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