linux/fs/nfsd/nfs4xdr.c
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   1/*
   2 *  Server-side XDR for NFSv4
   3 *
   4 *  Copyright (c) 2002 The Regents of the University of Michigan.
   5 *  All rights reserved.
   6 *
   7 *  Kendrick Smith <kmsmith@umich.edu>
   8 *  Andy Adamson   <andros@umich.edu>
   9 *
  10 *  Redistribution and use in source and binary forms, with or without
  11 *  modification, are permitted provided that the following conditions
  12 *  are met:
  13 *
  14 *  1. Redistributions of source code must retain the above copyright
  15 *     notice, this list of conditions and the following disclaimer.
  16 *  2. Redistributions in binary form must reproduce the above copyright
  17 *     notice, this list of conditions and the following disclaimer in the
  18 *     documentation and/or other materials provided with the distribution.
  19 *  3. Neither the name of the University nor the names of its
  20 *     contributors may be used to endorse or promote products derived
  21 *     from this software without specific prior written permission.
  22 *
  23 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  24 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  25 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  26 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  30 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  31 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  32 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  33 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34 *
  35 * TODO: Neil Brown made the following observation:  We currently
  36 * initially reserve NFSD_BUFSIZE space on the transmit queue and
  37 * never release any of that until the request is complete.
  38 * It would be good to calculate a new maximum response size while
  39 * decoding the COMPOUND, and call svc_reserve with this number
  40 * at the end of nfs4svc_decode_compoundargs.
  41 */
  42
  43#include <linux/slab.h>
  44#include <linux/namei.h>
  45#include <linux/statfs.h>
  46#include <linux/utsname.h>
  47#include <linux/pagemap.h>
  48#include <linux/sunrpc/svcauth_gss.h>
  49
  50#include "idmap.h"
  51#include "acl.h"
  52#include "xdr4.h"
  53#include "vfs.h"
  54#include "state.h"
  55#include "cache.h"
  56
  57#define NFSDDBG_FACILITY                NFSDDBG_XDR
  58
  59/*
  60 * As per referral draft, the fsid for a referral MUST be different from the fsid of the containing
  61 * directory in order to indicate to the client that a filesystem boundary is present
  62 * We use a fixed fsid for a referral
  63 */
  64#define NFS4_REFERRAL_FSID_MAJOR        0x8000000ULL
  65#define NFS4_REFERRAL_FSID_MINOR        0x8000000ULL
  66
  67static __be32
  68check_filename(char *str, int len, __be32 err)
  69{
  70        int i;
  71
  72        if (len == 0)
  73                return nfserr_inval;
  74        if (isdotent(str, len))
  75                return err;
  76        for (i = 0; i < len; i++)
  77                if (str[i] == '/')
  78                        return err;
  79        return 0;
  80}
  81
  82#define DECODE_HEAD                             \
  83        __be32 *p;                              \
  84        __be32 status
  85#define DECODE_TAIL                             \
  86        status = 0;                             \
  87out:                                            \
  88        return status;                          \
  89xdr_error:                                      \
  90        dprintk("NFSD: xdr error (%s:%d)\n",    \
  91                        __FILE__, __LINE__);    \
  92        status = nfserr_bad_xdr;                \
  93        goto out
  94
  95#define READ32(x)         (x) = ntohl(*p++)
  96#define READ64(x)         do {                  \
  97        (x) = (u64)ntohl(*p++) << 32;           \
  98        (x) |= ntohl(*p++);                     \
  99} while (0)
 100#define READTIME(x)       do {                  \
 101        p++;                                    \
 102        (x) = ntohl(*p++);                      \
 103        p++;                                    \
 104} while (0)
 105#define READMEM(x,nbytes) do {                  \
 106        x = (char *)p;                          \
 107        p += XDR_QUADLEN(nbytes);               \
 108} while (0)
 109#define SAVEMEM(x,nbytes) do {                  \
 110        if (!(x = (p==argp->tmp || p == argp->tmpp) ? \
 111                savemem(argp, p, nbytes) :      \
 112                (char *)p)) {                   \
 113                dprintk("NFSD: xdr error (%s:%d)\n", \
 114                                __FILE__, __LINE__); \
 115                goto xdr_error;                 \
 116                }                               \
 117        p += XDR_QUADLEN(nbytes);               \
 118} while (0)
 119#define COPYMEM(x,nbytes) do {                  \
 120        memcpy((x), p, nbytes);                 \
 121        p += XDR_QUADLEN(nbytes);               \
 122} while (0)
 123
 124/* READ_BUF, read_buf(): nbytes must be <= PAGE_SIZE */
 125#define READ_BUF(nbytes)  do {                  \
 126        if (nbytes <= (u32)((char *)argp->end - (char *)argp->p)) {     \
 127                p = argp->p;                    \
 128                argp->p += XDR_QUADLEN(nbytes); \
 129        } else if (!(p = read_buf(argp, nbytes))) { \
 130                dprintk("NFSD: xdr error (%s:%d)\n", \
 131                                __FILE__, __LINE__); \
 132                goto xdr_error;                 \
 133        }                                       \
 134} while (0)
 135
 136static __be32 *read_buf(struct nfsd4_compoundargs *argp, u32 nbytes)
 137{
 138        /* We want more bytes than seem to be available.
 139         * Maybe we need a new page, maybe we have just run out
 140         */
 141        unsigned int avail = (char *)argp->end - (char *)argp->p;
 142        __be32 *p;
 143        if (avail + argp->pagelen < nbytes)
 144                return NULL;
 145        if (avail + PAGE_SIZE < nbytes) /* need more than a page !! */
 146                return NULL;
 147        /* ok, we can do it with the current plus the next page */
 148        if (nbytes <= sizeof(argp->tmp))
 149                p = argp->tmp;
 150        else {
 151                kfree(argp->tmpp);
 152                p = argp->tmpp = kmalloc(nbytes, GFP_KERNEL);
 153                if (!p)
 154                        return NULL;
 155                
 156        }
 157        /*
 158         * The following memcpy is safe because read_buf is always
 159         * called with nbytes > avail, and the two cases above both
 160         * guarantee p points to at least nbytes bytes.
 161         */
 162        memcpy(p, argp->p, avail);
 163        /* step to next page */
 164        argp->p = page_address(argp->pagelist[0]);
 165        argp->pagelist++;
 166        if (argp->pagelen < PAGE_SIZE) {
 167                argp->end = argp->p + (argp->pagelen>>2);
 168                argp->pagelen = 0;
 169        } else {
 170                argp->end = argp->p + (PAGE_SIZE>>2);
 171                argp->pagelen -= PAGE_SIZE;
 172        }
 173        memcpy(((char*)p)+avail, argp->p, (nbytes - avail));
 174        argp->p += XDR_QUADLEN(nbytes - avail);
 175        return p;
 176}
 177
 178static int zero_clientid(clientid_t *clid)
 179{
 180        return (clid->cl_boot == 0) && (clid->cl_id == 0);
 181}
 182
 183static int
 184defer_free(struct nfsd4_compoundargs *argp,
 185                void (*release)(const void *), void *p)
 186{
 187        struct tmpbuf *tb;
 188
 189        tb = kmalloc(sizeof(*tb), GFP_KERNEL);
 190        if (!tb)
 191                return -ENOMEM;
 192        tb->buf = p;
 193        tb->release = release;
 194        tb->next = argp->to_free;
 195        argp->to_free = tb;
 196        return 0;
 197}
 198
 199static char *savemem(struct nfsd4_compoundargs *argp, __be32 *p, int nbytes)
 200{
 201        if (p == argp->tmp) {
 202                p = kmemdup(argp->tmp, nbytes, GFP_KERNEL);
 203                if (!p)
 204                        return NULL;
 205        } else {
 206                BUG_ON(p != argp->tmpp);
 207                argp->tmpp = NULL;
 208        }
 209        if (defer_free(argp, kfree, p)) {
 210                kfree(p);
 211                return NULL;
 212        } else
 213                return (char *)p;
 214}
 215
 216static __be32
 217nfsd4_decode_bitmap(struct nfsd4_compoundargs *argp, u32 *bmval)
 218{
 219        u32 bmlen;
 220        DECODE_HEAD;
 221
 222        bmval[0] = 0;
 223        bmval[1] = 0;
 224        bmval[2] = 0;
 225
 226        READ_BUF(4);
 227        READ32(bmlen);
 228        if (bmlen > 1000)
 229                goto xdr_error;
 230
 231        READ_BUF(bmlen << 2);
 232        if (bmlen > 0)
 233                READ32(bmval[0]);
 234        if (bmlen > 1)
 235                READ32(bmval[1]);
 236        if (bmlen > 2)
 237                READ32(bmval[2]);
 238
 239        DECODE_TAIL;
 240}
 241
 242static __be32
 243nfsd4_decode_fattr(struct nfsd4_compoundargs *argp, u32 *bmval,
 244                   struct iattr *iattr, struct nfs4_acl **acl)
 245{
 246        int expected_len, len = 0;
 247        u32 dummy32;
 248        char *buf;
 249        int host_err;
 250
 251        DECODE_HEAD;
 252        iattr->ia_valid = 0;
 253        if ((status = nfsd4_decode_bitmap(argp, bmval)))
 254                return status;
 255
 256        READ_BUF(4);
 257        READ32(expected_len);
 258
 259        if (bmval[0] & FATTR4_WORD0_SIZE) {
 260                READ_BUF(8);
 261                len += 8;
 262                READ64(iattr->ia_size);
 263                iattr->ia_valid |= ATTR_SIZE;
 264        }
 265        if (bmval[0] & FATTR4_WORD0_ACL) {
 266                int nace;
 267                struct nfs4_ace *ace;
 268
 269                READ_BUF(4); len += 4;
 270                READ32(nace);
 271
 272                if (nace > NFS4_ACL_MAX)
 273                        return nfserr_resource;
 274
 275                *acl = nfs4_acl_new(nace);
 276                if (*acl == NULL) {
 277                        host_err = -ENOMEM;
 278                        goto out_nfserr;
 279                }
 280                defer_free(argp, kfree, *acl);
 281
 282                (*acl)->naces = nace;
 283                for (ace = (*acl)->aces; ace < (*acl)->aces + nace; ace++) {
 284                        READ_BUF(16); len += 16;
 285                        READ32(ace->type);
 286                        READ32(ace->flag);
 287                        READ32(ace->access_mask);
 288                        READ32(dummy32);
 289                        READ_BUF(dummy32);
 290                        len += XDR_QUADLEN(dummy32) << 2;
 291                        READMEM(buf, dummy32);
 292                        ace->whotype = nfs4_acl_get_whotype(buf, dummy32);
 293                        status = nfs_ok;
 294                        if (ace->whotype != NFS4_ACL_WHO_NAMED)
 295                                ace->who = 0;
 296                        else if (ace->flag & NFS4_ACE_IDENTIFIER_GROUP)
 297                                status = nfsd_map_name_to_gid(argp->rqstp,
 298                                                buf, dummy32, &ace->who);
 299                        else
 300                                status = nfsd_map_name_to_uid(argp->rqstp,
 301                                                buf, dummy32, &ace->who);
 302                        if (status)
 303                                return status;
 304                }
 305        } else
 306                *acl = NULL;
 307        if (bmval[1] & FATTR4_WORD1_MODE) {
 308                READ_BUF(4);
 309                len += 4;
 310                READ32(iattr->ia_mode);
 311                iattr->ia_mode &= (S_IFMT | S_IALLUGO);
 312                iattr->ia_valid |= ATTR_MODE;
 313        }
 314        if (bmval[1] & FATTR4_WORD1_OWNER) {
 315                READ_BUF(4);
 316                len += 4;
 317                READ32(dummy32);
 318                READ_BUF(dummy32);
 319                len += (XDR_QUADLEN(dummy32) << 2);
 320                READMEM(buf, dummy32);
 321                if ((status = nfsd_map_name_to_uid(argp->rqstp, buf, dummy32, &iattr->ia_uid)))
 322                        return status;
 323                iattr->ia_valid |= ATTR_UID;
 324        }
 325        if (bmval[1] & FATTR4_WORD1_OWNER_GROUP) {
 326                READ_BUF(4);
 327                len += 4;
 328                READ32(dummy32);
 329                READ_BUF(dummy32);
 330                len += (XDR_QUADLEN(dummy32) << 2);
 331                READMEM(buf, dummy32);
 332                if ((status = nfsd_map_name_to_gid(argp->rqstp, buf, dummy32, &iattr->ia_gid)))
 333                        return status;
 334                iattr->ia_valid |= ATTR_GID;
 335        }
 336        if (bmval[1] & FATTR4_WORD1_TIME_ACCESS_SET) {
 337                READ_BUF(4);
 338                len += 4;
 339                READ32(dummy32);
 340                switch (dummy32) {
 341                case NFS4_SET_TO_CLIENT_TIME:
 342                        /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 343                           all 32 bits of 'nseconds'. */
 344                        READ_BUF(12);
 345                        len += 12;
 346                        READ32(dummy32);
 347                        if (dummy32)
 348                                return nfserr_inval;
 349                        READ32(iattr->ia_atime.tv_sec);
 350                        READ32(iattr->ia_atime.tv_nsec);
 351                        if (iattr->ia_atime.tv_nsec >= (u32)1000000000)
 352                                return nfserr_inval;
 353                        iattr->ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
 354                        break;
 355                case NFS4_SET_TO_SERVER_TIME:
 356                        iattr->ia_valid |= ATTR_ATIME;
 357                        break;
 358                default:
 359                        goto xdr_error;
 360                }
 361        }
 362        if (bmval[1] & FATTR4_WORD1_TIME_MODIFY_SET) {
 363                READ_BUF(4);
 364                len += 4;
 365                READ32(dummy32);
 366                switch (dummy32) {
 367                case NFS4_SET_TO_CLIENT_TIME:
 368                        /* We require the high 32 bits of 'seconds' to be 0, and we ignore
 369                           all 32 bits of 'nseconds'. */
 370                        READ_BUF(12);
 371                        len += 12;
 372                        READ32(dummy32);
 373                        if (dummy32)
 374                                return nfserr_inval;
 375                        READ32(iattr->ia_mtime.tv_sec);
 376                        READ32(iattr->ia_mtime.tv_nsec);
 377                        if (iattr->ia_mtime.tv_nsec >= (u32)1000000000)
 378                                return nfserr_inval;
 379                        iattr->ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET);
 380                        break;
 381                case NFS4_SET_TO_SERVER_TIME:
 382                        iattr->ia_valid |= ATTR_MTIME;
 383                        break;
 384                default:
 385                        goto xdr_error;
 386                }
 387        }
 388        if (bmval[0] & ~NFSD_WRITEABLE_ATTRS_WORD0
 389            || bmval[1] & ~NFSD_WRITEABLE_ATTRS_WORD1
 390            || bmval[2] & ~NFSD_WRITEABLE_ATTRS_WORD2)
 391                READ_BUF(expected_len - len);
 392        else if (len != expected_len)
 393                goto xdr_error;
 394
 395        DECODE_TAIL;
 396
 397out_nfserr:
 398        status = nfserrno(host_err);
 399        goto out;
 400}
 401
 402static __be32
 403nfsd4_decode_stateid(struct nfsd4_compoundargs *argp, stateid_t *sid)
 404{
 405        DECODE_HEAD;
 406
 407        READ_BUF(sizeof(stateid_t));
 408        READ32(sid->si_generation);
 409        COPYMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
 410
 411        DECODE_TAIL;
 412}
 413
 414static __be32
 415nfsd4_decode_access(struct nfsd4_compoundargs *argp, struct nfsd4_access *access)
 416{
 417        DECODE_HEAD;
 418
 419        READ_BUF(4);
 420        READ32(access->ac_req_access);
 421
 422        DECODE_TAIL;
 423}
 424
 425static __be32 nfsd4_decode_bind_conn_to_session(struct nfsd4_compoundargs *argp, struct nfsd4_bind_conn_to_session *bcts)
 426{
 427        DECODE_HEAD;
 428
 429        READ_BUF(NFS4_MAX_SESSIONID_LEN + 8);
 430        COPYMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
 431        READ32(bcts->dir);
 432        /* XXX: skipping ctsa_use_conn_in_rdma_mode.  Perhaps Tom Tucker
 433         * could help us figure out we should be using it. */
 434        DECODE_TAIL;
 435}
 436
 437static __be32
 438nfsd4_decode_close(struct nfsd4_compoundargs *argp, struct nfsd4_close *close)
 439{
 440        DECODE_HEAD;
 441
 442        READ_BUF(4);
 443        READ32(close->cl_seqid);
 444        return nfsd4_decode_stateid(argp, &close->cl_stateid);
 445
 446        DECODE_TAIL;
 447}
 448
 449
 450static __be32
 451nfsd4_decode_commit(struct nfsd4_compoundargs *argp, struct nfsd4_commit *commit)
 452{
 453        DECODE_HEAD;
 454
 455        READ_BUF(12);
 456        READ64(commit->co_offset);
 457        READ32(commit->co_count);
 458
 459        DECODE_TAIL;
