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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/slab.h>
  44 #include <linux/namei.h>
  45 #include <linux/statfs.h>
  46 #include <linux/utsname.h>
  47 #include <linux/nfsd_idmap.h>
  48 #include <linux/nfs4_acl.h>
  49 #include <linux/sunrpc/svcauth_gss.h>
  50
  51 #include "xdr4.h"
  52 #include "vfs.h"
  53
  54 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  55
  56 /*
  57  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  58  * directory in order to indicate to the client that a filesystem boundary is present
  59  * We use a fixed fsid for a referral
  60  */
  61 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  62 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  63
  64 static __be32
  65 check_filename(char *str, int len, __be32 err)
  66 {
  67         int i;
  68
  69         if (len == 0)
  70                 return nfserr_inval;
  71         if (isdotent(str, len))
  72                 return err;
  73         for (i = 0; i < len; i++)
  74                 if (str[i] == '/')
  75                         return err;
  76         return 0;
  77 }
  78
  79 #define DECODE_HEAD                             \
  80         __be32 *p;                              \
  81         __be32 status
  82 #define DECODE_TAIL                             \
  83         status = 0;                             \
  84 out:                                            \
  85         return status;                          \
  86 xdr_error:                                      \
  87         dprintk("NFSD: xdr error (%s:%d)\n",    \
  88                         __FILE__, __LINE__);    \
  89         status = nfserr_bad_xdr;                \
  90         goto out
  91
  92 #define READ32(x)         (x) = ntohl(*p++)
  93 #define READ64(x)         do {                  \
  94         (x) = (u64)ntohl(*p++) << 32;           \
  95         (x) |= ntohl(*p++);                     \
  96 } while (0)
  97 #define READTIME(x)       do {                  \
  98         p++;                                    \
  99         (x) = ntohl(*p++);                      \
 100         p++;                                    \
 101 } while (0)
 102 #define READMEM(x,nbytes) do {                  \
 103         x = (char *)p;                          \
 104         p += XDR_QUADLEN(nbytes);               \
 105 } while (0)
 106 #define SAVEMEM(x,nbytes) do {                  \
 107         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 108                 savemem(argp, p, nbytes) :      \
 109                 (char *)p)) {                   \
 110                 dprintk("NFSD: xdr error (%s:%d)\n", \
 111                                 __FILE__, __LINE__); \
 112                 goto xdr_error;                 \
 113                 }                               \
 114         p += XDR_QUADLEN(nbytes);               \
 115 } while (0)
 116 #define COPYMEM(x,nbytes) do {                  \
 117         memcpy((x), p, nbytes);                 \
 118         p += XDR_QUADLEN(nbytes);               \
 119 } while (0)
 120
 121 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 122 #define READ_BUF(nbytes)  do {                  \
 123         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 124                 p = argp->p;                    \
 125                 argp->p += XDR_QUADLEN(nbytes); \
 126         } else if (!(p = read_buf(argp, nbytes))) { \
 127                 dprintk("NFSD: xdr error (%s:%d)\n", \
 128                                 __FILE__, __LINE__); \
 129                 goto xdr_error;                 \
 130         }                                       \
 131 } while (0)
 132
 133 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 134 {
 135         /* We want more bytes than seem to be available.
 136          * Maybe we need a new page, maybe we have just run out
 137          */
 138         unsigned int avail = (char *)argp->end - (char *)argp->p;
 139         __be32 *p;
 140         if (avail + argp->pagelen < nbytes)
 141                 return NULL;
 142         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 143                 return NULL;
 144         /* ok, we can do it with the current plus the next page */
 145         if (nbytes <= sizeof(argp->tmp))
 146                 p = argp->tmp;
 147         else {
 148                 kfree(argp->tmpp);
 149                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 150                 if (!p)
 151                         return NULL;
 152
 153         }
 154         /*
 155          * The following memcpy is safe because read_buf is always
 156          * called with nbytes > avail, and the two cases above both
 157          * guarantee p points to at least nbytes bytes.
 158          */
 159         memcpy(p, argp->p, avail);
 160         /* step to next page */
 161         argp->p = page_address(argp->pagelist[0]);
 162         argp->pagelist++;
 163         if (argp->pagelen < PAGE_SIZE) {
 164                 argp->end = argp->p + (argp->pagelen>>2);
 165                 argp->pagelen = 0;
 166         } else {
 167                 argp->end = argp->p + (PAGE_SIZE>>2);
 168                 argp->pagelen -= PAGE_SIZE;
 169         }
 170         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 171         argp->p += XDR_QUADLEN(nbytes - avail);
 172         return p;
 173 }
 174
 175 static int zero_clientid(clientid_t *clid)
 176 {
 177         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 178 }
 179
 180 static int
 181 defer_free(struct nfsd4_compoundargs *argp,
 182                 void (*release)(const void *), void *p)
 183 {
 184         struct tmpbuf *tb;
 185
 186         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 187         if (!tb)
 188                 return -ENOMEM;
 189         tb->buf = p;
 190         tb->release = release;
 191         tb->next = argp->to_free;
 192         argp->to_free = tb;
 193         return 0;
 194 }
 195
 196 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 197 {
 198         if (p == argp->tmp) {
 199                 p = kmalloc(nbytes, GFP_KERNEL);
 200                 if (!p)
 201                         return NULL;
 202                 memcpy(p, argp->tmp, nbytes);
 203         } else {
 204                 BUG_ON(p != argp->tmpp);
 205                 argp->tmpp = NULL;
 206         }
 207         if (defer_free(argp, kfree, p)) {
 208                 kfree(p);
 209                 return NULL;
 210         } else
 211                 return (char *)p;
 212 }
 213
 214 static __be32
 215 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 216 {
 217         u32 bmlen;
 218         DECODE_HEAD;
 219
 220         bmval[0] = 0;
 221         bmval[1] = 0;
 222         bmval[2] = 0;
 223
 224         READ_BUF(4);
 225         READ32(bmlen);
 226         if (bmlen > 1000)
 227                 goto xdr_error;
 228
 229         READ_BUF(bmlen << 2);
 230         if (bmlen > 0)
 231                 READ32(bmval[0]);
 232         if (bmlen > 1)
 233                 READ32(bmval[1]);
 234         if (bmlen > 2)
 235                 READ32(bmval[2]);
 236
 237         DECODE_TAIL;
 238 }
 239
 240 static __be32
 241 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 242                    struct iattr *iattr, struct nfs4_acl **acl)
 243 {
 244         int expected_len, len = 0;
 245         u32 dummy32;
 246         char *buf;
 247         int host_err;
 248
 249         DECODE_HEAD;
 250         iattr->ia_valid = 0;
 251         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 252                 return status;
 253
 254         READ_BUF(4);
 255         READ32(expected_len);
 256
 257         if (bmval[0] & FATTR4_WORD0_SIZE) {
 258                 READ_BUF(8);
 259                 len += 8;
 260                 READ64(iattr->ia_size);
 261                 iattr->ia_valid |= ATTR_SIZE;
 262         }
 263         if (bmval[0] & FATTR4_WORD0_ACL) {
 264                 int nace;
 265                 struct nfs4_ace *ace;
 266
 267                 READ_BUF(4); len += 4;
 268                 READ32(nace);
 269
 270                 if (nace > NFS4_ACL_MAX)
 271                         return nfserr_resource;
 272
 273                 *acl = nfs4_acl_new(nace);
 274                 if (*acl == NULL) {
 275                         host_err = -ENOMEM;
 276                         goto out_nfserr;
 277                 }
 278                 defer_free(argp, kfree, *acl);
 279
 280                 (*acl)->naces = nace;
 281                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 282                         READ_BUF(16); len += 16;
 283                         READ32(ace->type);
 284                         READ32(ace->flag);
 285                         READ32(ace->access_mask);
 286                         READ32(dummy32);
 287                         READ_BUF(dummy32);
 288                         len += XDR_QUADLEN(dummy32) << 2;
 289                         READMEM(buf, dummy32);
 290                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 291                         host_err = 0;
 292                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 293                                 ace->who = 0;
 294                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 295                                 host_err = nfsd_map_name_to_gid(argp->rqstp,
 296                                                 buf, dummy32, &ace->who);
 297                         else
 298                                 host_err = nfsd_map_name_to_uid(argp->rqstp,
 299                                                 buf, dummy32, &ace->who);
 300                         if (host_err)
 301                                 goto out_nfserr;
 302                 }
 303         } else
 304                 *acl = NULL;
 305         if (bmval[1] & FATTR4_WORD1_MODE) {
 306                 READ_BUF(4);
 307                 len += 4;
 308                 READ32(iattr->ia_mode);
 309                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 310                 iattr->ia_valid |= ATTR_MODE;
 311         }
 312         if (bmval[1] & FATTR4_WORD1_OWNER) {
 313                 READ_BUF(4);
 314                 len += 4;
 315                 READ32(dummy32);
 316                 READ_BUF(dummy32);
 317                 len += (XDR_QUADLEN(dummy32) << 2);
 318                 READMEM(buf, dummy32);
 319                 if ((host_err = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 320                         goto out_nfserr;
 321                 iattr->ia_valid |= ATTR_UID;
 322         }
 323         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 324                 READ_BUF(4);
 325                 len += 4;
 326                 READ32(dummy32);
 327                 READ_BUF(dummy32);
 328                 len += (XDR_QUADLEN(dummy32) << 2);
 329                 READMEM(buf, dummy32);
 330                 if ((host_err = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 331                         goto out_nfserr;
 332                 iattr->ia_valid |= ATTR_GID;
 333         }
 334         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 335                 READ_BUF(4);
 336                 len += 4;
 337                 READ32(dummy32);
 338                 switch (dummy32) {
 339                 case NFS4_SET_TO_CLIENT_TIME:
 340                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 341                            all 32 bits of 'nseconds'. */
 342                         READ_BUF(12);
 343                         len += 12;
 344                         READ32(dummy32);
 345                         if (dummy32)
 346                                 return nfserr_inval;
 347                         READ32(iattr->ia_atime.tv_sec);
 348                         READ32(iattr->ia_atime.tv_nsec);
 349                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 350                                 return nfserr_inval;
 351                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 352                         break;
 353                 case NFS4_SET_TO_SERVER_TIME:
 354                         iattr->ia_valid |= ATTR_ATIME;
 355                         break;
 356                 default:
 357                         goto xdr_error;
 358                 }
 359         }
 360         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 361                 READ_BUF(4);
 362                 len += 4;
 363                 READ32(dummy32);
 364                 switch (dummy32) {
 365                 case NFS4_SET_TO_CLIENT_TIME:
 366                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 367                            all 32 bits of 'nseconds'. */
 368                         READ_BUF(12);
 369                         len += 12;
 370                         READ32(dummy32);
 371                         if (dummy32)
 372                                 return nfserr_inval;
 373                         READ32(iattr->ia_mtime.tv_sec);
 374                         READ32(iattr->ia_mtime.tv_nsec);
 375                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 376                                 return nfserr_inval;
 377                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 378                         break;
 379                 case NFS4_SET_TO_SERVER_TIME:
 380                         iattr->ia_valid |= ATTR_MTIME;
 381                         break;
 382                 default:
 383                         goto xdr_error;
 384                 }
 385         }
 386         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 387             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 388             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 389                 READ_BUF(expected_len - len);
 390         else if (len != expected_len)
 391                 goto xdr_error;
 392
 393         DECODE_TAIL;
 394
 395 out_nfserr:
 396         status = nfserrno(host_err);
 397         goto out;
 398 }
 399
 400 static __be32
 401 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 402 {
 403         DECODE_HEAD;
 404
 405         READ_BUF(sizeof(stateid_t));
 406         READ32(sid->si_generation);
 407         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 408
 409         DECODE_TAIL;
 410 }
 411
 412 static __be32
 413 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 414 {
 415         DECODE_HEAD;
 416
 417         READ_BUF(4);
 418         READ32(access->ac_req_access);
 419
 420         DECODE_TAIL;
 421 }
 422
 423 static __be32
 424 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 425 {
 426         DECODE_HEAD;
 427
 428         close->cl_stateowner = NULL;
 429         READ_BUF(4);
 430         READ32(close->cl_seqid);
 431         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 432
 433         DECODE_TAIL;
 434 }
 435
 436
 437 static __be32
 438 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 439 {
 440         DECODE_HEAD;
 441
 442         READ_BUF(12);
 443         READ64(commit->co_offset);
 444         READ32(commit->co_count);
 445
 446         DECODE_TAIL;
 447 }
 448
 449 static __be32
 450 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 451 {
 452         DECODE_HEAD;
 453
 454         READ_BUF(4);
 455         READ32(create->cr_type);
 456         switch (create->cr_type) {
 457         case NF4LNK:
 458                 READ_BUF(4);
 459                 READ32(create->cr_linklen);
 460                 READ_BUF(create->cr_linklen);
 461                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 462                 break;
 463         case NF4BLK:
 464         case NF4CHR:
 465                 READ_BUF(8);
 466                 READ32(create->cr_specdata1);
 467                 READ32(create->cr_specdata2);
 468                 break;
 469         case NF4SOCK:
 470         case NF4FIFO:
 471         case NF4DIR:
 472         default:
 473                 break;
 474         }
 475
 476         READ_BUF(4);
 477         READ32(create->cr_namelen);
 478         READ_BUF(create->cr_namelen);
 479         SAVEMEM(create->cr_name, create->cr_namelen);
 480         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 481                 return status;
 482
 483         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 484                                     &create->cr_acl);
