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         u32 dummy;
 428
 429         READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 430         COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 431         READ32(bcts->dir);
 432         /* XXX: Perhaps Tom Tucker could help us figure out how we
 433          * should be using ctsa_use_conn_in_rdma_mode: */
 434         READ32(dummy);
 435
 436         DECODE_TAIL;
 437 }
 438
 439 static __be32
 440 nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 441 {
 442         DECODE_HEAD;
 443
 444         close->cl_stateowner = NULL;
 445         READ_BUF(4);
 446         READ32(close->cl_seqid);
 447         return nfsd4_decode_stateid(argp, &close->cl_stateid);
 448
 449         DECODE_TAIL;
 450 }
 451
 452
 453 static __be32
 454 nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 455 {
 456         DECODE_HEAD;
 457
 458         READ_BUF(12);
 459         READ64(commit->co_offset);
 460         READ32(commit->co_count);
 461
 462         DECODE_TAIL;
 463 }
 464
 465 static __be32
 466 nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 467 {
 468         DECODE_HEAD;
 469
 470         READ_BUF(4);
 471         READ32(create->cr_type);
 472         switch (create->cr_type) {
 473         case NF4LNK:
 474                 READ_BUF(4);
 475                 READ32(create->cr_linklen);
 476                 READ_BUF(create->cr_linklen);
 477                 SAVEMEM(create->cr_linkname, create->cr_linklen);
 478                 break;
 479         case NF4BLK:
 480         case NF4CHR:
 481                 READ_BUF(8);
 482                 READ32(create->cr_specdata1);
 483                 READ32(create->cr_specdata2);
 484                 break;
 485         case NF4SOCK:
 486         case NF4FIFO:
 487         case NF4DIR:
 488         default:
 489                 break;
 490         }
 491
 492         READ_BUF(4);
 493         READ32(create->cr_namelen);
 494         READ_BUF(create->cr_namelen);
 495         SAVEMEM(create->cr_name, create->cr_namelen);
 496         if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 497                 return status;
 498
 499         status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 500                                     &create->cr_acl);
 501         if (status)
 502                 goto out;
 503
 504         DECODE_TAIL;
 505 }
 506
 507 static inline __be32
 508 nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 509 {
 510         return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 511 }
 512
 513 static inline __be32
 514 nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 515 {
 516         return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 517 }
 518
 519 static __be32
 520 nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 521 {
 522         DECODE_HEAD;
 523
 524         READ_BUF(4);
 525         READ32(link->li_namelen);
 526         READ_BUF(link->li_namelen);
 527         SAVEMEM(link->li_name, link->li_namelen);
 528         if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 529                 return status;
 530
 531         DECODE_TAIL;
 532 }
 533
 534 static __be32
 535 nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 536 {
 537         DECODE_HEAD;
 538
 539         lock->lk_replay_owner = NULL;
 540         /*
 541         * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 542         */
 543         READ_BUF(28);
 544         READ32(lock->lk_type);
 545         if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 546                 goto xdr_error;
 547         READ32(lock->lk_reclaim);
 548         READ64(lock->lk_offset);
 549         READ64(lock->lk_length);
 550         READ32(lock->lk_is_new);
 551
 552         if (lock->lk_is_new) {
 553                 READ_BUF(4);
 554                 READ32(lock->lk_new_open_seqid);
 555                 status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 556                 if (status)
 557                         return status;
 558                 READ_BUF(8 + sizeof(clientid_t));
 559                 READ32(lock->lk_new_lock_seqid);
 560                 COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 561                 READ32(lock->lk_new_owner.len);
 562                 READ_BUF(lock->lk_new_owner.len);
 563                 READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 564         } else {
 565                 status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 566                 if (status)
 567                         return status;
 568                 READ_BUF(4);
 569                 READ32(lock->lk_old_lock_seqid);
 570         }
 571
 572         DECODE_TAIL;
 573 }
 574
 575 static __be32
 576 nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 577 {
 578         DECODE_HEAD;
 579
 580         READ_BUF(32);
 581         READ32(lockt->lt_type);
 582         if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 583                 goto xdr_error;
 584         READ64(lockt->lt_offset);
 585         READ64(lockt->lt_length);
 586         COPYMEM(&lockt->lt_clientid, 8);
 587         READ32(lockt->lt_owner.len);
 588         READ_BUF(lockt->lt_owner.len);
 589         READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 590
 591         if (argp->minorversion && !zero_clientid(&lockt->lt_clientid))
 592                 return nfserr_inval;
 593         DECODE_TAIL;
 594 }
 595
 596 static __be32
 597 nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 598 {
 599         DECODE_HEAD;
 600
 601         locku->lu_stateowner = NULL;
 602         READ_BUF(8);
 603         READ32(locku->lu_type);
 604         if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 605                 goto xdr_error;
 606         READ32(locku->lu_seqid);
 607         status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 608         if (status)
 609                 return status;
 610         READ_BUF(16);
 611         READ64(locku->lu_offset);
 612         READ64(locku->lu_length);
 613
 614         DECODE_TAIL;
 615 }
 616
 617 static __be32
 618 nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 619 {
 620         DECODE_HEAD;
 621
 622         READ_BUF(4);
 623         READ32(lookup->lo_len);
 624         READ_BUF(lookup->lo_len);
 625         SAVEMEM(lookup->lo_name, lookup->lo_len);
 626         if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 627                 return status;
 628
 629         DECODE_TAIL;
 630 }
 631
 632 static __be32
 633 nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 634 {
 635         DECODE_HEAD;
 636
 637         memset(open->op_bmval, 0, sizeof(open->op_bmval));
 638         open->op_iattr.ia_valid = 0;
 639         open->op_stateowner = NULL;
 640
 641         /* seqid, share_access, share_deny, clientid, ownerlen */
 642         READ_BUF(16 + sizeof(clientid_t));
 643         READ32(open->op_seqid);
 644         READ32(open->op_share_access);
 645         READ32(open->op_share_deny);
 646         COPYMEM(&open->op_clientid, sizeof(clientid_t));
 647         READ32(open->op_owner.len);
 648
 649         /* owner, open_flag */
 650         READ_BUF(open->op_owner.len + 4);
 651         SAVEMEM(open->op_owner.data, open->op_owner.len);
 652         READ32(open->op_create);
 653         switch (open->op_create) {
 654         case NFS4_OPEN_NOCREATE:
 655                 break;
 656         case NFS4_OPEN_CREATE:
 657                 READ_BUF(4);
 658                 READ32(open->op_createmode);
 659                 switch (open->op_createmode) {
 660                 case NFS4_CREATE_UNCHECKED:
 661                 case NFS4_CREATE_GUARDED:
 662                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 663                                 &open->op_iattr, &open->op_acl);
 664                         if (status)
 665                                 goto out;
 666                         break;
 667                 case NFS4_CREATE_EXCLUSIVE:
 668                         READ_BUF(8);
 669                         COPYMEM(open->op_verf.data, 8);
 670                         break;
 671                 case NFS4_CREATE_EXCLUSIVE4_1:
 672                         if (argp->minorversion < 1)
 673                                 goto xdr_error;
 674                         READ_BUF(8);
 675                         COPYMEM(open->op_verf.data, 8);
 676                         status = nfsd4_decode_fattr(argp, open->op_bmval,
 677                                 &open->op_iattr, &open->op_acl);
 678                         if (status)
 679                                 goto out;
 680                         break;
 681                 default:
 682                         goto xdr_error;
 683                 }
 684                 break;
 685         default:
 686                 goto xdr_error;
 687         }
 688
 689         /* open_claim */
 690         READ_BUF(4);
 691         READ32(open->op_claim_type);
 692         switch (open->op_claim_type) {
 693         case NFS4_OPEN_CLAIM_NULL:
 694         case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 695                 READ_BUF(4);
 696                 READ32(open->op_fname.len);
 697                 READ_BUF(open->op_fname.len);
 698                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 699                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 700                         return status;
 701                 break;
 702         case NFS4_OPEN_CLAIM_PREVIOUS:
 703                 READ_BUF(4);
 704                 READ32(open->op_delegate_type);
 705                 break;
 706         case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 707                 status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 708                 if (status)
 709                         return status;
 710                 READ_BUF(4);
 711                 READ32(open->op_fname.len);
 712                 READ_BUF(open->op_fname.len);
 713                 SAVEMEM(open->op_fname.data, open->op_fname.len);
 714                 if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 715                         return status;
 716                 break;
 717         default:
 718                 goto xdr_error;
 719         }
 720
 721         DECODE_TAIL;
 722 }
 723
 724 static __be32
 725 nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 726 {
 727         DECODE_HEAD;
 728
 729         open_conf->oc_stateowner = NULL;
 730         status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 731         if (status)
 732                 return status;
 733         READ_BUF(4);
 734         READ32(open_conf->oc_seqid);
 735
 736         DECODE_TAIL;
 737 }
 738
 739 static __be32
 740 nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 741 {
 742         DECODE_HEAD;
 743
 744         open_down->od_stateowner = NULL;
 745         status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 746         if (status)
 747                 return status;
 748         READ_BUF(12);
 749         READ32(open_down->od_seqid);
 750         READ32(open_down->od_share_access);
 751         READ32(open_down->od_share_deny);
 752
 753         DECODE_TAIL;
 754 }
 755
 756 static __be32
 757 nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 758 {
 759         DECODE_HEAD;
 760
 761         READ_BUF(4);
 762         READ32(putfh->pf_fhlen);
 763         if (putfh->pf_fhlen > NFS4_FHSIZE)
 764                 goto xdr_error;
 765         READ_BUF(putfh->pf_fhlen);
 766         SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 767
 768         DECODE_TAIL;
 769 }
 770
 771 static __be32
 772 nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 773 {
 774         DECODE_HEAD;
 775
 776         status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 777         if (status)
 778                 return status;
 779         READ_BUF(12);
 780         READ64(read->rd_offset);
 781         READ32(read->rd_length);
 782
 783         DECODE_TAIL;
 784 }
 785
 786 static __be32
 787 nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 788 {
 789         DECODE_HEAD;
 790
 791         READ_BUF(24);
 792         READ64(readdir->rd_cookie);
 793         COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 794         READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 795         READ32(readdir->rd_maxcount);
 796         if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 797                 goto out;
 798
 799         DECODE_TAIL;
 800 }
 801
 802 static __be32
 803 nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 804 {
 805         DECODE_HEAD;
 806
 807         READ_BUF(4);
 808         READ32(remove->rm_namelen);
 809         READ_BUF(remove->rm_namelen);
 810         SAVEMEM(remove->rm_name, remove->rm_namelen);
 811         if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 812                 return status;
 813
 814         DECODE_TAIL;
 815 }
 816
 817 static __be32
 818 nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 819 {
 820         DECODE_HEAD;
 821
 822         READ_BUF(4);
 823         READ32(rename->rn_snamelen);
 824         READ_BUF(rename->rn_snamelen + 4);
 825         SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 826         READ32(rename->rn_tnamelen);
 827         READ_BUF(rename->rn_tnamelen);
 828         SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 829         if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 830                 return status;
 831         if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 832                 return status;
 833
 834         DECODE_TAIL;
 835 }
 836
 837 static __be32
 838 nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 839 {
 840         DECODE_HEAD;
 841
 842         READ_BUF(sizeof(clientid_t));
 843         COPYMEM(clientid, sizeof(clientid_t));
 844
 845         DECODE_TAIL;
 846 }
 847
 848 static __be32
 849 nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 850                      struct nfsd4_secinfo *secinfo)
 851 {
 852         DECODE_HEAD;
 853
 854         READ_BUF(4);
 855         READ32(secinfo->si_namelen);
 856         READ_BUF(secinfo->si_namelen);
 857         SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 858         status = check_filename(secinfo->si_name, secinfo->si_namelen,
