fs/nfsd/nfs4xdr.c

   1 /*
   2  *  Server-side XDR for NFSv4
   3  *
   4  *  Copyright (c) 2002 The Regents of the University of Michigan.
   5  *  All rights reserved.
   6  *
   7  *  Kendrick Smith <kmsmith@umich.edu>
   8  *  Andy Adamson   <andros@umich.edu>
   9  *
  10  *  Redistribution and use in source and binary forms, with or without
  11  *  modification, are permitted provided that the following conditions
  12  *  are met:
  13  *
  14  *  1. Redistributions of source code must retain the above copyright
  15  *     notice, this list of conditions and the following disclaimer.
  16  *  2. Redistributions in binary form must reproduce the above copyright
  17  *     notice, this list of conditions and the following disclaimer in the
  18  *     documentation and/or other materials provided with the distribution.
  19  *  3. Neither the name of the University nor the names of its
  20  *     contributors may be used to endorse or promote products derived
  21  *     from this software without specific prior written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * TODO: Neil Brown made the following observation:  We currently
  36  * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37  * never release any of that until the request is complete.
  38  * It would be good to calculate a new maximum response size while
  39  * decoding the COMPOUND, and call svc_reserve with this number
  40  * at the end of nfs4svc_decode_compoundargs.
  41  */
  42
  43 #include <linux/slab.h>
  44 #include <linux/namei.h>
  45 #include <linux/statfs.h>
  46 #include <linux/utsname.h>
  47 #include <linux/sunrpc/svcauth_gss.h>
  48
  49 #include "idmap.h"
  50 #include "acl.h"
  51 #include "xdr4.h"
  52 #include "vfs.h"
  53
  54
  55 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  56
  57 /*
  58  * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  59  * directory in order to indicate to the client that a filesystem boundary is present
  60  * We use a fixed fsid for a referral
  61  */
  62 #define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  63 #define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  64
  65 static __be32
  66 check_filename(char *str, int len, __be32 err)
  67 {
  68         int i;
  69
  70         if (len == 0)
  71                 return nfserr_inval;
  72         if (isdotent(str, len))
  73                 return err;
  74         for (i = 0; i < len; i++)
  75                 if (str[i] == '/')
  76                         return err;
  77         return 0;
  78 }
  79
  80 #define DECODE_HEAD                             \
  81         __be32 *p;                              \
  82         __be32 status
  83 #define DECODE_TAIL                             \
  84         status = 0;                             \
  85 out:                                            \
  86         return status;                          \
  87 xdr_error:                                      \
  88         dprintk("NFSD: xdr error (%s:%d)\n",    \
  89                         __FILE__, __LINE__);    \
  90         status = nfserr_bad_xdr;                \
  91         goto out
  92
  93 #define READ32(x)         (x) = ntohl(*p++)
  94 #define READ64(x)         do {                  \
  95         (x) = (u64)ntohl(*p++) << 32;           \
  96         (x) |= ntohl(*p++);                     \
  97 } while (0)
  98 #define READTIME(x)       do {                  \
  99         p++;                                    \
 100         (x) = ntohl(*p++);                      \
 101         p++;                                    \
 102 } while (0)
 103 #define READMEM(x,nbytes) do {                  \
 104         x = (char *)p;                          \
 105         p += XDR_QUADLEN(nbytes);               \
 106 } while (0)
 107 #define SAVEMEM(x,nbytes) do {                  \
 108         if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 109                 savemem(argp, p, nbytes) :      \
 110                 (char *)p)) {                   \
 111                 dprintk("NFSD: xdr error (%s:%d)\n", \
 112                                 __FILE__, __LINE__); \
 113                 goto xdr_error;                 \
 114                 }                               \
 115         p += XDR_QUADLEN(nbytes);               \
 116 } while (0)
 117 #define COPYMEM(x,nbytes) do {                  \
 118         memcpy((x), p, nbytes);                 \
 119         p += XDR_QUADLEN(nbytes);               \
 120 } while (0)
 121
 122 /* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 123 #define READ_BUF(nbytes)  do {                  \
 124         if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 125                 p = argp->p;                    \
 126                 argp->p += XDR_QUADLEN(nbytes); \
 127         } else if (!(p = read_buf(argp, nbytes))) { \
 128                 dprintk("NFSD: xdr error (%s:%d)\n", \
 129                                 __FILE__, __LINE__); \
 130                 goto xdr_error;                 \
 131         }                                       \
 132 } while (0)
 133
 134 static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 135 {
 136         /* We want more bytes than seem to be available.
 137          * Maybe we need a new page, maybe we have just run out
 138          */
 139         unsigned int avail = (char *)argp->end - (char *)argp->p;
 140         __be32 *p;
 141         if (avail + argp->pagelen < nbytes)
 142                 return NULL;
 143         if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 144                 return NULL;
 145         /* ok, we can do it with the current plus the next page */
 146         if (nbytes <= sizeof(argp->tmp))
 147                 p = argp->tmp;
 148         else {
 149                 kfree(argp->tmpp);
 150                 p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 151                 if (!p)
 152                         return NULL;
 153
 154         }
 155         /*
 156          * The following memcpy is safe because read_buf is always
 157          * called with nbytes > avail, and the two cases above both
 158          * guarantee p points to at least nbytes bytes.
 159          */
 160         memcpy(p, argp->p, avail);
 161         /* step to next page */
 162         argp->p = page_address(argp->pagelist[0]);
 163         argp->pagelist++;
 164         if (argp->pagelen < PAGE_SIZE) {
 165                 argp->end = argp->p + (argp->pagelen>>2);
 166                 argp->pagelen = 0;
 167         } else {
 168                 argp->end = argp->p + (PAGE_SIZE>>2);
 169                 argp->pagelen -= PAGE_SIZE;
 170         }
 171         memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 172         argp->p += XDR_QUADLEN(nbytes - avail);
 173         return p;
 174 }
 175
 176 static int zero_clientid(clientid_t *clid)
 177 {
 178         return (clid->cl_boot == 0) && (clid->cl_id == 0);
 179 }
 180
 181 static int
 182 defer_free(struct nfsd4_compoundargs *argp,
 183                 void (*release)(const void *), void *p)
 184 {
 185         struct tmpbuf *tb;
 186
 187         tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 188         if (!tb)
 189                 return -ENOMEM;
 190         tb->buf = p;
 191         tb->release = release;
 192         tb->next = argp->to_free;
 193         argp->to_free = tb;
 194         return 0;
 195 }
 196
 197 static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 198 {
 199         if (p == argp->tmp) {
 200                 p = kmalloc(nbytes, GFP_KERNEL);
 201                 if (!p)
 202                         return NULL;
 203                 memcpy(p, argp->tmp, nbytes);
 204         } else {
 205                 BUG_ON(p != argp->tmpp);
 206                 argp->tmpp = NULL;
 207         }
 208         if (defer_free(argp, kfree, p)) {
 209                 kfree(p);
 210                 return NULL;
 211         } else
 212                 return (char *)p;
 213 }
 214
 215 static __be32
 216 nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 217 {
 218         u32 bmlen;
 219         DECODE_HEAD;
 220
 221         bmval[0] = 0;
 222         bmval[1] = 0;
 223         bmval[2] = 0;
 224
 225         READ_BUF(4);
 226         READ32(bmlen);
 227         if (bmlen > 1000)
 228                 goto xdr_error;
 229
 230         READ_BUF(bmlen << 2);
 231         if (bmlen > 0)
 232                 READ32(bmval[0]);
 233         if (bmlen > 1)
 234                 READ32(bmval[1]);
 235         if (bmlen > 2)
 236                 READ32(bmval[2]);
 237
 238         DECODE_TAIL;
 239 }
 240
 241 static __be32
 242 nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 243                    struct iattr *iattr, struct nfs4_acl **acl)
 244 {
 245         int expected_len, len = 0;
 246         u32 dummy32;
 247         char *buf;
 248         int host_err;
 249
 250         DECODE_HEAD;
 251         iattr->ia_valid = 0;
 252         if ((status = nfsd4_decode_bitmap(argp, bmval)))
 253                 return status;
 254
 255         READ_BUF(4);
 256         READ32(expected_len);
 257
 258         if (bmval[0] & FATTR4_WORD0_SIZE) {
 259                 READ_BUF(8);
 260                 len += 8;
 261                 READ64(iattr->ia_size);
 262                 iattr->ia_valid |= ATTR_SIZE;
 263         }
 264         if (bmval[0] & FATTR4_WORD0_ACL) {
 265                 int nace;
 266                 struct nfs4_ace *ace;
 267
 268                 READ_BUF(4); len += 4;
 269                 READ32(nace);
 270
 271                 if (nace > NFS4_ACL_MAX)
 272                         return nfserr_resource;
 273
 274                 *acl = nfs4_acl_new(nace);
 275                 if (*acl == NULL) {
 276                         host_err = -ENOMEM;
 277                         goto out_nfserr;
 278                 }
 279                 defer_free(argp, kfree, *acl);
 280
 281                 (*acl)->naces = nace;
 282                 for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 283                         READ_BUF(16); len += 16;
 284                         READ32(ace->type);
 285                         READ32(ace->flag);
 286                         READ32(ace->access_mask);
 287                         READ32(dummy32);
 288                         READ_BUF(dummy32);
 289                         len += XDR_QUADLEN(dummy32) << 2;
 290                         READMEM(buf, dummy32);
 291                         ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 292                         status = nfs_ok;
 293                         if (ace->whotype != NFS4_ACL_WHO_NAMED)
 294                                 ace->who = 0;
 295                         else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 296                                 status = nfsd_map_name_to_gid(argp->rqstp,
 297                                                 buf, dummy32, &ace->who);
 298                         else
 299                                 status = nfsd_map_name_to_uid(argp->rqstp,
 300                                                 buf, dummy32, &ace->who);
 301                         if (status)
 302                                 return status;
 303                 }
 304         } else
 305                 *acl = NULL;
 306         if (bmval[1] & FATTR4_WORD1_MODE) {
 307                 READ_BUF(4);
 308                 len += 4;
 309                 READ32(iattr->ia_mode);
 310                 iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 311                 iattr->ia_valid |= ATTR_MODE;
 312         }
 313         if (bmval[1] & FATTR4_WORD1_OWNER) {
 314                 READ_BUF(4);
 315                 len += 4;
 316                 READ32(dummy32);
 317                 READ_BUF(dummy32);
 318                 len += (XDR_QUADLEN(dummy32) << 2);
 319                 READMEM(buf, dummy32);
 320                 if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 321                         return status;
 322                 iattr->ia_valid |= ATTR_UID;
 323         }
 324         if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 325                 READ_BUF(4);
 326                 len += 4;
 327                 READ32(dummy32);
 328                 READ_BUF(dummy32);
 329                 len += (XDR_QUADLEN(dummy32) << 2);
 330                 READMEM(buf, dummy32);
 331                 if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 332                         return status;
 333                 iattr->ia_valid |= ATTR_GID;
 334         }
 335         if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 336                 READ_BUF(4);
 337                 len += 4;
 338                 READ32(dummy32);
 339                 switch (dummy32) {
 340                 case NFS4_SET_TO_CLIENT_TIME:
 341                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 342                            all 32 bits of 'nseconds'. */
 343                         READ_BUF(12);
 344                         len += 12;
 345                         READ32(dummy32);
 346                         if (dummy32)
 347                                 return nfserr_inval;
 348                         READ32(iattr->ia_atime.tv_sec);
 349                         READ32(iattr->ia_atime.tv_nsec);
 350                         if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 351                                 return nfserr_inval;
 352                         iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 353                         break;
 354                 case NFS4_SET_TO_SERVER_TIME:
 355                         iattr->ia_valid |= ATTR_ATIME;
 356                         break;
 357                 default:
 358                         goto xdr_error;
 359                 }
 360         }
 361         if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 362                 READ_BUF(4);
 363                 len += 4;
 364                 READ32(dummy32);
 365                 switch (dummy32) {
 366                 case NFS4_SET_TO_CLIENT_TIME:
 367                         /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 368                            all 32 bits of 'nseconds'. */
 369                         READ_BUF(12);
 370                         len += 12;
 371                         READ32(dummy32);
 372                         if (dummy32)
 373                                 return nfserr_inval;
 374                         READ32(iattr->ia_mtime.tv_sec);
 375                         READ32(iattr->ia_mtime.tv_nsec);
 376                         if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 377                                 return nfserr_inval;
 378                         iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 379                         break;
 380                 case NFS4_SET_TO_SERVER_TIME:
 381                         iattr->ia_valid |= ATTR_MTIME;
 382                         break;
 383                 default:
 384                         goto xdr_error;
 385                 }
 386         }
 387         if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 388             || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 389             || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 390                 READ_BUF(expected_len - len);
 391         else if (len != expected_len)
 392                 goto xdr_error;
 393
 394         DECODE_TAIL;
 395
 396 out_nfserr:
 397         status = nfserrno(host_err);
 398         goto out;
 399 }
 400
 401 static __be32
 402 nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 403 {
 404         DECODE_HEAD;
 405
 406         READ_BUF(sizeof(stateid_t));
 407         READ32(sid->si_generation);
 408         COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 409
 410         DECODE_TAIL;
 411 }
 412
 413 static __be32
 414 nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 415 {
 416         DECODE_HEAD;
 417
 418         READ_BUF(4);
 419         READ32(access->ac_req_access);
 420
 421         DECODE_TAIL;
 422 }
 423
 424 static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 425 {
 426         DECODE_HEAD;
 427
 428         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 429         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 430         READ32(bcts->dir);
 431         /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 432          * could help us figure out we should be using it. */
 433         DECODE_TAIL;
 434 }
 435
 436 static __be32
 437 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 438 {
 439         DECODE_HEAD;
 440
 441         close->cl_stateowner = NULL;
 442         READ_BUF(4);
 443         READ32(close->cl_seqid);
 444         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 445
 446         DECODE_TAIL;
 447 }
 448
 449
 450 static __be32
 451 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 452 {
 453         DECODE_HEAD;
 454
 455         READ_BUF(12);
 456         READ64(commit->co_offset);
 457         READ32(commit->co_count);
 458
 459         DECODE_TAIL;
 460 }
 461
 462 static __be32
 463 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 464 {
 465         DECODE_HEAD;
 466
 467         READ_BUF(4);
