &offset,
3046                               &readdir->common, nfsd4_encode_dirent);
3047         if (nfserr == nfs_ok &&
3048             readdir->common.err == nfserr_toosmall &&
3049             readdir->buffer == page)
3050                 nfserr = nfserr_toosmall;
3051         if (nfserr)
3052                 goto err_no_verf;
3053
3054         if (readdir->offset)
3055                 xdr_encode_hyper(readdir->offset, offset);
3056
3057         p = readdir->buffer;
3058         *p++ = 0;       /* no more entries */
3059         *p++ = htonl(readdir->common.err == nfserr_eof);
3060         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
3061                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
3062
3063         /* Use rest of head for padding and remaining ops: */
3064         resp->xbuf->tail[0].iov_base = tailbase;
3065         resp->xbuf->tail[0].iov_len = 0;
3066         resp->p = resp->xbuf->tail[0].iov_base;
3067         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3068
3069         return 0;
3070 err_no_verf:
3071         p = savep;
3072         ADJUST_ARGS();
3073         return nfserr;
3074 }
3075
3076 static __be32
3077 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3078 {
3079         __be32 *p;
3080
3081         if (!nfserr) {
3082                 RESERVE_SPACE(20);
3083                 write_cinfo(&p, &remove->rm_cinfo);
3084                 ADJUST_ARGS();
3085         }
3086         return nfserr;
3087 }
3088
3089 static __be32
3090 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3091 {
3092         __be32 *p;
3093
3094         if (!nfserr) {
3095                 RESERVE_SPACE(40);
3096                 write_cinfo(&p, &rename->rn_sinfo);
3097                 write_cinfo(&p, &rename->rn_tinfo);
3098                 ADJUST_ARGS();
3099         }
3100         return nfserr;
3101 }
3102
3103 static __be32
3104 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3105                          __be32 nfserr,struct svc_export *exp)
3106 {
3107         int i = 0;
3108         u32 nflavs;
3109         struct exp_flavor_info *flavs;
3110         struct exp_flavor_info def_flavs[2];
3111         __be32 *p;
3112
3113         if (nfserr)
3114                 goto out;
3115         if (exp->ex_nflavors) {
3116                 flavs = exp->ex_flavors;
3117                 nflavs = exp->ex_nflavors;
3118         } else { /* Handling of some defaults in absence of real secinfo: */
3119                 flavs = def_flavs;
3120                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3121                         nflavs = 2;
3122                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3123                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
3124                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3125                         nflavs = 1;
3126                         flavs[0].pseudoflavor
3127                                         = svcauth_gss_flavor(exp->ex_client);
3128                 } else {
3129                         nflavs = 1;
3130                         flavs[0].pseudoflavor
3131                                         = exp->ex_client->flavour->flavour;
3132                 }
3133         }
3134
3135         RESERVE_SPACE(4);
3136         WRITE32(nflavs);
3137         ADJUST_ARGS();
3138         for (i = 0; i < nflavs; i++) {
3139                 u32 flav = flavs[i].pseudoflavor;
3140                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3141
3142                 if (gm) {
3143                         RESERVE_SPACE(4);
3144                         WRITE32(RPC_AUTH_GSS);
3145                         ADJUST_ARGS();
3146                         RESERVE_SPACE(4 + gm->gm_oid.len);
3147                         WRITE32(gm->gm_oid.len);
3148                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3149                         ADJUST_ARGS();
3150                         RESERVE_SPACE(4);
3151                         WRITE32(0); /* qop */
3152                         ADJUST_ARGS();
3153                         RESERVE_SPACE(4);
3154                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
3155                         ADJUST_ARGS();
3156                         gss_mech_put(gm);
3157                 } else {
3158                         RESERVE_SPACE(4);
3159                         WRITE32(flav);
3160                         ADJUST_ARGS();
3161                 }
3162         }
3163 out:
3164         if (exp)
3165                 exp_put(exp);
3166         return nfserr;
3167 }
3168
3169 static __be32
3170 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3171                      struct nfsd4_secinfo *secinfo)
3172 {
3173         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3174 }
3175
3176 static __be32
3177 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3178                      struct nfsd4_secinfo_no_name *secinfo)
3179 {
3180         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3181 }
3182
3183 /*
3184  * The SETATTR encode routine is special -- it always encodes a bitmap,
3185  * regardless of the error status.
