linux/fs/nfsd/nfs3xdr.c
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   1/*
   2 * XDR support for nfsd/protocol version 3.
   3 *
   4 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
   5 *
   6 * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
   7 */
   8
   9#include <linux/namei.h>
  10#include "xdr3.h"
  11#include "auth.h"
  12
  13#define NFSDDBG_FACILITY                NFSDDBG_XDR
  14
  15
  16/*
  17 * Mapping of S_IF* types to NFS file types
  18 */
  19static u32      nfs3_ftypes[] = {
  20        NF3NON,  NF3FIFO, NF3CHR, NF3BAD,
  21        NF3DIR,  NF3BAD,  NF3BLK, NF3BAD,
  22        NF3REG,  NF3BAD,  NF3LNK, NF3BAD,
  23        NF3SOCK, NF3BAD,  NF3LNK, NF3BAD,
  24};
  25
  26/*
  27 * XDR functions for basic NFS types
  28 */
  29static __be32 *
  30encode_time3(__be32 *p, struct timespec *time)
  31{
  32        *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
  33        return p;
  34}
  35
  36static __be32 *
  37decode_time3(__be32 *p, struct timespec *time)
  38{
  39        time->tv_sec = ntohl(*p++);
  40        time->tv_nsec = ntohl(*p++);
  41        return p;
  42}
  43
  44static __be32 *
  45decode_fh(__be32 *p, struct svc_fh *fhp)
  46{
  47        unsigned int size;
  48        fh_init(fhp, NFS3_FHSIZE);
  49        size = ntohl(*p++);
  50        if (size > NFS3_FHSIZE)
  51                return NULL;
  52
  53        memcpy(&fhp->fh_handle.fh_base, p, size);
  54        fhp->fh_handle.fh_size = size;
  55        return p + XDR_QUADLEN(size);
  56}
  57
  58/* Helper function for NFSv3 ACL code */
  59__be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
  60{
  61        return decode_fh(p, fhp);
  62}
  63
  64static __be32 *
  65encode_fh(__be32 *p, struct svc_fh *fhp)
  66{
  67        unsigned int size = fhp->fh_handle.fh_size;
  68        *p++ = htonl(size);
  69        if (size) p[XDR_QUADLEN(size)-1]=0;
  70        memcpy(p, &fhp->fh_handle.fh_base, size);
  71        return p + XDR_QUADLEN(size);
  72}
  73
  74/*
  75 * Decode a file name and make sure that the path contains
  76 * no slashes or null bytes.
  77 */
  78static __be32 *
  79decode_filename(__be32 *p, char **namp, unsigned int *lenp)
  80{
  81        char            *name;
  82        unsigned int    i;
  83
  84        if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
  85                for (i = 0, name = *namp; i < *lenp; i++, name++) {
  86                        if (*name == '\0' || *name == '/')
  87                                return NULL;
  88                }
  89        }
  90
  91        return p;
  92}
  93
  94static __be32 *
  95decode_sattr3(__be32 *p, struct iattr *iap)
  96{
  97        u32     tmp;
  98
  99        iap->ia_valid = 0;
 100
 101        if (*p++) {
 102                iap->ia_valid |= ATTR_MODE;
 103                iap->ia_mode = ntohl(*p++);
 104        }
 105        if (*p++) {
 106                iap->ia_valid |= ATTR_UID;
 107                iap->ia_uid = ntohl(*p++);
 108        }
 109        if (*p++) {
 110                iap->ia_valid |= ATTR_GID;
 111                iap->ia_gid = ntohl(*p++);
 112        }
 113        if (*p++) {
 114                u64     newsize;
 115
 116                iap->ia_valid |= ATTR_SIZE;
 117                p = xdr_decode_hyper(p, &newsize);
 118                if (newsize <= NFS_OFFSET_MAX)
 119                        iap->ia_size = newsize;
 120                else
 121                        iap->ia_size = NFS_OFFSET_MAX;
 122        }
 123        if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 124                iap->ia_valid |= ATTR_ATIME;
 125        } else if (tmp == 2) {          /* set to client time */
 126                iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
 127                iap->ia_atime.tv_sec = ntohl(*p++);
 128                iap->ia_atime.tv_nsec = ntohl(*p++);
 129        }
 130        if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 131                iap->ia_valid |= ATTR_MTIME;
 132        } else if (tmp == 2) {          /* set to client time */
 133                iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
 134                iap->ia_mtime.tv_sec = ntohl(*p++);
 135                iap->ia_mtime.tv_nsec = ntohl(*p++);
 136        }
 137        return p;
 138}
 139
 140static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
 141{
 142        u64 f;
 143        switch(fsid_source(fhp)) {
 144        default:
 145        case FSIDSOURCE_DEV:
 146                p = xdr_encode_hyper(p, (u64)huge_encode_dev
 147                                     (fhp->fh_dentry->d_inode->i_sb->s_dev));
 148                break;
 149        case FSIDSOURCE_FSID:
 150                p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
 151                break;
 152        case FSIDSOURCE_UUID:
 153                f = ((u64*)fhp->fh_export->ex_uuid)[0];
 154                f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
 155                p = xdr_encode_hyper(p, f);
 156                break;
 157        }
 158        return p;
 159}
 160
 161static __be32 *
 162encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