 468         READ32(create->cr_type);
 469         switch (create->cr_type) {
 470         case NF4LNK:
 471                 READ_BUF(4);
 472                 READ32(create->cr_linklen);
 473                 READ_BUF(create->cr_linklen);
 474                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 475                 break;
 476         case NF4BLK:
 477         case NF4CHR:
 478                 READ_BUF(8);
 479                 READ32(create->cr_specdata1);
 480                 READ32(create->cr_specdata2);
 481                 break;
 482         case NF4SOCK:
 483         case NF4FIFO:
 484         case NF4DIR:
 485         default:
 486                 break;
 487         }
 488
 489         READ_BUF(4);
 490         READ32(create->cr_namelen);
 491         READ_BUF(create->cr_namelen);
 492         SAVEMEM(create->cr_name, create->cr_namelen);
 493         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 494                 return status;
 495
 496         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 497                                     &create->cr_acl);
 498         if (status)
 499                 goto out;
 500
 501         DECODE_TAIL;
 502 }
 503
 504 static inline __be32
 505 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 506 {
 507         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 508 }
 509
 510 static inline __be32
 511 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 512 {
 513         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 514 }
 515
 516 static __be32
 517 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 518 {
 519         DECODE_HEAD;
 520
 521         READ_BUF(4);
 522         READ32(link->li_namelen);
 523         READ_BUF(link->li_namelen);
 524         SAVEMEM(link->li_name, link->li_namelen);
 525         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 526                 return status;
 527
 528         DECODE_TAIL;
 529 }
 530
 531 static __be32
 532 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 533 {
 534         DECODE_HEAD;
 535
 536         lock->lk_replay_owner = NULL;
 537         /*
 538         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 539         */
 540         READ_BUF(28);
 541         READ32(lock->lk_type);
 542         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 543                 goto xdr_error;
 544         READ32(lock->lk_reclaim);
 545         READ64(lock->lk_offset);
 546         READ64(lock->lk_length);
 547         READ32(lock->lk_is_new);
 548
 549         if (lock->lk_is_new) {
 550                 READ_BUF(4);
 551                 READ32(lock->lk_new_open_seqid);
 552                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 553                 if (status)
 554                         return status;
 555                 READ_BUF(8 + sizeof(clientid_t));
 556                 READ32(lock->lk_new_lock_seqid);
 557                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 558                 READ32(lock->lk_new_owner.len);
 559                 READ_BUF(lock->lk_new_owner.len);
 560                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 561         } else {
 562                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 563                 if (status)
 564                         return status;
 565                 READ_BUF(4);
 566                 READ32(lock->lk_old_lock_seqid);
 567         }
 568
 569         DECODE_TAIL;
 570 }
 571
 572 static __be32
 573 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 574 {
 575         DECODE_HEAD;
 576
 577         READ_BUF(32);
 578         READ32(lockt->lt_type);
 579         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 580                 goto xdr_error;
 581         READ64(lockt->lt_offset);
 582         READ64(lockt->lt_length);
 583         COPYMEM(&lockt->lt_clientid, 8);
 584         READ32(lockt->lt_owner.len);
 585         READ_BUF(lockt->lt_owner.len);
 586         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 587
 588         DECODE_TAIL;
 589 }
 590
 591 static __be32
 592 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 593 {
 594         DECODE_HEAD;
 595
 596         locku->lu_stateowner = NULL;
 597         READ_BUF(8);
 598         READ32(locku->lu_type);
 599         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 600                 goto xdr_error;
 601         READ32(locku->lu_seqid);
 602         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 603         if (status)
 604                 return status;
 605         READ_BUF(16);
 606         READ64(locku->lu_offset);
 607         READ64(locku->lu_length);
 608
 609         DECODE_TAIL;
 610 }
 611
 612 static __be32
 613 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 614 {
 615         DECODE_HEAD;
 616
 617         READ_BUF(4);
 618         READ32(lookup->lo_len);
 619         READ_BUF(lookup->lo_len);
 620         SAVEMEM(lookup->lo_name, lookup->lo_len);
 621         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 622                 return status;
 623
 624         DECODE_TAIL;
 625 }
 626
 627 static __be32
 628 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 629 {
 630         DECODE_HEAD;
 631
 632         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 633         open->op_iattr.ia_valid = 0;
 634         open->op_stateowner = NULL;
 635
 636         /* seqid, share_access, share_deny, clientid, ownerlen */
 637         READ_BUF(16 + sizeof(clientid_t));
 638         READ32(open->op_seqid);
 639         READ32(open->op_share_access);
 640         READ32(open->op_share_deny);
 641         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 642         READ32(open->op_owner.len);
 643
 644         /* owner, open_flag */
 645         READ_BUF(open->op_owner.len + 4);
 646         SAVEMEM(open->op_owner.data, open->op_owner.len);
 647         READ32(open->op_create);
 648         switch (open->op_create) {
 649         case NFS4_OPEN_NOCREATE:
 650                 break;
 651         case NFS4_OPEN_CREATE:
 652                 READ_BUF(4);
 653                 READ32(open->op_createmode);
 654                 switch (open->op_createmode) {
 655                 case NFS4_CREATE_UNCHECKED:
 656                 case NFS4_CREATE_GUARDED:
 657                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 658                                 &open->op_iattr, &open->op_acl);
 659                         if (status)
 660                                 goto out;
 661                         break;
 662                 case NFS4_CREATE_EXCLUSIVE:
 663                         READ_BUF(8);
 664                         COPYMEM(open->op_verf.data, 8);
 665                         break;
 666                 case NFS4_CREATE_EXCLUSIVE4_1:
 667                         if (argp->minorversion < 1)
 668                                 goto xdr_error;
 669                         READ_BUF(8);
 670                         COPYMEM(open->op_verf.data, 8);
 671                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 672                                 &open->op_iattr, &open->op_acl);
 673                         if (status)
 674                                 goto out;
 675                         break;
 676                 default:
 677                         goto xdr_error;
 678                 }
 679                 break;
 680         default:
 681                 goto xdr_error;
 682         }
 683
 684         /* open_claim */
 685         READ_BUF(4);
 686         READ32(open->op_claim_type);
 687         switch (open->op_claim_type) {
 688         case NFS4_OPEN_CLAIM_NULL:
 689         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 690                 READ_BUF(4);
 691                 READ32(open->op_fname.len);
 692                 READ_BUF(open->op_fname.len);
 693                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 694                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 695                         return status;
 696                 break;
 697         case NFS4_OPEN_CLAIM_PREVIOUS:
 698                 READ_BUF(4);
 699                 READ32(open->op_delegate_type);
 700                 break;
 701         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 702                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 703                 if (status)
 704                         return status;
 705                 READ_BUF(4);
 706                 READ32(open->op_fname.len);
 707                 READ_BUF(open->op_fname.len);
 708                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 709                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 710                         return status;
 711                 break;
 712         default:
 713                 goto xdr_error;
 714         }
 715
 716         DECODE_TAIL;
 717 }
 718
 719 static __be32
 720 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 721 {
 722         DECODE_HEAD;
 723
 724         open_conf->oc_stateowner = NULL;
 725         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 726         if (status)
 727                 return status;
 728         READ_BUF(4);
 729         READ32(open_conf->oc_seqid);
 730
 731         DECODE_TAIL;
 732 }
 733
 734 static __be32
 735 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 736 {
 737         DECODE_HEAD;
 738
 739         open_down->od_stateowner = NULL;
 740         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 741         if (status)
 742                 return status;
 743         READ_BUF(12);
 744         READ32(open_down->od_seqid);
 745         READ32(open_down->od_share_access);
 746         READ32(open_down->od_share_deny);
 747
 748         DECODE_TAIL;
 749 }
 750
 751 static __be32
 752 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 753 {
 754         DECODE_HEAD;
 755
 756         READ_BUF(4);
 757         READ32(putfh->pf_fhlen);
 758         if (putfh->pf_fhlen > NFS4_FHSIZE)
 759                 goto xdr_error;
 760         READ_BUF(putfh->pf_fhlen);
 761         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 762
 763         DECODE_TAIL;
 764 }
 765
 766 static __be32
 767 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 768 {
 769         DECODE_HEAD;
 770
 771         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 772         if (status)
 773                 return status;
 774         READ_BUF(12);
 775         READ64(read->rd_offset);
 776         READ32(read->rd_length);
 777
 778         DECODE_TAIL;
 779 }
 780
 781 static __be32
 782 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 783 {
 784         DECODE_HEAD;
 785
 786         READ_BUF(24);
 787         READ64(readdir->rd_cookie);
 788         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 789         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 790         READ32(readdir->rd_maxcount);
 791         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 792                 goto out;
 793
 794         DECODE_TAIL;
 795 }
 796
 797 static __be32
 798 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 799 {
 800         DECODE_HEAD;
 801
 802         READ_BUF(4);
 803         READ32(remove->rm_namelen);
 804         READ_BUF(remove->rm_namelen);
 805         SAVEMEM(remove->rm_name, remove->rm_namelen);
 806         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 807                 return status;
 808
 809         DECODE_TAIL;
 810 }
 811
 812 static __be32
 813 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 814 {
 815         DECODE_HEAD;
 816
 817         READ_BUF(4);
 818         READ32(rename->rn_snamelen);
 819         READ_BUF(rename->rn_snamelen + 4);
 820         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 821         READ32(rename->rn_tnamelen);
 822         READ_BUF(rename->rn_tnamelen);
 823         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 824         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 825                 return status;
 826         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 827                 return status;
 828
 829         DECODE_TAIL;
 830 }
 831
 832 static __be32
 833 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 834 {
 835         DECODE_HEAD;
 836
 837         READ_BUF(sizeof(clientid_t));
 838         COPYMEM(clientid, sizeof(clientid_t));
 839
 840         DECODE_TAIL;
 841 }
 842
 843 static __be32
 844 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 845                      struct nfsd4_secinfo *secinfo)
 846 {
 847         DECODE_HEAD;
 848
 849         READ_BUF(4);
 850         READ32(secinfo->si_namelen);
 851         READ_BUF(secinfo->si_namelen);
 852         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 853         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 854                                                                 nfserr_noent);
 855         if (status)
 856                 return status;
 857         DECODE_TAIL;
 858 }
 859
 860 static __be32
 861 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
 862                      struct nfsd4_secinfo_no_name *sin)
 863 {
 864         DECODE_HEAD;
 865
 866         READ_BUF(4);
 867         READ32(sin->sin_style);
 868         DECODE_TAIL;
 869 }
 870
 871 static __be32
 872 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 873 {
 874         __be32 status;
 875
 876         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 877         if (status)
 878                 return status;
 879         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 880                                   &setattr->sa_acl);
 881 }
 882
 883 static __be32
 884 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 885 {
 886         DECODE_HEAD;
 887
 888         READ_BUF(12);
 889         COPYMEM(setclientid->se_verf.data, 8);
 890         READ32(setclientid->se_namelen);
 891
 892         READ_BUF(setclientid->se_namelen + 8);
 893         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 894         READ32(setclientid->se_callback_prog);
 895         READ32(setclientid->se_callback_netid_len);
 896
 897         READ_BUF(setclientid->se_callback_netid_len + 4);
 898         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 899         READ32(setclientid->se_callback_addr_len);
 900
 901         READ_BUF(setclientid->se_callback_addr_len + 4);
 902         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 903         READ32(setclientid->se_callback_ident);
 904
 905         DECODE_TAIL;
 906 }
 907
 908 static __be32
 909 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 910 {
 911         DECODE_HEAD;
 912
 913         READ_BUF(8 + sizeof(nfs4_verifier));
 914         COPYMEM(&scd_c->sc_clientid, 8);
 915         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 916
 917         DECODE_TAIL;
 918 }
 919
 920 /* Also used for NVERIFY */
 921 static __be32
 922 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 923 {
 924 #if 0
 925         struct nfsd4_compoundargs save = {
 926                 .p = argp->p,
 927                 .end = argp->end,
 928                 .rqstp = argp->rqstp,
 929         };
 930         u32             ve_bmval[2];
 931         struct iattr    ve_iattr;           /* request */
 932         struct nfs4_acl *ve_acl;            /* request */
 933 #endif
 934         DECODE_HEAD;
 935
 936         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 937                 goto out;
 938
 939         /* For convenience's sake, we compare raw xdr'd attributes in
 940          * nfsd4_proc_verify; however we still decode here just to return
 941          * correct error in case of bad xdr. */
 942 #if 0
 943         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 944         if (status == nfserr_inval) {
 945                 status = nfserrno(status);
 946                 goto out;
 947         }
 948 #endif
 949         READ_BUF(4);
 950         READ32(verify->ve_attrlen);
 951         READ_BUF(verify->ve_attrlen);
 952         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 953
 954         DECODE_TAIL;
 955 }
 956
 957 static __be32
 958 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 959 {
 960         int avail;
 961         int v;
 962         int len;
 963         DECODE_HEAD;
 964
 965         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 966         if (status)
 967                 return status;
 968         READ_BUF(16);
 969         READ64(write->wr_offset);
 970         READ32(write->wr_stable_how);
 971         if (write->wr_stable_how > 2)
 972                 goto xdr_error;
 973         READ32(write->wr_buflen);
 974
 975         /* Sorry .. no magic macros for this.. *
 976          * READ_BUF(write->wr_buflen);
 977          * SAVEMEM(write->wr_buf, write->wr_buflen);
 978          */
 979         avail = (char*)argp->end - (char*)argp->p;
 980         if (avail + argp->pagelen < write->wr_buflen) {
 981                 dprintk("NFSD: xdr error (%s:%d)\n",
 982                                 __FILE__, __LINE__);
 983                 goto xdr_error;
 984         }
 985         argp->rqstp->rq_vec[0].iov_base = p;
 986         argp->rqstp->rq_vec[0].iov_len = avail;
 987         v = 0;
