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