3186  */
3187 static __be32
3188 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3189 {
3190         __be32 *p;
3191
3192         RESERVE_SPACE(12);
3193         if (nfserr) {
3194                 WRITE32(2);
3195                 WRITE32(0);
3196                 WRITE32(0);
3197         }
3198         else {
3199                 WRITE32(2);
3200                 WRITE32(setattr->sa_bmval[0]);
3201                 WRITE32(setattr->sa_bmval[1]);
3202         }
3203         ADJUST_ARGS();
3204         return nfserr;
3205 }
3206
3207 static __be32
3208 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3209 {
3210         __be32 *p;
3211
3212         if (!nfserr) {
3213                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
3214                 WRITEMEM(&scd->se_clientid, 8);
3215                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
3216                 ADJUST_ARGS();
3217         }
3218         else if (nfserr == nfserr_clid_inuse) {
3219                 RESERVE_SPACE(8);
3220                 WRITE32(0);
3221                 WRITE32(0);
3222                 ADJUST_ARGS();
3223         }
3224         return nfserr;
3225 }
3226
3227 static __be32
3228 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3229 {
3230         __be32 *p;
3231
3232         if (!nfserr) {
3233                 RESERVE_SPACE(16);
3234                 WRITE32(write->wr_bytes_written);
3235                 WRITE32(write->wr_how_written);
3236                 WRITEMEM(write->wr_verifier.data, 8);
3237                 ADJUST_ARGS();
3238         }
3239         return nfserr;
3240 }
3241
3242 static __be32
3243 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3244                          struct nfsd4_exchange_id *exid)
3245 {
3246         __be32 *p;
3247         char *major_id;
3248         char *server_scope;
3249         int major_id_sz;
3250         int server_scope_sz;
3251         uint64_t minor_id = 0;
3252
3253         if (nfserr)
3254                 return nfserr;
3255
3256         major_id = utsname()->nodename;
3257         major_id_sz = strlen(major_id);
3258         server_scope = utsname()->nodename;
3259         server_scope_sz = strlen(server_scope);
3260
3261         RESERVE_SPACE(
3262                 8 /* eir_clientid */ +
3263                 4 /* eir_sequenceid */ +
3264                 4 /* eir_flags */ +
3265                 4 /* spr_how (SP4_NONE) */ +
3266                 8 /* so_minor_id */ +
3267                 4 /* so_major_id.len */ +
3268                 (XDR_QUADLEN(major_id_sz) * 4) +
3269                 4 /* eir_server_scope.len */ +
3270                 (XDR_QUADLEN(server_scope_sz) * 4) +
3271                 4 /* eir_server_impl_id.count (0) */);
3272
3273         WRITEMEM(&exid->clientid, 8);
3274         WRITE32(exid->seqid);
3275         WRITE32(exid->flags);
3276
3277         /* state_protect4_r. Currently only support SP4_NONE */
3278         BUG_ON(exid->spa_how != SP4_NONE);
3279         WRITE32(exid->spa_how);
3280
3281         /* The server_owner struct */
3282         WRITE64(minor_id);      /* Minor id */
3283         /* major id */
3284         WRITE32(major_id_sz);
3285         WRITEMEM(major_id, major_id_sz);
3286
3287         /* Server scope */
3288         WRITE32(server_scope_sz);
3289         WRITEMEM(server_scope, server_scope_sz);
3290
3291         /* Implementation id */
3292         WRITE32(0);     /* zero length nfs_impl_id4 array */
3293         ADJUST_ARGS();
3294         return 0;
3295 }
3296
3297 static __be32
3298 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3299                             struct nfsd4_create_session *sess)
3300 {
3301         __be32 *p;
3302
3303         if (nfserr)
3304                 return nfserr;
3305
3306         RESERVE_SPACE(24);
3307         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3308         WRITE32(sess->seqid);
3309         WRITE32(sess->flags);
3310         ADJUST_ARGS();
3311
3312         RESERVE_SPACE(28);
3313         WRITE32(0); /* headerpadsz */
3314         WRITE32(sess->fore_channel.maxreq_sz);
3315         WRITE32(sess->fore_channel.maxresp_sz);
3316         WRITE32(sess->fore_channel.maxresp_cached);
3317         WRITE32(sess->fore_channel.maxops);
3318         WRITE32(sess->fore_channel.maxreqs);
3319         WRITE32(sess->fore_channel.nr_rdma_attrs);
3320         ADJUST_ARGS();
3321
3322         if (sess->fore_channel.nr_rdma_attrs) {
3323                 RESERVE_SPACE(4);
3324                 WRITE32(sess->fore_channel.rdma_attrs);
3325                 ADJUST_ARGS();
3326         }
3327
3328         RESERVE_SPACE(28);
3329         WRITE32(0); /* headerpadsz */
3330         WRITE32(sess->back_channel.maxreq_sz);
3331         WRITE32(sess->back_channel.maxresp_sz);
3332         WRITE32(sess->back_channel.maxresp_cached);
3333         WRITE32(sess->back_channel.maxops);
3334         WRITE32(sess->back_channel.maxreqs);
3335         WRITE32(sess->back_channel.nr_rdma_attrs);
3336         ADJUST_ARGS();
3337
3338         if (sess->back_channel.nr_rdma_attrs) {
3339                 RESERVE_SPACE(4);
3340                 WRITE32(sess->back_channel.rdma_attrs);
3341                 ADJUST_ARGS();
3342         }
3343         return 0;
3344 }
3345
3346 static __be32
3347 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3348                              struct nfsd4_destroy_session *destroy_session)
3349 {
3350         return nfserr;
3351 }
3352
3353 static __be32
3354 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, int nfserr,
3355                           struct nfsd4_free_stateid *free_stateid)
3356 {
3357         __be32 *p;
3358
3359         if (nfserr)
3360                 return nfserr;
3361
3362         RESERVE_SPACE(4);
3363         WRITE32(nfserr);
3364         ADJUST_ARGS();
3365         return nfserr;
3366 }
3367
3368 static __be32
3369 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3370                       struct nfsd4_sequence *seq)
3371 {
3372         __be32 *p;
3373
3374         if (nfserr)
3375                 return nfserr;
3376