 988         len = write->wr_buflen;
 989         while (len > argp->rqstp->rq_vec[v].iov_len) {
 990                 len -= argp->rqstp->rq_vec[v].iov_len;
 991                 v++;
 992                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 993                 argp->pagelist++;
 994                 if (argp->pagelen >= PAGE_SIZE) {
 995                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 996                         argp->pagelen -= PAGE_SIZE;
 997                 } else {
 998                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
 999                         argp->pagelen -= len;
1000                 }
1001         }
1002         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1003         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1004         argp->rqstp->rq_vec[v].iov_len = len;
1005         write->wr_vlen = v+1;
1006
1007         DECODE_TAIL;
1008 }
1009
1010 static __be32
1011 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1012 {
1013         DECODE_HEAD;
1014
1015         READ_BUF(12);
1016         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1017         READ32(rlockowner->rl_owner.len);
1018         READ_BUF(rlockowner->rl_owner.len);
1019         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1020
1021         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1022                 return nfserr_inval;
1023         DECODE_TAIL;
1024 }
1025
1026 static __be32
1027 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1028                          struct nfsd4_exchange_id *exid)
1029 {
1030         int dummy, tmp;
1031         DECODE_HEAD;
1032
1033         READ_BUF(NFS4_VERIFIER_SIZE);
1034         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1035
1036         READ_BUF(4);
1037         READ32(exid->clname.len);
1038
1039         READ_BUF(exid->clname.len);
1040         SAVEMEM(exid->clname.data, exid->clname.len);
1041
1042         READ_BUF(4);
1043         READ32(exid->flags);
1044
1045         /* Ignore state_protect4_a */
1046         READ_BUF(4);
1047         READ32(exid->spa_how);
1048         switch (exid->spa_how) {
1049         case SP4_NONE:
1050                 break;
1051         case SP4_MACH_CRED:
1052                 /* spo_must_enforce */
1053                 READ_BUF(4);
1054                 READ32(dummy);
1055                 READ_BUF(dummy * 4);
1056                 p += dummy;
1057
1058                 /* spo_must_allow */
1059                 READ_BUF(4);
1060                 READ32(dummy);
1061                 READ_BUF(dummy * 4);
1062                 p += dummy;
1063                 break;
1064         case SP4_SSV:
1065                 /* ssp_ops */
1066                 READ_BUF(4);
1067                 READ32(dummy);
1068                 READ_BUF(dummy * 4);
1069                 p += dummy;
1070
1071                 READ_BUF(4);
1072                 READ32(dummy);
1073                 READ_BUF(dummy * 4);
1074                 p += dummy;
1075
1076                 /* ssp_hash_algs<> */
1077                 READ_BUF(4);
1078                 READ32(tmp);
1079                 while (tmp--) {
1080                         READ_BUF(4);
1081                         READ32(dummy);
1082                         READ_BUF(dummy);
1083                         p += XDR_QUADLEN(dummy);
1084                 }
1085
1086                 /* ssp_encr_algs<> */
1087                 READ_BUF(4);
1088                 READ32(tmp);
1089                 while (tmp--) {
1090                         READ_BUF(4);
1091                         READ32(dummy);
1092                         READ_BUF(dummy);
1093                         p += XDR_QUADLEN(dummy);
1094                 }
1095
1096                 /* ssp_window and ssp_num_gss_handles */
1097                 READ_BUF(8);
1098                 READ32(dummy);
1099                 READ32(dummy);
1100                 break;
1101         default:
1102                 goto xdr_error;
1103         }
1104
1105         /* Ignore Implementation ID */
1106         READ_BUF(4);    /* nfs_impl_id4 array length */
1107         READ32(dummy);
1108
1109         if (dummy > 1)
1110                 goto xdr_error;
1111
1112         if (dummy == 1) {
1113                 /* nii_domain */
1114                 READ_BUF(4);
1115                 READ32(dummy);
1116                 READ_BUF(dummy);
1117                 p += XDR_QUADLEN(dummy);
1118
1119                 /* nii_name */
1120                 READ_BUF(4);
1121                 READ32(dummy);
1122                 READ_BUF(dummy);
1123                 p += XDR_QUADLEN(dummy);
1124
1125                 /* nii_date */
1126                 READ_BUF(12);
1127                 p += 3;
1128         }
1129         DECODE_TAIL;
1130 }
1131
1132 static __be32
1133 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1134                             struct nfsd4_create_session *sess)
1135 {
1136         DECODE_HEAD;
1137
1138         u32 dummy;
1139         char *machine_name;
1140         int i;
1141         int nr_secflavs;
1142
1143         READ_BUF(16);
1144         COPYMEM(&sess->clientid, 8);
1145         READ32(sess->seqid);
1146         READ32(sess->flags);
1147
1148         /* Fore channel attrs */
1149         READ_BUF(28);
1150         READ32(dummy); /* headerpadsz is always 0 */
1151         READ32(sess->fore_channel.maxreq_sz);
1152         READ32(sess->fore_channel.maxresp_sz);
1153         READ32(sess->fore_channel.maxresp_cached);
1154         READ32(sess->fore_channel.maxops);
1155         READ32(sess->fore_channel.maxreqs);
1156         READ32(sess->fore_channel.nr_rdma_attrs);
1157         if (sess->fore_channel.nr_rdma_attrs == 1) {
1158                 READ_BUF(4);
1159                 READ32(sess->fore_channel.rdma_attrs);
1160         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1161                 dprintk("Too many fore channel attr bitmaps!\n");
1162                 goto xdr_error;
1163         }
1164
1165         /* Back channel attrs */
1166         READ_BUF(28);
1167         READ32(dummy); /* headerpadsz is always 0 */
1168         READ32(sess->back_channel.maxreq_sz);
1169         READ32(sess->back_channel.maxresp_sz);
1170         READ32(sess->back_channel.maxresp_cached);
1171         READ32(sess->back_channel.maxops);
1172         READ32(sess->back_channel.maxreqs);
1173         READ32(sess->back_channel.nr_rdma_attrs);
1174         if (sess->back_channel.nr_rdma_attrs == 1) {
1175                 READ_BUF(4);
1176                 READ32(sess->back_channel.rdma_attrs);
1177         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1178                 dprintk("Too many back channel attr bitmaps!\n");
1179                 goto xdr_error;
1180         }
1181
1182         READ_BUF(8);
1183         READ32(sess->callback_prog);
1184
1185         /* callback_sec_params4 */
1186         READ32(nr_secflavs);
1187         for (i = 0; i < nr_secflavs; ++i) {
1188                 READ_BUF(4);
1189                 READ32(dummy);
1190                 switch (dummy) {
1191                 case RPC_AUTH_NULL:
1192                         /* Nothing to read */
1193                         break;
1194                 case RPC_AUTH_UNIX:
1195                         READ_BUF(8);
1196                         /* stamp */
1197                         READ32(dummy);
1198
1199                         /* machine name */
1200                         READ32(dummy);
1201                         READ_BUF(dummy);
1202                         SAVEMEM(machine_name, dummy);
1203
1204                         /* uid, gid */
1205                         READ_BUF(8);
1206                         READ32(sess->uid);
1207                         READ32(sess->gid);
1208
1209                         /* more gids */
1210                         READ_BUF(4);
1211                         READ32(dummy);
1212                         READ_BUF(dummy * 4);
1213                         break;
1214                 case RPC_AUTH_GSS:
1215                         dprintk("RPC_AUTH_GSS callback secflavor "
1216                                 "not supported!\n");
1217                         READ_BUF(8);
1218                         /* gcbp_service */
1219                         READ32(dummy);
1220                         /* gcbp_handle_from_server */
1221                         READ32(dummy);
1222                         READ_BUF(dummy);
1223                         p += XDR_QUADLEN(dummy);
1224                         /* gcbp_handle_from_client */
1225                         READ_BUF(4);
1226                         READ32(dummy);
1227                         READ_BUF(dummy);
1228                         break;
1229                 default:
1230                         dprintk("Illegal callback secflavor\n");
1231                         return nfserr_inval;
1232                 }
1233         }
1234         DECODE_TAIL;
1235 }
1236
1237 static __be32
1238 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1239                              struct nfsd4_destroy_session *destroy_session)
1240 {
1241         DECODE_HEAD;
1242         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1243         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1244
1245         DECODE_TAIL;
1246 }
1247
1248 static __be32
1249 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1250                       struct nfsd4_sequence *seq)
1251 {
1252         DECODE_HEAD;
1253
1254         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1255         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1256         READ32(seq->seqid);
1257         READ32(seq->slotid);
1258         READ32(seq->maxslots);
1259         READ32(seq->cachethis);
1260
1261         DECODE_TAIL;
1262 }
1263
1264 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1265 {
1266         DECODE_HEAD;
1267
1268         READ_BUF(4);
1269         READ32(rc->rca_one_fs);
1270
1271         DECODE_TAIL;
1272 }
1273
1274 static __be32
1275 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1276 {
1277         return nfs_ok;
1278 }
1279
1280 static __be32
1281 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1282 {
1283         return nfserr_notsupp;
1284 }
1285
1286 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1287
1288 static nfsd4_dec nfsd4_dec_ops[] = {
1289         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1290         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1291         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1292         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1293         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1294         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1295         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1296         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1297         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1298         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1299         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1300         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1301         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1302         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1303         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1304         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1305         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1306         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1307         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1308         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1309         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1310         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1311         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1312         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1313         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1314         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1315         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1316         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1317         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1318         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1319         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1320         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1321         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1322         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1323         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1324         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1325         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1326 };
1327
1328 static nfsd4_dec nfsd41_dec_ops[] = {
1329         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1330         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1331         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1332         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1333         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1334         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1335         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1336         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1337         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1338         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1339         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1340         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1341         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1342         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1343         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1344         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1345         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1346         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1347         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1348         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1349         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1350         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1351         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1352         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1353         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1354         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1355         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1356         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1357         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1358         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1359         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1360         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1361         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1362         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1363         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1364         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1365         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1366
1367         /* new operations for NFSv4.1 */
1368         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1369         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1370         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1371         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1372         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1373         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1374         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1375         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1376         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1377         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1378         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1379         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1380         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1381         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1382         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1383         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1384         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1385         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_notsupp,
1386         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1387 };
1388
1389 struct nfsd4_minorversion_ops {
1390         nfsd4_dec *decoders;
1391         int nops;
1392 };
1393
1394 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1395         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1396         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1397 };
1398
1399 static __be32
1400 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1401 {
1402         DECODE_HEAD;
1403         struct nfsd4_op *op;
1404         struct nfsd4_minorversion_ops *ops;
1405         int i;
1406
1407         /*
1408          * XXX: According to spec, we should check the tag
1409          * for UTF-8 compliance.  I'm postponing this for
1410          * now because it seems that some clients do use
1411          * binary tags.
