fs/nfsd/nfs3xdr.c

   1 /*
   2  * linux/fs/nfsd/nfs3xdr.c
   3  *
   4  * XDR support for nfsd/protocol version 3.
   5  *
   6  * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de>
   7  *
   8  * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()!
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/time.h>
  13 #include <linux/nfs3.h>
  14 #include <linux/list.h>
  15 #include <linux/spinlock.h>
  16 #include <linux/dcache.h>
  17 #include <linux/namei.h>
  18 #include <linux/mm.h>
  19 #include <linux/vfs.h>
  20 #include <linux/sunrpc/xdr.h>
  21 #include <linux/sunrpc/svc.h>
  22 #include <linux/nfsd/nfsd.h>
  23 #include <linux/nfsd/xdr3.h>
  24 #include "auth.h"
  25
  26 #define NFSDDBG_FACILITY                NFSDDBG_XDR
  27
  28
  29 /*
  30  * Mapping of S_IF* types to NFS file types
  31  */
  32 static u32      nfs3_ftypes[] = {
  33         NF3NON,  NF3FIFO, NF3CHR, NF3BAD,
  34         NF3DIR,  NF3BAD,  NF3BLK, NF3BAD,
  35         NF3REG,  NF3BAD,  NF3LNK, NF3BAD,
  36         NF3SOCK, NF3BAD,  NF3LNK, NF3BAD,
  37 };
  38
  39 /*
  40  * XDR functions for basic NFS types
  41  */
  42 static __be32 *
  43 encode_time3(__be32 *p, struct timespec *time)
  44 {
  45         *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
  46         return p;
  47 }
  48
  49 static __be32 *
  50 decode_time3(__be32 *p, struct timespec *time)
  51 {
  52         time->tv_sec = ntohl(*p++);
  53         time->tv_nsec = ntohl(*p++);
  54         return p;
  55 }
  56
  57 static __be32 *
  58 decode_fh(__be32 *p, struct svc_fh *fhp)
  59 {
  60         unsigned int size;
  61         fh_init(fhp, NFS3_FHSIZE);
  62         size = ntohl(*p++);
  63         if (size > NFS3_FHSIZE)
  64                 return NULL;
  65
  66         memcpy(&fhp->fh_handle.fh_base, p, size);
  67         fhp->fh_handle.fh_size = size;
  68         return p + XDR_QUADLEN(size);
  69 }
  70
  71 /* Helper function for NFSv3 ACL code */
  72 __be32 *nfs3svc_decode_fh(__be32 *p, struct svc_fh *fhp)
  73 {
  74         return decode_fh(p, fhp);
  75 }
  76
  77 static __be32 *
  78 encode_fh(__be32 *p, struct svc_fh *fhp)
  79 {
  80         unsigned int size = fhp->fh_handle.fh_size;
  81         *p++ = htonl(size);
  82         if (size) p[XDR_QUADLEN(size)-1]=0;
  83         memcpy(p, &fhp->fh_handle.fh_base, size);
  84         return p + XDR_QUADLEN(size);
  85 }
  86
  87 /*
  88  * Decode a file name and make sure that the path contains
  89  * no slashes or null bytes.
  90  */
  91 static __be32 *
  92 decode_filename(__be32 *p, char **namp, unsigned int *lenp)
  93 {
  94         char            *name;
  95         unsigned int    i;
  96
  97         if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) {
  98                 for (i = 0, name = *namp; i < *lenp; i++, name++) {
  99                         if (*name == '\0' || *name == '/')
 100                                 return NULL;
 101                 }
 102         }
 103
 104         return p;
 105 }
 106
 107 static __be32 *
 108 decode_sattr3(__be32 *p, struct iattr *iap)
 109 {
 110         u32     tmp;
 111
 112         iap->ia_valid = 0;
 113
 114         if (*p++) {
 115                 iap->ia_valid |= ATTR_MODE;
 116                 iap->ia_mode = ntohl(*p++);
 117         }
 118         if (*p++) {
 119                 iap->ia_valid |= ATTR_UID;
 120                 iap->ia_uid = ntohl(*p++);
 121         }
 122         if (*p++) {
 123                 iap->ia_valid |= ATTR_GID;
 124                 iap->ia_gid = ntohl(*p++);
 125         }
 126         if (*p++) {
 127                 u64     newsize;
 128
 129                 iap->ia_valid |= ATTR_SIZE;
 130                 p = xdr_decode_hyper(p, &newsize);
 131                 if (newsize <= NFS_OFFSET_MAX)
 132                         iap->ia_size = newsize;
 133                 else
 134                         iap->ia_size = NFS_OFFSET_MAX;
 135         }
 136         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 137                 iap->ia_valid |= ATTR_ATIME;
 138         } else if (tmp == 2) {          /* set to client time */
 139                 iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
 140                 iap->ia_atime.tv_sec = ntohl(*p++);
 141                 iap->ia_atime.tv_nsec = ntohl(*p++);
 142         }
 143         if ((tmp = ntohl(*p++)) == 1) { /* set to server time */
 144                 iap->ia_valid |= ATTR_MTIME;
