fs/nfsd/nfs3xdr.c

   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  */
  19 static 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  */
  29 static __be32 *
  30 encode_time3(__be32 *p, struct timespec *time)
  31 {
  32         *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec);
  33         return p;
  34 }
  35
  36 static __be32 *
  37 decode_time3(__be32 *p, struct timespec *time)
  38 {
  39         time->tv_sec = ntohl(*p++);
  40         time->tv_nsec = ntohl(*p++);
  41         return p;
  42 }
  43
  44 static __be32 *
  45 decode_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
  64 static __be32 *
  65 encode_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  */
  78 static __be32 *
  79 decode_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
  94 static __be32 *
  95 decode_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
 140 static __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
 161 static __be32 *
 162 encode_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
 187 static __be32 *
 188 encode_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  */
 200 static __be32 *
 201 encode_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 *
 221 nfs3svc_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  */
 229 static __be32 *
 230 encode_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  */
 253 void 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         else
 266                 fhp->fh_post_saved = 1;
 267 }
 268
 269 /*
 270  * XDR decode functions
 271  */
 272 int
 273 nfs3svc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p, struct nfsd_fhandle *args)
 274 {
 275         if (!(p = decode_fh(p, &args->fh)))
 276                 return 0;
 277         return xdr_argsize_check(rqstp, p);
 278 }
 279
 280 int
 281 nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p,
 282                                         struct nfsd3_sattrargs *args)
 283 {
 284         if (!(p = decode_fh(p, &args->fh)))
 285                 return 0;
 286         p = decode_sattr3(p, &args->attrs);
 287
 288         if ((args->check_guard = ntohl(*p++)) != 0) {
 289                 struct timespec time;
 290                 p = decode_time3(p, &time);
 291                 args->guardtime = time.tv_sec;
 292         }
 293
 294         return xdr_argsize_check(rqstp, p);
 295 }
 296
 297 int
 298 nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p,
 299                                         struct nfsd3_diropargs *args)
 300 {
 301         if (!(p = decode_fh(p, &args->fh))
 302          || !(p = decode_filename(p, &args->name, &args->len)))
 303                 return 0;
 304
 305         return xdr_argsize_check(rqstp, p);
 306 }
 307
 308 int
 309 nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p,
 310                                         struct nfsd3_accessargs *args)
 311 {
 312         if (!(p = decode_fh(p, &args->fh)))
 313                 return 0;
 314         args->access = ntohl(*p++);
 315
 316         return xdr_argsize_check(rqstp, p);
 317 }
 318
 319 int
 320 nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p,
 321                                         struct nfsd3_readargs *args)
 322 {
 323         unsigned int len;
 324         int v,pn;
 325         u32 max_blocksize = svc_max_payload(rqstp);
 326
 327         if (!(p = decode_fh(p, &args->fh)))
 328                 return 0;
 329         p = xdr_decode_hyper(p, &args->offset);
 330
 331         len = args->count = ntohl(*p++);
 332
 333         if (len > max_blocksize)
 334                 len = max_blocksize;
 335
 336         /* set up the kvec */
 337         v=0;
 338         while (len > 0) {
 339                 pn = rqstp->rq_resused++;
 340                 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_respages[pn]);
 341                 rqstp->rq_vec[v].iov_len = len < PAGE_SIZE? len : PAGE_SIZE;
 342                 len -= rqstp->rq_vec[v].iov_len;
 343                 v++;
 344         }
 345         args->vlen = v;
 346         return xdr_argsize_check(rqstp, p);
 347 }
 348
 349 int
 350 nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p,
 351                                         struct nfsd3_writeargs *args)
 352 {
 353         unsigned int len, v, hdr, dlen;
 354         u32 max_blocksize = svc_max_payload(rqstp);
 355
 356         if (!(p = decode_fh(p, &args->fh)))
 357                 return 0;
 358         p = xdr_decode_hyper(p, &args->offset);
 359
 360         args->count = ntohl(*p++);
 361         args->stable = ntohl(*p++);
 362         len = args->len = ntohl(*p++);
 363         /*
 364          * The count must equal the amount of data passed.
