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(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_ftypes[16] = {
1764         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1765         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1766         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1767         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1768 };
1769
1770 static __be32
1771 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1772                         __be32 **p, int *buflen)
1773 {
1774         int status;
1775
1776         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1777                 return nfserr_resource;
1778         if (whotype != NFS4_ACL_WHO_NAMED)
1779                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1780         else if (group)
1781                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1782         else
1783                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1784         if (status < 0)
1785                 return nfserrno(status);
1786         *p = xdr_encode_opaque(*p, NULL, status);
1787         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1788         BUG_ON(*buflen < 0);
1789         return 0;
1790 }
1791
1792 static inline __be32
1793 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1794 {
1795         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1796 }
1797
1798 static inline __be32
1799 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1800 {
1801         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1802 }
1803
1804 static inline __be32
1805 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1806                 __be32 **p, int *buflen)
1807 {
1808         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1809 }
1810
1811 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1812                               FATTR4_WORD0_RDATTR_ERROR)
1813 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1814
1815 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1816 {
1817         /* As per referral draft:  */
1818         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1819             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1820                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1821                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1822                         *rdattr_err = NFSERR_MOVED;
1823                 else
1824                         return nfserr_moved;
1825         }
1826         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1827         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1828         return 0;
1829 }
1830
1831 /*
1832  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1833  * ourselves.
1834  *
1835  * @countp is the buffer size in _words_; upon successful return this becomes
1836  * replaced with the number of words written.
1837  */
1838 __be32
1839 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1840                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1841                 struct svc_rqst *rqstp, int ignore_crossmnt)
1842 {
1843         u32 bmval0 = bmval[0];
1844         u32 bmval1 = bmval[1];
1845         u32 bmval2 = bmval[2];
1846         struct kstat stat;
1847         struct svc_fh tempfh;
1848         struct kstatfs statfs;
1849         int buflen = *countp << 2;
1850         __be32 *attrlenp;
1851         u32 dummy;
1852         u64 dummy64;
1853         u32 rdattr_err = 0;
1854         __be32 *p = buffer;
1855         __be32 status;
1856         int err;
1857         int aclsupport = 0;
1858         struct nfs4_acl *acl = NULL;
1859         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1860         u32 minorversion = resp->cstate.minorversion;
1861         struct path path = {
1862                 .mnt    = exp->ex_path.mnt,
1863                 .dentry = dentry,
1864         };
1865
1866         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1867         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1868         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1869         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1870
1871         if (exp->ex_fslocs.migrated) {
1872                 BUG_ON(bmval[2]);
1873                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1874                 if (status)
1875                         goto out;
1876         }
1877
1878         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1879         if (err)
1880                 goto out_nfserr;
1881         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1882                         FATTR4_WORD0_MAXNAME)) ||
1883             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1884                        FATTR4_WORD1_SPACE_TOTAL))) {
1885                 err = vfs_statfs(&path, &statfs);
1886                 if (err)
1887                         goto out_nfserr;
1888         }
1889         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1890                 fh_init(&tempfh, NFS4_FHSIZE);
1891                 status = fh_compose(&tempfh, exp, dentry, NULL);
1892                 if (status)
1893                         goto out;
1894                 fhp = &tempfh;
1895         }
1896         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1897                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1898                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1899                 aclsupport = (err == 0);
1900                 if (bmval0 & FATTR4_WORD0_ACL) {
1901                         if (err == -EOPNOTSUPP)
1902                                 bmval0 &= ~FATTR4_WORD0_ACL;
1903                         else if (err == -EINVAL) {
1904                                 status = nfserr_attrnotsupp;
1905                                 goto out;
1906                         } else if (err != 0)
1907                                 goto out_nfserr;
1908                 }
1909         }
1910
1911         if (bmval2) {
1912                 if ((buflen -= 16) < 0)
1913                         goto out_resource;
1914                 WRITE32(3);
1915                 WRITE32(bmval0);
1916                 WRITE32(bmval1);
1917                 WRITE32(bmval2);
1918         } else if (bmval1) {
1919                 if ((buflen -= 12) < 0)
1920                         goto out_resource;
1921                 WRITE32(2);
1922                 WRITE32(bmval0);
1923                 WRITE32(bmval1);
1924         } else {
1925                 if ((buflen -= 8) < 0)
1926                         goto out_resource;
1927                 WRITE32(1);
1928                 WRITE32(bmval0);
1929         }
1930         attrlenp = p++;                /* to be backfilled later */
1931
1932         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1933                 u32 word0 = nfsd_suppattrs0(minorversion);
1934                 u32 word1 = nfsd_suppattrs1(minorversion);
1935                 u32 word2 = nfsd_suppattrs2(minorversion);
1936
1937                 if (!aclsupport)
1938                         word0 &= ~FATTR4_WORD0_ACL;
1939                 if (!word2) {
1940                         if ((buflen -= 12) < 0)
1941                                 goto out_resource;
1942                         WRITE32(2);
1943                         WRITE32(word0);
1944                         WRITE32(word1);
1945                 } else {
1946                         if ((buflen -= 16) < 0)
1947                                 goto out_resource;
1948                         WRITE32(3);
1949                         WRITE32(word0);
1950                         WRITE32(word1);
1951                         WRITE32(word2);
1952                 }
1953         }
1954         if (bmval0 & FATTR4_WORD0_TYPE) {
1955                 if ((buflen -= 4) < 0)
1956                         goto out_resource;
1957                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1958                 if (dummy == NF4BAD)
1959                         goto out_serverfault;
1960                 WRITE32(dummy);
1961         }
1962         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1963                 if ((buflen -= 4) < 0)
1964                         goto out_resource;
1965                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1966                         WRITE32(NFS4_FH_PERSISTENT);
1967                 else
1968                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1969         }
1970         if (bmval0 & FATTR4_WORD0_CHANGE) {
1971                 if ((buflen -= 8) < 0)
1972                         goto out_resource;
1973                 write_change(&p, &stat, dentry->d_inode);
1974         }
1975         if (bmval0 & FATTR4_WORD0_SIZE) {
1976                 if ((buflen -= 8) < 0)
1977                         goto out_resource;
1978                 WRITE64(stat.size);
1979         }
1980         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1981                 if ((buflen -= 4) < 0)
1982                         goto out_resource;
1983                 WRITE32(1);
1984         }
1985         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1986                 if ((buflen -= 4) < 0)
1987                         goto out_resource;
1988                 WRITE32(1);
1989         }
1990         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1991                 if ((buflen -= 4) < 0)
1992                         goto out_resource;
1993                 WRITE32(0);
1994         }
1995         if (bmval0 & FATTR4_WORD0_FSID) {
1996                 if ((buflen -= 16) < 0)
1997                         goto out_resource;
1998                 if (exp->ex_fslocs.migrated) {
1999                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2000                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
2001                 } else switch(fsid_source(fhp)) {
2002                 case FSIDSOURCE_FSID:
2003                         WRITE64((u64)exp->ex_fsid);
2004                         WRITE64((u64)0);
2005                         break;
2006                 case FSIDSOURCE_DEV:
2007                         WRITE32(0);
2008                         WRITE32(MAJOR(stat.dev));
2009                         WRITE32(0);