 460}
 461
 462static __be32
 463nfsd4_decode_create(struct nfsd4_compoundargs *argp, struct nfsd4_create *create)
 464{
 465        DECODE_HEAD;
 466
 467        READ_BUF(4);
 468        READ32(create->cr_type);
 469        switch (create->cr_type) {
 470        case NF4LNK:
 471                READ_BUF(4);
 472                READ32(create->cr_linklen);
 473                READ_BUF(create->cr_linklen);
 474                SAVEMEM(create->cr_linkname, create->cr_linklen);
 475                break;
 476        case NF4BLK:
 477        case NF4CHR:
 478                READ_BUF(8);
 479                READ32(create->cr_specdata1);
 480                READ32(create->cr_specdata2);
 481                break;
 482        case NF4SOCK:
 483        case NF4FIFO:
 484        case NF4DIR:
 485        default:
 486                break;
 487        }
 488
 489        READ_BUF(4);
 490        READ32(create->cr_namelen);
 491        READ_BUF(create->cr_namelen);
 492        SAVEMEM(create->cr_name, create->cr_namelen);
 493        if ((status = check_filename(create->cr_name, create->cr_namelen, nfserr_inval)))
 494                return status;
 495
 496        status = nfsd4_decode_fattr(argp, create->cr_bmval, &create->cr_iattr,
 497                                    &create->cr_acl);
 498        if (status)
 499                goto out;
 500
 501        DECODE_TAIL;
 502}
 503
 504static inline __be32
 505nfsd4_decode_delegreturn(struct nfsd4_compoundargs *argp, struct nfsd4_delegreturn *dr)
 506{
 507        return nfsd4_decode_stateid(argp, &dr->dr_stateid);
 508}
 509
 510static inline __be32
 511nfsd4_decode_getattr(struct nfsd4_compoundargs *argp, struct nfsd4_getattr *getattr)
 512{
 513        return nfsd4_decode_bitmap(argp, getattr->ga_bmval);
 514}
 515
 516static __be32
 517nfsd4_decode_link(struct nfsd4_compoundargs *argp, struct nfsd4_link *link)
 518{
 519        DECODE_HEAD;
 520
 521        READ_BUF(4);
 522        READ32(link->li_namelen);
 523        READ_BUF(link->li_namelen);
 524        SAVEMEM(link->li_name, link->li_namelen);
 525        if ((status = check_filename(link->li_name, link->li_namelen, nfserr_inval)))
 526                return status;
 527
 528        DECODE_TAIL;
 529}
 530
 531static __be32
 532nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 533{
 534        DECODE_HEAD;
 535
 536        /*
 537        * type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 538        */
 539        READ_BUF(28);
 540        READ32(lock->lk_type);
 541        if ((lock->lk_type < NFS4_READ_LT) || (lock->lk_type > NFS4_WRITEW_LT))
 542                goto xdr_error;
 543        READ32(lock->lk_reclaim);
 544        READ64(lock->lk_offset);
 545        READ64(lock->lk_length);
 546        READ32(lock->lk_is_new);
 547
 548        if (lock->lk_is_new) {
 549                READ_BUF(4);
 550                READ32(lock->lk_new_open_seqid);
 551                status = nfsd4_decode_stateid(argp, &lock->lk_new_open_stateid);
 552                if (status)
 553                        return status;
 554                READ_BUF(8 + sizeof(clientid_t));
 555                READ32(lock->lk_new_lock_seqid);
 556                COPYMEM(&lock->lk_new_clientid, sizeof(clientid_t));
 557                READ32(lock->lk_new_owner.len);
 558                READ_BUF(lock->lk_new_owner.len);
 559                READMEM(lock->lk_new_owner.data, lock->lk_new_owner.len);
 560        } else {
 561                status = nfsd4_decode_stateid(argp, &lock->lk_old_lock_stateid);
 562                if (status)
 563                        return status;
 564                READ_BUF(4);
 565                READ32(lock->lk_old_lock_seqid);
 566        }
 567
 568        DECODE_TAIL;
 569}
 570
 571static __be32
 572nfsd4_decode_lockt(struct nfsd4_compoundargs *argp, struct nfsd4_lockt *lockt)
 573{
 574        DECODE_HEAD;
 575                        
 576        READ_BUF(32);
 577        READ32(lockt->lt_type);
 578        if((lockt->lt_type < NFS4_READ_LT) || (lockt->lt_type > NFS4_WRITEW_LT))
 579                goto xdr_error;
 580        READ64(lockt->lt_offset);
 581        READ64(lockt->lt_length);
 582        COPYMEM(&lockt->lt_clientid, 8);
 583        READ32(lockt->lt_owner.len);
 584        READ_BUF(lockt->lt_owner.len);
 585        READMEM(lockt->lt_owner.data, lockt->lt_owner.len);
 586
 587        DECODE_TAIL;
 588}
 589
 590static __be32
 591nfsd4_decode_locku(struct nfsd4_compoundargs *argp, struct nfsd4_locku *locku)
 592{
 593        DECODE_HEAD;
 594
 595        READ_BUF(8);
 596        READ32(locku->lu_type);
 597        if ((locku->lu_type < NFS4_READ_LT) || (locku->lu_type > NFS4_WRITEW_LT))
 598                goto xdr_error;
 599        READ32(locku->lu_seqid);
 600        status = nfsd4_decode_stateid(argp, &locku->lu_stateid);
 601        if (status)
 602                return status;
 603        READ_BUF(16);
 604        READ64(locku->lu_offset);
 605        READ64(locku->lu_length);
 606
 607        DECODE_TAIL;
 608}
 609
 610static __be32
 611nfsd4_decode_lookup(struct nfsd4_compoundargs *argp, struct nfsd4_lookup *lookup)
 612{
 613        DECODE_HEAD;
 614
 615        READ_BUF(4);
 616        READ32(lookup->lo_len);
 617        READ_BUF(lookup->lo_len);
 618        SAVEMEM(lookup->lo_name, lookup->lo_len);
 619        if ((status = check_filename(lookup->lo_name, lookup->lo_len, nfserr_noent)))
 620                return status;
 621
 622        DECODE_TAIL;
 623}
 624
 625static __be32 nfsd4_decode_share_access(struct nfsd4_compoundargs *argp, u32 *share_access, u32 *deleg_want, u32 *deleg_when)
 626{
 627        __be32 *p;
 628        u32 w;
 629
 630        READ_BUF(4);
 631        READ32(w);
 632        *share_access = w & NFS4_SHARE_ACCESS_MASK;
 633        *deleg_want = w & NFS4_SHARE_WANT_MASK;
 634        if (deleg_when)
 635                *deleg_when = w & NFS4_SHARE_WHEN_MASK;
 636
 637        switch (w & NFS4_SHARE_ACCESS_MASK) {
 638        case NFS4_SHARE_ACCESS_READ:
 639        case NFS4_SHARE_ACCESS_WRITE:
 640        case NFS4_SHARE_ACCESS_BOTH:
 641                break;
 642        default:
 643                return nfserr_bad_xdr;
 644        }
 645        w &= ~NFS4_SHARE_ACCESS_MASK;
 646        if (!w)
 647                return nfs_ok;
 648        if (!argp->minorversion)
 649                return nfserr_bad_xdr;
 650        switch (w & NFS4_SHARE_WANT_MASK) {
 651        case NFS4_SHARE_WANT_NO_PREFERENCE:
 652        case NFS4_SHARE_WANT_READ_DELEG:
 653        case NFS4_SHARE_WANT_WRITE_DELEG:
 654        case NFS4_SHARE_WANT_ANY_DELEG:
 655        case NFS4_SHARE_WANT_NO_DELEG:
 656        case NFS4_SHARE_WANT_CANCEL:
 657                break;
 658        default:
 659                return nfserr_bad_xdr;
 660        }
 661        w &= ~NFS4_SHARE_WANT_MASK;
 662        if (!w)
 663                return nfs_ok;
 664
 665        if (!deleg_when)        /* open_downgrade */
 666                return nfserr_inval;
 667        switch (w) {
 668        case NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL:
 669        case NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED:
 670        case (NFS4_SHARE_SIGNAL_DELEG_WHEN_RESRC_AVAIL |
 671              NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED):
 672                return nfs_ok;
 673        }
 674xdr_error:
 675        return nfserr_bad_xdr;
 676}
 677
 678static __be32 nfsd4_decode_share_deny(struct nfsd4_compoundargs *argp, u32 *x)
 679{
 680        __be32 *p;
 681
 682        READ_BUF(4);
 683        READ32(*x);
 684        /* Note: unlinke access bits, deny bits may be zero. */
 685        if (*x & ~NFS4_SHARE_DENY_BOTH)
 686                return nfserr_bad_xdr;
 687        return nfs_ok;
 688xdr_error:
 689        return nfserr_bad_xdr;
 690}
 691
 692static __be32 nfsd4_decode_opaque(struct nfsd4_compoundargs *argp, struct xdr_netobj *o)
 693{
 694        __be32 *p;
 695
 696        READ_BUF(4);
 697        READ32(o->len);
 698
 699        if (o->len == 0 || o->len > NFS4_OPAQUE_LIMIT)
 700                return nfserr_bad_xdr;
 701
 702        READ_BUF(o->len);
 703        SAVEMEM(o->data, o->len);
 704        return nfs_ok;
 705xdr_error:
 706        return nfserr_bad_xdr;
 707}
 708
 709static __be32
 710nfsd4_decode_open(struct nfsd4_compoundargs *argp, struct nfsd4_open *open)
 711{
 712        DECODE_HEAD;
 713        u32 dummy;
 714
 715        memset(open->op_bmval, 0, sizeof(open->op_bmval));
 716        open->op_iattr.ia_valid = 0;
 717        open->op_openowner = NULL;
 718
 719        /* seqid, share_access, share_deny, clientid, ownerlen */
 720        READ_BUF(4);
 721        READ32(open->op_seqid);
 722        /* decode, yet ignore deleg_when until supported */
 723        status = nfsd4_decode_share_access(argp, &open->op_share_access,
 724                                           &open->op_deleg_want, &dummy);
 725        if (status)
 726                goto xdr_error;
 727        status = nfsd4_decode_share_deny(argp, &open->op_share_deny);
 728        if (status)
 729                goto xdr_error;
 730        READ_BUF(sizeof(clientid_t));
 731        COPYMEM(&open->op_clientid, sizeof(clientid_t));
 732        status = nfsd4_decode_opaque(argp, &open->op_owner);
 733        if (status)
 734                goto xdr_error;
 735        READ_BUF(4);
 736        READ32(open->op_create);
 737        switch (open->op_create) {
 738        case NFS4_OPEN_NOCREATE:
 739                break;
 740        case NFS4_OPEN_CREATE:
 741                READ_BUF(4);
 742                READ32(open->op_createmode);
 743                switch (open->op_createmode) {
 744                case NFS4_CREATE_UNCHECKED:
 745                case NFS4_CREATE_GUARDED:
 746                        status = nfsd4_decode_fattr(argp, open->op_bmval,
 747                                &open->op_iattr, &open->op_acl);
 748                        if (status)
 749                                goto out;
 750                        break;
 751                case NFS4_CREATE_EXCLUSIVE:
 752                        READ_BUF(NFS4_VERIFIER_SIZE);
 753                        COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 754                        break;
 755                case NFS4_CREATE_EXCLUSIVE4_1:
 756                        if (argp->minorversion < 1)
 757                                goto xdr_error;
 758                        READ_BUF(NFS4_VERIFIER_SIZE);
 759                        COPYMEM(open->op_verf.data, NFS4_VERIFIER_SIZE);
 760                        status = nfsd4_decode_fattr(argp, open->op_bmval,
 761                                &open->op_iattr, &open->op_acl);
 762                        if (status)
 763                                goto out;
 764                        break;
 765                default:
 766                        goto xdr_error;
 767                }
 768                break;
 769        default:
 770                goto xdr_error;
 771        }
 772
 773        /* open_claim */
 774        READ_BUF(4);
 775        READ32(open->op_claim_type);
 776        switch (open->op_claim_type) {
 777        case NFS4_OPEN_CLAIM_NULL:
 778        case NFS4_OPEN_CLAIM_DELEGATE_PREV:
 779                READ_BUF(4);
 780                READ32(open->op_fname.len);
 781                READ_BUF(open->op_fname.len);
 782                SAVEMEM(open->op_fname.data, open->op_fname.len);
 783                if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 784                        return status;
 785                break;
 786        case NFS4_OPEN_CLAIM_PREVIOUS:
 787                READ_BUF(4);
 788                READ32(open->op_delegate_type);
 789                break;
 790        case NFS4_OPEN_CLAIM_DELEGATE_CUR:
 791                status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 792                if (status)
 793                        return status;
 794                READ_BUF(4);
 795                READ32(open->op_fname.len);
 796                READ_BUF(open->op_fname.len);
 797                SAVEMEM(open->op_fname.data, open->op_fname.len);
 798                if ((status = check_filename(open->op_fname.data, open->op_fname.len, nfserr_inval)))
 799                        return status;
 800                break;
 801        case NFS4_OPEN_CLAIM_FH:
 802        case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
 803                if (argp->minorversion < 1)
 804                        goto xdr_error;
 805                /* void */
 806                break;
 807        case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
 808                if (argp->minorversion < 1)
 809                        goto xdr_error;
 810                status = nfsd4_decode_stateid(argp, &open->op_delegate_stateid);
 811                if (status)
 812                        return status;
 813                break;
 814        default:
 815                goto xdr_error;
 816        }
 817
 818        DECODE_TAIL;
 819}
 820
 821static __be32
 822nfsd4_decode_open_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_open_confirm *open_conf)
 823{
 824        DECODE_HEAD;
 825                    
 826        status = nfsd4_decode_stateid(argp, &open_conf->oc_req_stateid);
 827        if (status)
 828                return status;
 829        READ_BUF(4);
 830        READ32(open_conf->oc_seqid);
 831                                                        
 832        DECODE_TAIL;
 833}
 834
 835static __be32
 836nfsd4_decode_open_downgrade(struct nfsd4_compoundargs *argp, struct nfsd4_open_downgrade *open_down)
 837{
 838        DECODE_HEAD;
 839                    
 840        status = nfsd4_decode_stateid(argp, &open_down->od_stateid);
 841        if (status)
 842                return status;
 843        READ_BUF(4);
 844        READ32(open_down->od_seqid);
 845        status = nfsd4_decode_share_access(argp, &open_down->od_share_access,
 846                                           &open_down->od_deleg_want, NULL);
 847        if (status)
 848                return status;
 849        status = nfsd4_decode_share_deny(argp, &open_down->od_share_deny);
 850        if (status)
 851                return status;
 852        DECODE_TAIL;
 853}
 854
 855static __be32
 856nfsd4_decode_putfh(struct nfsd4_compoundargs *argp, struct nfsd4_putfh *putfh)
 857{
 858        DECODE_HEAD;
 859
 860        READ_BUF(4);
 861        READ32(putfh->pf_fhlen);
 862        if (putfh->pf_fhlen > NFS4_FHSIZE)
 863                goto xdr_error;
 864        READ_BUF(putfh->pf_fhlen);
 865        SAVEMEM(putfh->pf_fhval, putfh->pf_fhlen);
 866
 867        DECODE_TAIL;
 868}
 869
 870static __be32
 871nfsd4_decode_read(struct nfsd4_compoundargs *argp, struct nfsd4_read *read)
 872{
 873        DECODE_HEAD;
 874
 875        status = nfsd4_decode_stateid(argp, &read->rd_stateid);
 876        if (status)
 877                return status;
 878        READ_BUF(12);
 879        READ64(read->rd_offset);
 880        READ32(read->rd_length);
 881
 882        DECODE_TAIL;
 883}
 884
 885static __be32
 886nfsd4_decode_readdir(struct nfsd4_compoundargs *argp, struct nfsd4_readdir *readdir)
 887{
 888        DECODE_HEAD;
 889
 890        READ_BUF(24);
 891        READ64(readdir->rd_cookie);
 892        COPYMEM(readdir->rd_verf.data, sizeof(readdir->rd_verf.data));
 893        READ32(readdir->rd_dircount);    /* just in case you needed a useless field... */
 894        READ32(readdir->rd_maxcount);
 895        if ((status = nfsd4_decode_bitmap(argp, readdir->rd_bmval)))
 896                goto out;
 897
 898        DECODE_TAIL;
 899}
 900
 901static __be32
 902nfsd4_decode_remove(struct nfsd4_compoundargs *argp, struct nfsd4_remove *remove)
 903{
 904        DECODE_HEAD;
 905
 906        READ_BUF(4);
 907        READ32(remove->rm_namelen);
 908        READ_BUF(remove->rm_namelen);
 909        SAVEMEM(remove->rm_name, remove->rm_namelen);
 910        if ((status = check_filename(remove->rm_name, remove->rm_namelen, nfserr_noent)))
 911                return status;
 912
 913        DECODE_TAIL;
 914}
 915
 916static __be32
 917nfsd4_decode_rename(struct nfsd4_compoundargs *argp, struct nfsd4_rename *rename)
 918{
 919        DECODE_HEAD;
 920
 921        READ_BUF(4);
 922        READ32(rename->rn_snamelen);
 923        READ_BUF(rename->rn_snamelen + 4);
 924        SAVEMEM(rename->rn_sname, rename->rn_snamelen);
 925        READ32(rename->rn_tnamelen);
 926        READ_BUF(rename->rn_tnamelen);
 927        SAVEMEM(rename->rn_tname, rename->rn_tnamelen);
 928        if ((status = check_filename(rename->rn_sname, rename->rn_snamelen, nfserr_noent)))
 929                return status;
 930        if ((status = check_filename(rename->rn_tname, rename->rn_tnamelen, nfserr_inval)))
 931                return status;
 932
 933        DECODE_TAIL;
 934}
 935
 936static __be32
 937nfsd4_decode_renew(struct nfsd4_compoundargs *argp, clientid_t *clientid)
 938{
 939        DECODE_HEAD;
 940
 941        READ_BUF(sizeof(clientid_t));
 942        COPYMEM(clientid, sizeof(clientid_t));
 943
 944        DECODE_TAIL;
 945}
 946
 947static __be32
 948nfsd4_decode_secinfo(struct nfsd4_compoundargs *argp,
 949                     struct nfsd4_secinfo *secinfo)
 950{
 951        DECODE_HEAD;
 952
 953        READ_BUF(4);
 954        READ32(secinfo->si_namelen);
 955        READ_BUF(secinfo->si_namelen);
 956        SAVEMEM(secinfo->si_name, secinfo->si_namelen);
 957        status = check_filename(secinfo->si_name, secinfo->si_namelen,