 365          */
 366         if (args->count != args->len)
 367                 return 0;
 368
 369         /*
 370          * Check to make sure that we got the right number of
 371          * bytes.
 372          */
 373         hdr = (void*)p - rqstp->rq_arg.head[0].iov_base;
 374         dlen = rqstp->rq_arg.head[0].iov_len + rqstp->rq_arg.page_len
 375                 - hdr;
 376         /*
 377          * Round the length of the data which was specified up to
 378          * the next multiple of XDR units and then compare that
 379          * against the length which was actually received.
 380          * Note that when RPCSEC/GSS (for example) is used, the
 381          * data buffer can be padded so dlen might be larger
 382          * than required.  It must never be smaller.
 383          */
 384         if (dlen < XDR_QUADLEN(len)*4)
 385                 return 0;
 386
 387         if (args->count > max_blocksize) {
 388                 args->count = max_blocksize;
 389                 len = args->len = max_blocksize;
 390         }
 391         rqstp->rq_vec[0].iov_base = (void*)p;
 392         rqstp->rq_vec[0].iov_len = rqstp->rq_arg.head[0].iov_len - hdr;
 393         v = 0;
 394         while (len > rqstp->rq_vec[v].iov_len) {
 395                 len -= rqstp->rq_vec[v].iov_len;
 396                 v++;
 397                 rqstp->rq_vec[v].iov_base = page_address(rqstp->rq_pages[v]);
 398                 rqstp->rq_vec[v].iov_len = PAGE_SIZE;
 399         }
 400         rqstp->rq_vec[v].iov_len = len;
 401         args->vlen = v + 1;
 402         return 1;
 403 }
 404
 405 int
 406 nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p,
 407                                         struct nfsd3_createargs *args)
 408 {
 409         if (!(p = decode_fh(p, &args->fh))
 410          || !(p = decode_filename(p, &args->name, &args->len)))
 411                 return 0;
 412
 413         switch (args->createmode = ntohl(*p++)) {
 414         case NFS3_CREATE_UNCHECKED:
 415         case NFS3_CREATE_GUARDED:
 416                 p = decode_sattr3(p, &args->attrs);
 417                 break;
 418         case NFS3_CREATE_EXCLUSIVE:
 419                 args->verf = p;
 420                 p += 2;
 421                 break;
 422         default:
 423                 return 0;
 424         }
 425
 426         return xdr_argsize_check(rqstp, p);
 427 }
 428 int
 429 nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p,
 430                                         struct nfsd3_createargs *args)
 431 {
 432         if (!(p = decode_fh(p, &args->fh)) ||
 433             !(p = decode_filename(p, &args->name, &args->len)))
 434                 return 0;
 435         p = decode_sattr3(p, &args->attrs);
 436
 437         return xdr_argsize_check(rqstp, p);
 438 }
 439
 440 int
 441 nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p,
 442                                         struct nfsd3_symlinkargs *args)
 443 {
 444         unsigned int len, avail;
 445         char *old, *new;
 446         struct kvec *vec;
 447
 448         if (!(p = decode_fh(p, &args->ffh)) ||
 449             !(p = decode_filename(p, &args->fname, &args->flen))
 450                 )
 451                 return 0;
 452         p = decode_sattr3(p, &args->attrs);
 453
 454         /* now decode the pathname, which might be larger than the first page.