 163              struct kstat *stat)
 164{
 165        *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
 166        *p++ = htonl((u32) stat->mode);
 167        *p++ = htonl((u32) stat->nlink);
 168        *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
 169        *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
 170        if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
 171                p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
 172        } else {
 173                p = xdr_encode_hyper(p, (u64) stat->size);
 174        }
 175        p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
 176        *p++ = htonl((u32) MAJOR(stat->rdev));
 177        *p++ = htonl((u32) MINOR(stat->rdev));
 178        p = encode_fsid(p, fhp);
 179        p = xdr_encode_hyper(p, stat->ino);
 180        p = encode_time3(p, &stat->atime);
 181        p = encode_time3(p, &stat->mtime);
 182        p = encode_time3(p, &stat->ctime);
 183
 184        return p;
 185}
 186
 187static __be32 *
 188encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 189{
 190        /* Attributes to follow */
 191        *p++ = xdr_one;
 192        return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
 193}
 194
 195/*
 196 * Encode post-operation attributes.
 197 * The inode may be NULL if the call failed because of a stale file
 198 * handle. In this case, no attributes are returned.
 199 */
 200static __be32 *
 201encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 202{
 203        struct dentry *dentry = fhp->fh_dentry;
 204        if (dentry && dentry->d_inode) {
 205                int err;
 206                struct kstat stat;
 207
 208                err = vfs_getattr(fhp->fh_export->ex_path.mnt, dentry, &stat);
 209                if (!err) {
 210                        *p++ = xdr_one;         /* attributes follow */
 211                        lease_get_mtime(dentry->d_inode, &stat.mtime);
 212                        return encode_fattr3(rqstp, p, fhp, &stat);
 213                }
 214        }
 215        *p++ = xdr_zero;
 216        return p;
 217}
 218
 219/* Helper for NFSv3 ACLs */
 220__be32 *
 221nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 222{
 223        return encode_post_op_attr(rqstp, p, fhp);
 224}
 225
 226/*
 227 * Enocde weak cache consistency data
 228 */
 229static __be32 *
 230encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 231{
 232        struct dentry   *dentry = fhp->fh_dentry;
 233
 234        if (dentry && dentry->d_inode && fhp->fh_post_saved) {
 235                if (fhp->fh_pre_saved) {
 236                        *p++ = xdr_one;
 237                        p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
 238                        p = encode_time3(p, &fhp->fh_pre_mtime);
 239                        p = encode_time3(p, &fhp->fh_pre_ctime);
 240                } else {
 241                        *p++ = xdr_zero;
 242                }
 243                return encode_saved_post_attr(rqstp, p, fhp);
 244        }
 245        /* no pre- or post-attrs */
 246        *p++ = xdr_zero;
 247        return encode_post_op_attr(rqstp, p, fhp);
 248}
 249
 250/*
 251 * Fill in the post_op attr for the wcc data
 252 */
 253void fill_post_wcc(struct svc_fh *fhp)
 254{
 255        int err;
 256
 257        if (fhp->fh_post_saved)
 258                printk("nfsd: inode locked twice during operation.\n");
 259
 260        err = vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry,
 261                        &fhp->fh_post_attr);
 262        fhp->fh_post_change = fhp->fh_dentry->d_inode->i_version;
 263        if (err) {
 264                fhp->fh_post_saved = 0;
 265                /* Grab the ctime anyway - set_change_info might use it */
 266                fhp->fh_post_attr.ctime = fhp->fh_dentry->d_inode->i_ctime;
 267        } else
 268                fhp->fh_post_saved = 1;
 269}
 270
 271/*
 272 * XDR decode functions
 273 */
 274int
 275nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
 276{
 277        if (!(p = decode_fh(p, &args->fh)))
 278                return 0;
 279        return xdr_argsize_check(rqstp, p);
 280}
 281
 282int
 283nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
 284                                        struct nfsd3_sattrargs *args)
 285{
 286        if (!(p = decode_fh(p, &args->fh)))
 287                return 0;
 288        p = decode_sattr3(p, &args->attrs);
 289
 290        if ((args->check_guard = ntohl(*p++)) != 0) { 
 291                struct timespec time; 
 292                p = decode_time3(p, &time);
 293                args->guardtime = time.tv_sec;
 294        }
 295
 296        return xdr_argsize_check(rqstp, p);
 297}
 298
 299int
 300nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
 301                                        struct nfsd3_diropargs *args)
 302{
 303        if (!(p = decode_fh(p, &args->fh))
 304         || !(p = decode_filename(p, &args->name, &args->len)))
 305                return 0;
 306
 307        return xdr_argsize_check(rqstp, p);
 308}
 309
 310int
 311nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