 145         } else if (tmp == 2) {          /* set to client time */
 146                 iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
 147                 iap->ia_mtime.tv_sec = ntohl(*p++);
 148                 iap->ia_mtime.tv_nsec = ntohl(*p++);
 149         }
 150         return p;
 151 }
 152
 153 static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp)
 154 {
 155         u64 f;
 156         switch(fsid_source(fhp)) {
 157         default:
 158         case FSIDSOURCE_DEV:
 159                 p = xdr_encode_hyper(p, (u64)huge_encode_dev
 160                                      (fhp->fh_dentry->d_inode->i_sb->s_dev));
 161                 break;
 162         case FSIDSOURCE_FSID:
 163                 p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid);
 164                 break;
 165         case FSIDSOURCE_UUID:
 166                 f = ((u64*)fhp->fh_export->ex_uuid)[0];
 167                 f ^= ((u64*)fhp->fh_export->ex_uuid)[1];
 168                 p = xdr_encode_hyper(p, f);
 169                 break;
 170         }
 171         return p;
 172 }
 173
 174 static __be32 *
 175 encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
 176               struct kstat *stat)
 177 {
 178         *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]);
 179         *p++ = htonl((u32) stat->mode);
 180         *p++ = htonl((u32) stat->nlink);
 181         *p++ = htonl((u32) nfsd_ruid(rqstp, stat->uid));
 182         *p++ = htonl((u32) nfsd_rgid(rqstp, stat->gid));
 183         if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) {
 184                 p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN);
 185         } else {
 186                 p = xdr_encode_hyper(p, (u64) stat->size);
 187         }
 188         p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9);
 189         *p++ = htonl((u32) MAJOR(stat->rdev));
 190         *p++ = htonl((u32) MINOR(stat->rdev));
 191         p = encode_fsid(p, fhp);
 192         p = xdr_encode_hyper(p, stat->ino);
 193         p = encode_time3(p, &stat->atime);
 194         p = encode_time3(p, &stat->mtime);
 195         p = encode_time3(p, &stat->ctime);
 196
 197         return p;
 198 }
 199
 200 static __be32 *
 201 encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 202 {
 203         /* Attributes to follow */
 204         *p++ = xdr_one;
 205         return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr);
 206 }
 207
 208 /*
 209  * Encode post-operation attributes.
 210  * The inode may be NULL if the call failed because of a stale file
 211  * handle. In this case, no attributes are returned.
 212  */
 213 static __be32 *
 214 encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 215 {
 216         struct dentry *dentry = fhp->fh_dentry;
 217         if (dentry && dentry->d_inode) {
 218                 int err;
 219                 struct kstat stat;
 220
 221                 err = vfs_getattr(fhp->fh_export->ex_path.mnt, dentry, &stat);
 222                 if (!err) {
 223                         *p++ = xdr_one;         /* attributes follow */
 224                         lease_get_mtime(dentry->d_inode, &stat.mtime);
 225                         return encode_fattr3(rqstp, p, fhp, &stat);
 226                 }
 227         }
 228         *p++ = xdr_zero;
 229         return p;
 230 }
 231
 232 /* Helper for NFSv3 ACLs */
 233 __be32 *
 234 nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 235 {
 236         return encode_post_op_attr(rqstp, p, fhp);
 237 }
 238
 239 /*
 240  * Enocde weak cache consistency data
 241  */
 242 static __be32 *
 243 encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp)
 244 {
 245         struct dentry   *dentry = fhp->fh_dentry;
 246
 247         if (dentry && dentry->d_inode && fhp->fh_post_saved) {
 248                 if (fhp->fh_pre_saved) {
 249                         *p++ = xdr_one;
 250                         p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size);
 251                         p = encode_time3(p, &fhp->fh_pre_mtime);
 252                         p = encode_time3(p, &fhp->fh_pre_ctime);
 253                 } else {
 254                         *p++ = xdr_zero;
 255                 }
 256                 return encode_saved_post_attr(rqstp, p, fhp);
 257         }
 258         /* no pre- or post-attrs */
 259         *p++ = xdr_zero;
 260         return encode_post_op_attr(rqstp, p, fhp);
 261 }
 262
 263 /*
 264  * Fill in the post_op attr for the wcc data
