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   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/param.h>
  44 #include <linux/smp.h>
  45 #include <linux/fs.h>
  46 #include <linux/namei.h>
  47 #include <linux/vfs.h>
  48 #include <linux/utsname.h>
  49 #include <linux/sunrpc/xdr.h>
  50 #include <linux/sunrpc/svc.h>
  51 #include <linux/sunrpc/clnt.h>
  52 #include <linux/nfsd/nfsd.h>
  53 #include <linux/nfsd/state.h>
  54 #include <linux/nfsd/xdr4.h>
  55 #include <linux/nfsd_idmap.h>
  56 #include <linux/nfs4.h>
  57 #include <linux/nfs4_acl.h>
  58 #include <linux/sunrpc/gss_api.h>
  59 #include <linux/sunrpc/svcauth_gss.h>
  60 #include "vfs.h"
  61
  62 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  63
  64 /*
  65  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  66  * directory in order to indicate to the client that a filesystem boundary is present
  67  * We use a fixed fsid for a referral
  68  */
  69 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  70 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  71
  72 static __be32
  73 check_filename(char *str, int len, __be32 err)
  74 {
  75         int i;
  76
  77         if (len == 0)
  78                 return nfserr_inval;
  79         if (isdotent(str, len))
  80                 return err;
  81         for (i = 0; i < len; i++)
  82                 if (str[i] == '/')
  83                         return err;
  84         return 0;
  85 }
  86
  87 #define DECODE_HEAD                             \
  88         __be32 *p;                              \
  89         __be32 status
  90 #define DECODE_TAIL                             \
  91         status = 0;                             \
  92 out:                                            \
  93         return status;                          \
  94 xdr_error:                                      \
  95         dprintk("NFSD: xdr error (%s:%d)\n",    \
  96                         __FILE__, __LINE__);    \
  97         status = nfserr_bad_xdr;                \
  98         goto out
  99
 100 #define READ32(x)         (x) = ntohl(*p++)
 101 #define READ64(x)         do {                  \
 102         (x) = (u64)ntohl(*p++) << 32;           \
 103         (x) |= ntohl(*p++);                     \
 104 } while (0)
 105 #define READTIME(x)       do {                  \
 106         p++;                                    \
 107         (x) = ntohl(*p++);                      \
 108         p++;                                    \
 109 } while (0)
 110 #define READMEM(x,nbytes) do {                  \
 111         x = (char *)p;                          \
 112         p += XDR_QUADLEN(nbytes);               \
 113 } while (0)
 114 #define SAVEMEM(x,nbytes) do {                  \
 115         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 116                 savemem(argp, p, nbytes) :      \
 117                 (char *)p)) {                   \
 118                 dprintk("NFSD: xdr error (%s:%d)\n", \
 119                                 __FILE__, __LINE__); \
 120                 goto xdr_error;                 \
 121                 }                               \
 122         p += XDR_QUADLEN(nbytes);               \
 123 } while (0)
 124 #define COPYMEM(x,nbytes) do {                  \
 125         memcpy((x), p, nbytes);                 \
 126         p += XDR_QUADLEN(nbytes);               \
 127 } while (0)
 128
 129 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 130 #define READ_BUF(nbytes)  do {                  \
 131         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 132                 p = argp->p;                    \
 133                 argp->p += XDR_QUADLEN(nbytes); \
 134         } else if (!(p = read_buf(argp, nbytes))) { \
 135                 dprintk("NFSD: xdr error (%s:%d)\n", \
 136                                 __FILE__, __LINE__); \
 137                 goto xdr_error;                 \
 138         }                                       \
 139 } while (0)
 140
 141 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 142 {
 143         /* We want more bytes than seem to be available.
 144          * Maybe we need a new page, maybe we have just run out
 145          */
 146         unsigned int avail = (char *)argp->end - (char *)argp->p;
 147         __be32 *p;
 148         if (avail + argp->pagelen < nbytes)
 149                 return NULL;
 150         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 151                 return NULL;
 152         /* ok, we can do it with the current plus the next page */
 153         if (nbytes <= sizeof(argp->tmp))
 154                 p = argp->tmp;
 155         else {
 156                 kfree(argp->tmpp);
 157                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 158                 if (!p)
 159                         return NULL;
 160
 161         }
 162         /*
 163          * The following memcpy is safe because read_buf is always
 164          * called with nbytes > avail, and the two cases above both
 165          * guarantee p points to at least nbytes bytes.
 166          */
 167         memcpy(p, argp->p, avail);
 168         /* step to next page */
 169         argp->p = page_address(argp->pagelist[0]);
 170         argp->pagelist++;
 171         if (argp->pagelen < PAGE_SIZE) {
 172                 argp->end = p + (argp->pagelen>>2);
 173                 argp->pagelen = 0;
 174         } else {
 175                 argp->end = p + (PAGE_SIZE>>2);
 176                 argp->pagelen -= PAGE_SIZE;
 177         }
 178         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 179         argp->p += XDR_QUADLEN(nbytes - avail);
 180         return p;
 181 }
 182
 183 static int zero_clientid(clientid_t *clid)
 184 {
 185         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 186 }
 187
 188 static int
 189 defer_free(struct nfsd4_compoundargs *argp,
 190                 void (*release)(const void *), void *p)
 191 {
 192         struct tmpbuf *tb;
 193
 194         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 195         if (!tb)
 196                 return -ENOMEM;
 197         tb->buf = p;
 198         tb->release = release;
 199         tb->next = argp->to_free;
 200         argp->to_free = tb;
 201         return 0;
 202 }
 203
 204 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 205 {
 206         if (p == argp->tmp) {
 207                 p = kmalloc(nbytes, GFP_KERNEL);
 208                 if (!p)
 209                         return NULL;
 210                 memcpy(p, argp->tmp, nbytes);
 211         } else {
 212                 BUG_ON(p != argp->tmpp);
 213                 argp->tmpp = NULL;
 214         }
 215         if (defer_free(argp, kfree, p)) {
 216                 kfree(p);
 217                 return NULL;
 218         } else
 219                 return (char *)p;
 220 }
 221
 222 static __be32
 223 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 224 {
 225         u32 bmlen;
 226         DECODE_HEAD;
 227
 228         bmval[0] = 0;
 229         bmval[1] = 0;
 230         bmval[2] = 0;
 231
 232         READ_BUF(4);
 233         READ32(bmlen);
 234         if (bmlen > 1000)
 235                 goto xdr_error;
 236
 237         READ_BUF(bmlen << 2);
 238         if (bmlen > 0)
 239                 READ32(bmval[0]);
 240         if (bmlen > 1)
 241                 READ32(bmval[1]);
 242         if (bmlen > 2)
 243                 READ32(bmval[2]);
 244
 245         DECODE_TAIL;
 246 }
 247
 248 static __be32
 249 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 250                    struct iattr *iattr, struct nfs4_acl **acl)
 251 {
 252         int expected_len, len = 0;
 253         u32 dummy32;
 254         char *buf;
 255         int host_err;
 256
 257         DECODE_HEAD;
 258         iattr->ia_valid = 0;
 259         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 260                 return status;
 261
 262         READ_BUF(4);
 263         READ32(expected_len);
 264
 265         if (bmval[0] & FATTR4_WORD0_SIZE) {
 266                 READ_BUF(8);
 267                 len += 8;
 268                 READ64(iattr->ia_size);
 269                 iattr->ia_valid |= ATTR_SIZE;
 270         }
 271         if (bmval[0] & FATTR4_WORD0_ACL) {
 272                 int nace;
 273                 struct nfs4_ace *ace;
 274
 275                 READ_BUF(4); len += 4;
 276                 READ32(nace);
 277
 278                 if (nace > NFS4_ACL_MAX)
 279                         return nfserr_resource;
 280
 281                 *acl = nfs4_acl_new(nace);
 282                 if (*acl == NULL) {
 283                         host_err = -ENOMEM;
 284                         goto out_nfserr;
 285                 }
 286                 defer_free(argp, kfree, *acl);
 287
 288                 (*acl)->naces = nace;
 289                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 290                         READ_BUF(16); len += 16;
 291                         READ32(ace->type);
 292                         READ32(ace->flag);
 293                         READ32(ace->access_mask);
 294                         READ32(dummy32);
 295                         READ_BUF(dummy32);
 296                         len += XDR_QUADLEN(dummy32) << 2;
 297                         READMEM(buf, dummy32);
 298                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 299                         host_err = 0;
 300                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 301                                 ace->who = 0;
 302                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 303                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 304                                                 buf, dummy32, &ace->who);
 305                         else
 306                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 307                                                 buf, dummy32, &ace->who);
 308                         if (host_err)
 309                                 goto out_nfserr;
 310                 }
 311         } else
 312                 *acl = NULL;
 313         if (bmval[1] & FATTR4_WORD1_MODE) {
 314                 READ_BUF(4);
 315                 len += 4;
 316                 READ32(iattr->ia_mode);
 317                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 318                 iattr->ia_valid |= ATTR_MODE;
 319         }
 320         if (bmval[1] & FATTR4_WORD1_OWNER) {
 321                 READ_BUF(4);
 322                 len += 4;
 323                 READ32(dummy32);
 324                 READ_BUF(dummy32);
 325                 len += (XDR_QUADLEN(dummy32) << 2);
 326                 READMEM(buf, dummy32);
 327                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 328                         goto out_nfserr;
 329                 iattr->ia_valid |= ATTR_UID;
 330         }
 331         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 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 ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 339                         goto out_nfserr;
 340                 iattr->ia_valid |= ATTR_GID;
 341         }
 342         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 343                 READ_BUF(4);
 344                 len += 4;
 345                 READ32(dummy32);
 346                 switch (dummy32) {
 347                 case NFS4_SET_TO_CLIENT_TIME:
 348                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 349                            all 32 bits of 'nseconds'. */
 350                         READ_BUF(12);
 351                         len += 12;
 352                         READ32(dummy32);
 353                         if (dummy32)
 354                                 return nfserr_inval;
 355                         READ32(iattr->ia_atime.tv_sec);
 356                         READ32(iattr->ia_atime.tv_nsec);
 357                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 358                                 return nfserr_inval;
 359                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 360                         break;
 361                 case NFS4_SET_TO_SERVER_TIME:
 362                         iattr->ia_valid |= ATTR_ATIME;
 363                         break;
 364                 default:
 365                         goto xdr_error;
 366                 }
 367         }
 368         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 369                 READ_BUF(4);
 370                 len += 4;
 371                 READ32(dummy32);
 372                 switch (dummy32) {
 373                 case NFS4_SET_TO_CLIENT_TIME:
 374                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 375                            all 32 bits of 'nseconds'. */
 376                         READ_BUF(12);
 377                         len += 12;
 378                         READ32(dummy32);
 379                         if (dummy32)
 380                                 return nfserr_inval;
 381                         READ32(iattr->ia_mtime.tv_sec);
 382                         READ32(iattr->ia_mtime.tv_nsec);
 383                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 384                                 return nfserr_inval;
 385                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 386                         break;
 387                 case NFS4_SET_TO_SERVER_TIME:
 388                         iattr->ia_valid |= ATTR_MTIME;
 389                         break;
 390                 default:
 391                         goto xdr_error;
 392                 }
 393         }
 394         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 395             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 396             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 397                 READ_BUF(expected_len - len);
 398         else if (len != expected_len)
 399                 goto xdr_error;
 400
 401         DECODE_TAIL;
 402
 403 out_nfserr:
 404         status = nfserrno(host_err);
 405         goto out;
 406 }
 407
 408 static __be32
 409 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 410 {
 411         DECODE_HEAD;
 412
 413         READ_BUF(sizeof(stateid_t));
 414         READ32(sid->si_generation);
 415         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 416
 417         DECODE_TAIL;
 418 }
 419
 420 static __be32
 421 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 422 {
 423         DECODE_HEAD;
 424
 425         READ_BUF(4);
 426         READ32(access->ac_req_access);
 427
 428         DECODE_TAIL;
 429 }
 430
 431 static __be32
 432 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 433 {
 434         DECODE_HEAD;
 435
 436         close->cl_stateowner = NULL;
 437         READ_BUF(4);
 438         READ32(close->cl_seqid);
 439         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 440
 441         DECODE_TAIL;
 442 }
 443
 444
 445 static __be32
 446 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 447 {
 448         DECODE_HEAD;
 449
 450         READ_BUF(12);
 451         READ64(commit->co_offset);
 452         READ32(commit->co_count);
 453
 454         DECODE_TAIL;
 455 }
 456
 457 static __be32
 458 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 459 {
 460         DECODE_HEAD;
 461
 462         READ_BUF(4);
 463         READ32(create->cr_type);
 464         switch (create->cr_type) {
 465         case NF4LNK:
 466                 READ_BUF(4);
 467                 READ32(create->cr_linklen);
 468                 READ_BUF(create->cr_linklen);
 469                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 470                 break;
 471         case NF4BLK:
 472         case NF4CHR:
 473                 READ_BUF(8);
 474                 READ32(create->cr_specdata1);
 475                 READ32(create->cr_specdata2);
 476                 break;
 477         case NF4SOCK:
 478         case NF4FIFO:
 479         case NF4DIR:
 480         default:
 481                 break;
 482         }
 483
 484         READ_BUF(4);
 485         READ32(create->cr_namelen);
 486         READ_BUF(create->cr_namelen);
 487         SAVEMEM(create->cr_name, create->cr_namelen);
 488         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 489                 return status;
 490
 491         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 492                                     &create->cr_acl);