 455          * As we have to check for nul's anyway, we copy it into a new page
 456          * This page appears in the rq_res.pages list, but as pages_len is always
 457          * 0, it won't get in the way
 458          */
 459         len = ntohl(*p++);
 460         if (len == 0 || len > NFS3_MAXPATHLEN || len >= PAGE_SIZE)
 461                 return 0;
 462         args->tname = new =
 463                 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
 464         args->tlen = len;
 465         /* first copy and check from the first page */
 466         old = (char*)p;
 467         vec = &rqstp->rq_arg.head[0];
 468         avail = vec->iov_len - (old - (char*)vec->iov_base);
 469         while (len && avail && *old) {
 470                 *new++ = *old++;
 471                 len--;
 472                 avail--;
 473         }
 474         /* now copy next page if there is one */
 475         if (len && !avail && rqstp->rq_arg.page_len) {
 476                 avail = rqstp->rq_arg.page_len;
 477                 if (avail > PAGE_SIZE)
 478                         avail = PAGE_SIZE;
 479                 old = page_address(rqstp->rq_arg.pages[0]);
 480         }
 481         while (len && avail && *old) {
 482                 *new++ = *old++;
 483                 len--;
 484                 avail--;
 485         }
 486         *new = '\0';
 487         if (len)
 488                 return 0;
 489
 490         return 1;
 491 }
 492
 493 int
 494 nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p,
 495                                         struct nfsd3_mknodargs *args)
 496 {
 497         if (!(p = decode_fh(p, &args->fh))
 498          || !(p = decode_filename(p, &args->name, &args->len)))
 499                 return 0;
 500
 501         args->ftype = ntohl(*p++);
 502
 503         if (args->ftype == NF3BLK  || args->ftype == NF3CHR
 504          || args->ftype == NF3SOCK || args->ftype == NF3FIFO)
 505                 p = decode_sattr3(p, &args->attrs);
 506
 507         if (args->ftype == NF3BLK || args->ftype == NF3CHR) {
 508                 args->major = ntohl(*p++);
 509                 args->minor = ntohl(*p++);
 510         }
 511
 512         return xdr_argsize_check(rqstp, p);
 513 }
 514
 515 int
 516 nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p,
 517                                         struct nfsd3_renameargs *args)
 518 {
 519         if (!(p = decode_fh(p, &args->ffh))
 520          || !(p = decode_filename(p, &args->fname, &args->flen))
 521          || !(p = decode_fh(p, &args->tfh))
 522          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 523                 return 0;
 524
 525         return xdr_argsize_check(rqstp, p);
 526 }
 527
 528 int
 529 nfs3svc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p,
 530                                         struct nfsd3_readlinkargs *args)
 531 {
 532         if (!(p = decode_fh(p, &args->fh)))
 533                 return 0;
 534         args->buffer =
 535                 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
 536
 537         return xdr_argsize_check(rqstp, p);
 538 }
 539
 540 int
 541 nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p,
 542                                         struct nfsd3_linkargs *args)
 543 {
 544         if (!(p = decode_fh(p, &args->ffh))
 545          || !(p = decode_fh(p, &args->tfh))
 546          || !(p = decode_filename(p, &args->tname, &args->tlen)))
 547                 return 0;
 548
 549         return xdr_argsize_check(rqstp, p);
 550 }
 551
 552 int
 553 nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p,
 554                                         struct nfsd3_readdirargs *args)
 555 {
 556         if (!(p = decode_fh(p, &args->fh)))
 557                 return 0;
 558         p = xdr_decode_hyper(p, &args->cookie);
 559         args->verf   = p; p += 2;
 560         args->dircount = ~0;
 561         args->count  = ntohl(*p++);
 562
 563         if (args->count > PAGE_SIZE)
 564                 args->count = PAGE_SIZE;
 565
 566         args->buffer =
 567                 page_address(rqstp->rq_respages[rqstp->rq_resused++]);
 568
 569         return xdr_argsize_check(rqstp, p);
 570 }
 571
 572 int
 573 nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p,
 574                                         struct nfsd3_readdirargs *args)
 575 {
 576         int len, pn;
 577         u32 max_blocksize = svc_max_payload(rqstp);
 578
 579         if (!(p = decode_fh(p, &args->fh)))
 580                 return 0;
 581         p = xdr_decode_hyper(p, &args->cookie);
 582         args->verf     = p; p += 2;
 583         args->dircount = ntohl(*p++);
 584         args->count    = ntohl(*p++);
 585
 586         len = (args->count > max_blocksize) ? max_blocksize :
 587                                                   args->count;
 588         args->count = len;
 589
 590         while (len > 0) {
 591                 pn = rqstp->rq_resused++;
 592                 if (!args->buffer)
 593                         args->buffer = page_address(rqstp->rq_respages[pn]);
 594                 len -= PAGE_SIZE;
 595         }
 596
 597         return xdr_argsize_check(rqstp, p);
 598 }
 599
 600 int
 601 nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p,
 602                                         struct nfsd3_commitargs *args)
 603 {
 604         if (!(p = decode_fh(p, &args->fh)))
 605                 return 0;
 606         p = xdr_decode_hyper(p, &args->offset);
 607         args->count = ntohl(*p++);
 608
 609         return xdr_argsize_check(rqstp, p);
 610 }
 611
 612 /*
 613  * XDR encode functions
 614  */
 615 /*
 616  * There must be an encoding function for void results so svc_process
 617  * will work properly.