 859                                                                 nfserr_noent);
 860         if (status)
 861                 return status;
 862         DECODE_TAIL;
 863 }
 864
 865 static __be32
 866 nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
 867                      struct nfsd4_secinfo_no_name *sin)
 868 {
 869         DECODE_HEAD;
 870
 871         READ_BUF(4);
 872         READ32(sin->sin_style);
 873         DECODE_TAIL;
 874 }
 875
 876 static __be32
 877 nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 878 {
 879         __be32 status;
 880
 881         status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 882         if (status)
 883                 return status;
 884         return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 885                                   &setattr->sa_acl);
 886 }
 887
 888 static __be32
 889 nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 890 {
 891         DECODE_HEAD;
 892
 893         READ_BUF(12);
 894         COPYMEM(setclientid->se_verf.data, 8);
 895         READ32(setclientid->se_namelen);
 896
 897         READ_BUF(setclientid->se_namelen + 8);
 898         SAVEMEM(setclientid->se_name, setclientid->se_namelen);
 899         READ32(setclientid->se_callback_prog);
 900         READ32(setclientid->se_callback_netid_len);
 901
 902         READ_BUF(setclientid->se_callback_netid_len + 4);
 903         SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
 904         READ32(setclientid->se_callback_addr_len);
 905
 906         READ_BUF(setclientid->se_callback_addr_len + 4);
 907         SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
 908         READ32(setclientid->se_callback_ident);
 909
 910         DECODE_TAIL;
 911 }
 912
 913 static __be32
 914 nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
 915 {
 916         DECODE_HEAD;
 917
 918         READ_BUF(8 + sizeof(nfs4_verifier));
 919         COPYMEM(&scd_c->sc_clientid, 8);
 920         COPYMEM(&scd_c->sc_confirm, sizeof(nfs4_verifier));
 921
 922         DECODE_TAIL;
 923 }
 924
 925 /* Also used for NVERIFY */
 926 static __be32
 927 nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
 928 {
 929 #if 0
 930         struct nfsd4_compoundargs save = {
 931                 .p = argp->p,
 932                 .end = argp->end,
 933                 .rqstp = argp->rqstp,
 934         };
 935         u32             ve_bmval[2];
 936         struct iattr    ve_iattr;           /* request */
 937         struct nfs4_acl *ve_acl;            /* request */
 938 #endif
 939         DECODE_HEAD;
 940
 941         if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
 942                 goto out;
 943
 944         /* For convenience's sake, we compare raw xdr'd attributes in
 945          * nfsd4_proc_verify; however we still decode here just to return
 946          * correct error in case of bad xdr. */
 947 #if 0
 948         status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
 949         if (status == nfserr_inval) {
 950                 status = nfserrno(status);
 951                 goto out;
 952         }
 953 #endif
 954         READ_BUF(4);
 955         READ32(verify->ve_attrlen);
 956         READ_BUF(verify->ve_attrlen);
 957         SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
 958
 959         DECODE_TAIL;
 960 }
 961
 962 static __be32
 963 nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
 964 {
 965         int avail;
 966         int v;
 967         int len;
 968         DECODE_HEAD;
 969
 970         status = nfsd4_decode_stateid(argp, &write->wr_stateid);
 971         if (status)
 972                 return status;
 973         READ_BUF(16);
 974         READ64(write->wr_offset);
 975         READ32(write->wr_stable_how);
 976         if (write->wr_stable_how > 2)
 977                 goto xdr_error;
 978         READ32(write->wr_buflen);
 979
 980         /* Sorry .. no magic macros for this.. *
 981          * READ_BUF(write->wr_buflen);
 982          * SAVEMEM(write->wr_buf, write->wr_buflen);
 983          */
 984         avail = (char*)argp->end - (char*)argp->p;
 985         if (avail + argp->pagelen < write->wr_buflen) {
 986                 dprintk("NFSD: xdr error (%s:%d)\n",
 987                                 __FILE__, __LINE__);
 988                 goto xdr_error;
 989         }
 990         argp->rqstp->rq_vec[0].iov_base = p;
 991         argp->rqstp->rq_vec[0].iov_len = avail;
 992         v = 0;
 993         len = write->wr_buflen;
 994         while (len > argp->rqstp->rq_vec[v].iov_len) {
 995                 len -= argp->rqstp->rq_vec[v].iov_len;
 996                 v++;
 997                 argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
 998                 argp->pagelist++;
 999                 if (argp->pagelen >= PAGE_SIZE) {
1000                         argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1001                         argp->pagelen -= PAGE_SIZE;
1002                 } else {
1003                         argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1004                         argp->pagelen -= len;
1005                 }
1006         }
1007         argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1008         argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1009         argp->rqstp->rq_vec[v].iov_len = len;
1010         write->wr_vlen = v+1;
1011
1012         DECODE_TAIL;
1013 }
1014
1015 static __be32
1016 nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1017 {
1018         DECODE_HEAD;
1019
1020         READ_BUF(12);
1021         COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1022         READ32(rlockowner->rl_owner.len);
1023         READ_BUF(rlockowner->rl_owner.len);
1024         READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1025
1026         if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1027                 return nfserr_inval;
1028         DECODE_TAIL;
1029 }
1030
1031 static __be32
1032 nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1033                          struct nfsd4_exchange_id *exid)
1034 {
1035         int dummy, tmp;
1036         DECODE_HEAD;
1037
1038         READ_BUF(NFS4_VERIFIER_SIZE);
1039         COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1040
1041         READ_BUF(4);
1042         READ32(exid->clname.len);
1043
1044         READ_BUF(exid->clname.len);
1045         SAVEMEM(exid->clname.data, exid->clname.len);
1046
1047         READ_BUF(4);
1048         READ32(exid->flags);
1049
1050         /* Ignore state_protect4_a */
1051         READ_BUF(4);
1052         READ32(exid->spa_how);
1053         switch (exid->spa_how) {
1054         case SP4_NONE:
1055                 break;
1056         case SP4_MACH_CRED:
1057                 /* spo_must_enforce */
1058                 READ_BUF(4);
1059                 READ32(dummy);
1060                 READ_BUF(dummy * 4);
1061                 p += dummy;
1062
1063                 /* spo_must_allow */
1064                 READ_BUF(4);
1065                 READ32(dummy);
1066                 READ_BUF(dummy * 4);
1067                 p += dummy;
1068                 break;
1069         case SP4_SSV:
1070                 /* ssp_ops */
1071                 READ_BUF(4);
1072                 READ32(dummy);
1073                 READ_BUF(dummy * 4);
1074                 p += dummy;
1075
1076                 READ_BUF(4);
1077                 READ32(dummy);
1078                 READ_BUF(dummy * 4);
1079                 p += dummy;
1080
1081                 /* ssp_hash_algs<> */
1082                 READ_BUF(4);
1083                 READ32(tmp);
1084                 while (tmp--) {
1085                         READ_BUF(4);
1086                         READ32(dummy);
1087                         READ_BUF(dummy);
1088                         p += XDR_QUADLEN(dummy);
1089                 }
1090
1091                 /* ssp_encr_algs<> */
1092                 READ_BUF(4);
1093                 READ32(tmp);
1094                 while (tmp--) {
1095                         READ_BUF(4);
1096                         READ32(dummy);
1097                         READ_BUF(dummy);
1098                         p += XDR_QUADLEN(dummy);
1099                 }
1100
1101                 /* ssp_window and ssp_num_gss_handles */
1102                 READ_BUF(8);
1103                 READ32(dummy);
1104                 READ32(dummy);
1105                 break;
1106         default:
1107                 goto xdr_error;
1108         }
1109
1110         /* Ignore Implementation ID */
1111         READ_BUF(4);    /* nfs_impl_id4 array length */
1112         READ32(dummy);
1113
1114         if (dummy > 1)
1115                 goto xdr_error;
1116
1117         if (dummy == 1) {
1118                 /* nii_domain */
1119                 READ_BUF(4);
1120                 READ32(dummy);
1121                 READ_BUF(dummy);
1122                 p += XDR_QUADLEN(dummy);
1123
1124                 /* nii_name */
1125                 READ_BUF(4);
1126                 READ32(dummy);
1127                 READ_BUF(dummy);
1128                 p += XDR_QUADLEN(dummy);
1129
1130                 /* nii_date */
1131                 READ_BUF(12);
1132                 p += 3;
1133         }
1134         DECODE_TAIL;
1135 }
1136
1137 static __be32
1138 nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1139                             struct nfsd4_create_session *sess)
1140 {
1141         DECODE_HEAD;
1142
1143         u32 dummy;
1144         char *machine_name;
1145         int i, j;
1146         int nr_secflavs;
1147
1148         READ_BUF(16);
1149         COPYMEM(&sess->clientid, 8);
1150         READ32(sess->seqid);
1151         READ32(sess->flags);
1152
1153         /* Fore channel attrs */
1154         READ_BUF(28);
1155         READ32(dummy); /* headerpadsz is always 0 */
1156         READ32(sess->fore_channel.maxreq_sz);
1157         READ32(sess->fore_channel.maxresp_sz);
1158         READ32(sess->fore_channel.maxresp_cached);
1159         READ32(sess->fore_channel.maxops);
1160         READ32(sess->fore_channel.maxreqs);
1161         READ32(sess->fore_channel.nr_rdma_attrs);
1162         if (sess->fore_channel.nr_rdma_attrs == 1) {
1163                 READ_BUF(4);
1164                 READ32(sess->fore_channel.rdma_attrs);
1165         } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1166                 dprintk("Too many fore channel attr bitmaps!\n");
1167                 goto xdr_error;
1168         }
1169
1170         /* Back channel attrs */
1171         READ_BUF(28);
1172         READ32(dummy); /* headerpadsz is always 0 */
1173         READ32(sess->back_channel.maxreq_sz);
1174         READ32(sess->back_channel.maxresp_sz);
1175         READ32(sess->back_channel.maxresp_cached);
1176         READ32(sess->back_channel.maxops);
1177         READ32(sess->back_channel.maxreqs);
1178         READ32(sess->back_channel.nr_rdma_attrs);
1179         if (sess->back_channel.nr_rdma_attrs == 1) {
1180                 READ_BUF(4);
1181                 READ32(sess->back_channel.rdma_attrs);
1182         } else if (sess->back_channel.nr_rdma_attrs > 1) {
1183                 dprintk("Too many back channel attr bitmaps!\n");
1184                 goto xdr_error;
1185         }
1186
1187         READ_BUF(8);
1188         READ32(sess->callback_prog);
1189
1190         /* callback_sec_params4 */
1191         READ32(nr_secflavs);
1192         for (i = 0; i < nr_secflavs; ++i) {
1193                 READ_BUF(4);
1194                 READ32(dummy);
1195                 switch (dummy) {
1196                 case RPC_AUTH_NULL:
1197                         /* Nothing to read */
1198                         break;
1199                 case RPC_AUTH_UNIX:
1200                         READ_BUF(8);
1201                         /* stamp */
1202                         READ32(dummy);
1203
1204                         /* machine name */
1205                         READ32(dummy);
1206                         READ_BUF(dummy);
1207                         SAVEMEM(machine_name, dummy);
1208
1209                         /* uid, gid */
1210                         READ_BUF(8);
1211                         READ32(sess->uid);
1212                         READ32(sess->gid);
1213
1214                         /* more gids */
1215                         READ_BUF(4);
1216                         READ32(dummy);
1217                         READ_BUF(dummy * 4);
1218                         for (j = 0; j < dummy; ++j)
1219                                 READ32(dummy);
1220                         break;
1221                 case RPC_AUTH_GSS:
1222                         dprintk("RPC_AUTH_GSS callback secflavor "
1223                                 "not supported!\n");
1224                         READ_BUF(8);
1225                         /* gcbp_service */
1226                         READ32(dummy);
1227                         /* gcbp_handle_from_server */
1228                         READ32(dummy);
1229                         READ_BUF(dummy);
1230                         p += XDR_QUADLEN(dummy);
1231                         /* gcbp_handle_from_client */
1232                         READ_BUF(4);
1233                         READ32(dummy);
1234                         READ_BUF(dummy);
1235                         p += XDR_QUADLEN(dummy);
1236                         break;
1237                 default:
1238                         dprintk("Illegal callback secflavor\n");
1239                         return nfserr_inval;
1240                 }
1241         }
1242         DECODE_TAIL;
1243 }
1244
1245 static __be32
1246 nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1247                              struct nfsd4_destroy_session *destroy_session)
1248 {
1249         DECODE_HEAD;
1250         READ_BUF(NFS4_MAX_SESSIONID_LEN);
1251         COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1252
1253         DECODE_TAIL;
1254 }
1255
1256 static __be32
1257 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1258                       struct nfsd4_sequence *seq)
1259 {
1260         DECODE_HEAD;
1261
1262         READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1263         COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1264         READ32(seq->seqid);
1265         READ32(seq->slotid);