 493         if (status)
 494                 goto out;
 495
 496         DECODE_TAIL;
 497 }
 498
 499 static inline __be32
 500 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 501 {
 502         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 503 }
 504
 505 static inline __be32
 506 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 507 {
 508         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 509 }
 510
 511 static __be32
 512 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 513 {
 514         DECODE_HEAD;
 515
 516         READ_BUF(4);
 517         READ32(link->li_namelen);
 518         READ_BUF(link->li_namelen);
 519         SAVEMEM(link->li_name, link->li_namelen);
 520         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 521                 return status;
 522
 523         DECODE_TAIL;
 524 }
 525
 526 static __be32
 527 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 528 {
 529         DECODE_HEAD;
 530
 531         lock->lk_replay_owner = NULL;
 532         /*
 533         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 534         */
 535         READ_BUF(28);
 536         READ32(lock->lk_type);
 537         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 538                 goto xdr_error;
 539         READ32(lock->lk_reclaim);
 540         READ64(lock->lk_offset);
 541         READ64(lock->lk_length);
 542         READ32(lock->lk_is_new);
 543
 544         if (lock->lk_is_new) {
 545                 READ_BUF(4);
 546                 READ32(lock->lk_new_open_seqid);
 547                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 548                 if (status)
 549                         return status;
 550                 READ_BUF(8 + sizeof(clientid_t));
 551                 READ32(lock->lk_new_lock_seqid);
 552                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 553                 READ32(lock->lk_new_owner.len);
 554                 READ_BUF(lock->lk_new_owner.len);
 555                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 556         } else {
 557                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 558                 if (status)
 559                         return status;
 560                 READ_BUF(4);
 561                 READ32(lock->lk_old_lock_seqid);
 562         }
 563
 564         DECODE_TAIL;
 565 }
 566
 567 static __be32
 568 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 569 {
 570         DECODE_HEAD;
 571
 572         READ_BUF(32);
 573         READ32(lockt->lt_type);
 574         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 575                 goto xdr_error;
 576         READ64(lockt->lt_offset);
 577         READ64(lockt->lt_length);
 578         COPYMEM(&lockt->lt_clientid, 8);
 579         READ32(lockt->lt_owner.len);
 580         READ_BUF(lockt->lt_owner.len);
 581         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 582
 583         if (argp->minorversion && !zero_clientid(&lockt->lt_clientid))
 584                 return nfserr_inval;
 585         DECODE_TAIL;
 586 }
 587
 588 static __be32
 589 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 590 {
 591         DECODE_HEAD;
 592
 593         locku->lu_stateowner = NULL;
 594         READ_BUF(8);
 595         READ32(locku->lu_type);
 596         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 597                 goto xdr_error;
 598         READ32(locku->lu_seqid);
 599         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 600         if (status)
 601                 return status;
 602         READ_BUF(16);
 603         READ64(locku->lu_offset);
 604         READ64(locku->lu_length);
 605
 606         DECODE_TAIL;
 607 }
 608
 609 static __be32
 610 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 611 {
 612         DECODE_HEAD;
 613
 614         READ_BUF(4);
 615         READ32(lookup->lo_len);
 616         READ_BUF(lookup->lo_len);
 617         SAVEMEM(lookup->lo_name, lookup->lo_len);
 618         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 619                 return status;
 620
 621         DECODE_TAIL;
 622 }
 623
 624 static __be32
 625 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 626 {
 627         DECODE_HEAD;
 628
 629         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 630         open->op_iattr.ia_valid = 0;
 631         open->op_stateowner = NULL;
 632
 633         /* seqid, share_access, share_deny, clientid, ownerlen */
 634         READ_BUF(16 + sizeof(clientid_t));
 635         READ32(open->op_seqid);
 636         READ32(open->op_share_access);
 637         READ32(open->op_share_deny);
 638         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 639         READ32(open->op_owner.len);
 640
 641         /* owner, open_flag */
 642         READ_BUF(open->op_owner.len + 4);
 643         SAVEMEM(open->op_owner.data, open->op_owner.len);
 644         READ32(open->op_create);
 645         switch (open->op_create) {
 646         case NFS4_OPEN_NOCREATE:
 647                 break;
 648         case NFS4_OPEN_CREATE:
 649                 READ_BUF(4);
 650                 READ32(open->op_createmode);
 651                 switch (open->op_createmode) {
 652                 case NFS4_CREATE_UNCHECKED:
 653                 case NFS4_CREATE_GUARDED:
 654                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 655                                 &open->op_iattr, &open->op_acl);
 656                         if (status)
 657                                 goto out;
 658                         break;
 659                 case NFS4_CREATE_EXCLUSIVE:
 660                         READ_BUF(8);
 661                         COPYMEM(open->op_verf.data, 8);
 662                         break;
 663                 case NFS4_CREATE_EXCLUSIVE4_1:
 664                         if (argp->minorversion < 1)
 665                                 goto xdr_error;
 666                         READ_BUF(8);
 667                         COPYMEM(open->op_verf.data, 8);
 668                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 669                                 &open->op_iattr, &open->op_acl);
 670                         if (status)
 671                                 goto out;
 672                         break;
 673                 default:
 674                         goto xdr_error;
 675                 }
 676                 break;
 677         default:
 678                 goto xdr_error;
 679         }
 680
 681         /* open_claim */
 682         READ_BUF(4);
 683         READ32(open->op_claim_type);
 684         switch (open->op_claim_type) {
 685         case NFS4_OPEN_CLAIM_NULL:
 686         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 687                 READ_BUF(4);
 688                 READ32(open->op_fname.len);
 689                 READ_BUF(open->op_fname.len);
 690                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 691                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 692                         return status;
 693                 break;
 694         case NFS4_OPEN_CLAIM_PREVIOUS:
 695                 READ_BUF(4);
 696                 READ32(open->op_delegate_type);
 697                 break;
 698         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 699                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 700                 if (status)
 701                         return status;
 702                 READ_BUF(4);
 703                 READ32(open->op_fname.len);
 704                 READ_BUF(open->op_fname.len);
 705                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 706                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 707                         return status;
 708                 break;
 709         default:
 710                 goto xdr_error;
 711         }
 712
 713         DECODE_TAIL;
 714 }
 715
 716 static __be32
 717 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 718 {
 719         DECODE_HEAD;
 720
 721         open_conf->oc_stateowner = NULL;
 722         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 723         if (status)
 724                 return status;
 725         READ_BUF(4);
 726         READ32(open_conf->oc_seqid);
 727
 728         DECODE_TAIL;
 729 }
 730
 731 static __be32
 732 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 733 {
 734         DECODE_HEAD;
 735
 736         open_down->od_stateowner = NULL;
 737         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 738         if (status)
 739                 return status;
 740         READ_BUF(12);
 741         READ32(open_down->od_seqid);
 742         READ32(open_down->od_share_access);
 743         READ32(open_down->od_share_deny);
 744
 745         DECODE_TAIL;
 746 }
 747
 748 static __be32
 749 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 750 {
 751         DECODE_HEAD;
 752
 753         READ_BUF(4);
 754         READ32(putfh->pf_fhlen);
 755         if (putfh->pf_fhlen > NFS4_FHSIZE)
 756                 goto xdr_error;
 757         READ_BUF(putfh->pf_fhlen);
 758         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 759
 760         DECODE_TAIL;
 761 }
 762
 763 static __be32
 764 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 765 {
 766         DECODE_HEAD;
 767
 768         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 769         if (status)
 770                 return status;
 771         READ_BUF(12);
 772         READ64(read->rd_offset);
 773         READ32(read->rd_length);
 774
 775         DECODE_TAIL;
 776 }
 777
 778 static __be32
 779 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 780 {
 781         DECODE_HEAD;
 782
 783         READ_BUF(24);
 784         READ64(readdir->rd_cookie);
 785         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 786         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 787         READ32(readdir->rd_maxcount);
 788         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 789                 goto out;
 790
 791         DECODE_TAIL;
 792 }
 793
 794 static __be32
 795 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 796 {
 797         DECODE_HEAD;
 798
 799         READ_BUF(4);
 800         READ32(remove->rm_namelen);
 801         READ_BUF(remove->rm_namelen);
 802         SAVEMEM(remove->rm_name, remove->rm_namelen);
 803         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 804                 return status;
 805
 806         DECODE_TAIL;
 807 }
 808
 809 static __be32
 810 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 811 {
 812         DECODE_HEAD;
 813
 814         READ_BUF(4);
 815         READ32(rename->rn_snamelen);
 816         READ_BUF(rename->rn_snamelen + 4);
 817         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 818         READ32(rename->rn_tnamelen);
 819         READ_BUF(rename->rn_tnamelen);
 820         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 821         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 822                 return status;
 823         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 824                 return status;
 825
 826         DECODE_TAIL;
 827 }
 828
 829 static __be32
 830 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 831 {
 832         DECODE_HEAD;
 833
 834         READ_BUF(sizeof(clientid_t));
 835         COPYMEM(clientid, sizeof(clientid_t));
 836
 837         DECODE_TAIL;
 838 }
 839
 840 static __be32
 841 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 842                      struct nfsd4_secinfo *secinfo)
 843 {
 844         DECODE_HEAD;
 845
 846         READ_BUF(4);
 847         READ32(secinfo->si_namelen);
 848         READ_BUF(secinfo->si_namelen);
 849         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 850         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 851                                                                 nfserr_noent);
 852         if (status)
 853                 return status;
 854         DECODE_TAIL;
 855 }
 856
 857 static __be32
 858 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 859 {
 860         __be32 status;
 861
 862         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 863         if (status)
 864                 return status;
 865         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 866                                   &setattr->sa_acl);
 867 }
 868
 869 static __be32
 870 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 871 {
 872         DECODE_HEAD;
 873
 874         READ_BUF(12);
 875         COPYMEM(setclientid->se_verf.data, 8);
 876         READ32(setclientid->se_namelen);
 877
 878         READ_BUF(setclientid->se_namelen + 8);
 879         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 880         READ32(setclientid->se_callback_prog);
 881         READ32(setclientid->se_callback_netid_len);
 882
 883         READ_BUF(setclientid->se_callback_netid_len + 4);
 884         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 885         READ32(setclientid->se_callback_addr_len);
 886
 887         READ_BUF(setclientid->se_callback_addr_len + 4);
 888         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 889         READ32(setclientid->se_callback_ident);
 890
 891         DECODE_TAIL;
 892 }
 893
 894 static __be32
 895 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 896 {
 897         DECODE_HEAD;
 898
 899         READ_BUF(8 + sizeof(nfs4_verifier));
 900         COPYMEM(&scd_c->sc_clientid, 8);
 901         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 902
 903         DECODE_TAIL;
 904 }
 905
 906 /* Also used for NVERIFY */
 907 static __be32
 908 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 909 {
 910 #if 0
 911         struct nfsd4_compoundargs save = {
 912                 .p = argp->p,
 913                 .end = argp->end,
 914                 .rqstp = argp->rqstp,
 915         };
 916         u32             ve_bmval[2];
 917         struct iattr    ve_iattr;           /* request */
 918         struct nfs4_acl *ve_acl;            /* request */
 919 #endif
 920         DECODE_HEAD;
 921
 922         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 923                 goto out;
 924
 925         /* For convenience's sake, we compare raw xdr'd attributes in
 926          * nfsd4_proc_verify; however we still decode here just to return
 927          * correct error in case of bad xdr. */
 928 #if 0
 929         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 930         if (status == nfserr_inval) {
 931                 status = nfserrno(status);
 932                 goto out;
 933         }
 934 #endif
 935         READ_BUF(4);
 936         READ32(verify->ve_attrlen);
 937         READ_BUF(verify->ve_attrlen);
 938         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 939
 940         DECODE_TAIL;
 941 }
 942
 943 static __be32
 944 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 945 {
 946         int avail;
 947         int v;
 948         int len;
 949         DECODE_HEAD;
 950
 951         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 952         if (status)
 953                 return status;
 954         READ_BUF(16);
 955         READ64(write->wr_offset);
 956         READ32(write->wr_stable_how);
 957         if (write->wr_stable_how > 2)
 958                 goto xdr_error;
 959         READ32(write->wr_buflen);
 960
 961         /* Sorry .. no magic macros for this.. *
 962          * READ_BUF(write->wr_buflen);
 963          * SAVEMEM(write->wr_buf, write->wr_buflen);
 964          */
 965         avail = (char*)argp->end - (char*)argp->p;
 966         if (avail + argp->pagelen < write->wr_buflen) {
 967                 dprintk("NFSD: xdr error (%s:%d)\n",
 968                                 __FILE__, __LINE__);
 969                 goto xdr_error;
 970         }
 971         argp->rqstp->rq_vec[0].iov_base = p;
 972         argp->rqstp->rq_vec[0].iov_len = avail;
 973         v = 0;
 974         len = write->wr_buflen;
 975         while (len > argp->rqstp->rq_vec[v].iov_len) {
 976                 len -= argp->rqstp->rq_vec[v].iov_len;
 977                 v++;
 978                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 979                 argp->pagelist++;
 980                 if (argp->pagelen >= PAGE_SIZE) {
 981                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 982                         argp->pagelen -= PAGE_SIZE;