 312                                        struct nfsd3_accessargs *args)
 313{
 314        if (!(p = decode_fh(p, &args->fh)))
 315                return 0;
 316        args->access = ntohl(*p++);
 317
 318        return xdr_argsize_check(rqstp, p);
 319}
 320
 321int
 322nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
 323                                        struct nfsd3_readargs *args)
 324{
 325        unsigned int len;
 326        int v,pn;
 327        u32 max_blocksize = svc_max_payload(rqstp);
 328
 329        if (!(p = decode_fh(p, &args->fh)))
 330                return 0;
 331        p = xdr_decode_hyper(p, &args->offset);
 332
 333        len = args->count = ntohl(*p++);
 334
 335        if (len > max_blocksize)
 336                len = max_blocksize;
 337
 338        /* set up the kvec */
 339        v=0;
 340        while (len > 0) {
 341                pn = rqstp->rq_resused++;
 342                rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
 343                rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
 344                len -= rqstp->rq_vec[v].iov_len;
 345                v++;
 346        }
 347        args->vlen = v;
 348        return xdr_argsize_check(rqstp, p);
 349}
 350
 351int
 352nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
 353                                        struct nfsd3_writeargs *args)
 354{
 355        unsigned int len, v, hdr, dlen;
 356        u32 max_blocksize = svc_max_payload(rqstp);
 357
 358        if (!(p = decode_fh(p, &args->fh)))
 359                return 0;
 360        p = xdr_decode_hyper(p, &args->offset);
 361
 362        args->count = ntohl(*p++);
 363        args->stable = ntohl(*p++);
 364        len = args->len = ntohl(*p++);
 365        /*
 366         * The count must equal the amount of data passed.
 367         */
 368        if (args->count != args->len)
 369                return 0;
 370
 371        /*
 372         * Check to make sure that we got the right number of
 373         * bytes.
 374         */
 375        hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
 376        dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
 377                - hdr;
 378        /*
 379         * Round the length of the data which was specified up to
 380         * the next multiple of XDR units and then compare that
 381         * against the length which was actually received.
 382         * Note that when RPCSEC/GSS (for example) is used, the
 383         * data buffer can be padded so dlen might be larger
 384         * than required.  It must never be smaller.
 385         */
 386        if (dlen < XDR_QUADLEN(len)*4)
 387                return 0;
 388
 389        if (args->count > max_blocksize) {
 390                args->count = max_blocksize;
 391                len = args->len = max_blocksize;
 392        }
 393        rqstp->rq_vec[0].iov_base = (void*)p;
 394        rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
 395        v = 0;
 396        while (len > rqstp->rq_vec[v].iov_len) {
 397                len -= rqstp->rq_vec[v].iov_len;
 398                v++;
 399                rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
 400                rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 401        }
 402        rqstp->rq_vec[v].iov_len = len;
 403        args->vlen = v + 1;
 404        return 1;
 405}
 406
 407int
 408nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
 409                                        struct nfsd3_createargs *args)
 410{
 411        if (!(p = decode_fh(p, &args->fh))
 412         || !(p = decode_filename(p, &args->name, &args->len)))
 413                return 0;
 414
 415        switch (args->createmode = ntohl(*p++)) {
 416        case NFS3_CREATE_UNCHECKED:
 417        case NFS3_CREATE_GUARDED:
 418                p = decode_sattr3(p, &args->attrs);
 419                break;
 420        case NFS3_CREATE_EXCLUSIVE:
 421                args->verf = p;
 422                p += 2;
 423                break;
 424        default:
 425                return 0;
 426        }
 427
 428        return xdr_argsize_check(rqstp, p);
 429}
 430int
 431nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
 432                                        struct nfsd3_createargs *args)
 433{
 434        if (!(p = decode_fh(p, &args->fh)) ||
 435            !(p = decode_filename(p, &args->name, &args->len)))
 436                return 0;
 437        p = decode_sattr3(p, &args->attrs);
 438
 439        return xdr_argsize_check(rqstp, p);
 440}
 441
 442int
 443nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
 444                                        struct nfsd3_symlinkargs *args)
 445{
 446        unsigned int len, avail;
 447        char *old, *new;
 448        struct kvec *vec;
 449
 450        if (!(p = decode_fh(p, &args->ffh)) ||
 451            !(p = decode_filename(p, &args->fname, &args->flen))
 452                )
 453                return 0;
 454        p = decode_sattr3(p, &args->attrs);
 455
 456        /* now decode the pathname, which might be larger than the first page.
