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         close->cl_stateowner = NULL;
 460         READ_BUF(4);
 461         READ32(close->cl_seqid);
 462         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 463
 464         DECODE_TAIL;
 465 }
 466
 467
 468 static __be32
 469 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 470 {
 471         DECODE_HEAD;
 472
 473         READ_BUF(12);
 474         READ64(commit->co_offset);
 475         READ32(commit->co_count);
 476
 477         DECODE_TAIL;
 478 }
 479
 480 static __be32
 481 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 482 {
 483         DECODE_HEAD;
 484
 485         READ_BUF(4);
 486         READ32(create->cr_type);
 487         switch (create->cr_type) {
 488         case NF4LNK:
 489                 READ_BUF(4);
 490                 READ32(create->cr_linklen);
 491                 READ_BUF(create->cr_linklen);
 492                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 493                 break;
 494         case NF4BLK:
 495         case NF4CHR:
 496                 READ_BUF(8);
 497                 READ32(create->cr_specdata1);
 498                 READ32(create->cr_specdata2);
 499                 break;
 500         case NF4SOCK:
 501         case NF4FIFO:
 502         case NF4DIR:
 503         default:
 504                 break;
 505         }
 506
 507         READ_BUF(4);
 508         READ32(create->cr_namelen);
 509         READ_BUF(create->cr_namelen);
 510         SAVEMEM(create->cr_name, create->cr_namelen);
 511         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 512                 return status;
 513
 514         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 515                                     &create->cr_acl);
 516         if (status)
 517                 goto out;
 518
 519         DECODE_TAIL;
 520 }
 521
 522 static inline __be32
 523 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 524 {
 525         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 526 }
 527
 528 static inline __be32
 529 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 530 {
 531         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 532 }
 533
 534 static __be32
 535 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 536 {
 537         DECODE_HEAD;
 538
 539         READ_BUF(4);
 540         READ32(link->li_namelen);
 541         READ_BUF(link->li_namelen);
 542         SAVEMEM(link->li_name, link->li_namelen);
 543         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 544                 return status;
 545
 546         DECODE_TAIL;
 547 }
 548
 549 static __be32
 550 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 551 {
 552         DECODE_HEAD;
 553
 554         lock->lk_replay_owner = NULL;
 555         /*
 556         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 557         */
 558         READ_BUF(28);
 559         READ32(lock->lk_type);
 560         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 561                 goto xdr_error;
 562         READ32(lock->lk_reclaim);
 563         READ64(lock->lk_offset);
 564         READ64(lock->lk_length);
 565         READ32(lock->lk_is_new);
 566
 567         if (lock->lk_is_new) {
 568                 READ_BUF(4);
 569                 READ32(lock->lk_new_open_seqid);
 570                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 571                 if (status)
 572                         return status;
 573                 READ_BUF(8 + sizeof(clientid_t));
 574                 READ32(lock->lk_new_lock_seqid);
 575                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 576                 READ32(lock->lk_new_owner.len);
 577                 READ_BUF(lock->lk_new_owner.len);
 578                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 579         } else {
 580                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 581                 if (status)
 582                         return status;
 583                 READ_BUF(4);
 584                 READ32(lock->lk_old_lock_seqid);
 585         }
 586
 587         DECODE_TAIL;
 588 }
 589
 590 static __be32
 591 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 592 {
 593         DECODE_HEAD;
 594
 595         READ_BUF(32);
 596         READ32(lockt->lt_type);
 597         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 598                 goto xdr_error;
 599         READ64(lockt->lt_offset);
 600         READ64(lockt->lt_length);
 601         COPYMEM(&lockt->lt_clientid, 8);
 602         READ32(lockt->lt_owner.len);
 603         READ_BUF(lockt->lt_owner.len);
 604         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 605
 606         DECODE_TAIL;
 607 }
 608
 609 static __be32
 610 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 611 {
 612         DECODE_HEAD;
 613
 614         locku->lu_stateowner = NULL;
 615         READ_BUF(8);
 616         READ32(locku->lu_type);
 617         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 618                 goto xdr_error;
 619         READ32(locku->lu_seqid);
 620         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 621         if (status)
 622                 return status;
 623         READ_BUF(16);
 624         READ64(locku->lu_offset);
 625         READ64(locku->lu_length);
 626
 627         DECODE_TAIL;
 628 }
 629
 630 static __be32
 631 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 632 {
 633         DECODE_HEAD;
 634
 635         READ_BUF(4);
 636         READ32(lookup->lo_len);
 637         READ_BUF(lookup->lo_len);
 638         SAVEMEM(lookup->lo_name, lookup->lo_len);
 639         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 640                 return status;
 641
 642         DECODE_TAIL;
 643 }
 644
 645 static __be32
 646 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 647 {
 648         DECODE_HEAD;
 649
 650         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 651         open->op_iattr.ia_valid = 0;
 652         open->op_stateowner = NULL;
 653
 654         /* seqid, share_access, share_deny, clientid, ownerlen */
 655         READ_BUF(16 + sizeof(clientid_t));
 656         READ32(open->op_seqid);
 657         READ32(open->op_share_access);
 658         READ32(open->op_share_deny);
 659         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 660         READ32(open->op_owner.len);
 661
 662         /* owner, open_flag */
 663         READ_BUF(open->op_owner.len + 4);
 664         SAVEMEM(open->op_owner.data, open->op_owner.len);
 665         READ32(open->op_create);
 666         switch (open->op_create) {
 667         case NFS4_OPEN_NOCREATE:
 668                 break;
 669         case NFS4_OPEN_CREATE:
 670                 READ_BUF(4);
 671                 READ32(open->op_createmode);
 672                 switch (open->op_createmode) {
 673                 case NFS4_CREATE_UNCHECKED:
 674                 case NFS4_CREATE_GUARDED:
 675                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 676                                 &open->op_iattr, &open->op_acl);
 677                         if (status)
 678                                 goto out;
 679                         break;
 680                 case NFS4_CREATE_EXCLUSIVE:
 681                         READ_BUF(8);
 682                         COPYMEM(open->op_verf.data, 8);
 683                         break;
 684                 case NFS4_CREATE_EXCLUSIVE4_1:
 685                         if (argp->minorversion < 1)
 686                                 goto xdr_error;
 687                         READ_BUF(8);
 688                         COPYMEM(open->op_verf.data, 8);
 689                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 690                                 &open->op_iattr, &open->op_acl);
 691                         if (status)
 692                                 goto out;
 693                         break;
 694                 default:
 695                         goto xdr_error;
 696                 }
 697                 break;
 698         default:
 699                 goto xdr_error;
 700         }
 701
 702         /* open_claim */
 703         READ_BUF(4);
 704         READ32(open->op_claim_type);
 705         switch (open->op_claim_type) {
 706         case NFS4_OPEN_CLAIM_NULL:
 707         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 708                 READ_BUF(4);
 709                 READ32(open->op_fname.len);
 710                 READ_BUF(open->op_fname.len);
 711                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 712                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 713                         return status;
 714                 break;
 715         case NFS4_OPEN_CLAIM_PREVIOUS:
 716                 READ_BUF(4);
 717                 READ32(open->op_delegate_type);
 718                 break;
 719         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 720                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 721                 if (status)
 722                         return status;
 723                 READ_BUF(4);
 724                 READ32(open->op_fname.len);
 725                 READ_BUF(open->op_fname.len);
 726                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 727                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 728                         return status;
 729                 break;
 730         default:
 731                 goto xdr_error;
 732         }
 733
 734         DECODE_TAIL;
 735 }
 736
 737 static __be32
 738 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 739 {
 740         DECODE_HEAD;
 741
 742         open_conf->oc_stateowner = NULL;
 743         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 744         if (status)
 745                 return status;
 746         READ_BUF(4);
 747         READ32(open_conf->oc_seqid);
 748
 749         DECODE_TAIL;
 750 }
 751
 752 static __be32
 753 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 754 {
 755         DECODE_HEAD;
 756
 757         open_down->od_stateowner = NULL;
 758         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 759         if (status)
 760                 return status;
 761         READ_BUF(12);
 762         READ32(open_down->od_seqid);
 763         READ32(open_down->od_share_access);
 764         READ32(open_down->od_share_deny);
 765
 766         DECODE_TAIL;
 767 }
 768
 769 static __be32
 770 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 771 {
 772         DECODE_HEAD;
 773
 774         READ_BUF(4);
 775         READ32(putfh->pf_fhlen);
 776         if (putfh->pf_fhlen > NFS4_FHSIZE)
 777                 goto xdr_error;
 778         READ_BUF(putfh->pf_fhlen);
 779         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 780
 781         DECODE_TAIL;
 782 }
 783
 784 static __be32
 785 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 786 {
 787         DECODE_HEAD;
 788
 789         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 790         if (status)
 791                 return status;
 792         READ_BUF(12);
 793         READ64(read->rd_offset);
 794         READ32(read->rd_length);
 795
 796         DECODE_TAIL;
 797 }
 798
 799 static __be32
 800 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 801 {
 802         DECODE_HEAD;
 803
 804         READ_BUF(24);
 805         READ64(readdir->rd_cookie);
 806         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 807         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 808         READ32(readdir->rd_maxcount);
 809         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 810                 goto out;
 811
 812         DECODE_TAIL;
 813 }
 814
 815 static __be32
 816 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 817 {
 818         DECODE_HEAD;
 819
 820         READ_BUF(4);
 821         READ32(remove->rm_namelen);
 822         READ_BUF(remove->rm_namelen);
 823         SAVEMEM(remove->rm_name, remove->rm_namelen);
 824         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 825                 return status;
 826
 827         DECODE_TAIL;
 828 }
 829
 830 static __be32
 831 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 832 {
 833         DECODE_HEAD;
 834
 835         READ_BUF(4);
 836         READ32(rename->rn_snamelen);
 837         READ_BUF(rename->rn_snamelen + 4);
 838         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 839         READ32(rename->rn_tnamelen);
 840         READ_BUF(rename->rn_tnamelen);
 841         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 842         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 843                 return status;
 844         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 845                 return status;
 846
 847         DECODE_TAIL;
 848 }
 849
 850 static __be32
 851 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 852 {
 853         DECODE_HEAD;
 854
 855         READ_BUF(sizeof(clientid_t));
 856         COPYMEM(clientid, sizeof(clientid_t));
 857
 858         DECODE_TAIL;
 859 }
 860
 861 static __be32
 862 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 863                      struct nfsd4_secinfo *secinfo)
 864 {
 865         DECODE_HEAD;
 866
 867         READ_BUF(4);
 868         READ32(secinfo->si_namelen);
 869         READ_BUF(secinfo->si_namelen);
 870         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 871         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 872                                                                 nfserr_noent);
 873         if (status)
 874                 return status;
 875         DECODE_TAIL;
 876 }
 877
 878 static __be32
 879 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
 880                      struct nfsd4_secinfo_no_name *sin)
 881 {
 882         DECODE_HEAD;
 883
 884         READ_BUF(4);
 885         READ32(sin->sin_style);
 886         DECODE_TAIL;
 887 }
 888
 889 static __be32
 890 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 891 {
 892         __be32 status;
 893
 894         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 895         if (status)
 896                 return status;
 897         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 898                                   &setattr->sa_acl);
 899 }
 900
 901 static __be32
 902 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 903 {
 904         DECODE_HEAD;
 905
 906         READ_BUF(12);
 907         COPYMEM(setclientid->se_verf.data, 8);