2010                         WRITE32(MINOR(stat.dev));
2011                         break;
2012                 case FSIDSOURCE_UUID:
2013                         WRITEMEM(exp->ex_uuid, 16);
2014                         break;
2015                 }
2016         }
2017         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2018                 if ((buflen -= 4) < 0)
2019                         goto out_resource;
2020                 WRITE32(0);
2021         }
2022         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2023                 if ((buflen -= 4) < 0)
2024                         goto out_resource;
2025                 WRITE32(nfsd4_lease);
2026         }
2027         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2028                 if ((buflen -= 4) < 0)
2029                         goto out_resource;
2030                 WRITE32(rdattr_err);
2031         }
2032         if (bmval0 & FATTR4_WORD0_ACL) {
2033                 struct nfs4_ace *ace;
2034
2035                 if (acl == NULL) {
2036                         if ((buflen -= 4) < 0)
2037                                 goto out_resource;
2038
2039                         WRITE32(0);
2040                         goto out_acl;
2041                 }
2042                 if ((buflen -= 4) < 0)
2043                         goto out_resource;
2044                 WRITE32(acl->naces);
2045
2046                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2047                         if ((buflen -= 4*3) < 0)
2048                                 goto out_resource;
2049                         WRITE32(ace->type);
2050                         WRITE32(ace->flag);
2051                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2052                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
2053                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2054                                 &p, &buflen);
2055                         if (status == nfserr_resource)
2056                                 goto out_resource;
2057                         if (status)
2058                                 goto out;
2059                 }
2060         }
2061 out_acl:
2062         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2063                 if ((buflen -= 4) < 0)
2064                         goto out_resource;
2065                 WRITE32(aclsupport ?
2066                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2067         }
2068         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2069                 if ((buflen -= 4) < 0)
2070                         goto out_resource;
2071                 WRITE32(1);
2072         }
2073         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2074                 if ((buflen -= 4) < 0)
2075                         goto out_resource;
2076                 WRITE32(1);
2077         }
2078         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2079                 if ((buflen -= 4) < 0)
2080                         goto out_resource;
2081                 WRITE32(1);
2082         }
2083         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2084                 if ((buflen -= 4) < 0)
2085                         goto out_resource;
2086                 WRITE32(1);
2087         }
2088         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2089                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2090                 if (buflen < 0)
2091                         goto out_resource;
2092                 WRITE32(fhp->fh_handle.fh_size);
2093                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2094         }
2095         if (bmval0 & FATTR4_WORD0_FILEID) {
2096                 if ((buflen -= 8) < 0)
2097                         goto out_resource;
2098                 WRITE64(stat.ino);
2099         }
2100         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2101                 if ((buflen -= 8) < 0)
2102                         goto out_resource;
2103                 WRITE64((u64) statfs.f_ffree);
2104         }
2105         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2106                 if ((buflen -= 8) < 0)
2107                         goto out_resource;
2108                 WRITE64((u64) statfs.f_ffree);
2109         }
2110         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2111                 if ((buflen -= 8) < 0)
2112                         goto out_resource;
2113                 WRITE64((u64) statfs.f_files);
2114         }
2115         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2116                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2117                 if (status == nfserr_resource)
2118                         goto out_resource;
2119                 if (status)
2120                         goto out;
2121         }
2122         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2123                 if ((buflen -= 4) < 0)
2124                         goto out_resource;
2125                 WRITE32(1);
2126         }
2127         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2128                 if ((buflen -= 8) < 0)
2129                         goto out_resource;
2130                 WRITE64(~(u64)0);
2131         }
2132         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2133                 if ((buflen -= 4) < 0)
2134                         goto out_resource;
2135                 WRITE32(255);
2136         }
2137         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2138                 if ((buflen -= 4) < 0)
2139                         goto out_resource;
2140                 WRITE32(statfs.f_namelen);
2141         }
2142         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2143                 if ((buflen -= 8) < 0)
2144                         goto out_resource;
2145                 WRITE64((u64) svc_max_payload(rqstp));
2146         }
2147         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2148                 if ((buflen -= 8) < 0)
2149                         goto out_resource;
2150                 WRITE64((u64) svc_max_payload(rqstp));
2151         }
2152         if (bmval1 & FATTR4_WORD1_MODE) {
2153                 if ((buflen -= 4) < 0)
2154                         goto out_resource;
2155                 WRITE32(stat.mode & S_IALLUGO);
2156         }
2157         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2158                 if ((buflen -= 4) < 0)
2159                         goto out_resource;
2160                 WRITE32(1);
2161         }
2162         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2163                 if ((buflen -= 4) < 0)
2164                         goto out_resource;
2165                 WRITE32(stat.nlink);
2166         }
2167         if (bmval1 & FATTR4_WORD1_OWNER) {
2168                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2169                 if (status == nfserr_resource)
2170                         goto out_resource;
2171                 if (status)
2172                         goto out;
2173         }
2174         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2175                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2176                 if (status == nfserr_resource)
2177                         goto out_resource;
2178                 if (status)
2179                         goto out;
2180         }
2181         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2182                 if ((buflen -= 8) < 0)
2183                         goto out_resource;
2184                 WRITE32((u32) MAJOR(stat.rdev));
2185                 WRITE32((u32) MINOR(stat.rdev));
2186         }
2187         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2188                 if ((buflen -= 8) < 0)
2189                         goto out_resource;
2190                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2191                 WRITE64(dummy64);
2192         }
2193         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2194                 if ((buflen -= 8) < 0)
2195                         goto out_resource;
2196                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2197                 WRITE64(dummy64);
2198         }
2199         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2200                 if ((buflen -= 8) < 0)
2201                         goto out_resource;
2202                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2203                 WRITE64(dummy64);
2204         }
2205         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2206                 if ((buflen -= 8) < 0)
2207                         goto out_resource;
2208                 dummy64 = (u64)stat.blocks << 9;
2209                 WRITE64(dummy64);
2210         }
2211         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2212                 if ((buflen -= 12) < 0)
2213                         goto out_resource;
2214                 WRITE32(0);
2215                 WRITE32(stat.atime.tv_sec);
2216                 WRITE32(stat.atime.tv_nsec);
2217         }
2218         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2219                 if ((buflen -= 12) < 0)
2220                         goto out_resource;
2221                 WRITE32(0);
2222                 WRITE32(1);
2223                 WRITE32(0);
2224         }
2225         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2226                 if ((buflen -= 12) < 0)
2227                         goto out_resource;
2228                 WRITE32(0);
2229                 WRITE32(stat.ctime.tv_sec);
2230                 WRITE32(stat.ctime.tv_nsec);
2231         }
2232         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2233                 if ((buflen -= 12) < 0)
2234                         goto out_resource;
2235                 WRITE32(0);
2236                 WRITE32(stat.mtime.tv_sec);
2237                 WRITE32(stat.mtime.tv_nsec);
2238         }
2239         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2240                 if ((buflen -= 8) < 0)
2241                         goto out_resource;
2242                 /*
2243                  * Get parent's attributes if not ignoring crossmount
2244                  * and this is the root of a cross-mounted filesystem.