 457         * As we have to check for nul's anyway, we copy it into a new page
 458         * This page appears in the rq_res.pages list, but as pages_len is always
 459         * 0, it won't get in the way
 460         */
 461        len = ntohl(*p++);
 462        if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
 463                return 0;
 464        args->tname = new =
 465                page_address(rqstp->rq_respages[rqstp->rq_resused++]);
 466        args->tlen = len;
 467        /* first copy and check from the first page */
 468        old = (char*)p;
 469        vec = &rqstp->rq_arg.head[0];
 470        avail = vec->iov_len - (old - (char*)vec->iov_base);
 471        while (len && avail && *old) {
 472                *new++ = *old++;
 473                len--;
 474                avail--;
 475        }
 476        /* now copy next page if there is one */
 477        if (len && !avail && rqstp->rq_arg.page_len) {
 478                avail = rqstp->rq_arg.page_len;
 479                if (avail > PAGE_SIZE)
 480                        avail = PAGE_SIZE;
 481                old = page_address(rqstp->rq_arg.pages[0]);
 482        }
 483        while (len && avail && *old) {
 484                *new++ = *old++;
 485                len--;
 486                avail--;
 487        }
 488        *new = '\0';
 489        if (len)
 490                return 0;
 491
 492        return 1;
 493}
 494
 495int
 496nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
 497                                        struct nfsd3_mknodargs *args)
 498{
 499        if (!(p = decode_fh(p, &args->fh))
 500         || !(p = decode_filename(p, &args->name, &args->len)))
 501                return 0;
 502
 503        args->ftype = ntohl(*p++);
 504
 505        if (args->ftype == NF3BLK  || args->ftype == NF3CHR
 506         || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
 507                p = decode_sattr3(p, &args->attrs);
 508
 509        if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
 510                args->major = ntohl(*p++);
 511                args->minor = ntohl(*p++);
 512        }
 513
 514        return xdr_argsize_check(rqstp, p);
 515}
 516
 517int
 518nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
 519                                        struct nfsd3_renameargs *args)
 520{
 521        if (!(p = decode_fh(p, &args->ffh))
 522         || !(p = decode_filename(p, &args->fname, &args->flen))
 523         || !(p = decode_fh(p, &args->tfh))
 524         || !(p = decode_filename(p, &args->tname, &args->tlen)))
 525                return 0;
 526
 527        return xdr_argsize_check(rqstp, p);
 528}
 529
 530int
 531nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
 532                                        struct nfsd3_readlinkargs *args)
 533{
 534        if (!(p = decode_fh(p, &args->fh)))
 535                return 0;
 536        args->buffer =
 537                page_address(rqstp->rq_respages[rqstp->rq_resused++]);
 538
 539        return xdr_argsize_check(rqstp, p);
 540}
 541
 542int
 543nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
 544                                        struct nfsd3_linkargs *args)
 545{
 546        if (!(p = decode_fh(p, &args->ffh))
 547         || !(p = decode_fh(p, &args->tfh))
 548         || !(p = decode_filename(p, &args->tname, &args->tlen)))
 549                return 0;
 550
 551        return xdr_argsize_check(rqstp, p);
 552}
 553
 554int
 555nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
 556                                        struct nfsd3_readdirargs *args)
 557{
 558        if (!(p = decode_fh(p, &args->fh)))
 559                return 0;
 560        p = xdr_decode_hyper(p, &args->cookie);
 561        args->verf   = p; p += 2;
 562        args->dircount = ~0;
 563        args->count  = ntohl(*p++);
 564
 565        if (args->count > PAGE_SIZE)
 566                args->count = PAGE_SIZE;
 567
 568        args->buffer =
 569                page_address(rqstp->rq_respages[rqstp->rq_resused++]);
 570
 571        return xdr_argsize_check(rqstp, p);
 572}
 573
 574int
 575nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
 576                                        struct nfsd3_readdirargs *args)
 577{
 578        int len, pn;
 579        u32 max_blocksize = svc_max_payload(rqstp);
 580
 581        if (!(p = decode_fh(p, &args->fh)))
 582                return 0;
 583        p = xdr_decode_hyper(p, &args->cookie);
 584        args->verf     = p; p += 2;
 585        args->dircount = ntohl(*p++);
 586        args->count    = ntohl(*p++);
 587
 588        len = (args->count > max_blocksize) ? max_blocksize :
 589                                                  args->count;
 590        args->count = len;