 908         READ32(setclientid->se_namelen);
 909
 910         READ_BUF(setclientid->se_namelen + 8);
 911         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 912         READ32(setclientid->se_callback_prog);
 913         READ32(setclientid->se_callback_netid_len);
 914
 915         READ_BUF(setclientid->se_callback_netid_len + 4);
 916         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 917         READ32(setclientid->se_callback_addr_len);
 918
 919         READ_BUF(setclientid->se_callback_addr_len + 4);
 920         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 921         READ32(setclientid->se_callback_ident);
 922
 923         DECODE_TAIL;
 924 }
 925
 926 static __be32
 927 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 928 {
 929         DECODE_HEAD;
 930
 931         READ_BUF(8 + sizeof(nfs4_verifier));
 932         COPYMEM(&scd_c->sc_clientid, 8);
 933         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 934
 935         DECODE_TAIL;
 936 }
 937
 938 /* Also used for NVERIFY */
 939 static __be32
 940 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 941 {
 942 #if 0
 943         struct nfsd4_compoundargs save = {
 944                 .p = argp->p,
 945                 .end = argp->end,
 946                 .rqstp = argp->rqstp,
 947         };
 948         u32             ve_bmval[2];
 949         struct iattr    ve_iattr;           /* request */
 950         struct nfs4_acl *ve_acl;            /* request */
 951 #endif
 952         DECODE_HEAD;
 953
 954         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 955                 goto out;
 956
 957         /* For convenience's sake, we compare raw xdr'd attributes in
 958          * nfsd4_proc_verify; however we still decode here just to return
 959          * correct error in case of bad xdr. */
 960 #if 0
 961         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 962         if (status == nfserr_inval) {
 963                 status = nfserrno(status);
 964                 goto out;
 965         }
 966 #endif
 967         READ_BUF(4);
 968         READ32(verify->ve_attrlen);
 969         READ_BUF(verify->ve_attrlen);
 970         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 971
 972         DECODE_TAIL;
 973 }
 974
 975 static __be32
 976 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 977 {
 978         int avail;
 979         int v;
 980         int len;
 981         DECODE_HEAD;
 982
 983         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 984         if (status)
 985                 return status;
 986         READ_BUF(16);
 987         READ64(write->wr_offset);
 988         READ32(write->wr_stable_how);
 989         if (write->wr_stable_how > 2)
 990                 goto xdr_error;
 991         READ32(write->wr_buflen);
 992
 993         /* Sorry .. no magic macros for this.. *
 994          * READ_BUF(write->wr_buflen);
 995          * SAVEMEM(write->wr_buf, write->wr_buflen);
 996          */
 997         avail = (char*)argp->end - (char*)argp->p;
 998         if (avail + argp->pagelen < write->wr_buflen) {
 999                 dprintk("NFSD: xdr error (%s:%d)\n",
1000                                 __FILE__, __LINE__);
1001                 goto xdr_error;
1002         }
1003         argp->rqstp->rq_vec[0].iov_base = p;
1004         argp->rqstp->rq_vec[0].iov_len = avail;
1005         v = 0;
1006         len = write->wr_buflen;
1007         while (len > argp->rqstp->rq_vec[v].iov_len) {
1008                 len -= argp->rqstp->rq_vec[v].iov_len;
1009                 v++;
1010                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
1011                 argp->pagelist++;
1012                 if (argp->pagelen >= PAGE_SIZE) {
1013                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1014                         argp->pagelen -= PAGE_SIZE;
1015                 } else {
1016                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1017                         argp->pagelen -= len;
1018                 }
1019         }
1020         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1021         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1022         argp->rqstp->rq_vec[v].iov_len = len;
1023         write->wr_vlen = v+1;
1024
1025         DECODE_TAIL;
1026 }
1027
1028 static __be32
1029 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1030 {
1031         DECODE_HEAD;
1032
1033         READ_BUF(12);
1034         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1035         READ32(rlockowner->rl_owner.len);
1036         READ_BUF(rlockowner->rl_owner.len);
1037         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1038
1039         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1040                 return nfserr_inval;
1041         DECODE_TAIL;
1042 }
1043
1044 static __be32
1045 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1046                          struct nfsd4_exchange_id *exid)
1047 {
1048         int dummy, tmp;
1049         DECODE_HEAD;
1050
1051         READ_BUF(NFS4_VERIFIER_SIZE);
1052         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1053
1054         READ_BUF(4);
1055         READ32(exid->clname.len);
1056
1057         READ_BUF(exid->clname.len);
1058         SAVEMEM(exid->clname.data, exid->clname.len);
1059
1060         READ_BUF(4);
1061         READ32(exid->flags);
1062
1063         /* Ignore state_protect4_a */
1064         READ_BUF(4);
1065         READ32(exid->spa_how);
1066         switch (exid->spa_how) {
1067         case SP4_NONE:
1068                 break;
1069         case SP4_MACH_CRED:
1070                 /* spo_must_enforce */
1071                 READ_BUF(4);
1072                 READ32(dummy);
1073                 READ_BUF(dummy * 4);
1074                 p += dummy;
1075
1076                 /* spo_must_allow */
1077                 READ_BUF(4);
1078                 READ32(dummy);
1079                 READ_BUF(dummy * 4);
1080                 p += dummy;
1081                 break;
1082         case SP4_SSV:
1083                 /* ssp_ops */
1084                 READ_BUF(4);
1085                 READ32(dummy);
1086                 READ_BUF(dummy * 4);
1087                 p += dummy;
1088
1089                 READ_BUF(4);
1090                 READ32(dummy);
1091                 READ_BUF(dummy * 4);
1092                 p += dummy;
1093
1094                 /* ssp_hash_algs<> */
1095                 READ_BUF(4);
1096                 READ32(tmp);
1097                 while (tmp--) {
1098                         READ_BUF(4);
1099                         READ32(dummy);
1100                         READ_BUF(dummy);
1101                         p += XDR_QUADLEN(dummy);
1102                 }
1103
1104                 /* ssp_encr_algs<> */
1105                 READ_BUF(4);
1106                 READ32(tmp);
1107                 while (tmp--) {
1108                         READ_BUF(4);
1109                         READ32(dummy);
1110                         READ_BUF(dummy);
1111                         p += XDR_QUADLEN(dummy);
1112                 }
1113
1114                 /* ssp_window and ssp_num_gss_handles */
1115                 READ_BUF(8);
1116                 READ32(dummy);
1117                 READ32(dummy);
1118                 break;
1119         default:
1120                 goto xdr_error;
1121         }
1122
1123         /* Ignore Implementation ID */
1124         READ_BUF(4);    /* nfs_impl_id4 array length */
1125         READ32(dummy);
1126
1127         if (dummy > 1)
1128                 goto xdr_error;
1129
1130         if (dummy == 1) {
1131                 /* nii_domain */
1132                 READ_BUF(4);
1133                 READ32(dummy);
1134                 READ_BUF(dummy);
1135                 p += XDR_QUADLEN(dummy);
1136
1137                 /* nii_name */
1138                 READ_BUF(4);
1139                 READ32(dummy);
1140                 READ_BUF(dummy);
1141                 p += XDR_QUADLEN(dummy);
1142
1143                 /* nii_date */
1144                 READ_BUF(12);
1145                 p += 3;
1146         }
1147         DECODE_TAIL;
1148 }
1149
1150 static __be32
1151 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1152                             struct nfsd4_create_session *sess)
1153 {
1154         DECODE_HEAD;
1155
1156         u32 dummy;
1157         char *machine_name;
1158         int i;
1159         int nr_secflavs;
1160
1161         READ_BUF(16);
1162         COPYMEM(&sess->clientid, 8);
1163         READ32(sess->seqid);
1164         READ32(sess->flags);
1165
1166         /* Fore channel attrs */
1167         READ_BUF(28);
1168         READ32(dummy); /* headerpadsz is always 0 */
1169         READ32(sess->fore_channel.maxreq_sz);
1170         READ32(sess->fore_channel.maxresp_sz);
1171         READ32(sess->fore_channel.maxresp_cached);
1172         READ32(sess->fore_channel.maxops);
1173         READ32(sess->fore_channel.maxreqs);
1174         READ32(sess->fore_channel.nr_rdma_attrs);
1175         if (sess->fore_channel.nr_rdma_attrs == 1) {
1176                 READ_BUF(4);
1177                 READ32(sess->fore_channel.rdma_attrs);
1178         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1179                 dprintk("Too many fore channel attr bitmaps!\n");
1180                 goto xdr_error;
1181         }
1182
1183         /* Back channel attrs */
1184         READ_BUF(28);
1185         READ32(dummy); /* headerpadsz is always 0 */
1186         READ32(sess->back_channel.maxreq_sz);
1187         READ32(sess->back_channel.maxresp_sz);
1188         READ32(sess->back_channel.maxresp_cached);
1189         READ32(sess->back_channel.maxops);
1190         READ32(sess->back_channel.maxreqs);
1191         READ32(sess->back_channel.nr_rdma_attrs);
1192         if (sess->back_channel.nr_rdma_attrs == 1) {
1193                 READ_BUF(4);
1194                 READ32(sess->back_channel.rdma_attrs);
1195         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1196                 dprintk("Too many back channel attr bitmaps!\n");
1197                 goto xdr_error;
1198         }
1199
1200         READ_BUF(8);
1201         READ32(sess->callback_prog);
1202
1203         /* callback_sec_params4 */
1204         READ32(nr_secflavs);
1205         for (i = 0; i < nr_secflavs; ++i) {
1206                 READ_BUF(4);
1207                 READ32(dummy);
1208                 switch (dummy) {
1209                 case RPC_AUTH_NULL:
1210                         /* Nothing to read */
1211                         break;
1212                 case RPC_AUTH_UNIX:
1213                         READ_BUF(8);
1214                         /* stamp */
1215                         READ32(dummy);
1216
1217                         /* machine name */
1218                         READ32(dummy);
1219                         READ_BUF(dummy);
1220                         SAVEMEM(machine_name, dummy);
1221
1222                         /* uid, gid */
1223                         READ_BUF(8);
1224                         READ32(sess->uid);
1225                         READ32(sess->gid);
1226
1227                         /* more gids */
1228                         READ_BUF(4);
1229                         READ32(dummy);
1230                         READ_BUF(dummy * 4);
1231                         break;
1232                 case RPC_AUTH_GSS:
1233                         dprintk("RPC_AUTH_GSS callback secflavor "
1234                                 "not supported!\n");
1235                         READ_BUF(8);
1236                         /* gcbp_service */
1237                         READ32(dummy);
1238                         /* gcbp_handle_from_server */
1239                         READ32(dummy);
1240                         READ_BUF(dummy);
1241                         p += XDR_QUADLEN(dummy);
1242                         /* gcbp_handle_from_client */
1243                         READ_BUF(4);
1244                         READ32(dummy);
1245                         READ_BUF(dummy);
1246                         break;
1247                 default:
1248                         dprintk("Illegal callback secflavor\n");
1249                         return nfserr_inval;
1250                 }
1251         }
1252         DECODE_TAIL;
1253 }
1254
1255 static __be32
1256 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1257                              struct nfsd4_destroy_session *destroy_session)
1258 {
1259         DECODE_HEAD;
1260         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1261         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1262
1263         DECODE_TAIL;
1264 }
1265
1266 static __be32
1267 nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1268                           struct nfsd4_free_stateid *free_stateid)
1269 {
1270         DECODE_HEAD;
1271
1272         READ_BUF(sizeof(stateid_t));
1273         READ32(free_stateid->fr_stateid.si_generation);
1274         COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1275
1276         DECODE_TAIL;
1277 }
1278
1279 static __be32
1280 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1281                       struct nfsd4_sequence *seq)
1282 {
1283         DECODE_HEAD;
1284
1285         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1286         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1287         READ32(seq->seqid);
1288         READ32(seq->slotid);
1289         READ32(seq->maxslots);
1290         READ32(seq->cachethis);
1291
1292         DECODE_TAIL;
1293 }
1294
1295 static __be32
1296 nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1297 {
1298         unsigned int nbytes;
1299         stateid_t si;
1300         int i;
1301         __be32 *p;
1302         __be32 status;
1303
1304         READ_BUF(4);
1305         test_stateid->ts_num_ids = ntohl(*p++);
1306
1307         nbytes = test_stateid->ts_num_ids * sizeof(stateid_t);
1308         if (nbytes > (u32)((char *)argp->end - (char *)argp->p))
1309                 goto xdr_error;
1310
1311         test_stateid->ts_saved_args = argp;
1312         save_buf(argp, &test_stateid->ts_savedp);
1313
1314         for (i = 0; i < test_stateid->ts_num_ids; i++) {
1315                 status = nfsd4_decode_stateid(argp, &si);
1316                 if (status)
1317                         return status;
1318         }
1319
1320         status = 0;
1321 out:
1322         return status;
1323 xdr_error:
1324         dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1325         status = nfserr_bad_xdr;
1326         goto out;
1327 }