3377         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3378         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3379         WRITE32(seq->seqid);
3380         WRITE32(seq->slotid);
3381         /* Note slotid's are numbered from zero: */
3382         WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3383         WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3384         WRITE32(seq->status_flags);
3385
3386         ADJUST_ARGS();
3387         resp->cstate.datap = p; /* DRC cache data pointer */
3388         return 0;
3389 }
3390
3391 __be32
3392 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, int nfserr,
3393                           struct nfsd4_test_stateid *test_stateid)
3394 {
3395         struct nfsd4_compoundargs *argp;
3396         struct nfs4_client *cl = resp->cstate.session->se_client;
3397         stateid_t si;
3398         __be32 *p;
3399         int i;
3400         int valid;
3401
3402         restore_buf(test_stateid->ts_saved_args, &test_stateid->ts_savedp);
3403         argp = test_stateid->ts_saved_args;
3404
3405         RESERVE_SPACE(4);
3406         *p++ = htonl(test_stateid->ts_num_ids);
3407         resp->p = p;
3408
3409         nfs4_lock_state();
3410         for (i = 0; i < test_stateid->ts_num_ids; i++) {
3411                 nfsd4_decode_stateid(argp, &si);
3412                 valid = nfs4_validate_stateid(cl, &si);
3413                 RESERVE_SPACE(4);
3414                 *p++ = htonl(valid);
3415                 resp->p = p;
3416         }
3417         nfs4_unlock_state();
3418
3419         return nfserr;
3420 }
3421
3422 static __be32
3423 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3424 {
3425         return nfserr;
3426 }
3427
3428 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3429
3430 /*
3431  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3432  * since we don't need to filter out obsolete ops as this is
3433  * done in the decoding phase.
3434  */
3435 static nfsd4_enc nfsd4_enc_ops[] = {
3436         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3437         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3438         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3439         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3440         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3441         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3442         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3443         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3444         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3445         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3446         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3447         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3448         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3449         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3450         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3451         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3452         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3453         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3454         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3455         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3456         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3457         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3458         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3459         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3460         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3461         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3462         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3463         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3464         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3465         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3466         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3467         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3468         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3469         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3470         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3471         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3472         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3473
3474         /* NFSv4.1 operations */
3475         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3476         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3477         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3478         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3479         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3480         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3481         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3482         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3483         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3484         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3485         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3486         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3487         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3488         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3489         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3490         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3491         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3492         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3493         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3494 };
3495
3496 /*
3497  * Calculate the total amount of memory that the compound response has taken
3498  * after encoding the current operation with pad.
3499  *
3500  * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3501  *      which was specified at nfsd4_operation, else pad is zero.
3502  *
3503  * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3504  *
3505  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3506  * will be at least a page and will therefore hold the xdr_buf head.