 618  */
 619 int
 620 nfs3svc_encode_voidres(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 621 {
 622         return xdr_ressize_check(rqstp, p);
 623 }
 624
 625 /* GETATTR */
 626 int
 627 nfs3svc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p,
 628                                         struct nfsd3_attrstat *resp)
 629 {
 630         if (resp->status == 0) {
 631                 lease_get_mtime(resp->fh.fh_dentry->d_inode,
 632                                 &resp->stat.mtime);
 633                 p = encode_fattr3(rqstp, p, &resp->fh, &resp->stat);
 634         }
 635         return xdr_ressize_check(rqstp, p);
 636 }
 637
 638 /* SETATTR, REMOVE, RMDIR */
 639 int
 640 nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p,
 641                                         struct nfsd3_attrstat *resp)
 642 {
 643         p = encode_wcc_data(rqstp, p, &resp->fh);
 644         return xdr_ressize_check(rqstp, p);
 645 }
 646
 647 /* LOOKUP */
 648 int
 649 nfs3svc_encode_diropres(struct svc_rqst *rqstp, __be32 *p,
 650                                         struct nfsd3_diropres *resp)
 651 {
 652         if (resp->status == 0) {
 653                 p = encode_fh(p, &resp->fh);
 654                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 655         }
 656         p = encode_post_op_attr(rqstp, p, &resp->dirfh);
 657         return xdr_ressize_check(rqstp, p);
 658 }
 659
 660 /* ACCESS */
 661 int
 662 nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p,
 663                                         struct nfsd3_accessres *resp)
 664 {
 665         p = encode_post_op_attr(rqstp, p, &resp->fh);
 666         if (resp->status == 0)
 667                 *p++ = htonl(resp->access);
 668         return xdr_ressize_check(rqstp, p);
 669 }
 670
 671 /* READLINK */
 672 int
 673 nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p,
 674                                         struct nfsd3_readlinkres *resp)
 675 {
 676         p = encode_post_op_attr(rqstp, p, &resp->fh);
 677         if (resp->status == 0) {
 678                 *p++ = htonl(resp->len);
 679                 xdr_ressize_check(rqstp, p);
 680                 rqstp->rq_res.page_len = resp->len;
 681                 if (resp->len & 3) {
 682                         /* need to pad the tail */
 683                         rqstp->rq_res.tail[0].iov_base = p;
 684                         *p = 0;
 685                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
 686                 }
 687                 return 1;
 688         } else
 689                 return xdr_ressize_check(rqstp, p);
 690 }
 691
 692 /* READ */
 693 int
 694 nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p,
 695                                         struct nfsd3_readres *resp)
 696 {
 697         p = encode_post_op_attr(rqstp, p, &resp->fh);
 698         if (resp->status == 0) {
 699                 *p++ = htonl(resp->count);
 700                 *p++ = htonl(resp->eof);
 701                 *p++ = htonl(resp->count);      /* xdr opaque count */
 702                 xdr_ressize_check(rqstp, p);
 703                 /* now update rqstp->rq_res to reflect data aswell */
 704                 rqstp->rq_res.page_len = resp->count;
 705                 if (resp->count & 3) {
 706                         /* need to pad the tail */
 707                         rqstp->rq_res.tail[0].iov_base = p;
 708                         *p = 0;
 709                         rqstp->rq_res.tail[0].iov_len = 4 - (resp->count & 3);
 710                 }
 711                 return 1;
 712         } else
 713                 return xdr_ressize_check(rqstp, p);
 714 }
 715
 716 /* WRITE */
 717 int
 718 nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p,
 719                                         struct nfsd3_writeres *resp)
 720 {
 721         p = encode_wcc_data(rqstp, p, &resp->fh);