1328
1329 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1330 {
1331         DECODE_HEAD;
1332
1333         READ_BUF(4);
1334         READ32(rc->rca_one_fs);
1335
1336         DECODE_TAIL;
1337 }
1338
1339 static __be32
1340 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1341 {
1342         return nfs_ok;
1343 }
1344
1345 static __be32
1346 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1347 {
1348         return nfserr_notsupp;
1349 }
1350
1351 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1352
1353 static nfsd4_dec nfsd4_dec_ops[] = {
1354         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1355         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1356         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1357         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1358         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1359         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1360         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1361         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1362         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1363         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1364         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1365         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1366         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1367         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1368         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1369         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1370         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1371         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1372         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1373         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1374         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1375         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1376         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1377         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1378         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1379         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1380         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1381         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1382         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1383         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1384         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1385         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1386         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1387         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1388         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1389         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1390         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1391 };
1392
1393 static nfsd4_dec nfsd41_dec_ops[] = {
1394         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1395         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1396         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1397         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1398         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1399         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1400         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1401         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1402         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1403         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1404         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1405         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1406         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1407         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1408         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1409         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1410         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1411         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1412         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1413         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1414         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1415         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1416         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1417         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1418         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1419         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1420         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1421         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1422         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1423         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1424         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1425         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1426         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1427         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1428         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1429         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1430         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1431
1432         /* new operations for NFSv4.1 */
1433         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1434         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1435         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1436         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1437         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1438         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1439         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1440         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1441         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1442         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1443         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1444         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1445         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1446         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1447         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1448         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1449         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1450         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_notsupp,
1451         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1452 };
1453
1454 struct nfsd4_minorversion_ops {
1455         nfsd4_dec *decoders;
1456         int nops;
1457 };
1458
1459 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1460         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1461         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1462 };
1463
1464 static __be32
1465 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1466 {
1467         DECODE_HEAD;
1468         struct nfsd4_op *op;
1469         struct nfsd4_minorversion_ops *ops;
1470         bool cachethis = false;
1471         int i;
1472
1473         /*
1474          * XXX: According to spec, we should check the tag
1475          * for UTF-8 compliance.  I'm postponing this for
1476          * now because it seems that some clients do use
1477          * binary tags.
1478          */
1479         READ_BUF(4);
1480         READ32(argp->taglen);
1481         READ_BUF(argp->taglen + 8);
1482         SAVEMEM(argp->tag, argp->taglen);
1483         READ32(argp->minorversion);
1484         READ32(argp->opcnt);
1485
1486         if (argp->taglen > NFSD4_MAX_TAGLEN)
1487                 goto xdr_error;
1488         if (argp->opcnt > 100)
1489                 goto xdr_error;
1490
1491         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1492                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1493                 if (!argp->ops) {
1494                         argp->ops = argp->iops;
1495                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1496                         goto xdr_error;
1497                 }
1498         }
1499
1500         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1501                 argp->opcnt = 0;
1502
1503         ops = &nfsd4_minorversion[argp->minorversion];
1504         for (i = 0; i < argp->opcnt; i++) {
1505                 op = &argp->ops[i];
1506                 op->replay = NULL;
1507
1508                 /*
1509                  * We can't use READ_BUF() here because we need to handle
1510                  * a missing opcode as an OP_WRITE + 1. So we need to check
1511                  * to see if we're truly at the end of our buffer or if there
1512                  * is another page we need to flip to.
1513                  */
1514
1515                 if (argp->p == argp->end) {
1516                         if (argp->pagelen < 4) {
1517                                 /* There isn't an opcode still on the wire */
1518                                 op->opnum = OP_WRITE + 1;
1519                                 op->status = nfserr_bad_xdr;
1520                                 argp->opcnt = i+1;
1521                                 break;
1522                         }
1523
1524                         /*
1525                          * False alarm. We just hit a page boundary, but there
1526                          * is still data available.  Move pointer across page
1527                          * boundary.  *snip from READ_BUF*
1528                          */
1529                         argp->p = page_address(argp->pagelist[0]);
1530                         argp->pagelist++;
1531                         if (argp->pagelen < PAGE_SIZE) {
1532                                 argp->end = argp->p + (argp->pagelen>>2);
1533                                 argp->pagelen = 0;
1534                         } else {
1535                                 argp->end = argp->p + (PAGE_SIZE>>2);
1536                                 argp->pagelen -= PAGE_SIZE;
1537                         }
1538                 }
1539                 op->opnum = ntohl(*argp->p++);
1540
1541                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1542                         op->status = ops->decoders[op->opnum](argp, &op->u);
1543                 else {
1544                         op->opnum = OP_ILLEGAL;
1545                         op->status = nfserr_op_illegal;
1546                 }
1547
1548                 if (op->status) {
1549                         argp->opcnt = i+1;
1550                         break;
1551                 }
1552                 /*
1553                  * We'll try to cache the result in the DRC if any one
1554                  * op in the compound wants to be cached:
1555                  */
1556                 cachethis |= nfsd4_cache_this_op(op);
1557         }
1558         /* Sessions make the DRC unnecessary: */
1559         if (argp->minorversion)
1560                 cachethis = false;
1561         argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1562
1563         DECODE_TAIL;
1564 }
1565
1566 #define WRITE32(n)               *p++ = htonl(n)
1567 #define WRITE64(n)               do {                           \
1568         *p++ = htonl((u32)((n) >> 32));                         \
1569         *p++ = htonl((u32)(n));                                 \
1570 } while (0)
1571 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1572         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1573         memcpy(p, ptr, nbytes);                                 \
1574         p += XDR_QUADLEN(nbytes);                               \
1575 }} while (0)
1576
1577 static void write32(__be32 **p, u32 n)
1578 {
1579         *(*p)++ = n;
1580 }
1581
1582 static void write64(__be32 **p, u64 n)
1583 {
1584         write32(p, (u32)(n >> 32));
1585         write32(p, (u32)n);
1586 }
1587
1588 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1589 {
1590         if (IS_I_VERSION(inode)) {
1591                 write64(p, inode->i_version);
1592         } else {
1593                 write32(p, stat->ctime.tv_sec);
1594                 write32(p, stat->ctime.tv_nsec);
1595         }
1596 }
1597
1598 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1599 {
1600         write32(p, c->atomic);
1601         if (c->change_supported) {
1602                 write64(p, c->before_change);
1603                 write64(p, c->after_change);
1604         } else {
1605                 write32(p, c->before_ctime_sec);
1606                 write32(p, c->before_ctime_nsec);
1607                 write32(p, c->after_ctime_sec);
1608                 write32(p, c->after_ctime_nsec);
1609         }
1610 }
1611
1612 #define RESERVE_SPACE(nbytes)   do {                            \
1613         p = resp->p;                                            \
1614         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1615 } while (0)
1616 #define ADJUST_ARGS()           resp->p = p
1617
1618 /*
1619  * Header routine to setup seqid operation replay cache
1620  */
1621 #define ENCODE_SEQID_OP_HEAD                                    \
1622         __be32 *save;                                           \
1623                                                                 \
1624         save = resp->p;
1625
1626 /*
1627  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1628  * is where sequence id's are incremented, and the replay cache is filled.
1629  * Note that we increment sequence id's here, at the last moment, so we're sure
1630  * we know whether the error to be returned is a sequence id mutating error.
1631  */
1632
1633 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1634         if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {  \
1635                 stateowner->so_seqid++;                         \
1636                 stateowner->so_replay.rp_status = nfserr;       \
1637                 stateowner->so_replay.rp_buflen =               \
1638                           (((char *)(resp)->p - (char *)save)); \
1639                 memcpy(stateowner->so_replay.rp_buf, save,      \
1640                         stateowner->so_replay.rp_buflen);       \
1641         } } while (0);
1642
1643 /* Encode as an array of strings the string given with components
1644  * separated @sep.