 983                 } else {
 984                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 985                         argp->pagelen -= len;
 986                 }
 987         }
 988         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 989         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 990         argp->rqstp->rq_vec[v].iov_len = len;
 991         write->wr_vlen = v+1;
 992
 993         DECODE_TAIL;
 994 }
 995
 996 static __be32
 997 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 998 {
 999         DECODE_HEAD;
1000
1001         READ_BUF(12);
1002         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1003         READ32(rlockowner->rl_owner.len);
1004         READ_BUF(rlockowner->rl_owner.len);
1005         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1006
1007         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1008                 return nfserr_inval;
1009         DECODE_TAIL;
1010 }
1011
1012 static __be32
1013 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1014                          struct nfsd4_exchange_id *exid)
1015 {
1016         int dummy;
1017         DECODE_HEAD;
1018
1019         READ_BUF(NFS4_VERIFIER_SIZE);
1020         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1021
1022         READ_BUF(4);
1023         READ32(exid->clname.len);
1024
1025         READ_BUF(exid->clname.len);
1026         SAVEMEM(exid->clname.data, exid->clname.len);
1027
1028         READ_BUF(4);
1029         READ32(exid->flags);
1030
1031         /* Ignore state_protect4_a */
1032         READ_BUF(4);
1033         READ32(exid->spa_how);
1034         switch (exid->spa_how) {
1035         case SP4_NONE:
1036                 break;
1037         case SP4_MACH_CRED:
1038                 /* spo_must_enforce */
1039                 READ_BUF(4);
1040                 READ32(dummy);
1041                 READ_BUF(dummy * 4);
1042                 p += dummy;
1043
1044                 /* spo_must_allow */
1045                 READ_BUF(4);
1046                 READ32(dummy);
1047                 READ_BUF(dummy * 4);
1048                 p += dummy;
1049                 break;
1050         case SP4_SSV:
1051                 /* ssp_ops */
1052                 READ_BUF(4);
1053                 READ32(dummy);
1054                 READ_BUF(dummy * 4);
1055                 p += dummy;
1056
1057                 READ_BUF(4);
1058                 READ32(dummy);
1059                 READ_BUF(dummy * 4);
1060                 p += dummy;
1061
1062                 /* ssp_hash_algs<> */
1063                 READ_BUF(4);
1064                 READ32(dummy);
1065                 READ_BUF(dummy);
1066                 p += XDR_QUADLEN(dummy);
1067
1068                 /* ssp_encr_algs<> */
1069                 READ_BUF(4);
1070                 READ32(dummy);
1071                 READ_BUF(dummy);
1072                 p += XDR_QUADLEN(dummy);
1073
1074                 /* ssp_window and ssp_num_gss_handles */
1075                 READ_BUF(8);
1076                 READ32(dummy);
1077                 READ32(dummy);
1078                 break;
1079         default:
1080                 goto xdr_error;
1081         }
1082
1083         /* Ignore Implementation ID */
1084         READ_BUF(4);    /* nfs_impl_id4 array length */
1085         READ32(dummy);
1086
1087         if (dummy > 1)
1088                 goto xdr_error;
1089
1090         if (dummy == 1) {
1091                 /* nii_domain */
1092                 READ_BUF(4);
1093                 READ32(dummy);
1094                 READ_BUF(dummy);
1095                 p += XDR_QUADLEN(dummy);
1096
1097                 /* nii_name */
1098                 READ_BUF(4);
1099                 READ32(dummy);
1100                 READ_BUF(dummy);
1101                 p += XDR_QUADLEN(dummy);
1102
1103                 /* nii_date */
1104                 READ_BUF(12);
1105                 p += 3;
1106         }
1107         DECODE_TAIL;
1108 }
1109
1110 static __be32
1111 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1112                             struct nfsd4_create_session *sess)
1113 {
1114         DECODE_HEAD;
1115
1116         u32 dummy;
1117         char *machine_name;
1118         int i;
1119         int nr_secflavs;
1120
1121         READ_BUF(16);
1122         COPYMEM(&sess->clientid, 8);
1123         READ32(sess->seqid);
1124         READ32(sess->flags);
1125
1126         /* Fore channel attrs */
1127         READ_BUF(28);
1128         READ32(dummy); /* headerpadsz is always 0 */
1129         READ32(sess->fore_channel.maxreq_sz);
1130         READ32(sess->fore_channel.maxresp_sz);
1131         READ32(sess->fore_channel.maxresp_cached);
1132         READ32(sess->fore_channel.maxops);
1133         READ32(sess->fore_channel.maxreqs);
1134         READ32(sess->fore_channel.nr_rdma_attrs);
1135         if (sess->fore_channel.nr_rdma_attrs == 1) {
1136                 READ_BUF(4);
1137                 READ32(sess->fore_channel.rdma_attrs);
1138         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1139                 dprintk("Too many fore channel attr bitmaps!\n");
1140                 goto xdr_error;
1141         }
1142
1143         /* Back channel attrs */
1144         READ_BUF(28);
1145         READ32(dummy); /* headerpadsz is always 0 */
1146         READ32(sess->back_channel.maxreq_sz);
1147         READ32(sess->back_channel.maxresp_sz);
1148         READ32(sess->back_channel.maxresp_cached);
1149         READ32(sess->back_channel.maxops);
1150         READ32(sess->back_channel.maxreqs);
1151         READ32(sess->back_channel.nr_rdma_attrs);
1152         if (sess->back_channel.nr_rdma_attrs == 1) {
1153                 READ_BUF(4);
1154                 READ32(sess->back_channel.rdma_attrs);
1155         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1156                 dprintk("Too many back channel attr bitmaps!\n");
1157                 goto xdr_error;
1158         }
1159
1160         READ_BUF(8);
1161         READ32(sess->callback_prog);
1162
1163         /* callback_sec_params4 */
1164         READ32(nr_secflavs);
1165         for (i = 0; i < nr_secflavs; ++i) {
1166                 READ_BUF(4);
1167                 READ32(dummy);
1168                 switch (dummy) {
1169                 case RPC_AUTH_NULL:
1170                         /* Nothing to read */
1171                         break;
1172                 case RPC_AUTH_UNIX:
1173                         READ_BUF(8);
1174                         /* stamp */
1175                         READ32(dummy);
1176
1177                         /* machine name */
1178                         READ32(dummy);
1179                         READ_BUF(dummy);
1180                         SAVEMEM(machine_name, dummy);
1181
1182                         /* uid, gid */
1183                         READ_BUF(8);
1184                         READ32(sess->uid);
1185                         READ32(sess->gid);
1186
1187                         /* more gids */
1188                         READ_BUF(4);
1189                         READ32(dummy);
1190                         READ_BUF(dummy * 4);
1191                         for (i = 0; i < dummy; ++i)
1192                                 READ32(dummy);
1193                         break;
1194                 case RPC_AUTH_GSS:
1195                         dprintk("RPC_AUTH_GSS callback secflavor "
1196                                 "not supported!\n");
1197                         READ_BUF(8);
1198                         /* gcbp_service */
1199                         READ32(dummy);
1200                         /* gcbp_handle_from_server */
1201                         READ32(dummy);
1202                         READ_BUF(dummy);
1203                         p += XDR_QUADLEN(dummy);
1204                         /* gcbp_handle_from_client */
1205                         READ_BUF(4);
1206                         READ32(dummy);
1207                         READ_BUF(dummy);
1208                         p += XDR_QUADLEN(dummy);
1209                         break;
1210                 default:
1211                         dprintk("Illegal callback secflavor\n");
1212                         return nfserr_inval;
1213                 }
1214         }
1215         DECODE_TAIL;
1216 }
1217
1218 static __be32
1219 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1220                              struct nfsd4_destroy_session *destroy_session)
1221 {
1222         DECODE_HEAD;
1223         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1224         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1225
1226         DECODE_TAIL;
1227 }
1228
1229 static __be32
1230 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1231                       struct nfsd4_sequence *seq)
1232 {
1233         DECODE_HEAD;
1234
1235         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1236         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1237         READ32(seq->seqid);
1238         READ32(seq->slotid);
1239         READ32(seq->maxslots);
1240         READ32(seq->cachethis);
1241
1242         DECODE_TAIL;
1243 }
1244
1245 static __be32
1246 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1247 {
1248         return nfs_ok;
1249 }
1250
1251 static __be32
1252 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1253 {
1254         return nfserr_notsupp;
1255 }
1256
1257 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1258
1259 static nfsd4_dec nfsd4_dec_ops[] = {
1260         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1261         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1262         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1263         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1264         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1265         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1266         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1267         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1268         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1269         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1270         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1271         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1272         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1273         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1274         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1275         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1276         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1277         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1278         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1279         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1280         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1281         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1282         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1283         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1284         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1285         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1286         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1287         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1288         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1289         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1290         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1291         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1292         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1293         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1294         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1295         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1296         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1297 };
1298
1299 static nfsd4_dec nfsd41_dec_ops[] = {
1300         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1301         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1302         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1303         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1304         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1305         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1306         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1307         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1308         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1309         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1310         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1311         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1312         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1313         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1314         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1315         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1316         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1317         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1318         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1319         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1320         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1321         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1322         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1323         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1324         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1325         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1326         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1327         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1328         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1329         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1330         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1331         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1332         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1333         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1334         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1335         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1336         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1337
1338         /* new operations for NFSv4.1 */
1339         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1340         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_notsupp,
1341         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1342         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1343         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1344         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1345         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1346         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1347         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1348         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1349         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1350         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1351         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_notsupp,
1352         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1353         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1354         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1355         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1356         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_notsupp,
1357         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_notsupp,
1358 };
1359
1360 struct nfsd4_minorversion_ops {
1361         nfsd4_dec *decoders;
1362         int nops;
1363 };
1364
1365 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1366         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1367         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1368 };
1369
1370 static __be32
1371 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1372 {
1373         DECODE_HEAD;
1374         struct nfsd4_op *op;
1375         struct nfsd4_minorversion_ops *ops;
1376         int i;
1377
1378         /*
1379          * XXX: According to spec, we should check the tag
1380          * for UTF-8 compliance.  I'm postponing this for
1381          * now because it seems that some clients do use
1382          * binary tags.