 265  */
 266 void fill_post_wcc(struct svc_fh *fhp)
 267 {
 268         int err;
 269
 270         if (fhp->fh_post_saved)
 271                 printk("nfsd: inode locked twice during operation.\n");
 272
 273         err = vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dentry,
 274                         &fhp->fh_post_attr);
 275         fhp->fh_post_change = fhp->fh_dentry->d_inode->i_version;
 276         if (err)
 277                 fhp->fh_post_saved = 0;
 278         else
 279                 fhp->fh_post_saved = 1;
 280 }
 281
 282 /*
 283  * XDR decode functions
 284  */
 285 int
 286 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
 287 {
 288         if (!(p = decode_fh(p, &args->fh)))
 289                 return 0;
 290         return xdr_argsize_check(rqstp, p);
 291 }
 292
 293 int
 294 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
 295                                         struct nfsd3_sattrargs *args)
 296 {
 297         if (!(p = decode_fh(p, &args->fh)))
 298                 return 0;
 299         p = decode_sattr3(p, &args->attrs);
 300
 301         if ((args->check_guard = ntohl(*p++)) != 0) {
 302                 struct timespec time;
 303                 p = decode_time3(p, &time);
 304                 args->guardtime = time.tv_sec;
 305         }
 306
 307         return xdr_argsize_check(rqstp, p);
 308 }
 309
 310 int
 311 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
 312                                         struct nfsd3_diropargs *args)
 313 {
 314         if (!(p = decode_fh(p, &args->fh))
 315          || !(p = decode_filename(p, &args->name, &args->len)))
 316                 return 0;
 317
 318         return xdr_argsize_check(rqstp, p);
 319 }
 320
 321 int
 322 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
 323                                         struct nfsd3_accessargs *args)
 324 {
 325         if (!(p = decode_fh(p, &args->fh)))
 326                 return 0;
 327         args->access = ntohl(*p++);
 328
 329         return xdr_argsize_check(rqstp, p);
 330 }
 331
 332 int
 333 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
 334                                         struct nfsd3_readargs *args)
 335 {
 336         unsigned int len;
 337         int v,pn;
 338         u32 max_blocksize = svc_max_payload(rqstp);
 339
 340         if (!(p = decode_fh(p, &args->fh)))
 341                 return 0;
 342         p = xdr_decode_hyper(p, &args->offset);
 343
 344         len = args->count = ntohl(*p++);
 345
 346         if (len > max_blocksize)
 347                 len = max_blocksize;
 348
 349         /* set up the kvec */
 350         v=0;
 351         while (len > 0) {
 352                 pn = rqstp->rq_resused++;
 353                 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
 354                 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
 355                 len -= rqstp->rq_vec[v].iov_len;
 356                 v++;
 357         }
 358         args->vlen = v;
 359         return xdr_argsize_check(rqstp, p);
 360 }
 361
 362 int
 363 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
 364                                         struct nfsd3_writeargs *args)
 365 {
 366         unsigned int len, v, hdr, dlen;
 367         u32 max_blocksize = svc_max_payload(rqstp);
 368
 369         if (!(p = decode_fh(p, &args->fh)))
 370                 return 0;
 371         p = xdr_decode_hyper(p, &args->offset);
 372
 373         args->count = ntohl(*p++);
 374         args->stable = ntohl(*p++);
 375         len = args->len = ntohl(*p++);
 376         /*
 377          * The count must equal the amount of data passed.
 378          */
 379         if (args->count != args->len)
 380                 return 0;
 381
 382         /*
 383          * Check to make sure that we got the right number of
 384          * bytes.
 385          */
 386         hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
 387         dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
 388                 - hdr;
 389         /*
 390          * Round the length of the data which was specified up to
 391          * the next multiple of XDR units and then compare that
 392          * against the length which was actually received.
 393          * Note that when RPCSEC/GSS (for example) is used, the
 394          * data buffer can be padded so dlen might be larger
 395          * than required.  It must never be smaller.