1412          */
1413         READ_BUF(4);
1414         READ32(argp->taglen);
1415         READ_BUF(argp->taglen + 8);
1416         SAVEMEM(argp->tag, argp->taglen);
1417         READ32(argp->minorversion);
1418         READ32(argp->opcnt);
1419
1420         if (argp->taglen > NFSD4_MAX_TAGLEN)
1421                 goto xdr_error;
1422         if (argp->opcnt > 100)
1423                 goto xdr_error;
1424
1425         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1426                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1427                 if (!argp->ops) {
1428                         argp->ops = argp->iops;
1429                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1430                         goto xdr_error;
1431                 }
1432         }
1433
1434         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1435                 argp->opcnt = 0;
1436
1437         ops = &nfsd4_minorversion[argp->minorversion];
1438         for (i = 0; i < argp->opcnt; i++) {
1439                 op = &argp->ops[i];
1440                 op->replay = NULL;
1441
1442                 /*
1443                  * We can't use READ_BUF() here because we need to handle
1444                  * a missing opcode as an OP_WRITE + 1. So we need to check
1445                  * to see if we're truly at the end of our buffer or if there
1446                  * is another page we need to flip to.
1447                  */
1448
1449                 if (argp->p == argp->end) {
1450                         if (argp->pagelen < 4) {
1451                                 /* There isn't an opcode still on the wire */
1452                                 op->opnum = OP_WRITE + 1;
1453                                 op->status = nfserr_bad_xdr;
1454                                 argp->opcnt = i+1;
1455                                 break;
1456                         }
1457
1458                         /*
1459                          * False alarm. We just hit a page boundary, but there
1460                          * is still data available.  Move pointer across page
1461                          * boundary.  *snip from READ_BUF*
1462                          */
1463                         argp->p = page_address(argp->pagelist[0]);
1464                         argp->pagelist++;
1465                         if (argp->pagelen < PAGE_SIZE) {
1466                                 argp->end = argp->p + (argp->pagelen>>2);
1467                                 argp->pagelen = 0;
1468                         } else {
1469                                 argp->end = argp->p + (PAGE_SIZE>>2);
1470                                 argp->pagelen -= PAGE_SIZE;
1471                         }
1472                 }
1473                 op->opnum = ntohl(*argp->p++);
1474
1475                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1476                         op->status = ops->decoders[op->opnum](argp, &op->u);
1477                 else {
1478                         op->opnum = OP_ILLEGAL;
1479                         op->status = nfserr_op_illegal;
1480                 }
1481
1482                 if (op->status) {
1483                         argp->opcnt = i+1;
1484                         break;
1485                 }
1486         }
1487
1488         DECODE_TAIL;
1489 }
1490
1491 #define WRITE32(n)               *p++ = htonl(n)
1492 #define WRITE64(n)               do {                           \
1493         *p++ = htonl((u32)((n) >> 32));                         \
1494         *p++ = htonl((u32)(n));                                 \
1495 } while (0)
1496 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1497         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1498         memcpy(p, ptr, nbytes);                                 \
1499         p += XDR_QUADLEN(nbytes);                               \
1500 }} while (0)
1501
1502 static void write32(__be32 **p, u32 n)
1503 {
1504         *(*p)++ = n;
1505 }
1506
1507 static void write64(__be32 **p, u64 n)
1508 {
1509         write32(p, (u32)(n >> 32));
1510         write32(p, (u32)n);
1511 }
1512
1513 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1514 {
1515         if (IS_I_VERSION(inode)) {
1516                 write64(p, inode->i_version);
1517         } else {
1518                 write32(p, stat->ctime.tv_sec);
1519                 write32(p, stat->ctime.tv_nsec);
1520         }
1521 }
1522
1523 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1524 {
1525         write32(p, c->atomic);
1526         if (c->change_supported) {
1527                 write64(p, c->before_change);
1528                 write64(p, c->after_change);
1529         } else {
1530                 write32(p, c->before_ctime_sec);
1531                 write32(p, c->before_ctime_nsec);
1532                 write32(p, c->after_ctime_sec);
1533                 write32(p, c->after_ctime_nsec);
1534         }
1535 }
1536
1537 #define RESERVE_SPACE(nbytes)   do {                            \
1538         p = resp->p;                                            \
1539         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1540 } while (0)
1541 #define ADJUST_ARGS()           resp->p = p
1542
1543 /*
1544  * Header routine to setup seqid operation replay cache
1545  */
1546 #define ENCODE_SEQID_OP_HEAD                                    \
1547         __be32 *save;                                           \
1548                                                                 \
1549         save = resp->p;
1550
1551 /*
1552  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1553  * is where sequence id's are incremented, and the replay cache is filled.
1554  * Note that we increment sequence id's here, at the last moment, so we're sure
1555  * we know whether the error to be returned is a sequence id mutating error.
1556  */
1557
1558 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1559         if (seqid_mutating_err(nfserr) && stateowner) {         \
1560                 stateowner->so_seqid++;                         \
1561                 stateowner->so_replay.rp_status = nfserr;       \
1562                 stateowner->so_replay.rp_buflen =               \
1563                           (((char *)(resp)->p - (char *)save)); \
1564                 memcpy(stateowner->so_replay.rp_buf, save,      \
1565                         stateowner->so_replay.rp_buflen);       \
1566         } } while (0);
1567
1568 /* Encode as an array of strings the string given with components
1569  * separated @sep.
1570  */
1571 static __be32 nfsd4_encode_components(char sep, char *components,
1572                                    __be32 **pp, int *buflen)
1573 {
1574         __be32 *p = *pp;
1575         __be32 *countp = p;
1576         int strlen, count=0;
1577         char *str, *end;
1578
1579         dprintk("nfsd4_encode_components(%s)\n", components);
1580         if ((*buflen -= 4) < 0)
1581                 return nfserr_resource;
1582         WRITE32(0); /* We will fill this in with @count later */
1583         end = str = components;
1584         while (*end) {
1585                 for (; *end && (*end != sep); end++)
1586                         ; /* Point to end of component */
1587                 strlen = end - str;
1588                 if (strlen) {
1589                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1590                                 return nfserr_resource;
1591                         WRITE32(strlen);
1592                         WRITEMEM(str, strlen);
1593                         count++;
1594                 }
1595                 else
1596                         end++;
1597                 str = end;
1598         }
1599         *pp = p;
1600         p = countp;
1601         WRITE32(count);
1602         return 0;
1603 }
1604
1605 /*
1606  * encode a location element of a fs_locations structure
1607  */
1608 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1609                                     __be32 **pp, int *buflen)
1610 {
1611         __be32 status;
1612         __be32 *p = *pp;
1613
1614         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1615         if (status)
1616                 return status;
1617         status = nfsd4_encode_components('/', location->path, &p, buflen);
1618         if (status)
1619                 return status;
1620         *pp = p;
1621         return 0;
1622 }
1623
1624 /*
1625  * Return the path to an export point in the pseudo filesystem namespace
1626  * Returned string is safe to use as long as the caller holds a reference
1627  * to @exp.
1628  */
1629 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1630 {
1631         struct svc_fh tmp_fh;
1632         char *path = NULL, *rootpath;
1633         size_t rootlen;
1634
1635         fh_init(&tmp_fh, NFS4_FHSIZE);
1636         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1637         if (*stat)
1638                 return NULL;
1639         rootpath = tmp_fh.fh_export->ex_pathname;
1640
1641         path = exp->ex_pathname;
1642
1643         rootlen = strlen(rootpath);
1644         if (strncmp(path, rootpath, rootlen)) {
1645                 dprintk("nfsd: fs_locations failed;"
1646                         "%s is not contained in %s\n", path, rootpath);
1647                 *stat = nfserr_notsupp;
1648                 path = NULL;
1649                 goto out;
1650         }
1651         path += rootlen;
1652 out:
1653         fh_put(&tmp_fh);
1654         return path;
1655 }
1656
1657 /*
1658  *  encode a fs_locations structure
1659  */
1660 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1661                                      struct svc_export *exp,
1662                                      __be32 **pp, int *buflen)
1663 {
1664         __be32 status;
1665         int i;
1666         __be32 *p = *pp;
1667         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1668         char *root = nfsd4_path(rqstp, exp, &status);
1669
1670         if (status)
1671                 return status;
1672         status = nfsd4_encode_components('/', root, &p, buflen);
1673         if (status)
1674                 return status;
1675         if ((*buflen -= 4) < 0)
1676                 return nfserr_resource;
1677         WRITE32(fslocs->locations_count);
1678         for (i=0; i<fslocs->locations_count; i++) {
1679                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1680                                                    &p, buflen);
1681                 if (status)
1682                         return status;
1683         }
1684         *pp = p;
1685         return 0;
1686 }
1687
1688 static u32 nfs4_ftypes[16] = {
1689         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1690         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1691         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1692         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1693 };
1694
1695 static __be32
1696 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1697                         __be32 **p, int *buflen)
1698 {
1699         int status;
1700
1701         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1702                 return nfserr_resource;
1703         if (whotype != NFS4_ACL_WHO_NAMED)
1704                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1705         else if (group)
1706                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1707         else
1708                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1709         if (status < 0)
1710                 return nfserrno(status);
1711         *p = xdr_encode_opaque(*p, NULL, status);
1712         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1713         BUG_ON(*buflen < 0);
1714         return 0;
1715 }
1716
1717 static inline __be32
1718 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1719 {
1720         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1721 }
1722
1723 static inline __be32
1724 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1725 {
1726         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1727 }
1728
1729 static inline __be32
1730 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1731                 __be32 **p, int *buflen)
1732 {
1733         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1734 }
1735
1736 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1737                               FATTR4_WORD0_RDATTR_ERROR)
1738 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1739
1740 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1741 {
1742         /* As per referral draft:  */
1743         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1744             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1745                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1746                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1747                         *rdattr_err = NFSERR_MOVED;
1748                 else
1749                         return nfserr_moved;
1750         }
1751         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1752         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1753         return 0;
1754 }
1755
1756 /*
1757  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1758  * ourselves.