1383          */
1384         READ_BUF(4);
1385         READ32(argp->taglen);
1386         READ_BUF(argp->taglen + 8);
1387         SAVEMEM(argp->tag, argp->taglen);
1388         READ32(argp->minorversion);
1389         READ32(argp->opcnt);
1390
1391         if (argp->taglen > NFSD4_MAX_TAGLEN)
1392                 goto xdr_error;
1393         if (argp->opcnt > 100)
1394                 goto xdr_error;
1395
1396         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1397                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1398                 if (!argp->ops) {
1399                         argp->ops = argp->iops;
1400                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1401                         goto xdr_error;
1402                 }
1403         }
1404
1405         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1406                 argp->opcnt = 0;
1407
1408         ops = &nfsd4_minorversion[argp->minorversion];
1409         for (i = 0; i < argp->opcnt; i++) {
1410                 op = &argp->ops[i];
1411                 op->replay = NULL;
1412
1413                 /*
1414                  * We can't use READ_BUF() here because we need to handle
1415                  * a missing opcode as an OP_WRITE + 1. So we need to check
1416                  * to see if we're truly at the end of our buffer or if there
1417                  * is another page we need to flip to.
1418                  */
1419
1420                 if (argp->p == argp->end) {
1421                         if (argp->pagelen < 4) {
1422                                 /* There isn't an opcode still on the wire */
1423                                 op->opnum = OP_WRITE + 1;
1424                                 op->status = nfserr_bad_xdr;
1425                                 argp->opcnt = i+1;
1426                                 break;
1427                         }
1428
1429                         /*
1430                          * False alarm. We just hit a page boundary, but there
1431                          * is still data available.  Move pointer across page
1432                          * boundary.  *snip from READ_BUF*
1433                          */
1434                         argp->p = page_address(argp->pagelist[0]);
1435                         argp->pagelist++;
1436                         if (argp->pagelen < PAGE_SIZE) {
1437                                 argp->end = p + (argp->pagelen>>2);
1438                                 argp->pagelen = 0;
1439                         } else {
1440                                 argp->end = p + (PAGE_SIZE>>2);
1441                                 argp->pagelen -= PAGE_SIZE;
1442                         }
1443                 }
1444                 op->opnum = ntohl(*argp->p++);
1445
1446                 if (op->opnum >= OP_ACCESS && op->opnum < ops->nops)
1447                         op->status = ops->decoders[op->opnum](argp, &op->u);
1448                 else {
1449                         op->opnum = OP_ILLEGAL;
1450                         op->status = nfserr_op_illegal;
1451                 }
1452
1453                 if (op->status) {
1454                         argp->opcnt = i+1;
1455                         break;
1456                 }
1457         }
1458
1459         DECODE_TAIL;
1460 }
1461
1462 #define WRITE32(n)               *p++ = htonl(n)
1463 #define WRITE64(n)               do {                           \
1464         *p++ = htonl((u32)((n) >> 32));                         \
1465         *p++ = htonl((u32)(n));                                 \
1466 } while (0)
1467 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1468         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1469         memcpy(p, ptr, nbytes);                                 \
1470         p += XDR_QUADLEN(nbytes);                               \
1471 }} while (0)
1472
1473 static void write32(__be32 **p, u32 n)
1474 {
1475         *(*p)++ = n;
1476 }
1477
1478 static void write64(__be32 **p, u64 n)
1479 {
1480         write32(p, (u32)(n >> 32));
1481         write32(p, (u32)n);
1482 }
1483
1484 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1485 {
1486         if (IS_I_VERSION(inode)) {
1487                 write64(p, inode->i_version);
1488         } else {
1489                 write32(p, stat->ctime.tv_sec);
1490                 write32(p, stat->ctime.tv_nsec);
1491         }
1492 }
1493
1494 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1495 {
1496         write32(p, c->atomic);
1497         if (c->change_supported) {
1498                 write64(p, c->before_change);
1499                 write64(p, c->after_change);
1500         } else {
1501                 write32(p, c->before_ctime_sec);
1502                 write32(p, c->before_ctime_nsec);
1503                 write32(p, c->after_ctime_sec);
1504                 write32(p, c->after_ctime_nsec);
1505         }
1506 }
1507
1508 #define RESERVE_SPACE(nbytes)   do {                            \
1509         p = resp->p;                                            \
1510         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1511 } while (0)
1512 #define ADJUST_ARGS()           resp->p = p
1513
1514 /*
1515  * Header routine to setup seqid operation replay cache
1516  */
1517 #define ENCODE_SEQID_OP_HEAD                                    \
1518         __be32 *save;                                           \
1519                                                                 \
1520         save = resp->p;
1521
1522 /*
1523  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1524  * is where sequence id's are incremented, and the replay cache is filled.
1525  * Note that we increment sequence id's here, at the last moment, so we're sure
1526  * we know whether the error to be returned is a sequence id mutating error.
1527  */
1528
1529 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1530         if (seqid_mutating_err(nfserr) && stateowner) {         \
1531                 stateowner->so_seqid++;                         \
1532                 stateowner->so_replay.rp_status = nfserr;       \
1533                 stateowner->so_replay.rp_buflen =               \
1534                           (((char *)(resp)->p - (char *)save)); \
1535                 memcpy(stateowner->so_replay.rp_buf, save,      \
1536                         stateowner->so_replay.rp_buflen);       \
1537         } } while (0);
1538
1539 /* Encode as an array of strings the string given with components
1540  * seperated @sep.
1541  */
1542 static __be32 nfsd4_encode_components(char sep, char *components,
1543                                    __be32 **pp, int *buflen)
1544 {
1545         __be32 *p = *pp;
1546         __be32 *countp = p;
1547         int strlen, count=0;
1548         char *str, *end;
1549
1550         dprintk("nfsd4_encode_components(%s)\n", components);
1551         if ((*buflen -= 4) < 0)
1552                 return nfserr_resource;
1553         WRITE32(0); /* We will fill this in with @count later */
1554         end = str = components;
1555         while (*end) {
1556                 for (; *end && (*end != sep); end++)
1557                         ; /* Point to end of component */
1558                 strlen = end - str;
1559                 if (strlen) {
1560                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1561                                 return nfserr_resource;
1562                         WRITE32(strlen);
1563                         WRITEMEM(str, strlen);
1564                         count++;
1565                 }
1566                 else
1567                         end++;
1568                 str = end;
1569         }
1570         *pp = p;
1571         p = countp;
1572         WRITE32(count);
1573         return 0;
1574 }
1575
1576 /*
1577  * encode a location element of a fs_locations structure
1578  */
1579 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1580                                     __be32 **pp, int *buflen)
1581 {
1582         __be32 status;
1583         __be32 *p = *pp;
1584
1585         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1586         if (status)
1587                 return status;
1588         status = nfsd4_encode_components('/', location->path, &p, buflen);
1589         if (status)
1590                 return status;
1591         *pp = p;
1592         return 0;
1593 }
1594
1595 /*
1596  * Return the path to an export point in the pseudo filesystem namespace
1597  * Returned string is safe to use as long as the caller holds a reference
1598  * to @exp.
1599  */
1600 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1601 {
1602         struct svc_fh tmp_fh;
1603         char *path = NULL, *rootpath;
1604         size_t rootlen;
1605
1606         fh_init(&tmp_fh, NFS4_FHSIZE);
1607         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1608         if (*stat)
1609                 return NULL;
1610         rootpath = tmp_fh.fh_export->ex_pathname;
1611
1612         path = exp->ex_pathname;
1613
1614         rootlen = strlen(rootpath);
1615         if (strncmp(path, rootpath, rootlen)) {
1616                 dprintk("nfsd: fs_locations failed;"
1617                         "%s is not contained in %s\n", path, rootpath);
1618                 *stat = nfserr_notsupp;
1619                 path = NULL;
1620                 goto out;
1621         }
1622         path += rootlen;
1623 out:
1624         fh_put(&tmp_fh);
1625         return path;
1626 }
1627
1628 /*
1629  *  encode a fs_locations structure
1630  */
1631 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1632                                      struct svc_export *exp,
1633                                      __be32 **pp, int *buflen)
1634 {
1635         __be32 status;
1636         int i;
1637         __be32 *p = *pp;
1638         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1639         char *root = nfsd4_path(rqstp, exp, &status);
1640
1641         if (status)
1642                 return status;
1643         status = nfsd4_encode_components('/', root, &p, buflen);
1644         if (status)
1645                 return status;
1646         if ((*buflen -= 4) < 0)
1647                 return nfserr_resource;
1648         WRITE32(fslocs->locations_count);
1649         for (i=0; i<fslocs->locations_count; i++) {
1650                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1651                                                    &p, buflen);
1652                 if (status)
1653                         return status;
1654         }
1655         *pp = p;
1656         return 0;
1657 }
1658
1659 static u32 nfs4_ftypes[16] = {
1660         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1661         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1662         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1663         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1664 };
1665
1666 static __be32
1667 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1668                         __be32 **p, int *buflen)
1669 {
1670         int status;
1671
1672         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1673                 return nfserr_resource;
1674         if (whotype != NFS4_ACL_WHO_NAMED)
1675                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1676         else if (group)
1677                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1678         else
1679                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1680         if (status < 0)
1681                 return nfserrno(status);
1682         *p = xdr_encode_opaque(*p, NULL, status);
1683         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1684         BUG_ON(*buflen < 0);
1685         return 0;
1686 }
1687
1688 static inline __be32
1689 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1690 {
1691         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1692 }
1693
1694 static inline __be32
1695 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1696 {
1697         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1698 }
1699
1700 static inline __be32
1701 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1702                 __be32 **p, int *buflen)
1703 {
1704         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1705 }
1706
1707 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1708                               FATTR4_WORD0_RDATTR_ERROR)
1709 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1710
1711 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1712 {
1713         /* As per referral draft:  */
1714         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1715             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1716                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1717                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1718                         *rdattr_err = NFSERR_MOVED;
1719                 else
1720                         return nfserr_moved;
1721         }
1722         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1723         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1724         return 0;
1725 }
1726
1727 /*
1728  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1729  * ourselves.