2245                  */
2246                 if (ignore_crossmnt == 0 &&
2247                     dentry == exp->ex_path.mnt->mnt_root) {
2248                         struct path path = exp->ex_path;
2249                         path_get(&path);
2250                         while (follow_up(&path)) {
2251                                 if (path.dentry != path.mnt->mnt_root)
2252                                         break;
2253                         }
2254                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2255                         path_put(&path);
2256                         if (err)
2257                                 goto out_nfserr;
2258                 }
2259                 WRITE64(stat.ino);
2260         }
2261         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2262                 WRITE32(3);
2263                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2264                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2265                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2266         }
2267
2268         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2269         *countp = p - buffer;
2270         status = nfs_ok;
2271
2272 out:
2273         kfree(acl);
2274         if (fhp == &tempfh)
2275                 fh_put(&tempfh);
2276         return status;
2277 out_nfserr:
2278         status = nfserrno(err);
2279         goto out;
2280 out_resource:
2281         *countp = 0;
2282         status = nfserr_resource;
2283         goto out;
2284 out_serverfault:
2285         status = nfserr_serverfault;
2286         goto out;
2287 }
2288
2289 static inline int attributes_need_mount(u32 *bmval)
2290 {
2291         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2292                 return 1;
2293         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2294                 return 1;
2295         return 0;
2296 }
2297
2298 static __be32
2299 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2300                 const char *name, int namlen, __be32 *p, int *buflen)
2301 {
2302         struct svc_export *exp = cd->rd_fhp->fh_export;
2303         struct dentry *dentry;
2304         __be32 nfserr;
2305         int ignore_crossmnt = 0;
2306
2307         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2308         if (IS_ERR(dentry))
2309                 return nfserrno(PTR_ERR(dentry));
2310         if (!dentry->d_inode) {
2311                 /*
2312                  * nfsd_buffered_readdir drops the i_mutex between
2313                  * readdir and calling this callback, leaving a window
2314                  * where this directory entry could have gone away.
2315                  */
2316                 dput(dentry);
2317                 return nfserr_noent;
2318         }
2319
2320         exp_get(exp);
2321         /*
2322          * In the case of a mountpoint, the client may be asking for
2323          * attributes that are only properties of the underlying filesystem
2324          * as opposed to the cross-mounted file system. In such a case,
2325          * we will not follow the cross mount and will fill the attribtutes
2326          * directly from the mountpoint dentry.
2327          */
2328         if (nfsd_mountpoint(dentry, exp)) {
2329                 int err;
2330
2331                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2332                                 && !attributes_need_mount(cd->rd_bmval)) {
2333                         ignore_crossmnt = 1;
2334                         goto out_encode;
2335                 }
2336                 /*
2337                  * Why the heck aren't we just using nfsd_lookup??
2338                  * Different "."/".." handling?  Something else?
2339                  * At least, add a comment here to explain....
2340                  */
2341                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2342                 if (err) {
2343                         nfserr = nfserrno(err);
2344                         goto out_put;
2345                 }
2346                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2347                 if (nfserr)
2348                         goto out_put;
2349
2350         }
2351 out_encode:
2352         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2353                                         cd->rd_rqstp, ignore_crossmnt);
2354 out_put:
2355         dput(dentry);
2356         exp_put(exp);
2357         return nfserr;
2358 }
2359
2360 static __be32 *
2361 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2362 {
2363         __be32 *attrlenp;
2364
2365         if (buflen < 6)
2366                 return NULL;
2367         *p++ = htonl(2);
2368         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2369         *p++ = htonl(0);                         /* bmval1 */
2370
2371         attrlenp = p++;
2372         *p++ = nfserr;       /* no htonl */
2373         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2374         return p;
2375 }
2376
2377 static int
2378 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2379                     loff_t offset, u64 ino, unsigned int d_type)
2380 {
2381         struct readdir_cd *ccd = ccdv;
2382         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2383         int buflen;
2384         __be32 *p = cd->buffer;
2385         __be32 *cookiep;
2386         __be32 nfserr = nfserr_toosmall;
2387
2388         /* In nfsv4, "." and ".." never make it onto the wire.. */
2389         if (name && isdotent(name, namlen)) {
2390                 cd->common.err = nfs_ok;
2391                 return 0;
2392         }
2393
2394         if (cd->offset)
2395                 xdr_encode_hyper(cd->offset, (u64) offset);
2396
2397         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2398         if (buflen < 0)
2399                 goto fail;
2400
2401         *p++ = xdr_one;                             /* mark entry present */
2402         cookiep = p;
2403         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2404         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2405
2406         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2407         switch (nfserr) {
2408         case nfs_ok:
2409                 p += buflen;
2410                 break;
2411         case nfserr_resource:
2412                 nfserr = nfserr_toosmall;
2413                 goto fail;
2414         case nfserr_noent:
2415                 goto skip_entry;
2416         default:
2417                 /*
2418                  * If the client requested the RDATTR_ERROR attribute,
2419                  * we stuff the error code into this attribute
2420                  * and continue.  If this attribute was not requested,
2421                  * then in accordance with the spec, we fail the
2422                  * entire READDIR operation(!)