 485         if (status)
 486                 goto out;
 487
 488         DECODE_TAIL;
 489 }
 490
 491 static inline __be32
 492 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 493 {
 494         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 495 }
 496
 497 static inline __be32
 498 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 499 {
 500         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 501 }
 502
 503 static __be32
 504 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 505 {
 506         DECODE_HEAD;
 507
 508         READ_BUF(4);
 509         READ32(link->li_namelen);
 510         READ_BUF(link->li_namelen);
 511         SAVEMEM(link->li_name, link->li_namelen);
 512         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 513                 return status;
 514
 515         DECODE_TAIL;
 516 }
 517
 518 static __be32
 519 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 520 {
 521         DECODE_HEAD;
 522
 523         lock->lk_replay_owner = NULL;
 524         /*
 525         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 526         */
 527         READ_BUF(28);
 528         READ32(lock->lk_type);
 529         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 530                 goto xdr_error;
 531         READ32(lock->lk_reclaim);
 532         READ64(lock->lk_offset);
 533         READ64(lock->lk_length);
 534         READ32(lock->lk_is_new);
 535
 536         if (lock->lk_is_new) {
 537                 READ_BUF(4);
 538                 READ32(lock->lk_new_open_seqid);
 539                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 540                 if (status)
 541                         return status;
 542                 READ_BUF(8 + sizeof(clientid_t));
 543                 READ32(lock->lk_new_lock_seqid);
 544                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 545                 READ32(lock->lk_new_owner.len);
 546                 READ_BUF(lock->lk_new_owner.len);
 547                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 548         } else {
 549                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 550                 if (status)
 551                         return status;
 552                 READ_BUF(4);
 553                 READ32(lock->lk_old_lock_seqid);
 554         }
 555
 556         DECODE_TAIL;
 557 }
 558
 559 static __be32
 560 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 561 {
 562         DECODE_HEAD;
 563
 564         READ_BUF(32);
 565         READ32(lockt->lt_type);
 566         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 567                 goto xdr_error;
 568         READ64(lockt->lt_offset);
 569         READ64(lockt->lt_length);
 570         COPYMEM(&lockt->lt_clientid, 8);
 571         READ32(lockt->lt_owner.len);
 572         READ_BUF(lockt->lt_owner.len);
 573         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 574
 575         if (argp->minorversion && !zero_clientid(&lockt->lt_clientid))
 576                 return nfserr_inval;
 577         DECODE_TAIL;
 578 }
 579
 580 static __be32
 581 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 582 {
 583         DECODE_HEAD;
 584
 585         locku->lu_stateowner = NULL;
 586         READ_BUF(8);
 587         READ32(locku->lu_type);
 588         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 589                 goto xdr_error;
 590         READ32(locku->lu_seqid);
 591         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 592         if (status)
 593                 return status;
 594         READ_BUF(16);
 595         READ64(locku->lu_offset);
 596         READ64(locku->lu_length);
 597
 598         DECODE_TAIL;
 599 }
 600
 601 static __be32
 602 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 603 {
 604         DECODE_HEAD;
 605
 606         READ_BUF(4);
 607         READ32(lookup->lo_len);
 608         READ_BUF(lookup->lo_len);
 609         SAVEMEM(lookup->lo_name, lookup->lo_len);
 610         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 611                 return status;
 612
 613         DECODE_TAIL;
 614 }
 615
 616 static __be32
 617 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 618 {
 619         DECODE_HEAD;
 620
 621         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 622         open->op_iattr.ia_valid = 0;
 623         open->op_stateowner = NULL;
 624
 625         /* seqid, share_access, share_deny, clientid, ownerlen */
 626         READ_BUF(16 + sizeof(clientid_t));
 627         READ32(open->op_seqid);
 628         READ32(open->op_share_access);
 629         READ32(open->op_share_deny);
 630         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 631         READ32(open->op_owner.len);
 632
 633         /* owner, open_flag */
 634         READ_BUF(open->op_owner.len + 4);
 635         SAVEMEM(open->op_owner.data, open->op_owner.len);
 636         READ32(open->op_create);
 637         switch (open->op_create) {
 638         case NFS4_OPEN_NOCREATE:
 639                 break;
 640         case NFS4_OPEN_CREATE:
 641                 READ_BUF(4);
 642                 READ32(open->op_createmode);
 643                 switch (open->op_createmode) {
 644                 case NFS4_CREATE_UNCHECKED:
 645                 case NFS4_CREATE_GUARDED:
 646                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 647                                 &open->op_iattr, &open->op_acl);
 648                         if (status)
 649                                 goto out;
 650                         break;
 651                 case NFS4_CREATE_EXCLUSIVE:
 652                         READ_BUF(8);
 653                         COPYMEM(open->op_verf.data, 8);
 654                         break;
 655                 case NFS4_CREATE_EXCLUSIVE4_1:
 656                         if (argp->minorversion < 1)
 657                                 goto xdr_error;
 658                         READ_BUF(8);
 659                         COPYMEM(open->op_verf.data, 8);
 660                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 661                                 &open->op_iattr, &open->op_acl);
 662                         if (status)
 663                                 goto out;
 664                         break;
 665                 default:
 666                         goto xdr_error;
 667                 }
 668                 break;
 669         default:
 670                 goto xdr_error;
 671         }
 672
 673         /* open_claim */
 674         READ_BUF(4);
 675         READ32(open->op_claim_type);
 676         switch (open->op_claim_type) {
 677         case NFS4_OPEN_CLAIM_NULL:
 678         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 679                 READ_BUF(4);
 680                 READ32(open->op_fname.len);
 681                 READ_BUF(open->op_fname.len);
 682                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 683                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 684                         return status;
 685                 break;
 686         case NFS4_OPEN_CLAIM_PREVIOUS:
 687                 READ_BUF(4);
 688                 READ32(open->op_delegate_type);
 689                 break;
 690         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 691                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 692                 if (status)
 693                         return status;
 694                 READ_BUF(4);
 695                 READ32(open->op_fname.len);
 696                 READ_BUF(open->op_fname.len);
 697                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 698                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 699                         return status;
 700                 break;
 701         default:
 702                 goto xdr_error;
 703         }
 704
 705         DECODE_TAIL;
 706 }
 707
 708 static __be32
 709 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 710 {
 711         DECODE_HEAD;
 712
 713         open_conf->oc_stateowner = NULL;
 714         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 715         if (status)
 716                 return status;
 717         READ_BUF(4);
 718         READ32(open_conf->oc_seqid);
 719
 720         DECODE_TAIL;
 721 }
 722
 723 static __be32
 724 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 725 {
 726         DECODE_HEAD;
 727
 728         open_down->od_stateowner = NULL;
 729         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 730         if (status)
 731                 return status;
 732         READ_BUF(12);
 733         READ32(open_down->od_seqid);
 734         READ32(open_down->od_share_access);
 735         READ32(open_down->od_share_deny);
 736
 737         DECODE_TAIL;
 738 }
 739
 740 static __be32
 741 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 742 {
 743         DECODE_HEAD;
 744
 745         READ_BUF(4);
 746         READ32(putfh->pf_fhlen);
 747         if (putfh->pf_fhlen > NFS4_FHSIZE)
 748                 goto xdr_error;
 749         READ_BUF(putfh->pf_fhlen);
 750         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 751
 752         DECODE_TAIL;
 753 }
 754
 755 static __be32
 756 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 757 {
 758         DECODE_HEAD;
 759
 760         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 761         if (status)
 762                 return status;
 763         READ_BUF(12);
 764         READ64(read->rd_offset);
 765         READ32(read->rd_length);
 766
 767         DECODE_TAIL;
 768 }
 769
 770 static __be32
 771 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 772 {
 773         DECODE_HEAD;
 774
 775         READ_BUF(24);
 776         READ64(readdir->rd_cookie);
 777         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 778         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 779         READ32(readdir->rd_maxcount);
 780         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 781                 goto out;
 782
 783         DECODE_TAIL;
 784 }
 785
 786 static __be32
 787 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 788 {
 789         DECODE_HEAD;
 790
 791         READ_BUF(4);
 792         READ32(remove->rm_namelen);
 793         READ_BUF(remove->rm_namelen);
 794         SAVEMEM(remove->rm_name, remove->rm_namelen);
 795         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 796                 return status;
 797
 798         DECODE_TAIL;
 799 }
 800
 801 static __be32
 802 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 803 {
 804         DECODE_HEAD;
 805
 806         READ_BUF(4);
 807         READ32(rename->rn_snamelen);
 808         READ_BUF(rename->rn_snamelen + 4);
 809         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 810         READ32(rename->rn_tnamelen);
 811         READ_BUF(rename->rn_tnamelen);
 812         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 813         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 814                 return status;
 815         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 816                 return status;
 817
 818         DECODE_TAIL;
 819 }
 820
 821 static __be32
 822 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 823 {
 824         DECODE_HEAD;
 825
 826         READ_BUF(sizeof(clientid_t));
 827         COPYMEM(clientid, sizeof(clientid_t));
 828
 829         DECODE_TAIL;
 830 }
 831
 832 static __be32
 833 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 834                      struct nfsd4_secinfo *secinfo)
 835 {
 836         DECODE_HEAD;
 837
 838         READ_BUF(4);
 839         READ32(secinfo->si_namelen);
 840         READ_BUF(secinfo->si_namelen);
 841         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 842         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 843                                                                 nfserr_noent);
 844         if (status)
 845                 return status;
 846         DECODE_TAIL;
 847 }
 848
 849 static __be32
 850 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 851 {
 852         __be32 status;
 853
 854         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 855         if (status)
 856                 return status;
 857         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 858                                   &setattr->sa_acl);
 859 }
 860
 861 static __be32
 862 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 863 {
 864         DECODE_HEAD;
 865
 866         READ_BUF(12);
 867         COPYMEM(setclientid->se_verf.data, 8);
 868         READ32(setclientid->se_namelen);
 869
 870         READ_BUF(setclientid->se_namelen + 8);
 871         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 872         READ32(setclientid->se_callback_prog);
 873         READ32(setclientid->se_callback_netid_len);
 874
 875         READ_BUF(setclientid->se_callback_netid_len + 4);
 876         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 877         READ32(setclientid->se_callback_addr_len);
 878
 879         READ_BUF(setclientid->se_callback_addr_len + 4);
 880         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 881         READ32(setclientid->se_callback_ident);
 882
 883         DECODE_TAIL;
 884 }
 885
 886 static __be32
 887 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 888 {
 889         DECODE_HEAD;
 890
 891         READ_BUF(8 + sizeof(nfs4_verifier));
 892         COPYMEM(&scd_c->sc_clientid, 8);
 893         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 894
 895         DECODE_TAIL;
 896 }
 897
 898 /* Also used for NVERIFY */
 899 static __be32
 900 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 901 {
 902 #if 0
 903         struct nfsd4_compoundargs save = {
 904                 .p = argp->p,
 905                 .end = argp->end,
 906                 .rqstp = argp->rqstp,
 907         };
 908         u32             ve_bmval[2];
 909         struct iattr    ve_iattr;           /* request */
 910         struct nfs4_acl *ve_acl;            /* request */
 911 #endif
 912         DECODE_HEAD;
 913
 914         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 915                 goto out;
 916
 917         /* For convenience's sake, we compare raw xdr'd attributes in
 918          * nfsd4_proc_verify; however we still decode here just to return
 919          * correct error in case of bad xdr. */
 920 #if 0
 921         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 922         if (status == nfserr_inval) {
 923                 status = nfserrno(status);
 924                 goto out;
 925         }
 926 #endif
 927         READ_BUF(4);
 928         READ32(verify->ve_attrlen);
 929         READ_BUF(verify->ve_attrlen);
 930         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 931
 932         DECODE_TAIL;
 933 }
 934
 935 static __be32
 936 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 937 {
 938         int avail;
 939         int v;
 940         int len;
 941         DECODE_HEAD;
 942
 943         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 944         if (status)
 945                 return status;
 946         READ_BUF(16);
 947         READ64(write->wr_offset);
 948         READ32(write->wr_stable_how);
 949         if (write->wr_stable_how > 2)
 950                 goto xdr_error;
 951         READ32(write->wr_buflen);
 952
 953         /* Sorry .. no magic macros for this.. *
 954          * READ_BUF(write->wr_buflen);
 955          * SAVEMEM(write->wr_buf, write->wr_buflen);
 956          */
 957         avail = (char*)argp->end - (char*)argp->p;
 958         if (avail + argp->pagelen < write->wr_buflen) {
 959                 dprintk("NFSD: xdr error (%s:%d)\n",
 960                                 __FILE__, __LINE__);
 961                 goto xdr_error;
 962         }
 963         argp->rqstp->rq_vec[0].iov_base = p;
 964         argp->rqstp->rq_vec[0].iov_len = avail;
 965         v = 0;
 966         len = write->wr_buflen;
 967         while (len > argp->rqstp->rq_vec[v].iov_len) {
 968                 len -= argp->rqstp->rq_vec[v].iov_len;
 969                 v++;
 970                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 971                 argp->pagelist++;
 972                 if (argp->pagelen >= PAGE_SIZE) {
 973                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 974                         argp->pagelen -= PAGE_SIZE;