1266         READ32(seq->maxslots);
1267         READ32(seq->cachethis);
1268
1269         DECODE_TAIL;
1270 }
1271
1272 static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1273 {
1274         DECODE_HEAD;
1275
1276         READ_BUF(4);
1277         READ32(rc->rca_one_fs);
1278
1279         DECODE_TAIL;
1280 }
1281
1282 static __be32
1283 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1284 {
1285         return nfs_ok;
1286 }
1287
1288 static __be32
1289 nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1290 {
1291         return nfserr_notsupp;
1292 }
1293
1294 typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1295
1296 static nfsd4_dec nfsd4_dec_ops[] = {
1297         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1298         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1299         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1300         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1301         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1302         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1303         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1304         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1305         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1306         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1307         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1308         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1309         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1310         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1311         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1312         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1313         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1314         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1315         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1316         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1317         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1318         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1319         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1320         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1321         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1322         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1323         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1324         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1325         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1326         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1327         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1328         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1329         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1330         [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1331         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1332         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1333         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1334 };
1335
1336 static nfsd4_dec nfsd41_dec_ops[] = {
1337         [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1338         [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1339         [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1340         [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1341         [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1342         [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1343         [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1344         [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1345         [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1346         [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1347         [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1348         [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1349         [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1350         [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1351         [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1352         [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1353         [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1354         [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1355         [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1356         [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1357         [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1358         [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1359         [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1360         [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1361         [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1362         [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1363         [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1364         [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1365         [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1366         [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1367         [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1368         [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1369         [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1370         [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1371         [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1372         [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1373         [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1374
1375         /* new operations for NFSv4.1 */
1376         [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1377         [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1378         [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1379         [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1380         [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1381         [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1382         [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1383         [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1384         [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1385         [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1386         [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1387         [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1388         [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1389         [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1390         [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1391         [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_notsupp,
1392         [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1393         [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_notsupp,
1394         [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1395 };
1396
1397 struct nfsd4_minorversion_ops {
1398         nfsd4_dec *decoders;
1399         int nops;
1400 };
1401
1402 static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1403         [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1404         [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1405 };
1406
1407 static __be32
1408 nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1409 {
1410         DECODE_HEAD;
1411         struct nfsd4_op *op;
1412         struct nfsd4_minorversion_ops *ops;
1413         int i;
1414
1415         /*
1416          * XXX: According to spec, we should check the tag
1417          * for UTF-8 compliance.  I'm postponing this for
1418          * now because it seems that some clients do use
1419          * binary tags.
1420          */
1421         READ_BUF(4);
1422         READ32(argp->taglen);
1423         READ_BUF(argp->taglen + 8);
1424         SAVEMEM(argp->tag, argp->taglen);
1425         READ32(argp->minorversion);
1426         READ32(argp->opcnt);
1427
1428         if (argp->taglen > NFSD4_MAX_TAGLEN)
1429                 goto xdr_error;
1430         if (argp->opcnt > 100)
1431                 goto xdr_error;
1432
1433         if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1434                 argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1435                 if (!argp->ops) {
1436                         argp->ops = argp->iops;
1437                         dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1438                         goto xdr_error;
1439                 }
1440         }
1441
1442         if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1443                 argp->opcnt = 0;
1444
1445         ops = &nfsd4_minorversion[argp->minorversion];
1446         for (i = 0; i < argp->opcnt; i++) {
1447                 op = &argp->ops[i];
1448                 op->replay = NULL;
1449
1450                 /*
1451                  * We can't use READ_BUF() here because we need to handle
1452                  * a missing opcode as an OP_WRITE + 1. So we need to check
1453                  * to see if we're truly at the end of our buffer or if there
1454                  * is another page we need to flip to.
1455                  */
1456
1457                 if (argp->p == argp->end) {
1458                         if (argp->pagelen < 4) {
1459                                 /* There isn't an opcode still on the wire */
1460                                 op->opnum = OP_WRITE + 1;
1461                                 op->status = nfserr_bad_xdr;
1462                                 argp->opcnt = i+1;
1463                                 break;
1464                         }
1465
1466                         /*
1467                          * False alarm. We just hit a page boundary, but there
1468                          * is still data available.  Move pointer across page
1469                          * boundary.  *snip from READ_BUF*
1470                          */
1471                         argp->p = page_address(argp->pagelist[0]);
1472                         argp->pagelist++;
1473                         if (argp->pagelen < PAGE_SIZE) {
1474                                 argp->end = argp->p + (argp->pagelen>>2);
1475                                 argp->pagelen = 0;
1476                         } else {
1477                                 argp->end = argp->p + (PAGE_SIZE>>2);
1478                                 argp->pagelen -= PAGE_SIZE;
1479                         }
1480                 }
1481                 op->opnum = ntohl(*argp->p++);
1482
1483                 if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1484                         op->status = ops->decoders[op->opnum](argp, &op->u);
1485                 else {
1486                         op->opnum = OP_ILLEGAL;
1487                         op->status = nfserr_op_illegal;
1488                 }
1489
1490                 if (op->status) {
1491                         argp->opcnt = i+1;
1492                         break;
1493                 }
1494         }
1495
1496         DECODE_TAIL;
1497 }
1498
1499 #define WRITE32(n)               *p++ = htonl(n)
1500 #define WRITE64(n)               do {                           \
1501         *p++ = htonl((u32)((n) >> 32));                         \
1502         *p++ = htonl((u32)(n));                                 \
1503 } while (0)
1504 #define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1505         *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1506         memcpy(p, ptr, nbytes);                                 \
1507         p += XDR_QUADLEN(nbytes);                               \
1508 }} while (0)
1509
1510 static void write32(__be32 **p, u32 n)
1511 {
1512         *(*p)++ = n;
1513 }
1514
1515 static void write64(__be32 **p, u64 n)
1516 {
1517         write32(p, (u32)(n >> 32));
1518         write32(p, (u32)n);
1519 }
1520
1521 static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1522 {
1523         if (IS_I_VERSION(inode)) {
1524                 write64(p, inode->i_version);
1525         } else {
1526                 write32(p, stat->ctime.tv_sec);
1527                 write32(p, stat->ctime.tv_nsec);
1528         }
1529 }
1530
1531 static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1532 {
1533         write32(p, c->atomic);
1534         if (c->change_supported) {
1535                 write64(p, c->before_change);
1536                 write64(p, c->after_change);
1537         } else {
1538                 write32(p, c->before_ctime_sec);
1539                 write32(p, c->before_ctime_nsec);
1540                 write32(p, c->after_ctime_sec);
1541                 write32(p, c->after_ctime_nsec);
1542         }
1543 }
1544
1545 #define RESERVE_SPACE(nbytes)   do {                            \
1546         p = resp->p;                                            \
1547         BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1548 } while (0)
1549 #define ADJUST_ARGS()           resp->p = p
1550
1551 /*
1552  * Header routine to setup seqid operation replay cache
1553  */
1554 #define ENCODE_SEQID_OP_HEAD                                    \
1555         __be32 *save;                                           \
1556                                                                 \
1557         save = resp->p;
1558
1559 /*
1560  * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1561  * is where sequence id's are incremented, and the replay cache is filled.
1562  * Note that we increment sequence id's here, at the last moment, so we're sure
1563  * we know whether the error to be returned is a sequence id mutating error.
1564  */
1565
1566 #define ENCODE_SEQID_OP_TAIL(stateowner) do {                   \
1567         if (seqid_mutating_err(nfserr) && stateowner) {         \
1568                 stateowner->so_seqid++;                         \
1569                 stateowner->so_replay.rp_status = nfserr;       \
1570                 stateowner->so_replay.rp_buflen =               \
1571                           (((char *)(resp)->p - (char *)save)); \
1572                 memcpy(stateowner->so_replay.rp_buf, save,      \
1573                         stateowner->so_replay.rp_buflen);       \
1574         } } while (0);
1575
1576 /* Encode as an array of strings the string given with components
1577  * separated @sep.