 958                                                                nfserr_noent);
 959        if (status)
 960                return status;
 961        DECODE_TAIL;
 962}
 963
 964static __be32
 965nfsd4_decode_secinfo_no_name(struct nfsd4_compoundargs *argp,
 966                     struct nfsd4_secinfo_no_name *sin)
 967{
 968        DECODE_HEAD;
 969
 970        READ_BUF(4);
 971        READ32(sin->sin_style);
 972        DECODE_TAIL;
 973}
 974
 975static __be32
 976nfsd4_decode_setattr(struct nfsd4_compoundargs *argp, struct nfsd4_setattr *setattr)
 977{
 978        __be32 status;
 979
 980        status = nfsd4_decode_stateid(argp, &setattr->sa_stateid);
 981        if (status)
 982                return status;
 983        return nfsd4_decode_fattr(argp, setattr->sa_bmval, &setattr->sa_iattr,
 984                                  &setattr->sa_acl);
 985}
 986
 987static __be32
 988nfsd4_decode_setclientid(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid *setclientid)
 989{
 990        DECODE_HEAD;
 991
 992        READ_BUF(NFS4_VERIFIER_SIZE);
 993        COPYMEM(setclientid->se_verf.data, NFS4_VERIFIER_SIZE);
 994
 995        status = nfsd4_decode_opaque(argp, &setclientid->se_name);
 996        if (status)
 997                return nfserr_bad_xdr;
 998        READ_BUF(8);
 999        READ32(setclientid->se_callback_prog);
1000        READ32(setclientid->se_callback_netid_len);
1001
1002        READ_BUF(setclientid->se_callback_netid_len + 4);
1003        SAVEMEM(setclientid->se_callback_netid_val, setclientid->se_callback_netid_len);
1004        READ32(setclientid->se_callback_addr_len);
1005
1006        READ_BUF(setclientid->se_callback_addr_len + 4);
1007        SAVEMEM(setclientid->se_callback_addr_val, setclientid->se_callback_addr_len);
1008        READ32(setclientid->se_callback_ident);
1009
1010        DECODE_TAIL;
1011}
1012
1013static __be32
1014nfsd4_decode_setclientid_confirm(struct nfsd4_compoundargs *argp, struct nfsd4_setclientid_confirm *scd_c)
1015{
1016        DECODE_HEAD;
1017
1018        READ_BUF(8 + NFS4_VERIFIER_SIZE);
1019        COPYMEM(&scd_c->sc_clientid, 8);
1020        COPYMEM(&scd_c->sc_confirm, NFS4_VERIFIER_SIZE);
1021
1022        DECODE_TAIL;
1023}
1024
1025/* Also used for NVERIFY */
1026static __be32
1027nfsd4_decode_verify(struct nfsd4_compoundargs *argp, struct nfsd4_verify *verify)
1028{
1029#if 0
1030        struct nfsd4_compoundargs save = {
1031                .p = argp->p,
1032                .end = argp->end,
1033                .rqstp = argp->rqstp,
1034        };
1035        u32             ve_bmval[2];
1036        struct iattr    ve_iattr;           /* request */
1037        struct nfs4_acl *ve_acl;            /* request */
1038#endif
1039        DECODE_HEAD;
1040
1041        if ((status = nfsd4_decode_bitmap(argp, verify->ve_bmval)))
1042                goto out;
1043
1044        /* For convenience's sake, we compare raw xdr'd attributes in
1045         * nfsd4_proc_verify; however we still decode here just to return
1046         * correct error in case of bad xdr. */
1047#if 0
1048        status = nfsd4_decode_fattr(ve_bmval, &ve_iattr, &ve_acl);
1049        if (status == nfserr_inval) {
1050                status = nfserrno(status);
1051                goto out;
1052        }
1053#endif
1054        READ_BUF(4);
1055        READ32(verify->ve_attrlen);
1056        READ_BUF(verify->ve_attrlen);
1057        SAVEMEM(verify->ve_attrval, verify->ve_attrlen);
1058
1059        DECODE_TAIL;
1060}
1061
1062static __be32
1063nfsd4_decode_write(struct nfsd4_compoundargs *argp, struct nfsd4_write *write)
1064{
1065        int avail;
1066        int v;
1067        int len;
1068        DECODE_HEAD;
1069
1070        status = nfsd4_decode_stateid(argp, &write->wr_stateid);
1071        if (status)
1072                return status;
1073        READ_BUF(16);
1074        READ64(write->wr_offset);
1075        READ32(write->wr_stable_how);
1076        if (write->wr_stable_how > 2)
1077                goto xdr_error;
1078        READ32(write->wr_buflen);
1079
1080        /* Sorry .. no magic macros for this.. *
1081         * READ_BUF(write->wr_buflen);
1082         * SAVEMEM(write->wr_buf, write->wr_buflen);
1083         */
1084        avail = (char*)argp->end - (char*)argp->p;
1085        if (avail + argp->pagelen < write->wr_buflen) {
1086                dprintk("NFSD: xdr error (%s:%d)\n",
1087                                __FILE__, __LINE__);
1088                goto xdr_error;
1089        }
1090        argp->rqstp->rq_vec[0].iov_base = p;
1091        argp->rqstp->rq_vec[0].iov_len = avail;
1092        v = 0;
1093        len = write->wr_buflen;
1094        while (len > argp->rqstp->rq_vec[v].iov_len) {
1095                len -= argp->rqstp->rq_vec[v].iov_len;
1096                v++;
1097                argp->rqstp->rq_vec[v].iov_base = page_address(argp->pagelist[0]);
1098                argp->pagelist++;
1099                if (argp->pagelen >= PAGE_SIZE) {
1100                        argp->rqstp->rq_vec[v].iov_len = PAGE_SIZE;
1101                        argp->pagelen -= PAGE_SIZE;
1102                } else {
1103                        argp->rqstp->rq_vec[v].iov_len = argp->pagelen;
1104                        argp->pagelen -= len;
1105                }
1106        }
1107        argp->end = (__be32*) (argp->rqstp->rq_vec[v].iov_base + argp->rqstp->rq_vec[v].iov_len);
1108        argp->p = (__be32*)  (argp->rqstp->rq_vec[v].iov_base + (XDR_QUADLEN(len) << 2));
1109        argp->rqstp->rq_vec[v].iov_len = len;
1110        write->wr_vlen = v+1;
1111
1112        DECODE_TAIL;
1113}
1114
1115static __be32
1116nfsd4_decode_release_lockowner(struct nfsd4_compoundargs *argp, struct nfsd4_release_lockowner *rlockowner)
1117{
1118        DECODE_HEAD;
1119
1120        READ_BUF(12);
1121        COPYMEM(&rlockowner->rl_clientid, sizeof(clientid_t));
1122        READ32(rlockowner->rl_owner.len);
1123        READ_BUF(rlockowner->rl_owner.len);
1124        READMEM(rlockowner->rl_owner.data, rlockowner->rl_owner.len);
1125
1126        if (argp->minorversion && !zero_clientid(&rlockowner->rl_clientid))
1127                return nfserr_inval;
1128        DECODE_TAIL;
1129}
1130
1131static __be32
1132nfsd4_decode_exchange_id(struct nfsd4_compoundargs *argp,
1133                         struct nfsd4_exchange_id *exid)
1134{
1135        int dummy, tmp;
1136        DECODE_HEAD;
1137
1138        READ_BUF(NFS4_VERIFIER_SIZE);
1139        COPYMEM(exid->verifier.data, NFS4_VERIFIER_SIZE);
1140
1141        status = nfsd4_decode_opaque(argp, &exid->clname);
1142        if (status)
1143                return nfserr_bad_xdr;
1144
1145        READ_BUF(4);
1146        READ32(exid->flags);
1147
1148        /* Ignore state_protect4_a */
1149        READ_BUF(4);
1150        READ32(exid->spa_how);
1151        switch (exid->spa_how) {
1152        case SP4_NONE:
1153                break;
1154        case SP4_MACH_CRED:
1155                /* spo_must_enforce */
1156                READ_BUF(4);
1157                READ32(dummy);
1158                READ_BUF(dummy * 4);
1159                p += dummy;
1160
1161                /* spo_must_allow */
1162                READ_BUF(4);
1163                READ32(dummy);
1164                READ_BUF(dummy * 4);
1165                p += dummy;
1166                break;
1167        case SP4_SSV:
1168                /* ssp_ops */
1169                READ_BUF(4);
1170                READ32(dummy);
1171                READ_BUF(dummy * 4);
1172                p += dummy;
1173
1174                READ_BUF(4);
1175                READ32(dummy);
1176                READ_BUF(dummy * 4);
1177                p += dummy;
1178
1179                /* ssp_hash_algs<> */
1180                READ_BUF(4);
1181                READ32(tmp);
1182                while (tmp--) {
1183                        READ_BUF(4);
1184                        READ32(dummy);
1185                        READ_BUF(dummy);
1186                        p += XDR_QUADLEN(dummy);
1187                }
1188
1189                /* ssp_encr_algs<> */
1190                READ_BUF(4);
1191                READ32(tmp);
1192                while (tmp--) {
1193                        READ_BUF(4);
1194                        READ32(dummy);
1195                        READ_BUF(dummy);
1196                        p += XDR_QUADLEN(dummy);
1197                }
1198
1199                /* ssp_window and ssp_num_gss_handles */
1200                READ_BUF(8);
1201                READ32(dummy);
1202                READ32(dummy);
1203                break;
1204        default:
1205                goto xdr_error;
1206        }
1207
1208        /* Ignore Implementation ID */
1209        READ_BUF(4);    /* nfs_impl_id4 array length */
1210        READ32(dummy);
1211
1212        if (dummy > 1)
1213                goto xdr_error;
1214
1215        if (dummy == 1) {
1216                /* nii_domain */
1217                READ_BUF(4);
1218                READ32(dummy);
1219                READ_BUF(dummy);
1220                p += XDR_QUADLEN(dummy);
1221
1222                /* nii_name */
1223                READ_BUF(4);
1224                READ32(dummy);
1225                READ_BUF(dummy);
1226                p += XDR_QUADLEN(dummy);
1227
1228                /* nii_date */
1229                READ_BUF(12);
1230                p += 3;
1231        }
1232        DECODE_TAIL;
1233}
1234
1235static __be32
1236nfsd4_decode_create_session(struct nfsd4_compoundargs *argp,
1237                            struct nfsd4_create_session *sess)
1238{
1239        DECODE_HEAD;
1240
1241        u32 dummy;
1242        char *machine_name;
1243        int i;
1244        int nr_secflavs;
1245
1246        READ_BUF(16);
1247        COPYMEM(&sess->clientid, 8);
1248        READ32(sess->seqid);
1249        READ32(sess->flags);
1250
1251        /* Fore channel attrs */
1252        READ_BUF(28);
1253        READ32(dummy); /* headerpadsz is always 0 */
1254        READ32(sess->fore_channel.maxreq_sz);
1255        READ32(sess->fore_channel.maxresp_sz);
1256        READ32(sess->fore_channel.maxresp_cached);
1257        READ32(sess->fore_channel.maxops);
1258        READ32(sess->fore_channel.maxreqs);
1259        READ32(sess->fore_channel.nr_rdma_attrs);
1260        if (sess->fore_channel.nr_rdma_attrs == 1) {
1261                READ_BUF(4);
1262                READ32(sess->fore_channel.rdma_attrs);
1263        } else if (sess->fore_channel.nr_rdma_attrs > 1) {
1264                dprintk("Too many fore channel attr bitmaps!\n");
1265                goto xdr_error;
1266        }
1267
1268        /* Back channel attrs */
1269        READ_BUF(28);
1270        READ32(dummy); /* headerpadsz is always 0 */
1271        READ32(sess->back_channel.maxreq_sz);
1272        READ32(sess->back_channel.maxresp_sz);
1273        READ32(sess->back_channel.maxresp_cached);
1274        READ32(sess->back_channel.maxops);
1275        READ32(sess->back_channel.maxreqs);
1276        READ32(sess->back_channel.nr_rdma_attrs);
1277        if (sess->back_channel.nr_rdma_attrs == 1) {
1278                READ_BUF(4);
1279                READ32(sess->back_channel.rdma_attrs);
1280        } else if (sess->back_channel.nr_rdma_attrs > 1) {
1281                dprintk("Too many back channel attr bitmaps!\n");
1282                goto xdr_error;
1283        }
1284
1285        READ_BUF(8);
1286        READ32(sess->callback_prog);
1287
1288        /* callback_sec_params4 */
1289        READ32(nr_secflavs);
1290        for (i = 0; i < nr_secflavs; ++i) {
1291                READ_BUF(4);
1292                READ32(dummy);
1293                switch (dummy) {
1294                case RPC_AUTH_NULL:
1295                        /* Nothing to read */
1296                        break;
1297                case RPC_AUTH_UNIX:
1298                        READ_BUF(8);
1299                        /* stamp */
1300                        READ32(dummy);
1301
1302                        /* machine name */
1303                        READ32(dummy);
1304                        READ_BUF(dummy);
1305                        SAVEMEM(machine_name, dummy);
1306
1307                        /* uid, gid */
1308                        READ_BUF(8);
1309                        READ32(sess->uid);
1310                        READ32(sess->gid);
1311
1312                        /* more gids */
1313                        READ_BUF(4);
1314                        READ32(dummy);
1315                        READ_BUF(dummy * 4);
1316                        break;
1317                case RPC_AUTH_GSS:
1318                        dprintk("RPC_AUTH_GSS callback secflavor "
1319                                "not supported!\n");
1320                        READ_BUF(8);
1321                        /* gcbp_service */
1322                        READ32(dummy);
1323                        /* gcbp_handle_from_server */
1324                        READ32(dummy);
1325                        READ_BUF(dummy);
1326                        p += XDR_QUADLEN(dummy);
1327                        /* gcbp_handle_from_client */
1328                        READ_BUF(4);
1329                        READ32(dummy);
1330                        READ_BUF(dummy);
1331                        break;
1332                default:
1333                        dprintk("Illegal callback secflavor\n");
1334                        return nfserr_inval;
1335                }
1336        }
1337        DECODE_TAIL;
1338}
1339
1340static __be32
1341nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp,
1342                             struct nfsd4_destroy_session *destroy_session)
1343{
1344        DECODE_HEAD;
1345        READ_BUF(NFS4_MAX_SESSIONID_LEN);
1346        COPYMEM(destroy_session->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1347
1348        DECODE_TAIL;
1349}
1350
1351static __be32
1352nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,
1353                          struct nfsd4_free_stateid *free_stateid)
1354{
1355        DECODE_HEAD;
1356
1357        READ_BUF(sizeof(stateid_t));
1358        READ32(free_stateid->fr_stateid.si_generation);
1359        COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));
1360
1361        DECODE_TAIL;
1362}
1363
1364static __be32
1365nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
1366                      struct nfsd4_sequence *seq)
1367{
1368        DECODE_HEAD;
1369
1370        READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
1371        COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
1372        READ32(seq->seqid);
1373        READ32(seq->slotid);
1374        READ32(seq->maxslots);
1375        READ32(seq->cachethis);
1376
1377        DECODE_TAIL;
1378}
1379
1380static __be32
1381nfsd4_decode_test_stateid(struct nfsd4_compoundargs *argp, struct nfsd4_test_stateid *test_stateid)
1382{
1383        int i;
1384        __be32 *p, status;
1385        struct nfsd4_test_stateid_id *stateid;
1386
1387        READ_BUF(4);
1388        test_stateid->ts_num_ids = ntohl(*p++);
1389
1390        INIT_LIST_HEAD(&test_stateid->ts_stateid_list);
1391
1392        for (i = 0; i < test_stateid->ts_num_ids; i++) {
1393                stateid = kmalloc(sizeof(struct nfsd4_test_stateid_id), GFP_KERNEL);
1394                if (!stateid) {
1395                        status = nfserrno(-ENOMEM);
1396                        goto out;
1397                }
1398
1399                defer_free(argp, kfree, stateid);
1400                INIT_LIST_HEAD(&stateid->ts_id_list);
1401                list_add_tail(&stateid->ts_id_list, &test_stateid->ts_stateid_list);
1402
1403                status = nfsd4_decode_stateid(argp, &stateid->ts_id_stateid);
1404                if (status)
1405                        goto out;
1406        }
1407
1408        status = 0;
1409out:
1410        return status;
1411xdr_error:
1412        dprintk("NFSD: xdr error (%s:%d)\n", __FILE__, __LINE__);
1413        status = nfserr_bad_xdr;
1414        goto out;
1415}
1416
1417static __be32 nfsd4_decode_destroy_clientid(struct nfsd4_compoundargs *argp, struct nfsd4_destroy_clientid *dc)
1418{
1419        DECODE_HEAD;
1420
1421        READ_BUF(8);
1422        COPYMEM(&dc->clientid, 8);
1423
1424        DECODE_TAIL;
1425}
1426
1427static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, struct nfsd4_reclaim_complete *rc)
1428{
1429        DECODE_HEAD;
1430
1431        READ_BUF(4);
1432        READ32(rc->rca_one_fs);
1433
1434        DECODE_TAIL;
1435}
1436
1437static __be32
1438nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p)
1439{
1440        return nfs_ok;
1441}
1442
1443static __be32
1444nfsd4_decode_notsupp(struct nfsd4_compoundargs *argp, void *p)
1445{
1446        return nfserr_notsupp;
1447}
1448
1449typedef __be32(*nfsd4_dec)(struct nfsd4_compoundargs *argp, void *);
1450
1451static nfsd4_dec nfsd4_dec_ops[] = {
1452        [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1453        [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1454        [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1455        [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1456        [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1457        [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1458        [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1459        [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1460        [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1461        [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1462        [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1463        [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1464        [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1465        [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1466        [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1467        [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1468        [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1469        [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_open_confirm,