 975                 } else {
 976                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 977                         argp->pagelen -= len;
 978                 }
 979         }
 980         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
 981         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
 982         argp->rqstp->rq_vec[v].iov_len = len;
 983         write->wr_vlen = v+1;
 984
 985         DECODE_TAIL;
 986 }
 987
 988 static __be32
 989 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
 990 {
 991         DECODE_HEAD;
 992
 993         READ_BUF(12);
 994         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
 995         READ32(rlockowner->rl_owner.len);
 996         READ_BUF(rlockowner->rl_owner.len);
 997         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
 998
 999         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1000                 return nfserr_inval;
1001         DECODE_TAIL;
1002 }
1003
1004 static __be32
1005 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1006                          struct nfsd4_exchange_id *exid)
1007 {
1008         int dummy;
1009         DECODE_HEAD;
1010
1011         READ_BUF(NFS4_VERIFIER_SIZE);
1012         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1013
1014         READ_BUF(4);
1015         READ32(exid->clname.len);
1016
1017         READ_BUF(exid->clname.len);
1018         SAVEMEM(exid->clname.data, exid->clname.len);
1019
1020         READ_BUF(4);
1021         READ32(exid->flags);
1022
1023         /* Ignore state_protect4_a */
1024         READ_BUF(4);
1025         READ32(exid->spa_how);
1026         switch (exid->spa_how) {
1027         case SP4_NONE:
1028                 break;
1029         case SP4_MACH_CRED:
1030                 /* spo_must_enforce */
1031                 READ_BUF(4);
1032                 READ32(dummy);
1033                 READ_BUF(dummy * 4);
1034                 p += dummy;
1035
1036                 /* spo_must_allow */
1037                 READ_BUF(4);
1038                 READ32(dummy);
1039                 READ_BUF(dummy * 4);
1040                 p += dummy;
1041                 break;
1042         case SP4_SSV:
1043                 /* ssp_ops */
1044                 READ_BUF(4);
1045                 READ32(dummy);
1046                 READ_BUF(dummy * 4);
1047                 p += dummy;
1048
1049                 READ_BUF(4);
1050                 READ32(dummy);
1051                 READ_BUF(dummy * 4);
1052                 p += dummy;
1053
1054                 /* ssp_hash_algs<> */
1055                 READ_BUF(4);
1056                 READ32(dummy);
1057                 READ_BUF(dummy);
1058                 p += XDR_QUADLEN(dummy);
1059
1060                 /* ssp_encr_algs<> */
1061                 READ_BUF(4);
1062                 READ32(dummy);
1063                 READ_BUF(dummy);
1064                 p += XDR_QUADLEN(dummy);
1065
1066                 /* ssp_window and ssp_num_gss_handles */
1067                 READ_BUF(8);
1068                 READ32(dummy);
1069                 READ32(dummy);
1070                 break;
1071         default:
1072                 goto xdr_error;
1073         }
1074
1075         /* Ignore Implementation ID */
1076         READ_BUF(4);    /* nfs_impl_id4 array length */
1077         READ32(dummy);
1078
1079         if (dummy > 1)
1080                 goto xdr_error;
1081
1082         if (dummy == 1) {
1083                 /* nii_domain */
1084                 READ_BUF(4);
1085                 READ32(dummy);
1086                 READ_BUF(dummy);
1087                 p += XDR_QUADLEN(dummy);
1088
1089                 /* nii_name */
1090                 READ_BUF(4);
1091                 READ32(dummy);
1092                 READ_BUF(dummy);
1093                 p += XDR_QUADLEN(dummy);
1094
1095                 /* nii_date */
1096                 READ_BUF(12);
1097                 p += 3;
1098         }
1099         DECODE_TAIL;
1100 }
1101
1102 static __be32
1103 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1104                             struct nfsd4_create_session *sess)
1105 {
1106         DECODE_HEAD;
1107
1108         u32 dummy;
1109         char *machine_name;
1110         int i;
1111         int nr_secflavs;
1112
1113         READ_BUF(16);
1114         COPYMEM(&sess->clientid, 8);
1115         READ32(sess->seqid);
1116         READ32(sess->flags);
1117
1118         /* Fore channel attrs */
1119         READ_BUF(28);
1120         READ32(dummy); /* headerpadsz is always 0 */
1121         READ32(sess->fore_channel.maxreq_sz);
1122         READ32(sess->fore_channel.maxresp_sz);
1123         READ32(sess->fore_channel.maxresp_cached);
1124         READ32(sess->fore_channel.maxops);
1125         READ32(sess->fore_channel.maxreqs);
1126         READ32(sess->fore_channel.nr_rdma_attrs);
1127         if (sess->fore_channel.nr_rdma_attrs == 1) {
1128                 READ_BUF(4);
1129                 READ32(sess->fore_channel.rdma_attrs);
1130         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1131                 dprintk("Too many fore channel attr bitmaps!\n");
1132                 goto xdr_error;
1133         }
1134
1135         /* Back channel attrs */
1136         READ_BUF(28);
1137         READ32(dummy); /* headerpadsz is always 0 */
1138         READ32(sess->back_channel.maxreq_sz);
1139         READ32(sess->back_channel.maxresp_sz);
1140         READ32(sess->back_channel.maxresp_cached);
1141         READ32(sess->back_channel.maxops);
1142         READ32(sess->back_channel.maxreqs);
1143         READ32(sess->back_channel.nr_rdma_attrs);
1144         if (sess->back_channel.nr_rdma_attrs == 1) {
1145                 READ_BUF(4);
1146                 READ32(sess->back_channel.rdma_attrs);
1147         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1148                 dprintk("Too many back channel attr bitmaps!\n");
1149                 goto xdr_error;
1150         }
1151
1152         READ_BUF(8);
1153         READ32(sess->callback_prog);
1154
1155         /* callback_sec_params4 */
1156         READ32(nr_secflavs);
1157         for (i = 0; i < nr_secflavs; ++i) {
1158                 READ_BUF(4);
1159                 READ32(dummy);
1160                 switch (dummy) {
1161                 case RPC_AUTH_NULL:
1162                         /* Nothing to read */
1163                         break;
1164                 case RPC_AUTH_UNIX:
1165                         READ_BUF(8);
1166                         /* stamp */
1167                         READ32(dummy);
1168
1169                         /* machine name */
1170                         READ32(dummy);
1171                         READ_BUF(dummy);
1172                         SAVEMEM(machine_name, dummy);
1173
1174                         /* uid, gid */
1175                         READ_BUF(8);
1176                         READ32(sess->uid);
1177                         READ32(sess->gid);
1178
1179                         /* more gids */
1180                         READ_BUF(4);
1181                         READ32(dummy);
1182                         READ_BUF(dummy * 4);
1183                         for (i = 0; i < dummy; ++i)
1184                                 READ32(dummy);
1185                         break;
1186                 case RPC_AUTH_GSS:
1187                         dprintk("RPC_AUTH_GSS callback secflavor "
1188                                 "not supported!\n");
1189                         READ_BUF(8);
1190                         /* gcbp_service */
1191                         READ32(dummy);
1192                         /* gcbp_handle_from_server */
1193                         READ32(dummy);
1194                         READ_BUF(dummy);
1195                         p += XDR_QUADLEN(dummy);
1196                         /* gcbp_handle_from_client */
1197                         READ_BUF(4);
1198                         READ32(dummy);
1199                         READ_BUF(dummy);
1200                         p += XDR_QUADLEN(dummy);
1201                         break;
1202                 default:
1203                         dprintk("Illegal callback secflavor\n");
1204                         return nfserr_inval;
1205                 }
1206         }
1207         DECODE_TAIL;
1208 }
1209
1210 static __be32
1211 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1212                              struct nfsd4_destroy_session *destroy_session)
1213 {
1214         DECODE_HEAD;
1215         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1216         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1217
1218         DECODE_TAIL;
1219 }
1220
1221 static __be32
1222 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1223                       struct nfsd4_sequence *seq)
1224 {
1225         DECODE_HEAD;
1226
1227         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1228         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1229         READ32(seq->seqid);
1230         READ32(seq->slotid);
1231         READ32(seq->maxslots);
1232         READ32(seq->cachethis);
1233
1234         DECODE_TAIL;
1235 }
1236
1237 static __be32
1238 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1239 {
1240         return nfs_ok;
1241 }
1242
1243 static __be32
1244 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1245 {
1246         return nfserr_notsupp;
1247 }
1248
1249 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1250
1251 static nfsd4_dec nfsd4_dec_ops[] = {
1252         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1253         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1254         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1255         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1256         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1257         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1258         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1259         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1260         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1261         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1262         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1263         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1264         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1265         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1266         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1267         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1268         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1269         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1270         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1271         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1272         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1273         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1274         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1275         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1276         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1277         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1278         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1279         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1280         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1281         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1282         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1283         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1284         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1285         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1286         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1287         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1288         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1289 };
1290
1291 static nfsd4_dec nfsd41_dec_ops[] = {
1292         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1293         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1294         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1295         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1296         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1297         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1298         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1299         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1300         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1301         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1302         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1303         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1304         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1305         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1306         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1307         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1308         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1309         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1310         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1311         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1312         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1313         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1314         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1315         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1316         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1317         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1318         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1319         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1320         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1321         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1322         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1323         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1324         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1325         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1326         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1327         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1328         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1329
1330         /* new operations for NFSv4.1 */
1331         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1332         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_notsupp,
1333         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1334         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1335         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1336         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1337         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1338         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1339         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1340         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1341         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1342         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1343         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_notsupp,
1344         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1345         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1346         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1347         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1348         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_notsupp,
1349         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_notsupp,
1350 };
1351
1352 struct nfsd4_minorversion_ops {
1353         nfsd4_dec *decoders;
1354         int nops;
1355 };
1356
1357 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1358         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1359         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1360 };
1361
1362 static __be32
1363 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1364 {
1365         DECODE_HEAD;
1366         struct nfsd4_op *op;
1367         struct nfsd4_minorversion_ops *ops;
1368         int i;
1369
1370         /*
1371          * XXX: According to spec, we should check the tag
1372          * for UTF-8 compliance.  I'm postponing this for
1373          * now because it seems that some clients do use
1374          * binary tags.