1578  */
1579 static __be32 nfsd4_encode_components(char sep, char *components,
1580                                    __be32 **pp, int *buflen)
1581 {
1582         __be32 *p = *pp;
1583         __be32 *countp = p;
1584         int strlen, count=0;
1585         char *str, *end;
1586
1587         dprintk("nfsd4_encode_components(%s)\n", components);
1588         if ((*buflen -= 4) < 0)
1589                 return nfserr_resource;
1590         WRITE32(0); /* We will fill this in with @count later */
1591         end = str = components;
1592         while (*end) {
1593                 for (; *end && (*end != sep); end++)
1594                         ; /* Point to end of component */
1595                 strlen = end - str;
1596                 if (strlen) {
1597                         if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1598                                 return nfserr_resource;
1599                         WRITE32(strlen);
1600                         WRITEMEM(str, strlen);
1601                         count++;
1602                 }
1603                 else
1604                         end++;
1605                 str = end;
1606         }
1607         *pp = p;
1608         p = countp;
1609         WRITE32(count);
1610         return 0;
1611 }
1612
1613 /*
1614  * encode a location element of a fs_locations structure
1615  */
1616 static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1617                                     __be32 **pp, int *buflen)
1618 {
1619         __be32 status;
1620         __be32 *p = *pp;
1621
1622         status = nfsd4_encode_components(':', location->hosts, &p, buflen);
1623         if (status)
1624                 return status;
1625         status = nfsd4_encode_components('/', location->path, &p, buflen);
1626         if (status)
1627                 return status;
1628         *pp = p;
1629         return 0;
1630 }
1631
1632 /*
1633  * Return the path to an export point in the pseudo filesystem namespace
1634  * Returned string is safe to use as long as the caller holds a reference
1635  * to @exp.
1636  */
1637 static char *nfsd4_path(struct svc_rqst *rqstp, struct svc_export *exp, __be32 *stat)
1638 {
1639         struct svc_fh tmp_fh;
1640         char *path = NULL, *rootpath;
1641         size_t rootlen;
1642
1643         fh_init(&tmp_fh, NFS4_FHSIZE);
1644         *stat = exp_pseudoroot(rqstp, &tmp_fh);
1645         if (*stat)
1646                 return NULL;
1647         rootpath = tmp_fh.fh_export->ex_pathname;
1648
1649         path = exp->ex_pathname;
1650
1651         rootlen = strlen(rootpath);
1652         if (strncmp(path, rootpath, rootlen)) {
1653                 dprintk("nfsd: fs_locations failed;"
1654                         "%s is not contained in %s\n", path, rootpath);
1655                 *stat = nfserr_notsupp;
1656                 path = NULL;
1657                 goto out;
1658         }
1659         path += rootlen;
1660 out:
1661         fh_put(&tmp_fh);
1662         return path;
1663 }
1664
1665 /*
1666  *  encode a fs_locations structure
1667  */
1668 static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1669                                      struct svc_export *exp,
1670                                      __be32 **pp, int *buflen)
1671 {
1672         __be32 status;
1673         int i;
1674         __be32 *p = *pp;
1675         struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1676         char *root = nfsd4_path(rqstp, exp, &status);
1677
1678         if (status)
1679                 return status;
1680         status = nfsd4_encode_components('/', root, &p, buflen);
1681         if (status)
1682                 return status;
1683         if ((*buflen -= 4) < 0)
1684                 return nfserr_resource;
1685         WRITE32(fslocs->locations_count);
1686         for (i=0; i<fslocs->locations_count; i++) {
1687                 status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1688                                                    &p, buflen);
1689                 if (status)
1690                         return status;
1691         }
1692         *pp = p;
1693         return 0;
1694 }
1695
1696 static u32 nfs4_ftypes[16] = {
1697         NF4BAD,  NF4FIFO, NF4CHR, NF4BAD,
1698         NF4DIR,  NF4BAD,  NF4BLK, NF4BAD,
1699         NF4REG,  NF4BAD,  NF4LNK, NF4BAD,
1700         NF4SOCK, NF4BAD,  NF4LNK, NF4BAD,
1701 };
1702
1703 static __be32
1704 nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1705                         __be32 **p, int *buflen)
1706 {
1707         int status;
1708
1709         if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1710                 return nfserr_resource;
1711         if (whotype != NFS4_ACL_WHO_NAMED)
1712                 status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1713         else if (group)
1714                 status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1715         else
1716                 status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1717         if (status < 0)
1718                 return nfserrno(status);
1719         *p = xdr_encode_opaque(*p, NULL, status);
1720         *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1721         BUG_ON(*buflen < 0);
1722         return 0;
1723 }
1724
1725 static inline __be32
1726 nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1727 {
1728         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1729 }
1730
1731 static inline __be32
1732 nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1733 {
1734         return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1735 }
1736
1737 static inline __be32
1738 nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1739                 __be32 **p, int *buflen)
1740 {
1741         return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1742 }
1743
1744 #define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1745                               FATTR4_WORD0_RDATTR_ERROR)
1746 #define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
1747
1748 static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
1749 {
1750         /* As per referral draft:  */
1751         if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
1752             *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
1753                 if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
1754                     *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
1755                         *rdattr_err = NFSERR_MOVED;
1756                 else
1757                         return nfserr_moved;
1758         }
1759         *bmval0 &= WORD0_ABSENT_FS_ATTRS;
1760         *bmval1 &= WORD1_ABSENT_FS_ATTRS;
1761         return 0;
1762 }
1763
1764 /*
1765  * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
1766  * ourselves.
1767  *
1768  * @countp is the buffer size in _words_; upon successful return this becomes
1769  * replaced with the number of words written.
1770  */
1771 __be32
1772 nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
1773                 struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
1774                 struct svc_rqst *rqstp, int ignore_crossmnt)
1775 {
1776         u32 bmval0 = bmval[0];
1777         u32 bmval1 = bmval[1];
1778         u32 bmval2 = bmval[2];
1779         struct kstat stat;
1780         struct svc_fh tempfh;
1781         struct kstatfs statfs;
1782         int buflen = *countp << 2;
1783         __be32 *attrlenp;
1784         u32 dummy;
1785         u64 dummy64;
1786         u32 rdattr_err = 0;
1787         __be32 *p = buffer;
1788         __be32 status;
1789         int err;
1790         int aclsupport = 0;
1791         struct nfs4_acl *acl = NULL;
1792         struct nfsd4_compoundres *resp = rqstp->rq_resp;
1793         u32 minorversion = resp->cstate.minorversion;
1794         struct path path = {
1795                 .mnt    = exp->ex_path.mnt,
1796                 .dentry = dentry,
1797         };
1798
1799         BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
1800         BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
1801         BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
1802         BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
1803
1804         if (exp->ex_fslocs.migrated) {
1805                 BUG_ON(bmval[2]);
1806                 status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
1807                 if (status)
1808                         goto out;
1809         }
1810
1811         err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
1812         if (err)
1813                 goto out_nfserr;
1814         if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
1815                         FATTR4_WORD0_MAXNAME)) ||
1816             (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
1817                        FATTR4_WORD1_SPACE_TOTAL))) {
1818                 err = vfs_statfs(&path, &statfs);
1819                 if (err)
1820                         goto out_nfserr;
1821         }
1822         if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
1823                 fh_init(&tempfh, NFS4_FHSIZE);
1824                 status = fh_compose(&tempfh, exp, dentry, NULL);
1825                 if (status)
1826                         goto out;
1827                 fhp = &tempfh;
1828         }
1829         if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
1830                         | FATTR4_WORD0_SUPPORTED_ATTRS)) {
1831                 err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
1832                 aclsupport = (err == 0);
1833                 if (bmval0 & FATTR4_WORD0_ACL) {
1834                         if (err == -EOPNOTSUPP)
1835                                 bmval0 &= ~FATTR4_WORD0_ACL;
1836                         else if (err == -EINVAL) {
1837                                 status = nfserr_attrnotsupp;
1838                                 goto out;
1839                         } else if (err != 0)
1840                                 goto out_nfserr;
1841                 }
1842         }
1843
1844         if (bmval2) {
1845                 if ((buflen -= 16) < 0)
1846                         goto out_resource;
1847                 WRITE32(3);
1848                 WRITE32(bmval0);
1849                 WRITE32(bmval1);
1850                 WRITE32(bmval2);
1851         } else if (bmval1) {
1852                 if ((buflen -= 12) < 0)
1853                         goto out_resource;
1854                 WRITE32(2);
1855                 WRITE32(bmval0);
1856                 WRITE32(bmval1);
1857         } else {
1858                 if ((buflen -= 8) < 0)
1859                         goto out_resource;
1860                 WRITE32(1);
1861                 WRITE32(bmval0);
1862         }
1863         attrlenp = p++;                /* to be backfilled later */
1864
1865         if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
1866                 u32 word0 = nfsd_suppattrs0(minorversion);
1867                 u32 word1 = nfsd_suppattrs1(minorversion);
1868                 u32 word2 = nfsd_suppattrs2(minorversion);
1869
1870                 if (!aclsupport)
1871                         word0 &= ~FATTR4_WORD0_ACL;
1872                 if (!word2) {
1873                         if ((buflen -= 12) < 0)
1874                                 goto out_resource;
1875                         WRITE32(2);
1876                         WRITE32(word0);
1877                         WRITE32(word1);
1878                 } else {
1879                         if ((buflen -= 16) < 0)
1880                                 goto out_resource;
1881                         WRITE32(3);
1882                         WRITE32(word0);
1883                         WRITE32(word1);
1884                         WRITE32(word2);
1885                 }
1886         }
1887         if (bmval0 & FATTR4_WORD0_TYPE) {
1888                 if ((buflen -= 4) < 0)
1889                         goto out_resource;
1890                 dummy = nfs4_ftypes[(stat.mode & S_IFMT) >> 12];
1891                 if (dummy == NF4BAD)
1892                         goto out_serverfault;
1893                 WRITE32(dummy);
1894         }
1895         if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
1896                 if ((buflen -= 4) < 0)
1897                         goto out_resource;
1898                 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
1899                         WRITE32(NFS4_FH_PERSISTENT);
1900                 else
1901                         WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
1902         }
1903         if (bmval0 & FATTR4_WORD0_CHANGE) {
1904                 if ((buflen -= 8) < 0)
1905                         goto out_resource;
1906                 write_change(&p, &stat, dentry->d_inode);
1907         }
1908         if (bmval0 & FATTR4_WORD0_SIZE) {
1909                 if ((buflen -= 8) < 0)
1910                         goto out_resource;
1911                 WRITE64(stat.size);
1912         }
1913         if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
1914                 if ((buflen -= 4) < 0)
1915                         goto out_resource;
1916                 WRITE32(1);
1917         }
1918         if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
1919                 if ((buflen -= 4) < 0)
1920                         goto out_resource;
1921                 WRITE32(1);
1922         }
1923         if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
1924                 if ((buflen -= 4) < 0)
1925                         goto out_resource;
1926                 WRITE32(0);
1927         }
1928         if (bmval0 & FATTR4_WORD0_FSID) {
1929                 if ((buflen -= 16) < 0)
1930                         goto out_resource;
1931                 if (exp->ex_fslocs.migrated) {
1932                         WRITE64(NFS4_REFERRAL_FSID_MAJOR);
1933                         WRITE64(NFS4_REFERRAL_FSID_MINOR);
1934                 } else switch(fsid_source(fhp)) {
1935                 case FSIDSOURCE_FSID:
1936                         WRITE64((u64)exp->ex_fsid);
1937                         WRITE64((u64)0);
1938                         break;
1939                 case FSIDSOURCE_DEV:
1940                         WRITE32(0);
1941                         WRITE32(MAJOR(stat.dev));
1942                         WRITE32(0);
1943                         WRITE32(MINOR(stat.dev));
1944                         break;
1945                 case FSIDSOURCE_UUID:
1946                         WRITEMEM(exp->ex_uuid, 16);
1947                         break;
1948                 }
1949         }
1950         if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
1951                 if ((buflen -= 4) < 0)
1952                         goto out_resource;
1953                 WRITE32(0);
1954         }
1955         if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
1956                 if ((buflen -= 4) < 0)
1957                         goto out_resource;
1958                 WRITE32(nfsd4_lease);
1959         }
1960         if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
1961                 if ((buflen -= 4) < 0)
1962                         goto out_resource;
1963                 WRITE32(rdattr_err);
1964         }
1965         if (bmval0 & FATTR4_WORD0_ACL) {
1966                 struct nfs4_ace *ace;
1967
1968                 if (acl == NULL) {
1969                         if ((buflen -= 4) < 0)
1970                                 goto out_resource;
1971
1972                         WRITE32(0);
1973                         goto out_acl;
1974                 }
1975                 if ((buflen -= 4) < 0)
1976                         goto out_resource;
1977                 WRITE32(acl->naces);
1978
1979                 for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
1980                         if ((buflen -= 4*3) < 0)
1981                                 goto out_resource;
1982                         WRITE32(ace->type);
1983                         WRITE32(ace->flag);
1984                         WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
1985                         status = nfsd4_encode_aclname(rqstp, ace->whotype,
1986                                 ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
1987                                 &p, &buflen);
1988                         if (status == nfserr_resource)
1989                                 goto out_resource;
1990                         if (status)
1991                                 goto out;
1992                 }
1993         }
1994 out_acl:
1995         if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
1996                 if ((buflen -= 4) < 0)
1997                         goto out_resource;