 396          */
 397         if (dlen < XDR_QUADLEN(len)*4)
 398                 return 0;
 399
 400         if (args->count > max_blocksize) {
 401                 args->count = max_blocksize;
 402                 len = args->len = max_blocksize;
 403         }
 404         rqstp->rq_vec[0].iov_base = (void*)p;
 405         rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
 406         v = 0;
 407         while (len > rqstp->rq_vec[v].iov_len) {
 408                 len -= rqstp->rq_vec[v].iov_len;
 409                 v++;
 410                 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
 411                 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 412         }
 413         rqstp->rq_vec[v].iov_len = len;
 414         args->vlen = v + 1;
 415         return 1;
 416 }
 417
 418 int
 419 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
 420                                         struct nfsd3_createargs *args)
 421 {
 422         if (!(p = decode_fh(p, &args->fh))
 423          || !(p = decode_filename(p, &args->name, &args->len)))
 424                 return 0;
 425
 426         switch (args->createmode = ntohl(*p++)) {
 427         case NFS3_CREATE_UNCHECKED:
 428         case NFS3_CREATE_GUARDED:
 429                 p = decode_sattr3(p, &args->attrs);
 430                 break;
 431         case NFS3_CREATE_EXCLUSIVE:
 432                 args->verf = p;
 433                 p += 2;
 434                 break;
 435         default:
 436                 return 0;
 437         }
 438
 439         return xdr_argsize_check(rqstp, p);
 440 }
 441 int
 442 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
 443                                         struct nfsd3_createargs *args)
 444 {
 445         if (!(p = decode_fh(p, &args->fh)) ||
 446             !(p = decode_filename(p, &args->name, &args->len)))
 447                 return 0;
 448         p = decode_sattr3(p, &args->attrs);
 449
 450         return xdr_argsize_check(rqstp, p);
 451 }
 452
 453 int
 454 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
 455                                         struct nfsd3_symlinkargs *args)
 456 {
 457         unsigned int len, avail;
 458         char *old, *new;
 459         struct kvec *vec;
 460
 461         if (!(p = decode_fh(p, &args->ffh)) ||
 462             !(p = decode_filename(p, &args->fname, &args->flen))
 463                 )
 464                 return 0;
 465         p = decode_sattr3(p, &args->attrs);
 466
 467         /* now decode the pathname, which might be larger than the first page.
 468          * As we have to check for nul's anyway, we copy it into a new page
 469          * This page appears in the rq_res.pages list, but as pages_len is always
 470          * 0, it won't get in the way
 471          */
 472         len = ntohl(*p++);
 473         if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
 474                 return 0;
 475         args->tname = new =
 476                 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
 477         args->tlen = len;
 478         /* first copy and check from the first page */
 479         old = (char*)p;
 480         vec = &rqstp->rq_arg.head[0];
 481         avail = vec->iov_len - (old - (char*)vec->iov_base);
 482         while (len && avail && *old) {
 483                 *new++ = *old++;
 484                 len--;
 485                 avail--;
 486         }
 487         /* now copy next page if there is one */
 488         if (len && !avail && rqstp->rq_arg.page_len) {
 489                 avail = rqstp->rq_arg.page_len;
 490                 if (avail > PAGE_SIZE)
 491                         avail = PAGE_SIZE;
 492                 old = page_address(rqstp->rq_arg.pages[0]);
 493         }
 494         while (len && avail && *old) {
 495                 *new++ = *old++;
 496                 len--;
 497                 avail--;
 498         }
 499         *new = '\0';
 500         if (len)
 501                 return 0;
 502
 503         return 1;
 504 }
 505
 506 int
 507 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
 508                                         struct nfsd3_mknodargs *args)
 509 {
 510         if (!(p = decode_fh(p, &args->fh))
 511          || !(p = decode_filename(p, &args->name, &args->len)))
 512                 return 0;
 513
 514         args->ftype = ntohl(*p++);
 515
 516         if (args->ftype == NF3BLK  || args->ftype == NF3CHR
 517          || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
 518                 p = decode_sattr3(p, &args->attrs);
 519
 520         if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
 521                 args->major = ntohl(*p++);
 522                 args->minor = ntohl(*p++);
 523         }
 524
 525         return xdr_argsize_check(rqstp, p);
 526 }
 527
 528 int
 529 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
 530                                         struct nfsd3_renameargs *args)
 531 {
 532         if (!(p = decode_fh(p, &args->ffh))
 533          || !(p = decode_filename(p, &args->fname, &args->flen))
 534          || !(p = decode_fh(p, &args->tfh))
 535          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 536                 return 0;
 537
 538         return xdr_argsize_check(rqstp, p);
 539 }
 540
 541 int
 542 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
 543                                         struct nfsd3_readlinkargs *args)
 544 {
 545         if (!(p = decode_fh(p, &args->fh)))
 546                 return 0;
 547         args->buffer =
 548                 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
 549
 550         return xdr_argsize_check(rqstp, p);
 551 }
 552
 553 int
 554 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