1375          */
1376         READ_BUF(4);
1377         READ32(argp->taglen);
1378         READ_BUF(argp->taglen + 8);
1379         SAVEMEM(argp->tag, argp->taglen);
1380         READ32(argp->minorversion);
1381         READ32(argp->opcnt);
1382
1383         if (argp->taglen > NFSD4_MAX_TAGLEN)
1384                 goto xdr_error;
1385         if (argp->opcnt > 100)
1386                 goto xdr_error;
1387
1388         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1389                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1390                 if (!argp->ops) {
1391                         argp->ops = argp->iops;
1392                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1393                         goto xdr_error;
1394                 }
1395         }
1396
1397         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1398                 argp->opcnt = 0;
1399
1400         ops = &nfsd4_minorversion[argp->minorversion];
1401         for (i = 0; i < argp->opcnt; i++) {
1402                 op = &argp->ops[i];
1403                 op->replay = NULL;
1404
1405                 /*
1406                  * We can't use READ_BUF() here because we need to handle
1407                  * a missing opcode as an OP_WRITE + 1. So we need to check
1408                  * to see if we're truly at the end of our buffer or if there
1409                  * is another page we need to flip to.
1410                  */
1411
1412                 if (argp->p == argp->end) {
1413                         if (argp->pagelen < 4) {
1414                                 /* There isn't an opcode still on the wire */
1415                                 op->opnum = OP_WRITE + 1;
1416                                 op->status = nfserr_bad_xdr;
1417                                 argp->opcnt = i+1;
1418                                 break;
1419                         }
1420
1421                         /*
1422                          * False alarm. We just hit a page boundary, but there
1423                          * is still data available.  Move pointer across page
1424                          * boundary.  *snip from READ_BUF*
1425                          */
1426                         argp->p = page_address(argp->pagelist[0]);
1427                         argp->pagelist++;
1428                         if (argp->pagelen < PAGE_SIZE) {
1429                                 argp->end = argp->p + (argp->pagelen>>2);
1430                                 argp->pagelen = 0;
1431                         } else {
1432                                 argp->end = argp->p + (PAGE_SIZE>>2);
1433                                 argp->pagelen -= PAGE_SIZE;
1434                         }
1435                 }
1436                 op->opnum = ntohl(*argp->p++);
1437
1438                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1439                         op->status = ops->decoders[op->opnum](argp, &op->u);
1440                 else {
1441                         op->opnum = OP_ILLEGAL;
1442                         op->status = nfserr_op_illegal;
1443                 }
1444
1445                 if (op->status) {
1446                         argp->opcnt = i+1;
1447                         break;
1448                 }
1449         }
1450
1451         DECODE_TAIL;
1452 }
1453
1454 #define WRITE32(n)               *p++ = htonl(n)
1455 #define WRITE64(n)               do {                           \
1456         *p++ = htonl((u32)((n) >> 32));                         \
1457         *p++ = htonl((u32)(n));                                 \
1458 } while (0)
1459 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1460         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1461         memcpy(p, ptr, nbytes);                                 \
1462         p += XDR_QUADLEN(nbytes);                               \
1463 }} while (0)
1464
1465 static void write32(__be32 **p, u32 n)
1466 {
1467         *(*p)++ = n;
1468 }
1469
1470 static void write64(__be32 **p, u64 n)
1471 {
1472         write32(p, (u32)(n >> 32));
1473         write32(p, (u32)n);
1474 }
1475
1476 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1477 {
1478         if (IS_I_VERSION(inode)) {
1479                 write64(p, inode->i_version);
1480         } else {
1481                 write32(p, stat->ctime.tv_sec);
1482                 write32(p, stat->ctime.tv_nsec);
1483         }
1484 }
1485
1486 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1487 {
1488         write32(p, c->atomic);
1489         if (c->change_supported) {
1490                 write64(p, c->before_change);
1491                 write64(p, c->after_change);
1492         } else {
1493                 write32(p, c->before_ctime_sec);
1494                 write32(p, c->before_ctime_nsec);
1495                 write32(p, c->after_ctime_sec);
1496                 write32(p, c->after_ctime_nsec);
1497         }
1498 }
1499
1500 #define RESERVE_SPACE(nbytes)   do {                            \
1501         p = resp->p;                                            \
1502         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1503 } while (0)
1504 #define ADJUST_ARGS()           resp->p = p
1505
1506 /*
1507  * Header routine to setup seqid operation replay cache
1508  */
1509 #define ENCODE_SEQID_OP_HEAD                                    \
1510         __be32 *save;                                           \
1511                                                                 \
1512         save = resp->p;
1513
1514 /*
1515  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1516  * is where sequence id's are incremented, and the replay cache is filled.
1517  * Note that we increment sequence id's here, at the last moment, so we're sure
1518  * we know whether the error to be returned is a sequence id mutating error.
1519  */
1520
1521 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1522         if (seqid_mutating_err(nfserr) && stateowner) {         \
1523                 stateowner->so_seqid++;                         \
1524                 stateowner->so_replay.rp_status = nfserr;       \
1525                 stateowner->so_replay.rp_buflen =               \
1526                           (((char *)(resp)->p - (char *)save)); \
1527                 memcpy(stateowner->so_replay.rp_buf, save,      \
1528                         stateowner->so_replay.rp_buflen);       \
1529         } } while (0);
1530
1531 /* Encode as an array of strings the string given with components
1532  * separated @sep.
1533  */
1534 static __be32 nfsd4_encode_components(char sep, char *components,
1535                                    __be32 **pp, int *buflen)
1536 {
1537         __be32 *p = *pp;
1538         __be32 *countp = p;
1539         int strlen, count=0;
1540         char *str, *end;
1541
1542         dprintk("nfsd4_encode_components(%s)\n", components);
1543         if ((*buflen -= 4) < 0)
1544                 return nfserr_resource;
1545         WRITE32(0); /* We will fill this in with @count later */
1546         end = str = components;
1547         while (*end) {
1548                 for (; *end && (*end != sep); end++)
1549                         ; /* Point to end of component */
1550                 strlen = end - str;
1551                 if (strlen) {
1552                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1553                                 return nfserr_resource;
1554                         WRITE32(strlen);
1555                         WRITEMEM(str, strlen);
1556                         count++;
1557                 }
1558                 else
1559                         end++;
1560                 str = end;
1561         }
1562         *pp = p;
1563         p = countp;
1564         WRITE32(count);
1565         return 0;
1566 }
1567
1568 /*
1569  * encode a location element of a fs_locations structure
1570  */
1571 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1572                                     __be32 **pp, int *buflen)
1573 {
1574         __be32 status;
1575         __be32 *p = *pp;
1576
1577         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1578         if (status)
1579                 return status;
1580         status = nfsd4_encode_components('/', location->path, &p, buflen);
1581         if (status)
1582                 return status;
1583         *pp = p;
1584         return 0;
1585 }
1586
1587 /*
1588  * Return the path to an export point in the pseudo filesystem namespace
1589  * Returned string is safe to use as long as the caller holds a reference
1590  * to @exp.
1591  */
1592 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1593 {
1594         struct svc_fh tmp_fh;
1595         char *path = NULL, *rootpath;
1596         size_t rootlen;
1597
1598         fh_init(&tmp_fh, NFS4_FHSIZE);
1599         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1600         if (*stat)
1601                 return NULL;
1602         rootpath = tmp_fh.fh_export->ex_pathname;
1603
1604         path = exp->ex_pathname;
1605
1606         rootlen = strlen(rootpath);
1607         if (strncmp(path, rootpath, rootlen)) {
1608                 dprintk("nfsd: fs_locations failed;"
1609                         "%s is not contained in %s\n", path, rootpath);
1610                 *stat = nfserr_notsupp;
1611                 path = NULL;
1612                 goto out;
1613         }
1614         path += rootlen;
1615 out:
1616         fh_put(&tmp_fh);
1617         return path;
1618 }
1619
1620 /*
1621  *  encode a fs_locations structure
1622  */
1623 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1624                                      struct svc_export *exp,
1625                                      __be32 **pp, int *buflen)
1626 {
1627         __be32 status;
1628         int i;
1629         __be32 *p = *pp;
1630         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1631         char *root = nfsd4_path(rqstp, exp, &status);
1632
1633         if (status)
1634                 return status;
1635         status = nfsd4_encode_components('/', root, &p, buflen);
1636         if (status)
1637                 return status;
1638         if ((*buflen -= 4) < 0)
1639                 return nfserr_resource;
1640         WRITE32(fslocs->locations_count);
1641         for (i=0; i<fslocs->locations_count; i++) {
1642                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1643                                                    &p, buflen);
1644                 if (status)
1645                         return status;
1646         }
1647         *pp = p;
1648         return 0;
1649 }
1650
1651 static u32 nfs4_ftypes[16] = {
1652         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1653         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1654         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1655         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1656 };
1657
1658 static __be32
1659 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1660                         __be32 **p, int *buflen)
1661 {
1662         int status;
1663
1664         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1665                 return nfserr_resource;
1666         if (whotype != NFS4_ACL_WHO_NAMED)
1667                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1668         else if (group)
1669                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1670         else
1671                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1672         if (status < 0)
1673                 return nfserrno(status);
1674         *p = xdr_encode_opaque(*p, NULL, status);
1675         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1676         BUG_ON(*buflen < 0);
1677         return 0;
1678 }
1679
1680 static inline __be32
1681 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1682 {
1683         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1684 }
1685
1686 static inline __be32
1687 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1688 {
1689         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1690 }
1691
1692 static inline __be32
1693 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1694                 __be32 **p, int *buflen)
1695 {
1696         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1697 }
1698
1699 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1700                               FATTR4_WORD0_RDATTR_ERROR)
1701 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1702
1703 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1704 {
1705         /* As per referral draft:  */
1706         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1707             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1708                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1709                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1710                         *rdattr_err = NFSERR_MOVED;
1711                 else
1712                         return nfserr_moved;
1713         }
1714         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1715         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1716         return 0;
1717 }
1718
1719 /*
1720  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1721  * ourselves.