1998                 WRITE32(aclsupport ?
1999                         ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2000         }
2001         if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2002                 if ((buflen -= 4) < 0)
2003                         goto out_resource;
2004                 WRITE32(1);
2005         }
2006         if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2007                 if ((buflen -= 4) < 0)
2008                         goto out_resource;
2009                 WRITE32(1);
2010         }
2011         if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2012                 if ((buflen -= 4) < 0)
2013                         goto out_resource;
2014                 WRITE32(1);
2015         }
2016         if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2017                 if ((buflen -= 4) < 0)
2018                         goto out_resource;
2019                 WRITE32(1);
2020         }
2021         if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2022                 buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2023                 if (buflen < 0)
2024                         goto out_resource;
2025                 WRITE32(fhp->fh_handle.fh_size);
2026                 WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2027         }
2028         if (bmval0 & FATTR4_WORD0_FILEID) {
2029                 if ((buflen -= 8) < 0)
2030                         goto out_resource;
2031                 WRITE64(stat.ino);
2032         }
2033         if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2034                 if ((buflen -= 8) < 0)
2035                         goto out_resource;
2036                 WRITE64((u64) statfs.f_ffree);
2037         }
2038         if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2039                 if ((buflen -= 8) < 0)
2040                         goto out_resource;
2041                 WRITE64((u64) statfs.f_ffree);
2042         }
2043         if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2044                 if ((buflen -= 8) < 0)
2045                         goto out_resource;
2046                 WRITE64((u64) statfs.f_files);
2047         }
2048         if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2049                 status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2050                 if (status == nfserr_resource)
2051                         goto out_resource;
2052                 if (status)
2053                         goto out;
2054         }
2055         if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2056                 if ((buflen -= 4) < 0)
2057                         goto out_resource;
2058                 WRITE32(1);
2059         }
2060         if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2061                 if ((buflen -= 8) < 0)
2062                         goto out_resource;
2063                 WRITE64(~(u64)0);
2064         }
2065         if (bmval0 & FATTR4_WORD0_MAXLINK) {
2066                 if ((buflen -= 4) < 0)
2067                         goto out_resource;
2068                 WRITE32(255);
2069         }
2070         if (bmval0 & FATTR4_WORD0_MAXNAME) {
2071                 if ((buflen -= 4) < 0)
2072                         goto out_resource;
2073                 WRITE32(statfs.f_namelen);
2074         }
2075         if (bmval0 & FATTR4_WORD0_MAXREAD) {
2076                 if ((buflen -= 8) < 0)
2077                         goto out_resource;
2078                 WRITE64((u64) svc_max_payload(rqstp));
2079         }
2080         if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2081                 if ((buflen -= 8) < 0)
2082                         goto out_resource;
2083                 WRITE64((u64) svc_max_payload(rqstp));
2084         }
2085         if (bmval1 & FATTR4_WORD1_MODE) {
2086                 if ((buflen -= 4) < 0)
2087                         goto out_resource;
2088                 WRITE32(stat.mode & S_IALLUGO);
2089         }
2090         if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2091                 if ((buflen -= 4) < 0)
2092                         goto out_resource;
2093                 WRITE32(1);
2094         }
2095         if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2096                 if ((buflen -= 4) < 0)
2097                         goto out_resource;
2098                 WRITE32(stat.nlink);
2099         }
2100         if (bmval1 & FATTR4_WORD1_OWNER) {
2101                 status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2102                 if (status == nfserr_resource)
2103                         goto out_resource;
2104                 if (status)
2105                         goto out;
2106         }
2107         if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2108                 status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2109                 if (status == nfserr_resource)
2110                         goto out_resource;
2111                 if (status)
2112                         goto out;
2113         }
2114         if (bmval1 & FATTR4_WORD1_RAWDEV) {
2115                 if ((buflen -= 8) < 0)
2116                         goto out_resource;
2117                 WRITE32((u32) MAJOR(stat.rdev));
2118                 WRITE32((u32) MINOR(stat.rdev));
2119         }
2120         if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2121                 if ((buflen -= 8) < 0)
2122                         goto out_resource;
2123                 dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2124                 WRITE64(dummy64);
2125         }
2126         if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2127                 if ((buflen -= 8) < 0)
2128                         goto out_resource;
2129                 dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2130                 WRITE64(dummy64);
2131         }
2132         if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2133                 if ((buflen -= 8) < 0)
2134                         goto out_resource;
2135                 dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2136                 WRITE64(dummy64);
2137         }
2138         if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2139                 if ((buflen -= 8) < 0)
2140                         goto out_resource;
2141                 dummy64 = (u64)stat.blocks << 9;
2142                 WRITE64(dummy64);
2143         }
2144         if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2145                 if ((buflen -= 12) < 0)
2146                         goto out_resource;
2147                 WRITE32(0);
2148                 WRITE32(stat.atime.tv_sec);
2149                 WRITE32(stat.atime.tv_nsec);
2150         }
2151         if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2152                 if ((buflen -= 12) < 0)
2153                         goto out_resource;
2154                 WRITE32(0);
2155                 WRITE32(1);
2156                 WRITE32(0);
2157         }
2158         if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2159                 if ((buflen -= 12) < 0)
2160                         goto out_resource;
2161                 WRITE32(0);
2162                 WRITE32(stat.ctime.tv_sec);
2163                 WRITE32(stat.ctime.tv_nsec);
2164         }
2165         if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2166                 if ((buflen -= 12) < 0)
2167                         goto out_resource;
2168                 WRITE32(0);
2169                 WRITE32(stat.mtime.tv_sec);
2170                 WRITE32(stat.mtime.tv_nsec);
2171         }
2172         if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2173                 if ((buflen -= 8) < 0)
2174                         goto out_resource;
2175                 /*
2176                  * Get parent's attributes if not ignoring crossmount
2177                  * and this is the root of a cross-mounted filesystem.
2178                  */
2179                 if (ignore_crossmnt == 0 &&
2180                     dentry == exp->ex_path.mnt->mnt_root) {
2181                         struct path path = exp->ex_path;
2182                         path_get(&path);
2183                         while (follow_up(&path)) {
2184                                 if (path.dentry != path.mnt->mnt_root)
2185                                         break;
2186                         }
2187                         err = vfs_getattr(path.mnt, path.dentry, &stat);
2188                         path_put(&path);
2189                         if (err)
2190                                 goto out_nfserr;
2191                 }
2192                 WRITE64(stat.ino);
2193         }
2194         if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2195                 WRITE32(3);
2196                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2197                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2198                 WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2199         }
2200
2201         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2202         *countp = p - buffer;
2203         status = nfs_ok;
2204
2205 out:
2206         kfree(acl);
2207         if (fhp == &tempfh)
2208                 fh_put(&tempfh);
2209         return status;
2210 out_nfserr:
2211         status = nfserrno(err);
2212         goto out;
2213 out_resource:
2214         *countp = 0;
2215         status = nfserr_resource;
2216         goto out;
2217 out_serverfault:
2218         status = nfserr_serverfault;
2219         goto out;
2220 }
2221
2222 static inline int attributes_need_mount(u32 *bmval)
2223 {
2224         if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2225                 return 1;
2226         if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2227                 return 1;
2228         return 0;
2229 }
2230
2231 static __be32
2232 nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2233                 const char *name, int namlen, __be32 *p, int *buflen)
2234 {
2235         struct svc_export *exp = cd->rd_fhp->fh_export;
2236         struct dentry *dentry;
2237         __be32 nfserr;
2238         int ignore_crossmnt = 0;
2239
2240         dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2241         if (IS_ERR(dentry))
2242                 return nfserrno(PTR_ERR(dentry));
2243         if (!dentry->d_inode) {
2244                 /*
2245                  * nfsd_buffered_readdir drops the i_mutex between
2246                  * readdir and calling this callback, leaving a window
2247                  * where this directory entry could have gone away.
2248                  */
2249                 dput(dentry);
2250                 return nfserr_noent;
2251         }
2252
2253         exp_get(exp);
2254         /*
2255          * In the case of a mountpoint, the client may be asking for
2256          * attributes that are only properties of the underlying filesystem
2257          * as opposed to the cross-mounted file system. In such a case,
2258          * we will not follow the cross mount and will fill the attribtutes
2259          * directly from the mountpoint dentry.
2260          */
2261         if (nfsd_mountpoint(dentry, exp)) {
2262                 int err;
2263
2264                 if (!(exp->ex_flags & NFSEXP_V4ROOT)
2265                                 && !attributes_need_mount(cd->rd_bmval)) {
2266                         ignore_crossmnt = 1;
2267                         goto out_encode;
2268                 }
2269                 /*
2270                  * Why the heck aren't we just using nfsd_lookup??
2271                  * Different "."/".." handling?  Something else?
2272                  * At least, add a comment here to explain....