2423                  */
2424                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2425                         goto fail;
2426                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2427                 if (p == NULL) {
2428                         nfserr = nfserr_toosmall;
2429                         goto fail;
2430                 }
2431         }
2432         cd->buflen -= (p - cd->buffer);
2433         cd->buffer = p;
2434         cd->offset = cookiep;
2435 skip_entry:
2436         cd->common.err = nfs_ok;
2437         return 0;
2438 fail:
2439         cd->common.err = nfserr;
2440         return -EINVAL;
2441 }
2442
2443 static void
2444 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2445 {
2446         __be32 *p;
2447
2448         RESERVE_SPACE(sizeof(stateid_t));
2449         WRITE32(sid->si_generation);
2450         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2451         ADJUST_ARGS();
2452 }
2453
2454 static __be32
2455 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2456 {
2457         __be32 *p;
2458
2459         if (!nfserr) {
2460                 RESERVE_SPACE(8);
2461                 WRITE32(access->ac_supported);
2462                 WRITE32(access->ac_resp_access);
2463                 ADJUST_ARGS();
2464         }
2465         return nfserr;
2466 }
2467
2468 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2469 {
2470         __be32 *p;
2471
2472         if (!nfserr) {
2473                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2474                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2475                 WRITE32(bcts->dir);
2476                 /* XXX: ? */
2477                 WRITE32(0);
2478                 ADJUST_ARGS();
2479         }
2480         return nfserr;
2481 }
2482
2483 static __be32
2484 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2485 {
2486         ENCODE_SEQID_OP_HEAD;
2487
2488         if (!nfserr)
2489                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2490
2491         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2492         return nfserr;
2493 }
2494
2495
2496 static __be32
2497 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2498 {
2499         __be32 *p;
2500
2501         if (!nfserr) {
2502                 RESERVE_SPACE(8);
2503                 WRITEMEM(commit->co_verf.data, 8);
2504                 ADJUST_ARGS();
2505         }
2506         return nfserr;
2507 }
2508
2509 static __be32
2510 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2511 {
2512         __be32 *p;
2513
2514         if (!nfserr) {
2515                 RESERVE_SPACE(32);
2516                 write_cinfo(&p, &create->cr_cinfo);
2517                 WRITE32(2);
2518                 WRITE32(create->cr_bmval[0]);
2519                 WRITE32(create->cr_bmval[1]);
2520                 ADJUST_ARGS();
2521         }
2522         return nfserr;
2523 }
2524
2525 static __be32
2526 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2527 {
2528         struct svc_fh *fhp = getattr->ga_fhp;
2529         int buflen;
2530
2531         if (nfserr)
2532                 return nfserr;
2533
2534         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2535         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2536                                     resp->p, &buflen, getattr->ga_bmval,
2537                                     resp->rqstp, 0);
2538         if (!nfserr)
2539                 resp->p += buflen;
2540         return nfserr;
2541 }
2542
2543 static __be32
2544 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2545 {
2546         struct svc_fh *fhp = *fhpp;
2547         unsigned int len;
2548         __be32 *p;
2549
2550         if (!nfserr) {
2551                 len = fhp->fh_handle.fh_size;
2552                 RESERVE_SPACE(len + 4);
2553                 WRITE32(len);
2554                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2555                 ADJUST_ARGS();
2556         }
2557         return nfserr;
2558 }
2559
2560 /*
2561 * Including all fields other than the name, a LOCK4denied structure requires
2562 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2563 */
2564 static void
2565 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2566 {
2567         __be32 *p;
2568
2569         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2570         WRITE64(ld->ld_start);
2571         WRITE64(ld->ld_length);
2572         WRITE32(ld->ld_type);
2573         if (ld->ld_sop) {
2574                 WRITEMEM(&ld->ld_clientid, 8);
2575                 WRITE32(ld->ld_sop->so_owner.len);
2576                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2577                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2578         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2579                 WRITE64((u64)0); /* clientid */
2580                 WRITE32(0); /* length of owner name */
2581         }
2582         ADJUST_ARGS();
2583 }
2584
2585 static __be32
2586 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2587 {
2588         ENCODE_SEQID_OP_HEAD;
2589
2590         if (!nfserr)
2591                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2592         else if (nfserr == nfserr_denied)
2593                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2594
2595         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2596         return nfserr;
2597 }
2598
2599 static __be32
2600 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2601 {
2602         if (nfserr == nfserr_denied)
2603                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2604         return nfserr;
2605 }
2606
2607 static __be32
2608 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2609 {
2610         ENCODE_SEQID_OP_HEAD;
2611
2612         if (!nfserr)
2613                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2614
2615         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2616         return nfserr;
2617 }
2618
2619
2620 static __be32
2621 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2622 {
2623         __be32 *p;
2624
2625         if (!nfserr) {
2626                 RESERVE_SPACE(20);
2627                 write_cinfo(&p, &link->li_cinfo);
2628                 ADJUST_ARGS();
2629         }
2630         return nfserr;
2631 }
2632
2633
2634 static __be32
2635 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2636 {
2637         __be32 *p;
2638         ENCODE_SEQID_OP_HEAD;
2639
2640         if (nfserr)
2641                 goto out;
2642
2643         nfsd4_encode_stateid(resp, &open->op_stateid);
2644         RESERVE_SPACE(40);
2645         write_cinfo(&p, &open->op_cinfo);
2646         WRITE32(open->op_rflags);
2647         WRITE32(2);
2648         WRITE32(open->op_bmval[0]);
2649         WRITE32(open->op_bmval[1]);
2650         WRITE32(open->op_delegate_type);
2651         ADJUST_ARGS();
2652
2653         switch (open->op_delegate_type) {
2654         case NFS4_OPEN_DELEGATE_NONE:
2655                 break;
2656         case NFS4_OPEN_DELEGATE_READ:
2657                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2658                 RESERVE_SPACE(20);