1722  *
1723  * @countp is the buffer size in _words_; upon successful return this becomes
1724  * replaced with the number of words written.
1725  */
1726 __be32
1727 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1728                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1729                 struct svc_rqst *rqstp, int ignore_crossmnt)
1730 {
1731         u32 bmval0 = bmval[0];
1732         u32 bmval1 = bmval[1];
1733         u32 bmval2 = bmval[2];
1734         struct kstat stat;
1735         struct svc_fh tempfh;
1736         struct kstatfs statfs;
1737         int buflen = *countp << 2;
1738         __be32 *attrlenp;
1739         u32 dummy;
1740         u64 dummy64;
1741         u32 rdattr_err = 0;
1742         __be32 *p = buffer;
1743         __be32 status;
1744         int err;
1745         int aclsupport = 0;
1746         struct nfs4_acl *acl = NULL;
1747         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1748         u32 minorversion = resp->cstate.minorversion;
1749
1750         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1751         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1752         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1753         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1754
1755         if (exp->ex_fslocs.migrated) {
1756                 BUG_ON(bmval[2]);
1757                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1758                 if (status)
1759                         goto out;
1760         }
1761
1762         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1763         if (err)
1764                 goto out_nfserr;
1765         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1766                         FATTR4_WORD0_MAXNAME)) ||
1767             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1768                        FATTR4_WORD1_SPACE_TOTAL))) {
1769                 err = vfs_statfs(dentry, &statfs);
1770                 if (err)
1771                         goto out_nfserr;
1772         }
1773         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1774                 fh_init(&tempfh, NFS4_FHSIZE);
1775                 status = fh_compose(&tempfh, exp, dentry, NULL);
1776                 if (status)
1777                         goto out;
1778                 fhp = &tempfh;
1779         }
1780         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1781                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1782                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1783                 aclsupport = (err == 0);
1784                 if (bmval0 & FATTR4_WORD0_ACL) {
1785                         if (err == -EOPNOTSUPP)
1786                                 bmval0 &= ~FATTR4_WORD0_ACL;
1787                         else if (err == -EINVAL) {
1788                                 status = nfserr_attrnotsupp;
1789                                 goto out;
1790                         } else if (err != 0)
1791                                 goto out_nfserr;
1792                 }
1793         }
1794         if ((buflen -= 16) < 0)
1795                 goto out_resource;
1796
1797         if (unlikely(bmval2)) {
1798                 WRITE32(3);
1799                 WRITE32(bmval0);
1800                 WRITE32(bmval1);
1801                 WRITE32(bmval2);
1802         } else if (likely(bmval1)) {
1803                 WRITE32(2);
1804                 WRITE32(bmval0);
1805                 WRITE32(bmval1);
1806         } else {
1807                 WRITE32(1);
1808                 WRITE32(bmval0);
1809         }
1810         attrlenp = p++;                /* to be backfilled later */
1811
1812         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1813                 u32 word0 = nfsd_suppattrs0(minorversion);
1814                 u32 word1 = nfsd_suppattrs1(minorversion);
1815                 u32 word2 = nfsd_suppattrs2(minorversion);
1816
1817                 if ((buflen -= 12) < 0)
1818                         goto out_resource;
1819                 if (!aclsupport)
1820                         word0 &= ~FATTR4_WORD0_ACL;
1821                 if (!word2) {
1822                         WRITE32(2);
1823                         WRITE32(word0);
1824                         WRITE32(word1);
1825                 } else {
1826                         WRITE32(3);
1827                         WRITE32(word0);
1828                         WRITE32(word1);
1829                         WRITE32(word2);
1830                 }
1831         }
1832         if (bmval0 & FATTR4_WORD0_TYPE) {
1833                 if ((buflen -= 4) < 0)
1834                         goto out_resource;
1835                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1836                 if (dummy == NF4BAD)
1837                         goto out_serverfault;
1838                 WRITE32(dummy);
1839         }
1840         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1841                 if ((buflen -= 4) < 0)
1842                         goto out_resource;
1843                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1844                         WRITE32(NFS4_FH_PERSISTENT);
1845                 else
1846                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1847         }
1848         if (bmval0 & FATTR4_WORD0_CHANGE) {
1849                 if ((buflen -= 8) < 0)
1850                         goto out_resource;
1851                 write_change(&p, &stat, dentry->d_inode);
1852         }
1853         if (bmval0 & FATTR4_WORD0_SIZE) {
1854                 if ((buflen -= 8) < 0)
1855                         goto out_resource;
1856                 WRITE64(stat.size);
1857         }
1858         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1859                 if ((buflen -= 4) < 0)
1860                         goto out_resource;
1861                 WRITE32(1);
1862         }
1863         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1864                 if ((buflen -= 4) < 0)
1865                         goto out_resource;
1866                 WRITE32(1);
1867         }
1868         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1869                 if ((buflen -= 4) < 0)
1870                         goto out_resource;
1871                 WRITE32(0);
1872         }
1873         if (bmval0 & FATTR4_WORD0_FSID) {
1874                 if ((buflen -= 16) < 0)
1875                         goto out_resource;
1876                 if (exp->ex_fslocs.migrated) {
1877                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1878                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1879                 } else switch(fsid_source(fhp)) {
1880                 case FSIDSOURCE_FSID:
1881                         WRITE64((u64)exp->ex_fsid);
1882                         WRITE64((u64)0);
1883                         break;
1884                 case FSIDSOURCE_DEV:
1885                         WRITE32(0);
1886                         WRITE32(MAJOR(stat.dev));
1887                         WRITE32(0);
1888                         WRITE32(MINOR(stat.dev));
1889                         break;
1890                 case FSIDSOURCE_UUID:
1891                         WRITEMEM(exp->ex_uuid, 16);
1892                         break;
1893                 }
1894         }
1895         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1896                 if ((buflen -= 4) < 0)
1897                         goto out_resource;
1898                 WRITE32(0);
1899         }
1900         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1901                 if ((buflen -= 4) < 0)
1902                         goto out_resource;
1903                 WRITE32(nfsd4_lease);
1904         }
1905         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1906                 if ((buflen -= 4) < 0)
1907                         goto out_resource;
1908                 WRITE32(rdattr_err);
1909         }
1910         if (bmval0 & FATTR4_WORD0_ACL) {
1911                 struct nfs4_ace *ace;
1912
1913                 if (acl == NULL) {
1914                         if ((buflen -= 4) < 0)
1915                                 goto out_resource;
1916
1917                         WRITE32(0);
1918                         goto out_acl;
1919                 }
1920                 if ((buflen -= 4) < 0)
1921                         goto out_resource;
1922                 WRITE32(acl->naces);
1923
1924                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1925                         if ((buflen -= 4*3) < 0)
1926                                 goto out_resource;
1927                         WRITE32(ace->type);
1928                         WRITE32(ace->flag);
1929                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1930                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1931                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1932                                 &p, &buflen);
1933                         if (status == nfserr_resource)
1934                                 goto out_resource;
1935                         if (status)
1936                                 goto out;
1937                 }
1938         }
1939 out_acl:
1940         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1941                 if ((buflen -= 4) < 0)
1942                         goto out_resource;
1943                 WRITE32(aclsupport ?
1944                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1945         }
1946         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1947                 if ((buflen -= 4) < 0)
1948                         goto out_resource;
1949                 WRITE32(1);
1950         }
1951         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1952                 if ((buflen -= 4) < 0)
1953                         goto out_resource;
1954                 WRITE32(1);
1955         }
1956         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
1957                 if ((buflen -= 4) < 0)
1958                         goto out_resource;
1959                 WRITE32(1);
1960         }
1961         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
1962                 if ((buflen -= 4) < 0)
1963                         goto out_resource;
1964                 WRITE32(1);
1965         }
1966         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
1967                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
1968                 if (buflen < 0)
1969                         goto out_resource;
1970                 WRITE32(fhp->fh_handle.fh_size);
1971                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
1972         }
1973         if (bmval0 & FATTR4_WORD0_FILEID) {
1974                 if ((buflen -= 8) < 0)
1975                         goto out_resource;
1976                 WRITE64(stat.ino);
1977         }
1978         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
1979                 if ((buflen -= 8) < 0)
1980                         goto out_resource;
1981                 WRITE64((u64) statfs.f_ffree);
1982         }
1983         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
1984                 if ((buflen -= 8) < 0)
1985                         goto out_resource;
1986                 WRITE64((u64) statfs.f_ffree);
1987         }
1988         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
1989                 if ((buflen -= 8) < 0)
1990                         goto out_resource;
1991                 WRITE64((u64) statfs.f_files);
1992         }
1993         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
1994                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
1995                 if (status == nfserr_resource)
1996                         goto out_resource;
1997                 if (status)
1998                         goto out;
1999         }
2000         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2001                 if ((buflen -= 4) < 0)
2002                         goto out_resource;
2003                 WRITE32(1);
2004         }
2005         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2006                 if ((buflen -= 8) < 0)
2007                         goto out_resource;
2008                 WRITE64(~(u64)0);
2009         }
2010         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2011                 if ((buflen -= 4) < 0)
2012                         goto out_resource;
2013                 WRITE32(255);
2014         }
2015         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2016                 if ((buflen -= 4) < 0)
2017                         goto out_resource;
2018                 WRITE32(statfs.f_namelen);
2019         }
2020         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2021                 if ((buflen -= 8) < 0)
2022                         goto out_resource;
2023                 WRITE64((u64) svc_max_payload(rqstp));
2024         }
2025         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2026                 if ((buflen -= 8) < 0)
2027                         goto out_resource;
2028                 WRITE64((u64) svc_max_payload(rqstp));
2029         }
2030         if (bmval1 & FATTR4_WORD1_MODE) {
2031                 if ((buflen -= 4) < 0)
2032                         goto out_resource;
2033                 WRITE32(stat.mode & S_IALLUGO);
2034         }
2035         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2036                 if ((buflen -= 4) < 0)
2037                         goto out_resource;
2038                 WRITE32(1);
2039         }
2040         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2041                 if ((buflen -= 4) < 0)
2042                         goto out_resource;
2043                 WRITE32(stat.nlink);
2044         }
2045         if (bmval1 & FATTR4_WORD1_OWNER) {
2046                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2047                 if (status == nfserr_resource)
2048                         goto out_resource;
2049                 if (status)
2050                         goto out;
2051         }
2052         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2053                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2054                 if (status == nfserr_resource)
2055                         goto out_resource;
2056                 if (status)
2057                         goto out;
2058         }
2059         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2060                 if ((buflen -= 8) < 0)
2061                         goto out_resource;
2062                 WRITE32((u32) MAJOR(stat.rdev));
2063                 WRITE32((u32) MINOR(stat.rdev));
2064         }
2065         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2066                 if ((buflen -= 8) < 0)
2067                         goto out_resource;
2068                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2069                 WRITE64(dummy64);
2070         }
2071         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2072                 if ((buflen -= 8) < 0)
2073                         goto out_resource;
2074                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2075                 WRITE64(dummy64);
2076         }
2077         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2078                 if ((buflen -= 8) < 0)
2079                         goto out_resource;
2080                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2081                 WRITE64(dummy64);
2082         }
2083         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2084                 if ((buflen -= 8) < 0)
2085                         goto out_resource;
2086                 dummy64 = (u64)stat.blocks << 9;
2087                 WRITE64(dummy64);
2088         }
2089         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2090                 if ((buflen -= 12) < 0)
2091                         goto out_resource;
2092                 WRITE32(0);
2093                 WRITE32(stat.atime.tv_sec);
2094                 WRITE32(stat.atime.tv_nsec);
2095         }
2096         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2097                 if ((buflen -= 12) < 0)
2098                         goto out_resource;
2099                 WRITE32(0);
2100                 WRITE32(1);
2101                 WRITE32(0);
2102         }
2103         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2104                 if ((buflen -= 12) < 0)
2105                         goto out_resource;
2106                 WRITE32(0);
2107                 WRITE32(stat.ctime.tv_sec);
2108                 WRITE32(stat.ctime.tv_nsec);
2109         }
2110         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2111                 if ((buflen -= 12) < 0)
2112                         goto out_resource;
2113                 WRITE32(0);
2114                 WRITE32(stat.mtime.tv_sec);
2115                 WRITE32(stat.mtime.tv_nsec);
2116         }
2117         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2118                 if ((buflen -= 8) < 0)
2119                         goto out_resource;
2120                 /*
2121                  * Get parent's attributes if not ignoring crossmount
2122                  * and this is the root of a cross-mounted filesystem.