 722         if (resp->status == 0) {
 723                 *p++ = htonl(resp->count);
 724                 *p++ = htonl(resp->committed);
 725                 *p++ = htonl(nfssvc_boot.tv_sec);
 726                 *p++ = htonl(nfssvc_boot.tv_usec);
 727         }
 728         return xdr_ressize_check(rqstp, p);
 729 }
 730
 731 /* CREATE, MKDIR, SYMLINK, MKNOD */
 732 int
 733 nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p,
 734                                         struct nfsd3_diropres *resp)
 735 {
 736         if (resp->status == 0) {
 737                 *p++ = xdr_one;
 738                 p = encode_fh(p, &resp->fh);
 739                 p = encode_post_op_attr(rqstp, p, &resp->fh);
 740         }
 741         p = encode_wcc_data(rqstp, p, &resp->dirfh);
 742         return xdr_ressize_check(rqstp, p);
 743 }
 744
 745 /* RENAME */
 746 int
 747 nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p,
 748                                         struct nfsd3_renameres *resp)
 749 {
 750         p = encode_wcc_data(rqstp, p, &resp->ffh);
 751         p = encode_wcc_data(rqstp, p, &resp->tfh);
 752         return xdr_ressize_check(rqstp, p);
 753 }
 754
 755 /* LINK */
 756 int
 757 nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p,
 758                                         struct nfsd3_linkres *resp)
 759 {
 760         p = encode_post_op_attr(rqstp, p, &resp->fh);
 761         p = encode_wcc_data(rqstp, p, &resp->tfh);
 762         return xdr_ressize_check(rqstp, p);
 763 }
 764
 765 /* READDIR */
 766 int
 767 nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p,
 768                                         struct nfsd3_readdirres *resp)
 769 {
 770         p = encode_post_op_attr(rqstp, p, &resp->fh);
 771
 772         if (resp->status == 0) {
 773                 /* stupid readdir cookie */
 774                 memcpy(p, resp->verf, 8); p += 2;
 775                 xdr_ressize_check(rqstp, p);
 776                 if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE)
 777                         return 1; /*No room for trailer */
 778                 rqstp->rq_res.page_len = (resp->count) << 2;
 779
 780                 /* add the 'tail' to the end of the 'head' page - page 0. */
 781                 rqstp->rq_res.tail[0].iov_base = p;
 782                 *p++ = 0;               /* no more entries */
 783                 *p++ = htonl(resp->common.err == nfserr_eof);
 784                 rqstp->rq_res.tail[0].iov_len = 2<<2;
 785                 return 1;
 786         } else
 787                 return xdr_ressize_check(rqstp, p);
 788 }
 789
 790 static __be32 *
 791 encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name,
 792              int namlen, u64 ino)
 793 {
 794         *p++ = xdr_one;                          /* mark entry present */
 795         p    = xdr_encode_hyper(p, ino);         /* file id */
 796         p    = xdr_encode_array(p, name, namlen);/* name length & name */
 797
 798         cd->offset = p;                         /* remember pointer */
 799         p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */
 800
 801         return p;
 802 }
 803
 804 static int
 805 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp,
 806                 const char *name, int namlen)
 807 {
 808         struct svc_export       *exp;
 809         struct dentry           *dparent, *dchild;
 810         int rv = 0;
 811
 812         dparent = cd->fh.fh_dentry;
 813         exp  = cd->fh.fh_export;
 814
 815         if (isdotent(name, namlen)) {
 816                 if (namlen == 2) {
 817                         dchild = dget_parent(dparent);
 818                         if (dchild == dparent) {
 819                                 /* filesystem root - cannot return filehandle for ".." */
 820                                 dput(dchild);
 821                                 return -ENOENT;