1759  *
1760  * @countp is the buffer size in _words_; upon successful return this becomes
1761  * replaced with the number of words written.
1762  */
1763 __be32
1764 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1765                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1766                 struct svc_rqst *rqstp, int ignore_crossmnt)
1767 {
1768         u32 bmval0 = bmval[0];
1769         u32 bmval1 = bmval[1];
1770         u32 bmval2 = bmval[2];
1771         struct kstat stat;
1772         struct svc_fh tempfh;
1773         struct kstatfs statfs;
1774         int buflen = *countp << 2;
1775         __be32 *attrlenp;
1776         u32 dummy;
1777         u64 dummy64;
1778         u32 rdattr_err = 0;
1779         __be32 *p = buffer;
1780         __be32 status;
1781         int err;
1782         int aclsupport = 0;
1783         struct nfs4_acl *acl = NULL;
1784         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1785         u32 minorversion = resp->cstate.minorversion;
1786         struct path path = {
1787                 .mnt    = exp->ex_path.mnt,
1788                 .dentry = dentry,
1789         };
1790
1791         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1792         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1793         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1794         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1795
1796         if (exp->ex_fslocs.migrated) {
1797                 BUG_ON(bmval[2]);
1798                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1799                 if (status)
1800                         goto out;
1801         }
1802
1803         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1804         if (err)
1805                 goto out_nfserr;
1806         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1807                         FATTR4_WORD0_MAXNAME)) ||
1808             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1809                        FATTR4_WORD1_SPACE_TOTAL))) {
1810                 err = vfs_statfs(&path, &statfs);
1811                 if (err)
1812                         goto out_nfserr;
1813         }
1814         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1815                 fh_init(&tempfh, NFS4_FHSIZE);
1816                 status = fh_compose(&tempfh, exp, dentry, NULL);
1817                 if (status)
1818                         goto out;
1819                 fhp = &tempfh;
1820         }
1821         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1822                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1823                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1824                 aclsupport = (err == 0);
1825                 if (bmval0 & FATTR4_WORD0_ACL) {
1826                         if (err == -EOPNOTSUPP)
1827                                 bmval0 &= ~FATTR4_WORD0_ACL;
1828                         else if (err == -EINVAL) {
1829                                 status = nfserr_attrnotsupp;
1830                                 goto out;
1831                         } else if (err != 0)
1832                                 goto out_nfserr;
1833                 }
1834         }
1835
1836         if (bmval2) {
1837                 if ((buflen -= 16) < 0)
1838                         goto out_resource;
1839                 WRITE32(3);
1840                 WRITE32(bmval0);
1841                 WRITE32(bmval1);
1842                 WRITE32(bmval2);
1843         } else if (bmval1) {
1844                 if ((buflen -= 12) < 0)
1845                         goto out_resource;
1846                 WRITE32(2);
1847                 WRITE32(bmval0);
1848                 WRITE32(bmval1);
1849         } else {
1850                 if ((buflen -= 8) < 0)
1851                         goto out_resource;
1852                 WRITE32(1);
1853                 WRITE32(bmval0);
1854         }
1855         attrlenp = p++;                /* to be backfilled later */
1856
1857         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1858                 u32 word0 = nfsd_suppattrs0(minorversion);
1859                 u32 word1 = nfsd_suppattrs1(minorversion);
1860                 u32 word2 = nfsd_suppattrs2(minorversion);
1861
1862                 if (!aclsupport)
1863                         word0 &= ~FATTR4_WORD0_ACL;
1864                 if (!word2) {
1865                         if ((buflen -= 12) < 0)
1866                                 goto out_resource;
1867                         WRITE32(2);
1868                         WRITE32(word0);
1869                         WRITE32(word1);
1870                 } else {
1871                         if ((buflen -= 16) < 0)
1872                                 goto out_resource;
1873                         WRITE32(3);
1874                         WRITE32(word0);
1875                         WRITE32(word1);
1876                         WRITE32(word2);
1877                 }
1878         }
1879         if (bmval0 & FATTR4_WORD0_TYPE) {
1880                 if ((buflen -= 4) < 0)
1881                         goto out_resource;
1882                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1883                 if (dummy == NF4BAD)
1884                         goto out_serverfault;
1885                 WRITE32(dummy);
1886         }
1887         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1888                 if ((buflen -= 4) < 0)
1889                         goto out_resource;
1890                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1891                         WRITE32(NFS4_FH_PERSISTENT);
1892                 else
1893                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1894         }
1895         if (bmval0 & FATTR4_WORD0_CHANGE) {
1896                 if ((buflen -= 8) < 0)
1897                         goto out_resource;
1898                 write_change(&p, &stat, dentry->d_inode);
1899         }
1900         if (bmval0 & FATTR4_WORD0_SIZE) {
1901                 if ((buflen -= 8) < 0)
1902                         goto out_resource;
1903                 WRITE64(stat.size);
1904         }
1905         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1906                 if ((buflen -= 4) < 0)
1907                         goto out_resource;
1908                 WRITE32(1);
1909         }
1910         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1911                 if ((buflen -= 4) < 0)
1912                         goto out_resource;
1913                 WRITE32(1);
1914         }
1915         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1916                 if ((buflen -= 4) < 0)
1917                         goto out_resource;
1918                 WRITE32(0);
1919         }
1920         if (bmval0 & FATTR4_WORD0_FSID) {
1921                 if ((buflen -= 16) < 0)
1922                         goto out_resource;
1923                 if (exp->ex_fslocs.migrated) {
1924                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1925                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1926                 } else switch(fsid_source(fhp)) {
1927                 case FSIDSOURCE_FSID:
1928                         WRITE64((u64)exp->ex_fsid);
1929                         WRITE64((u64)0);
1930                         break;
1931                 case FSIDSOURCE_DEV:
1932                         WRITE32(0);
1933                         WRITE32(MAJOR(stat.dev));
1934                         WRITE32(0);
1935                         WRITE32(MINOR(stat.dev));
1936                         break;
1937                 case FSIDSOURCE_UUID:
1938                         WRITEMEM(exp->ex_uuid, 16);
1939                         break;
1940                 }
1941         }
1942         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1943                 if ((buflen -= 4) < 0)
1944                         goto out_resource;
1945                 WRITE32(0);
1946         }
1947         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1948                 if ((buflen -= 4) < 0)
1949                         goto out_resource;
1950                 WRITE32(nfsd4_lease);
1951         }
1952         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1953                 if ((buflen -= 4) < 0)
1954                         goto out_resource;
1955                 WRITE32(rdattr_err);
1956         }
1957         if (bmval0 & FATTR4_WORD0_ACL) {
1958                 struct nfs4_ace *ace;
1959
1960                 if (acl == NULL) {
1961                         if ((buflen -= 4) < 0)
1962                                 goto out_resource;
1963
1964                         WRITE32(0);
1965                         goto out_acl;
1966                 }
1967                 if ((buflen -= 4) < 0)
1968                         goto out_resource;
1969                 WRITE32(acl->naces);
1970
1971                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1972                         if ((buflen -= 4*3) < 0)
1973                                 goto out_resource;
1974                         WRITE32(ace->type);
1975                         WRITE32(ace->flag);
1976                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1977                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1978                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1979                                 &p, &buflen);
1980                         if (status == nfserr_resource)
1981                                 goto out_resource;
1982                         if (status)
1983                                 goto out;
1984                 }
1985         }
1986 out_acl:
1987         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1988                 if ((buflen -= 4) < 0)
1989                         goto out_resource;
1990                 WRITE32(aclsupport ?
1991                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
1992         }
1993         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
1994                 if ((buflen -= 4) < 0)
1995                         goto out_resource;
1996                 WRITE32(1);
1997         }
1998         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
1999                 if ((buflen -= 4) < 0)
2000                         goto out_resource;
2001                 WRITE32(1);
2002         }
2003         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2004                 if ((buflen -= 4) < 0)
2005                         goto out_resource;
2006                 WRITE32(1);
2007         }
2008         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2009                 if ((buflen -= 4) < 0)
2010                         goto out_resource;
2011                 WRITE32(1);
2012         }
2013         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2014                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2015                 if (buflen < 0)
2016                         goto out_resource;
2017                 WRITE32(fhp->fh_handle.fh_size);
2018                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2019         }
2020         if (bmval0 & FATTR4_WORD0_FILEID) {
2021                 if ((buflen -= 8) < 0)
2022                         goto out_resource;
2023                 WRITE64(stat.ino);
2024         }
2025         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2026                 if ((buflen -= 8) < 0)
2027                         goto out_resource;
2028                 WRITE64((u64) statfs.f_ffree);
2029         }
2030         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2031                 if ((buflen -= 8) < 0)
2032                         goto out_resource;
2033                 WRITE64((u64) statfs.f_ffree);
2034         }
2035         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2036                 if ((buflen -= 8) < 0)
2037                         goto out_resource;
2038                 WRITE64((u64) statfs.f_files);
2039         }
2040         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2041                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2042                 if (status == nfserr_resource)
2043                         goto out_resource;
2044                 if (status)
2045                         goto out;
2046         }
2047         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2048                 if ((buflen -= 4) < 0)
2049                         goto out_resource;
2050                 WRITE32(1);
2051         }
2052         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2053                 if ((buflen -= 8) < 0)
2054                         goto out_resource;
2055                 WRITE64(~(u64)0);
2056         }
2057         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2058                 if ((buflen -= 4) < 0)
2059                         goto out_resource;
2060                 WRITE32(255);
2061         }
2062         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2063                 if ((buflen -= 4) < 0)
2064                         goto out_resource;
2065                 WRITE32(statfs.f_namelen);
2066         }
2067         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2068                 if ((buflen -= 8) < 0)
2069                         goto out_resource;
2070                 WRITE64((u64) svc_max_payload(rqstp));
2071         }
2072         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2073                 if ((buflen -= 8) < 0)
2074                         goto out_resource;
2075                 WRITE64((u64) svc_max_payload(rqstp));
2076         }
2077         if (bmval1 & FATTR4_WORD1_MODE) {
2078                 if ((buflen -= 4) < 0)
2079                         goto out_resource;
2080                 WRITE32(stat.mode & S_IALLUGO);
2081         }
2082         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2083                 if ((buflen -= 4) < 0)
2084                         goto out_resource;
2085                 WRITE32(1);
2086         }
2087         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2088                 if ((buflen -= 4) < 0)
2089                         goto out_resource;
2090                 WRITE32(stat.nlink);
2091         }
2092         if (bmval1 & FATTR4_WORD1_OWNER) {
2093                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2094                 if (status == nfserr_resource)
2095                         goto out_resource;
2096                 if (status)
2097                         goto out;
2098         }
2099         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2100                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2101                 if (status == nfserr_resource)
2102                         goto out_resource;
2103                 if (status)
2104                         goto out;
2105         }
2106         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2107                 if ((buflen -= 8) < 0)
2108                         goto out_resource;
2109                 WRITE32((u32) MAJOR(stat.rdev));
2110                 WRITE32((u32) MINOR(stat.rdev));
2111         }
2112         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2113                 if ((buflen -= 8) < 0)
2114                         goto out_resource;
2115                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2116                 WRITE64(dummy64);
2117         }
2118         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2119                 if ((buflen -= 8) < 0)
2120                         goto out_resource;
2121                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2122                 WRITE64(dummy64);
2123         }
2124         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2125                 if ((buflen -= 8) < 0)
2126                         goto out_resource;
2127                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2128                 WRITE64(dummy64);
2129         }
2130         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2131                 if ((buflen -= 8) < 0)
2132                         goto out_resource;
2133                 dummy64 = (u64)stat.blocks << 9;
2134                 WRITE64(dummy64);
2135         }
2136         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2137                 if ((buflen -= 12) < 0)
2138                         goto out_resource;
2139                 WRITE32(0);
2140                 WRITE32(stat.atime.tv_sec);
2141                 WRITE32(stat.atime.tv_nsec);
2142         }
2143         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2144                 if ((buflen -= 12) < 0)
2145                         goto out_resource;
2146                 WRITE32(0);
2147                 WRITE32(1);
2148                 WRITE32(0);
2149         }
2150         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2151                 if ((buflen -= 12) < 0)
2152                         goto out_resource;
2153                 WRITE32(0);
2154                 WRITE32(stat.ctime.tv_sec);
2155                 WRITE32(stat.ctime.tv_nsec);
2156         }
2157         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2158                 if ((buflen -= 12) < 0)
2159                         goto out_resource;
2160                 WRITE32(0);
2161                 WRITE32(stat.mtime.tv_sec);
2162                 WRITE32(stat.mtime.tv_nsec);
2163         }
2164         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2165                 if ((buflen -= 8) < 0)
2166                         goto out_resource;
2167                 /*
2168                  * Get parent's attributes if not ignoring crossmount
2169                  * and this is the root of a cross-mounted filesystem.