1645  */
1646 static __be32 nfsd4_encode_components(char sep, char *components,
1647                                    __be32 **pp, int *buflen)
1648 {
1649         __be32 *p = *pp;
1650         __be32 *countp = p;
1651         int strlen, count=0;
1652         char *str, *end;
1653
1654         dprintk("nfsd4_encode_components(%s)\n", components);
1655         if ((*buflen -= 4) < 0)
1656                 return nfserr_resource;
1657         WRITE32(0); /* We will fill this in with @count later */
1658         end = str = components;
1659         while (*end) {
1660                 for (; *end && (*end != sep); end++)
1661                         ; /* Point to end of component */
1662                 strlen = end - str;
1663                 if (strlen) {
1664                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1665                                 return nfserr_resource;
1666                         WRITE32(strlen);
1667                         WRITEMEM(str, strlen);
1668                         count++;
1669                 }
1670                 else
1671                         end++;
1672                 str = end;
1673         }
1674         *pp = p;
1675         p = countp;
1676         WRITE32(count);
1677         return 0;
1678 }
1679
1680 /*
1681  * encode a location element of a fs_locations structure
1682  */
1683 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1684                                     __be32 **pp, int *buflen)
1685 {
1686         __be32 status;
1687         __be32 *p = *pp;
1688
1689         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1690         if (status)
1691                 return status;
1692         status = nfsd4_encode_components('/', location->path, &p, buflen);
1693         if (status)
1694                 return status;
1695         *pp = p;
1696         return 0;
1697 }
1698
1699 /*
1700  * Return the path to an export point in the pseudo filesystem namespace
1701  * Returned string is safe to use as long as the caller holds a reference
1702  * to @exp.
1703  */
1704 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1705 {
1706         struct svc_fh tmp_fh;
1707         char *path = NULL, *rootpath;
1708         size_t rootlen;
1709
1710         fh_init(&tmp_fh, NFS4_FHSIZE);
1711         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1712         if (*stat)
1713                 return NULL;
1714         rootpath = tmp_fh.fh_export->ex_pathname;
1715
1716         path = exp->ex_pathname;
1717
1718         rootlen = strlen(rootpath);
1719         if (strncmp(path, rootpath, rootlen)) {
1720                 dprintk("nfsd: fs_locations failed;"
1721                         "%s is not contained in %s\n", path, rootpath);
1722                 *stat = nfserr_notsupp;
1723                 path = NULL;
1724                 goto out;
1725         }
1726         path += rootlen;
1727 out:
1728         fh_put(&tmp_fh);
1729         return path;
1730 }
1731
1732 /*
1733  *  encode a fs_locations structure
1734  */
1735 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1736                                      struct svc_export *exp,
1737                                      __be32 **pp, int *buflen)
1738 {
1739         __be32 status;
1740         int i;
1741         __be32 *p = *pp;
1742         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1743         char *root = nfsd4_path(rqstp, exp, &status);
1744
1745         if (status)
1746                 return status;
1747         status = nfsd4_encode_components('/', root, &p, buflen);
1748         if (status)
1749                 return status;
1750         if ((*buflen -= 4) < 0)
1751                 return nfserr_resource;
1752         WRITE32(fslocs->locations_count);
1753         for (i=0; i<fslocs->locations_count; i++) {
1754                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1755                                                    &p, buflen);
1756                 if (status)
1757                         return status;
1758         }
1759         *pp = p;
1760         return 0;
1761 }
1762
1763 static u32 nfs4_file_type(umode_t mode)
1764 {
1765         switch (mode & S_IFMT) {
1766         case S_IFIFO:   return NF4FIFO;
1767         case S_IFCHR:   return NF4CHR;
1768         case S_IFDIR:   return NF4DIR;
1769         case S_IFBLK:   return NF4BLK;
1770         case S_IFLNK:   return NF4LNK;
1771         case S_IFREG:   return NF4REG;
1772         case S_IFSOCK:  return NF4SOCK;
1773         default:        return NF4BAD;
1774         };
1775 }
1776
1777 static __be32
1778 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1779                         __be32 **p, int *buflen)
1780 {
1781         int status;
1782
1783         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1784                 return nfserr_resource;
1785         if (whotype != NFS4_ACL_WHO_NAMED)
1786                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1787         else if (group)
1788                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1789         else
1790                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1791         if (status < 0)
1792                 return nfserrno(status);
1793         *p = xdr_encode_opaque(*p, NULL, status);
1794         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1795         BUG_ON(*buflen < 0);
1796         return 0;
1797 }
1798
1799 static inline __be32
1800 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1801 {
1802         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1803 }
1804
1805 static inline __be32
1806 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1807 {
1808         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1809 }
1810
1811 static inline __be32
1812 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1813                 __be32 **p, int *buflen)
1814 {
1815         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1816 }
1817
1818 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1819                               FATTR4_WORD0_RDATTR_ERROR)
1820 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1821
1822 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1823 {
1824         /* As per referral draft:  */
1825         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1826             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1827                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1828                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1829                         *rdattr_err = NFSERR_MOVED;
1830                 else
1831                         return nfserr_moved;
1832         }
1833         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1834         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1835         return 0;
1836 }
1837
1838 /*
1839  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1840  * ourselves.
1841  *
1842  * @countp is the buffer size in _words_; upon successful return this becomes
1843  * replaced with the number of words written.
1844  */
1845 __be32
1846 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1847                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1848                 struct svc_rqst *rqstp, int ignore_crossmnt)
1849 {
1850         u32 bmval0 = bmval[0];
1851         u32 bmval1 = bmval[1];
1852         u32 bmval2 = bmval[2];
1853         struct kstat stat;
1854         struct svc_fh tempfh;
1855         struct kstatfs statfs;
1856         int buflen = *countp << 2;
1857         __be32 *attrlenp;
1858         u32 dummy;
1859         u64 dummy64;
1860         u32 rdattr_err = 0;
1861         __be32 *p = buffer;
1862         __be32 status;
1863         int err;
1864         int aclsupport = 0;
1865         struct nfs4_acl *acl = NULL;
1866         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1867         u32 minorversion = resp->cstate.minorversion;
1868         struct path path = {
1869                 .mnt    = exp->ex_path.mnt,
1870                 .dentry = dentry,
1871         };
1872
1873         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1874         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1875         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1876         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1877
1878         if (exp->ex_fslocs.migrated) {
1879                 BUG_ON(bmval[2]);
1880                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1881                 if (status)
1882                         goto out;
1883         }
1884
1885         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1886         if (err)
1887                 goto out_nfserr;
1888         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1889                         FATTR4_WORD0_MAXNAME)) ||
1890             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1891                        FATTR4_WORD1_SPACE_TOTAL))) {
1892                 err = vfs_statfs(&path, &statfs);
1893                 if (err)
1894                         goto out_nfserr;
1895         }
1896         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1897                 fh_init(&tempfh, NFS4_FHSIZE);
1898                 status = fh_compose(&tempfh, exp, dentry, NULL);
1899                 if (status)
1900                         goto out;
1901                 fhp = &tempfh;
1902         }
1903         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1904                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1905                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1906                 aclsupport = (err == 0);
1907                 if (bmval0 & FATTR4_WORD0_ACL) {
1908                         if (err == -EOPNOTSUPP)
1909                                 bmval0 &= ~FATTR4_WORD0_ACL;
1910                         else if (err == -EINVAL) {
1911                                 status = nfserr_attrnotsupp;
1912                                 goto out;
1913                         } else if (err != 0)
1914                                 goto out_nfserr;
1915                 }
1916         }
1917
1918         if (bmval2) {
1919                 if ((buflen -= 16) < 0)
1920                         goto out_resource;
1921                 WRITE32(3);
1922                 WRITE32(bmval0);
1923                 WRITE32(bmval1);
1924                 WRITE32(bmval2);
1925         } else if (bmval1) {
1926                 if ((buflen -= 12) < 0)
1927                         goto out_resource;
1928                 WRITE32(2);
1929                 WRITE32(bmval0);
1930                 WRITE32(bmval1);
1931         } else {
1932                 if ((buflen -= 8) < 0)
1933                         goto out_resource;
1934                 WRITE32(1);
1935                 WRITE32(bmval0);
1936         }
1937         attrlenp = p++;                /* to be backfilled later */
1938
1939         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1940                 u32 word0 = nfsd_suppattrs0(minorversion);
1941                 u32 word1 = nfsd_suppattrs1(minorversion);
1942                 u32 word2 = nfsd_suppattrs2(minorversion);
1943
1944                 if (!aclsupport)
1945                         word0 &= ~FATTR4_WORD0_ACL;
1946                 if (!word2) {
1947                         if ((buflen -= 12) < 0)
1948                                 goto out_resource;
1949                         WRITE32(2);
1950                         WRITE32(word0);
1951                         WRITE32(word1);
1952                 } else {
1953                         if ((buflen -= 16) < 0)
1954                                 goto out_resource;
1955                         WRITE32(3);
1956                         WRITE32(word0);
1957                         WRITE32(word1);
1958                         WRITE32(word2);
1959                 }
1960         }
1961         if (bmval0 & FATTR4_WORD0_TYPE) {
1962                 if ((buflen -= 4) < 0)
1963                         goto out_resource;
1964                 dummy = nfs4_file_type(stat.mode);
1965                 if (dummy == NF4BAD)
1966                         goto out_serverfault;
1967                 WRITE32(dummy);
1968         }
1969         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1970                 if ((buflen -= 4) < 0)
1971                         goto out_resource;
1972                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1973                         WRITE32(NFS4_FH_PERSISTENT);
1974                 else
1975                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1976         }
1977         if (bmval0 & FATTR4_WORD0_CHANGE) {
1978                 if ((buflen -= 8) < 0)
1979                         goto out_resource;
1980                 write_change(&p, &stat, dentry->d_inode);
1981         }
1982         if (bmval0 & FATTR4_WORD0_SIZE) {
1983                 if ((buflen -= 8) < 0)
1984                         goto out_resource;
1985                 WRITE64(stat.size);
1986         }
1987         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1988                 if ((buflen -= 4) < 0)
1989                         goto out_resource;
1990                 WRITE32(1);
1991         }
1992         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1993                 if ((buflen -= 4) < 0)
1994                         goto out_resource;
1995                 WRITE32(1);
1996         }
1997         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1998                 if ((buflen -= 4) < 0)
1999                         goto out_resource;
2000                 WRITE32(0);
2001         }
2002         if (bmval0 & FATTR4_WORD0_FSID) {
2003                 if ((buflen -= 16) < 0)
2004                         goto out_resource;
2005                 if (exp->ex_fslocs.migrated) {
2006                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2007                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2008                 } else switch(fsid_source(fhp)) {
2009                 case FSIDSOURCE_FSID:
2010                         WRITE64((u64)exp->ex_fsid);
2011                         WRITE64((u64)0);
2012                         break;
2013                 case FSIDSOURCE_DEV:
2014                         WRITE32(0);
2015                         WRITE32(MAJOR(stat.dev));
2016                         WRITE32(0);
2017                         WRITE32(MINOR(stat.dev));
2018                         break;
2019                 case FSIDSOURCE_UUID:
2020                         WRITEMEM(exp->ex_uuid, 16);
2021                         break;
2022                 }
2023         }
2024         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2025                 if ((buflen -= 4) < 0)
2026                         goto out_resource;
2027                 WRITE32(0);
2028         }
2029         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2030                 if ((buflen -= 4) < 0)
2031                         goto out_resource;
2032                 WRITE32(nfsd4_lease);
2033         }
2034         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2035                 if ((buflen -= 4) < 0)
2036                         goto out_resource;
2037                 WRITE32(rdattr_err);
2038         }
2039         if (bmval0 & FATTR4_WORD0_ACL) {
2040                 struct nfs4_ace *ace;
2041
2042                 if (acl == NULL) {
2043                         if ((buflen -= 4) < 0)
2044                                 goto out_resource;
2045
2046                         WRITE32(0);
2047                         goto out_acl;
2048                 }
2049                 if ((buflen -= 4) < 0)
2050                         goto out_resource;
2051                 WRITE32(acl->naces);
2052
2053                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2054                         if ((buflen -= 4*3) < 0)
2055                                 goto out_resource;
2056                         WRITE32(ace->type);
2057                         WRITE32(ace->flag);
2058                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2059                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
2060                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2061                                 &p, &buflen);
2062                         if (status == nfserr_resource)
2063                                 goto out_resource;
2064                         if (status)
2065                                 goto out;
2066                 }
2067         }
2068 out_acl:
2069         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2070                 if ((buflen -= 4) < 0)
2071                         goto out_resource;