2659                 WRITE32(open->op_recall);
2660
2661                 /*
2662                  * TODO: ACE's in delegations
2663                  */
2664                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2665                 WRITE32(0);
2666                 WRITE32(0);
2667                 WRITE32(0);   /* XXX: is NULL principal ok? */
2668                 ADJUST_ARGS();
2669                 break;
2670         case NFS4_OPEN_DELEGATE_WRITE:
2671                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2672                 RESERVE_SPACE(32);
2673                 WRITE32(0);
2674
2675                 /*
2676                  * TODO: space_limit's in delegations
2677                  */
2678                 WRITE32(NFS4_LIMIT_SIZE);
2679                 WRITE32(~(u32)0);
2680                 WRITE32(~(u32)0);
2681
2682                 /*
2683                  * TODO: ACE's in delegations
2684                  */
2685                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2686                 WRITE32(0);
2687                 WRITE32(0);
2688                 WRITE32(0);   /* XXX: is NULL principal ok? */
2689                 ADJUST_ARGS();
2690                 break;
2691         default:
2692                 BUG();
2693         }
2694         /* XXX save filehandle here */
2695 out:
2696         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2697         return nfserr;
2698 }
2699
2700 static __be32
2701 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2702 {
2703         ENCODE_SEQID_OP_HEAD;
2704
2705         if (!nfserr)
2706                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2707
2708         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2709         return nfserr;
2710 }
2711
2712 static __be32
2713 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2714 {
2715         ENCODE_SEQID_OP_HEAD;
2716
2717         if (!nfserr)
2718                 nfsd4_encode_stateid(resp, &od->od_stateid);
2719
2720         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2721         return nfserr;
2722 }
2723
2724 static __be32
2725 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2726                   struct nfsd4_read *read)
2727 {
2728         u32 eof;
2729         int v, pn;
2730         unsigned long maxcount;
2731         long len;
2732         __be32 *p;
2733
2734         if (nfserr)
2735                 return nfserr;
2736         if (resp->xbuf->page_len)
2737                 return nfserr_resource;
2738
2739         RESERVE_SPACE(8); /* eof flag and byte count */
2740
2741         maxcount = svc_max_payload(resp->rqstp);
2742         if (maxcount > read->rd_length)
2743                 maxcount = read->rd_length;
2744
2745         len = maxcount;
2746         v = 0;
2747         while (len > 0) {
2748                 pn = resp->rqstp->rq_resused++;
2749                 resp->rqstp->rq_vec[v].iov_base =
2750                         page_address(resp->rqstp->rq_respages[pn]);
2751                 resp->rqstp->rq_vec[v].iov_len =
2752                         len < PAGE_SIZE ? len : PAGE_SIZE;
2753                 v++;
2754                 len -= PAGE_SIZE;
2755         }
2756         read->rd_vlen = v;
2757
2758         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2759                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2760                         &maxcount);
2761
2762         if (nfserr == nfserr_symlink)
2763                 nfserr = nfserr_inval;
2764         if (nfserr)
2765                 return nfserr;
2766         eof = (read->rd_offset + maxcount >=
2767                read->rd_fhp->fh_dentry->d_inode->i_size);
2768
2769         WRITE32(eof);
2770         WRITE32(maxcount);
2771         ADJUST_ARGS();
2772         resp->xbuf->head[0].iov_len = (char*)p
2773                                         - (char*)resp->xbuf->head[0].iov_base;
2774         resp->xbuf->page_len = maxcount;
2775
2776         /* Use rest of head for padding and remaining ops: */
2777         resp->xbuf->tail[0].iov_base = p;
2778         resp->xbuf->tail[0].iov_len = 0;
2779         if (maxcount&3) {
2780                 RESERVE_SPACE(4);
2781                 WRITE32(0);
2782                 resp->xbuf->tail[0].iov_base += maxcount&3;
2783                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2784                 ADJUST_ARGS();
2785         }
2786         return 0;
2787 }
2788
2789 static __be32
2790 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2791 {
2792         int maxcount;
2793         char *page;
2794         __be32 *p;
2795
2796         if (nfserr)
2797                 return nfserr;
2798         if (resp->xbuf->page_len)
2799                 return nfserr_resource;
2800
2801         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2802
2803         maxcount = PAGE_SIZE;
2804         RESERVE_SPACE(4);
2805
2806         /*
2807          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2808          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2809          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2810          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2811          */
2812         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2813         if (nfserr == nfserr_isdir)
2814                 return nfserr_inval;
2815         if (nfserr)
2816                 return nfserr;
2817
2818         WRITE32(maxcount);
2819         ADJUST_ARGS();
2820         resp->xbuf->head[0].iov_len = (char*)p
2821                                 - (char*)resp->xbuf->head[0].iov_base;
2822         resp->xbuf->page_len = maxcount;
2823
2824         /* Use rest of head for padding and remaining ops: */
2825         resp->xbuf->tail[0].iov_base = p;
2826         resp->xbuf->tail[0].iov_len = 0;
2827         if (maxcount&3) {
2828                 RESERVE_SPACE(4);
2829                 WRITE32(0);
2830                 resp->xbuf->tail[0].iov_base += maxcount&3;
2831                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2832                 ADJUST_ARGS();
2833         }
2834         return 0;
2835 }
2836
2837 static __be32
2838 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2839 {
2840         int maxcount;
2841         loff_t offset;
2842         __be32 *page, *savep, *tailbase;
2843         __be32 *p;
2844
2845         if (nfserr)
2846                 return nfserr;
2847         if (resp->xbuf->page_len)
2848                 return nfserr_resource;
2849
2850         RESERVE_SPACE(8);  /* verifier */
2851         savep = p;
2852
2853         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2854         WRITE32(0);
2855         WRITE32(0);
2856         ADJUST_ARGS();
2857         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2858         tailbase = p;
2859
2860         maxcount = PAGE_SIZE;
2861         if (maxcount > readdir->rd_maxcount)
2862                 maxcount = readdir->rd_maxcount;
2863
2864         /*
2865          * Convert from bytes to words, account for the two words already
2866          * written, make sure to leave two words at the end for the next
2867          * pointer and eof field.
