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