 591
 592        while (len > 0) {
 593                pn = rqstp->rq_resused++;
 594                if (!args->buffer)
 595                        args->buffer = page_address(rqstp->rq_respages[pn]);
 596                len -= PAGE_SIZE;
 597        }
 598
 599        return xdr_argsize_check(rqstp, p);
 600}
 601
 602int
 603nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
 604                                        struct nfsd3_commitargs *args)
 605{
 606        if (!(p = decode_fh(p, &args->fh)))
 607                return 0;
 608        p = xdr_decode_hyper(p, &args->offset);
 609        args->count = ntohl(*p++);
 610
 611        return xdr_argsize_check(rqstp, p);
 612}
 613
 614/*
 615 * XDR encode functions
 616 */
 617/*
 618 * There must be an encoding function for void results so svc_process
 619 * will work properly.
 620 */
 621int
 622nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 623{
 624        return xdr_ressize_check(rqstp, p);
 625}
 626
 627/* GETATTR */
 628int
 629nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
 630                                        struct nfsd3_attrstat *resp)
 631{
 632        if (resp->status == 0) {
 633                lease_get_mtime(resp->fh.fh_dentry->d_inode,
 634                                &resp->stat.mtime);
 635                p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
 636        }
 637        return xdr_ressize_check(rqstp, p);
 638}
 639
 640/* SETATTR, REMOVE, RMDIR */
 641int
 642nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
 643                                        struct nfsd3_attrstat *resp)
 644{
 645        p = encode_wcc_data(rqstp, p, &resp->fh);
 646        return xdr_ressize_check(rqstp, p);
 647}
 648
 649/* LOOKUP */
 650int
 651nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
 652                                        struct nfsd3_diropres *resp)
 653{
 654        if (resp->status == 0) {
 655                p = encode_fh(p, &resp->fh);
 656                p = encode_post_op_attr(rqstp, p, &resp->fh);
 657        }
 658        p = encode_post_op_attr(rqstp, p, &resp->dirfh);
 659        return xdr_ressize_check(rqstp, p);
 660}
 661
 662/* ACCESS */
 663int
 664nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
 665                                        struct nfsd3_accessres *resp)
 666{
 667        p = encode_post_op_attr(rqstp, p, &resp->fh);
 668        if (resp->status == 0)
 669                *p++ = htonl(resp->access);
 670        return xdr_ressize_check(rqstp, p);
 671}
 672
 673/* READLINK */
 674int
 675nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
 676                                        struct nfsd3_readlinkres *resp)
 677{
 678        p = encode_post_op_attr(rqstp, p, &resp->fh);
 679        if (resp->status == 0) {
 680                *p++ = htonl(resp->len);
 681                xdr_ressize_check(rqstp, p);
 682                rqstp->rq_res.page_len = resp->len;
 683                if (resp->len & 3) {
 684                        /* need to pad the tail */
 685                        rqstp->rq_res.tail[0].iov_base = p;
 686                        *p = 0;
 687                        rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
 688                }
 689                return 1;
 690        } else
 691                return xdr_ressize_check(rqstp, p);
 692}
 693
 694/* READ */
 695int
 696nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
 697                                        struct nfsd3_readres *resp)
 698{
 699        p = encode_post_op_attr(rqstp, p, &resp->fh);
 700        if (resp->status == 0) {
 701                *p++ = htonl(resp->count);
 702                *p++ = htonl(resp->eof);
 703                *p++ = htonl(resp->count);      /* xdr opaque count */
 704                xdr_ressize_check(rqstp, p);
 705                /* now update rqstp->rq_res to reflect data as well */
 706                rqstp->rq_res.page_len = resp->count;
 707                if (resp->count & 3) {
 708                        /* need to pad the tail */
 709                        rqstp->rq_res.tail[0].iov_base = p;
 710                        *p = 0;
 711                        rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
 712                }
 713                return 1;
 714        } else
 715                return xdr_ressize_check(rqstp, p);
 716}
 717
 718/* WRITE */
 719int
 720nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
 721                                        struct nfsd3_writeres *resp)
 722{
 723        p = encode_wcc_data(rqstp, p, &resp->fh);
 724        if (resp->status == 0) {
 725                *p++ = htonl(resp->count);
 726                *p++ = htonl(resp->committed);