1470        [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1471        [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1472        [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_noop,
1473        [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1474        [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1475        [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1476        [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1477        [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1478        [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1479        [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_renew,
1480        [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1481        [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1482        [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1483        [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1484        [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_setclientid,
1485        [OP_SETCLIENTID_CONFIRM] = (nfsd4_dec)nfsd4_decode_setclientid_confirm,
1486        [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1487        [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1488        [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_release_lockowner,
1489};
1490
1491static nfsd4_dec nfsd41_dec_ops[] = {
1492        [OP_ACCESS]             = (nfsd4_dec)nfsd4_decode_access,
1493        [OP_CLOSE]              = (nfsd4_dec)nfsd4_decode_close,
1494        [OP_COMMIT]             = (nfsd4_dec)nfsd4_decode_commit,
1495        [OP_CREATE]             = (nfsd4_dec)nfsd4_decode_create,
1496        [OP_DELEGPURGE]         = (nfsd4_dec)nfsd4_decode_notsupp,
1497        [OP_DELEGRETURN]        = (nfsd4_dec)nfsd4_decode_delegreturn,
1498        [OP_GETATTR]            = (nfsd4_dec)nfsd4_decode_getattr,
1499        [OP_GETFH]              = (nfsd4_dec)nfsd4_decode_noop,
1500        [OP_LINK]               = (nfsd4_dec)nfsd4_decode_link,
1501        [OP_LOCK]               = (nfsd4_dec)nfsd4_decode_lock,
1502        [OP_LOCKT]              = (nfsd4_dec)nfsd4_decode_lockt,
1503        [OP_LOCKU]              = (nfsd4_dec)nfsd4_decode_locku,
1504        [OP_LOOKUP]             = (nfsd4_dec)nfsd4_decode_lookup,
1505        [OP_LOOKUPP]            = (nfsd4_dec)nfsd4_decode_noop,
1506        [OP_NVERIFY]            = (nfsd4_dec)nfsd4_decode_verify,
1507        [OP_OPEN]               = (nfsd4_dec)nfsd4_decode_open,
1508        [OP_OPENATTR]           = (nfsd4_dec)nfsd4_decode_notsupp,
1509        [OP_OPEN_CONFIRM]       = (nfsd4_dec)nfsd4_decode_notsupp,
1510        [OP_OPEN_DOWNGRADE]     = (nfsd4_dec)nfsd4_decode_open_downgrade,
1511        [OP_PUTFH]              = (nfsd4_dec)nfsd4_decode_putfh,
1512        [OP_PUTPUBFH]           = (nfsd4_dec)nfsd4_decode_notsupp,
1513        [OP_PUTROOTFH]          = (nfsd4_dec)nfsd4_decode_noop,
1514        [OP_READ]               = (nfsd4_dec)nfsd4_decode_read,
1515        [OP_READDIR]            = (nfsd4_dec)nfsd4_decode_readdir,
1516        [OP_READLINK]           = (nfsd4_dec)nfsd4_decode_noop,
1517        [OP_REMOVE]             = (nfsd4_dec)nfsd4_decode_remove,
1518        [OP_RENAME]             = (nfsd4_dec)nfsd4_decode_rename,
1519        [OP_RENEW]              = (nfsd4_dec)nfsd4_decode_notsupp,
1520        [OP_RESTOREFH]          = (nfsd4_dec)nfsd4_decode_noop,
1521        [OP_SAVEFH]             = (nfsd4_dec)nfsd4_decode_noop,
1522        [OP_SECINFO]            = (nfsd4_dec)nfsd4_decode_secinfo,
1523        [OP_SETATTR]            = (nfsd4_dec)nfsd4_decode_setattr,
1524        [OP_SETCLIENTID]        = (nfsd4_dec)nfsd4_decode_notsupp,
1525        [OP_SETCLIENTID_CONFIRM]= (nfsd4_dec)nfsd4_decode_notsupp,
1526        [OP_VERIFY]             = (nfsd4_dec)nfsd4_decode_verify,
1527        [OP_WRITE]              = (nfsd4_dec)nfsd4_decode_write,
1528        [OP_RELEASE_LOCKOWNER]  = (nfsd4_dec)nfsd4_decode_notsupp,
1529
1530        /* new operations for NFSv4.1 */
1531        [OP_BACKCHANNEL_CTL]    = (nfsd4_dec)nfsd4_decode_notsupp,
1532        [OP_BIND_CONN_TO_SESSION]= (nfsd4_dec)nfsd4_decode_bind_conn_to_session,
1533        [OP_EXCHANGE_ID]        = (nfsd4_dec)nfsd4_decode_exchange_id,
1534        [OP_CREATE_SESSION]     = (nfsd4_dec)nfsd4_decode_create_session,
1535        [OP_DESTROY_SESSION]    = (nfsd4_dec)nfsd4_decode_destroy_session,
1536        [OP_FREE_STATEID]       = (nfsd4_dec)nfsd4_decode_free_stateid,
1537        [OP_GET_DIR_DELEGATION] = (nfsd4_dec)nfsd4_decode_notsupp,
1538        [OP_GETDEVICEINFO]      = (nfsd4_dec)nfsd4_decode_notsupp,
1539        [OP_GETDEVICELIST]      = (nfsd4_dec)nfsd4_decode_notsupp,
1540        [OP_LAYOUTCOMMIT]       = (nfsd4_dec)nfsd4_decode_notsupp,
1541        [OP_LAYOUTGET]          = (nfsd4_dec)nfsd4_decode_notsupp,
1542        [OP_LAYOUTRETURN]       = (nfsd4_dec)nfsd4_decode_notsupp,
1543        [OP_SECINFO_NO_NAME]    = (nfsd4_dec)nfsd4_decode_secinfo_no_name,
1544        [OP_SEQUENCE]           = (nfsd4_dec)nfsd4_decode_sequence,
1545        [OP_SET_SSV]            = (nfsd4_dec)nfsd4_decode_notsupp,
1546        [OP_TEST_STATEID]       = (nfsd4_dec)nfsd4_decode_test_stateid,
1547        [OP_WANT_DELEGATION]    = (nfsd4_dec)nfsd4_decode_notsupp,
1548        [OP_DESTROY_CLIENTID]   = (nfsd4_dec)nfsd4_decode_destroy_clientid,
1549        [OP_RECLAIM_COMPLETE]   = (nfsd4_dec)nfsd4_decode_reclaim_complete,
1550};
1551
1552struct nfsd4_minorversion_ops {
1553        nfsd4_dec *decoders;
1554        int nops;
1555};
1556
1557static struct nfsd4_minorversion_ops nfsd4_minorversion[] = {
1558        [0] = { nfsd4_dec_ops, ARRAY_SIZE(nfsd4_dec_ops) },
1559        [1] = { nfsd41_dec_ops, ARRAY_SIZE(nfsd41_dec_ops) },
1560};
1561
1562static __be32
1563nfsd4_decode_compound(struct nfsd4_compoundargs *argp)
1564{
1565        DECODE_HEAD;
1566        struct nfsd4_op *op;
1567        struct nfsd4_minorversion_ops *ops;
1568        bool cachethis = false;
1569        int i;
1570
1571        /*
1572         * XXX: According to spec, we should check the tag
1573         * for UTF-8 compliance.  I'm postponing this for
1574         * now because it seems that some clients do use
1575         * binary tags.
1576         */
1577        READ_BUF(4);
1578        READ32(argp->taglen);
1579        READ_BUF(argp->taglen + 8);
1580        SAVEMEM(argp->tag, argp->taglen);
1581        READ32(argp->minorversion);
1582        READ32(argp->opcnt);
1583
1584        if (argp->taglen > NFSD4_MAX_TAGLEN)
1585                goto xdr_error;
1586        if (argp->opcnt > 100)
1587                goto xdr_error;
1588
1589        if (argp->opcnt > ARRAY_SIZE(argp->iops)) {
1590                argp->ops = kmalloc(argp->opcnt * sizeof(*argp->ops), GFP_KERNEL);
1591                if (!argp->ops) {
1592                        argp->ops = argp->iops;
1593                        dprintk("nfsd: couldn't allocate room for COMPOUND\n");
1594                        goto xdr_error;
1595                }
1596        }
1597
1598        if (argp->minorversion >= ARRAY_SIZE(nfsd4_minorversion))
1599                argp->opcnt = 0;
1600
1601        ops = &nfsd4_minorversion[argp->minorversion];
1602        for (i = 0; i < argp->opcnt; i++) {
1603                op = &argp->ops[i];
1604                op->replay = NULL;
1605
1606                /*
1607                 * We can't use READ_BUF() here because we need to handle
1608                 * a missing opcode as an OP_WRITE + 1. So we need to check
1609                 * to see if we're truly at the end of our buffer or if there
1610                 * is another page we need to flip to.
1611                 */
1612
1613                if (argp->p == argp->end) {
1614                        if (argp->pagelen < 4) {
1615                                /* There isn't an opcode still on the wire */
1616                                op->opnum = OP_WRITE + 1;
1617                                op->status = nfserr_bad_xdr;
1618                                argp->opcnt = i+1;
1619                                break;
1620                        }
1621
1622                        /*
1623                         * False alarm. We just hit a page boundary, but there
1624                         * is still data available.  Move pointer across page
1625                         * boundary.  *snip from READ_BUF*
1626                         */
1627                        argp->p = page_address(argp->pagelist[0]);
1628                        argp->pagelist++;
1629                        if (argp->pagelen < PAGE_SIZE) {
1630                                argp->end = argp->p + (argp->pagelen>>2);
1631                                argp->pagelen = 0;
1632                        } else {
1633                                argp->end = argp->p + (PAGE_SIZE>>2);
1634                                argp->pagelen -= PAGE_SIZE;
1635                        }
1636                }
1637                op->opnum = ntohl(*argp->p++);
1638
1639                if (op->opnum >= FIRST_NFS4_OP && op->opnum <= LAST_NFS4_OP)
1640                        op->status = ops->decoders[op->opnum](argp, &op->u);
1641                else {
1642                        op->opnum = OP_ILLEGAL;
1643                        op->status = nfserr_op_illegal;
1644                }
1645
1646                if (op->status) {
1647                        argp->opcnt = i+1;
1648                        break;
1649                }
1650                /*
1651                 * We'll try to cache the result in the DRC if any one
1652                 * op in the compound wants to be cached:
1653                 */
1654                cachethis |= nfsd4_cache_this_op(op);
1655        }
1656        /* Sessions make the DRC unnecessary: */
1657        if (argp->minorversion)
1658                cachethis = false;
1659        argp->rqstp->rq_cachetype = cachethis ? RC_REPLBUFF : RC_NOCACHE;
1660
1661        DECODE_TAIL;
1662}
1663
1664#define WRITE32(n)               *p++ = htonl(n)
1665#define WRITE64(n)               do {                           \
1666        *p++ = htonl((u32)((n) >> 32));                         \
1667        *p++ = htonl((u32)(n));                                 \
1668} while (0)
1669#define WRITEMEM(ptr,nbytes)     do { if (nbytes > 0) {         \
1670        *(p + XDR_QUADLEN(nbytes) -1) = 0;                      \
1671        memcpy(p, ptr, nbytes);                                 \
1672        p += XDR_QUADLEN(nbytes);                               \
1673}} while (0)
1674
1675static void write32(__be32 **p, u32 n)
1676{
1677        *(*p)++ = htonl(n);
1678}
1679
1680static void write64(__be32 **p, u64 n)
1681{
1682        write32(p, (n >> 32));
1683        write32(p, (u32)n);
1684}
1685
1686static void write_change(__be32 **p, struct kstat *stat, struct inode *inode)
1687{
1688        if (IS_I_VERSION(inode)) {
1689                write64(p, inode->i_version);
1690        } else {
1691                write32(p, stat->ctime.tv_sec);
1692                write32(p, stat->ctime.tv_nsec);
1693        }
1694}
1695
1696static void write_cinfo(__be32 **p, struct nfsd4_change_info *c)
1697{
1698        write32(p, c->atomic);
1699        if (c->change_supported) {
1700                write64(p, c->before_change);
1701                write64(p, c->after_change);
1702        } else {
1703                write32(p, c->before_ctime_sec);
1704                write32(p, c->before_ctime_nsec);
1705                write32(p, c->after_ctime_sec);
1706                write32(p, c->after_ctime_nsec);
1707        }
1708}
1709
1710#define RESERVE_SPACE(nbytes)   do {                            \
1711        p = resp->p;                                            \
1712        BUG_ON(p + XDR_QUADLEN(nbytes) > resp->end);            \
1713} while (0)
1714#define ADJUST_ARGS()           resp->p = p
1715
1716/*
1717 * Header routine to setup seqid operation replay cache
1718 */
1719#define ENCODE_SEQID_OP_HEAD                                    \
1720        __be32 *save;                                           \
1721                                                                \
1722        save = resp->p;
1723
1724/*
1725 * Routine for encoding the result of a "seqid-mutating" NFSv4 operation.  This
1726 * is where sequence id's are incremented, and the replay cache is filled.
1727 * Note that we increment sequence id's here, at the last moment, so we're sure
1728 * we know whether the error to be returned is a sequence id mutating error.
1729 */
1730
1731static void encode_seqid_op_tail(struct nfsd4_compoundres *resp, __be32 *save, __be32 nfserr)
1732{
1733        struct nfs4_stateowner *stateowner = resp->cstate.replay_owner;
1734
1735        if (seqid_mutating_err(ntohl(nfserr)) && stateowner) {
1736                stateowner->so_seqid++;
1737                stateowner->so_replay.rp_status = nfserr;
1738                stateowner->so_replay.rp_buflen =
1739                          (char *)resp->p - (char *)save;
1740                memcpy(stateowner->so_replay.rp_buf, save,
1741                        stateowner->so_replay.rp_buflen);
1742                nfsd4_purge_closed_stateid(stateowner);
1743        }
1744}
1745
1746/* Encode as an array of strings the string given with components
1747 * separated @sep, escaped with esc_enter and esc_exit.
1748 */
1749static __be32 nfsd4_encode_components_esc(char sep, char *components,
1750                                   __be32 **pp, int *buflen,
1751                                   char esc_enter, char esc_exit)
1752{
1753        __be32 *p = *pp;
1754        __be32 *countp = p;
1755        int strlen, count=0;
1756        char *str, *end, *next;
1757
1758        dprintk("nfsd4_encode_components(%s)\n", components);
1759        if ((*buflen -= 4) < 0)
1760                return nfserr_resource;
1761        WRITE32(0); /* We will fill this in with @count later */
1762        end = str = components;
1763        while (*end) {
1764                bool found_esc = false;
1765
1766                /* try to parse as esc_start, ..., esc_end, sep */
1767                if (*str == esc_enter) {
1768                        for (; *end && (*end != esc_exit); end++)
1769                                /* find esc_exit or end of string */;
1770                        next = end + 1;
1771                        if (*end && (!*next || *next == sep)) {
1772                                str++;
1773                                found_esc = true;
1774                        }
1775                }
1776
1777                if (!found_esc)
1778                        for (; *end && (*end != sep); end++)
1779                                /* find sep or end of string */;
1780
1781                strlen = end - str;
1782                if (strlen) {
1783                        if ((*buflen -= ((XDR_QUADLEN(strlen) << 2) + 4)) < 0)
1784                                return nfserr_resource;
1785                        WRITE32(strlen);
1786                        WRITEMEM(str, strlen);
1787                        count++;
1788                }
1789                else
1790                        end++;
1791                str = end;
1792        }
1793        *pp = p;
1794        p = countp;
1795        WRITE32(count);
1796        return 0;
1797}
1798
1799/* Encode as an array of strings the string given with components
1800 * separated @sep.
1801 */
1802static __be32 nfsd4_encode_components(char sep, char *components,
1803                                   __be32 **pp, int *buflen)
1804{
1805        return nfsd4_encode_components_esc(sep, components, pp, buflen, 0, 0);
1806}
1807
1808/*
1809 * encode a location element of a fs_locations structure
1810 */
1811static __be32 nfsd4_encode_fs_location4(struct nfsd4_fs_location *location,
1812                                    __be32 **pp, int *buflen)
1813{
1814        __be32 status;
1815        __be32 *p = *pp;
1816
1817        status = nfsd4_encode_components_esc(':', location->hosts, &p, buflen,
1818                                                '[', ']');
1819        if (status)
1820                return status;
1821        status = nfsd4_encode_components('/', location->path, &p, buflen);
1822        if (status)
1823                return status;
1824        *pp = p;
1825        return 0;
1826}
1827
1828/*
1829 * Encode a path in RFC3530 'pathname4' format
1830 */
1831static __be32 nfsd4_encode_path(const struct path *root,
1832                const struct path *path, __be32 **pp, int *buflen)
1833{
1834        struct path cur = {
1835                .mnt = path->mnt,
1836                .dentry = path->dentry,
1837        };
1838        __be32 *p = *pp;
1839        struct dentry **components = NULL;
1840        unsigned int ncomponents = 0;
1841        __be32 err = nfserr_jukebox;
1842
1843        dprintk("nfsd4_encode_components(");
1844
1845        path_get(&cur);
1846        /* First walk the path up to the nfsd root, and store the
1847         * dentries/path components in an array.