 555                                         struct nfsd3_linkargs *args)
 556 {
 557         if (!(p = decode_fh(p, &args->ffh))
 558          || !(p = decode_fh(p, &args->tfh))
 559          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 560                 return 0;
 561
 562         return xdr_argsize_check(rqstp, p);
 563 }
 564
 565 int
 566 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
 567                                         struct nfsd3_readdirargs *args)
 568 {
 569         if (!(p = decode_fh(p, &args->fh)))
 570                 return 0;
 571         p = xdr_decode_hyper(p, &args->cookie);
 572         args->verf   = p; p += 2;
 573         args->dircount = ~0;
 574         args->count  = ntohl(*p++);
 575
 576         if (args->count > PAGE_SIZE)
 577                 args->count = PAGE_SIZE;
 578
 579         args->buffer =
 580                 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
 581
 582         return xdr_argsize_check(rqstp, p);
 583 }
 584
 585 int
 586 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
 587                                         struct nfsd3_readdirargs *args)
 588 {
 589         int len, pn;
 590         u32 max_blocksize = svc_max_payload(rqstp);
 591
 592         if (!(p = decode_fh(p, &args->fh)))
 593                 return 0;
 594         p = xdr_decode_hyper(p, &args->cookie);
 595         args->verf     = p; p += 2;
 596         args->dircount = ntohl(*p++);
 597         args->count    = ntohl(*p++);
 598
 599         len = (args->count > max_blocksize) ? max_blocksize :
 600                                                   args->count;
 601         args->count = len;
 602
 603         while (len > 0) {
 604                 pn = rqstp->rq_resused++;
 605                 if (!args->buffer)
 606                         args->buffer = page_address(rqstp->rq_respages[pn]);
 607                 len -= PAGE_SIZE;
 608         }
 609
 610         return xdr_argsize_check(rqstp, p);
 611 }
 612
 613 int
 614 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
 615                                         struct nfsd3_commitargs *args)
 616 {
 617         if (!(p = decode_fh(p, &args->fh)))
 618                 return 0;
 619         p = xdr_decode_hyper(p, &args->offset);
 620         args->count = ntohl(*p++);
 621
 622         return xdr_argsize_check(rqstp, p);
 623 }
 624
 625 /*
 626  * XDR encode functions
 627  */
 628 /*
 629  * There must be an encoding function for void results so svc_process
 630  * will work properly.
 631  */
 632 int
 633 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 634 {
 635         return xdr_ressize_check(rqstp, p);
 636 }
 637
 638 /* GETATTR */
 639 int
 640 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
 641                                         struct nfsd3_attrstat *resp)
 642 {
 643         if (resp->status == 0) {
 644                 lease_get_mtime(resp->fh.fh_dentry->d_inode,
 645                                 &resp->stat.mtime);
 646                 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
 647         }
 648         return xdr_ressize_check(rqstp, p);
 649 }
 650
 651 /* SETATTR, REMOVE, RMDIR */
 652 int
 653 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
 654                                         struct nfsd3_attrstat *resp)
 655 {
 656         p = encode_wcc_data(rqstp, p, &resp->fh);
 657         return xdr_ressize_check(rqstp, p);
 658 }
 659
 660 /* LOOKUP */
 661 int
 662 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
 663                                         struct nfsd3_diropres *resp)
 664 {
 665         if (resp->status == 0) {
 666                 p = encode_fh(p, &resp->fh);
 667                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 668         }
 669         p = encode_post_op_attr(rqstp, p, &resp->dirfh);
 670         return xdr_ressize_check(rqstp, p);
 671 }
 672
 673 /* ACCESS */
 674 int
 675 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
 676                                         struct nfsd3_accessres *resp)
 677 {
 678         p = encode_post_op_attr(rqstp, p, &resp->fh);
 679         if (resp->status == 0)
 680                 *p++ = htonl(resp->access);
 681         return xdr_ressize_check(rqstp, p);
 682 }
 683
 684 /* READLINK */
 685 int
 686 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
 687                                         struct nfsd3_readlinkres *resp)
 688 {
 689         p = encode_post_op_attr(rqstp, p, &resp->fh);
 690         if (resp->status == 0) {
 691                 *p++ = htonl(resp->len);
 692                 xdr_ressize_check(rqstp, p);
 693                 rqstp->rq_res.page_len = resp->len;
 694                 if (resp->len & 3) {
 695                         /* need to pad the tail */
 696                         rqstp->rq_res.tail[0].iov_base = p;
 697                         *p = 0;
 698                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
 699                 }
 700                 return 1;
 701         } else
 702                 return xdr_ressize_check(rqstp, p);
 703 }
 704
 705 /* READ */
 706 int
 707 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
 708                                         struct nfsd3_readres *resp)
 709 {
 710         p = encode_post_op_attr(rqstp, p, &resp->fh);
 711         if (resp->status == 0) {
 712                 *p++ = htonl(resp->count);
 713                 *p++ = htonl(resp->eof);
 714                 *p++ = htonl(resp->count);      /* xdr opaque count */
 715                 xdr_ressize_check(rqstp, p);
 716                 /* now update rqstp->rq_res to reflect data aswell */
 717                 rqstp->rq_res.page_len = resp->count;
 718                 if (resp->count & 3) {