2170                  */
2171                 if (ignore_crossmnt == 0 &&
2172                     dentry == exp->ex_path.mnt->mnt_root) {
2173                         struct path path = exp->ex_path;
2174                         path_get(&path);
2175                         while (follow_up(&path)) {
2176                                 if (path.dentry != path.mnt->mnt_root)
2177                                         break;
2178                         }
2179                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2180                         path_put(&path);
2181                         if (err)
2182                                 goto out_nfserr;
2183                 }
2184                 WRITE64(stat.ino);
2185         }
2186         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2187                 WRITE32(3);
2188                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2189                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2190                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2191         }
2192
2193         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2194         *countp = p - buffer;
2195         status = nfs_ok;
2196
2197 out:
2198         kfree(acl);
2199         if (fhp == &tempfh)
2200                 fh_put(&tempfh);
2201         return status;
2202 out_nfserr:
2203         status = nfserrno(err);
2204         goto out;
2205 out_resource:
2206         *countp = 0;
2207         status = nfserr_resource;
2208         goto out;
2209 out_serverfault:
2210         status = nfserr_serverfault;
2211         goto out;
2212 }
2213
2214 static inline int attributes_need_mount(u32 *bmval)
2215 {
2216         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2217                 return 1;
2218         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2219                 return 1;
2220         return 0;
2221 }
2222
2223 static __be32
2224 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2225                 const char *name, int namlen, __be32 *p, int *buflen)
2226 {
2227         struct svc_export *exp = cd->rd_fhp->fh_export;
2228         struct dentry *dentry;
2229         __be32 nfserr;
2230         int ignore_crossmnt = 0;
2231
2232         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2233         if (IS_ERR(dentry))
2234                 return nfserrno(PTR_ERR(dentry));
2235         if (!dentry->d_inode) {
2236                 /*
2237                  * nfsd_buffered_readdir drops the i_mutex between
2238                  * readdir and calling this callback, leaving a window
2239                  * where this directory entry could have gone away.
2240                  */
2241                 dput(dentry);
2242                 return nfserr_noent;
2243         }
2244
2245         exp_get(exp);
2246         /*
2247          * In the case of a mountpoint, the client may be asking for
2248          * attributes that are only properties of the underlying filesystem
2249          * as opposed to the cross-mounted file system. In such a case,
2250          * we will not follow the cross mount and will fill the attribtutes
2251          * directly from the mountpoint dentry.
2252          */
2253         if (nfsd_mountpoint(dentry, exp)) {
2254                 int err;
2255
2256                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2257                                 && !attributes_need_mount(cd->rd_bmval)) {
2258                         ignore_crossmnt = 1;
2259                         goto out_encode;
2260                 }
2261                 /*
2262                  * Why the heck aren't we just using nfsd_lookup??
2263                  * Different "."/".." handling?  Something else?
2264                  * At least, add a comment here to explain....
2265                  */
2266                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2267                 if (err) {
2268                         nfserr = nfserrno(err);
2269                         goto out_put;
2270                 }
2271                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2272                 if (nfserr)
2273                         goto out_put;
2274
2275         }
2276 out_encode:
2277         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2278                                         cd->rd_rqstp, ignore_crossmnt);
2279 out_put:
2280         dput(dentry);
2281         exp_put(exp);
2282         return nfserr;
2283 }
2284
2285 static __be32 *
2286 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2287 {
2288         __be32 *attrlenp;
2289
2290         if (buflen < 6)
2291                 return NULL;
2292         *p++ = htonl(2);
2293         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2294         *p++ = htonl(0);                         /* bmval1 */
2295
2296         attrlenp = p++;
2297         *p++ = nfserr;       /* no htonl */
2298         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2299         return p;
2300 }
2301
2302 static int
2303 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2304                     loff_t offset, u64 ino, unsigned int d_type)
2305 {
2306         struct readdir_cd *ccd = ccdv;
2307         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2308         int buflen;
2309         __be32 *p = cd->buffer;
2310         __be32 *cookiep;
2311         __be32 nfserr = nfserr_toosmall;
2312
2313         /* In nfsv4, "." and ".." never make it onto the wire.. */
2314         if (name && isdotent(name, namlen)) {
2315                 cd->common.err = nfs_ok;
2316                 return 0;
2317         }
2318
2319         if (cd->offset)
2320                 xdr_encode_hyper(cd->offset, (u64) offset);
2321
2322         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2323         if (buflen < 0)
2324                 goto fail;
2325
2326         *p++ = xdr_one;                             /* mark entry present */
2327         cookiep = p;
2328         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2329         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2330
2331         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2332         switch (nfserr) {
2333         case nfs_ok:
2334                 p += buflen;
2335                 break;
2336         case nfserr_resource:
2337                 nfserr = nfserr_toosmall;
2338                 goto fail;
2339         case nfserr_noent:
2340                 goto skip_entry;
2341         default:
2342                 /*
2343                  * If the client requested the RDATTR_ERROR attribute,
2344                  * we stuff the error code into this attribute
2345                  * and continue.  If this attribute was not requested,
2346                  * then in accordance with the spec, we fail the
2347                  * entire READDIR operation(!)
2348                  */
2349                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2350                         goto fail;
2351                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2352                 if (p == NULL) {
2353                         nfserr = nfserr_toosmall;
2354                         goto fail;
2355                 }
2356         }
2357         cd->buflen -= (p - cd->buffer);
2358         cd->buffer = p;
2359         cd->offset = cookiep;
2360 skip_entry:
2361         cd->common.err = nfs_ok;
2362         return 0;
2363 fail:
2364         cd->common.err = nfserr;
2365         return -EINVAL;
2366 }
2367
2368 static void
2369 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2370 {
2371         __be32 *p;
2372
2373         RESERVE_SPACE(sizeof(stateid_t));
2374         WRITE32(sid->si_generation);
2375         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2376         ADJUST_ARGS();
2377 }
2378
2379 static __be32
2380 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2381 {
2382         __be32 *p;
2383
2384         if (!nfserr) {
2385                 RESERVE_SPACE(8);
2386                 WRITE32(access->ac_supported);
2387                 WRITE32(access->ac_resp_access);
2388                 ADJUST_ARGS();
2389         }
2390         return nfserr;
2391 }
2392
2393 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2394 {
2395         __be32 *p;
2396
2397         if (!nfserr) {
2398                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2399                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2400                 WRITE32(bcts->dir);
2401                 /* XXX: ? */
2402                 WRITE32(0);
2403                 ADJUST_ARGS();
2404         }
2405         return nfserr;
2406 }
2407
2408 static __be32
2409 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2410 {
2411         ENCODE_SEQID_OP_HEAD;
2412
2413         if (!nfserr)
2414                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2415
2416         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2417         return nfserr;
2418 }
2419
2420
2421 static __be32
2422 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2423 {
2424         __be32 *p;
2425
2426         if (!nfserr) {
2427                 RESERVE_SPACE(8);
2428                 WRITEMEM(commit->co_verf.data, 8);
2429                 ADJUST_ARGS();
2430         }
2431         return nfserr;
2432 }
2433
2434 static __be32
2435 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2436 {
2437         __be32 *p;
2438
2439         if (!nfserr) {
2440                 RESERVE_SPACE(32);
2441                 write_cinfo(&p, &create->cr_cinfo);
2442                 WRITE32(2);
2443                 WRITE32(create->cr_bmval[0]);
2444                 WRITE32(create->cr_bmval[1]);
2445                 ADJUST_ARGS();
2446         }
2447         return nfserr;
2448 }
2449
2450 static __be32
2451 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2452 {
2453         struct svc_fh *fhp = getattr->ga_fhp;
2454         int buflen;
2455
2456         if (nfserr)
2457                 return nfserr;
2458
2459         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2460         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2461                                     resp->p, &buflen, getattr->ga_bmval,
2462                                     resp->rqstp, 0);
2463         if (!nfserr)
2464                 resp->p += buflen;
2465         return nfserr;
2466 }
2467
2468 static __be32
2469 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2470 {
2471         struct svc_fh *fhp = *fhpp;
2472         unsigned int len;
2473         __be32 *p;
2474
2475         if (!nfserr) {
2476                 len = fhp->fh_handle.fh_size;
2477                 RESERVE_SPACE(len + 4);
2478                 WRITE32(len);
2479                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2480                 ADJUST_ARGS();
2481         }
2482         return nfserr;
2483 }
2484
2485 /*
2486 * Including all fields other than the name, a LOCK4denied structure requires
2487 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2488 */
2489 static void
2490 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2491 {
2492         __be32 *p;
2493
2494         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2495         WRITE64(ld->ld_start);
2496         WRITE64(ld->ld_length);
2497         WRITE32(ld->ld_type);
2498         if (ld->ld_sop) {
2499                 WRITEMEM(&ld->ld_clientid, 8);
2500                 WRITE32(ld->ld_sop->so_owner.len);
2501                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2502                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2503         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2504                 WRITE64((u64)0); /* clientid */
2505                 WRITE32(0); /* length of owner name */
2506         }
2507         ADJUST_ARGS();
2508 }
2509
2510 static __be32
2511 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2512 {
2513         ENCODE_SEQID_OP_HEAD;
2514
2515         if (!nfserr)
2516                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2517         else if (nfserr == nfserr_denied)
2518                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2519
2520         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2521         return nfserr;
2522 }
2523
2524 static __be32
2525 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2526 {
2527         if (nfserr == nfserr_denied)
2528                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2529         return nfserr;
2530 }
2531
2532 static __be32
2533 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2534 {
2535         ENCODE_SEQID_OP_HEAD;
2536
2537         if (!nfserr)
2538                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2539
2540         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2541         return nfserr;
2542 }
2543
2544
2545 static __be32
2546 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2547 {
2548         __be32 *p;
2549
2550         if (!nfserr) {
2551                 RESERVE_SPACE(20);
2552                 write_cinfo(&p, &link->li_cinfo);
2553                 ADJUST_ARGS();
2554         }
2555         return nfserr;
2556 }
2557
2558
2559 static __be32
2560 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2561 {
2562         __be32 *p;
2563         ENCODE_SEQID_OP_HEAD;
2564
2565         if (nfserr)
2566                 goto out;
2567
2568         nfsd4_encode_stateid(resp, &open->op_stateid);
2569         RESERVE_SPACE(40);