 727                *p++ = htonl(nfssvc_boot.tv_sec);
 728                *p++ = htonl(nfssvc_boot.tv_usec);
 729        }
 730        return xdr_ressize_check(rqstp, p);
 731}
 732
 733/* CREATE, MKDIR, SYMLINK, MKNOD */
 734int
 735nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
 736                                        struct nfsd3_diropres *resp)
 737{
 738        if (resp->status == 0) {
 739                *p++ = xdr_one;
 740                p = encode_fh(p, &resp->fh);
 741                p = encode_post_op_attr(rqstp, p, &resp->fh);
 742        }
 743        p = encode_wcc_data(rqstp, p, &resp->dirfh);
 744        return xdr_ressize_check(rqstp, p);
 745}
 746
 747/* RENAME */
 748int
 749nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
 750                                        struct nfsd3_renameres *resp)
 751{
 752        p = encode_wcc_data(rqstp, p, &resp->ffh);
 753        p = encode_wcc_data(rqstp, p, &resp->tfh);
 754        return xdr_ressize_check(rqstp, p);
 755}
 756
 757/* LINK */
 758int
 759nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
 760                                        struct nfsd3_linkres *resp)
 761{
 762        p = encode_post_op_attr(rqstp, p, &resp->fh);
 763        p = encode_wcc_data(rqstp, p, &resp->tfh);
 764        return xdr_ressize_check(rqstp, p);
 765}
 766
 767/* READDIR */
 768int
 769nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
 770                                        struct nfsd3_readdirres *resp)
 771{
 772        p = encode_post_op_attr(rqstp, p, &resp->fh);
 773
 774        if (resp->status == 0) {
 775                /* stupid readdir cookie */
 776                memcpy(p, resp->verf, 8); p += 2;
 777                xdr_ressize_check(rqstp, p);
 778                if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
 779                        return 1; /*No room for trailer */
 780                rqstp->rq_res.page_len = (resp->count) << 2;
 781
 782                /* add the 'tail' to the end of the 'head' page - page 0. */
 783                rqstp->rq_res.tail[0].iov_base = p;
 784                *p++ = 0;               /* no more entries */
 785                *p++ = htonl(resp->common.err == nfserr_eof);
 786                rqstp->rq_res.tail[0].iov_len = 2<<2;
 787                return 1;
 788        } else
 789                return xdr_ressize_check(rqstp, p);
 790}
 791
 792static __be32 *
 793encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
 794             int namlen, u64 ino)
 795{
 796        *p++ = xdr_one;                          /* mark entry present */
 797        p    = xdr_encode_hyper(p, ino);         /* file id */
 798        p    = xdr_encode_array(p, name, namlen);/* name length & name */
 799
 800        cd->offset = p;                         /* remember pointer */
 801        p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
 802
 803        return p;
 804}
 805
 806static __be32
 807compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
 808                const char *name, int namlen)
 809{
 810        struct svc_export       *exp;
 811        struct dentry           *dparent, *dchild;
 812        __be32 rv = nfserr_noent;
 813
 814        dparent = cd->fh.fh_dentry;
 815        exp  = cd->fh.fh_export;
 816
 817        if (isdotent(name, namlen)) {
 818                if (namlen == 2) {
 819                        dchild = dget_parent(dparent);
 820                        /* filesystem root - cannot return filehandle for ".." */
 821                        if (dchild == dparent)
 822                                goto out;
 823                } else
 824                        dchild = dget(dparent);
 825        } else
 826                dchild = lookup_one_len(name, dparent, namlen);
 827        if (IS_ERR(dchild))
 828                return rv;
 829        if (d_mountpoint(dchild))
 830                goto out;
 831        if (!dchild->d_inode)
 832                goto out;
 833        rv = fh_compose(fhp, exp, dchild, &cd->fh);
 834out:
 835        dput(dchild);
 836        return rv;
 837}
 838
 839static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen)
 840{
 841        struct svc_fh   fh;
 842        __be32 err;
 843
 844        fh_init(&fh, NFS3_FHSIZE);
 845        err = compose_entry_fh(cd, &fh, name, namlen);
 846        if (err) {
 847                *p++ = 0;
 848                *p++ = 0;
 849                goto out;
 850        }
 851        p = encode_post_op_attr(cd->rqstp, p, &fh);
 852        *p++ = xdr_one;                 /* yes, a file handle follows */
 853        p = encode_fh(p, &fh);
 854out:
 855        fh_put(&fh);
 856        return p;
 857}
 858
 859/*
 860 * Encode a directory entry. This one works for both normal readdir
 861 * and readdirplus.