 719                         /* need to pad the tail */
 720                         rqstp->rq_res.tail[0].iov_base = p;
 721                         *p = 0;
 722                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
 723                 }
 724                 return 1;
 725         } else
 726                 return xdr_ressize_check(rqstp, p);
 727 }
 728
 729 /* WRITE */
 730 int
 731 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
 732                                         struct nfsd3_writeres *resp)
 733 {
 734         p = encode_wcc_data(rqstp, p, &resp->fh);
 735         if (resp->status == 0) {
 736                 *p++ = htonl(resp->count);
 737                 *p++ = htonl(resp->committed);
 738                 *p++ = htonl(nfssvc_boot.tv_sec);
 739                 *p++ = htonl(nfssvc_boot.tv_usec);
 740         }
 741         return xdr_ressize_check(rqstp, p);
 742 }
 743
 744 /* CREATE, MKDIR, SYMLINK, MKNOD */
 745 int
 746 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
 747                                         struct nfsd3_diropres *resp)
 748 {
 749         if (resp->status == 0) {
 750                 *p++ = xdr_one;
 751                 p = encode_fh(p, &resp->fh);
 752                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 753         }
 754         p = encode_wcc_data(rqstp, p, &resp->dirfh);
 755         return xdr_ressize_check(rqstp, p);
 756 }
 757
 758 /* RENAME */
 759 int
 760 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
 761                                         struct nfsd3_renameres *resp)
 762 {
 763         p = encode_wcc_data(rqstp, p, &resp->ffh);
 764         p = encode_wcc_data(rqstp, p, &resp->tfh);
 765         return xdr_ressize_check(rqstp, p);
 766 }
 767
 768 /* LINK */
 769 int
 770 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
 771                                         struct nfsd3_linkres *resp)
 772 {
 773         p = encode_post_op_attr(rqstp, p, &resp->fh);
 774         p = encode_wcc_data(rqstp, p, &resp->tfh);
 775         return xdr_ressize_check(rqstp, p);
 776 }
 777
 778 /* READDIR */
 779 int
 780 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
 781                                         struct nfsd3_readdirres *resp)
 782 {
 783         p = encode_post_op_attr(rqstp, p, &resp->fh);
 784
 785         if (resp->status == 0) {
 786                 /* stupid readdir cookie */
 787                 memcpy(p, resp->verf, 8); p += 2;
 788                 xdr_ressize_check(rqstp, p);
 789                 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
 790                         return 1; /*No room for trailer */
 791                 rqstp->rq_res.page_len = (resp->count) << 2;
 792
 793                 /* add the 'tail' to the end of the 'head' page - page 0. */
 794                 rqstp->rq_res.tail[0].iov_base = p;
 795                 *p++ = 0;               /* no more entries */
 796                 *p++ = htonl(resp->common.err == nfserr_eof);
 797                 rqstp->rq_res.tail[0].iov_len = 2<<2;
 798                 return 1;
 799         } else
 800                 return xdr_ressize_check(rqstp, p);
 801 }
 802
 803 static __be32 *
 804 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
 805              int namlen, u64 ino)
 806 {
 807         *p++ = xdr_one;                          /* mark entry present */
 808         p    = xdr_encode_hyper(p, ino);         /* file id */
 809         p    = xdr_encode_array(p, name, namlen);/* name length & name */
 810
 811         cd->offset = p;                         /* remember pointer */
 812         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
 813
 814         return p;
 815 }
 816
 817 static int
 818 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
 819                 const char *name, int namlen)
 820 {
 821         struct svc_export       *exp;
 822         struct dentry           *dparent, *dchild;
 823         int rv = 0;
 824
 825         dparent = cd->fh.fh_dentry;
 826         exp  = cd->fh.fh_export;
 827
 828         if (isdotent(name, namlen)) {
 829                 if (namlen == 2) {
 830                         dchild = dget_parent(dparent);
 831                         if (dchild == dparent) {
 832                                 /* filesystem root - cannot return filehandle for ".." */
 833                                 dput(dchild);
 834                                 return -ENOENT;
 835                         }
 836                 } else
 837                         dchild = dget(dparent);
 838         } else
 839                 dchild = lookup_one_len(name, dparent, namlen);
 840         if (IS_ERR(dchild))
 841                 return -ENOENT;
 842         rv = -ENOENT;
 843         if (d_mountpoint(dchild))
 844                 goto out;
 845         rv = fh_compose(fhp, exp, dchild, &cd->fh);
 846         if (rv)
 847                 goto out;
 848         if (!dchild->d_inode)
 849                 goto out;
 850         rv = 0;
 851 out:
 852         dput(dchild);
 853         return rv;
 854 }
 855
 856 __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen)
 857 {
 858         struct svc_fh   fh;
 859         int err;
 860
 861         fh_init(&fh, NFS3_FHSIZE);
 862         err = compose_entry_fh(cd, &fh, name, namlen);
 863         if (err) {
 864                 *p++ = 0;
 865                 *p++ = 0;
 866                 goto out;
 867         }
 868         p = encode_post_op_attr(cd->rqstp, p, &fh);
 869         *p++ = xdr_one;                 /* yes, a file handle follows */
 870         p = encode_fh(p, &fh);
 871 out:
 872         fh_put(&fh);
 873         return p;
 874 }
 875
 876 /*
 877  * Encode a directory entry. This one works for both normal readdir
 878  * and readdirplus.