2273                  */
2274                 err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2275                 if (err) {
2276                         nfserr = nfserrno(err);
2277                         goto out_put;
2278                 }
2279                 nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2280                 if (nfserr)
2281                         goto out_put;
2282
2283         }
2284 out_encode:
2285         nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2286                                         cd->rd_rqstp, ignore_crossmnt);
2287 out_put:
2288         dput(dentry);
2289         exp_put(exp);
2290         return nfserr;
2291 }
2292
2293 static __be32 *
2294 nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2295 {
2296         __be32 *attrlenp;
2297
2298         if (buflen < 6)
2299                 return NULL;
2300         *p++ = htonl(2);
2301         *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2302         *p++ = htonl(0);                         /* bmval1 */
2303
2304         attrlenp = p++;
2305         *p++ = nfserr;       /* no htonl */
2306         *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2307         return p;
2308 }
2309
2310 static int
2311 nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2312                     loff_t offset, u64 ino, unsigned int d_type)
2313 {
2314         struct readdir_cd *ccd = ccdv;
2315         struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2316         int buflen;
2317         __be32 *p = cd->buffer;
2318         __be32 *cookiep;
2319         __be32 nfserr = nfserr_toosmall;
2320
2321         /* In nfsv4, "." and ".." never make it onto the wire.. */
2322         if (name && isdotent(name, namlen)) {
2323                 cd->common.err = nfs_ok;
2324                 return 0;
2325         }
2326
2327         if (cd->offset)
2328                 xdr_encode_hyper(cd->offset, (u64) offset);
2329
2330         buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2331         if (buflen < 0)
2332                 goto fail;
2333
2334         *p++ = xdr_one;                             /* mark entry present */
2335         cookiep = p;
2336         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2337         p = xdr_encode_array(p, name, namlen);      /* name length & name */
2338
2339         nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2340         switch (nfserr) {
2341         case nfs_ok:
2342                 p += buflen;
2343                 break;
2344         case nfserr_resource:
2345                 nfserr = nfserr_toosmall;
2346                 goto fail;
2347         case nfserr_noent:
2348                 goto skip_entry;
2349         default:
2350                 /*
2351                  * If the client requested the RDATTR_ERROR attribute,
2352                  * we stuff the error code into this attribute
2353                  * and continue.  If this attribute was not requested,
2354                  * then in accordance with the spec, we fail the
2355                  * entire READDIR operation(!)
2356                  */
2357                 if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2358                         goto fail;
2359                 p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2360                 if (p == NULL) {
2361                         nfserr = nfserr_toosmall;
2362                         goto fail;
2363                 }
2364         }
2365         cd->buflen -= (p - cd->buffer);
2366         cd->buffer = p;
2367         cd->offset = cookiep;
2368 skip_entry:
2369         cd->common.err = nfs_ok;
2370         return 0;
2371 fail:
2372         cd->common.err = nfserr;
2373         return -EINVAL;
2374 }
2375
2376 static void
2377 nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2378 {
2379         __be32 *p;
2380
2381         RESERVE_SPACE(sizeof(stateid_t));
2382         WRITE32(sid->si_generation);
2383         WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2384         ADJUST_ARGS();
2385 }
2386
2387 static __be32
2388 nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2389 {
2390         __be32 *p;
2391
2392         if (!nfserr) {
2393                 RESERVE_SPACE(8);
2394                 WRITE32(access->ac_supported);
2395                 WRITE32(access->ac_resp_access);
2396                 ADJUST_ARGS();
2397         }
2398         return nfserr;
2399 }
2400
2401 static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2402 {
2403         __be32 *p;
2404
2405         if (!nfserr) {
2406                 RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2407                 WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2408                 WRITE32(bcts->dir);
2409                 /* XXX: ? */
2410                 WRITE32(0);
2411                 ADJUST_ARGS();
2412         }
2413         return nfserr;
2414 }
2415
2416 static __be32
2417 nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2418 {
2419         ENCODE_SEQID_OP_HEAD;
2420
2421         if (!nfserr)
2422                 nfsd4_encode_stateid(resp, &close->cl_stateid);
2423
2424         ENCODE_SEQID_OP_TAIL(close->cl_stateowner);
2425         return nfserr;
2426 }
2427
2428
2429 static __be32
2430 nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2431 {
2432         __be32 *p;
2433
2434         if (!nfserr) {
2435                 RESERVE_SPACE(8);
2436                 WRITEMEM(commit->co_verf.data, 8);
2437                 ADJUST_ARGS();
2438         }
2439         return nfserr;
2440 }
2441
2442 static __be32
2443 nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2444 {
2445         __be32 *p;
2446
2447         if (!nfserr) {
2448                 RESERVE_SPACE(32);
2449                 write_cinfo(&p, &create->cr_cinfo);
2450                 WRITE32(2);
2451                 WRITE32(create->cr_bmval[0]);
2452                 WRITE32(create->cr_bmval[1]);
2453                 ADJUST_ARGS();
2454         }
2455         return nfserr;
2456 }
2457
2458 static __be32
2459 nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2460 {
2461         struct svc_fh *fhp = getattr->ga_fhp;
2462         int buflen;
2463
2464         if (nfserr)
2465                 return nfserr;
2466
2467         buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2468         nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2469                                     resp->p, &buflen, getattr->ga_bmval,
2470                                     resp->rqstp, 0);
2471         if (!nfserr)
2472                 resp->p += buflen;
2473         return nfserr;
2474 }
2475
2476 static __be32
2477 nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2478 {
2479         struct svc_fh *fhp = *fhpp;
2480         unsigned int len;
2481         __be32 *p;
2482
2483         if (!nfserr) {
2484                 len = fhp->fh_handle.fh_size;
2485                 RESERVE_SPACE(len + 4);
2486                 WRITE32(len);
2487                 WRITEMEM(&fhp->fh_handle.fh_base, len);
2488                 ADJUST_ARGS();
2489         }
2490         return nfserr;
2491 }
2492
2493 /*
2494 * Including all fields other than the name, a LOCK4denied structure requires
2495 *   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2496 */
2497 static void
2498 nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2499 {
2500         __be32 *p;
2501
2502         RESERVE_SPACE(32 + XDR_LEN(ld->ld_sop ? ld->ld_sop->so_owner.len : 0));
2503         WRITE64(ld->ld_start);
2504         WRITE64(ld->ld_length);
2505         WRITE32(ld->ld_type);
2506         if (ld->ld_sop) {
2507                 WRITEMEM(&ld->ld_clientid, 8);
2508                 WRITE32(ld->ld_sop->so_owner.len);
2509                 WRITEMEM(ld->ld_sop->so_owner.data, ld->ld_sop->so_owner.len);
2510                 kref_put(&ld->ld_sop->so_ref, nfs4_free_stateowner);
2511         }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2512                 WRITE64((u64)0); /* clientid */
2513                 WRITE32(0); /* length of owner name */
2514         }
2515         ADJUST_ARGS();
2516 }
2517
2518 static __be32
2519 nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2520 {
2521         ENCODE_SEQID_OP_HEAD;
2522
2523         if (!nfserr)
2524                 nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2525         else if (nfserr == nfserr_denied)
2526                 nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2527
2528         ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
2529         return nfserr;
2530 }
2531
2532 static __be32
2533 nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2534 {
2535         if (nfserr == nfserr_denied)
2536                 nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2537         return nfserr;
2538 }
2539
2540 static __be32
2541 nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2542 {
2543         ENCODE_SEQID_OP_HEAD;
2544
2545         if (!nfserr)
2546                 nfsd4_encode_stateid(resp, &locku->lu_stateid);
2547
2548         ENCODE_SEQID_OP_TAIL(locku->lu_stateowner);
2549         return nfserr;
2550 }
2551
2552
2553 static __be32
2554 nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2555 {
2556         __be32 *p;
2557
2558         if (!nfserr) {
2559                 RESERVE_SPACE(20);
2560                 write_cinfo(&p, &link->li_cinfo);
2561                 ADJUST_ARGS();
2562         }
2563         return nfserr;
2564 }
2565
2566
2567 static __be32
2568 nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2569 {
2570         __be32 *p;
2571         ENCODE_SEQID_OP_HEAD;
2572
2573         if (nfserr)
2574                 goto out;
2575
2576         nfsd4_encode_stateid(resp, &open->op_stateid);
2577         RESERVE_SPACE(40);
2578         write_cinfo(&p, &open->op_cinfo);
2579         WRITE32(open->op_rflags);
2580         WRITE32(2);
2581         WRITE32(open->op_bmval[0]);
2582         WRITE32(open->op_bmval[1]);
2583         WRITE32(open->op_delegate_type);
2584         ADJUST_ARGS();
2585
2586         switch (open->op_delegate_type) {
2587         case NFS4_OPEN_DELEGATE_NONE:
2588                 break;
2589         case NFS4_OPEN_DELEGATE_READ:
2590                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2591                 RESERVE_SPACE(20);
2592                 WRITE32(open->op_recall);
2593
2594                 /*
2595                  * TODO: ACE's in delegations
2596                  */
2597                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2598                 WRITE32(0);
2599                 WRITE32(0);
2600                 WRITE32(0);   /* XXX: is NULL principal ok? */
2601                 ADJUST_ARGS();
2602                 break;
2603         case NFS4_OPEN_DELEGATE_WRITE:
2604                 nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2605                 RESERVE_SPACE(32);
2606                 WRITE32(0);
2607
2608                 /*
2609                  * TODO: space_limit's in delegations
2610                  */
2611                 WRITE32(NFS4_LIMIT_SIZE);
2612                 WRITE32(~(u32)0);
2613                 WRITE32(~(u32)0);
2614
2615                 /*
2616                  * TODO: ACE's in delegations
2617                  */
2618                 WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2619                 WRITE32(0);
2620                 WRITE32(0);
2621                 WRITE32(0);   /* XXX: is NULL principal ok? */
2622                 ADJUST_ARGS();
2623                 break;
2624         default:
2625                 BUG();
2626         }
2627         /* XXX save filehandle here */
2628 out:
2629         ENCODE_SEQID_OP_TAIL(open->op_stateowner);
2630         return nfserr;
2631 }
2632
2633 static __be32
2634 nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2635 {
2636         ENCODE_SEQID_OP_HEAD;
2637
2638         if (!nfserr)
2639                 nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2640
2641         ENCODE_SEQID_OP_TAIL(oc->oc_stateowner);
2642         return nfserr;
2643 }
2644
2645 static __be32
2646 nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2647 {
2648         ENCODE_SEQID_OP_HEAD;
2649
2650         if (!nfserr)
2651                 nfsd4_encode_stateid(resp, &od->od_stateid);
2652
2653         ENCODE_SEQID_OP_TAIL(od->od_stateowner);
2654         return nfserr;
2655 }
2656
2657 static __be32
2658 nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2659                   struct nfsd4_read *read)
2660 {
2661         u32 eof;
2662         int v, pn;
2663         unsigned long maxcount;
2664         long len;
2665         __be32 *p;
2666
2667         if (nfserr)
2668                 return nfserr;
2669         if (resp->xbuf->page_len)
2670                 return nfserr_resource;
2671
2672         RESERVE_SPACE(8); /* eof flag and byte count */
2673
2674         maxcount = svc_max_payload(resp->rqstp);
2675         if (maxcount > read->rd_length)
2676                 maxcount = read->rd_length;
2677
2678         len = maxcount;
2679         v = 0;
2680         while (len > 0) {
2681                 pn = resp->rqstp->rq_resused++;
2682                 resp->rqstp->rq_vec[v].iov_base =
2683                         page_address(resp->rqstp->rq_respages[pn]);
2684                 resp->rqstp->rq_vec[v].iov_len =
2685                         len < PAGE_SIZE ? len : PAGE_SIZE;
2686                 v++;
2687                 len -= PAGE_SIZE;
2688         }
2689         read->rd_vlen = v;
2690
2691         nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2692                         read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2693                         &maxcount);
2694
2695         if (nfserr == nfserr_symlink)
2696                 nfserr = nfserr_inval;
2697         if (nfserr)
2698                 return nfserr;
2699         eof = (read->rd_offset + maxcount >=
2700                read->rd_fhp->fh_dentry->d_inode->i_size);
2701
2702         WRITE32(eof);
2703         WRITE32(maxcount);
2704         ADJUST_ARGS();
2705         resp->xbuf->head[0].iov_len = (char*)p
2706                                         - (char*)resp->xbuf->head[0].iov_base;
2707         resp->xbuf->page_len = maxcount;
2708
2709         /* Use rest of head for padding and remaining ops: */
2710         resp->xbuf->tail[0].iov_base = p;
2711         resp->xbuf->tail[0].iov_len = 0;
2712         if (maxcount&3) {
2713                 RESERVE_SPACE(4);
2714                 WRITE32(0);
2715                 resp->xbuf->tail[0].iov_base += maxcount&3;
2716                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2717                 ADJUST_ARGS();
2718         }
2719         return 0;
2720 }
2721
2722 static __be32
2723 nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2724 {
2725         int maxcount;
2726         char *page;
2727         __be32 *p;
2728
2729         if (nfserr)
2730                 return nfserr;
2731         if (resp->xbuf->page_len)
2732                 return nfserr_resource;
2733
2734         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2735
2736         maxcount = PAGE_SIZE;
2737         RESERVE_SPACE(4);
2738
2739         /*
2740          * XXX: By default, the ->readlink() VFS op will truncate symlinks
2741          * if they would overflow the buffer.  Is this kosher in NFSv4?  If
2742          * not, one easy fix is: if ->readlink() precisely fills the buffer,
2743          * assume that truncation occurred, and return NFS4ERR_RESOURCE.
