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