2868          */
2869         maxcount = (maxcount >> 2) - 4;
2870         if (maxcount < 0) {
2871                 nfserr =  nfserr_toosmall;
2872                 goto err_no_verf;
2873         }
2874
2875         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2876         readdir->common.err = 0;
2877         readdir->buflen = maxcount;
2878         readdir->buffer = page;
2879         readdir->offset = NULL;
2880
2881         offset = readdir->rd_cookie;
2882         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2883                               &offset,
2884                               &readdir->common, nfsd4_encode_dirent);
2885         if (nfserr == nfs_ok &&
2886             readdir->common.err == nfserr_toosmall &&
2887             readdir->buffer == page)
2888                 nfserr = nfserr_toosmall;
2889         if (nfserr == nfserr_symlink)
2890                 nfserr = nfserr_notdir;
2891         if (nfserr)
2892                 goto err_no_verf;
2893
2894         if (readdir->offset)
2895                 xdr_encode_hyper(readdir->offset, offset);
2896
2897         p = readdir->buffer;
2898         *p++ = 0;       /* no more entries */
2899         *p++ = htonl(readdir->common.err == nfserr_eof);
2900         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2901                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2902
2903         /* Use rest of head for padding and remaining ops: */
2904         resp->xbuf->tail[0].iov_base = tailbase;
2905         resp->xbuf->tail[0].iov_len = 0;
2906         resp->p = resp->xbuf->tail[0].iov_base;
2907         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2908
2909         return 0;
2910 err_no_verf:
2911         p = savep;
2912         ADJUST_ARGS();
2913         return nfserr;
2914 }
2915
2916 static __be32
2917 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2918 {
2919         __be32 *p;
2920
2921         if (!nfserr) {
2922                 RESERVE_SPACE(20);
2923                 write_cinfo(&p, &remove->rm_cinfo);
2924                 ADJUST_ARGS();
2925         }
2926         return nfserr;
2927 }
2928
2929 static __be32
2930 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2931 {
2932         __be32 *p;
2933
2934         if (!nfserr) {
2935                 RESERVE_SPACE(40);
2936                 write_cinfo(&p, &rename->rn_sinfo);
2937                 write_cinfo(&p, &rename->rn_tinfo);
2938                 ADJUST_ARGS();
2939         }
2940         return nfserr;
2941 }
2942
2943 static __be32
2944 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
2945                          __be32 nfserr,struct svc_export *exp)
2946 {
2947         int i = 0;
2948         u32 nflavs;
2949         struct exp_flavor_info *flavs;
2950         struct exp_flavor_info def_flavs[2];
2951         __be32 *p;
2952
2953         if (nfserr)
2954                 goto out;
2955         if (exp->ex_nflavors) {
2956                 flavs = exp->ex_flavors;
2957                 nflavs = exp->ex_nflavors;
2958         } else { /* Handling of some defaults in absence of real secinfo: */
2959                 flavs = def_flavs;
2960                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2961                         nflavs = 2;
2962                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2963                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2964                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2965                         nflavs = 1;
2966                         flavs[0].pseudoflavor
2967                                         = svcauth_gss_flavor(exp->ex_client);
2968                 } else {
2969                         nflavs = 1;
2970                         flavs[0].pseudoflavor
2971                                         = exp->ex_client->flavour->flavour;
2972                 }
2973         }
2974
2975         RESERVE_SPACE(4);
2976         WRITE32(nflavs);
2977         ADJUST_ARGS();
2978         for (i = 0; i < nflavs; i++) {
2979                 u32 flav = flavs[i].pseudoflavor;
2980                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2981
2982                 if (gm) {
2983                         RESERVE_SPACE(4);
2984                         WRITE32(RPC_AUTH_GSS);
2985                         ADJUST_ARGS();
2986                         RESERVE_SPACE(4 + gm->gm_oid.len);
2987                         WRITE32(gm->gm_oid.len);
2988                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2989                         ADJUST_ARGS();
2990                         RESERVE_SPACE(4);
2991                         WRITE32(0); /* qop */
2992                         ADJUST_ARGS();
2993                         RESERVE_SPACE(4);
2994                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2995                         ADJUST_ARGS();
2996                         gss_mech_put(gm);
2997                 } else {
2998                         RESERVE_SPACE(4);
2999                         WRITE32(flav);
3000                         ADJUST_ARGS();
3001                 }
3002         }
3003 out:
3004         if (exp)
3005                 exp_put(exp);
3006         return nfserr;
3007 }
3008
3009 static __be32
3010 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3011                      struct nfsd4_secinfo *secinfo)
3012 {
3013         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3014 }
3015
3016 static __be32
3017 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3018                      struct nfsd4_secinfo_no_name *secinfo)
3019 {
3020         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3021 }
3022
3023 /*
3024  * The SETATTR encode routine is special -- it always encodes a bitmap,
3025  * regardless of the error status.