1848         */
1849        for (;;) {
1850                if (cur.dentry == root->dentry && cur.mnt == root->mnt)
1851                        break;
1852                if (cur.dentry == cur.mnt->mnt_root) {
1853                        if (follow_up(&cur))
1854                                continue;
1855                        goto out_free;
1856                }
1857                if ((ncomponents & 15) == 0) {
1858                        struct dentry **new;
1859                        new = krealloc(components,
1860                                        sizeof(*new) * (ncomponents + 16),
1861                                        GFP_KERNEL);
1862                        if (!new)
1863                                goto out_free;
1864                        components = new;
1865                }
1866                components[ncomponents++] = cur.dentry;
1867                cur.dentry = dget_parent(cur.dentry);
1868        }
1869
1870        *buflen -= 4;
1871        if (*buflen < 0)
1872                goto out_free;
1873        WRITE32(ncomponents);
1874
1875        while (ncomponents) {
1876                struct dentry *dentry = components[ncomponents - 1];
1877                unsigned int len = dentry->d_name.len;
1878
1879                *buflen -= 4 + (XDR_QUADLEN(len) << 2);
1880                if (*buflen < 0)
1881                        goto out_free;
1882                WRITE32(len);
1883                WRITEMEM(dentry->d_name.name, len);
1884                dprintk("/%s", dentry->d_name.name);
1885                dput(dentry);
1886                ncomponents--;
1887        }
1888
1889        *pp = p;
1890        err = 0;
1891out_free:
1892        dprintk(")\n");
1893        while (ncomponents)
1894                dput(components[--ncomponents]);
1895        kfree(components);
1896        path_put(&cur);
1897        return err;
1898}
1899
1900static __be32 nfsd4_encode_fsloc_fsroot(struct svc_rqst *rqstp,
1901                const struct path *path, __be32 **pp, int *buflen)
1902{
1903        struct svc_export *exp_ps;
1904        __be32 res;
1905
1906        exp_ps = rqst_find_fsidzero_export(rqstp);
1907        if (IS_ERR(exp_ps))
1908                return nfserrno(PTR_ERR(exp_ps));
1909        res = nfsd4_encode_path(&exp_ps->ex_path, path, pp, buflen);
1910        exp_put(exp_ps);
1911        return res;
1912}
1913
1914/*
1915 *  encode a fs_locations structure
1916 */
1917static __be32 nfsd4_encode_fs_locations(struct svc_rqst *rqstp,
1918                                     struct svc_export *exp,
1919                                     __be32 **pp, int *buflen)
1920{
1921        __be32 status;
1922        int i;
1923        __be32 *p = *pp;
1924        struct nfsd4_fs_locations *fslocs = &exp->ex_fslocs;
1925
1926        status = nfsd4_encode_fsloc_fsroot(rqstp, &exp->ex_path, &p, buflen);
1927        if (status)
1928                return status;
1929        if ((*buflen -= 4) < 0)
1930                return nfserr_resource;
1931        WRITE32(fslocs->locations_count);
1932        for (i=0; i<fslocs->locations_count; i++) {
1933                status = nfsd4_encode_fs_location4(&fslocs->locations[i],
1934                                                   &p, buflen);
1935                if (status)
1936                        return status;
1937        }
1938        *pp = p;
1939        return 0;
1940}
1941
1942static u32 nfs4_file_type(umode_t mode)
1943{
1944        switch (mode & S_IFMT) {
1945        case S_IFIFO:   return NF4FIFO;
1946        case S_IFCHR:   return NF4CHR;
1947        case S_IFDIR:   return NF4DIR;
1948        case S_IFBLK:   return NF4BLK;
1949        case S_IFLNK:   return NF4LNK;
1950        case S_IFREG:   return NF4REG;
1951        case S_IFSOCK:  return NF4SOCK;
1952        default:        return NF4BAD;
1953        };
1954}
1955
1956static __be32
1957nfsd4_encode_name(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1958                        __be32 **p, int *buflen)
1959{
1960        int status;
1961
1962        if (*buflen < (XDR_QUADLEN(IDMAP_NAMESZ) << 2) + 4)
1963                return nfserr_resource;
1964        if (whotype != NFS4_ACL_WHO_NAMED)
1965                status = nfs4_acl_write_who(whotype, (u8 *)(*p + 1));
1966        else if (group)
1967                status = nfsd_map_gid_to_name(rqstp, id, (u8 *)(*p + 1));
1968        else
1969                status = nfsd_map_uid_to_name(rqstp, id, (u8 *)(*p + 1));
1970        if (status < 0)
1971                return nfserrno(status);
1972        *p = xdr_encode_opaque(*p, NULL, status);
1973        *buflen -= (XDR_QUADLEN(status) << 2) + 4;
1974        BUG_ON(*buflen < 0);
1975        return 0;
1976}
1977
1978static inline __be32
1979nfsd4_encode_user(struct svc_rqst *rqstp, uid_t uid, __be32 **p, int *buflen)
1980{
1981        return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, uid, 0, p, buflen);
1982}
1983
1984static inline __be32
1985nfsd4_encode_group(struct svc_rqst *rqstp, uid_t gid, __be32 **p, int *buflen)
1986{
1987        return nfsd4_encode_name(rqstp, NFS4_ACL_WHO_NAMED, gid, 1, p, buflen);
1988}
1989
1990static inline __be32
1991nfsd4_encode_aclname(struct svc_rqst *rqstp, int whotype, uid_t id, int group,
1992                __be32 **p, int *buflen)
1993{
1994        return nfsd4_encode_name(rqstp, whotype, id, group, p, buflen);
1995}
1996
1997#define WORD0_ABSENT_FS_ATTRS (FATTR4_WORD0_FS_LOCATIONS | FATTR4_WORD0_FSID | \
1998                              FATTR4_WORD0_RDATTR_ERROR)
1999#define WORD1_ABSENT_FS_ATTRS FATTR4_WORD1_MOUNTED_ON_FILEID
2000
2001static __be32 fattr_handle_absent_fs(u32 *bmval0, u32 *bmval1, u32 *rdattr_err)
2002{
2003        /* As per referral draft:  */
2004        if (*bmval0 & ~WORD0_ABSENT_FS_ATTRS ||
2005            *bmval1 & ~WORD1_ABSENT_FS_ATTRS) {
2006                if (*bmval0 & FATTR4_WORD0_RDATTR_ERROR ||
2007                    *bmval0 & FATTR4_WORD0_FS_LOCATIONS)
2008                        *rdattr_err = NFSERR_MOVED;
2009                else
2010                        return nfserr_moved;
2011        }
2012        *bmval0 &= WORD0_ABSENT_FS_ATTRS;
2013        *bmval1 &= WORD1_ABSENT_FS_ATTRS;
2014        return 0;
2015}
2016
2017/*
2018 * Note: @fhp can be NULL; in this case, we might have to compose the filehandle
2019 * ourselves.
2020 *
2021 * @countp is the buffer size in _words_; upon successful return this becomes
2022 * replaced with the number of words written.
2023 */
2024__be32
2025nfsd4_encode_fattr(struct svc_fh *fhp, struct svc_export *exp,
2026                struct dentry *dentry, __be32 *buffer, int *countp, u32 *bmval,
2027                struct svc_rqst *rqstp, int ignore_crossmnt)
2028{
2029        u32 bmval0 = bmval[0];
2030        u32 bmval1 = bmval[1];
2031        u32 bmval2 = bmval[2];
2032        struct kstat stat;
2033        struct svc_fh tempfh;
2034        struct kstatfs statfs;
2035        int buflen = *countp << 2;
2036        __be32 *attrlenp;
2037        u32 dummy;
2038        u64 dummy64;
2039        u32 rdattr_err = 0;
2040        __be32 *p = buffer;
2041        __be32 status;
2042        int err;
2043        int aclsupport = 0;
2044        struct nfs4_acl *acl = NULL;
2045        struct nfsd4_compoundres *resp = rqstp->rq_resp;
2046        u32 minorversion = resp->cstate.minorversion;
2047        struct path path = {
2048                .mnt    = exp->ex_path.mnt,
2049                .dentry = dentry,
2050        };
2051
2052        BUG_ON(bmval1 & NFSD_WRITEONLY_ATTRS_WORD1);
2053        BUG_ON(bmval0 & ~nfsd_suppattrs0(minorversion));
2054        BUG_ON(bmval1 & ~nfsd_suppattrs1(minorversion));
2055        BUG_ON(bmval2 & ~nfsd_suppattrs2(minorversion));
2056
2057        if (exp->ex_fslocs.migrated) {
2058                BUG_ON(bmval[2]);
2059                status = fattr_handle_absent_fs(&bmval0, &bmval1, &rdattr_err);
2060                if (status)
2061                        goto out;
2062        }
2063
2064        err = vfs_getattr(exp->ex_path.mnt, dentry, &stat);
2065        if (err)
2066                goto out_nfserr;
2067        if ((bmval0 & (FATTR4_WORD0_FILES_FREE | FATTR4_WORD0_FILES_TOTAL |
2068                        FATTR4_WORD0_MAXNAME)) ||
2069            (bmval1 & (FATTR4_WORD1_SPACE_AVAIL | FATTR4_WORD1_SPACE_FREE |
2070                       FATTR4_WORD1_SPACE_TOTAL))) {
2071                err = vfs_statfs(&path, &statfs);
2072                if (err)
2073                        goto out_nfserr;
2074        }
2075        if ((bmval0 & (FATTR4_WORD0_FILEHANDLE | FATTR4_WORD0_FSID)) && !fhp) {
2076                fh_init(&tempfh, NFS4_FHSIZE);
2077                status = fh_compose(&tempfh, exp, dentry, NULL);
2078                if (status)
2079                        goto out;
2080                fhp = &tempfh;
2081        }
2082        if (bmval0 & (FATTR4_WORD0_ACL | FATTR4_WORD0_ACLSUPPORT
2083                        | FATTR4_WORD0_SUPPORTED_ATTRS)) {
2084                err = nfsd4_get_nfs4_acl(rqstp, dentry, &acl);
2085                aclsupport = (err == 0);
2086                if (bmval0 & FATTR4_WORD0_ACL) {
2087                        if (err == -EOPNOTSUPP)
2088                                bmval0 &= ~FATTR4_WORD0_ACL;
2089                        else if (err == -EINVAL) {
2090                                status = nfserr_attrnotsupp;
2091                                goto out;
2092                        } else if (err != 0)
2093                                goto out_nfserr;
2094                }
2095        }
2096
2097        if (bmval2) {
2098                if ((buflen -= 16) < 0)
2099                        goto out_resource;
2100                WRITE32(3);
2101                WRITE32(bmval0);
2102                WRITE32(bmval1);
2103                WRITE32(bmval2);
2104        } else if (bmval1) {
2105                if ((buflen -= 12) < 0)
2106                        goto out_resource;
2107                WRITE32(2);
2108                WRITE32(bmval0);
2109                WRITE32(bmval1);
2110        } else {
2111                if ((buflen -= 8) < 0)
2112                        goto out_resource;
2113                WRITE32(1);
2114                WRITE32(bmval0);
2115        }
2116        attrlenp = p++;                /* to be backfilled later */
2117
2118        if (bmval0 & FATTR4_WORD0_SUPPORTED_ATTRS) {
2119                u32 word0 = nfsd_suppattrs0(minorversion);
2120                u32 word1 = nfsd_suppattrs1(minorversion);
2121                u32 word2 = nfsd_suppattrs2(minorversion);
2122
2123                if (!aclsupport)
2124                        word0 &= ~FATTR4_WORD0_ACL;
2125                if (!word2) {
2126                        if ((buflen -= 12) < 0)
2127                                goto out_resource;
2128                        WRITE32(2);
2129                        WRITE32(word0);
2130                        WRITE32(word1);
2131                } else {
2132                        if ((buflen -= 16) < 0)
2133                                goto out_resource;
2134                        WRITE32(3);
2135                        WRITE32(word0);
2136                        WRITE32(word1);
2137                        WRITE32(word2);
2138                }
2139        }
2140        if (bmval0 & FATTR4_WORD0_TYPE) {
2141                if ((buflen -= 4) < 0)
2142                        goto out_resource;
2143                dummy = nfs4_file_type(stat.mode);
2144                if (dummy == NF4BAD)
2145                        goto out_serverfault;
2146                WRITE32(dummy);
2147        }
2148        if (bmval0 & FATTR4_WORD0_FH_EXPIRE_TYPE) {
2149                if ((buflen -= 4) < 0)
2150                        goto out_resource;
2151                if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
2152                        WRITE32(NFS4_FH_PERSISTENT);
2153                else
2154                        WRITE32(NFS4_FH_PERSISTENT|NFS4_FH_VOL_RENAME);
2155        }
2156        if (bmval0 & FATTR4_WORD0_CHANGE) {
2157                if ((buflen -= 8) < 0)
2158                        goto out_resource;
2159                write_change(&p, &stat, dentry->d_inode);
2160        }
2161        if (bmval0 & FATTR4_WORD0_SIZE) {
2162                if ((buflen -= 8) < 0)
2163                        goto out_resource;
2164                WRITE64(stat.size);
2165        }
2166        if (bmval0 & FATTR4_WORD0_LINK_SUPPORT) {
2167                if ((buflen -= 4) < 0)
2168                        goto out_resource;
2169                WRITE32(1);
2170        }
2171        if (bmval0 & FATTR4_WORD0_SYMLINK_SUPPORT) {
2172                if ((buflen -= 4) < 0)
2173                        goto out_resource;
2174                WRITE32(1);
2175        }
2176        if (bmval0 & FATTR4_WORD0_NAMED_ATTR) {
2177                if ((buflen -= 4) < 0)
2178                        goto out_resource;
2179                WRITE32(0);
2180        }
2181        if (bmval0 & FATTR4_WORD0_FSID) {
2182                if ((buflen -= 16) < 0)
2183                        goto out_resource;
2184                if (exp->ex_fslocs.migrated) {
2185                        WRITE64(NFS4_REFERRAL_FSID_MAJOR);
2186                        WRITE64(NFS4_REFERRAL_FSID_MINOR);
2187                } else switch(fsid_source(fhp)) {
2188                case FSIDSOURCE_FSID:
2189                        WRITE64((u64)exp->ex_fsid);
2190                        WRITE64((u64)0);
2191                        break;
2192                case FSIDSOURCE_DEV:
2193                        WRITE32(0);
2194                        WRITE32(MAJOR(stat.dev));
2195                        WRITE32(0);
2196                        WRITE32(MINOR(stat.dev));
2197                        break;
2198                case FSIDSOURCE_UUID:
2199                        WRITEMEM(exp->ex_uuid, 16);
2200                        break;
2201                }
2202        }
2203        if (bmval0 & FATTR4_WORD0_UNIQUE_HANDLES) {
2204                if ((buflen -= 4) < 0)
2205                        goto out_resource;
2206                WRITE32(0);
2207        }
2208        if (bmval0 & FATTR4_WORD0_LEASE_TIME) {
2209                if ((buflen -= 4) < 0)
2210                        goto out_resource;
2211                WRITE32(nfsd4_lease);
2212        }
2213        if (bmval0 & FATTR4_WORD0_RDATTR_ERROR) {
2214                if ((buflen -= 4) < 0)
2215                        goto out_resource;
2216                WRITE32(rdattr_err);
2217        }
2218        if (bmval0 & FATTR4_WORD0_ACL) {
2219                struct nfs4_ace *ace;
2220
2221                if (acl == NULL) {
2222                        if ((buflen -= 4) < 0)
2223                                goto out_resource;
2224
2225                        WRITE32(0);
2226                        goto out_acl;
2227                }
2228                if ((buflen -= 4) < 0)
2229                        goto out_resource;
2230                WRITE32(acl->naces);
2231
2232                for (ace = acl->aces; ace < acl->aces + acl->naces; ace++) {
2233                        if ((buflen -= 4*3) < 0)
2234                                goto out_resource;
2235                        WRITE32(ace->type);
2236                        WRITE32(ace->flag);
2237                        WRITE32(ace->access_mask & NFS4_ACE_MASK_ALL);
2238                        status = nfsd4_encode_aclname(rqstp, ace->whotype,
2239                                ace->who, ace->flag & NFS4_ACE_IDENTIFIER_GROUP,
2240                                &p, &buflen);
2241                        if (status == nfserr_resource)
2242                                goto out_resource;
2243                        if (status)
2244                                goto out;
2245                }
2246        }
2247out_acl:
2248        if (bmval0 & FATTR4_WORD0_ACLSUPPORT) {
2249                if ((buflen -= 4) < 0)
2250                        goto out_resource;