2570         write_cinfo(&p, &open->op_cinfo);
2571         WRITE32(open->op_rflags);
2572         WRITE32(2);
2573         WRITE32(open->op_bmval[0]);
2574         WRITE32(open->op_bmval[1]);
2575         WRITE32(open->op_delegate_type);
2576         ADJUST_ARGS();
2577
2578         switch (open->op_delegate_type) {
2579         case NFS4_OPEN_DELEGATE_NONE:
2580                 break;
2581         case NFS4_OPEN_DELEGATE_READ:
2582                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2583                 RESERVE_SPACE(20);
2584                 WRITE32(open->op_recall);
2585
2586                 /*
2587                  * TODO: ACE's in delegations
2588                  */
2589                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2590                 WRITE32(0);
2591                 WRITE32(0);
2592                 WRITE32(0);   /* XXX: is NULL principal ok? */
2593                 ADJUST_ARGS();
2594                 break;
2595         case NFS4_OPEN_DELEGATE_WRITE:
2596                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2597                 RESERVE_SPACE(32);
2598                 WRITE32(0);
2599
2600                 /*
2601                  * TODO: space_limit's in delegations
2602                  */
2603                 WRITE32(NFS4_LIMIT_SIZE);
2604                 WRITE32(~(u32)0);
2605                 WRITE32(~(u32)0);
2606
2607                 /*
2608                  * TODO: ACE's in delegations
2609                  */
2610                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2611                 WRITE32(0);
2612                 WRITE32(0);
2613                 WRITE32(0);   /* XXX: is NULL principal ok? */
2614                 ADJUST_ARGS();
2615                 break;
2616         default:
2617                 BUG();
2618         }
2619         /* XXX save filehandle here */
2620 out:
2621         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2622         return nfserr;
2623 }
2624
2625 static __be32
2626 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2627 {
2628         ENCODE_SEQID_OP_HEAD;
2629
2630         if (!nfserr)
2631                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2632
2633         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2634         return nfserr;
2635 }
2636
2637 static __be32
2638 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2639 {
2640         ENCODE_SEQID_OP_HEAD;
2641
2642         if (!nfserr)
2643                 nfsd4_encode_stateid(resp, &od->od_stateid);
2644
2645         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2646         return nfserr;
2647 }
2648
2649 static __be32
2650 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2651                   struct nfsd4_read *read)
2652 {
2653         u32 eof;
2654         int v, pn;
2655         unsigned long maxcount;
2656         long len;
2657         __be32 *p;
2658
2659         if (nfserr)
2660                 return nfserr;
2661         if (resp->xbuf->page_len)
2662                 return nfserr_resource;
2663
2664         RESERVE_SPACE(8); /* eof flag and byte count */
2665
2666         maxcount = svc_max_payload(resp->rqstp);
2667         if (maxcount > read->rd_length)
2668                 maxcount = read->rd_length;
2669
2670         len = maxcount;
2671         v = 0;
2672         while (len > 0) {
2673                 pn = resp->rqstp->rq_resused++;
2674                 resp->rqstp->rq_vec[v].iov_base =
2675                         page_address(resp->rqstp->rq_respages[pn]);
2676                 resp->rqstp->rq_vec[v].iov_len =
2677                         len < PAGE_SIZE ? len : PAGE_SIZE;
2678                 v++;
2679                 len -= PAGE_SIZE;
2680         }
2681         read->rd_vlen = v;
2682
2683         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2684                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2685                         &maxcount);
2686
2687         if (nfserr == nfserr_symlink)
2688                 nfserr = nfserr_inval;
2689         if (nfserr)
2690                 return nfserr;
2691         eof = (read->rd_offset + maxcount >=
2692                read->rd_fhp->fh_dentry->d_inode->i_size);
2693
2694         WRITE32(eof);
2695         WRITE32(maxcount);
2696         ADJUST_ARGS();
2697         resp->xbuf->head[0].iov_len = (char*)p
2698                                         - (char*)resp->xbuf->head[0].iov_base;
2699         resp->xbuf->page_len = maxcount;
2700
2701         /* Use rest of head for padding and remaining ops: */
2702         resp->xbuf->tail[0].iov_base = p;
2703         resp->xbuf->tail[0].iov_len = 0;
2704         if (maxcount&3) {
2705                 RESERVE_SPACE(4);
2706                 WRITE32(0);
2707                 resp->xbuf->tail[0].iov_base += maxcount&3;
2708                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2709                 ADJUST_ARGS();
2710         }
2711         return 0;
2712 }
2713
2714 static __be32
2715 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2716 {
2717         int maxcount;
2718         char *page;
2719         __be32 *p;
2720
2721         if (nfserr)
2722                 return nfserr;
2723         if (resp->xbuf->page_len)
2724                 return nfserr_resource;
2725
2726         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2727
2728         maxcount = PAGE_SIZE;
2729         RESERVE_SPACE(4);
2730
2731         /*
2732          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2733          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2734          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2735          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2736          */
2737         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2738         if (nfserr == nfserr_isdir)
2739                 return nfserr_inval;
2740         if (nfserr)
2741                 return nfserr;
2742
2743         WRITE32(maxcount);
2744         ADJUST_ARGS();
2745         resp->xbuf->head[0].iov_len = (char*)p
2746                                 - (char*)resp->xbuf->head[0].iov_base;
2747         resp->xbuf->page_len = maxcount;
2748
2749         /* Use rest of head for padding and remaining ops: */
2750         resp->xbuf->tail[0].iov_base = p;
2751         resp->xbuf->tail[0].iov_len = 0;
2752         if (maxcount&3) {
2753                 RESERVE_SPACE(4);
2754                 WRITE32(0);
2755                 resp->xbuf->tail[0].iov_base += maxcount&3;
2756                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2757                 ADJUST_ARGS();
2758         }
2759         return 0;
2760 }
2761
2762 static __be32
2763 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2764 {
2765         int maxcount;
2766         loff_t offset;
2767         __be32 *page, *savep, *tailbase;
2768         __be32 *p;
2769
2770         if (nfserr)
2771                 return nfserr;
2772         if (resp->xbuf->page_len)
2773                 return nfserr_resource;
2774
2775         RESERVE_SPACE(8);  /* verifier */
2776         savep = p;
2777
2778         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2779         WRITE32(0);
2780         WRITE32(0);
2781         ADJUST_ARGS();
2782         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2783         tailbase = p;
2784
2785         maxcount = PAGE_SIZE;
2786         if (maxcount > readdir->rd_maxcount)
2787                 maxcount = readdir->rd_maxcount;
2788
2789         /*
2790          * Convert from bytes to words, account for the two words already
2791          * written, make sure to leave two words at the end for the next
2792          * pointer and eof field.
2793          */
2794         maxcount = (maxcount >> 2) - 4;
2795         if (maxcount < 0) {
2796                 nfserr =  nfserr_toosmall;
2797                 goto err_no_verf;
2798         }
2799
2800         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2801         readdir->common.err = 0;
2802         readdir->buflen = maxcount;
2803         readdir->buffer = page;
2804         readdir->offset = NULL;
2805
2806         offset = readdir->rd_cookie;
2807         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2808                               &offset,
2809                               &readdir->common, nfsd4_encode_dirent);
2810         if (nfserr == nfs_ok &&
2811             readdir->common.err == nfserr_toosmall &&
2812             readdir->buffer == page)
2813                 nfserr = nfserr_toosmall;
2814         if (nfserr == nfserr_symlink)
2815                 nfserr = nfserr_notdir;
2816         if (nfserr)
2817                 goto err_no_verf;
2818
2819         if (readdir->offset)
2820                 xdr_encode_hyper(readdir->offset, offset);
2821
2822         p = readdir->buffer;
2823         *p++ = 0;       /* no more entries */
2824         *p++ = htonl(readdir->common.err == nfserr_eof);
2825         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2826                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2827
2828         /* Use rest of head for padding and remaining ops: */
2829         resp->xbuf->tail[0].iov_base = tailbase;
2830         resp->xbuf->tail[0].iov_len = 0;
2831         resp->p = resp->xbuf->tail[0].iov_base;
2832         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2833
2834         return 0;
2835 err_no_verf:
2836         p = savep;
2837         ADJUST_ARGS();
2838         return nfserr;
2839 }
2840
2841 static __be32
2842 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2843 {
2844         __be32 *p;
2845
2846         if (!nfserr) {
2847                 RESERVE_SPACE(20);
2848                 write_cinfo(&p, &remove->rm_cinfo);
2849                 ADJUST_ARGS();
2850         }
2851         return nfserr;
2852 }
2853
2854 static __be32
2855 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2856 {
2857         __be32 *p;
2858
2859         if (!nfserr) {
2860                 RESERVE_SPACE(40);
2861                 write_cinfo(&p, &rename->rn_sinfo);
2862                 write_cinfo(&p, &rename->rn_tinfo);
2863                 ADJUST_ARGS();
2864         }
2865         return nfserr;
2866 }
2867
2868 static __be32
2869 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
2870                          __be32 nfserr,struct svc_export *exp)
2871 {
2872         int i = 0;
2873         u32 nflavs;
2874         struct exp_flavor_info *flavs;
2875         struct exp_flavor_info def_flavs[2];
2876         __be32 *p;
2877
2878         if (nfserr)
2879                 goto out;
2880         if (exp->ex_nflavors) {
2881                 flavs = exp->ex_flavors;
2882                 nflavs = exp->ex_nflavors;
2883         } else { /* Handling of some defaults in absence of real secinfo: */
2884                 flavs = def_flavs;
2885                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2886                         nflavs = 2;
2887                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2888                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2889                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2890                         nflavs = 1;
2891                         flavs[0].pseudoflavor
2892                                         = svcauth_gss_flavor(exp->ex_client);
2893                 } else {
2894                         nflavs = 1;
2895                         flavs[0].pseudoflavor
2896                                         = exp->ex_client->flavour->flavour;
2897                 }
2898         }
2899
2900         RESERVE_SPACE(4);
2901         WRITE32(nflavs);
2902         ADJUST_ARGS();
2903         for (i = 0; i < nflavs; i++) {
2904                 u32 flav = flavs[i].pseudoflavor;
2905                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2906
2907                 if (gm) {
2908                         RESERVE_SPACE(4);
2909                         WRITE32(RPC_AUTH_GSS);
2910                         ADJUST_ARGS();
2911                         RESERVE_SPACE(4 + gm->gm_oid.len);
2912                         WRITE32(gm->gm_oid.len);
2913                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2914                         ADJUST_ARGS();
2915                         RESERVE_SPACE(4);
2916                         WRITE32(0); /* qop */
2917                         ADJUST_ARGS();
2918                         RESERVE_SPACE(4);
2919                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2920                         ADJUST_ARGS();
2921                         gss_mech_put(gm);
2922                 } else {
2923                         RESERVE_SPACE(4);
2924                         WRITE32(flav);
2925                         ADJUST_ARGS();
2926                 }
2927         }
2928 out:
2929         if (exp)
2930                 exp_put(exp);
2931         return nfserr;
2932 }
2933
2934 static __be32
2935 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2936                      struct nfsd4_secinfo *secinfo)
2937 {
2938         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
2939 }
2940
2941 static __be32
2942 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
2943                      struct nfsd4_secinfo_no_name *secinfo)
2944 {
2945         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
2946 }
2947
2948 /*
2949  * The SETATTR encode routine is special -- it always encodes a bitmap,
2950  * regardless of the error status.