2744          */
2745         nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
2746         if (nfserr == nfserr_isdir)
2747                 return nfserr_inval;
2748         if (nfserr)
2749                 return nfserr;
2750
2751         WRITE32(maxcount);
2752         ADJUST_ARGS();
2753         resp->xbuf->head[0].iov_len = (char*)p
2754                                 - (char*)resp->xbuf->head[0].iov_base;
2755         resp->xbuf->page_len = maxcount;
2756
2757         /* Use rest of head for padding and remaining ops: */
2758         resp->xbuf->tail[0].iov_base = p;
2759         resp->xbuf->tail[0].iov_len = 0;
2760         if (maxcount&3) {
2761                 RESERVE_SPACE(4);
2762                 WRITE32(0);
2763                 resp->xbuf->tail[0].iov_base += maxcount&3;
2764                 resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2765                 ADJUST_ARGS();
2766         }
2767         return 0;
2768 }
2769
2770 static __be32
2771 nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
2772 {
2773         int maxcount;
2774         loff_t offset;
2775         __be32 *page, *savep, *tailbase;
2776         __be32 *p;
2777
2778         if (nfserr)
2779                 return nfserr;
2780         if (resp->xbuf->page_len)
2781                 return nfserr_resource;
2782
2783         RESERVE_SPACE(8);  /* verifier */
2784         savep = p;
2785
2786         /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
2787         WRITE32(0);
2788         WRITE32(0);
2789         ADJUST_ARGS();
2790         resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
2791         tailbase = p;
2792
2793         maxcount = PAGE_SIZE;
2794         if (maxcount > readdir->rd_maxcount)
2795                 maxcount = readdir->rd_maxcount;
2796
2797         /*
2798          * Convert from bytes to words, account for the two words already
2799          * written, make sure to leave two words at the end for the next
2800          * pointer and eof field.
2801          */
2802         maxcount = (maxcount >> 2) - 4;
2803         if (maxcount < 0) {
2804                 nfserr =  nfserr_toosmall;
2805                 goto err_no_verf;
2806         }
2807
2808         page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
2809         readdir->common.err = 0;
2810         readdir->buflen = maxcount;
2811         readdir->buffer = page;
2812         readdir->offset = NULL;
2813
2814         offset = readdir->rd_cookie;
2815         nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
2816                               &offset,
2817                               &readdir->common, nfsd4_encode_dirent);
2818         if (nfserr == nfs_ok &&
2819             readdir->common.err == nfserr_toosmall &&
2820             readdir->buffer == page)
2821                 nfserr = nfserr_toosmall;
2822         if (nfserr == nfserr_symlink)
2823                 nfserr = nfserr_notdir;
2824         if (nfserr)
2825                 goto err_no_verf;
2826
2827         if (readdir->offset)
2828                 xdr_encode_hyper(readdir->offset, offset);
2829
2830         p = readdir->buffer;
2831         *p++ = 0;       /* no more entries */
2832         *p++ = htonl(readdir->common.err == nfserr_eof);
2833         resp->xbuf->page_len = ((char*)p) - (char*)page_address(
2834                 resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
2835
2836         /* Use rest of head for padding and remaining ops: */
2837         resp->xbuf->tail[0].iov_base = tailbase;
2838         resp->xbuf->tail[0].iov_len = 0;
2839         resp->p = resp->xbuf->tail[0].iov_base;
2840         resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
2841
2842         return 0;
2843 err_no_verf:
2844         p = savep;
2845         ADJUST_ARGS();
2846         return nfserr;
2847 }
2848
2849 static __be32
2850 nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
2851 {
2852         __be32 *p;
2853
2854         if (!nfserr) {
2855                 RESERVE_SPACE(20);
2856                 write_cinfo(&p, &remove->rm_cinfo);
2857                 ADJUST_ARGS();
2858         }
2859         return nfserr;
2860 }
2861
2862 static __be32
2863 nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
2864 {
2865         __be32 *p;
2866
2867         if (!nfserr) {
2868                 RESERVE_SPACE(40);
2869                 write_cinfo(&p, &rename->rn_sinfo);
2870                 write_cinfo(&p, &rename->rn_tinfo);
2871                 ADJUST_ARGS();
2872         }
2873         return nfserr;
2874 }
2875
2876 static __be32
2877 nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
2878                          __be32 nfserr,struct svc_export *exp)
2879 {
2880         int i = 0;
2881         u32 nflavs;
2882         struct exp_flavor_info *flavs;
2883         struct exp_flavor_info def_flavs[2];
2884         __be32 *p;
2885
2886         if (nfserr)
2887                 goto out;
2888         if (exp->ex_nflavors) {
2889                 flavs = exp->ex_flavors;
2890                 nflavs = exp->ex_nflavors;
2891         } else { /* Handling of some defaults in absence of real secinfo: */
2892                 flavs = def_flavs;
2893                 if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
2894                         nflavs = 2;
2895                         flavs[0].pseudoflavor = RPC_AUTH_UNIX;
2896                         flavs[1].pseudoflavor = RPC_AUTH_NULL;
2897                 } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
2898                         nflavs = 1;
2899                         flavs[0].pseudoflavor
2900                                         = svcauth_gss_flavor(exp->ex_client);
2901                 } else {
2902                         nflavs = 1;
2903                         flavs[0].pseudoflavor
2904                                         = exp->ex_client->flavour->flavour;
2905                 }
2906         }
2907
2908         RESERVE_SPACE(4);
2909         WRITE32(nflavs);
2910         ADJUST_ARGS();
2911         for (i = 0; i < nflavs; i++) {
2912                 u32 flav = flavs[i].pseudoflavor;
2913                 struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
2914
2915                 if (gm) {
2916                         RESERVE_SPACE(4);
2917                         WRITE32(RPC_AUTH_GSS);
2918                         ADJUST_ARGS();
2919                         RESERVE_SPACE(4 + gm->gm_oid.len);
2920                         WRITE32(gm->gm_oid.len);
2921                         WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
2922                         ADJUST_ARGS();
2923                         RESERVE_SPACE(4);
2924                         WRITE32(0); /* qop */
2925                         ADJUST_ARGS();
2926                         RESERVE_SPACE(4);
2927                         WRITE32(gss_pseudoflavor_to_service(gm, flav));
2928                         ADJUST_ARGS();
2929                         gss_mech_put(gm);
2930                 } else {
2931                         RESERVE_SPACE(4);
2932                         WRITE32(flav);
2933                         ADJUST_ARGS();
2934                 }
2935         }
2936 out:
2937         if (exp)
2938                 exp_put(exp);
2939         return nfserr;
2940 }
2941
2942 static __be32
2943 nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
2944                      struct nfsd4_secinfo *secinfo)
2945 {
2946         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
2947 }
2948
2949 static __be32
2950 nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
2951                      struct nfsd4_secinfo_no_name *secinfo)
2952 {
2953         return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
2954 }
2955
2956 /*
2957  * The SETATTR encode routine is special -- it always encodes a bitmap,
2958  * regardless of the error status.