2123                  */
2124                 if (ignore_crossmnt == 0 &&
2125                     dentry == exp->ex_path.mnt->mnt_root) {
2126                         struct path path = exp->ex_path;
2127                         path_get(&path);
2128                         while (follow_up(&path)) {
2129                                 if (path.dentry != path.mnt->mnt_root)
2130                                         break;
2131                         }
2132                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2133                         path_put(&path);
2134                         if (err)
2135                                 goto out_nfserr;
2136                 }
2137                 WRITE64(stat.ino);
2138         }
2139         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2140                 WRITE32(3);
2141                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2142                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2143                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2144         }
2145
2146         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2147         *countp = p - buffer;
2148         status = nfs_ok;
2149
2150 out:
2151         kfree(acl);
2152         if (fhp == &tempfh)
2153                 fh_put(&tempfh);
2154         return status;
2155 out_nfserr:
2156         status = nfserrno(err);
2157         goto out;
2158 out_resource:
2159         *countp = 0;
2160         status = nfserr_resource;
2161         goto out;
2162 out_serverfault:
2163         status = nfserr_serverfault;
2164         goto out;
2165 }
2166
2167 static inline int attributes_need_mount(u32 *bmval)
2168 {
2169         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2170                 return 1;
2171         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2172                 return 1;
2173         return 0;
2174 }
2175
2176 static __be32
2177 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2178                 const char *name, int namlen, __be32 *p, int *buflen)
2179 {
2180         struct svc_export *exp = cd->rd_fhp->fh_export;
2181         struct dentry *dentry;
2182         __be32 nfserr;
2183         int ignore_crossmnt = 0;
2184
2185         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2186         if (IS_ERR(dentry))
2187                 return nfserrno(PTR_ERR(dentry));
2188         if (!dentry->d_inode) {
2189                 /*
2190                  * nfsd_buffered_readdir drops the i_mutex between
2191                  * readdir and calling this callback, leaving a window
2192                  * where this directory entry could have gone away.
2193                  */
2194                 dput(dentry);
2195                 return nfserr_noent;
2196         }
2197
2198         exp_get(exp);
2199         /*
2200          * In the case of a mountpoint, the client may be asking for
2201          * attributes that are only properties of the underlying filesystem
2202          * as opposed to the cross-mounted file system. In such a case,
2203          * we will not follow the cross mount and will fill the attribtutes
2204          * directly from the mountpoint dentry.
2205          */
2206         if (nfsd_mountpoint(dentry, exp)) {
2207                 int err;
2208
2209                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2210                                 && !attributes_need_mount(cd->rd_bmval)) {
2211                         ignore_crossmnt = 1;
2212                         goto out_encode;
2213                 }
2214                 /*
2215                  * Why the heck aren't we just using nfsd_lookup??
2216                  * Different "."/".." handling?  Something else?
2217                  * At least, add a comment here to explain....
2218                  */
2219                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2220                 if (err) {
2221                         nfserr = nfserrno(err);
2222                         goto out_put;
2223                 }
2224                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2225                 if (nfserr)
2226                         goto out_put;
2227
2228         }
2229 out_encode:
2230         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2231                                         cd->rd_rqstp, ignore_crossmnt);
2232 out_put:
2233         dput(dentry);
2234         exp_put(exp);
2235         return nfserr;
2236 }
2237
2238 static __be32 *
2239 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2240 {
2241         __be32 *attrlenp;
2242
2243         if (buflen < 6)
2244                 return NULL;
2245         *p++ = htonl(2);
2246         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2247         *p++ = htonl(0);                         /* bmval1 */
2248
2249         attrlenp = p++;
2250         *p++ = nfserr;       /* no htonl */
2251         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2252         return p;
2253 }
2254
2255 static int
2256 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2257                     loff_t offset, u64 ino, unsigned int d_type)
2258 {
2259         struct readdir_cd *ccd = ccdv;
2260         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2261         int buflen;
2262         __be32 *p = cd->buffer;
2263         __be32 *cookiep;
2264         __be32 nfserr = nfserr_toosmall;
2265
2266         /* In nfsv4, "." and ".." never make it onto the wire.. */
2267         if (name && isdotent(name, namlen)) {
2268                 cd->common.err = nfs_ok;
2269                 return 0;
2270         }
2271
2272         if (cd->offset)
2273                 xdr_encode_hyper(cd->offset, (u64) offset);
2274
2275         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2276         if (buflen < 0)
2277                 goto fail;
2278
2279         *p++ = xdr_one;                             /* mark entry present */
2280         cookiep = p;
2281         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2282         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2283
2284         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2285         switch (nfserr) {
2286         case nfs_ok:
2287                 p += buflen;
2288                 break;
2289         case nfserr_resource:
2290                 nfserr = nfserr_toosmall;
2291                 goto fail;
2292         case nfserr_dropit:
2293                 goto fail;
2294         case nfserr_noent:
2295                 goto skip_entry;
2296         default:
2297                 /*
2298                  * If the client requested the RDATTR_ERROR attribute,
2299                  * we stuff the error code into this attribute
2300                  * and continue.  If this attribute was not requested,
2301                  * then in accordance with the spec, we fail the
2302                  * entire READDIR operation(!)
2303                  */
2304                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2305                         goto fail;
2306                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2307                 if (p == NULL) {
2308                         nfserr = nfserr_toosmall;
2309                         goto fail;
2310                 }
2311         }
2312         cd->buflen -= (p - cd->buffer);
2313         cd->buffer = p;
2314         cd->offset = cookiep;
2315 skip_entry:
2316         cd->common.err = nfs_ok;
2317         return 0;
2318 fail:
2319         cd->common.err = nfserr;
2320         return -EINVAL;
2321 }
2322
2323 static void
2324 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2325 {
2326         __be32 *p;
2327
2328         RESERVE_SPACE(sizeof(stateid_t));
2329         WRITE32(sid->si_generation);
2330         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2331         ADJUST_ARGS();
2332 }
2333
2334 static __be32
2335 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2336 {
2337         __be32 *p;
2338
2339         if (!nfserr) {
2340                 RESERVE_SPACE(8);
2341                 WRITE32(access->ac_supported);
2342                 WRITE32(access->ac_resp_access);
2343                 ADJUST_ARGS();
2344         }
2345         return nfserr;
2346 }
2347
2348 static __be32
2349 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2350 {
2351         ENCODE_SEQID_OP_HEAD;
2352
2353         if (!nfserr)
2354                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2355
2356         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2357         return nfserr;
2358 }
2359
2360
2361 static __be32
2362 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2363 {
2364         __be32 *p;
2365
2366         if (!nfserr) {
2367                 RESERVE_SPACE(8);
2368                 WRITEMEM(commit->co_verf.data, 8);
2369                 ADJUST_ARGS();
2370         }
2371         return nfserr;
2372 }
2373
2374 static __be32
2375 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2376 {
2377         __be32 *p;
2378
2379         if (!nfserr) {
2380                 RESERVE_SPACE(32);
2381                 write_cinfo(&p, &create->cr_cinfo);
2382                 WRITE32(2);
2383                 WRITE32(create->cr_bmval[0]);
2384                 WRITE32(create->cr_bmval[1]);
2385                 ADJUST_ARGS();
2386         }
2387         return nfserr;
2388 }
2389
2390 static __be32
2391 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2392 {
2393         struct svc_fh *fhp = getattr->ga_fhp;
2394         int buflen;
2395
2396         if (nfserr)
2397                 return nfserr;
2398
2399         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2400         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2401                                     resp->p, &buflen, getattr->ga_bmval,
2402                                     resp->rqstp, 0);
2403         if (!nfserr)
2404                 resp->p += buflen;
2405         return nfserr;
2406 }
2407
2408 static __be32
2409 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2410 {
2411         struct svc_fh *fhp = *fhpp;
2412         unsigned int len;
2413         __be32 *p;
2414
2415         if (!nfserr) {
2416                 len = fhp->fh_handle.fh_size;
2417                 RESERVE_SPACE(len + 4);
2418                 WRITE32(len);
2419                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2420                 ADJUST_ARGS();
2421         }
2422         return nfserr;
2423 }
2424
2425 /*
2426 * Including all fields other than the name, a LOCK4denied structure requires
2427 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2428 */
2429 static void
2430 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2431 {
2432         __be32 *p;
2433
2434         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2435         WRITE64(ld->ld_start);
2436         WRITE64(ld->ld_length);
2437         WRITE32(ld->ld_type);
2438         if (ld->ld_sop) {
2439                 WRITEMEM(&ld->ld_clientid, 8);
2440                 WRITE32(ld->ld_sop->so_owner.len);
2441                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2442                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2443         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2444                 WRITE64((u64)0); /* clientid */
2445                 WRITE32(0); /* length of owner name */
2446         }
2447         ADJUST_ARGS();
2448 }
2449
2450 static __be32
2451 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2452 {
2453         ENCODE_SEQID_OP_HEAD;
2454
2455         if (!nfserr)
2456                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2457         else if (nfserr == nfserr_denied)
2458                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2459
2460         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2461         return nfserr;
2462 }
2463
2464 static __be32
2465 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2466 {
2467         if (nfserr == nfserr_denied)
2468                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2469         return nfserr;
2470 }
2471
2472 static __be32
2473 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2474 {
2475         ENCODE_SEQID_OP_HEAD;
2476
2477         if (!nfserr)
2478                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2479
2480         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2481         return nfserr;
2482 }
2483
2484
2485 static __be32
2486 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2487 {
2488         __be32 *p;
2489
2490         if (!nfserr) {
2491                 RESERVE_SPACE(20);
2492                 write_cinfo(&p, &link->li_cinfo);
2493                 ADJUST_ARGS();
2494         }
2495         return nfserr;
2496 }
2497
2498
2499 static __be32
2500 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2501 {
2502         __be32 *p;
2503         ENCODE_SEQID_OP_HEAD;
2504
2505         if (nfserr)
2506                 goto out;
2507
2508         nfsd4_encode_stateid(resp, &open->op_stateid);
2509         RESERVE_SPACE(40);