 822                         }
 823                 } else
 824                         dchild = dget(dparent);
 825         } else
 826                 dchild = lookup_one_len(name, dparent, namlen);
 827         if (IS_ERR(dchild))
 828                 return -ENOENT;
 829         rv = -ENOENT;
 830         if (d_mountpoint(dchild))
 831                 goto out;
 832         rv = fh_compose(fhp, exp, dchild, &cd->fh);
 833         if (rv)
 834                 goto out;
 835         if (!dchild->d_inode)
 836                 goto out;
 837         rv = 0;
 838 out:
 839         dput(dchild);
 840         return rv;
 841 }
 842
 843 __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen)
 844 {
 845         struct svc_fh   fh;
 846         int err;
 847
 848         fh_init(&fh, NFS3_FHSIZE);
 849         err = compose_entry_fh(cd, &fh, name, namlen);
 850         if (err) {
 851                 *p++ = 0;
 852                 *p++ = 0;
 853                 goto out;
 854         }
 855         p = encode_post_op_attr(cd->rqstp, p, &fh);
 856         *p++ = xdr_one;                 /* yes, a file handle follows */
 857         p = encode_fh(p, &fh);
 858 out:
 859         fh_put(&fh);
 860         return p;
 861 }
 862
 863 /*
 864  * Encode a directory entry. This one works for both normal readdir
 865  * and readdirplus.
 866  * The normal readdir reply requires 2 (fileid) + 1 (stringlen)
 867  * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen.
 868  *
 869  * The readdirplus baggage is 1+21 words for post_op_attr, plus the
 870  * file handle.
 871  */
 872
 873 #define NFS3_ENTRY_BAGGAGE      (2 + 1 + 2 + 1)
 874 #define NFS3_ENTRYPLUS_BAGGAGE  (1 + 21 + 1 + (NFS3_FHSIZE >> 2))
 875 static int
 876 encode_entry(struct readdir_cd *ccd, const char *name, int namlen,
 877              loff_t offset, u64 ino, unsigned int d_type, int plus)
 878 {
 879         struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres,
 880                                                         common);
 881         __be32          *p = cd->buffer;
 882         caddr_t         curr_page_addr = NULL;
 883         int             pn;             /* current page number */
 884         int             slen;           /* string (name) length */
 885         int             elen;           /* estimated entry length in words */
 886         int             num_entry_words = 0;    /* actual number of words */
 887
 888         if (cd->offset) {
 889                 u64 offset64 = offset;
 890
 891                 if (unlikely(cd->offset1)) {
 892                         /* we ended up with offset on a page boundary */
 893                         *cd->offset = htonl(offset64 >> 32);
 894                         *cd->offset1 = htonl(offset64 & 0xffffffff);
 895                         cd->offset1 = NULL;
 896                 } else {
 897                         xdr_encode_hyper(cd->offset, offset64);
 898                 }
 899         }
 900
 901         /*
 902         dprintk("encode_entry(%.*s @%ld%s)\n",
 903                 namlen, name, (long) offset, plus? " plus" : "");
 904          */
 905
 906         /* truncate filename if too long */
 907         if (namlen > NFS3_MAXNAMLEN)
 908                 namlen = NFS3_MAXNAMLEN;
 909
 910         slen = XDR_QUADLEN(namlen);
 911         elen = slen + NFS3_ENTRY_BAGGAGE
 912                 + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0);
 913
 914         if (cd->buflen < elen) {
 915                 cd->common.err = nfserr_toosmall;
 916                 return -EINVAL;
 917         }
 918
 919         /* determine which page in rq_respages[] we are currently filling */
 920         for (pn=1; pn < cd->rqstp->rq_resused; pn++) {
 921                 curr_page_addr = page_address(cd->rqstp->rq_respages[pn]);
 922
 923                 if (((caddr_t)cd->buffer >= curr_page_addr) &&