2251                WRITE32(aclsupport ?
2252                        ACL4_SUPPORT_ALLOW_ACL|ACL4_SUPPORT_DENY_ACL : 0);
2253        }
2254        if (bmval0 & FATTR4_WORD0_CANSETTIME) {
2255                if ((buflen -= 4) < 0)
2256                        goto out_resource;
2257                WRITE32(1);
2258        }
2259        if (bmval0 & FATTR4_WORD0_CASE_INSENSITIVE) {
2260                if ((buflen -= 4) < 0)
2261                        goto out_resource;
2262                WRITE32(0);
2263        }
2264        if (bmval0 & FATTR4_WORD0_CASE_PRESERVING) {
2265                if ((buflen -= 4) < 0)
2266                        goto out_resource;
2267                WRITE32(1);
2268        }
2269        if (bmval0 & FATTR4_WORD0_CHOWN_RESTRICTED) {
2270                if ((buflen -= 4) < 0)
2271                        goto out_resource;
2272                WRITE32(1);
2273        }
2274        if (bmval0 & FATTR4_WORD0_FILEHANDLE) {
2275                buflen -= (XDR_QUADLEN(fhp->fh_handle.fh_size) << 2) + 4;
2276                if (buflen < 0)
2277                        goto out_resource;
2278                WRITE32(fhp->fh_handle.fh_size);
2279                WRITEMEM(&fhp->fh_handle.fh_base, fhp->fh_handle.fh_size);
2280        }
2281        if (bmval0 & FATTR4_WORD0_FILEID) {
2282                if ((buflen -= 8) < 0)
2283                        goto out_resource;
2284                WRITE64(stat.ino);
2285        }
2286        if (bmval0 & FATTR4_WORD0_FILES_AVAIL) {
2287                if ((buflen -= 8) < 0)
2288                        goto out_resource;
2289                WRITE64((u64) statfs.f_ffree);
2290        }
2291        if (bmval0 & FATTR4_WORD0_FILES_FREE) {
2292                if ((buflen -= 8) < 0)
2293                        goto out_resource;
2294                WRITE64((u64) statfs.f_ffree);
2295        }
2296        if (bmval0 & FATTR4_WORD0_FILES_TOTAL) {
2297                if ((buflen -= 8) < 0)
2298                        goto out_resource;
2299                WRITE64((u64) statfs.f_files);
2300        }
2301        if (bmval0 & FATTR4_WORD0_FS_LOCATIONS) {
2302                status = nfsd4_encode_fs_locations(rqstp, exp, &p, &buflen);
2303                if (status == nfserr_resource)
2304                        goto out_resource;
2305                if (status)
2306                        goto out;
2307        }
2308        if (bmval0 & FATTR4_WORD0_HOMOGENEOUS) {
2309                if ((buflen -= 4) < 0)
2310                        goto out_resource;
2311                WRITE32(1);
2312        }
2313        if (bmval0 & FATTR4_WORD0_MAXFILESIZE) {
2314                if ((buflen -= 8) < 0)
2315                        goto out_resource;
2316                WRITE64(~(u64)0);
2317        }
2318        if (bmval0 & FATTR4_WORD0_MAXLINK) {
2319                if ((buflen -= 4) < 0)
2320                        goto out_resource;
2321                WRITE32(255);
2322        }
2323        if (bmval0 & FATTR4_WORD0_MAXNAME) {
2324                if ((buflen -= 4) < 0)
2325                        goto out_resource;
2326                WRITE32(statfs.f_namelen);
2327        }
2328        if (bmval0 & FATTR4_WORD0_MAXREAD) {
2329                if ((buflen -= 8) < 0)
2330                        goto out_resource;
2331                WRITE64((u64) svc_max_payload(rqstp));
2332        }
2333        if (bmval0 & FATTR4_WORD0_MAXWRITE) {
2334                if ((buflen -= 8) < 0)
2335                        goto out_resource;
2336                WRITE64((u64) svc_max_payload(rqstp));
2337        }
2338        if (bmval1 & FATTR4_WORD1_MODE) {
2339                if ((buflen -= 4) < 0)
2340                        goto out_resource;
2341                WRITE32(stat.mode & S_IALLUGO);
2342        }
2343        if (bmval1 & FATTR4_WORD1_NO_TRUNC) {
2344                if ((buflen -= 4) < 0)
2345                        goto out_resource;
2346                WRITE32(1);
2347        }
2348        if (bmval1 & FATTR4_WORD1_NUMLINKS) {
2349                if ((buflen -= 4) < 0)
2350                        goto out_resource;
2351                WRITE32(stat.nlink);
2352        }
2353        if (bmval1 & FATTR4_WORD1_OWNER) {
2354                status = nfsd4_encode_user(rqstp, stat.uid, &p, &buflen);
2355                if (status == nfserr_resource)
2356                        goto out_resource;
2357                if (status)
2358                        goto out;
2359        }
2360        if (bmval1 & FATTR4_WORD1_OWNER_GROUP) {
2361                status = nfsd4_encode_group(rqstp, stat.gid, &p, &buflen);
2362                if (status == nfserr_resource)
2363                        goto out_resource;
2364                if (status)
2365                        goto out;
2366        }
2367        if (bmval1 & FATTR4_WORD1_RAWDEV) {
2368                if ((buflen -= 8) < 0)
2369                        goto out_resource;
2370                WRITE32((u32) MAJOR(stat.rdev));
2371                WRITE32((u32) MINOR(stat.rdev));
2372        }
2373        if (bmval1 & FATTR4_WORD1_SPACE_AVAIL) {
2374                if ((buflen -= 8) < 0)
2375                        goto out_resource;
2376                dummy64 = (u64)statfs.f_bavail * (u64)statfs.f_bsize;
2377                WRITE64(dummy64);
2378        }
2379        if (bmval1 & FATTR4_WORD1_SPACE_FREE) {
2380                if ((buflen -= 8) < 0)
2381                        goto out_resource;
2382                dummy64 = (u64)statfs.f_bfree * (u64)statfs.f_bsize;
2383                WRITE64(dummy64);
2384        }
2385        if (bmval1 & FATTR4_WORD1_SPACE_TOTAL) {
2386                if ((buflen -= 8) < 0)
2387                        goto out_resource;
2388                dummy64 = (u64)statfs.f_blocks * (u64)statfs.f_bsize;
2389                WRITE64(dummy64);
2390        }
2391        if (bmval1 & FATTR4_WORD1_SPACE_USED) {
2392                if ((buflen -= 8) < 0)
2393                        goto out_resource;
2394                dummy64 = (u64)stat.blocks << 9;
2395                WRITE64(dummy64);
2396        }
2397        if (bmval1 & FATTR4_WORD1_TIME_ACCESS) {
2398                if ((buflen -= 12) < 0)
2399                        goto out_resource;
2400                WRITE32(0);
2401                WRITE32(stat.atime.tv_sec);
2402                WRITE32(stat.atime.tv_nsec);
2403        }
2404        if (bmval1 & FATTR4_WORD1_TIME_DELTA) {
2405                if ((buflen -= 12) < 0)
2406                        goto out_resource;
2407                WRITE32(0);
2408                WRITE32(1);
2409                WRITE32(0);
2410        }
2411        if (bmval1 & FATTR4_WORD1_TIME_METADATA) {
2412                if ((buflen -= 12) < 0)
2413                        goto out_resource;
2414                WRITE32(0);
2415                WRITE32(stat.ctime.tv_sec);
2416                WRITE32(stat.ctime.tv_nsec);
2417        }
2418        if (bmval1 & FATTR4_WORD1_TIME_MODIFY) {
2419                if ((buflen -= 12) < 0)
2420                        goto out_resource;
2421                WRITE32(0);
2422                WRITE32(stat.mtime.tv_sec);
2423                WRITE32(stat.mtime.tv_nsec);
2424        }
2425        if (bmval1 & FATTR4_WORD1_MOUNTED_ON_FILEID) {
2426                if ((buflen -= 8) < 0)
2427                        goto out_resource;
2428                /*
2429                 * Get parent's attributes if not ignoring crossmount
2430                 * and this is the root of a cross-mounted filesystem.
2431                 */
2432                if (ignore_crossmnt == 0 &&
2433                    dentry == exp->ex_path.mnt->mnt_root) {
2434                        struct path path = exp->ex_path;
2435                        path_get(&path);
2436                        while (follow_up(&path)) {
2437                                if (path.dentry != path.mnt->mnt_root)
2438                                        break;
2439                        }
2440                        err = vfs_getattr(path.mnt, path.dentry, &stat);
2441                        path_put(&path);
2442                        if (err)
2443                                goto out_nfserr;
2444                }
2445                WRITE64(stat.ino);
2446        }
2447        if (bmval2 & FATTR4_WORD2_SUPPATTR_EXCLCREAT) {
2448                WRITE32(3);
2449                WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD0);
2450                WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD1);
2451                WRITE32(NFSD_SUPPATTR_EXCLCREAT_WORD2);
2452        }
2453
2454        *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2455        *countp = p - buffer;
2456        status = nfs_ok;
2457
2458out:
2459        kfree(acl);
2460        if (fhp == &tempfh)
2461                fh_put(&tempfh);
2462        return status;
2463out_nfserr:
2464        status = nfserrno(err);
2465        goto out;
2466out_resource:
2467        *countp = 0;
2468        status = nfserr_resource;
2469        goto out;
2470out_serverfault:
2471        status = nfserr_serverfault;
2472        goto out;
2473}
2474
2475static inline int attributes_need_mount(u32 *bmval)
2476{
2477        if (bmval[0] & ~(FATTR4_WORD0_RDATTR_ERROR | FATTR4_WORD0_LEASE_TIME))
2478                return 1;
2479        if (bmval[1] & ~FATTR4_WORD1_MOUNTED_ON_FILEID)
2480                return 1;
2481        return 0;
2482}
2483
2484static __be32
2485nfsd4_encode_dirent_fattr(struct nfsd4_readdir *cd,
2486                const char *name, int namlen, __be32 *p, int *buflen)
2487{
2488        struct svc_export *exp = cd->rd_fhp->fh_export;
2489        struct dentry *dentry;
2490        __be32 nfserr;
2491        int ignore_crossmnt = 0;
2492
2493        dentry = lookup_one_len(name, cd->rd_fhp->fh_dentry, namlen);
2494        if (IS_ERR(dentry))
2495                return nfserrno(PTR_ERR(dentry));
2496        if (!dentry->d_inode) {
2497                /*
2498                 * nfsd_buffered_readdir drops the i_mutex between
2499                 * readdir and calling this callback, leaving a window
2500                 * where this directory entry could have gone away.
2501                 */
2502                dput(dentry);
2503                return nfserr_noent;
2504        }
2505
2506        exp_get(exp);
2507        /*
2508         * In the case of a mountpoint, the client may be asking for
2509         * attributes that are only properties of the underlying filesystem
2510         * as opposed to the cross-mounted file system. In such a case,
2511         * we will not follow the cross mount and will fill the attribtutes
2512         * directly from the mountpoint dentry.
2513         */
2514        if (nfsd_mountpoint(dentry, exp)) {
2515                int err;
2516
2517                if (!(exp->ex_flags & NFSEXP_V4ROOT)
2518                                && !attributes_need_mount(cd->rd_bmval)) {
2519                        ignore_crossmnt = 1;
2520                        goto out_encode;
2521                }
2522                /*
2523                 * Why the heck aren't we just using nfsd_lookup??
2524                 * Different "."/".." handling?  Something else?
2525                 * At least, add a comment here to explain....
2526                 */
2527                err = nfsd_cross_mnt(cd->rd_rqstp, &dentry, &exp);
2528                if (err) {
2529                        nfserr = nfserrno(err);
2530                        goto out_put;
2531                }
2532                nfserr = check_nfsd_access(exp, cd->rd_rqstp);
2533                if (nfserr)
2534                        goto out_put;
2535
2536        }
2537out_encode:
2538        nfserr = nfsd4_encode_fattr(NULL, exp, dentry, p, buflen, cd->rd_bmval,
2539                                        cd->rd_rqstp, ignore_crossmnt);
2540out_put:
2541        dput(dentry);
2542        exp_put(exp);
2543        return nfserr;
2544}
2545
2546static __be32 *
2547nfsd4_encode_rdattr_error(__be32 *p, int buflen, __be32 nfserr)
2548{
2549        __be32 *attrlenp;
2550
2551        if (buflen < 6)
2552                return NULL;
2553        *p++ = htonl(2);
2554        *p++ = htonl(FATTR4_WORD0_RDATTR_ERROR); /* bmval0 */
2555        *p++ = htonl(0);                         /* bmval1 */
2556
2557        attrlenp = p++;
2558        *p++ = nfserr;       /* no htonl */
2559        *attrlenp = htonl((char *)p - (char *)attrlenp - 4);
2560        return p;
2561}
2562
2563static int
2564nfsd4_encode_dirent(void *ccdv, const char *name, int namlen,
2565                    loff_t offset, u64 ino, unsigned int d_type)
2566{
2567        struct readdir_cd *ccd = ccdv;
2568        struct nfsd4_readdir *cd = container_of(ccd, struct nfsd4_readdir, common);
2569        int buflen;
2570        __be32 *p = cd->buffer;
2571        __be32 *cookiep;
2572        __be32 nfserr = nfserr_toosmall;
2573
2574        /* In nfsv4, "." and ".." never make it onto the wire.. */
2575        if (name && isdotent(name, namlen)) {
2576                cd->common.err = nfs_ok;
2577                return 0;
2578        }
2579
2580        if (cd->offset)
2581                xdr_encode_hyper(cd->offset, (u64) offset);
2582
2583        buflen = cd->buflen - 4 - XDR_QUADLEN(namlen);
2584        if (buflen < 0)
2585                goto fail;
2586
2587        *p++ = xdr_one;                             /* mark entry present */
2588        cookiep = p;
2589        p = xdr_encode_hyper(p, NFS_OFFSET_MAX);    /* offset of next entry */
2590        p = xdr_encode_array(p, name, namlen);      /* name length & name */
2591
2592        nfserr = nfsd4_encode_dirent_fattr(cd, name, namlen, p, &buflen);
2593        switch (nfserr) {
2594        case nfs_ok:
2595                p += buflen;
2596                break;
2597        case nfserr_resource:
2598                nfserr = nfserr_toosmall;
2599                goto fail;
2600        case nfserr_noent:
2601                goto skip_entry;
2602        default:
2603                /*
2604                 * If the client requested the RDATTR_ERROR attribute,
2605                 * we stuff the error code into this attribute
2606                 * and continue.  If this attribute was not requested,
2607                 * then in accordance with the spec, we fail the
2608                 * entire READDIR operation(!)
2609                 */
2610                if (!(cd->rd_bmval[0] & FATTR4_WORD0_RDATTR_ERROR))
2611                        goto fail;
2612                p = nfsd4_encode_rdattr_error(p, buflen, nfserr);
2613                if (p == NULL) {
2614                        nfserr = nfserr_toosmall;
2615                        goto fail;
2616                }
2617        }
2618        cd->buflen -= (p - cd->buffer);
2619        cd->buffer = p;
2620        cd->offset = cookiep;
2621skip_entry:
2622        cd->common.err = nfs_ok;
2623        return 0;
2624fail:
2625        cd->common.err = nfserr;
2626        return -EINVAL;
2627}
2628
2629static void
2630nfsd4_encode_stateid(struct nfsd4_compoundres *resp, stateid_t *sid)
2631{
2632        __be32 *p;
2633
2634        RESERVE_SPACE(sizeof(stateid_t));
2635        WRITE32(sid->si_generation);
2636        WRITEMEM(&sid->si_opaque, sizeof(stateid_opaque_t));
2637        ADJUST_ARGS();
2638}
2639
2640static __be32
2641nfsd4_encode_access(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_access *access)
2642{
2643        __be32 *p;
2644
2645        if (!nfserr) {
2646                RESERVE_SPACE(8);
2647                WRITE32(access->ac_supported);
2648                WRITE32(access->ac_resp_access);
2649                ADJUST_ARGS();
2650        }
2651        return nfserr;
2652}
2653
2654static __be32 nfsd4_encode_bind_conn_to_session(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_bind_conn_to_session *bcts)
2655{
2656        __be32 *p;
2657
2658        if (!nfserr) {
2659                RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 8);
2660                WRITEMEM(bcts->sessionid.data, NFS4_MAX_SESSIONID_LEN);
2661                WRITE32(bcts->dir);
2662                /* Sorry, we do not yet support RDMA over 4.1: */
2663                WRITE32(0);
2664                ADJUST_ARGS();
2665        }
2666        return nfserr;
2667}
2668
2669static __be32
2670nfsd4_encode_close(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_close *close)
2671{
2672        ENCODE_SEQID_OP_HEAD;
2673
2674        if (!nfserr)
2675                nfsd4_encode_stateid(resp, &close->cl_stateid);
2676
2677        encode_seqid_op_tail(resp, save, nfserr);
2678        return nfserr;
2679}
2680
2681
2682static __be32
2683nfsd4_encode_commit(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_commit *commit)
2684{
2685        __be32 *p;
2686
2687        if (!nfserr) {
2688                RESERVE_SPACE(NFS4_VERIFIER_SIZE);
2689                WRITEMEM(commit->co_verf.data, NFS4_VERIFIER_SIZE);
2690                ADJUST_ARGS();
2691        }
2692        return nfserr;
2693}
2694
2695static __be32
2696nfsd4_encode_create(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_create *create)
2697{
2698        __be32 *p;
2699
2700        if (!nfserr) {
2701                RESERVE_SPACE(32);
2702                write_cinfo(&p, &create->cr_cinfo);
2703                WRITE32(2);
2704                WRITE32(create->cr_bmval[0]);
2705                WRITE32(create->cr_bmval[1]);
2706                ADJUST_ARGS();
2707        }
2708        return nfserr;
2709}
2710
2711static __be32
2712nfsd4_encode_getattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_getattr *getattr)
2713{
2714        struct svc_fh *fhp = getattr->ga_fhp;
2715        int buflen;
2716
2717        if (nfserr)
2718                return nfserr;
2719
2720        buflen = resp->end - resp->p - (COMPOUND_ERR_SLACK_SPACE >> 2);
2721        nfserr = nfsd4_encode_fattr(fhp, fhp->fh_export, fhp->fh_dentry,
2722                                    resp->p, &buflen, getattr->ga_bmval,
2723                                    resp->rqstp, 0);
2724        if (!nfserr)
2725                resp->p += buflen;
2726        return nfserr;
2727}
2728
2729static __be32
2730nfsd4_encode_getfh(struct nfsd4_compoundres *resp, __be32 nfserr, struct svc_fh **fhpp)
2731{
2732        struct svc_fh *fhp = *fhpp;
2733        unsigned int len;
2734        __be32 *p;
2735
2736        if (!nfserr) {
2737                len = fhp->fh_handle.fh_size;
2738                RESERVE_SPACE(len + 4);
2739                WRITE32(len);
2740                WRITEMEM(&fhp->fh_handle.fh_base, len);
2741                ADJUST_ARGS();
2742        }
2743        return nfserr;
2744}
2745
2746/*
2747* Including all fields other than the name, a LOCK4denied structure requires
2748*   8(clientid) + 4(namelen) + 8(offset) + 8(length) + 4(type) = 32 bytes.