2072                 WRITE32(aclsupport ?
2073                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2074         }
2075         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2076                 if ((buflen -= 4) < 0)
2077                         goto out_resource;
2078                 WRITE32(1);
2079         }
2080         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2081                 if ((buflen -= 4) < 0)
2082                         goto out_resource;
2083                 WRITE32(1);
2084         }
2085         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2086                 if ((buflen -= 4) < 0)
2087                         goto out_resource;
2088                 WRITE32(1);
2089         }
2090         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2091                 if ((buflen -= 4) < 0)
2092                         goto out_resource;
2093                 WRITE32(1);
2094         }
2095         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2096                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2097                 if (buflen < 0)
2098                         goto out_resource;
2099                 WRITE32(fhp->fh_handle.fh_size);
2100                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2101         }
2102         if (bmval0 & FATTR4_WORD0_FILEID) {
2103                 if ((buflen -= 8) < 0)
2104                         goto out_resource;
2105                 WRITE64(stat.ino);
2106         }
2107         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2108                 if ((buflen -= 8) < 0)
2109                         goto out_resource;
2110                 WRITE64((u64) statfs.f_ffree);
2111         }
2112         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2113                 if ((buflen -= 8) < 0)
2114                         goto out_resource;
2115                 WRITE64((u64) statfs.f_ffree);
2116         }
2117         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2118                 if ((buflen -= 8) < 0)
2119                         goto out_resource;
2120                 WRITE64((u64) statfs.f_files);
2121         }
2122         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2123                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2124                 if (status == nfserr_resource)
2125                         goto out_resource;
2126                 if (status)
2127                         goto out;
2128         }
2129         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2130                 if ((buflen -= 4) < 0)
2131                         goto out_resource;
2132                 WRITE32(1);
2133         }
2134         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2135                 if ((buflen -= 8) < 0)
2136                         goto out_resource;
2137                 WRITE64(~(u64)0);
2138         }
2139         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2140                 if ((buflen -= 4) < 0)
2141                         goto out_resource;
2142                 WRITE32(255);
2143         }
2144         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2145                 if ((buflen -= 4) < 0)
2146                         goto out_resource;
2147                 WRITE32(statfs.f_namelen);
2148         }
2149         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2150                 if ((buflen -= 8) < 0)
2151                         goto out_resource;
2152                 WRITE64((u64) svc_max_payload(rqstp));
2153         }
2154         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2155                 if ((buflen -= 8) < 0)
2156                         goto out_resource;
2157                 WRITE64((u64) svc_max_payload(rqstp));
2158         }
2159         if (bmval1 & FATTR4_WORD1_MODE) {
2160                 if ((buflen -= 4) < 0)
2161                         goto out_resource;
2162                 WRITE32(stat.mode & S_IALLUGO);
2163         }
2164         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2165                 if ((buflen -= 4) < 0)
2166                         goto out_resource;
2167                 WRITE32(1);
2168         }
2169         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2170                 if ((buflen -= 4) < 0)
2171                         goto out_resource;
2172                 WRITE32(stat.nlink);
2173         }
2174         if (bmval1 & FATTR4_WORD1_OWNER) {
2175                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2176                 if (status == nfserr_resource)
2177                         goto out_resource;
2178                 if (status)
2179                         goto out;
2180         }
2181         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2182                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2183                 if (status == nfserr_resource)
2184                         goto out_resource;
2185                 if (status)
2186                         goto out;
2187         }
2188         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2189                 if ((buflen -= 8) < 0)
2190                         goto out_resource;
2191                 WRITE32((u32) MAJOR(stat.rdev));
2192                 WRITE32((u32) MINOR(stat.rdev));
2193         }
2194         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2195                 if ((buflen -= 8) < 0)
2196                         goto out_resource;
2197                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2198                 WRITE64(dummy64);
2199         }
2200         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2201                 if ((buflen -= 8) < 0)
2202                         goto out_resource;
2203                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2204                 WRITE64(dummy64);
2205         }
2206         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2207                 if ((buflen -= 8) < 0)
2208                         goto out_resource;
2209                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2210                 WRITE64(dummy64);
2211         }
2212         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2213                 if ((buflen -= 8) < 0)
2214                         goto out_resource;
2215                 dummy64 = (u64)stat.blocks << 9;
2216                 WRITE64(dummy64);
2217         }
2218         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2219                 if ((buflen -= 12) < 0)
2220                         goto out_resource;
2221                 WRITE32(0);
2222                 WRITE32(stat.atime.tv_sec);
2223                 WRITE32(stat.atime.tv_nsec);
2224         }
2225         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2226                 if ((buflen -= 12) < 0)
2227                         goto out_resource;
2228                 WRITE32(0);
2229                 WRITE32(1);
2230                 WRITE32(0);
2231         }
2232         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2233                 if ((buflen -= 12) < 0)
2234                         goto out_resource;
2235                 WRITE32(0);
2236                 WRITE32(stat.ctime.tv_sec);
2237                 WRITE32(stat.ctime.tv_nsec);
2238         }
2239         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2240                 if ((buflen -= 12) < 0)
2241                         goto out_resource;
2242                 WRITE32(0);
2243                 WRITE32(stat.mtime.tv_sec);
2244                 WRITE32(stat.mtime.tv_nsec);
2245         }
2246         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2247                 if ((buflen -= 8) < 0)
2248                         goto out_resource;
2249                 /*
2250                  * Get parent's attributes if not ignoring crossmount
2251                  * and this is the root of a cross-mounted filesystem.
2252                  */
2253                 if (ignore_crossmnt == 0 &&
2254                     dentry == exp->ex_path.mnt->mnt_root) {
2255                         struct path path = exp->ex_path;
2256                         path_get(&path);
2257                         while (follow_up(&path)) {
2258                                 if (path.dentry != path.mnt->mnt_root)
2259                                         break;
2260                         }
2261                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2262                         path_put(&path);
2263                         if (err)
2264                                 goto out_nfserr;
2265                 }
2266                 WRITE64(stat.ino);
2267         }
2268         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2269                 WRITE32(3);
2270                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2271                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2272                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2273         }
2274
2275         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2276         *countp = p - buffer;
2277         status = nfs_ok;
2278
2279 out:
2280         kfree(acl);
2281         if (fhp == &tempfh)
2282                 fh_put(&tempfh);
2283         return status;
2284 out_nfserr:
2285         status = nfserrno(err);
2286         goto out;
2287 out_resource:
2288         *countp = 0;
2289         status = nfserr_resource;
2290         goto out;
2291 out_serverfault:
2292         status = nfserr_serverfault;
2293         goto out;
2294 }
2295
2296 static inline int attributes_need_mount(u32 *bmval)
2297 {
2298         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2299                 return 1;
2300         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2301                 return 1;
2302         return 0;
2303 }
2304
2305 static __be32
2306 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2307                 const char *name, int namlen, __be32 *p, int *buflen)
2308 {
2309         struct svc_export *exp = cd->rd_fhp->fh_export;
2310         struct dentry *dentry;
2311         __be32 nfserr;
2312         int ignore_crossmnt = 0;
2313
2314         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2315         if (IS_ERR(dentry))
2316                 return nfserrno(PTR_ERR(dentry));
2317         if (!dentry->d_inode) {
2318                 /*
2319                  * nfsd_buffered_readdir drops the i_mutex between
2320                  * readdir and calling this callback, leaving a window
2321                  * where this directory entry could have gone away.
2322                  */
2323                 dput(dentry);
2324                 return nfserr_noent;
2325         }
2326
2327         exp_get(exp);
2328         /*
2329          * In the case of a mountpoint, the client may be asking for
2330          * attributes that are only properties of the underlying filesystem
2331          * as opposed to the cross-mounted file system. In such a case,
2332          * we will not follow the cross mount and will fill the attribtutes
2333          * directly from the mountpoint dentry.
2334          */
2335         if (nfsd_mountpoint(dentry, exp)) {
2336                 int err;
2337
2338                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2339                                 && !attributes_need_mount(cd->rd_bmval)) {
2340                         ignore_crossmnt = 1;
2341                         goto out_encode;
2342                 }
2343                 /*
2344                  * Why the heck aren't we just using nfsd_lookup??
2345                  * Different "."/".." handling?  Something else?
2346                  * At least, add a comment here to explain....