1730  *
1731  * @countp is the buffer size in _words_; upon successful return this becomes
1732  * replaced with the number of words written.
1733  */
1734 __be32
1735 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1736                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1737                 struct svc_rqst *rqstp, int ignore_crossmnt)
1738 {
1739         u32 bmval0 = bmval[0];
1740         u32 bmval1 = bmval[1];
1741         u32 bmval2 = bmval[2];
1742         struct kstat stat;
1743         struct svc_fh tempfh;
1744         struct kstatfs statfs;
1745         int buflen = *countp << 2;
1746         __be32 *attrlenp;
1747         u32 dummy;
1748         u64 dummy64;
1749         u32 rdattr_err = 0;
1750         __be32 *p = buffer;
1751         __be32 status;
1752         int err;
1753         int aclsupport = 0;
1754         struct nfs4_acl *acl = NULL;
1755         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1756         u32 minorversion = resp->cstate.minorversion;
1757
1758         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1759         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1760         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1761         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1762
1763         if (exp->ex_fslocs.migrated) {
1764                 BUG_ON(bmval[2]);
1765                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1766                 if (status)
1767                         goto out;
1768         }
1769
1770         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1771         if (err)
1772                 goto out_nfserr;
1773         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1774                         FATTR4_WORD0_MAXNAME)) ||
1775             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1776                        FATTR4_WORD1_SPACE_TOTAL))) {
1777                 err = vfs_statfs(dentry, &statfs);
1778                 if (err)
1779                         goto out_nfserr;
1780         }
1781         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1782                 fh_init(&tempfh, NFS4_FHSIZE);
1783                 status = fh_compose(&tempfh, exp, dentry, NULL);
1784                 if (status)
1785                         goto out;
1786                 fhp = &tempfh;
1787         }
1788         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1789                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1790                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1791                 aclsupport = (err == 0);
1792                 if (bmval0 & FATTR4_WORD0_ACL) {
1793                         if (err == -EOPNOTSUPP)
1794                                 bmval0 &= ~FATTR4_WORD0_ACL;
1795                         else if (err == -EINVAL) {
1796                                 status = nfserr_attrnotsupp;
1797                                 goto out;
1798                         } else if (err != 0)
1799                                 goto out_nfserr;
1800                 }
1801         }
1802         if ((buflen -= 16) < 0)
1803                 goto out_resource;
1804
1805         if (unlikely(bmval2)) {
1806                 WRITE32(3);
1807                 WRITE32(bmval0);
1808                 WRITE32(bmval1);
1809                 WRITE32(bmval2);
1810         } else if (likely(bmval1)) {
1811                 WRITE32(2);
1812                 WRITE32(bmval0);
1813                 WRITE32(bmval1);
1814         } else {
1815                 WRITE32(1);
1816                 WRITE32(bmval0);
1817         }
1818         attrlenp = p++;                /* to be backfilled later */
1819
1820         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1821                 u32 word0 = nfsd_suppattrs0(minorversion);
1822                 u32 word1 = nfsd_suppattrs1(minorversion);
1823                 u32 word2 = nfsd_suppattrs2(minorversion);
1824
1825                 if ((buflen -= 12) < 0)
1826                         goto out_resource;
1827                 if (!aclsupport)
1828                         word0 &= ~FATTR4_WORD0_ACL;
1829                 if (!word2) {
1830                         WRITE32(2);
1831                         WRITE32(word0);
1832                         WRITE32(word1);
1833                 } else {
1834                         WRITE32(3);
1835                         WRITE32(word0);
1836                         WRITE32(word1);
1837                         WRITE32(word2);
1838                 }
1839         }
1840         if (bmval0 & FATTR4_WORD0_TYPE) {
1841                 if ((buflen -= 4) < 0)
1842                         goto out_resource;
1843                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1844                 if (dummy == NF4BAD)
1845                         goto out_serverfault;
1846                 WRITE32(dummy);
1847         }
1848         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1849                 if ((buflen -= 4) < 0)
1850                         goto out_resource;
1851                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1852                         WRITE32(NFS4_FH_PERSISTENT);
1853                 else
1854                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1855         }
1856         if (bmval0 & FATTR4_WORD0_CHANGE) {
1857                 if ((buflen -= 8) < 0)
1858                         goto out_resource;
1859                 write_change(&p, &stat, dentry->d_inode);
1860         }
1861         if (bmval0 & FATTR4_WORD0_SIZE) {
1862                 if ((buflen -= 8) < 0)
1863                         goto out_resource;
1864                 WRITE64(stat.size);
1865         }
1866         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1867                 if ((buflen -= 4) < 0)
1868                         goto out_resource;
1869                 WRITE32(1);
1870         }
1871         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1872                 if ((buflen -= 4) < 0)
1873                         goto out_resource;
1874                 WRITE32(1);
1875         }
1876         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1877                 if ((buflen -= 4) < 0)
1878                         goto out_resource;
1879                 WRITE32(0);
1880         }
1881         if (bmval0 & FATTR4_WORD0_FSID) {
1882                 if ((buflen -= 16) < 0)
1883                         goto out_resource;
1884                 if (exp->ex_fslocs.migrated) {
1885                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1886                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1887                 } else switch(fsid_source(fhp)) {
1888                 case FSIDSOURCE_FSID:
1889                         WRITE64((u64)exp->ex_fsid);
1890                         WRITE64((u64)0);
1891                         break;
1892                 case FSIDSOURCE_DEV:
1893                         WRITE32(0);
1894                         WRITE32(MAJOR(stat.dev));
1895                         WRITE32(0);
1896                         WRITE32(MINOR(stat.dev));
1897                         break;
1898                 case FSIDSOURCE_UUID:
1899                         WRITEMEM(exp->ex_uuid, 16);
1900                         break;
1901                 }
1902         }
1903         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1904                 if ((buflen -= 4) < 0)
1905                         goto out_resource;
1906                 WRITE32(0);
1907         }
1908         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1909                 if ((buflen -= 4) < 0)
1910                         goto out_resource;
1911                 WRITE32(NFSD_LEASE_TIME);
1912         }
1913         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1914                 if ((buflen -= 4) < 0)
1915                         goto out_resource;
1916                 WRITE32(rdattr_err);
1917         }
1918         if (bmval0 & FATTR4_WORD0_ACL) {
1919                 struct nfs4_ace *ace;
1920
1921                 if (acl == NULL) {
1922                         if ((buflen -= 4) < 0)
1923                                 goto out_resource;
1924
1925                         WRITE32(0);
1926                         goto out_acl;
1927                 }
1928                 if ((buflen -= 4) < 0)
1929                         goto out_resource;
1930                 WRITE32(acl->naces);
1931
1932                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1933                         if ((buflen -= 4*3) < 0)
1934                                 goto out_resource;
1935                         WRITE32(ace->type);
1936                         WRITE32(ace->flag);
1937                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1938                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1939                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1940                                 &p, &buflen);
1941                         if (status == nfserr_resource)
1942                                 goto out_resource;
1943                         if (status)
1944                                 goto out;
1945                 }
1946         }
1947 out_acl:
1948         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1949                 if ((buflen -= 4) < 0)
1950                         goto out_resource;
1951                 WRITE32(aclsupport ?
1952                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1953         }
1954         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1955                 if ((buflen -= 4) < 0)
1956                         goto out_resource;
1957                 WRITE32(1);
1958         }
1959         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1960                 if ((buflen -= 4) < 0)
1961                         goto out_resource;
1962                 WRITE32(1);
1963         }
1964         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1965                 if ((buflen -= 4) < 0)
1966                         goto out_resource;
1967                 WRITE32(1);
1968         }
1969         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1970                 if ((buflen -= 4) < 0)
1971                         goto out_resource;
1972                 WRITE32(1);
1973         }
1974         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1975                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1976                 if (buflen < 0)
1977                         goto out_resource;
1978                 WRITE32(fhp->fh_handle.fh_size);
1979                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1980         }
1981         if (bmval0 & FATTR4_WORD0_FILEID) {
1982                 if ((buflen -= 8) < 0)
1983                         goto out_resource;
1984                 WRITE64(stat.ino);
1985         }
1986         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1987                 if ((buflen -= 8) < 0)
1988                         goto out_resource;
1989                 WRITE64((u64) statfs.f_ffree);
1990         }
1991         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1992                 if ((buflen -= 8) < 0)
1993                         goto out_resource;
1994                 WRITE64((u64) statfs.f_ffree);
1995         }
1996         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1997                 if ((buflen -= 8) < 0)
1998                         goto out_resource;
1999                 WRITE64((u64) statfs.f_files);
2000         }
2001         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2002                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2003                 if (status == nfserr_resource)
2004                         goto out_resource;
2005                 if (status)
2006                         goto out;
2007         }
2008         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2009                 if ((buflen -= 4) < 0)
2010                         goto out_resource;
2011                 WRITE32(1);
2012         }
2013         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2014                 if ((buflen -= 8) < 0)
2015                         goto out_resource;
2016                 WRITE64(~(u64)0);
2017         }
2018         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2019                 if ((buflen -= 4) < 0)
2020                         goto out_resource;
2021                 WRITE32(255);
2022         }
2023         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2024                 if ((buflen -= 4) < 0)
2025                         goto out_resource;
2026                 WRITE32(statfs.f_namelen);
2027         }
2028         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2029                 if ((buflen -= 8) < 0)
2030                         goto out_resource;
2031                 WRITE64((u64) svc_max_payload(rqstp));
2032         }
2033         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2034                 if ((buflen -= 8) < 0)
2035                         goto out_resource;
2036                 WRITE64((u64) svc_max_payload(rqstp));
2037         }
2038         if (bmval1 & FATTR4_WORD1_MODE) {
2039                 if ((buflen -= 4) < 0)
2040                         goto out_resource;
2041                 WRITE32(stat.mode & S_IALLUGO);
2042         }
2043         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2044                 if ((buflen -= 4) < 0)
2045                         goto out_resource;
2046                 WRITE32(1);
2047         }
2048         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2049                 if ((buflen -= 4) < 0)
2050                         goto out_resource;
2051                 WRITE32(stat.nlink);
2052         }
2053         if (bmval1 & FATTR4_WORD1_OWNER) {
2054                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2055                 if (status == nfserr_resource)
2056                         goto out_resource;
2057                 if (status)
2058                         goto out;
2059         }
2060         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2061                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2062                 if (status == nfserr_resource)
2063                         goto out_resource;
2064                 if (status)
2065                         goto out;
2066         }
2067         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2068                 if ((buflen -= 8) < 0)
2069                         goto out_resource;
2070                 WRITE32((u32) MAJOR(stat.rdev));
2071                 WRITE32((u32) MINOR(stat.rdev));
2072         }
2073         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2074                 if ((buflen -= 8) < 0)
2075                         goto out_resource;
2076                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2077                 WRITE64(dummy64);
2078         }
2079         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2080                 if ((buflen -= 8) < 0)
2081                         goto out_resource;
2082                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2083                 WRITE64(dummy64);
2084         }
2085         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2086                 if ((buflen -= 8) < 0)
2087                         goto out_resource;
2088                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2089                 WRITE64(dummy64);
2090         }
2091         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2092                 if ((buflen -= 8) < 0)
2093                         goto out_resource;
2094                 dummy64 = (u64)stat.blocks << 9;
2095                 WRITE64(dummy64);
2096         }
2097         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2098                 if ((buflen -= 12) < 0)
2099                         goto out_resource;
2100                 WRITE32(0);
2101                 WRITE32(stat.atime.tv_sec);
2102                 WRITE32(stat.atime.tv_nsec);
2103         }
2104         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2105                 if ((buflen -= 12) < 0)
2106                         goto out_resource;
2107                 WRITE32(0);
2108                 WRITE32(1);
2109                 WRITE32(0);
2110         }
2111         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2112                 if ((buflen -= 12) < 0)
2113                         goto out_resource;
2114                 WRITE32(0);
2115                 WRITE32(stat.ctime.tv_sec);
2116                 WRITE32(stat.ctime.tv_nsec);
2117         }
2118         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2119                 if ((buflen -= 12) < 0)
2120                         goto out_resource;
2121                 WRITE32(0);
2122                 WRITE32(stat.mtime.tv_sec);
2123                 WRITE32(stat.mtime.tv_nsec);
2124         }
2125         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2126                 if ((buflen -= 8) < 0)
2127                         goto out_resource;
2128                 /*
2129                  * Get parent's attributes if not ignoring crossmount
2130                  * and this is the root of a cross-mounted filesystem.