2749*/
2750static void
2751nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denied *ld)
2752{
2753        struct xdr_netobj *conf = &ld->ld_owner;
2754        __be32 *p;
2755
2756        RESERVE_SPACE(32 + XDR_LEN(conf->len));
2757        WRITE64(ld->ld_start);
2758        WRITE64(ld->ld_length);
2759        WRITE32(ld->ld_type);
2760        if (conf->len) {
2761                WRITEMEM(&ld->ld_clientid, 8);
2762                WRITE32(conf->len);
2763                WRITEMEM(conf->data, conf->len);
2764                kfree(conf->data);
2765        }  else {  /* non - nfsv4 lock in conflict, no clientid nor owner */
2766                WRITE64((u64)0); /* clientid */
2767                WRITE32(0); /* length of owner name */
2768        }
2769        ADJUST_ARGS();
2770}
2771
2772static __be32
2773nfsd4_encode_lock(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lock *lock)
2774{
2775        ENCODE_SEQID_OP_HEAD;
2776
2777        if (!nfserr)
2778                nfsd4_encode_stateid(resp, &lock->lk_resp_stateid);
2779        else if (nfserr == nfserr_denied)
2780                nfsd4_encode_lock_denied(resp, &lock->lk_denied);
2781
2782        encode_seqid_op_tail(resp, save, nfserr);
2783        return nfserr;
2784}
2785
2786static __be32
2787nfsd4_encode_lockt(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_lockt *lockt)
2788{
2789        if (nfserr == nfserr_denied)
2790                nfsd4_encode_lock_denied(resp, &lockt->lt_denied);
2791        return nfserr;
2792}
2793
2794static __be32
2795nfsd4_encode_locku(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_locku *locku)
2796{
2797        ENCODE_SEQID_OP_HEAD;
2798
2799        if (!nfserr)
2800                nfsd4_encode_stateid(resp, &locku->lu_stateid);
2801
2802        encode_seqid_op_tail(resp, save, nfserr);
2803        return nfserr;
2804}
2805
2806
2807static __be32
2808nfsd4_encode_link(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_link *link)
2809{
2810        __be32 *p;
2811
2812        if (!nfserr) {
2813                RESERVE_SPACE(20);
2814                write_cinfo(&p, &link->li_cinfo);
2815                ADJUST_ARGS();
2816        }
2817        return nfserr;
2818}
2819
2820
2821static __be32
2822nfsd4_encode_open(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open *open)
2823{
2824        __be32 *p;
2825        ENCODE_SEQID_OP_HEAD;
2826
2827        if (nfserr)
2828                goto out;
2829
2830        nfsd4_encode_stateid(resp, &open->op_stateid);
2831        RESERVE_SPACE(40);
2832        write_cinfo(&p, &open->op_cinfo);
2833        WRITE32(open->op_rflags);
2834        WRITE32(2);
2835        WRITE32(open->op_bmval[0]);
2836        WRITE32(open->op_bmval[1]);
2837        WRITE32(open->op_delegate_type);
2838        ADJUST_ARGS();
2839
2840        switch (open->op_delegate_type) {
2841        case NFS4_OPEN_DELEGATE_NONE:
2842                break;
2843        case NFS4_OPEN_DELEGATE_READ:
2844                nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2845                RESERVE_SPACE(20);
2846                WRITE32(open->op_recall);
2847
2848                /*
2849                 * TODO: ACE's in delegations
2850                 */
2851                WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2852                WRITE32(0);
2853                WRITE32(0);
2854                WRITE32(0);   /* XXX: is NULL principal ok? */
2855                ADJUST_ARGS();
2856                break;
2857        case NFS4_OPEN_DELEGATE_WRITE:
2858                nfsd4_encode_stateid(resp, &open->op_delegate_stateid);
2859                RESERVE_SPACE(32);
2860                WRITE32(0);
2861
2862                /*
2863                 * TODO: space_limit's in delegations
2864                 */
2865                WRITE32(NFS4_LIMIT_SIZE);
2866                WRITE32(~(u32)0);
2867                WRITE32(~(u32)0);
2868
2869                /*
2870                 * TODO: ACE's in delegations
2871                 */
2872                WRITE32(NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE);
2873                WRITE32(0);
2874                WRITE32(0);
2875                WRITE32(0);   /* XXX: is NULL principal ok? */
2876                ADJUST_ARGS();
2877                break;
2878        case NFS4_OPEN_DELEGATE_NONE_EXT: /* 4.1 */
2879                switch (open->op_why_no_deleg) {
2880                case WND4_CONTENTION:
2881                case WND4_RESOURCE:
2882                        RESERVE_SPACE(8);
2883                        WRITE32(open->op_why_no_deleg);
2884                        WRITE32(0);     /* deleg signaling not supported yet */
2885                        break;
2886                default:
2887                        RESERVE_SPACE(4);
2888                        WRITE32(open->op_why_no_deleg);
2889                }
2890                ADJUST_ARGS();
2891                break;
2892        default:
2893                BUG();
2894        }
2895        /* XXX save filehandle here */
2896out:
2897        encode_seqid_op_tail(resp, save, nfserr);
2898        return nfserr;
2899}
2900
2901static __be32
2902nfsd4_encode_open_confirm(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_confirm *oc)
2903{
2904        ENCODE_SEQID_OP_HEAD;
2905
2906        if (!nfserr)
2907                nfsd4_encode_stateid(resp, &oc->oc_resp_stateid);
2908
2909        encode_seqid_op_tail(resp, save, nfserr);
2910        return nfserr;
2911}
2912
2913static __be32
2914nfsd4_encode_open_downgrade(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_open_downgrade *od)
2915{
2916        ENCODE_SEQID_OP_HEAD;
2917
2918        if (!nfserr)
2919                nfsd4_encode_stateid(resp, &od->od_stateid);
2920
2921        encode_seqid_op_tail(resp, save, nfserr);
2922        return nfserr;
2923}
2924
2925static __be32
2926nfsd4_encode_read(struct nfsd4_compoundres *resp, __be32 nfserr,
2927                  struct nfsd4_read *read)
2928{
2929        u32 eof;
2930        int v, pn;
2931        unsigned long maxcount; 
2932        long len;
2933        __be32 *p;
2934
2935        if (nfserr)
2936                return nfserr;
2937        if (resp->xbuf->page_len)
2938                return nfserr_resource;
2939
2940        RESERVE_SPACE(8); /* eof flag and byte count */
2941
2942        maxcount = svc_max_payload(resp->rqstp);
2943        if (maxcount > read->rd_length)
2944                maxcount = read->rd_length;
2945
2946        len = maxcount;
2947        v = 0;
2948        while (len > 0) {
2949                pn = resp->rqstp->rq_resused;
2950                if (!resp->rqstp->rq_respages[pn]) { /* ran out of pages */
2951                        maxcount -= len;
2952                        break;
2953                }
2954                resp->rqstp->rq_vec[v].iov_base =
2955                        page_address(resp->rqstp->rq_respages[pn]);
2956                resp->rqstp->rq_vec[v].iov_len =
2957                        len < PAGE_SIZE ? len : PAGE_SIZE;
2958                resp->rqstp->rq_resused++;
2959                v++;
2960                len -= PAGE_SIZE;
2961        }
2962        read->rd_vlen = v;
2963
2964        nfserr = nfsd_read_file(read->rd_rqstp, read->rd_fhp, read->rd_filp,
2965                        read->rd_offset, resp->rqstp->rq_vec, read->rd_vlen,
2966                        &maxcount);
2967
2968        if (nfserr)
2969                return nfserr;
2970        eof = (read->rd_offset + maxcount >=
2971               read->rd_fhp->fh_dentry->d_inode->i_size);
2972
2973        WRITE32(eof);
2974        WRITE32(maxcount);
2975        ADJUST_ARGS();
2976        resp->xbuf->head[0].iov_len = (char*)p
2977                                        - (char*)resp->xbuf->head[0].iov_base;
2978        resp->xbuf->page_len = maxcount;
2979
2980        /* Use rest of head for padding and remaining ops: */
2981        resp->xbuf->tail[0].iov_base = p;
2982        resp->xbuf->tail[0].iov_len = 0;
2983        if (maxcount&3) {
2984                RESERVE_SPACE(4);
2985                WRITE32(0);
2986                resp->xbuf->tail[0].iov_base += maxcount&3;
2987                resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
2988                ADJUST_ARGS();
2989        }
2990        return 0;
2991}
2992
2993static __be32
2994nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readlink *readlink)
2995{
2996        int maxcount;
2997        char *page;
2998        __be32 *p;
2999
3000        if (nfserr)
3001                return nfserr;
3002        if (resp->xbuf->page_len)
3003                return nfserr_resource;
3004        if (!resp->rqstp->rq_respages[resp->rqstp->rq_resused])
3005                return nfserr_resource;
3006
3007        page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3008
3009        maxcount = PAGE_SIZE;
3010        RESERVE_SPACE(4);
3011
3012        /*
3013         * XXX: By default, the ->readlink() VFS op will truncate symlinks
3014         * if they would overflow the buffer.  Is this kosher in NFSv4?  If
3015         * not, one easy fix is: if ->readlink() precisely fills the buffer,
3016         * assume that truncation occurred, and return NFS4ERR_RESOURCE.
3017         */
3018        nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp, page, &maxcount);
3019        if (nfserr == nfserr_isdir)
3020                return nfserr_inval;
3021        if (nfserr)
3022                return nfserr;
3023
3024        WRITE32(maxcount);
3025        ADJUST_ARGS();
3026        resp->xbuf->head[0].iov_len = (char*)p
3027                                - (char*)resp->xbuf->head[0].iov_base;
3028        resp->xbuf->page_len = maxcount;
3029
3030        /* Use rest of head for padding and remaining ops: */
3031        resp->xbuf->tail[0].iov_base = p;
3032        resp->xbuf->tail[0].iov_len = 0;
3033        if (maxcount&3) {
3034                RESERVE_SPACE(4);
3035                WRITE32(0);
3036                resp->xbuf->tail[0].iov_base += maxcount&3;
3037                resp->xbuf->tail[0].iov_len = 4 - (maxcount&3);
3038                ADJUST_ARGS();
3039        }
3040        return 0;
3041}
3042
3043static __be32
3044nfsd4_encode_readdir(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_readdir *readdir)
3045{
3046        int maxcount;
3047        loff_t offset;
3048        __be32 *page, *savep, *tailbase;
3049        __be32 *p;
3050
3051        if (nfserr)
3052                return nfserr;
3053        if (resp->xbuf->page_len)
3054                return nfserr_resource;
3055        if (!resp->rqstp->rq_respages[resp->rqstp->rq_resused])
3056                return nfserr_resource;
3057
3058        RESERVE_SPACE(NFS4_VERIFIER_SIZE);
3059        savep = p;
3060
3061        /* XXX: Following NFSv3, we ignore the READDIR verifier for now. */
3062        WRITE32(0);
3063        WRITE32(0);
3064        ADJUST_ARGS();
3065        resp->xbuf->head[0].iov_len = ((char*)resp->p) - (char*)resp->xbuf->head[0].iov_base;
3066        tailbase = p;
3067
3068        maxcount = PAGE_SIZE;
3069        if (maxcount > readdir->rd_maxcount)
3070                maxcount = readdir->rd_maxcount;
3071
3072        /*
3073         * Convert from bytes to words, account for the two words already
3074         * written, make sure to leave two words at the end for the next
3075         * pointer and eof field.
3076         */
3077        maxcount = (maxcount >> 2) - 4;
3078        if (maxcount < 0) {
3079                nfserr =  nfserr_toosmall;
3080                goto err_no_verf;
3081        }
3082
3083        page = page_address(resp->rqstp->rq_respages[resp->rqstp->rq_resused++]);
3084        readdir->common.err = 0;
3085        readdir->buflen = maxcount;
3086        readdir->buffer = page;
3087        readdir->offset = NULL;
3088
3089        offset = readdir->rd_cookie;
3090        nfserr = nfsd_readdir(readdir->rd_rqstp, readdir->rd_fhp,
3091                              &offset,
3092                              &readdir->common, nfsd4_encode_dirent);
3093        if (nfserr == nfs_ok &&
3094            readdir->common.err == nfserr_toosmall &&
3095            readdir->buffer == page) 
3096                nfserr = nfserr_toosmall;
3097        if (nfserr)
3098                goto err_no_verf;
3099
3100        if (readdir->offset)
3101                xdr_encode_hyper(readdir->offset, offset);
3102
3103        p = readdir->buffer;
3104        *p++ = 0;       /* no more entries */
3105        *p++ = htonl(readdir->common.err == nfserr_eof);
3106        resp->xbuf->page_len = ((char*)p) - (char*)page_address(
3107                resp->rqstp->rq_respages[resp->rqstp->rq_resused-1]);
3108
3109        /* Use rest of head for padding and remaining ops: */
3110        resp->xbuf->tail[0].iov_base = tailbase;
3111        resp->xbuf->tail[0].iov_len = 0;
3112        resp->p = resp->xbuf->tail[0].iov_base;
3113        resp->end = resp->p + (PAGE_SIZE - resp->xbuf->head[0].iov_len)/4;
3114
3115        return 0;
3116err_no_verf:
3117        p = savep;
3118        ADJUST_ARGS();
3119        return nfserr;
3120}
3121
3122static __be32
3123nfsd4_encode_remove(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_remove *remove)
3124{
3125        __be32 *p;
3126
3127        if (!nfserr) {
3128                RESERVE_SPACE(20);
3129                write_cinfo(&p, &remove->rm_cinfo);
3130                ADJUST_ARGS();
3131        }
3132        return nfserr;
3133}
3134
3135static __be32
3136nfsd4_encode_rename(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_rename *rename)
3137{
3138        __be32 *p;
3139
3140        if (!nfserr) {
3141                RESERVE_SPACE(40);
3142                write_cinfo(&p, &rename->rn_sinfo);
3143                write_cinfo(&p, &rename->rn_tinfo);
3144                ADJUST_ARGS();
3145        }
3146        return nfserr;
3147}
3148
3149static __be32
3150nfsd4_do_encode_secinfo(struct nfsd4_compoundres *resp,
3151                         __be32 nfserr,struct svc_export *exp)
3152{
3153        int i = 0;
3154        u32 nflavs;
3155        struct exp_flavor_info *flavs;
3156        struct exp_flavor_info def_flavs[2];
3157        __be32 *p;
3158
3159        if (nfserr)
3160                goto out;
3161        if (exp->ex_nflavors) {
3162                flavs = exp->ex_flavors;
3163                nflavs = exp->ex_nflavors;
3164        } else { /* Handling of some defaults in absence of real secinfo: */
3165                flavs = def_flavs;
3166                if (exp->ex_client->flavour->flavour == RPC_AUTH_UNIX) {
3167                        nflavs = 2;
3168                        flavs[0].pseudoflavor = RPC_AUTH_UNIX;
3169                        flavs[1].pseudoflavor = RPC_AUTH_NULL;
3170                } else if (exp->ex_client->flavour->flavour == RPC_AUTH_GSS) {
3171                        nflavs = 1;
3172                        flavs[0].pseudoflavor
3173                                        = svcauth_gss_flavor(exp->ex_client);
3174                } else {
3175                        nflavs = 1;
3176                        flavs[0].pseudoflavor
3177                                        = exp->ex_client->flavour->flavour;
3178                }
3179        }
3180
3181        RESERVE_SPACE(4);
3182        WRITE32(nflavs);
3183        ADJUST_ARGS();
3184        for (i = 0; i < nflavs; i++) {
3185                u32 flav = flavs[i].pseudoflavor;
3186                struct gss_api_mech *gm = gss_mech_get_by_pseudoflavor(flav);
3187
3188                if (gm) {
3189                        RESERVE_SPACE(4);
3190                        WRITE32(RPC_AUTH_GSS);
3191                        ADJUST_ARGS();
3192                        RESERVE_SPACE(4 + gm->gm_oid.len);
3193                        WRITE32(gm->gm_oid.len);
3194                        WRITEMEM(gm->gm_oid.data, gm->gm_oid.len);
3195                        ADJUST_ARGS();
3196                        RESERVE_SPACE(4);
3197                        WRITE32(0); /* qop */
3198                        ADJUST_ARGS();
3199                        RESERVE_SPACE(4);
3200                        WRITE32(gss_pseudoflavor_to_service(gm, flav));
3201                        ADJUST_ARGS();
3202                        gss_mech_put(gm);
3203                } else {
3204                        RESERVE_SPACE(4);
3205                        WRITE32(flav);
3206                        ADJUST_ARGS();
3207                }
3208        }
3209out:
3210        if (exp)
3211                exp_put(exp);
3212        return nfserr;
3213}
3214
3215static __be32
3216nfsd4_encode_secinfo(struct nfsd4_compoundres *resp, __be32 nfserr,
3217                     struct nfsd4_secinfo *secinfo)
3218{
3219        return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->si_exp);
3220}
3221
3222static __be32
3223nfsd4_encode_secinfo_no_name(struct nfsd4_compoundres *resp, __be32 nfserr,
3224                     struct nfsd4_secinfo_no_name *secinfo)
3225{
3226        return nfsd4_do_encode_secinfo(resp, nfserr, secinfo->sin_exp);
3227}
3228
3229/*
3230 * The SETATTR encode routine is special -- it always encodes a bitmap,
3231 * regardless of the error status.