2347                  */
2348                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2349                 if (err) {
2350                         nfserr = nfserrno(err);
2351                         goto out_put;
2352                 }
2353                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2354                 if (nfserr)
2355                         goto out_put;
2356
2357         }
2358 out_encode:
2359         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2360                                         cd->rd_rqstp, ignore_crossmnt);
2361 out_put:
2362         dput(dentry);
2363         exp_put(exp);
2364         return nfserr;
2365 }
2366
2367 static __be32 *
2368 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2369 {
2370         __be32 *attrlenp;
2371
2372         if (buflen < 6)
2373                 return NULL;
2374         *p++ = htonl(2);
2375         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2376         *p++ = htonl(0);                         /* bmval1 */
2377
2378         attrlenp = p++;
2379         *p++ = nfserr;       /* no htonl */
2380         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2381         return p;
2382 }
2383
2384 static int
2385 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2386                     loff_t offset, u64 ino, unsigned int d_type)
2387 {
2388         struct readdir_cd *ccd = ccdv;
2389         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2390         int buflen;
2391         __be32 *p = cd->buffer;
2392         __be32 *cookiep;
2393         __be32 nfserr = nfserr_toosmall;
2394
2395         /* In nfsv4, "." and ".." never make it onto the wire.. */
2396         if (name && isdotent(name, namlen)) {
2397                 cd->common.err = nfs_ok;
2398                 return 0;
2399         }
2400
2401         if (cd->offset)
2402                 xdr_encode_hyper(cd->offset, (u64) offset);
2403
2404         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2405         if (buflen < 0)
2406                 goto fail;
2407
2408         *p++ = xdr_one;                             /* mark entry present */
2409         cookiep = p;
2410         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2411         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2412
2413         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2414         switch (nfserr) {
2415         case nfs_ok:
2416                 p += buflen;
2417                 break;
2418         case nfserr_resource:
2419                 nfserr = nfserr_toosmall;
2420                 goto fail;
2421         case nfserr_noent:
2422                 goto skip_entry;
2423         default:
2424                 /*
2425                  * If the client requested the RDATTR_ERROR attribute,
2426                  * we stuff the error code into this attribute
2427                  * and continue.  If this attribute was not requested,
2428                  * then in accordance with the spec, we fail the
2429                  * entire READDIR operation(!)
2430                  */
2431                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2432                         goto fail;
2433                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2434                 if (p == NULL) {
2435                         nfserr = nfserr_toosmall;
2436                         goto fail;
2437                 }
2438         }
2439         cd->buflen -= (p - cd->buffer);
2440         cd->buffer = p;
2441         cd->offset = cookiep;
2442 skip_entry:
2443         cd->common.err = nfs_ok;
2444         return 0;
2445 fail:
2446         cd->common.err = nfserr;
2447         return -EINVAL;
2448 }
2449
2450 static void
2451 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2452 {
2453         __be32 *p;
2454
2455         RESERVE_SPACE(sizeof(stateid_t));
2456         WRITE32(sid->si_generation);
2457         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2458         ADJUST_ARGS();
2459 }
2460
2461 static __be32
2462 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2463 {
2464         __be32 *p;
2465
2466         if (!nfserr) {
2467                 RESERVE_SPACE(8);
2468                 WRITE32(access->ac_supported);
2469                 WRITE32(access->ac_resp_access);
2470                 ADJUST_ARGS();
2471         }
2472         return nfserr;
2473 }
2474
2475 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2476 {
2477         __be32 *p;
2478
2479         if (!nfserr) {
2480                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2481                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2482                 WRITE32(bcts->dir);
2483                 /* XXX: ? */
2484                 WRITE32(0);
2485                 ADJUST_ARGS();
2486         }
2487         return nfserr;
2488 }
2489
2490 static __be32
2491 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2492 {
2493         ENCODE_SEQID_OP_HEAD;
2494
2495         if (!nfserr)
2496                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2497
2498         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2499         return nfserr;
2500 }
2501
2502
2503 static __be32
2504 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2505 {
2506         __be32 *p;
2507
2508         if (!nfserr) {
2509                 RESERVE_SPACE(8);
2510                 WRITEMEM(commit->co_verf.data, 8);
2511                 ADJUST_ARGS();
2512         }
2513         return nfserr;
2514 }
2515
2516 static __be32
2517 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2518 {
2519         __be32 *p;
2520
2521         if (!nfserr) {
2522                 RESERVE_SPACE(32);
2523                 write_cinfo(&p, &create->cr_cinfo);
2524                 WRITE32(2);
2525                 WRITE32(create->cr_bmval[0]);
2526                 WRITE32(create->cr_bmval[1]);
2527                 ADJUST_ARGS();
2528         }
2529         return nfserr;
2530 }
2531
2532 static __be32
2533 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2534 {
2535         struct svc_fh *fhp = getattr->ga_fhp;
2536         int buflen;
2537
2538         if (nfserr)
2539                 return nfserr;
2540
2541         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2542         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2543                                     resp->p, &buflen, getattr->ga_bmval,
2544                                     resp->rqstp, 0);
2545         if (!nfserr)
2546                 resp->p += buflen;
2547         return nfserr;
2548 }
2549
2550 static __be32
2551 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2552 {
2553         struct svc_fh *fhp = *fhpp;
2554         unsigned int len;
2555         __be32 *p;
2556
2557         if (!nfserr) {
2558                 len = fhp->fh_handle.fh_size;
2559                 RESERVE_SPACE(len + 4);
2560                 WRITE32(len);
2561                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2562                 ADJUST_ARGS();
2563         }
2564         return nfserr;
2565 }
2566
2567 /*
2568 * Including all fields other than the name, a LOCK4denied structure requires
2569 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2570 */
2571 static void
2572 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2573 {
2574         __be32 *p;
2575
2576         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2577         WRITE64(ld->ld_start);
2578         WRITE64(ld->ld_length);
2579         WRITE32(ld->ld_type);
2580         if (ld->ld_sop) {
2581                 WRITEMEM(&ld->ld_clientid, 8);
2582                 WRITE32(ld->ld_sop->so_owner.len);
2583                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2584                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2585         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2586                 WRITE64((u64)0); /* clientid */
2587                 WRITE32(0); /* length of owner name */
2588         }
2589         ADJUST_ARGS();
2590 }
2591
2592 static __be32
2593 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2594 {
2595         ENCODE_SEQID_OP_HEAD;
2596
2597         if (!nfserr)
2598                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2599         else if (nfserr == nfserr_denied)
2600                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2601
2602         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2603         return nfserr;
2604 }
2605
2606 static __be32
2607 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2608 {
2609         if (nfserr == nfserr_denied)
2610                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2611         return nfserr;
2612 }
2613
2614 static __be32
2615 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2616 {
2617         ENCODE_SEQID_OP_HEAD;
2618
2619         if (!nfserr)
2620                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2621
2622         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2623         return nfserr;
2624 }
2625
2626
2627 static __be32
2628 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2629 {
2630         __be32 *p;
2631
2632         if (!nfserr) {
2633                 RESERVE_SPACE(20);
2634                 write_cinfo(&p, &link->li_cinfo);
2635                 ADJUST_ARGS();
2636         }
2637         return nfserr;
2638 }
2639
2640
2641 static __be32
2642 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2643 {
2644         __be32 *p;
2645         ENCODE_SEQID_OP_HEAD;
2646
2647         if (nfserr)
2648                 goto out;
2649
2650         nfsd4_encode_stateid(resp, &open->op_stateid);
2651         RESERVE_SPACE(40);
2652         write_cinfo(&p, &open->op_cinfo);
2653         WRITE32(open->op_rflags);
2654         WRITE32(2);
2655         WRITE32(open->op_bmval[0]);
2656         WRITE32(open->op_bmval[1]);
2657         WRITE32(open->op_delegate_type);
2658         ADJUST_ARGS();
2659
2660         switch (open->op_delegate_type) {
2661         case NFS4_OPEN_DELEGATE_NONE:
2662                 break;
2663         case NFS4_OPEN_DELEGATE_READ:
2664                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2665                 RESERVE_SPACE(20);
2666                 WRITE32(open->op_recall);
2667
2668                 /*
2669                  * TODO: ACE's in delegations
2670                  */
2671                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2672                 WRITE32(0);
2673                 WRITE32(0);
2674                 WRITE32(0);   /* XXX: is NULL principal ok? */
2675                 ADJUST_ARGS();
2676                 break;
2677         case NFS4_OPEN_DELEGATE_WRITE:
2678                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2679                 RESERVE_SPACE(32);
2680                 WRITE32(0);
2681
2682                 /*
2683                  * TODO: space_limit's in delegations
2684                  */
2685                 WRITE32(NFS4_LIMIT_SIZE);
2686                 WRITE32(~(u32)0);
2687                 WRITE32(~(u32)0);
2688
2689                 /*
2690                  * TODO: ACE's in delegations
2691                  */
2692                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2693                 WRITE32(0);
2694                 WRITE32(0);
2695                 WRITE32(0);   /* XXX: is NULL principal ok? */
2696                 ADJUST_ARGS();
2697                 break;
2698         default:
2699                 BUG();
2700         }
2701         /* XXX save filehandle here */
2702 out:
2703         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2704         return nfserr;
2705 }
2706
2707 static __be32
2708 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2709 {
2710         ENCODE_SEQID_OP_HEAD;
2711
2712         if (!nfserr)
2713                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2714
2715         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2716         return nfserr;
2717 }
2718
2719 static __be32
2720 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2721 {
2722         ENCODE_SEQID_OP_HEAD;
2723
2724         if (!nfserr)
2725                 nfsd4_encode_stateid(resp, &od->od_stateid);
2726
2727         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2728         return nfserr;
2729 }
2730
2731 static __be32
2732 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2733                   struct nfsd4_read *read)
2734 {
2735         u32 eof;
2736         int v, pn;
2737         unsigned long maxcount;
2738         long len;
2739         __be32 *p;
2740
2741         if (nfserr)
2742                 return nfserr;
2743         if (resp->xbuf->page_len)
2744                 return nfserr_resource;
2745
2746         RESERVE_SPACE(8); /* eof flag and byte count */
2747
2748         maxcount = svc_max_payload(resp->rqstp);
2749         if (maxcount > read->rd_length)
2750                 maxcount = read->rd_length;
2751
2752         len = maxcount;
2753         v = 0;
2754         while (len > 0) {
2755                 pn = resp->rqstp->rq_resused++;
2756                 resp->rqstp->rq_vec[v].iov_base =
2757                         page_address(resp->rqstp->rq_respages[pn]);
2758                 resp->rqstp->rq_vec[v].iov_len =
2759                         len < PAGE_SIZE ? len : PAGE_SIZE;
2760                 v++;
2761                 len -= PAGE_SIZE;
2762         }
2763         read->rd_vlen = v;
2764
2765         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2766                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2767                         &maxcount);
2768
2769         if (nfserr)
2770                 return nfserr;
2771         eof = (read->rd_offset + maxcount >=
2772                read->rd_fhp->fh_dentry->d_inode->i_size);
2773
2774         WRITE32(eof);
2775         WRITE32(maxcount);
2776         ADJUST_ARGS();
2777         resp->xbuf->head[0].iov_len = (char*)p
2778                                         - (char*)resp->xbuf->head[0].iov_base;
2779         resp->xbuf->page_len = maxcount;
2780
2781         /* Use rest of head for padding and remaining ops: */
2782         resp->xbuf->tail[0].iov_base = p;
2783         resp->xbuf->tail[0].iov_len = 0;
2784         if (maxcount&3) {
2785                 RESERVE_SPACE(4);
2786                 WRITE32(0);
2787                 resp->xbuf->tail[0].iov_base += maxcount&3;
2788                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2789                 ADJUST_ARGS();
2790         }
2791         return 0;
2792 }
2793
2794 static __be32
2795 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2796 {
2797         int maxcount;
2798         char *page;
2799         __be32 *p;
2800
2801         if (nfserr)
2802                 return nfserr;
2803         if (resp->xbuf->page_len)
2804                 return nfserr_resource;
2805
2806         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2807
2808         maxcount = PAGE_SIZE;
2809         RESERVE_SPACE(4);
2810
2811         /*
2812          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2813          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2814          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2815          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2816          */
2817         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2818         if (nfserr == nfserr_isdir)
2819                 return nfserr_inval;
2820         if (nfserr)
2821                 return nfserr;
2822
2823         WRITE32(maxcount);
2824         ADJUST_ARGS();
2825         resp->xbuf->head[0].iov_len = (char*)p
2826                                 - (char*)resp->xbuf->head[0].iov_base;
2827         resp->xbuf->page_len = maxcount;
2828
2829         /* Use rest of head for padding and remaining ops: */
2830         resp->xbuf->tail[0].iov_base = p;
2831         resp->xbuf->tail[0].iov_len = 0;
2832         if (maxcount&3) {
2833                 RESERVE_SPACE(4);
2834                 WRITE32(0);
2835                 resp->xbuf->tail[0].iov_base += maxcount&3;
2836                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2837                 ADJUST_ARGS();
2838         }
2839         return 0;
2840 }
2841
2842 static __be32
2843 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2844 {
2845         int maxcount;
2846         loff_t offset;
2847         __be32 *page, *savep, *tailbase;
2848         __be32 *p;
2849
2850         if (nfserr)
2851                 return nfserr;
2852         if (resp->xbuf->page_len)
2853                 return nfserr_resource;
2854
2855         RESERVE_SPACE(8);  /* verifier */
2856         savep = p;
2857
2858         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2859         WRITE32(0);
2860         WRITE32(0);
2861         ADJUST_ARGS();
2862         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2863         tailbase = p;
2864
2865         maxcount = PAGE_SIZE;
2866         if (maxcount > readdir->rd_maxcount)
2867                 maxcount = readdir->rd_maxcount;
2868
2869         /*
2870          * Convert from bytes to words, account for the two words already
2871          * written, make sure to leave two words at the end for the next
2872          * pointer and eof field.