2131                  */
2132                 if (ignore_crossmnt == 0 &&
2133                     exp->ex_path.mnt->mnt_root->d_inode == dentry->d_inode) {
2134                         err = vfs_getattr(exp->ex_path.mnt->mnt_parent,
2135                                 exp->ex_path.mnt->mnt_mountpoint, &stat);
2136                         if (err)
2137                                 goto out_nfserr;
2138                 }
2139                 WRITE64(stat.ino);
2140         }
2141         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2142                 WRITE32(3);
2143                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2144                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2145                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2146         }
2147
2148         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2149         *countp = p - buffer;
2150         status = nfs_ok;
2151
2152 out:
2153         kfree(acl);
2154         if (fhp == &tempfh)
2155                 fh_put(&tempfh);
2156         return status;
2157 out_nfserr:
2158         status = nfserrno(err);
2159         goto out;
2160 out_resource:
2161         *countp = 0;
2162         status = nfserr_resource;
2163         goto out;
2164 out_serverfault:
2165         status = nfserr_serverfault;
2166         goto out;
2167 }
2168
2169 static inline int attributes_need_mount(u32 *bmval)
2170 {
2171         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2172                 return 1;
2173         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2174                 return 1;
2175         return 0;
2176 }
2177
2178 static __be32
2179 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2180                 const char *name, int namlen, __be32 *p, int *buflen)
2181 {
2182         struct svc_export *exp = cd->rd_fhp->fh_export;
2183         struct dentry *dentry;
2184         __be32 nfserr;
2185         int ignore_crossmnt = 0;
2186
2187         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2188         if (IS_ERR(dentry))
2189                 return nfserrno(PTR_ERR(dentry));
2190         if (!dentry->d_inode) {
2191                 /*
2192                  * nfsd_buffered_readdir drops the i_mutex between
2193                  * readdir and calling this callback, leaving a window
2194                  * where this directory entry could have gone away.
2195                  */
2196                 dput(dentry);
2197                 return nfserr_noent;
2198         }
2199
2200         exp_get(exp);
2201         /*
2202          * In the case of a mountpoint, the client may be asking for
2203          * attributes that are only properties of the underlying filesystem
2204          * as opposed to the cross-mounted file system. In such a case,
2205          * we will not follow the cross mount and will fill the attribtutes
2206          * directly from the mountpoint dentry.
2207          */
2208         if (d_mountpoint(dentry) && !attributes_need_mount(cd->rd_bmval))
2209                 ignore_crossmnt = 1;
2210         else if (d_mountpoint(dentry)) {
2211                 int err;
2212
2213                 /*
2214                  * Why the heck aren't we just using nfsd_lookup??
2215                  * Different "."/".." handling?  Something else?
2216                  * At least, add a comment here to explain....
2217                  */
2218                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2219                 if (err) {
2220                         nfserr = nfserrno(err);
2221                         goto out_put;
2222                 }
2223                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2224                 if (nfserr)
2225                         goto out_put;
2226
2227         }
2228         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2229                                         cd->rd_rqstp, ignore_crossmnt);
2230 out_put:
2231         dput(dentry);
2232         exp_put(exp);
2233         return nfserr;
2234 }
2235
2236 static __be32 *
2237 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2238 {
2239         __be32 *attrlenp;
2240
2241         if (buflen < 6)
2242                 return NULL;
2243         *p++ = htonl(2);
2244         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2245         *p++ = htonl(0);                         /* bmval1 */
2246
2247         attrlenp = p++;
2248         *p++ = nfserr;       /* no htonl */
2249         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2250         return p;
2251 }
2252
2253 static int
2254 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2255                     loff_t offset, u64 ino, unsigned int d_type)
2256 {
2257         struct readdir_cd *ccd = ccdv;
2258         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2259         int buflen;
2260         __be32 *p = cd->buffer;
2261         __be32 *cookiep;
2262         __be32 nfserr = nfserr_toosmall;
2263
2264         /* In nfsv4, "." and ".." never make it onto the wire.. */
2265         if (name && isdotent(name, namlen)) {
2266                 cd->common.err = nfs_ok;
2267                 return 0;
2268         }
2269
2270         if (cd->offset)
2271                 xdr_encode_hyper(cd->offset, (u64) offset);
2272
2273         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2274         if (buflen < 0)
2275                 goto fail;
2276
2277         *p++ = xdr_one;                             /* mark entry present */
2278         cookiep = p;
2279         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2280         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2281
2282         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2283         switch (nfserr) {
2284         case nfs_ok:
2285                 p += buflen;
2286                 break;
2287         case nfserr_resource:
2288                 nfserr = nfserr_toosmall;
2289                 goto fail;
2290         case nfserr_dropit:
2291                 goto fail;
2292         case nfserr_noent:
2293                 goto skip_entry;
2294         default:
2295                 /*
2296                  * If the client requested the RDATTR_ERROR attribute,
2297                  * we stuff the error code into this attribute
2298                  * and continue.  If this attribute was not requested,
2299                  * then in accordance with the spec, we fail the
2300                  * entire READDIR operation(!)
2301                  */
2302                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2303                         goto fail;
2304                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2305                 if (p == NULL) {
2306                         nfserr = nfserr_toosmall;
2307                         goto fail;
2308                 }
2309         }
2310         cd->buflen -= (p - cd->buffer);
2311         cd->buffer = p;
2312         cd->offset = cookiep;
2313 skip_entry:
2314         cd->common.err = nfs_ok;
2315         return 0;
2316 fail:
2317         cd->common.err = nfserr;
2318         return -EINVAL;
2319 }
2320
2321 static void
2322 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2323 {
2324         __be32 *p;
2325
2326         RESERVE_SPACE(sizeof(stateid_t));
2327         WRITE32(sid->si_generation);
2328         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2329         ADJUST_ARGS();
2330 }
2331
2332 static __be32
2333 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2334 {
2335         __be32 *p;
2336
2337         if (!nfserr) {
2338                 RESERVE_SPACE(8);
2339                 WRITE32(access->ac_supported);
2340                 WRITE32(access->ac_resp_access);
2341                 ADJUST_ARGS();
2342         }
2343         return nfserr;
2344 }
2345
2346 static __be32
2347 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2348 {
2349         ENCODE_SEQID_OP_HEAD;
2350
2351         if (!nfserr)
2352                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2353
2354         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2355         return nfserr;
2356 }
2357
2358
2359 static __be32
2360 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2361 {
2362         __be32 *p;
2363
2364         if (!nfserr) {
2365                 RESERVE_SPACE(8);
2366                 WRITEMEM(commit->co_verf.data, 8);
2367                 ADJUST_ARGS();
2368         }
2369         return nfserr;
2370 }
2371
2372 static __be32
2373 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2374 {
2375         __be32 *p;
2376
2377         if (!nfserr) {
2378                 RESERVE_SPACE(32);
2379                 write_cinfo(&p, &create->cr_cinfo);
2380                 WRITE32(2);
2381                 WRITE32(create->cr_bmval[0]);
2382                 WRITE32(create->cr_bmval[1]);
2383                 ADJUST_ARGS();
2384         }
2385         return nfserr;
2386 }
2387
2388 static __be32
2389 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2390 {
2391         struct svc_fh *fhp = getattr->ga_fhp;
2392         int buflen;
2393
2394         if (nfserr)
2395                 return nfserr;
2396
2397         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2398         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2399                                     resp->p, &buflen, getattr->ga_bmval,
2400                                     resp->rqstp, 0);
2401         if (!nfserr)
2402                 resp->p += buflen;
2403         return nfserr;
2404 }
2405
2406 static __be32
2407 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2408 {
2409         struct svc_fh *fhp = *fhpp;
2410         unsigned int len;
2411         __be32 *p;
2412
2413         if (!nfserr) {
2414                 len = fhp->fh_handle.fh_size;
2415                 RESERVE_SPACE(len + 4);
2416                 WRITE32(len);
2417                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2418                 ADJUST_ARGS();
2419         }
2420         return nfserr;
2421 }
2422
2423 /*
2424 * Including all fields other than the name, a LOCK4denied structure requires
2425 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2426 */
2427 static void
2428 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2429 {
2430         __be32 *p;
2431
2432         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2433         WRITE64(ld->ld_start);
2434         WRITE64(ld->ld_length);
2435         WRITE32(ld->ld_type);
2436         if (ld->ld_sop) {
2437                 WRITEMEM(&ld->ld_clientid, 8);
2438                 WRITE32(ld->ld_sop->so_owner.len);
2439                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2440                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2441         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2442                 WRITE64((u64)0); /* clientid */
2443                 WRITE32(0); /* length of owner name */
2444         }
2445         ADJUST_ARGS();
2446 }
2447
2448 static __be32
2449 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2450 {
2451         ENCODE_SEQID_OP_HEAD;
2452
2453         if (!nfserr)
2454                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2455         else if (nfserr == nfserr_denied)
2456                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2457
2458         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2459         return nfserr;
2460 }
2461
2462 static __be32
2463 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2464 {
2465         if (nfserr == nfserr_denied)
2466                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2467         return nfserr;
2468 }
2469
2470 static __be32
2471 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2472 {
2473         ENCODE_SEQID_OP_HEAD;
2474
2475         if (!nfserr)
2476                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2477
2478         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2479         return nfserr;
2480 }
2481
2482
2483 static __be32
2484 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2485 {
2486         __be32 *p;
2487
2488         if (!nfserr) {
2489                 RESERVE_SPACE(20);
2490                 write_cinfo(&p, &link->li_cinfo);
2491                 ADJUST_ARGS();
2492         }
2493         return nfserr;
2494 }
2495
2496
2497 static __be32
2498 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2499 {
2500         __be32 *p;
2501         ENCODE_SEQID_OP_HEAD;
2502
2503         if (nfserr)
2504                 goto out;
2505
2506         nfsd4_encode_stateid(resp, &open->op_stateid);
2507         RESERVE_SPACE(40);
2508         write_cinfo(&p, &open->op_cinfo);
2509         WRITE32(open->op_rflags);
2510         WRITE32(2);
2511         WRITE32(open->op_bmval[0]);
2512         WRITE32(open->op_bmval[1]);