3507  */
3508 int nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3509 {
3510         struct xdr_buf *xb = &resp->rqstp->rq_res;
3511         struct nfsd4_session *session = NULL;
3512         struct nfsd4_slot *slot = resp->cstate.slot;
3513         u32 length, tlen = 0;
3514
3515         if (!nfsd4_has_session(&resp->cstate))
3516                 return 0;
3517
3518         session = resp->cstate.session;
3519         if (session == NULL)
3520                 return 0;
3521
3522         if (xb->page_len == 0) {
3523                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3524         } else {
3525                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3526                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3527
3528                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3529         }
3530         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3531                 length, xb->page_len, tlen, pad);
3532
3533         if (length > session->se_fchannel.maxresp_sz)
3534                 return nfserr_rep_too_big;
3535
3536         if (slot->sl_cachethis == 1 &&
3537             length > session->se_fchannel.maxresp_cached)
3538                 return nfserr_rep_too_big_to_cache;
3539
3540         return 0;
3541 }
3542
3543 void
3544 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3545 {
3546         __be32 *statp;
3547         __be32 *p;
3548
3549         RESERVE_SPACE(8);
3550         WRITE32(op->opnum);
3551         statp = p++;    /* to be backfilled at the end */
3552         ADJUST_ARGS();
3553
3554         if (op->opnum == OP_ILLEGAL)
3555                 goto status;
3556         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3557                !nfsd4_enc_ops[op->opnum]);
3558         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3559         /* nfsd4_check_drc_limit guarantees enough room for error status */
3560         if (!op->status)
3561                 op->status = nfsd4_check_resp_size(resp, 0);
3562 status:
3563         /*
3564          * Note: We write the status directly, instead of using WRITE32(),
3565          * since it is already in network byte order.
3566          */
3567         *statp = op->status;
3568 }
3569
3570 /*
3571  * Encode the reply stored in the stateowner reply cache
3572  *
3573  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3574  * previously sent already encoded operation.
3575  *
3576  * called with nfs4_lock_state() held
3577  */
3578 void
3579 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3580 {
3581         __be32 *p;
3582         struct nfs4_replay *rp = op->replay;
3583
3584         BUG_ON(!rp);
3585
3586         RESERVE_SPACE(8);
3587         WRITE32(op->opnum);
3588         *p++ = rp->rp_status;  /* already xdr'ed */
3589         ADJUST_ARGS();
3590
3591         RESERVE_SPACE(rp->rp_buflen);
3592         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3593         ADJUST_ARGS();
3594 }
3595
3596 int
3597 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3598 {
3599         return xdr_ressize_check(rqstp, p);
3600 }
3601
3602 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3603 {
3604         struct svc_rqst *rqstp = rq;
3605         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3606
3607         if (args->ops != args->iops) {
3608                 kfree(args->ops);
3609                 args->ops = args->iops;
3610         }
3611         kfree(args->tmpp);
3612         args->tmpp = NULL;
3613         while (args->to_free) {
3614                 struct tmpbuf *tb = args->to_free;
3615                 args->to_free = tb->next;
3616                 tb->release(tb->buf);
3617                 kfree(tb);
3618         }
3619         return 1;
3620 }
3621
3622 int
3623 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3624 {
3625         args->p = p;
3626         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3627         args->pagelist = rqstp->rq_arg.pages;
3628         args->pagelen = rqstp->rq_arg.page_len;
3629         args->tmpp = NULL;
3630         args->to_free = NULL;
3631         args->ops = args->iops;
3632         args->rqstp = rqstp;
3633
3634         return !nfsd4_decode_compound(args);
3635 }
3636
3637 int
3638 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3639 {
3640         /*
3641          * All that remains is to write the tag and operation count...
3642          */
3643         struct nfsd4_compound_state *cs = &resp->cstate;
3644         struct kvec *iov;
3645         p = resp->tagp;
3646         *p++ = htonl(resp->taglen);
3647         memcpy(p, resp->tag, resp->taglen);
3648         p += XDR_QUADLEN(resp->taglen);
3649         *p++ = htonl(resp->opcnt);
3650
3651         if (rqstp->rq_res.page_len)
3652                 iov = &rqstp->rq_res.tail[0];
3653         else
3654                 iov = &rqstp->rq_res.head[0];
3655         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3656         BUG_ON(iov->iov_len > PAGE_SIZE);
3657         if (nfsd4_has_session(cs)) {
3658                 if (cs->status != nfserr_replay_cache) {
3659                         nfsd4_store_cache_entry(resp);
3660                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3661                         cs->slot->sl_inuse = false;
3662                 }
3663                 /* Renew the clientid on success and on replay */
3664                 release_session_client(cs->session);
3665                 nfsd4_put_session(cs->session);
3666         }
3667         return 1;
3668 }
3669
3670 /*
3671  * Local variables:
3672  *  c-basic-offset: 8
3673  * End:
3674  */