 879  * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
 880  * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
 881  *
 882  * The readdirplus baggage is 1+21 words for post_op_attr, plus the
 883  * file handle.
 884  */
 885
 886 #define NFS3_ENTRY_BAGGAGE      (2 + 1 + 2 + 1)
 887 #define NFS3_ENTRYPLUS_BAGGAGE  (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
 888 static int
 889 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
 890              loff_t offset, u64 ino, unsigned int d_type, int plus)
 891 {
 892         struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
 893                                                         common);
 894         __be32          *p = cd->buffer;
 895         caddr_t         curr_page_addr = NULL;
 896         int             pn;             /* current page number */
 897         int             slen;           /* string (name) length */
 898         int             elen;           /* estimated entry length in words */
 899         int             num_entry_words = 0;    /* actual number of words */
 900
 901         if (cd->offset) {
 902                 u64 offset64 = offset;
 903
 904                 if (unlikely(cd->offset1)) {
 905                         /* we ended up with offset on a page boundary */
 906                         *cd->offset = htonl(offset64 >> 32);
 907                         *cd->offset1 = htonl(offset64 & 0xffffffff);
 908                         cd->offset1 = NULL;
 909                 } else {
 910                         xdr_encode_hyper(cd->offset, offset64);
 911                 }
 912         }
 913
 914         /*
 915         dprintk("encode_entry(%.*s @%ld%s)\n",
 916                 namlen, name, (long) offset, plus? " plus" : "");
 917          */
 918
 919         /* truncate filename if too long */
 920         if (namlen > NFS3_MAXNAMLEN)
 921                 namlen = NFS3_MAXNAMLEN;
 922
 923         slen = XDR_QUADLEN(namlen);
 924         elen = slen + NFS3_ENTRY_BAGGAGE
 925                 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
 926
 927         if (cd->buflen < elen) {
 928                 cd->common.err = nfserr_toosmall;
 929                 return -EINVAL;
 930         }
 931
 932         /* determine which page in rq_respages[] we are currently filling */
 933         for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
 934                 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
 935
 936                 if (((caddr_t)cd->buffer >= curr_page_addr) &&
 937                     ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
 938                         break;
 939         }
 940
 941         if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
 942                 /* encode entry in current page */
 943
 944                 p = encode_entry_baggage(cd, p, name, namlen, ino);
 945
 946                 if (plus)
 947                         p = encode_entryplus_baggage(cd, p, name, namlen);
 948                 num_entry_words = p - cd->buffer;
 949         } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
 950                 /* temporarily encode entry into next page, then move back to
 951                  * current and next page in rq_respages[] */
 952                 __be32 *p1, *tmp;
 953                 int len1, len2;
 954
 955                 /* grab next page for temporary storage of entry */
 956                 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
 957
 958                 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
 959
 960                 if (plus)
 961                         p1 = encode_entryplus_baggage(cd, p1, name, namlen);
 962
 963                 /* determine entry word length and lengths to go in pages */
 964                 num_entry_words = p1 - tmp;
 965                 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
 966                 if ((num_entry_words << 2) < len1) {
 967                         /* the actual number of words in the entry is less
 968                          * than elen and can still fit in the current page
 969                          */
 970                         memmove(p, tmp, num_entry_words << 2);
 971                         p += num_entry_words;
 972
 973                         /* update offset */
 974                         cd->offset = cd->buffer + (cd->offset - tmp);
 975                 } else {
 976                         unsigned int offset_r = (cd->offset - tmp) << 2;
 977
 978                         /* update pointer to offset location.