2510         write_cinfo(&p, &open->op_cinfo);
2511         WRITE32(open->op_rflags);
2512         WRITE32(2);
2513         WRITE32(open->op_bmval[0]);
2514         WRITE32(open->op_bmval[1]);
2515         WRITE32(open->op_delegate_type);
2516         ADJUST_ARGS();
2517
2518         switch (open->op_delegate_type) {
2519         case NFS4_OPEN_DELEGATE_NONE:
2520                 break;
2521         case NFS4_OPEN_DELEGATE_READ:
2522                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2523                 RESERVE_SPACE(20);
2524                 WRITE32(open->op_recall);
2525
2526                 /*
2527                  * TODO: ACE's in delegations
2528                  */
2529                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2530                 WRITE32(0);
2531                 WRITE32(0);
2532                 WRITE32(0);   /* XXX: is NULL principal ok? */
2533                 ADJUST_ARGS();
2534                 break;
2535         case NFS4_OPEN_DELEGATE_WRITE:
2536                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2537                 RESERVE_SPACE(32);
2538                 WRITE32(0);
2539
2540                 /*
2541                  * TODO: space_limit's in delegations
2542                  */
2543                 WRITE32(NFS4_LIMIT_SIZE);
2544                 WRITE32(~(u32)0);
2545                 WRITE32(~(u32)0);
2546
2547                 /*
2548                  * TODO: ACE's in delegations
2549                  */
2550                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2551                 WRITE32(0);
2552                 WRITE32(0);
2553                 WRITE32(0);   /* XXX: is NULL principal ok? */
2554                 ADJUST_ARGS();
2555                 break;
2556         default:
2557                 BUG();
2558         }
2559         /* XXX save filehandle here */
2560 out:
2561         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2562         return nfserr;
2563 }
2564
2565 static __be32
2566 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2567 {
2568         ENCODE_SEQID_OP_HEAD;
2569
2570         if (!nfserr)
2571                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2572
2573         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2574         return nfserr;
2575 }
2576
2577 static __be32
2578 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2579 {
2580         ENCODE_SEQID_OP_HEAD;
2581
2582         if (!nfserr)
2583                 nfsd4_encode_stateid(resp, &od->od_stateid);
2584
2585         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2586         return nfserr;
2587 }
2588
2589 static __be32
2590 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2591                   struct nfsd4_read *read)
2592 {
2593         u32 eof;
2594         int v, pn;
2595         unsigned long maxcount;
2596         long len;
2597         __be32 *p;
2598
2599         if (nfserr)
2600                 return nfserr;
2601         if (resp->xbuf->page_len)
2602                 return nfserr_resource;
2603
2604         RESERVE_SPACE(8); /* eof flag and byte count */
2605
2606         maxcount = svc_max_payload(resp->rqstp);
2607         if (maxcount > read->rd_length)
2608                 maxcount = read->rd_length;
2609
2610         len = maxcount;
2611         v = 0;
2612         while (len > 0) {
2613                 pn = resp->rqstp->rq_resused++;
2614                 resp->rqstp->rq_vec[v].iov_base =
2615                         page_address(resp->rqstp->rq_respages[pn]);
2616                 resp->rqstp->rq_vec[v].iov_len =
2617                         len < PAGE_SIZE ? len : PAGE_SIZE;
2618                 v++;
2619                 len -= PAGE_SIZE;
2620         }
2621         read->rd_vlen = v;
2622
2623         nfserr = nfsd_read(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2624                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2625                         &maxcount);
2626
2627         if (nfserr == nfserr_symlink)
2628                 nfserr = nfserr_inval;
2629         if (nfserr)
2630                 return nfserr;
2631         eof = (read->rd_offset + maxcount >=
2632                read->rd_fhp->fh_dentry->d_inode->i_size);
2633
2634         WRITE32(eof);
2635         WRITE32(maxcount);
2636         ADJUST_ARGS();
2637         resp->xbuf->head[0].iov_len = (char*)p
2638                                         - (char*)resp->xbuf->head[0].iov_base;
2639         resp->xbuf->page_len = maxcount;
2640
2641         /* Use rest of head for padding and remaining ops: */
2642         resp->xbuf->tail[0].iov_base = p;
2643         resp->xbuf->tail[0].iov_len = 0;
2644         if (maxcount&3) {
2645                 RESERVE_SPACE(4);
2646                 WRITE32(0);
2647                 resp->xbuf->tail[0].iov_base += maxcount&3;
2648                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2649                 ADJUST_ARGS();
2650         }
2651         return 0;
2652 }
2653
2654 static __be32
2655 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2656 {
2657         int maxcount;
2658         char *page;
2659         __be32 *p;
2660
2661         if (nfserr)
2662                 return nfserr;
2663         if (resp->xbuf->page_len)
2664                 return nfserr_resource;
2665
2666         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2667
2668         maxcount = PAGE_SIZE;
2669         RESERVE_SPACE(4);
2670
2671         /*
2672          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2673          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2674          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2675          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2676          */
2677         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2678         if (nfserr == nfserr_isdir)
2679                 return nfserr_inval;
2680         if (nfserr)
2681                 return nfserr;
2682
2683         WRITE32(maxcount);
2684         ADJUST_ARGS();
2685         resp->xbuf->head[0].iov_len = (char*)p
2686                                 - (char*)resp->xbuf->head[0].iov_base;
2687         resp->xbuf->page_len = maxcount;
2688
2689         /* Use rest of head for padding and remaining ops: */
2690         resp->xbuf->tail[0].iov_base = p;
2691         resp->xbuf->tail[0].iov_len = 0;
2692         if (maxcount&3) {
2693                 RESERVE_SPACE(4);
2694                 WRITE32(0);
2695                 resp->xbuf->tail[0].iov_base += maxcount&3;
2696                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2697                 ADJUST_ARGS();
2698         }
2699         return 0;
2700 }
2701
2702 static __be32
2703 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2704 {
2705         int maxcount;
2706         loff_t offset;
2707         __be32 *page, *savep, *tailbase;
2708         __be32 *p;
2709
2710         if (nfserr)
2711                 return nfserr;
2712         if (resp->xbuf->page_len)
2713                 return nfserr_resource;
2714
2715         RESERVE_SPACE(8);  /* verifier */
2716         savep = p;
2717
2718         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2719         WRITE32(0);
2720         WRITE32(0);
2721         ADJUST_ARGS();
2722         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2723         tailbase = p;
2724
2725         maxcount = PAGE_SIZE;
2726         if (maxcount > readdir->rd_maxcount)
2727                 maxcount = readdir->rd_maxcount;
2728
2729         /*
2730          * Convert from bytes to words, account for the two words already
2731          * written, make sure to leave two words at the end for the next
2732          * pointer and eof field.
2733          */
2734         maxcount = (maxcount >> 2) - 4;
2735         if (maxcount < 0) {
2736                 nfserr =  nfserr_toosmall;
2737                 goto err_no_verf;
2738         }
2739
2740         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2741         readdir->common.err = 0;
2742         readdir->buflen = maxcount;
2743         readdir->buffer = page;
2744         readdir->offset = NULL;
2745
2746         offset = readdir->rd_cookie;
2747         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2748                               &offset,
2749                               &readdir->common, nfsd4_encode_dirent);
2750         if (nfserr == nfs_ok &&
2751             readdir->common.err == nfserr_toosmall &&
2752             readdir->buffer == page)
2753                 nfserr = nfserr_toosmall;
2754         if (nfserr == nfserr_symlink)
2755                 nfserr = nfserr_notdir;
2756         if (nfserr)
2757                 goto err_no_verf;
2758
2759         if (readdir->offset)
2760                 xdr_encode_hyper(readdir->offset, offset);
2761
2762         p = readdir->buffer;
2763         *p++ = 0;       /* no more entries */
2764         *p++ = htonl(readdir->common.err == nfserr_eof);
2765         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2766                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2767
2768         /* Use rest of head for padding and remaining ops: */
2769         resp->xbuf->tail[0].iov_base = tailbase;
2770         resp->xbuf->tail[0].iov_len = 0;
2771         resp->p = resp->xbuf->tail[0].iov_base;
2772         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2773
2774         return 0;
2775 err_no_verf:
2776         p = savep;
2777         ADJUST_ARGS();
2778         return nfserr;
2779 }
2780
2781 static __be32
2782 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2783 {
2784         __be32 *p;
2785
2786         if (!nfserr) {
2787                 RESERVE_SPACE(20);
2788                 write_cinfo(&p, &remove->rm_cinfo);
2789                 ADJUST_ARGS();
2790         }
2791         return nfserr;
2792 }
2793
2794 static __be32
2795 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2796 {
2797         __be32 *p;
2798
2799         if (!nfserr) {
2800                 RESERVE_SPACE(40);
2801                 write_cinfo(&p, &rename->rn_sinfo);
2802                 write_cinfo(&p, &rename->rn_tinfo);
2803                 ADJUST_ARGS();
2804         }
2805         return nfserr;
2806 }
2807
2808 static __be32
2809 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2810                      struct nfsd4_secinfo *secinfo)
2811 {
2812         int i = 0;
2813         struct svc_export *exp = secinfo->si_exp;
2814         u32 nflavs;
2815         struct exp_flavor_info *flavs;
2816         struct exp_flavor_info def_flavs[2];
2817         __be32 *p;
2818
2819         if (nfserr)
2820                 goto out;
2821         if (exp->ex_nflavors) {
2822                 flavs = exp->ex_flavors;
2823                 nflavs = exp->ex_nflavors;
2824         } else { /* Handling of some defaults in absence of real secinfo: */
2825                 flavs = def_flavs;
2826                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2827                         nflavs = 2;
2828                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2829                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2830                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2831                         nflavs = 1;
2832                         flavs[0].pseudoflavor
2833                                         = svcauth_gss_flavor(exp->ex_client);
2834                 } else {
2835                         nflavs = 1;
2836                         flavs[0].pseudoflavor
2837                                         = exp->ex_client->flavour->flavour;
2838                 }
2839         }
2840
2841         RESERVE_SPACE(4);
2842         WRITE32(nflavs);
2843         ADJUST_ARGS();
2844         for (i = 0; i < nflavs; i++) {
2845                 u32 flav = flavs[i].pseudoflavor;
2846                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2847
2848                 if (gm) {
2849                         RESERVE_SPACE(4);
2850                         WRITE32(RPC_AUTH_GSS);
2851                         ADJUST_ARGS();
2852                         RESERVE_SPACE(4 + gm->gm_oid.len);
2853                         WRITE32(gm->gm_oid.len);
2854                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2855                         ADJUST_ARGS();
2856                         RESERVE_SPACE(4);
2857                         WRITE32(0); /* qop */
2858                         ADJUST_ARGS();
2859                         RESERVE_SPACE(4);
2860                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2861                         ADJUST_ARGS();
2862                         gss_mech_put(gm);
2863                 } else {
2864                         RESERVE_SPACE(4);
2865                         WRITE32(flav);
2866                         ADJUST_ARGS();
2867                 }
2868         }
2869 out:
2870         if (exp)
2871                 exp_put(exp);
2872         return nfserr;
2873 }
2874
2875 /*
2876  * The SETATTR encode routine is special -- it always encodes a bitmap,
2877  * regardless of the error status.