2959  */
2960 static __be32
2961 nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
2962 {
2963         __be32 *p;
2964
2965         RESERVE_SPACE(12);
2966         if (nfserr) {
2967                 WRITE32(2);
2968                 WRITE32(0);
2969                 WRITE32(0);
2970         }
2971         else {
2972                 WRITE32(2);
2973                 WRITE32(setattr->sa_bmval[0]);
2974                 WRITE32(setattr->sa_bmval[1]);
2975         }
2976         ADJUST_ARGS();
2977         return nfserr;
2978 }
2979
2980 static __be32
2981 nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
2982 {
2983         __be32 *p;
2984
2985         if (!nfserr) {
2986                 RESERVE_SPACE(8 + sizeof(nfs4_verifier));
2987                 WRITEMEM(&scd->se_clientid, 8);
2988                 WRITEMEM(&scd->se_confirm, sizeof(nfs4_verifier));
2989                 ADJUST_ARGS();
2990         }
2991         else if (nfserr == nfserr_clid_inuse) {
2992                 RESERVE_SPACE(8);
2993                 WRITE32(0);
2994                 WRITE32(0);
2995                 ADJUST_ARGS();
2996         }
2997         return nfserr;
2998 }
2999
3000 static __be32
3001 nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3002 {
3003         __be32 *p;
3004
3005         if (!nfserr) {
3006                 RESERVE_SPACE(16);
3007                 WRITE32(write->wr_bytes_written);
3008                 WRITE32(write->wr_how_written);
3009                 WRITEMEM(write->wr_verifier.data, 8);
3010                 ADJUST_ARGS();
3011         }
3012         return nfserr;
3013 }
3014
3015 static __be32
3016 nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, int nfserr,
3017                          struct nfsd4_exchange_id *exid)
3018 {
3019         __be32 *p;
3020         char *major_id;
3021         char *server_scope;
3022         int major_id_sz;
3023         int server_scope_sz;
3024         uint64_t minor_id = 0;
3025
3026         if (nfserr)
3027                 return nfserr;
3028
3029         major_id = utsname()->nodename;
3030         major_id_sz = strlen(major_id);
3031         server_scope = utsname()->nodename;
3032         server_scope_sz = strlen(server_scope);
3033
3034         RESERVE_SPACE(
3035                 8 /* eir_clientid */ +
3036                 4 /* eir_sequenceid */ +
3037                 4 /* eir_flags */ +
3038                 4 /* spr_how (SP4_NONE) */ +
3039                 8 /* so_minor_id */ +
3040                 4 /* so_major_id.len */ +
3041                 (XDR_QUADLEN(major_id_sz) * 4) +
3042                 4 /* eir_server_scope.len */ +
3043                 (XDR_QUADLEN(server_scope_sz) * 4) +
3044                 4 /* eir_server_impl_id.count (0) */);
3045
3046         WRITEMEM(&exid->clientid, 8);
3047         WRITE32(exid->seqid);
3048         WRITE32(exid->flags);
3049
3050         /* state_protect4_r. Currently only support SP4_NONE */
3051         BUG_ON(exid->spa_how != SP4_NONE);
3052         WRITE32(exid->spa_how);
3053
3054         /* The server_owner struct */
3055         WRITE64(minor_id);      /* Minor id */
3056         /* major id */
3057         WRITE32(major_id_sz);
3058         WRITEMEM(major_id, major_id_sz);
3059
3060         /* Server scope */
3061         WRITE32(server_scope_sz);
3062         WRITEMEM(server_scope, server_scope_sz);
3063
3064         /* Implementation id */
3065         WRITE32(0);     /* zero length nfs_impl_id4 array */
3066         ADJUST_ARGS();
3067         return 0;
3068 }
3069
3070 static __be32
3071 nfsd4_encode_create_session(struct nfsd4_compoundres *resp, int nfserr,
3072                             struct nfsd4_create_session *sess)
3073 {
3074         __be32 *p;
3075
3076         if (nfserr)
3077                 return nfserr;
3078
3079         RESERVE_SPACE(24);
3080         WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3081         WRITE32(sess->seqid);
3082         WRITE32(sess->flags);
3083         ADJUST_ARGS();
3084
3085         RESERVE_SPACE(28);
3086         WRITE32(0); /* headerpadsz */
3087         WRITE32(sess->fore_channel.maxreq_sz);
3088         WRITE32(sess->fore_channel.maxresp_sz);
3089         WRITE32(sess->fore_channel.maxresp_cached);
3090         WRITE32(sess->fore_channel.maxops);
3091         WRITE32(sess->fore_channel.maxreqs);
3092         WRITE32(sess->fore_channel.nr_rdma_attrs);
3093         ADJUST_ARGS();
3094
3095         if (sess->fore_channel.nr_rdma_attrs) {
3096                 RESERVE_SPACE(4);
3097                 WRITE32(sess->fore_channel.rdma_attrs);
3098                 ADJUST_ARGS();
3099         }
3100
3101         RESERVE_SPACE(28);
3102         WRITE32(0); /* headerpadsz */
3103         WRITE32(sess->back_channel.maxreq_sz);
3104         WRITE32(sess->back_channel.maxresp_sz);
3105         WRITE32(sess->back_channel.maxresp_cached);
3106         WRITE32(sess->back_channel.maxops);
3107         WRITE32(sess->back_channel.maxreqs);
3108         WRITE32(sess->back_channel.nr_rdma_attrs);
3109         ADJUST_ARGS();
3110
3111         if (sess->back_channel.nr_rdma_attrs) {
3112                 RESERVE_SPACE(4);
3113                 WRITE32(sess->back_channel.rdma_attrs);
3114                 ADJUST_ARGS();
3115         }
3116         return 0;
3117 }
3118
3119 static __be32
3120 nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
3121                              struct nfsd4_destroy_session *destroy_session)
3122 {
3123         return nfserr;
3124 }
3125
3126 __be32
3127 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
3128                       struct nfsd4_sequence *seq)
3129 {
3130         __be32 *p;
3131
3132         if (nfserr)
3133                 return nfserr;
3134
3135         RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3136         WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3137         WRITE32(seq->seqid);
3138         WRITE32(seq->slotid);
3139         WRITE32(seq->maxslots);
3140         /* For now: target_maxslots = maxslots */
3141         WRITE32(seq->maxslots);
3142         WRITE32(seq->status_flags);
3143
3144         ADJUST_ARGS();
3145         resp->cstate.datap = p; /* DRC cache data pointer */
3146         return 0;
3147 }
3148
3149 static __be32
3150 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3151 {
3152         return nfserr;
3153 }
3154
3155 typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3156
3157 /*
3158  * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3159  * since we don't need to filter out obsolete ops as this is
3160  * done in the decoding phase.
3161  */
3162 static nfsd4_enc nfsd4_enc_ops[] = {
3163         [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3164         [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3165         [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3166         [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3167         [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3168         [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3169         [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3170         [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3171         [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3172         [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3173         [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3174         [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3175         [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3176         [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3177         [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3178         [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3179         [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3180         [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3181         [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3182         [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3183         [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3184         [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3185         [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3186         [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3187         [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3188         [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3189         [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3190         [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3191         [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3192         [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3193         [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3194         [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3195         [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3196         [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3197         [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3198         [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3199         [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3200
3201         /* NFSv4.1 operations */
3202         [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3203         [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3204         [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3205         [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3206         [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3207         [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3208         [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3209         [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3210         [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3211         [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3212         [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3213         [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3214         [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3215         [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3216         [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3217         [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_noop,
3218         [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3219         [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3220         [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3221 };
3222
3223 /*
3224  * Calculate the total amount of memory that the compound response has taken
3225  * after encoding the current operation.
3226  *
3227  * pad: add on 8 bytes for the next operation's op_code and status so that
3228  * there is room to cache a failure on the next operation.
3229  *
3230  * Compare this length to the session se_fmaxresp_cached.
3231  *
3232  * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3233  * will be at least a page and will therefore hold the xdr_buf head.
3234  */
3235 static int nfsd4_check_drc_limit(struct nfsd4_compoundres *resp)
3236 {
3237         int status = 0;
3238         struct xdr_buf *xb = &resp->rqstp->rq_res;
3239         struct nfsd4_compoundargs *args = resp->rqstp->rq_argp;
3240         struct nfsd4_session *session = NULL;
3241         struct nfsd4_slot *slot = resp->cstate.slot;
3242         u32 length, tlen = 0, pad = 8;
3243
3244         if (!nfsd4_has_session(&resp->cstate))
3245                 return status;
3246
3247         session = resp->cstate.session;
3248         if (session == NULL || slot->sl_cachethis == 0)
3249                 return status;
3250
3251         if (resp->opcnt >= args->opcnt)
3252                 pad = 0; /* this is the last operation */
3253
3254         if (xb->page_len == 0) {
3255                 length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3256         } else {
3257                 if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3258                         tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3259
3260                 length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3261         }
3262         dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3263                 length, xb->page_len, tlen, pad);
3264
3265         if (length <= session->se_fchannel.maxresp_cached)
3266                 return status;
3267         else
3268                 return nfserr_rep_too_big_to_cache;
3269 }
3270
3271 void
3272 nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3273 {
3274         __be32 *statp;
3275         __be32 *p;
3276
3277         RESERVE_SPACE(8);
3278         WRITE32(op->opnum);
3279         statp = p++;    /* to be backfilled at the end */
3280         ADJUST_ARGS();
3281
3282         if (op->opnum == OP_ILLEGAL)
3283                 goto status;
3284         BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3285                !nfsd4_enc_ops[op->opnum]);
3286         op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3287         /* nfsd4_check_drc_limit guarantees enough room for error status */
3288         if (!op->status && nfsd4_check_drc_limit(resp))
3289                 op->status = nfserr_rep_too_big_to_cache;
3290 status:
3291         /*
3292          * Note: We write the status directly, instead of using WRITE32(),
3293          * since it is already in network byte order.
3294          */
3295         *statp = op->status;
3296 }
3297
3298 /*
3299  * Encode the reply stored in the stateowner reply cache
3300  *
3301  * XDR note: do not encode rp->rp_buflen: the buffer contains the
3302  * previously sent already encoded operation.
3303  *
3304  * called with nfs4_lock_state() held
3305  */
3306 void
3307 nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3308 {
3309         __be32 *p;
3310         struct nfs4_replay *rp = op->replay;
3311
3312         BUG_ON(!rp);
3313
3314         RESERVE_SPACE(8);
3315         WRITE32(op->opnum);
3316         *p++ = rp->rp_status;  /* already xdr'ed */
3317         ADJUST_ARGS();
3318
3319         RESERVE_SPACE(rp->rp_buflen);
3320         WRITEMEM(rp->rp_buf, rp->rp_buflen);
3321         ADJUST_ARGS();
3322 }
3323
3324 int
3325 nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3326 {
3327         return xdr_ressize_check(rqstp, p);
3328 }
3329
3330 void nfsd4_release_compoundargs(struct nfsd4_compoundargs *args)
3331 {
3332         if (args->ops != args->iops) {
3333                 kfree(args->ops);
3334                 args->ops = args->iops;
3335         }
3336         kfree(args->tmpp);
3337         args->tmpp = NULL;
3338         while (args->to_free) {
3339                 struct tmpbuf *tb = args->to_free;
3340                 args->to_free = tb->next;
3341                 tb->release(tb->buf);
3342                 kfree(tb);
3343         }
3344 }
3345
3346 int
3347 nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3348 {
3349         __be32 status;
3350
3351         args->p = p;
3352         args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3353         args->pagelist = rqstp->rq_arg.pages;
3354         args->pagelen = rqstp->rq_arg.page_len;
3355         args->tmpp = NULL;
3356         args->to_free = NULL;
3357         args->ops = args->iops;
3358         args->rqstp = rqstp;
3359
3360         status = nfsd4_decode_compound(args);
3361         if (status) {
3362                 nfsd4_release_compoundargs(args);
3363         }
3364         return !status;
3365 }
3366
3367 int
3368 nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3369 {
3370         /*
3371          * All that remains is to write the tag and operation count...
3372          */
3373         struct nfsd4_compound_state *cs = &resp->cstate;
3374         struct kvec *iov;
3375         p = resp->tagp;
3376         *p++ = htonl(resp->taglen);
3377         memcpy(p, resp->tag, resp->taglen);
3378         p += XDR_QUADLEN(resp->taglen);
3379         *p++ = htonl(resp->opcnt);
3380
3381         if (rqstp->rq_res.page_len)
3382                 iov = &rqstp->rq_res.tail[0];
3383         else
3384                 iov = &rqstp->rq_res.head[0];
3385         iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3386         BUG_ON(iov->iov_len > PAGE_SIZE);
3387         if (nfsd4_has_session(cs)) {
3388                 if (cs->status != nfserr_replay_cache) {
3389                         nfsd4_store_cache_entry(resp);
3390                         dprintk("%s: SET SLOT STATE TO AVAILABLE\n", __func__);
3391                         cs->slot->sl_inuse = false;
3392                 }
3393                 /* Renew the clientid on success and on replay */
3394                 release_session_client(cs->session);
3395                 nfsd4_put_session(cs->session);
3396         }
3397         return 1;
3398 }
3399
3400 /*
3401  * Local variables:
3402  *  c-basic-offset: 8
3403  * End:
3404  */