 924                     ((caddr_t)cd->buffer <  curr_page_addr + PAGE_SIZE))
 925                         break;
 926         }
 927
 928         if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) {
 929                 /* encode entry in current page */
 930
 931                 p = encode_entry_baggage(cd, p, name, namlen, ino);
 932
 933                 if (plus)
 934                         p = encode_entryplus_baggage(cd, p, name, namlen);
 935                 num_entry_words = p - cd->buffer;
 936         } else if (cd->rqstp->rq_respages[pn+1] != NULL) {
 937                 /* temporarily encode entry into next page, then move back to
 938                  * current and next page in rq_respages[] */
 939                 __be32 *p1, *tmp;
 940                 int len1, len2;
 941
 942                 /* grab next page for temporary storage of entry */
 943                 p1 = tmp = page_address(cd->rqstp->rq_respages[pn+1]);
 944
 945                 p1 = encode_entry_baggage(cd, p1, name, namlen, ino);
 946
 947                 if (plus)
 948                         p1 = encode_entryplus_baggage(cd, p1, name, namlen);
 949
 950                 /* determine entry word length and lengths to go in pages */
 951                 num_entry_words = p1 - tmp;
 952                 len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer;
 953                 if ((num_entry_words << 2) < len1) {
 954                         /* the actual number of words in the entry is less
 955                          * than elen and can still fit in the current page
 956                          */
 957                         memmove(p, tmp, num_entry_words << 2);
 958                         p += num_entry_words;
 959
 960                         /* update offset */
 961                         cd->offset = cd->buffer + (cd->offset - tmp);
 962                 } else {
 963                         unsigned int offset_r = (cd->offset - tmp) << 2;
 964
 965                         /* update pointer to offset location.
 966                          * This is a 64bit quantity, so we need to
 967                          * deal with 3 cases:
 968                          *  -   entirely in first page
 969                          *  -   entirely in second page
 970                          *  -   4 bytes in each page
 971                          */
 972                         if (offset_r + 8 <= len1) {
 973                                 cd->offset = p + (cd->offset - tmp);
 974                         } else if (offset_r >= len1) {
 975                                 cd->offset -= len1 >> 2;
 976                         } else {
 977                                 /* sitting on the fence */
 978                                 BUG_ON(offset_r != len1 - 4);
 979                                 cd->offset = p + (cd->offset - tmp);
 980                                 cd->offset1 = tmp;
 981                         }
 982
 983                         len2 = (num_entry_words << 2) - len1;
 984
 985                         /* move from temp page to current and next pages */
 986                         memmove(p, tmp, len1);
 987                         memmove(tmp, (caddr_t)tmp+len1, len2);
 988
 989                         p = tmp + (len2 >> 2);
 990                 }
 991         }
 992         else {
 993                 cd->common.err = nfserr_toosmall;
 994                 return -EINVAL;
 995         }
 996
 997         cd->buflen -= num_entry_words;
 998         cd->buffer = p;
 999         cd->common.err = nfs_ok;
1000         return 0;
1001
1002 }
1003
1004 int
1005 nfs3svc_encode_entry(void *cd, const char *name,
1006                      int namlen, loff_t offset, u64 ino, unsigned int d_type)
1007 {
1008         return encode_entry(cd, name, namlen, offset, ino, d_type, 0);
1009 }
1010
1011 int