2878  */
2879 static __be32
2880 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2881 {
2882         __be32 *p;
2883
2884         RESERVE_SPACE(12);
2885         if (nfserr) {
2886                 WRITE32(2);
2887                 WRITE32(0);
2888                 WRITE32(0);
2889         }
2890         else {
2891                 WRITE32(2);
2892                 WRITE32(setattr->sa_bmval[0]);
2893                 WRITE32(setattr->sa_bmval[1]);
2894         }
2895         ADJUST_ARGS();
2896         return nfserr;
2897 }
2898
2899 static __be32
2900 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2901 {
2902         __be32 *p;
2903
2904         if (!nfserr) {
2905                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2906                 WRITEMEM(&scd->se_clientid, 8);
2907                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2908                 ADJUST_ARGS();
2909         }
2910         else if (nfserr == nfserr_clid_inuse) {
2911                 RESERVE_SPACE(8);
2912                 WRITE32(0);
2913                 WRITE32(0);
2914                 ADJUST_ARGS();
2915         }
2916         return nfserr;
2917 }
2918
2919 static __be32
2920 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2921 {
2922         __be32 *p;
2923
2924         if (!nfserr) {
2925                 RESERVE_SPACE(16);
2926                 WRITE32(write->wr_bytes_written);
2927                 WRITE32(write->wr_how_written);
2928                 WRITEMEM(write->wr_verifier.data, 8);
2929                 ADJUST_ARGS();
2930         }
2931         return nfserr;
2932 }
2933
2934 static __be32
2935 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
2936                          struct nfsd4_exchange_id *exid)
2937 {
2938         __be32 *p;
2939         char *major_id;
2940         char *server_scope;
2941         int major_id_sz;
2942         int server_scope_sz;
2943         uint64_t minor_id = 0;
2944
2945         if (nfserr)
2946                 return nfserr;
2947
2948         major_id = utsname()->nodename;
2949         major_id_sz = strlen(major_id);
2950         server_scope = utsname()->nodename;
2951         server_scope_sz = strlen(server_scope);
2952
2953         RESERVE_SPACE(
2954                 8 /* eir_clientid */ +
2955                 4 /* eir_sequenceid */ +
2956                 4 /* eir_flags */ +
2957                 4 /* spr_how (SP4_NONE) */ +
2958                 8 /* so_minor_id */ +
2959                 4 /* so_major_id.len */ +
2960                 (XDR_QUADLEN(major_id_sz) * 4) +
2961                 4 /* eir_server_scope.len */ +
2962                 (XDR_QUADLEN(server_scope_sz) * 4) +
2963                 4 /* eir_server_impl_id.count (0) */);
2964
2965         WRITEMEM(&exid->clientid, 8);
2966         WRITE32(exid->seqid);
2967         WRITE32(exid->flags);
2968
2969         /* state_protect4_r. Currently only support SP4_NONE */
2970         BUG_ON(exid->spa_how != SP4_NONE);
2971         WRITE32(exid->spa_how);
2972
2973         /* The server_owner struct */
2974         WRITE64(minor_id);      /* Minor id */
2975         /* major id */
2976         WRITE32(major_id_sz);
2977         WRITEMEM(major_id, major_id_sz);
2978
2979         /* Server scope */
2980         WRITE32(server_scope_sz);
2981         WRITEMEM(server_scope, server_scope_sz);
2982
2983         /* Implementation id */
2984         WRITE32(0);     /* zero length nfs_impl_id4 array */
2985         ADJUST_ARGS();
2986         return 0;
2987 }
2988
2989 static __be32
2990 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
2991                             struct nfsd4_create_session *sess)
2992 {
2993         __be32 *p;
2994
2995         if (nfserr)
2996                 return nfserr;
2997
2998         RESERVE_SPACE(24);
2999         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3000         WRITE32(sess->seqid);
3001         WRITE32(sess->flags);
3002         ADJUST_ARGS();
3003
3004         RESERVE_SPACE(28);
3005         WRITE32(0); /* headerpadsz */
3006         WRITE32(sess->fore_channel.maxreq_sz);
3007         WRITE32(sess->fore_channel.maxresp_sz);
3008         WRITE32(sess->fore_channel.maxresp_cached);
3009         WRITE32(sess->fore_channel.maxops);
3010         WRITE32(sess->fore_channel.maxreqs);
3011         WRITE32(sess->fore_channel.nr_rdma_attrs);
3012         ADJUST_ARGS();
3013
3014         if (sess->fore_channel.nr_rdma_attrs) {
3015                 RESERVE_SPACE(4);
3016                 WRITE32(sess->fore_channel.rdma_attrs);
3017                 ADJUST_ARGS();
3018         }
3019
3020         RESERVE_SPACE(28);
3021         WRITE32(0); /* headerpadsz */
3022         WRITE32(sess->back_channel.maxreq_sz);
3023         WRITE32(sess->back_channel.maxresp_sz);
3024         WRITE32(sess->back_channel.maxresp_cached);
3025         WRITE32(sess->back_channel.maxops);
3026         WRITE32(sess->back_channel.maxreqs);
3027         WRITE32(sess->back_channel.nr_rdma_attrs);
3028         ADJUST_ARGS();
3029
3030         if (sess->back_channel.nr_rdma_attrs) {
3031                 RESERVE_SPACE(4);
3032                 WRITE32(sess->back_channel.rdma_attrs);
3033                 ADJUST_ARGS();
3034         }
3035         return 0;
3036 }
3037
3038 static __be32
3039 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3040                              struct nfsd4_destroy_session *destroy_session)
3041 {
3042         return nfserr;
3043 }
3044
3045 __be32
3046 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3047                       struct nfsd4_sequence *seq)
3048 {
3049         __be32 *p;
3050
3051         if (nfserr)
3052                 return nfserr;
3053
3054         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3055         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3056         WRITE32(seq->seqid);
3057         WRITE32(seq->slotid);
3058         WRITE32(seq->maxslots);
3059         /*
3060          * FIXME: for now:
3061          *   target_maxslots = maxslots
3062          *   status_flags = 0
3063          */
3064         WRITE32(seq->maxslots);
3065         WRITE32(0);
3066
3067         ADJUST_ARGS();
3068         resp->cstate.datap = p; /* DRC cache data pointer */
3069         return 0;
3070 }
3071
3072 static __be32
3073 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3074 {
3075         return nfserr;
3076 }
3077
3078 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3079
3080 /*
3081  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3082  * since we don't need to filter out obsolete ops as this is
3083  * done in the decoding phase.
3084  */
3085 static nfsd4_enc nfsd4_enc_ops[] = {
3086         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3087         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3088         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3089         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3090         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3091         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3092         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3093         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3094         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3095         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3096         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3097         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3098         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3099         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3100         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3101         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3102         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3103         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3104         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3105         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3106         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3107         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3108         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3109         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3110         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3111         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3112         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3113         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3114         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3115         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3116         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3117         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3118         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3119         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3120         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3121         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3122         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3123
3124         /* NFSv4.1 operations */
3125         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3126         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_noop,
3127         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3128         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3129         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3130         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3131         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3132         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3133         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3134         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3135         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3136         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3137         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_noop,
3138         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3139         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3140         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3141         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3142         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3143         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3144 };
3145
3146 /*
3147  * Calculate the total amount of memory that the compound response has taken
3148  * after encoding the current operation.
3149  *
3150  * pad: add on 8 bytes for the next operation's op_code and status so that
3151  * there is room to cache a failure on the next operation.
3152  *
3153  * Compare this length to the session se_fmaxresp_cached.
3154  *
3155  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3156  * will be at least a page and will therefore hold the xdr_buf head.
3157  */
3158 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3159 {
3160         int status = 0;
3161         struct xdr_buf *xb = &resp->rqstp->rq_res;
3162         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3163         struct nfsd4_session *session = NULL;
3164         struct nfsd4_slot *slot = resp->cstate.slot;
3165         u32 length, tlen = 0, pad = 8;
3166
3167         if (!nfsd4_has_session(&resp->cstate))
3168                 return status;
3169
3170         session = resp->cstate.session;
3171         if (session == NULL || slot->sl_cachethis == 0)
3172                 return status;
3173
3174         if (resp->opcnt >= args->opcnt)
3175                 pad = 0; /* this is the last operation */
3176
3177         if (xb->page_len == 0) {
3178                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3179         } else {
3180                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3181                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3182
3183                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3184         }
3185         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3186                 length, xb->page_len, tlen, pad);
3187
3188         if (length <= session->se_fchannel.maxresp_cached)
3189                 return status;
3190         else
3191                 return nfserr_rep_too_big_to_cache;
3192 }
3193
3194 void
3195 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3196 {
3197         __be32 *statp;
3198         __be32 *p;
3199
3200         RESERVE_SPACE(8);
3201         WRITE32(op->opnum);
3202         statp = p++;    /* to be backfilled at the end */
3203         ADJUST_ARGS();
3204
3205         if (op->opnum == OP_ILLEGAL)
3206                 goto status;
3207         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3208                !nfsd4_enc_ops[op->opnum]);
3209         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3210         /* nfsd4_check_drc_limit guarantees enough room for error status */
3211         if (!op->status && nfsd4_check_drc_limit(resp))
3212                 op->status = nfserr_rep_too_big_to_cache;
3213 status:
3214         /*
3215          * Note: We write the status directly, instead of using WRITE32(),
3216          * since it is already in network byte order.
3217          */
3218         *statp = op->status;
3219 }
3220
3221 /*
3222  * Encode the reply stored in the stateowner reply cache
3223  *
3224  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3225  * previously sent already encoded operation.
3226  *
3227  * called with nfs4_lock_state() held
3228  */
3229 void
3230 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3231 {
3232         __be32 *p;
3233         struct nfs4_replay *rp = op->replay;
3234
3235         BUG_ON(!rp);
3236
3237         RESERVE_SPACE(8);
3238         WRITE32(op->opnum);
3239         *p++ = rp->rp_status;  /* already xdr'ed */
3240         ADJUST_ARGS();
3241
3242         RESERVE_SPACE(rp->rp_buflen);
3243         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3244         ADJUST_ARGS();
3245 }
3246
3247 int
3248 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3249 {
3250         return xdr_ressize_check(rqstp, p);
3251 }
3252
3253 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3254 {
3255         if (args->ops != args->iops) {
3256                 kfree(args->ops);
3257                 args->ops = args->iops;
3258         }
3259         kfree(args->tmpp);
3260         args->tmpp = NULL;
3261         while (args->to_free) {
3262                 struct tmpbuf *tb = args->to_free;
3263                 args->to_free = tb->next;
3264                 tb->release(tb->buf);
3265                 kfree(tb);
3266         }
3267 }
3268
3269 int
3270 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3271 {
3272         __be32 status;
3273
3274         args->p = p;
3275         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3276         args->pagelist = rqstp->rq_arg.pages;
3277         args->pagelen = rqstp->rq_arg.page_len;
3278         args->tmpp = NULL;
3279         args->to_free = NULL;
3280         args->ops = args->iops;
3281         args->rqstp = rqstp;
3282
3283         status = nfsd4_decode_compound(args);
3284         if (status) {
3285                 nfsd4_release_compoundargs(args);
3286         }
3287         return !status;
3288 }
3289
3290 int
3291 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3292 {
3293         /*
3294          * All that remains is to write the tag and operation count...
3295          */
3296         struct nfsd4_compound_state *cs = &resp->cstate;
3297         struct kvec *iov;
3298         p = resp->tagp;
3299         *p++ = htonl(resp->taglen);
3300         memcpy(p, resp->tag, resp->taglen);
3301         p += XDR_QUADLEN(resp->taglen);
3302         *p++ = htonl(resp->opcnt);
3303
3304         if (rqstp->rq_res.page_len)
3305                 iov = &rqstp->rq_res.tail[0];
3306         else
3307                 iov = &rqstp->rq_res.head[0];
3308         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3309         BUG_ON(iov->iov_len > PAGE_SIZE);
3310         if (nfsd4_has_session(cs)) {
3311                 if (cs->status != nfserr_replay_cache) {
3312                         nfsd4_store_cache_entry(resp);
3313                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3314                         cs->slot->sl_inuse = false;
3315                 }
3316                 /* Renew the clientid on success and on replay */
3317                 release_session_client(cs->session);
3318         }
3319         return 1;
3320 }
3321
3322 /*
3323  * Local variables:
3324  *  c-basic-offset: 8
3325  * End:
3326  */