2513         WRITE32(open->op_delegate_type);
2514         ADJUST_ARGS();
2515
2516         switch (open->op_delegate_type) {
2517         case NFS4_OPEN_DELEGATE_NONE:
2518                 break;
2519         case NFS4_OPEN_DELEGATE_READ:
2520                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2521                 RESERVE_SPACE(20);
2522                 WRITE32(open->op_recall);
2523
2524                 /*
2525                  * TODO: ACE's in delegations
2526                  */
2527                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2528                 WRITE32(0);
2529                 WRITE32(0);
2530                 WRITE32(0);   /* XXX: is NULL principal ok? */
2531                 ADJUST_ARGS();
2532                 break;
2533         case NFS4_OPEN_DELEGATE_WRITE:
2534                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2535                 RESERVE_SPACE(32);
2536                 WRITE32(0);
2537
2538                 /*
2539                  * TODO: space_limit's in delegations
2540                  */
2541                 WRITE32(NFS4_LIMIT_SIZE);
2542                 WRITE32(~(u32)0);
2543                 WRITE32(~(u32)0);
2544
2545                 /*
2546                  * TODO: ACE's in delegations
2547                  */
2548                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2549                 WRITE32(0);
2550                 WRITE32(0);
2551                 WRITE32(0);   /* XXX: is NULL principal ok? */
2552                 ADJUST_ARGS();
2553                 break;
2554         default:
2555                 BUG();
2556         }
2557         /* XXX save filehandle here */
2558 out:
2559         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2560         return nfserr;
2561 }
2562
2563 static __be32
2564 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2565 {
2566         ENCODE_SEQID_OP_HEAD;
2567
2568         if (!nfserr)
2569                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2570
2571         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2572         return nfserr;
2573 }
2574
2575 static __be32
2576 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2577 {
2578         ENCODE_SEQID_OP_HEAD;
2579
2580         if (!nfserr)
2581                 nfsd4_encode_stateid(resp, &od->od_stateid);
2582
2583         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2584         return nfserr;
2585 }
2586
2587 static __be32
2588 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2589                   struct nfsd4_read *read)
2590 {
2591         u32 eof;
2592         int v, pn;
2593         unsigned long maxcount;
2594         long len;
2595         __be32 *p;
2596
2597         if (nfserr)
2598                 return nfserr;
2599         if (resp->xbuf->page_len)
2600                 return nfserr_resource;
2601
2602         RESERVE_SPACE(8); /* eof flag and byte count */
2603
2604         maxcount = svc_max_payload(resp->rqstp);
2605         if (maxcount > read->rd_length)
2606                 maxcount = read->rd_length;
2607
2608         len = maxcount;
2609         v = 0;
2610         while (len > 0) {
2611                 pn = resp->rqstp->rq_resused++;
2612                 resp->rqstp->rq_vec[v].iov_base =
2613                         page_address(resp->rqstp->rq_respages[pn]);
2614                 resp->rqstp->rq_vec[v].iov_len =
2615                         len < PAGE_SIZE ? len : PAGE_SIZE;
2616                 v++;
2617                 len -= PAGE_SIZE;
2618         }
2619         read->rd_vlen = v;
2620
2621         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2622                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2623                         &maxcount);
2624
2625         if (nfserr == nfserr_symlink)
2626                 nfserr = nfserr_inval;
2627         if (nfserr)
2628                 return nfserr;
2629         eof = (read->rd_offset + maxcount >=
2630                read->rd_fhp->fh_dentry->d_inode->i_size);
2631
2632         WRITE32(eof);
2633         WRITE32(maxcount);
2634         ADJUST_ARGS();
2635         resp->xbuf->head[0].iov_len = (char*)p
2636                                         - (char*)resp->xbuf->head[0].iov_base;
2637         resp->xbuf->page_len = maxcount;
2638
2639         /* Use rest of head for padding and remaining ops: */
2640         resp->xbuf->tail[0].iov_base = p;
2641         resp->xbuf->tail[0].iov_len = 0;
2642         if (maxcount&3) {
2643                 RESERVE_SPACE(4);
2644                 WRITE32(0);
2645                 resp->xbuf->tail[0].iov_base += maxcount&3;
2646                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2647                 ADJUST_ARGS();
2648         }
2649         return 0;
2650 }
2651
2652 static __be32
2653 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2654 {
2655         int maxcount;
2656         char *page;
2657         __be32 *p;
2658
2659         if (nfserr)
2660                 return nfserr;
2661         if (resp->xbuf->page_len)
2662                 return nfserr_resource;
2663
2664         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2665
2666         maxcount = PAGE_SIZE;
2667         RESERVE_SPACE(4);
2668
2669         /*
2670          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2671          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2672          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2673          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2674          */
2675         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2676         if (nfserr == nfserr_isdir)
2677                 return nfserr_inval;
2678         if (nfserr)
2679                 return nfserr;
2680
2681         WRITE32(maxcount);
2682         ADJUST_ARGS();
2683         resp->xbuf->head[0].iov_len = (char*)p
2684                                 - (char*)resp->xbuf->head[0].iov_base;
2685         resp->xbuf->page_len = maxcount;
2686
2687         /* Use rest of head for padding and remaining ops: */
2688         resp->xbuf->tail[0].iov_base = p;
2689         resp->xbuf->tail[0].iov_len = 0;
2690         if (maxcount&3) {
2691                 RESERVE_SPACE(4);
2692                 WRITE32(0);
2693                 resp->xbuf->tail[0].iov_base += maxcount&3;
2694                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2695                 ADJUST_ARGS();
2696         }
2697         return 0;
2698 }
2699
2700 static __be32
2701 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2702 {
2703         int maxcount;
2704         loff_t offset;
2705         __be32 *page, *savep, *tailbase;
2706         __be32 *p;
2707
2708         if (nfserr)
2709                 return nfserr;
2710         if (resp->xbuf->page_len)
2711                 return nfserr_resource;
2712
2713         RESERVE_SPACE(8);  /* verifier */
2714         savep = p;
2715
2716         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2717         WRITE32(0);
2718         WRITE32(0);
2719         ADJUST_ARGS();
2720         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2721         tailbase = p;
2722
2723         maxcount = PAGE_SIZE;
2724         if (maxcount > readdir->rd_maxcount)
2725                 maxcount = readdir->rd_maxcount;
2726
2727         /*
2728          * Convert from bytes to words, account for the two words already
2729          * written, make sure to leave two words at the end for the next
2730          * pointer and eof field.
2731          */
2732         maxcount = (maxcount >> 2) - 4;
2733         if (maxcount < 0) {
2734                 nfserr =  nfserr_toosmall;
2735                 goto err_no_verf;
2736         }
2737
2738         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2739         readdir->common.err = 0;
2740         readdir->buflen = maxcount;
2741         readdir->buffer = page;
2742         readdir->offset = NULL;
2743
2744         offset = readdir->rd_cookie;
2745         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2746                               &offset,
2747                               &readdir->common, nfsd4_encode_dirent);
2748         if (nfserr == nfs_ok &&
2749             readdir->common.err == nfserr_toosmall &&
2750             readdir->buffer == page)
2751                 nfserr = nfserr_toosmall;
2752         if (nfserr == nfserr_symlink)
2753                 nfserr = nfserr_notdir;
2754         if (nfserr)
2755                 goto err_no_verf;
2756
2757         if (readdir->offset)
2758                 xdr_encode_hyper(readdir->offset, offset);
2759
2760         p = readdir->buffer;
2761         *p++ = 0;       /* no more entries */
2762         *p++ = htonl(readdir->common.err == nfserr_eof);
2763         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2764                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2765
2766         /* Use rest of head for padding and remaining ops: */
2767         resp->xbuf->tail[0].iov_base = tailbase;
2768         resp->xbuf->tail[0].iov_len = 0;
2769         resp->p = resp->xbuf->tail[0].iov_base;
2770         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2771
2772         return 0;
2773 err_no_verf:
2774         p = savep;
2775         ADJUST_ARGS();
2776         return nfserr;
2777 }
2778
2779 static __be32
2780 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2781 {
2782         __be32 *p;
2783
2784         if (!nfserr) {
2785                 RESERVE_SPACE(20);
2786                 write_cinfo(&p, &remove->rm_cinfo);
2787                 ADJUST_ARGS();
2788         }
2789         return nfserr;
2790 }
2791
2792 static __be32
2793 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2794 {
2795         __be32 *p;
2796
2797         if (!nfserr) {
2798                 RESERVE_SPACE(40);
2799                 write_cinfo(&p, &rename->rn_sinfo);
2800                 write_cinfo(&p, &rename->rn_tinfo);
2801                 ADJUST_ARGS();
2802         }
2803         return nfserr;
2804 }
2805
2806 static __be32
2807 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2808                      struct nfsd4_secinfo *secinfo)
2809 {
2810         int i = 0;
2811         struct svc_export *exp = secinfo->si_exp;
2812         u32 nflavs;
2813         struct exp_flavor_info *flavs;
2814         struct exp_flavor_info def_flavs[2];
2815         __be32 *p;
2816
2817         if (nfserr)
2818                 goto out;
2819         if (exp->ex_nflavors) {
2820                 flavs = exp->ex_flavors;
2821                 nflavs = exp->ex_nflavors;
2822         } else { /* Handling of some defaults in absence of real secinfo: */
2823                 flavs = def_flavs;
2824                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2825                         nflavs = 2;
2826                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2827                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2828                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2829                         nflavs = 1;
2830                         flavs[0].pseudoflavor
2831                                         = svcauth_gss_flavor(exp->ex_client);
2832                 } else {
2833                         nflavs = 1;
2834                         flavs[0].pseudoflavor
2835                                         = exp->ex_client->flavour->flavour;
2836                 }
2837         }
2838
2839         RESERVE_SPACE(4);
2840         WRITE32(nflavs);
2841         ADJUST_ARGS();
2842         for (i = 0; i < nflavs; i++) {
2843                 u32 flav = flavs[i].pseudoflavor;
2844                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2845
2846                 if (gm) {
2847                         RESERVE_SPACE(4);
2848                         WRITE32(RPC_AUTH_GSS);
2849                         ADJUST_ARGS();
2850                         RESERVE_SPACE(4 + gm->gm_oid.len);
2851                         WRITE32(gm->gm_oid.len);
2852                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2853                         ADJUST_ARGS();
2854                         RESERVE_SPACE(4);
2855                         WRITE32(0); /* qop */
2856                         ADJUST_ARGS();
2857                         RESERVE_SPACE(4);
2858                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2859                         ADJUST_ARGS();
2860                         gss_mech_put(gm);
2861                 } else {
2862                         RESERVE_SPACE(4);
2863                         WRITE32(flav);
2864                         ADJUST_ARGS();
2865                 }
2866         }
2867 out:
2868         if (exp)
2869                 exp_put(exp);
2870         return nfserr;
2871 }
2872
2873 /*
2874  * The SETATTR encode routine is special -- it always encodes a bitmap,
2875  * regardless of the error status.