 979                          * This is a 64bit quantity, so we need to
 980                          * deal with 3 cases:
 981                          *  -   entirely in first page
 982                          *  -   entirely in second page
 983                          *  -   4 bytes in each page
 984                          */
 985                         if (offset_r + 8 <= len1) {
 986                                 cd->offset = p + (cd->offset - tmp);
 987                         } else if (offset_r >= len1) {
 988                                 cd->offset -= len1 >> 2;
 989                         } else {
 990                                 /* sitting on the fence */
 991                                 BUG_ON(offset_r != len1 - 4);
 992                                 cd->offset = p + (cd->offset - tmp);
 993                                 cd->offset1 = tmp;
 994                         }
 995
 996                         len2 = (num_entry_words << 2) - len1;
 997
 998                         /* move from temp page to current and next pages */
 999                         memmove(p, tmp, len1);
1000                         memmove(tmp, (caddr_t)tmp+len1, len2);
1001
1002                         p = tmp + (len2 >> 2);
1003                 }
1004         }
1005         else {
1006                 cd->common.err = nfserr_toosmall;
1007                 return -EINVAL;
1008         }
1009
1010         cd->buflen -= num_entry_words;
1011         cd->buffer = p;
1012         cd->common.err = nfs_ok;
1013         return 0;
1014
1015 }
1016
1017 int
1018 nfs3svc_encode_entry(void *cd, const char *name,
1019                      int namlen, loff_t offset, u64 ino, unsigned int d_type)
1020 {
1021         return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1022 }
1023
1024 int
1025 nfs3svc_encode_entry_plus(void *cd, const char *name,
1026                           int namlen, loff_t offset, u64 ino,
1027                           unsigned int d_type)
1028 {
1029         return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1030 }
1031
1032 /* FSSTAT */
1033 int
1034 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1035                                         struct nfsd3_fsstatres *resp)
1036 {
1037         struct kstatfs  *s = &resp->stats;
1038         u64             bs = s->f_bsize;
1039
1040         *p++ = xdr_zero;        /* no post_op_attr */
1041
1042         if (resp->status == 0) {
1043                 p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
1044                 p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
1045                 p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
1046                 p = xdr_encode_hyper(p, s->f_files);    /* total inodes */
1047                 p = xdr_encode_hyper(p, s->f_ffree);    /* free inodes */
1048                 p = xdr_encode_hyper(p, s->f_ffree);    /* user available inodes */
1049                 *p++ = htonl(resp->invarsec);   /* mean unchanged time */
1050         }
1051         return xdr_ressize_check(rqstp, p);
1052 }
1053
1054 /* FSINFO */
1055 int
1056 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1057                                         struct nfsd3_fsinfores *resp)
1058 {
1059         *p++ = xdr_zero;        /* no post_op_attr */
1060
1061         if (resp->status == 0) {
1062                 *p++ = htonl(resp->f_rtmax);
1063                 *p++ = htonl(resp->f_rtpref);
1064                 *p++ = htonl(resp->f_rtmult);
1065                 *p++ = htonl(resp->f_wtmax);
1066                 *p++ = htonl(resp->f_wtpref);
1067                 *p++ = htonl(resp->f_wtmult);
1068                 *p++ = htonl(resp->f_dtpref);
1069                 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1070                 *p++ = xdr_one;
1071                 *p++ = xdr_zero;
1072                 *p++ = htonl(resp->f_properties);
1073         }
1074
1075         return xdr_ressize_check(rqstp, p);
1076 }
1077
1078 /* PATHCONF */
1079 int
1080 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1081                                         struct nfsd3_pathconfres *resp)
1082 {
1083         *p++ = xdr_zero;        /* no post_op_attr */
1084
1085         if (resp->status == 0) {
1086                 *p++ = htonl(resp->p_link_max);
1087                 *p++ = htonl(resp->p_name_max);
1088                 *p++ = htonl(resp->p_no_trunc);
1089                 *p++ = htonl(resp->p_chown_restricted);
1090                 *p++ = htonl(resp->p_case_insensitive);
1091                 *p++ = htonl(resp->p_case_preserving);
1092         }
1093
1094         return xdr_ressize_check(rqstp, p);
1095 }
1096
1097 /* COMMIT */
1098 int
1099 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1100                                         struct nfsd3_commitres *resp)
1101 {
1102         p = encode_wcc_data(rqstp, p, &resp->fh);
1103         /* Write verifier */
1104         if (resp->status == 0) {
1105                 *p++ = htonl(nfssvc_boot.tv_sec);
1106                 *p++ = htonl(nfssvc_boot.tv_usec);
1107         }
1108         return xdr_ressize_check(rqstp, p);
1109 }
1110
1111 /*
1112  * XDR release functions
1113  */
1114 int
1115 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1116                                         struct nfsd3_attrstat *resp)
1117 {
1118         fh_put(&resp->fh);
1119         return 1;
1120 }
1121
1122 int
1123 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1124                                         struct nfsd3_fhandle_pair *resp)
1125 {
1126         fh_put(&resp->fh1);
1127         fh_put(&resp->fh2);
1128         return 1;
1129 }