 862 * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
 863 * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
 864 * 
 865 * The readdirplus baggage is 1+21 words for post_op_attr, plus the
 866 * file handle.
 867 */
 868
 869#define NFS3_ENTRY_BAGGAGE      (2 + 1 + 2 + 1)
 870#define NFS3_ENTRYPLUS_BAGGAGE  (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
 871static int
 872encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
 873             loff_t offset, u64 ino, unsigned int d_type, int plus)
 874{
 875        struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
 876                                                        common);
 877        __be32          *p = cd->buffer;
 878        caddr_t         curr_page_addr = NULL;
 879        int             pn;             /* current page number */
 880        int             slen;           /* string (name) length */
 881        int             elen;           /* estimated entry length in words */
 882        int             num_entry_words = 0;    /* actual number of words */
 883
 884        if (cd->offset) {
 885                u64 offset64 = offset;
 886
 887                if (unlikely(cd->offset1)) {
 888                        /* we ended up with offset on a page boundary */
 889                        *cd->offset = htonl(offset64 >> 32);
 890                        *cd->offset1 = htonl(offset64 & 0xffffffff);
 891                        cd->offset1 = NULL;
 892                } else {
 893                        xdr_encode_hyper(cd->offset, offset64);
 894                }
 895        }
 896
 897        /*
 898        dprintk("encode_entry(%.*s @%ld%s)\n",
 899                namlen, name, (long) offset, plus? " plus" : "");
 900         */
 901
 902        /* truncate filename if too long */
 903        if (namlen > NFS3_MAXNAMLEN)
 904                namlen = NFS3_MAXNAMLEN;
 905
 906        slen = XDR_QUADLEN(namlen);
 907        elen = slen + NFS3_ENTRY_BAGGAGE
 908                + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
 909
 910        if (cd->buflen < elen) {
 911                cd->common.err = nfserr_toosmall;
 912                return -EINVAL;
 913        }
 914
 915        /* determine which page in rq_respages[] we are currently filling */
 916        for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
 917                curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
 918
 919                if (((caddr_t)cd->buffer >= curr_page_addr) &&
 920                    ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
 921                        break;
 922        }
 923
 924        if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
 925                /* encode entry in current page */
 926
 927                p = encode_entry_baggage(cd, p, name, namlen, ino);
 928
 929                if (plus)
 930                        p = encode_entryplus_baggage(cd, p, name, namlen);
 931                num_entry_words = p - cd->buffer;
 932        } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
 933                /* temporarily encode entry into next page, then move back to
 934                 * current and next page in rq_respages[] */
 935                __be32 *p1, *tmp;
 936                int len1, len2;
 937
 938                /* grab next page for temporary storage of entry */
 939                p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
 940
 941                p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
 942
 943                if (plus)
 944                        p1 = encode_entryplus_baggage(cd, p1, name, namlen);
 945
 946                /* determine entry word length and lengths to go in pages */
 947                num_entry_words = p1 - tmp;
 948                len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
 949                if ((num_entry_words << 2) < len1) {
 950                        /* the actual number of words in the entry is less
 951                         * than elen and can still fit in the current page
 952                         */
 953                        memmove(p, tmp, num_entry_words << 2);
 954                        p += num_entry_words;
 955
 956                        /* update offset */
 957                        cd->offset = cd->buffer + (cd->offset - tmp);
 958                } else {
 959                        unsigned int offset_r = (cd->offset - tmp) << 2;
 960
 961                        /* update pointer to offset location.