2876  */
2877 static __be32
2878 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2879 {
2880         __be32 *p;
2881
2882         RESERVE_SPACE(12);
2883         if (nfserr) {
2884                 WRITE32(2);
2885                 WRITE32(0);
2886                 WRITE32(0);
2887         }
2888         else {
2889                 WRITE32(2);
2890                 WRITE32(setattr->sa_bmval[0]);
2891                 WRITE32(setattr->sa_bmval[1]);
2892         }
2893         ADJUST_ARGS();
2894         return nfserr;
2895 }
2896
2897 static __be32
2898 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2899 {
2900         __be32 *p;
2901
2902         if (!nfserr) {
2903                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2904                 WRITEMEM(&scd->se_clientid, 8);
2905                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2906                 ADJUST_ARGS();
2907         }
2908         else if (nfserr == nfserr_clid_inuse) {
2909                 RESERVE_SPACE(8);
2910                 WRITE32(0);
2911                 WRITE32(0);
2912                 ADJUST_ARGS();
2913         }
2914         return nfserr;
2915 }
2916
2917 static __be32
2918 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2919 {
2920         __be32 *p;
2921
2922         if (!nfserr) {
2923                 RESERVE_SPACE(16);
2924                 WRITE32(write->wr_bytes_written);
2925                 WRITE32(write->wr_how_written);
2926                 WRITEMEM(write->wr_verifier.data, 8);
2927                 ADJUST_ARGS();
2928         }
2929         return nfserr;
2930 }
2931
2932 static __be32
2933 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2934                          struct nfsd4_exchange_id *exid)
2935 {
2936         __be32 *p;
2937         char *major_id;
2938         char *server_scope;
2939         int major_id_sz;
2940         int server_scope_sz;
2941         uint64_t minor_id = 0;
2942
2943         if (nfserr)
2944                 return nfserr;
2945
2946         major_id = utsname()->nodename;
2947         major_id_sz = strlen(major_id);
2948         server_scope = utsname()->nodename;
2949         server_scope_sz = strlen(server_scope);
2950
2951         RESERVE_SPACE(
2952                 8 /* eir_clientid */ +
2953                 4 /* eir_sequenceid */ +
2954                 4 /* eir_flags */ +
2955                 4 /* spr_how (SP4_NONE) */ +
2956                 8 /* so_minor_id */ +
2957                 4 /* so_major_id.len */ +
2958                 (XDR_QUADLEN(major_id_sz) * 4) +
2959                 4 /* eir_server_scope.len */ +
2960                 (XDR_QUADLEN(server_scope_sz) * 4) +
2961                 4 /* eir_server_impl_id.count (0) */);
2962
2963         WRITEMEM(&exid->clientid, 8);
2964         WRITE32(exid->seqid);
2965         WRITE32(exid->flags);
2966
2967         /* state_protect4_r. Currently only support SP4_NONE */
2968         BUG_ON(exid->spa_how != SP4_NONE);
2969         WRITE32(exid->spa_how);
2970
2971         /* The server_owner struct */
2972         WRITE64(minor_id);      /* Minor id */
2973         /* major id */
2974         WRITE32(major_id_sz);
2975         WRITEMEM(major_id, major_id_sz);
2976
2977         /* Server scope */
2978         WRITE32(server_scope_sz);
2979         WRITEMEM(server_scope, server_scope_sz);
2980
2981         /* Implementation id */
2982         WRITE32(0);     /* zero length nfs_impl_id4 array */
2983         ADJUST_ARGS();
2984         return 0;
2985 }
2986
2987 static __be32
2988 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
2989                             struct nfsd4_create_session *sess)
2990 {
2991         __be32 *p;
2992
2993         if (nfserr)
2994                 return nfserr;
2995
2996         RESERVE_SPACE(24);
2997         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2998         WRITE32(sess->seqid);
2999         WRITE32(sess->flags);
3000         ADJUST_ARGS();
3001
3002         RESERVE_SPACE(28);
3003         WRITE32(0); /* headerpadsz */
3004         WRITE32(sess->fore_channel.maxreq_sz);
3005         WRITE32(sess->fore_channel.maxresp_sz);
3006         WRITE32(sess->fore_channel.maxresp_cached);
3007         WRITE32(sess->fore_channel.maxops);
3008         WRITE32(sess->fore_channel.maxreqs);
3009         WRITE32(sess->fore_channel.nr_rdma_attrs);
3010         ADJUST_ARGS();
3011
3012         if (sess->fore_channel.nr_rdma_attrs) {
3013                 RESERVE_SPACE(4);
3014                 WRITE32(sess->fore_channel.rdma_attrs);
3015                 ADJUST_ARGS();
3016         }
3017
3018         RESERVE_SPACE(28);
3019         WRITE32(0); /* headerpadsz */
3020         WRITE32(sess->back_channel.maxreq_sz);
3021         WRITE32(sess->back_channel.maxresp_sz);
3022         WRITE32(sess->back_channel.maxresp_cached);
3023         WRITE32(sess->back_channel.maxops);
3024         WRITE32(sess->back_channel.maxreqs);
3025         WRITE32(sess->back_channel.nr_rdma_attrs);
3026         ADJUST_ARGS();
3027
3028         if (sess->back_channel.nr_rdma_attrs) {
3029                 RESERVE_SPACE(4);
3030                 WRITE32(sess->back_channel.rdma_attrs);
3031                 ADJUST_ARGS();
3032         }
3033         return 0;
3034 }
3035
3036 static __be32
3037 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3038                              struct nfsd4_destroy_session *destroy_session)
3039 {
3040         return nfserr;
3041 }
3042
3043 __be32
3044 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3045                       struct nfsd4_sequence *seq)
3046 {
3047         __be32 *p;
3048
3049         if (nfserr)
3050                 return nfserr;
3051
3052         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3053         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3054         WRITE32(seq->seqid);
3055         WRITE32(seq->slotid);
3056         WRITE32(seq->maxslots);
3057         /*
3058          * FIXME: for now:
3059          *   target_maxslots = maxslots
3060          *   status_flags = 0
3061          */
3062         WRITE32(seq->maxslots);
3063         WRITE32(0);
3064
3065         ADJUST_ARGS();
3066         resp->cstate.datap = p; /* DRC cache data pointer */
3067         return 0;
3068 }
3069
3070 static __be32
3071 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3072 {
3073         return nfserr;
3074 }
3075
3076 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3077
3078 /*
3079  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3080  * since we don't need to filter out obsolete ops as this is
3081  * done in the decoding phase.
3082  */
3083 static nfsd4_enc nfsd4_enc_ops[] = {
3084         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3085         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3086         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3087         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3088         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3089         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3090         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3091         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3092         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3093         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3094         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3095         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3096         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3097         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3098         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3099         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3100         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3101         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3102         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3103         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3104         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3105         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3106         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3107         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3108         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3109         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3110         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3111         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3112         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3113         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3114         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3115         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3116         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3117         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3118         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3119         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3120         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3121
3122         /* NFSv4.1 operations */
3123         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3124         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3125         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3126         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3127         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3128         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3129         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3130         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3131         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3132         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3133         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3134         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3135         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
3136         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3137         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3138         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3139         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3140         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3141         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3142 };
3143
3144 /*
3145  * Calculate the total amount of memory that the compound response has taken
3146  * after encoding the current operation.
3147  *
3148  * pad: add on 8 bytes for the next operation's op_code and status so that
3149  * there is room to cache a failure on the next operation.
3150  *
3151  * Compare this length to the session se_fmaxresp_cached.
3152  *
3153  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3154  * will be at least a page and will therefore hold the xdr_buf head.
3155  */
3156 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3157 {
3158         int status = 0;
3159         struct xdr_buf *xb = &resp->rqstp->rq_res;
3160         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3161         struct nfsd4_session *session = NULL;
3162         struct nfsd4_slot *slot = resp->cstate.slot;
3163         u32 length, tlen = 0, pad = 8;
3164
3165         if (!nfsd4_has_session(&resp->cstate))
3166                 return status;
3167
3168         session = resp->cstate.session;
3169         if (session == NULL || slot->sl_cachethis == 0)
3170                 return status;
3171
3172         if (resp->opcnt >= args->opcnt)
3173                 pad = 0; /* this is the last operation */
3174
3175         if (xb->page_len == 0) {
3176                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3177         } else {
3178                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3179                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3180
3181                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3182         }
3183         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3184                 length, xb->page_len, tlen, pad);
3185
3186         if (length <= session->se_fchannel.maxresp_cached)
3187                 return status;
3188         else
3189                 return nfserr_rep_too_big_to_cache;
3190 }
3191
3192 void
3193 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3194 {
3195         __be32 *statp;
3196         __be32 *p;
3197
3198         RESERVE_SPACE(8);
3199         WRITE32(op->opnum);
3200         statp = p++;    /* to be backfilled at the end */
3201         ADJUST_ARGS();
3202
3203         if (op->opnum == OP_ILLEGAL)
3204                 goto status;
3205         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3206                !nfsd4_enc_ops[op->opnum]);
3207         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3208         /* nfsd4_check_drc_limit guarantees enough room for error status */
3209         if (!op->status && nfsd4_check_drc_limit(resp))
3210                 op->status = nfserr_rep_too_big_to_cache;
3211 status:
3212         /*
3213          * Note: We write the status directly, instead of using WRITE32(),
3214          * since it is already in network byte order.
3215          */
3216         *statp = op->status;
3217 }
3218
3219 /*
3220  * Encode the reply stored in the stateowner reply cache
3221  *
3222  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3223  * previously sent already encoded operation.
3224  *
3225  * called with nfs4_lock_state() held
3226  */
3227 void
3228 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3229 {
3230         __be32 *p;
3231         struct nfs4_replay *rp = op->replay;
3232
3233         BUG_ON(!rp);
3234
3235         RESERVE_SPACE(8);
3236         WRITE32(op->opnum);
3237         *p++ = rp->rp_status;  /* already xdr'ed */
3238         ADJUST_ARGS();
3239
3240         RESERVE_SPACE(rp->rp_buflen);
3241         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3242         ADJUST_ARGS();
3243 }
3244
3245 int
3246 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3247 {
3248         return xdr_ressize_check(rqstp, p);
3249 }
3250
3251 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3252 {
3253         if (args->ops != args->iops) {
3254                 kfree(args->ops);
3255                 args->ops = args->iops;
3256         }
3257         kfree(args->tmpp);
3258         args->tmpp = NULL;
3259         while (args->to_free) {
3260                 struct tmpbuf *tb = args->to_free;
3261                 args->to_free = tb->next;
3262                 tb->release(tb->buf);
3263                 kfree(tb);
3264         }
3265 }
3266
3267 int
3268 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3269 {
3270         __be32 status;
3271
3272         args->p = p;
3273         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3274         args->pagelist = rqstp->rq_arg.pages;
3275         args->pagelen = rqstp->rq_arg.page_len;
3276         args->tmpp = NULL;
3277         args->to_free = NULL;
3278         args->ops = args->iops;
3279         args->rqstp = rqstp;
3280
3281         status = nfsd4_decode_compound(args);
3282         if (status) {
3283                 nfsd4_release_compoundargs(args);
3284         }
3285         return !status;
3286 }
3287
3288 int
3289 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3290 {
3291         /*
3292          * All that remains is to write the tag and operation count...
3293          */
3294         struct nfsd4_compound_state *cs = &resp->cstate;
3295         struct kvec *iov;
3296         p = resp->tagp;
3297         *p++ = htonl(resp->taglen);
3298         memcpy(p, resp->tag, resp->taglen);
3299         p += XDR_QUADLEN(resp->taglen);
3300         *p++ = htonl(resp->opcnt);
3301
3302         if (rqstp->rq_res.page_len)
3303                 iov = &rqstp->rq_res.tail[0];
3304         else
3305                 iov = &rqstp->rq_res.head[0];
3306         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3307         BUG_ON(iov->iov_len > PAGE_SIZE);
3308         if (nfsd4_has_session(cs) && cs->status != nfserr_replay_cache) {
3309                 nfsd4_store_cache_entry(resp);
3310                 dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3311                 resp->cstate.slot->sl_inuse = false;
3312                 nfsd4_put_session(resp->cstate.session);
3313         }
3314         return 1;
3315 }
3316
3317 /*
3318  * Local variables:
3319  *  c-basic-offset: 8
3320  * End:
3321  */