2951  */
2952 static __be32
2953 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2954 {
2955         __be32 *p;
2956
2957         RESERVE_SPACE(12);
2958         if (nfserr) {
2959                 WRITE32(2);
2960                 WRITE32(0);
2961                 WRITE32(0);
2962         }
2963         else {
2964                 WRITE32(2);
2965                 WRITE32(setattr->sa_bmval[0]);
2966                 WRITE32(setattr->sa_bmval[1]);
2967         }
2968         ADJUST_ARGS();
2969         return nfserr;
2970 }
2971
2972 static __be32
2973 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2974 {
2975         __be32 *p;
2976
2977         if (!nfserr) {
2978                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2979                 WRITEMEM(&scd->se_clientid, 8);
2980                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2981                 ADJUST_ARGS();
2982         }
2983         else if (nfserr == nfserr_clid_inuse) {
2984                 RESERVE_SPACE(8);
2985                 WRITE32(0);
2986                 WRITE32(0);
2987                 ADJUST_ARGS();
2988         }
2989         return nfserr;
2990 }
2991
2992 static __be32
2993 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
2994 {
2995         __be32 *p;
2996
2997         if (!nfserr) {
2998                 RESERVE_SPACE(16);
2999                 WRITE32(write->wr_bytes_written);
3000                 WRITE32(write->wr_how_written);
3001                 WRITEMEM(write->wr_verifier.data, 8);
3002                 ADJUST_ARGS();
3003         }
3004         return nfserr;
3005 }
3006
3007 static __be32
3008 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3009                          struct nfsd4_exchange_id *exid)
3010 {
3011         __be32 *p;
3012         char *major_id;
3013         char *server_scope;
3014         int major_id_sz;
3015         int server_scope_sz;
3016         uint64_t minor_id = 0;
3017
3018         if (nfserr)
3019                 return nfserr;
3020
3021         major_id = utsname()->nodename;
3022         major_id_sz = strlen(major_id);
3023         server_scope = utsname()->nodename;
3024         server_scope_sz = strlen(server_scope);
3025
3026         RESERVE_SPACE(
3027                 8 /* eir_clientid */ +
3028                 4 /* eir_sequenceid */ +
3029                 4 /* eir_flags */ +
3030                 4 /* spr_how (SP4_NONE) */ +
3031                 8 /* so_minor_id */ +
3032                 4 /* so_major_id.len */ +
3033                 (XDR_QUADLEN(major_id_sz) * 4) +
3034                 4 /* eir_server_scope.len */ +
3035                 (XDR_QUADLEN(server_scope_sz) * 4) +
3036                 4 /* eir_server_impl_id.count (0) */);
3037
3038         WRITEMEM(&exid->clientid, 8);
3039         WRITE32(exid->seqid);
3040         WRITE32(exid->flags);
3041
3042         /* state_protect4_r. Currently only support SP4_NONE */
3043         BUG_ON(exid->spa_how != SP4_NONE);
3044         WRITE32(exid->spa_how);
3045
3046         /* The server_owner struct */
3047         WRITE64(minor_id);      /* Minor id */
3048         /* major id */
3049         WRITE32(major_id_sz);
3050         WRITEMEM(major_id, major_id_sz);
3051
3052         /* Server scope */
3053         WRITE32(server_scope_sz);
3054         WRITEMEM(server_scope, server_scope_sz);
3055
3056         /* Implementation id */
3057         WRITE32(0);     /* zero length nfs_impl_id4 array */
3058         ADJUST_ARGS();
3059         return 0;
3060 }
3061
3062 static __be32
3063 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3064                             struct nfsd4_create_session *sess)
3065 {
3066         __be32 *p;
3067
3068         if (nfserr)
3069                 return nfserr;
3070
3071         RESERVE_SPACE(24);
3072         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3073         WRITE32(sess->seqid);
3074         WRITE32(sess->flags);
3075         ADJUST_ARGS();
3076
3077         RESERVE_SPACE(28);
3078         WRITE32(0); /* headerpadsz */
3079         WRITE32(sess->fore_channel.maxreq_sz);
3080         WRITE32(sess->fore_channel.maxresp_sz);
3081         WRITE32(sess->fore_channel.maxresp_cached);
3082         WRITE32(sess->fore_channel.maxops);
3083         WRITE32(sess->fore_channel.maxreqs);
3084         WRITE32(sess->fore_channel.nr_rdma_attrs);
3085         ADJUST_ARGS();
3086
3087         if (sess->fore_channel.nr_rdma_attrs) {
3088                 RESERVE_SPACE(4);
3089                 WRITE32(sess->fore_channel.rdma_attrs);
3090                 ADJUST_ARGS();
3091         }
3092
3093         RESERVE_SPACE(28);
3094         WRITE32(0); /* headerpadsz */
3095         WRITE32(sess->back_channel.maxreq_sz);
3096         WRITE32(sess->back_channel.maxresp_sz);
3097         WRITE32(sess->back_channel.maxresp_cached);
3098         WRITE32(sess->back_channel.maxops);
3099         WRITE32(sess->back_channel.maxreqs);
3100         WRITE32(sess->back_channel.nr_rdma_attrs);
3101         ADJUST_ARGS();
3102
3103         if (sess->back_channel.nr_rdma_attrs) {
3104                 RESERVE_SPACE(4);
3105                 WRITE32(sess->back_channel.rdma_attrs);
3106                 ADJUST_ARGS();
3107         }
3108         return 0;
3109 }
3110
3111 static __be32
3112 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3113                              struct nfsd4_destroy_session *destroy_session)
3114 {
3115         return nfserr;
3116 }
3117
3118 static __be32
3119 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3120                       struct nfsd4_sequence *seq)
3121 {
3122         __be32 *p;
3123
3124         if (nfserr)
3125                 return nfserr;
3126
3127         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3128         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3129         WRITE32(seq->seqid);
3130         WRITE32(seq->slotid);
3131         WRITE32(seq->maxslots);
3132         /* For now: target_maxslots = maxslots */
3133         WRITE32(seq->maxslots);
3134         WRITE32(seq->status_flags);
3135
3136         ADJUST_ARGS();
3137         resp->cstate.datap = p; /* DRC cache data pointer */
3138         return 0;
3139 }
3140
3141 static __be32
3142 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3143 {
3144         return nfserr;
3145 }
3146
3147 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3148
3149 /*
3150  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3151  * since we don't need to filter out obsolete ops as this is
3152  * done in the decoding phase.
3153  */
3154 static nfsd4_enc nfsd4_enc_ops[] = {
3155         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3156         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3157         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3158         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3159         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3160         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3161         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3162         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3163         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3164         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3165         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3166         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3167         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3168         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3169         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3170         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3171         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3172         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3173         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3174         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3175         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3176         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3177         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3178         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3179         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3180         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3181         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3182         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3183         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3184         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3185         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3186         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3187         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3188         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3189         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3190         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3191         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3192
3193         /* NFSv4.1 operations */
3194         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3195         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3196         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3197         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3198         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3199         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3200         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3201         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3202         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3203         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3204         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3205         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3206         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3207         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3208         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3209         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3210         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3211         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3212         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3213 };
3214
3215 /*
3216  * Calculate the total amount of memory that the compound response has taken
3217  * after encoding the current operation.
3218  *
3219  * pad: add on 8 bytes for the next operation's op_code and status so that
3220  * there is room to cache a failure on the next operation.
3221  *
3222  * Compare this length to the session se_fmaxresp_cached.
3223  *
3224  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3225  * will be at least a page and will therefore hold the xdr_buf head.
3226  */
3227 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3228 {
3229         int status = 0;
3230         struct xdr_buf *xb = &resp->rqstp->rq_res;
3231         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3232         struct nfsd4_session *session = NULL;
3233         struct nfsd4_slot *slot = resp->cstate.slot;
3234         u32 length, tlen = 0, pad = 8;
3235
3236         if (!nfsd4_has_session(&resp->cstate))
3237                 return status;
3238
3239         session = resp->cstate.session;
3240         if (session == NULL || slot->sl_cachethis == 0)
3241                 return status;
3242
3243         if (resp->opcnt >= args->opcnt)
3244                 pad = 0; /* this is the last operation */
3245
3246         if (xb->page_len == 0) {
3247                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3248         } else {
3249                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3250                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3251
3252                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3253         }
3254         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3255                 length, xb->page_len, tlen, pad);
3256
3257         if (length <= session->se_fchannel.maxresp_cached)
3258                 return status;
3259         else
3260                 return nfserr_rep_too_big_to_cache;
3261 }
3262
3263 void
3264 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3265 {
3266         __be32 *statp;
3267         __be32 *p;
3268
3269         RESERVE_SPACE(8);
3270         WRITE32(op->opnum);
3271         statp = p++;    /* to be backfilled at the end */
3272         ADJUST_ARGS();
3273
3274         if (op->opnum == OP_ILLEGAL)
3275                 goto status;
3276         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3277                !nfsd4_enc_ops[op->opnum]);
3278         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3279         /* nfsd4_check_drc_limit guarantees enough room for error status */
3280         if (!op->status && nfsd4_check_drc_limit(resp))
3281                 op->status = nfserr_rep_too_big_to_cache;
3282 status:
3283         /*
3284          * Note: We write the status directly, instead of using WRITE32(),
3285          * since it is already in network byte order.
3286          */
3287         *statp = op->status;
3288 }
3289
3290 /*
3291  * Encode the reply stored in the stateowner reply cache
3292  *
3293  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3294  * previously sent already encoded operation.
3295  *
3296  * called with nfs4_lock_state() held
3297  */
3298 void
3299 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3300 {
3301         __be32 *p;
3302         struct nfs4_replay *rp = op->replay;
3303
3304         BUG_ON(!rp);
3305
3306         RESERVE_SPACE(8);
3307         WRITE32(op->opnum);
3308         *p++ = rp->rp_status;  /* already xdr'ed */
3309         ADJUST_ARGS();
3310
3311         RESERVE_SPACE(rp->rp_buflen);
3312         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3313         ADJUST_ARGS();
3314 }
3315
3316 int
3317 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3318 {
3319         return xdr_ressize_check(rqstp, p);
3320 }
3321
3322 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3323 {
3324         if (args->ops != args->iops) {
3325                 kfree(args->ops);
3326                 args->ops = args->iops;
3327         }
3328         kfree(args->tmpp);
3329         args->tmpp = NULL;
3330         while (args->to_free) {
3331                 struct tmpbuf *tb = args->to_free;
3332                 args->to_free = tb->next;
3333                 tb->release(tb->buf);
3334                 kfree(tb);
3335         }
3336 }
3337
3338 int
3339 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3340 {
3341         __be32 status;
3342
3343         args->p = p;
3344         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3345         args->pagelist = rqstp->rq_arg.pages;
3346         args->pagelen = rqstp->rq_arg.page_len;
3347         args->tmpp = NULL;
3348         args->to_free = NULL;
3349         args->ops = args->iops;
3350         args->rqstp = rqstp;
3351
3352         status = nfsd4_decode_compound(args);
3353         if (status) {
3354                 nfsd4_release_compoundargs(args);
3355         }
3356         return !status;
3357 }
3358
3359 int
3360 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3361 {
3362         /*
3363          * All that remains is to write the tag and operation count...
3364          */
3365         struct nfsd4_compound_state *cs = &resp->cstate;
3366         struct kvec *iov;
3367         p = resp->tagp;
3368         *p++ = htonl(resp->taglen);
3369         memcpy(p, resp->tag, resp->taglen);
3370         p += XDR_QUADLEN(resp->taglen);
3371         *p++ = htonl(resp->opcnt);
3372
3373         if (rqstp->rq_res.page_len)
3374                 iov = &rqstp->rq_res.tail[0];
3375         else
3376                 iov = &rqstp->rq_res.head[0];
3377         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3378         BUG_ON(iov->iov_len > PAGE_SIZE);
3379         if (nfsd4_has_session(cs)) {
3380                 if (cs->status != nfserr_replay_cache) {
3381                         nfsd4_store_cache_entry(resp);
3382                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3383                         cs->slot->sl_inuse = false;
3384                 }
3385                 /* Renew the clientid on success and on replay */
3386                 release_session_client(cs->session);
3387                 nfsd4_put_session(cs->session);
3388         }
3389         return 1;
3390 }
3391
3392 /*
3393  * Local variables:
3394  *  c-basic-offset: 8
3395  * End:
3396  */