 962                         * This is a 64bit quantity, so we need to
 963                         * deal with 3 cases:
 964                         *  -   entirely in first page
 965                         *  -   entirely in second page
 966                         *  -   4 bytes in each page
 967                         */
 968                        if (offset_r + 8 <= len1) {
 969                                cd->offset = p + (cd->offset - tmp);
 970                        } else if (offset_r >= len1) {
 971                                cd->offset -= len1 >> 2;
 972                        } else {
 973                                /* sitting on the fence */
 974                                BUG_ON(offset_r != len1 - 4);
 975                                cd->offset = p + (cd->offset - tmp);
 976                                cd->offset1 = tmp;
 977                        }
 978
 979                        len2 = (num_entry_words << 2) - len1;
 980
 981                        /* move from temp page to current and next pages */
 982                        memmove(p, tmp, len1);
 983                        memmove(tmp, (caddr_t)tmp+len1, len2);
 984
 985                        p = tmp + (len2 >> 2);
 986                }
 987        }
 988        else {
 989                cd->common.err = nfserr_toosmall;
 990                return -EINVAL;
 991        }
 992
 993        cd->buflen -= num_entry_words;
 994        cd->buffer = p;
 995        cd->common.err = nfs_ok;
 996        return 0;
 997
 998}
 999
1000int
1001nfs3svc_encode_entry(void *cd, const char *name,
1002                     int namlen, loff_t offset, u64 ino, unsigned int d_type)
1003{
1004        return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1005}
1006
1007int
1008nfs3svc_encode_entry_plus(void *cd, const char *name,
1009                          int namlen, loff_t offset, u64 ino,
1010                          unsigned int d_type)
1011{
1012        return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1013}
1014
1015/* FSSTAT */
1016int
1017nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1018                                        struct nfsd3_fsstatres *resp)
1019{
1020        struct kstatfs  *s = &resp->stats;
1021        u64             bs = s->f_bsize;
1022
1023        *p++ = xdr_zero;        /* no post_op_attr */
1024
1025        if (resp->status == 0) {
1026                p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
1027                p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
1028                p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
1029                p = xdr_encode_hyper(p, s->f_files);    /* total inodes */
1030                p = xdr_encode_hyper(p, s->f_ffree);    /* free inodes */
1031                p = xdr_encode_hyper(p, s->f_ffree);    /* user available inodes */
1032                *p++ = htonl(resp->invarsec);   /* mean unchanged time */
1033        }
1034        return xdr_ressize_check(rqstp, p);
1035}
1036
1037/* FSINFO */
1038int
1039nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1040                                        struct nfsd3_fsinfores *resp)
1041{
1042        *p++ = xdr_zero;        /* no post_op_attr */
1043
1044        if (resp->status == 0) {
1045                *p++ = htonl(resp->f_rtmax);
1046                *p++ = htonl(resp->f_rtpref);
1047                *p++ = htonl(resp->f_rtmult);
1048                *p++ = htonl(resp->f_wtmax);
1049                *p++ = htonl(resp->f_wtpref);
1050                *p++ = htonl(resp->f_wtmult);
1051                *p++ = htonl(resp->f_dtpref);
1052                p = xdr_encode_hyper(p, resp->f_maxfilesize);
1053                *p++ = xdr_one;
1054                *p++ = xdr_zero;
1055                *p++ = htonl(resp->f_properties);
1056        }
1057
1058        return xdr_ressize_check(rqstp, p);
1059}
1060
1061/* PATHCONF */
1062int
1063nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1064                                        struct nfsd3_pathconfres *resp)
1065{
1066        *p++ = xdr_zero;        /* no post_op_attr */
1067
1068        if (resp->status == 0) {
1069                *p++ = htonl(resp->p_link_max);
1070                *p++ = htonl(resp->p_name_max);
1071                *p++ = htonl(resp->p_no_trunc);
1072                *p++ = htonl(resp->p_chown_restricted);
1073                *p++ = htonl(resp->p_case_insensitive);
1074                *p++ = htonl(resp->p_case_preserving);
1075        }
1076
1077        return xdr_ressize_check(rqstp, p);
1078}
1079
1080/* COMMIT */
1081int
1082nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1083                                        struct nfsd3_commitres *resp)
1084{
1085        p = encode_wcc_data(rqstp, p, &resp->fh);
1086        /* Write verifier */
1087        if (resp->status == 0) {
1088                *p++ = htonl(nfssvc_boot.tv_sec);
1089                *p++ = htonl(nfssvc_boot.tv_usec);
1090        }
1091        return xdr_ressize_check(rqstp, p);
1092}
1093
1094/*
1095 * XDR release functions
1096 */
1097int
1098nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1099                                        struct nfsd3_attrstat *resp)
1100{
1101        fh_put(&resp->fh);
1102        return 1;
1103}
1104
1105int
1106nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1107                                        struct nfsd3_fhandle_pair *resp)
1108{
1109        fh_put(&resp->fh1);
1110        fh_put(&resp->fh2);
1111        return 1;
1112}
1113
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