2873          */
2874         maxcount = (maxcount >> 2) - 4;
2875         if (maxcount < 0) {
2876                 nfserr =  nfserr_toosmall;
2877                 goto err_no_verf;
2878         }
2879
2880         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2881         readdir->common.err = 0;
2882         readdir->buflen = maxcount;
2883         readdir->buffer = page;
2884         readdir->offset = NULL;
2885
2886         offset = readdir->rd_cookie;
2887         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2888                               &offset,
2889                               &readdir->common, nfsd4_encode_dirent);
2890         if (nfserr == nfs_ok &&
2891             readdir->common.err == nfserr_toosmall &&
2892             readdir->buffer == page)
2893                 nfserr = nfserr_toosmall;
2894         if (nfserr)
2895                 goto err_no_verf;
2896
2897         if (readdir->offset)
2898                 xdr_encode_hyper(readdir->offset, offset);
2899
2900         p = readdir->buffer;
2901         *p++ = 0;       /* no more entries */
2902         *p++ = htonl(readdir->common.err == nfserr_eof);
2903         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2904                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2905
2906         /* Use rest of head for padding and remaining ops: */
2907         resp->xbuf->tail[0].iov_base = tailbase;
2908         resp->xbuf->tail[0].iov_len = 0;
2909         resp->p = resp->xbuf->tail[0].iov_base;
2910         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2911
2912         return 0;
2913 err_no_verf:
2914         p = savep;
2915         ADJUST_ARGS();
2916         return nfserr;
2917 }
2918
2919 static __be32
2920 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2921 {
2922         __be32 *p;
2923
2924         if (!nfserr) {
2925                 RESERVE_SPACE(20);
2926                 write_cinfo(&p, &remove->rm_cinfo);
2927                 ADJUST_ARGS();
2928         }
2929         return nfserr;
2930 }
2931
2932 static __be32
2933 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2934 {
2935         __be32 *p;
2936
2937         if (!nfserr) {
2938                 RESERVE_SPACE(40);
2939                 write_cinfo(&p, &rename->rn_sinfo);
2940                 write_cinfo(&p, &rename->rn_tinfo);
2941                 ADJUST_ARGS();
2942         }
2943         return nfserr;
2944 }
2945
2946 static __be32
2947 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
2948                          __be32 nfserr,struct svc_export *exp)
2949 {
2950         int i = 0;
2951         u32 nflavs;
2952         struct exp_flavor_info *flavs;
2953         struct exp_flavor_info def_flavs[2];
2954         __be32 *p;
2955
2956         if (nfserr)
2957                 goto out;
2958         if (exp->ex_nflavors) {
2959                 flavs = exp->ex_flavors;
2960                 nflavs = exp->ex_nflavors;
2961         } else { /* Handling of some defaults in absence of real secinfo: */
2962                 flavs = def_flavs;
2963                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2964                         nflavs = 2;
2965                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2966                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2967                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2968                         nflavs = 1;
2969                         flavs[0].pseudoflavor
2970                                         = svcauth_gss_flavor(exp->ex_client);
2971                 } else {
2972                         nflavs = 1;
2973                         flavs[0].pseudoflavor
2974                                         = exp->ex_client->flavour->flavour;
2975                 }
2976         }
2977
2978         RESERVE_SPACE(4);
2979         WRITE32(nflavs);
2980         ADJUST_ARGS();
2981         for (i = 0; i < nflavs; i++) {
2982                 u32 flav = flavs[i].pseudoflavor;
2983                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2984
2985                 if (gm) {
2986                         RESERVE_SPACE(4);
2987                         WRITE32(RPC_AUTH_GSS);
2988                         ADJUST_ARGS();
2989                         RESERVE_SPACE(4 + gm->gm_oid.len);
2990                         WRITE32(gm->gm_oid.len);
2991                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2992                         ADJUST_ARGS();
2993                         RESERVE_SPACE(4);
2994                         WRITE32(0); /* qop */
2995                         ADJUST_ARGS();
2996                         RESERVE_SPACE(4);
2997                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2998                         ADJUST_ARGS();
2999                         gss_mech_put(gm);
3000                 } else {
3001                         RESERVE_SPACE(4);
3002                         WRITE32(flav);
3003                         ADJUST_ARGS();
3004                 }
3005         }
3006 out:
3007         if (exp)
3008                 exp_put(exp);
3009         return nfserr;
3010 }
3011
3012 static __be32
3013 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3014                      struct nfsd4_secinfo *secinfo)
3015 {
3016         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3017 }
3018
3019 static __be32
3020 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3021                      struct nfsd4_secinfo_no_name *secinfo)
3022 {
3023         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3024 }
3025
3026 /*
3027  * The SETATTR encode routine is special -- it always encodes a bitmap,
3028  * regardless of the error status.