3026  */
3027 static __be32
3028 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3029 {
3030         __be32 *p;
3031
3032         RESERVE_SPACE(12);
3033         if (nfserr) {
3034                 WRITE32(2);
3035                 WRITE32(0);
3036                 WRITE32(0);
3037         }
3038         else {
3039                 WRITE32(2);
3040                 WRITE32(setattr->sa_bmval[0]);
3041                 WRITE32(setattr->sa_bmval[1]);
3042         }
3043         ADJUST_ARGS();
3044         return nfserr;
3045 }
3046
3047 static __be32
3048 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3049 {
3050         __be32 *p;
3051
3052         if (!nfserr) {
3053                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
3054                 WRITEMEM(&scd->se_clientid, 8);
3055                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
3056                 ADJUST_ARGS();
3057         }
3058         else if (nfserr == nfserr_clid_inuse) {
3059                 RESERVE_SPACE(8);
3060                 WRITE32(0);
3061                 WRITE32(0);
3062                 ADJUST_ARGS();
3063         }
3064         return nfserr;
3065 }
3066
3067 static __be32
3068 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3069 {
3070         __be32 *p;
3071
3072         if (!nfserr) {
3073                 RESERVE_SPACE(16);
3074                 WRITE32(write->wr_bytes_written);
3075                 WRITE32(write->wr_how_written);
3076                 WRITEMEM(write->wr_verifier.data, 8);
3077                 ADJUST_ARGS();
3078         }
3079         return nfserr;
3080 }
3081
3082 static __be32
3083 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3084                          struct nfsd4_exchange_id *exid)
3085 {
3086         __be32 *p;
3087         char *major_id;
3088         char *server_scope;
3089         int major_id_sz;
3090         int server_scope_sz;
3091         uint64_t minor_id = 0;
3092
3093         if (nfserr)
3094                 return nfserr;
3095
3096         major_id = utsname()->nodename;
3097         major_id_sz = strlen(major_id);
3098         server_scope = utsname()->nodename;
3099         server_scope_sz = strlen(server_scope);
3100
3101         RESERVE_SPACE(
3102                 8 /* eir_clientid */ +
3103                 4 /* eir_sequenceid */ +
3104                 4 /* eir_flags */ +
3105                 4 /* spr_how (SP4_NONE) */ +
3106                 8 /* so_minor_id */ +
3107                 4 /* so_major_id.len */ +
3108                 (XDR_QUADLEN(major_id_sz) * 4) +
3109                 4 /* eir_server_scope.len */ +
3110                 (XDR_QUADLEN(server_scope_sz) * 4) +
3111                 4 /* eir_server_impl_id.count (0) */);
3112
3113         WRITEMEM(&exid->clientid, 8);
3114         WRITE32(exid->seqid);
3115         WRITE32(exid->flags);
3116
3117         /* state_protect4_r. Currently only support SP4_NONE */
3118         BUG_ON(exid->spa_how != SP4_NONE);
3119         WRITE32(exid->spa_how);
3120
3121         /* The server_owner struct */
3122         WRITE64(minor_id);      /* Minor id */
3123         /* major id */
3124         WRITE32(major_id_sz);
3125         WRITEMEM(major_id, major_id_sz);
3126
3127         /* Server scope */
3128         WRITE32(server_scope_sz);
3129         WRITEMEM(server_scope, server_scope_sz);
3130
3131         /* Implementation id */
3132         WRITE32(0);     /* zero length nfs_impl_id4 array */
3133         ADJUST_ARGS();
3134         return 0;
3135 }
3136
3137 static __be32
3138 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3139                             struct nfsd4_create_session *sess)
3140 {
3141         __be32 *p;
3142
3143         if (nfserr)
3144                 return nfserr;
3145
3146         RESERVE_SPACE(24);
3147         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3148         WRITE32(sess->seqid);
3149         WRITE32(sess->flags);
3150         ADJUST_ARGS();
3151
3152         RESERVE_SPACE(28);
3153         WRITE32(0); /* headerpadsz */
3154         WRITE32(sess->fore_channel.maxreq_sz);
3155         WRITE32(sess->fore_channel.maxresp_sz);
3156         WRITE32(sess->fore_channel.maxresp_cached);
3157         WRITE32(sess->fore_channel.maxops);
3158         WRITE32(sess->fore_channel.maxreqs);
3159         WRITE32(sess->fore_channel.nr_rdma_attrs);
3160         ADJUST_ARGS();
3161
3162         if (sess->fore_channel.nr_rdma_attrs) {
3163                 RESERVE_SPACE(4);
3164                 WRITE32(sess->fore_channel.rdma_attrs);
3165                 ADJUST_ARGS();
3166         }
3167
3168         RESERVE_SPACE(28);
3169         WRITE32(0); /* headerpadsz */
3170         WRITE32(sess->back_channel.maxreq_sz);
3171         WRITE32(sess->back_channel.maxresp_sz);
3172         WRITE32(sess->back_channel.maxresp_cached);
3173         WRITE32(sess->back_channel.maxops);
3174         WRITE32(sess->back_channel.maxreqs);
3175         WRITE32(sess->back_channel.nr_rdma_attrs);
3176         ADJUST_ARGS();
3177
3178         if (sess->back_channel.nr_rdma_attrs) {
3179                 RESERVE_SPACE(4);
3180                 WRITE32(sess->back_channel.rdma_attrs);
3181                 ADJUST_ARGS();
3182         }
3183         return 0;
3184 }
3185
3186 static __be32
3187 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3188                              struct nfsd4_destroy_session *destroy_session)
3189 {
3190         return nfserr;
3191 }
3192
3193 static __be32
3194 nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, int nfserr,
3195                           struct nfsd4_free_stateid *free_stateid)
3196 {
3197         __be32 *p;
3198
3199         if (nfserr)
3200                 return nfserr;
3201
3202         RESERVE_SPACE(4);
3203         WRITE32(nfserr);
3204         ADJUST_ARGS();
3205         return nfserr;
3206 }
3207
3208 static __be32
3209 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3210                       struct nfsd4_sequence *seq)
3211 {
3212         __be32 *p;
3213
3214         if (nfserr)
3215                 return nfserr;
3216
3217         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3218         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3219         WRITE32(seq->seqid);
3220         WRITE32(seq->slotid);
3221         WRITE32(seq->maxslots);
3222         /* For now: target_maxslots = maxslots */
3223         WRITE32(seq->maxslots);
3224         WRITE32(seq->status_flags);
3225
3226         ADJUST_ARGS();
3227         resp->cstate.datap = p; /* DRC cache data pointer */
3228         return 0;
3229 }
3230
3231 __be32
3232 nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, int nfserr,
3233                           struct nfsd4_test_stateid *test_stateid)
3234 {
3235         struct nfsd4_compoundargs *argp;
3236         stateid_t si;
3237         __be32 *p;
3238         int i;
3239         int valid;
3240
3241         restore_buf(test_stateid->ts_saved_args, &test_stateid->ts_savedp);
3242         argp = test_stateid->ts_saved_args;
3243
3244         RESERVE_SPACE(4);
3245         *p++ = htonl(test_stateid->ts_num_ids);
3246         resp->p = p;
3247
3248         nfs4_lock_state();
3249         for (i = 0; i < test_stateid->ts_num_ids; i++) {
3250                 nfsd4_decode_stateid(argp, &si);
3251                 valid = nfs4_validate_stateid(&si, test_stateid->ts_has_session);
3252                 RESERVE_SPACE(4);
3253                 *p++ = htonl(valid);
3254                 resp->p = p;
3255         }
3256         nfs4_unlock_state();
3257
3258         return nfserr;
3259 }
3260
3261 static __be32
3262 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3263 {
3264         return nfserr;
3265 }
3266
3267 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3268
3269 /*
3270  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3271  * since we don't need to filter out obsolete ops as this is
3272  * done in the decoding phase.