1012 nfs3svc_encode_entry_plus(void *cd, const char *name,
1013                           int namlen, loff_t offset, u64 ino,
1014                           unsigned int d_type)
1015 {
1016         return encode_entry(cd, name, namlen, offset, ino, d_type, 1);
1017 }
1018
1019 /* FSSTAT */
1020 int
1021 nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p,
1022                                         struct nfsd3_fsstatres *resp)
1023 {
1024         struct kstatfs  *s = &resp->stats;
1025         u64             bs = s->f_bsize;
1026
1027         *p++ = xdr_zero;        /* no post_op_attr */
1028
1029         if (resp->status == 0) {
1030                 p = xdr_encode_hyper(p, bs * s->f_blocks);      /* total bytes */
1031                 p = xdr_encode_hyper(p, bs * s->f_bfree);       /* free bytes */
1032                 p = xdr_encode_hyper(p, bs * s->f_bavail);      /* user available bytes */
1033                 p = xdr_encode_hyper(p, s->f_files);    /* total inodes */
1034                 p = xdr_encode_hyper(p, s->f_ffree);    /* free inodes */
1035                 p = xdr_encode_hyper(p, s->f_ffree);    /* user available inodes */
1036                 *p++ = htonl(resp->invarsec);   /* mean unchanged time */
1037         }
1038         return xdr_ressize_check(rqstp, p);
1039 }
1040
1041 /* FSINFO */
1042 int
1043 nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p,
1044                                         struct nfsd3_fsinfores *resp)
1045 {
1046         *p++ = xdr_zero;        /* no post_op_attr */
1047
1048         if (resp->status == 0) {
1049                 *p++ = htonl(resp->f_rtmax);
1050                 *p++ = htonl(resp->f_rtpref);
1051                 *p++ = htonl(resp->f_rtmult);
1052                 *p++ = htonl(resp->f_wtmax);
1053                 *p++ = htonl(resp->f_wtpref);
1054                 *p++ = htonl(resp->f_wtmult);
1055                 *p++ = htonl(resp->f_dtpref);
1056                 p = xdr_encode_hyper(p, resp->f_maxfilesize);
1057                 *p++ = xdr_one;
1058                 *p++ = xdr_zero;
1059                 *p++ = htonl(resp->f_properties);
1060         }
1061
1062         return xdr_ressize_check(rqstp, p);
1063 }
1064
1065 /* PATHCONF */
1066 int
1067 nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p,
1068                                         struct nfsd3_pathconfres *resp)
1069 {
1070         *p++ = xdr_zero;        /* no post_op_attr */
1071
1072         if (resp->status == 0) {
1073                 *p++ = htonl(resp->p_link_max);
1074                 *p++ = htonl(resp->p_name_max);
1075                 *p++ = htonl(resp->p_no_trunc);
1076                 *p++ = htonl(resp->p_chown_restricted);
1077                 *p++ = htonl(resp->p_case_insensitive);
1078                 *p++ = htonl(resp->p_case_preserving);
1079         }
1080
1081         return xdr_ressize_check(rqstp, p);
1082 }
1083
1084 /* COMMIT */
1085 int
1086 nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p,
1087                                         struct nfsd3_commitres *resp)
1088 {
1089         p = encode_wcc_data(rqstp, p, &resp->fh);
1090         /* Write verifier */
1091         if (resp->status == 0) {
1092                 *p++ = htonl(nfssvc_boot.tv_sec);
1093                 *p++ = htonl(nfssvc_boot.tv_usec);
1094         }
1095         return xdr_ressize_check(rqstp, p);
1096 }
1097
1098 /*
1099  * XDR release functions
1100  */
1101 int
1102 nfs3svc_release_fhandle(struct svc_rqst *rqstp, __be32 *p,
1103                                         struct nfsd3_attrstat *resp)
1104 {
1105         fh_put(&resp->fh);
1106         return 1;
1107 }
1108
1109 int
1110 nfs3svc_release_fhandle2(struct svc_rqst *rqstp, __be32 *p,
1111                                         struct nfsd3_fhandle_pair *resp)
1112 {
1113         fh_put(&resp->fh1);
1114         fh_put(&resp->fh2);
1115         return 1;
1116 }