3029  */
3030 static __be32
3031 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3032 {
3033         __be32 *p;
3034
3035         RESERVE_SPACE(12);
3036         if (nfserr) {
3037                 WRITE32(2);
3038                 WRITE32(0);
3039                 WRITE32(0);
3040         }
3041         else {
3042                 WRITE32(2);
3043                 WRITE32(setattr->sa_bmval[0]);
3044                 WRITE32(setattr->sa_bmval[1]);
3045         }
3046         ADJUST_ARGS();
3047         return nfserr;
3048 }
3049
3050 static __be32
3051 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3052 {
3053         __be32 *p;
3054
3055         if (!nfserr) {
3056                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
3057                 WRITEMEM(&scd->se_clientid, 8);
3058                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
3059                 ADJUST_ARGS();
3060         }
3061         else if (nfserr == nfserr_clid_inuse) {
3062                 RESERVE_SPACE(8);
3063                 WRITE32(0);
3064                 WRITE32(0);
3065                 ADJUST_ARGS();
3066         }
3067         return nfserr;
3068 }
3069
3070 static __be32
3071 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3072 {
3073         __be32 *p;
3074
3075         if (!nfserr) {
3076                 RESERVE_SPACE(16);
3077                 WRITE32(write->wr_bytes_written);
3078                 WRITE32(write->wr_how_written);
3079                 WRITEMEM(write->wr_verifier.data, 8);
3080                 ADJUST_ARGS();
3081         }
3082         return nfserr;
3083 }
3084
3085 static __be32
3086 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3087                          struct nfsd4_exchange_id *exid)
3088 {
3089         __be32 *p;
3090         char *major_id;
3091         char *server_scope;
3092         int major_id_sz;
3093         int server_scope_sz;
3094         uint64_t minor_id = 0;
3095
3096         if (nfserr)
3097                 return nfserr;
3098
3099         major_id = utsname()->nodename;
3100         major_id_sz = strlen(major_id);
3101         server_scope = utsname()->nodename;
3102         server_scope_sz = strlen(server_scope);
3103
3104         RESERVE_SPACE(
3105                 8 /* eir_clientid */ +
3106                 4 /* eir_sequenceid */ +
3107                 4 /* eir_flags */ +
3108                 4 /* spr_how (SP4_NONE) */ +
3109                 8 /* so_minor_id */ +
3110                 4 /* so_major_id.len */ +
3111                 (XDR_QUADLEN(major_id_sz) * 4) +
3112                 4 /* eir_server_scope.len */ +
3113                 (XDR_QUADLEN(server_scope_sz) * 4) +
3114                 4 /* eir_server_impl_id.count (0) */);
3115
3116         WRITEMEM(&exid->clientid, 8);
3117         WRITE32(exid->seqid);
3118         WRITE32(exid->flags);
3119
3120         /* state_protect4_r. Currently only support SP4_NONE */
3121         BUG_ON(exid->spa_how != SP4_NONE);
3122         WRITE32(exid->spa_how);
3123
3124         /* The server_owner struct */
3125         WRITE64(minor_id);      /* Minor id */
3126         /* major id */
3127         WRITE32(major_id_sz);
3128         WRITEMEM(major_id, major_id_sz);
3129
3130         /* Server scope */
3131         WRITE32(server_scope_sz);
3132         WRITEMEM(server_scope, server_scope_sz);
3133
3134         /* Implementation id */
3135         WRITE32(0);     /* zero length nfs_impl_id4 array */
3136         ADJUST_ARGS();
3137         return 0;
3138 }
3139
3140 static __be32
3141 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3142                             struct nfsd4_create_session *sess)
3143 {
3144         __be32 *p;
3145
3146         if (nfserr)
3147                 return nfserr;
3148
3149         RESERVE_SPACE(24);
3150         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3151         WRITE32(sess->seqid);
3152         WRITE32(sess->flags);
3153         ADJUST_ARGS();
3154
3155         RESERVE_SPACE(28);
3156         WRITE32(0); /* headerpadsz */
3157         WRITE32(sess->fore_channel.maxreq_sz);
3158         WRITE32(sess->fore_channel.maxresp_sz);
3159         WRITE32(sess->fore_channel.maxresp_cached);
3160         WRITE32(sess->fore_channel.maxops);
3161         WRITE32(sess->fore_channel.maxreqs);
3162         WRITE32(sess->fore_channel.nr_rdma_attrs);
3163         ADJUST_ARGS();
3164
3165         if (sess->fore_channel.nr_rdma_attrs) {
3166                 RESERVE_SPACE(4);
3167                 WRITE32(sess->fore_channel.rdma_attrs);
3168                 ADJUST_ARGS();
3169         }
3170
3171         RESERVE_SPACE(28);
3172         WRITE32(0); /* headerpadsz */
3173         WRITE32(sess->back_channel.maxreq_sz);
3174         WRITE32(sess->back_channel.maxresp_sz);
3175         WRITE32(sess->back_channel.maxresp_cached);
3176         WRITE32(sess->back_channel.maxops);
3177         WRITE32(sess->back_channel.maxreqs);
3178         WRITE32(sess->back_channel.nr_rdma_attrs);
3179         ADJUST_ARGS();
3180
3181         if (sess->back_channel.nr_rdma_attrs) {
3182                 RESERVE_SPACE(4);
3183                 WRITE32(sess->back_channel.rdma_attrs);
3184                 ADJUST_ARGS();
3185         }
3186         return 0;
3187 }
3188
3189 static __be32
3190 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3191                              struct nfsd4_destroy_session *destroy_session)
3192 {
3193         return nfserr;
3194 }
3195
3196 static __be32
3197 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, int nfserr,
3198                           struct nfsd4_free_stateid *free_stateid)
3199 {
3200         __be32 *p;
3201
3202         if (nfserr)
3203                 return nfserr;
3204
3205         RESERVE_SPACE(4);
3206         WRITE32(nfserr);
3207         ADJUST_ARGS();
3208         return nfserr;
3209 }
3210
3211 static __be32
3212 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3213                       struct nfsd4_sequence *seq)
3214 {
3215         __be32 *p;
3216
3217         if (nfserr)
3218                 return nfserr;
3219
3220         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3221         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3222         WRITE32(seq->seqid);
3223         WRITE32(seq->slotid);
3224         WRITE32(seq->maxslots);
3225         /* For now: target_maxslots = maxslots */
3226         WRITE32(seq->maxslots);
3227         WRITE32(seq->status_flags);
3228
3229         ADJUST_ARGS();
3230         resp->cstate.datap = p; /* DRC cache data pointer */
3231         return 0;
3232 }
3233
3234 __be32
3235 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, int nfserr,
3236                           struct nfsd4_test_stateid *test_stateid)
3237 {
3238         struct nfsd4_compoundargs *argp;
3239         stateid_t si;
3240         __be32 *p;
3241         int i;
3242         int valid;
3243
3244         restore_buf(test_stateid->ts_saved_args, &test_stateid->ts_savedp);
3245         argp = test_stateid->ts_saved_args;
3246
3247         RESERVE_SPACE(4);
3248         *p++ = htonl(test_stateid->ts_num_ids);
3249         resp->p = p;
3250
3251         nfs4_lock_state();
3252         for (i = 0; i < test_stateid->ts_num_ids; i++) {
3253                 nfsd4_decode_stateid(argp, &si);
3254                 valid = nfs4_validate_stateid(&si, test_stateid->ts_has_session);
3255                 RESERVE_SPACE(4);
3256                 *p++ = htonl(valid);
3257                 resp->p = p;
3258         }
3259         nfs4_unlock_state();
3260
3261         return nfserr;
3262 }
3263
3264 static __be32
3265 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3266 {
3267         return nfserr;
3268 }
3269
3270 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3271
3272 /*
3273  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3274  * since we don't need to filter out obsolete ops as this is
3275  * done in the decoding phase.
3276  */
3277 static nfsd4_enc nfsd4_enc_ops[] = {
3278         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3279         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3280         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3281         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3282         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3283         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3284         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3285         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3286         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3287         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3288         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3289         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3290         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3291         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3292         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3293         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3294         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3295         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3296         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3297         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3298         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3299         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3300         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3301         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3302         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3303         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3304         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3305         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3306         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3307         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3308         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3309         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3310         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3311         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3312         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3313         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3314         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3315
3316         /* NFSv4.1 operations */
3317         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3318         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3319         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3320         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3321         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3322         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3323         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3324         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3325         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3326         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3327         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3328         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3329         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3330         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3331         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3332         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3333         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3334         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3335         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3336 };
3337
3338 /*
3339  * Calculate the total amount of memory that the compound response has taken
3340  * after encoding the current operation.
3341  *
3342  * pad: add on 8 bytes for the next operation's op_code and status so that
3343  * there is room to cache a failure on the next operation.
3344  *
3345  * Compare this length to the session se_fmaxresp_cached.
3346  *
3347  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3348  * will be at least a page and will therefore hold the xdr_buf head.
3349  */
3350 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3351 {
3352         int status = 0;
3353         struct xdr_buf *xb = &resp->rqstp->rq_res;
3354         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3355         struct nfsd4_session *session = NULL;
3356         struct nfsd4_slot *slot = resp->cstate.slot;
3357         u32 length, tlen = 0, pad = 8;
3358
3359         if (!nfsd4_has_session(&resp->cstate))
3360                 return status;
3361
3362         session = resp->cstate.session;
3363         if (session == NULL || slot->sl_cachethis == 0)
3364                 return status;
3365
3366         if (resp->opcnt >= args->opcnt)
3367                 pad = 0; /* this is the last operation */
3368
3369         if (xb->page_len == 0) {
3370                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3371         } else {
3372                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3373                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3374
3375                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3376         }
3377         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3378                 length, xb->page_len, tlen, pad);
3379
3380         if (length <= session->se_fchannel.maxresp_cached)
3381                 return status;
3382         else
3383                 return nfserr_rep_too_big_to_cache;
3384 }
3385
3386 void
3387 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3388 {
3389         __be32 *statp;
3390         __be32 *p;
3391
3392         RESERVE_SPACE(8);
3393         WRITE32(op->opnum);
3394         statp = p++;    /* to be backfilled at the end */
3395         ADJUST_ARGS();
3396
3397         if (op->opnum == OP_ILLEGAL)
3398                 goto status;
3399         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3400                !nfsd4_enc_ops[op->opnum]);
3401         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3402         /* nfsd4_check_drc_limit guarantees enough room for error status */
3403         if (!op->status && nfsd4_check_drc_limit(resp))
3404                 op->status = nfserr_rep_too_big_to_cache;
3405 status:
3406         /*
3407          * Note: We write the status directly, instead of using WRITE32(),
3408          * since it is already in network byte order.
3409          */
3410         *statp = op->status;
3411 }
3412
3413 /*
3414  * Encode the reply stored in the stateowner reply cache
3415  *
3416  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3417  * previously sent already encoded operation.
3418  *
3419  * called with nfs4_lock_state() held
3420  */
3421 void
3422 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3423 {
3424         __be32 *p;
3425         struct nfs4_replay *rp = op->replay;
3426
3427         BUG_ON(!rp);
3428
3429         RESERVE_SPACE(8);
3430         WRITE32(op->opnum);
3431         *p++ = rp->rp_status;  /* already xdr'ed */
3432         ADJUST_ARGS();
3433
3434         RESERVE_SPACE(rp->rp_buflen);
3435         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3436         ADJUST_ARGS();
3437 }
3438
3439 int
3440 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3441 {
3442         return xdr_ressize_check(rqstp, p);
3443 }
3444
3445 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3446 {
3447         struct svc_rqst *rqstp = rq;
3448         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3449
3450         if (args->ops != args->iops) {
3451                 kfree(args->ops);
3452                 args->ops = args->iops;
3453         }
3454         kfree(args->tmpp);
3455         args->tmpp = NULL;
3456         while (args->to_free) {
3457                 struct tmpbuf *tb = args->to_free;
3458                 args->to_free = tb->next;
3459                 tb->release(tb->buf);
3460                 kfree(tb);
3461         }
3462         return 1;
3463 }
3464
3465 int
3466 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3467 {
3468         args->p = p;
3469         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3470         args->pagelist = rqstp->rq_arg.pages;
3471         args->pagelen = rqstp->rq_arg.page_len;
3472         args->tmpp = NULL;
3473         args->to_free = NULL;
3474         args->ops = args->iops;
3475         args->rqstp = rqstp;
3476
3477         return !nfsd4_decode_compound(args);
3478 }
3479
3480 int
3481 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3482 {
3483         /*
3484          * All that remains is to write the tag and operation count...
3485          */
3486         struct nfsd4_compound_state *cs = &resp->cstate;
3487         struct kvec *iov;
3488         p = resp->tagp;
3489         *p++ = htonl(resp->taglen);
3490         memcpy(p, resp->tag, resp->taglen);
3491         p += XDR_QUADLEN(resp->taglen);
3492         *p++ = htonl(resp->opcnt);
3493
3494         if (rqstp->rq_res.page_len)
3495                 iov = &rqstp->rq_res.tail[0];
3496         else
3497                 iov = &rqstp->rq_res.head[0];
3498         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3499         BUG_ON(iov->iov_len > PAGE_SIZE);
3500         if (nfsd4_has_session(cs)) {
3501                 if (cs->status != nfserr_replay_cache) {
3502                         nfsd4_store_cache_entry(resp);
3503                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3504                         cs->slot->sl_inuse = false;
3505                 }
3506                 /* Renew the clientid on success and on replay */
3507                 release_session_client(cs->session);
3508                 nfsd4_put_session(cs->session);
3509         }
3510         return 1;
3511 }
3512
3513 /*
3514  * Local variables:
3515  *  c-basic-offset: 8
3516  * End:
3517  */