3273  */
3274 static nfsd4_enc nfsd4_enc_ops[] = {
3275         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3276         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3277         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3278         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3279         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3280         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3281         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3282         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3283         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3284         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3285         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3286         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3287         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3288         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3289         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3290         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3291         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3292         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3293         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3294         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3295         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3296         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3297         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3298         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3299         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3300         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3301         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3302         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3303         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3304         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3305         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3306         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3307         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3308         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3309         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3310         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3311         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3312
3313         /* NFSv4.1 operations */
3314         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3315         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3316         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3317         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3318         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3319         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3320         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3321         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3322         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3323         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3324         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3325         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3326         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3327         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3328         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3329         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3330         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3331         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3332         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3333 };
3334
3335 /*
3336  * Calculate the total amount of memory that the compound response has taken
3337  * after encoding the current operation.
3338  *
3339  * pad: add on 8 bytes for the next operation's op_code and status so that
3340  * there is room to cache a failure on the next operation.
3341  *
3342  * Compare this length to the session se_fmaxresp_cached.
3343  *
3344  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3345  * will be at least a page and will therefore hold the xdr_buf head.
3346  */
3347 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3348 {
3349         int status = 0;
3350         struct xdr_buf *xb = &resp->rqstp->rq_res;
3351         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3352         struct nfsd4_session *session = NULL;
3353         struct nfsd4_slot *slot = resp->cstate.slot;
3354         u32 length, tlen = 0, pad = 8;
3355
3356         if (!nfsd4_has_session(&resp->cstate))
3357                 return status;
3358
3359         session = resp->cstate.session;
3360         if (session == NULL || slot->sl_cachethis == 0)
3361                 return status;
3362
3363         if (resp->opcnt >= args->opcnt)
3364                 pad = 0; /* this is the last operation */
3365
3366         if (xb->page_len == 0) {
3367                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3368         } else {
3369                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3370                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3371
3372                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3373         }
3374         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3375                 length, xb->page_len, tlen, pad);
3376
3377         if (length <= session->se_fchannel.maxresp_cached)
3378                 return status;
3379         else
3380                 return nfserr_rep_too_big_to_cache;
3381 }
3382
3383 void
3384 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3385 {
3386         __be32 *statp;
3387         __be32 *p;
3388
3389         RESERVE_SPACE(8);
3390         WRITE32(op->opnum);
3391         statp = p++;    /* to be backfilled at the end */
3392         ADJUST_ARGS();
3393
3394         if (op->opnum == OP_ILLEGAL)
3395                 goto status;
3396         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3397                !nfsd4_enc_ops[op->opnum]);
3398         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3399         /* nfsd4_check_drc_limit guarantees enough room for error status */
3400         if (!op->status && nfsd4_check_drc_limit(resp))
3401                 op->status = nfserr_rep_too_big_to_cache;
3402 status:
3403         /*
3404          * Note: We write the status directly, instead of using WRITE32(),
3405          * since it is already in network byte order.
3406          */
3407         *statp = op->status;
3408 }
3409
3410 /*
3411  * Encode the reply stored in the stateowner reply cache
3412  *
3413  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3414  * previously sent already encoded operation.
3415  *
3416  * called with nfs4_lock_state() held
3417  */
3418 void
3419 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3420 {
3421         __be32 *p;
3422         struct nfs4_replay *rp = op->replay;
3423
3424         BUG_ON(!rp);
3425
3426         RESERVE_SPACE(8);
3427         WRITE32(op->opnum);
3428         *p++ = rp->rp_status;  /* already xdr'ed */
3429         ADJUST_ARGS();
3430
3431         RESERVE_SPACE(rp->rp_buflen);
3432         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3433         ADJUST_ARGS();
3434 }
3435
3436 int
3437 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3438 {
3439         return xdr_ressize_check(rqstp, p);
3440 }
3441
3442 int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3443 {
3444         struct svc_rqst *rqstp = rq;
3445         struct nfsd4_compoundargs *args = rqstp->rq_argp;
3446
3447         if (args->ops != args->iops) {
3448                 kfree(args->ops);
3449                 args->ops = args->iops;
3450         }
3451         kfree(args->tmpp);
3452         args->tmpp = NULL;
3453         while (args->to_free) {
3454                 struct tmpbuf *tb = args->to_free;
3455                 args->to_free = tb->next;
3456                 tb->release(tb->buf);
3457                 kfree(tb);
3458         }
3459         return 1;
3460 }
3461
3462 int
3463 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3464 {
3465         args->p = p;
3466         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3467         args->pagelist = rqstp->rq_arg.pages;
3468         args->pagelen = rqstp->rq_arg.page_len;
3469         args->tmpp = NULL;
3470         args->to_free = NULL;
3471         args->ops = args->iops;
3472         args->rqstp = rqstp;
3473
3474         return !nfsd4_decode_compound(args);
3475 }
3476
3477 int
3478 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3479 {
3480         /*
3481          * All that remains is to write the tag and operation count...
3482          */
3483         struct nfsd4_compound_state *cs = &resp->cstate;
3484         struct kvec *iov;
3485         p = resp->tagp;
3486         *p++ = htonl(resp->taglen);
3487         memcpy(p, resp->tag, resp->taglen);
3488         p += XDR_QUADLEN(resp->taglen);
3489         *p++ = htonl(resp->opcnt);
3490
3491         if (rqstp->rq_res.page_len)
3492                 iov = &rqstp->rq_res.tail[0];
3493         else
3494                 iov = &rqstp->rq_res.head[0];
3495         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3496         BUG_ON(iov->iov_len > PAGE_SIZE);
3497         if (nfsd4_has_session(cs)) {
3498                 if (cs->status != nfserr_replay_cache) {
3499                         nfsd4_store_cache_entry(resp);
3500                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3501                         cs->slot->sl_inuse = false;
3502                 }
3503                 /* Renew the clientid on success and on replay */
3504                 release_session_client(cs->session);
3505                 nfsd4_put_session(cs->session);
3506         }
3507         return 1;
3508 }
3509
3510 /*
3511  * Local variables:
3512  *  c-basic-offset: 8
3513  * End:
3514  */