3232 */
3233static __be32
3234nfsd4_encode_setattr(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setattr *setattr)
3235{
3236        __be32 *p;
3237
3238        RESERVE_SPACE(12);
3239        if (nfserr) {
3240                WRITE32(2);
3241                WRITE32(0);
3242                WRITE32(0);
3243        }
3244        else {
3245                WRITE32(2);
3246                WRITE32(setattr->sa_bmval[0]);
3247                WRITE32(setattr->sa_bmval[1]);
3248        }
3249        ADJUST_ARGS();
3250        return nfserr;
3251}
3252
3253static __be32
3254nfsd4_encode_setclientid(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_setclientid *scd)
3255{
3256        __be32 *p;
3257
3258        if (!nfserr) {
3259                RESERVE_SPACE(8 + NFS4_VERIFIER_SIZE);
3260                WRITEMEM(&scd->se_clientid, 8);
3261                WRITEMEM(&scd->se_confirm, NFS4_VERIFIER_SIZE);
3262                ADJUST_ARGS();
3263        }
3264        else if (nfserr == nfserr_clid_inuse) {
3265                RESERVE_SPACE(8);
3266                WRITE32(0);
3267                WRITE32(0);
3268                ADJUST_ARGS();
3269        }
3270        return nfserr;
3271}
3272
3273static __be32
3274nfsd4_encode_write(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_write *write)
3275{
3276        __be32 *p;
3277
3278        if (!nfserr) {
3279                RESERVE_SPACE(16);
3280                WRITE32(write->wr_bytes_written);
3281                WRITE32(write->wr_how_written);
3282                WRITEMEM(write->wr_verifier.data, NFS4_VERIFIER_SIZE);
3283                ADJUST_ARGS();
3284        }
3285        return nfserr;
3286}
3287
3288static __be32
3289nfsd4_encode_exchange_id(struct nfsd4_compoundres *resp, __be32 nfserr,
3290                         struct nfsd4_exchange_id *exid)
3291{
3292        __be32 *p;
3293        char *major_id;
3294        char *server_scope;
3295        int major_id_sz;
3296        int server_scope_sz;
3297        uint64_t minor_id = 0;
3298
3299        if (nfserr)
3300                return nfserr;
3301
3302        major_id = utsname()->nodename;
3303        major_id_sz = strlen(major_id);
3304        server_scope = utsname()->nodename;
3305        server_scope_sz = strlen(server_scope);
3306
3307        RESERVE_SPACE(
3308                8 /* eir_clientid */ +
3309                4 /* eir_sequenceid */ +
3310                4 /* eir_flags */ +
3311                4 /* spr_how (SP4_NONE) */ +
3312                8 /* so_minor_id */ +
3313                4 /* so_major_id.len */ +
3314                (XDR_QUADLEN(major_id_sz) * 4) +
3315                4 /* eir_server_scope.len */ +
3316                (XDR_QUADLEN(server_scope_sz) * 4) +
3317                4 /* eir_server_impl_id.count (0) */);
3318
3319        WRITEMEM(&exid->clientid, 8);
3320        WRITE32(exid->seqid);
3321        WRITE32(exid->flags);
3322
3323        /* state_protect4_r. Currently only support SP4_NONE */
3324        BUG_ON(exid->spa_how != SP4_NONE);
3325        WRITE32(exid->spa_how);
3326
3327        /* The server_owner struct */
3328        WRITE64(minor_id);      /* Minor id */
3329        /* major id */
3330        WRITE32(major_id_sz);
3331        WRITEMEM(major_id, major_id_sz);
3332
3333        /* Server scope */
3334        WRITE32(server_scope_sz);
3335        WRITEMEM(server_scope, server_scope_sz);
3336
3337        /* Implementation id */
3338        WRITE32(0);     /* zero length nfs_impl_id4 array */
3339        ADJUST_ARGS();
3340        return 0;
3341}
3342
3343static __be32
3344nfsd4_encode_create_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3345                            struct nfsd4_create_session *sess)
3346{
3347        __be32 *p;
3348
3349        if (nfserr)
3350                return nfserr;
3351
3352        RESERVE_SPACE(24);
3353        WRITEMEM(sess->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3354        WRITE32(sess->seqid);
3355        WRITE32(sess->flags);
3356        ADJUST_ARGS();
3357
3358        RESERVE_SPACE(28);
3359        WRITE32(0); /* headerpadsz */
3360        WRITE32(sess->fore_channel.maxreq_sz);
3361        WRITE32(sess->fore_channel.maxresp_sz);
3362        WRITE32(sess->fore_channel.maxresp_cached);
3363        WRITE32(sess->fore_channel.maxops);
3364        WRITE32(sess->fore_channel.maxreqs);
3365        WRITE32(sess->fore_channel.nr_rdma_attrs);
3366        ADJUST_ARGS();
3367
3368        if (sess->fore_channel.nr_rdma_attrs) {
3369                RESERVE_SPACE(4);
3370                WRITE32(sess->fore_channel.rdma_attrs);
3371                ADJUST_ARGS();
3372        }
3373
3374        RESERVE_SPACE(28);
3375        WRITE32(0); /* headerpadsz */
3376        WRITE32(sess->back_channel.maxreq_sz);
3377        WRITE32(sess->back_channel.maxresp_sz);
3378        WRITE32(sess->back_channel.maxresp_cached);
3379        WRITE32(sess->back_channel.maxops);
3380        WRITE32(sess->back_channel.maxreqs);
3381        WRITE32(sess->back_channel.nr_rdma_attrs);
3382        ADJUST_ARGS();
3383
3384        if (sess->back_channel.nr_rdma_attrs) {
3385                RESERVE_SPACE(4);
3386                WRITE32(sess->back_channel.rdma_attrs);
3387                ADJUST_ARGS();
3388        }
3389        return 0;
3390}
3391
3392static __be32
3393nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, __be32 nfserr,
3394                             struct nfsd4_destroy_session *destroy_session)
3395{
3396        return nfserr;
3397}
3398
3399static __be32
3400nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3401                          struct nfsd4_free_stateid *free_stateid)
3402{
3403        __be32 *p;
3404
3405        if (nfserr)
3406                return nfserr;
3407
3408        RESERVE_SPACE(4);
3409        *p++ = nfserr;
3410        ADJUST_ARGS();
3411        return nfserr;
3412}
3413
3414static __be32
3415nfsd4_encode_sequence(struct nfsd4_compoundres *resp, __be32 nfserr,
3416                      struct nfsd4_sequence *seq)
3417{
3418        __be32 *p;
3419
3420        if (nfserr)
3421                return nfserr;
3422
3423        RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
3424        WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
3425        WRITE32(seq->seqid);
3426        WRITE32(seq->slotid);
3427        /* Note slotid's are numbered from zero: */
3428        WRITE32(seq->maxslots - 1); /* sr_highest_slotid */
3429        WRITE32(seq->maxslots - 1); /* sr_target_highest_slotid */
3430        WRITE32(seq->status_flags);
3431
3432        ADJUST_ARGS();
3433        resp->cstate.datap = p; /* DRC cache data pointer */
3434        return 0;
3435}
3436
3437static __be32
3438nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
3439                          struct nfsd4_test_stateid *test_stateid)
3440{
3441        struct nfsd4_test_stateid_id *stateid, *next;
3442        __be32 *p;
3443
3444        RESERVE_SPACE(4 + (4 * test_stateid->ts_num_ids));
3445        *p++ = htonl(test_stateid->ts_num_ids);
3446
3447        list_for_each_entry_safe(stateid, next, &test_stateid->ts_stateid_list, ts_id_list) {
3448                *p++ = stateid->ts_id_status;
3449        }
3450
3451        ADJUST_ARGS();
3452        return nfserr;
3453}
3454
3455static __be32
3456nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p)
3457{
3458        return nfserr;
3459}
3460
3461typedef __be32(* nfsd4_enc)(struct nfsd4_compoundres *, __be32, void *);
3462
3463/*
3464 * Note: nfsd4_enc_ops vector is shared for v4.0 and v4.1
3465 * since we don't need to filter out obsolete ops as this is
3466 * done in the decoding phase.
3467 */
3468static nfsd4_enc nfsd4_enc_ops[] = {
3469        [OP_ACCESS]             = (nfsd4_enc)nfsd4_encode_access,
3470        [OP_CLOSE]              = (nfsd4_enc)nfsd4_encode_close,
3471        [OP_COMMIT]             = (nfsd4_enc)nfsd4_encode_commit,
3472        [OP_CREATE]             = (nfsd4_enc)nfsd4_encode_create,
3473        [OP_DELEGPURGE]         = (nfsd4_enc)nfsd4_encode_noop,
3474        [OP_DELEGRETURN]        = (nfsd4_enc)nfsd4_encode_noop,
3475        [OP_GETATTR]            = (nfsd4_enc)nfsd4_encode_getattr,
3476        [OP_GETFH]              = (nfsd4_enc)nfsd4_encode_getfh,
3477        [OP_LINK]               = (nfsd4_enc)nfsd4_encode_link,
3478        [OP_LOCK]               = (nfsd4_enc)nfsd4_encode_lock,
3479        [OP_LOCKT]              = (nfsd4_enc)nfsd4_encode_lockt,
3480        [OP_LOCKU]              = (nfsd4_enc)nfsd4_encode_locku,
3481        [OP_LOOKUP]             = (nfsd4_enc)nfsd4_encode_noop,
3482        [OP_LOOKUPP]            = (nfsd4_enc)nfsd4_encode_noop,
3483        [OP_NVERIFY]            = (nfsd4_enc)nfsd4_encode_noop,
3484        [OP_OPEN]               = (nfsd4_enc)nfsd4_encode_open,
3485        [OP_OPENATTR]           = (nfsd4_enc)nfsd4_encode_noop,
3486        [OP_OPEN_CONFIRM]       = (nfsd4_enc)nfsd4_encode_open_confirm,
3487        [OP_OPEN_DOWNGRADE]     = (nfsd4_enc)nfsd4_encode_open_downgrade,
3488        [OP_PUTFH]              = (nfsd4_enc)nfsd4_encode_noop,
3489        [OP_PUTPUBFH]           = (nfsd4_enc)nfsd4_encode_noop,
3490        [OP_PUTROOTFH]          = (nfsd4_enc)nfsd4_encode_noop,
3491        [OP_READ]               = (nfsd4_enc)nfsd4_encode_read,
3492        [OP_READDIR]            = (nfsd4_enc)nfsd4_encode_readdir,
3493        [OP_READLINK]           = (nfsd4_enc)nfsd4_encode_readlink,
3494        [OP_REMOVE]             = (nfsd4_enc)nfsd4_encode_remove,
3495        [OP_RENAME]             = (nfsd4_enc)nfsd4_encode_rename,
3496        [OP_RENEW]              = (nfsd4_enc)nfsd4_encode_noop,
3497        [OP_RESTOREFH]          = (nfsd4_enc)nfsd4_encode_noop,
3498        [OP_SAVEFH]             = (nfsd4_enc)nfsd4_encode_noop,
3499        [OP_SECINFO]            = (nfsd4_enc)nfsd4_encode_secinfo,
3500        [OP_SETATTR]            = (nfsd4_enc)nfsd4_encode_setattr,
3501        [OP_SETCLIENTID]        = (nfsd4_enc)nfsd4_encode_setclientid,
3502        [OP_SETCLIENTID_CONFIRM] = (nfsd4_enc)nfsd4_encode_noop,
3503        [OP_VERIFY]             = (nfsd4_enc)nfsd4_encode_noop,
3504        [OP_WRITE]              = (nfsd4_enc)nfsd4_encode_write,
3505        [OP_RELEASE_LOCKOWNER]  = (nfsd4_enc)nfsd4_encode_noop,
3506
3507        /* NFSv4.1 operations */
3508        [OP_BACKCHANNEL_CTL]    = (nfsd4_enc)nfsd4_encode_noop,
3509        [OP_BIND_CONN_TO_SESSION] = (nfsd4_enc)nfsd4_encode_bind_conn_to_session,
3510        [OP_EXCHANGE_ID]        = (nfsd4_enc)nfsd4_encode_exchange_id,
3511        [OP_CREATE_SESSION]     = (nfsd4_enc)nfsd4_encode_create_session,
3512        [OP_DESTROY_SESSION]    = (nfsd4_enc)nfsd4_encode_destroy_session,
3513        [OP_FREE_STATEID]       = (nfsd4_enc)nfsd4_encode_free_stateid,
3514        [OP_GET_DIR_DELEGATION] = (nfsd4_enc)nfsd4_encode_noop,
3515        [OP_GETDEVICEINFO]      = (nfsd4_enc)nfsd4_encode_noop,
3516        [OP_GETDEVICELIST]      = (nfsd4_enc)nfsd4_encode_noop,
3517        [OP_LAYOUTCOMMIT]       = (nfsd4_enc)nfsd4_encode_noop,
3518        [OP_LAYOUTGET]          = (nfsd4_enc)nfsd4_encode_noop,
3519        [OP_LAYOUTRETURN]       = (nfsd4_enc)nfsd4_encode_noop,
3520        [OP_SECINFO_NO_NAME]    = (nfsd4_enc)nfsd4_encode_secinfo_no_name,
3521        [OP_SEQUENCE]           = (nfsd4_enc)nfsd4_encode_sequence,
3522        [OP_SET_SSV]            = (nfsd4_enc)nfsd4_encode_noop,
3523        [OP_TEST_STATEID]       = (nfsd4_enc)nfsd4_encode_test_stateid,
3524        [OP_WANT_DELEGATION]    = (nfsd4_enc)nfsd4_encode_noop,
3525        [OP_DESTROY_CLIENTID]   = (nfsd4_enc)nfsd4_encode_noop,
3526        [OP_RECLAIM_COMPLETE]   = (nfsd4_enc)nfsd4_encode_noop,
3527};
3528
3529/*
3530 * Calculate the total amount of memory that the compound response has taken
3531 * after encoding the current operation with pad.
3532 *
3533 * pad: if operation is non-idempotent, pad was calculate by op_rsize_bop()
3534 *      which was specified at nfsd4_operation, else pad is zero.
3535 *
3536 * Compare this length to the session se_fmaxresp_sz and se_fmaxresp_cached.
3537 *
3538 * Our se_fmaxresp_cached will always be a multiple of PAGE_SIZE, and so
3539 * will be at least a page and will therefore hold the xdr_buf head.
3540 */
3541__be32 nfsd4_check_resp_size(struct nfsd4_compoundres *resp, u32 pad)
3542{
3543        struct xdr_buf *xb = &resp->rqstp->rq_res;
3544        struct nfsd4_session *session = NULL;
3545        struct nfsd4_slot *slot = resp->cstate.slot;
3546        u32 length, tlen = 0;
3547
3548        if (!nfsd4_has_session(&resp->cstate))
3549                return 0;
3550
3551        session = resp->cstate.session;
3552        if (session == NULL)
3553                return 0;
3554
3555        if (xb->page_len == 0) {
3556                length = (char *)resp->p - (char *)xb->head[0].iov_base + pad;
3557        } else {
3558                if (xb->tail[0].iov_base && xb->tail[0].iov_len > 0)
3559                        tlen = (char *)resp->p - (char *)xb->tail[0].iov_base;
3560
3561                length = xb->head[0].iov_len + xb->page_len + tlen + pad;
3562        }
3563        dprintk("%s length %u, xb->page_len %u tlen %u pad %u\n", __func__,
3564                length, xb->page_len, tlen, pad);
3565
3566        if (length > session->se_fchannel.maxresp_sz)
3567                return nfserr_rep_too_big;
3568
3569        if ((slot->sl_flags & NFSD4_SLOT_CACHETHIS) &&
3570            length > session->se_fchannel.maxresp_cached)
3571                return nfserr_rep_too_big_to_cache;
3572
3573        return 0;
3574}
3575
3576void
3577nfsd4_encode_operation(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3578{
3579        __be32 *statp;
3580        __be32 *p;
3581
3582        RESERVE_SPACE(8);
3583        WRITE32(op->opnum);
3584        statp = p++;    /* to be backfilled at the end */
3585        ADJUST_ARGS();
3586
3587        if (op->opnum == OP_ILLEGAL)
3588                goto status;
3589        BUG_ON(op->opnum < 0 || op->opnum >= ARRAY_SIZE(nfsd4_enc_ops) ||
3590               !nfsd4_enc_ops[op->opnum]);
3591        op->status = nfsd4_enc_ops[op->opnum](resp, op->status, &op->u);
3592        /* nfsd4_check_drc_limit guarantees enough room for error status */
3593        if (!op->status)
3594                op->status = nfsd4_check_resp_size(resp, 0);
3595status:
3596        /*
3597         * Note: We write the status directly, instead of using WRITE32(),
3598         * since it is already in network byte order.
3599         */
3600        *statp = op->status;
3601}
3602
3603/* 
3604 * Encode the reply stored in the stateowner reply cache 
3605 * 
3606 * XDR note: do not encode rp->rp_buflen: the buffer contains the
3607 * previously sent already encoded operation.
3608 *
3609 * called with nfs4_lock_state() held
3610 */
3611void
3612nfsd4_encode_replay(struct nfsd4_compoundres *resp, struct nfsd4_op *op)
3613{
3614        __be32 *p;
3615        struct nfs4_replay *rp = op->replay;
3616
3617        BUG_ON(!rp);
3618
3619        RESERVE_SPACE(8);
3620        WRITE32(op->opnum);
3621        *p++ = rp->rp_status;  /* already xdr'ed */
3622        ADJUST_ARGS();
3623
3624        RESERVE_SPACE(rp->rp_buflen);
3625        WRITEMEM(rp->rp_buf, rp->rp_buflen);
3626        ADJUST_ARGS();
3627}
3628
3629int
3630nfs4svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
3631{
3632        return xdr_ressize_check(rqstp, p);
3633}
3634
3635int nfsd4_release_compoundargs(void *rq, __be32 *p, void *resp)
3636{
3637        struct svc_rqst *rqstp = rq;
3638        struct nfsd4_compoundargs *args = rqstp->rq_argp;
3639
3640        if (args->ops != args->iops) {
3641                kfree(args->ops);
3642                args->ops = args->iops;
3643        }
3644        kfree(args->tmpp);
3645        args->tmpp = NULL;
3646        while (args->to_free) {
3647                struct tmpbuf *tb = args->to_free;
3648                args->to_free = tb->next;
3649                tb->release(tb->buf);
3650                kfree(tb);
3651        }
3652        return 1;
3653}
3654
3655int
3656nfs4svc_decode_compoundargs(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundargs *args)
3657{
3658        args->p = p;
3659        args->end = rqstp->rq_arg.head[0].iov_base + rqstp->rq_arg.head[0].iov_len;
3660        args->pagelist = rqstp->rq_arg.pages;
3661        args->pagelen = rqstp->rq_arg.page_len;
3662        args->tmpp = NULL;
3663        args->to_free = NULL;
3664        args->ops = args->iops;
3665        args->rqstp = rqstp;
3666
3667        return !nfsd4_decode_compound(args);
3668}
3669
3670int
3671nfs4svc_encode_compoundres(struct svc_rqst *rqstp, __be32 *p, struct nfsd4_compoundres *resp)
3672{
3673        /*
3674         * All that remains is to write the tag and operation count...
3675         */
3676        struct nfsd4_compound_state *cs = &resp->cstate;
3677        struct kvec *iov;
3678        p = resp->tagp;
3679        *p++ = htonl(resp->taglen);
3680        memcpy(p, resp->tag, resp->taglen);
3681        p += XDR_QUADLEN(resp->taglen);
3682        *p++ = htonl(resp->opcnt);
3683
3684        if (rqstp->rq_res.page_len) 
3685                iov = &rqstp->rq_res.tail[0];
3686        else
3687                iov = &rqstp->rq_res.head[0];
3688        iov->iov_len = ((char*)resp->p) - (char*)iov->iov_base;
3689        BUG_ON(iov->iov_len > PAGE_SIZE);
3690        if (nfsd4_has_session(cs)) {
3691                if (cs->status != nfserr_replay_cache) {
3692                        nfsd4_store_cache_entry(resp);
3693                        cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3694                }
3695                /* Renew the clientid on success and on replay */
3696                release_session_client(cs->session);
3697                nfsd4_put_session(cs->session);
3698        }
3699        return 1;
3700}
3701
3702/*
3703 * Local variables:
3704 *  c-basic-offset: 8
3705 * End:
3706 */
3707
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