source/modules/vfs_streams_depot.c

   1 /*
   2  * Store streams in a separate subdirectory
   3  *
   4  * Copyright (C) Volker Lendecke, 2007
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "includes.h"
  21
  22 #undef DBGC_CLASS
  23 #define DBGC_CLASS DBGC_VFS
  24
  25 /*
  26  * Excerpt from a mail from tridge:
  27  *
  28  * Volker, what I'm thinking of is this:
  29  * /mount-point/.streams/XX/YY/aaaa.bbbb/namedstream1
  30  * /mount-point/.streams/XX/YY/aaaa.bbbb/namedstream2
  31  *
  32  * where XX/YY is a 2 level hash based on the fsid/inode. "aaaa.bbbb"
  33  * is the fsid/inode. "namedstreamX" is a file named after the stream
  34  * name.
  35  */
  36
  37 static uint32_t hash_fn(DATA_BLOB key)
  38 {
  39         uint32_t value; /* Used to compute the hash value.  */
  40         uint32_t i;     /* Used to cycle through random values. */
  41
  42         /* Set the initial value from the key size. */
  43         for (value = 0x238F13AF * key.length, i=0; i < key.length; i++)
  44                 value = (value + (key.data[i] << (i*5 % 24)));
  45
  46         return (1103515243 * value + 12345);
  47 }
  48
  49 /*
  50  * With the hashing scheme based on the inode we need to protect against
  51  * streams showing up on files with re-used inodes. This can happen if we
  52  * create a stream directory from within Samba, and a local process or NFS
  53  * client deletes the file without deleting the streams directory. When the
  54  * inode is re-used and the stream directory is still around, the streams in
  55  * there would be show up as belonging to the new file.
  56  *
  57  * There are several workarounds for this, probably the easiest one is on
  58  * systems which have a true birthtime stat element: When the file has a later
  59  * birthtime than the streams directory, then we have to recreate the
  60  * directory.
  61  *
  62  * The other workaround is to somehow mark the file as generated by Samba with
  63  * something that a NFS client would not do. The closest one is a special
  64  * xattr value being set. On systems which do not support xattrs, it might be
  65  * an option to put in a special ACL entry for a non-existing group.
  66  */
  67
  68 #define SAMBA_XATTR_MARKER "user.SAMBA_STREAMS"
  69
  70 static bool file_is_valid(vfs_handle_struct *handle, const char *path,
  71                           bool check_valid)
  72 {
  73         char buf;
  74
  75         if (!check_valid) {
  76                 return true;
  77         }
  78
  79         DEBUG(10, ("file_is_valid (%s) called\n", path));
  80
  81         if (SMB_VFS_GETXATTR(handle->conn, path, SAMBA_XATTR_MARKER,
  82                                   &buf, sizeof(buf)) != sizeof(buf)) {
  83                 DEBUG(10, ("GETXATTR failed: %s\n", strerror(errno)));
  84                 return false;
  85         }
  86
  87         if (buf != '1') {
  88                 DEBUG(10, ("got wrong buffer content: '%c'\n", buf));
  89                 return false;
  90         }
  91
  92         return true;
  93 }
  94
  95 static bool mark_file_valid(vfs_handle_struct *handle, const char *path,
  96                             bool check_valid)
  97 {
  98         char buf = '1';
  99         int ret;
 100
 101         if (!check_valid) {
 102                 return true;
 103         }
 104
 105         DEBUG(10, ("marking file %s as valid\n", path));
 106
 107         ret = SMB_VFS_SETXATTR(handle->conn, path, SAMBA_XATTR_MARKER,
 108                                     &buf, sizeof(buf), 0);
 109
 110         if (ret == -1) {
 111                 DEBUG(10, ("SETXATTR failed: %s\n", strerror(errno)));
 112                 return false;
 113         }
 114
 115         return true;
 116 }
 117
 118 static char *stream_dir(vfs_handle_struct *handle, const char *base_path,
 119                         const SMB_STRUCT_STAT *base_sbuf, bool create_it)
 120 {
 121         uint32_t hash;
 122         char *result = NULL;
 123         SMB_STRUCT_STAT sbuf;
 124         uint8_t first, second;
 125         char *tmp;
 126         char *id_hex;
 127         struct file_id id;
 128         uint8 id_buf[16];
 129         bool check_valid;
 130         const char *rootdir;
 131
 132         check_valid = lp_parm_bool(SNUM(handle->conn),
 133                         "streams_depot", "check_valid", true);
 134
 135         tmp = talloc_asprintf(talloc_tos(), "%s/.streams", handle->conn->connectpath);
 136
 137         if (tmp == NULL) {
 138                 errno = ENOMEM;
 139                 goto fail;
 140         }
 141
 142         rootdir = lp_parm_const_string(
 143                 SNUM(handle->conn), "streams_depot", "directory",
 144                 tmp);
 145
 146         if (base_sbuf == NULL) {
 147                 if (SMB_VFS_NEXT_STAT(handle, base_path, &sbuf) == -1) {
 148                         /*
 149                          * base file is not there
 150                          */
 151                         goto fail;
 152                 }
 153                 base_sbuf = &sbuf;
 154         }
 155
 156         id = SMB_VFS_FILE_ID_CREATE(handle->conn, base_sbuf->st_dev,
 157                                     base_sbuf->st_ino);
 158
 159         push_file_id_16((char *)id_buf, &id);
 160
 161         hash = hash_fn(data_blob_const(id_buf, sizeof(id_buf)));
 162
 163         first = hash & 0xff;
 164         second = (hash >> 8) & 0xff;
 165
 166         id_hex = hex_encode(talloc_tos(), id_buf, sizeof(id_buf));
 167
 168         if (id_hex == NULL) {
 169                 errno = ENOMEM;
 170                 goto fail;
 171         }
 172
 173         result = talloc_asprintf(talloc_tos(), "%s/%2.2X/%2.2X/%s", rootdir,
 174                                  first, second, id_hex);
 175
 176         TALLOC_FREE(id_hex);
 177
 178         if (result == NULL) {
 179                 errno = ENOMEM;
 180                 return NULL;
 181         }
 182
 183         if (SMB_VFS_NEXT_STAT(handle, result, &sbuf) == 0) {
 184                 char *newname;
 185
 186                 if (!S_ISDIR(sbuf.st_mode)) {
 187                         errno = EINVAL;
 188                         goto fail;
 189                 }
 190
 191                 if (file_is_valid(handle, base_path, check_valid)) {
 192                         return result;
 193                 }
 194
 195                 /*
 196                  * Someone has recreated a file under an existing inode
 197                  * without deleting the streams directory. For now, just move
 198                  * it away.
 199                  */
 200
 201         again:
 202                 newname = talloc_asprintf(talloc_tos(), "lost-%lu", random());
 203                 if (newname == NULL) {
 204                         errno = ENOMEM;
 205                         goto fail;
 206                 }
 207
 208                 if (SMB_VFS_NEXT_RENAME(handle, result, newname) == -1) {
 209                         if ((errno == EEXIST) || (errno == ENOTEMPTY)) {
 210                                 TALLOC_FREE(newname);
 211                                 goto again;
 212                         }
 213                         goto fail;
 214                 }
 215
 216                 TALLOC_FREE(newname);
 217         }
 218
 219         if (!create_it) {
 220                 errno = ENOENT;
 221                 goto fail;
 222         }
 223
 224         if ((SMB_VFS_NEXT_MKDIR(handle, rootdir, 0755) != 0)
 225             && (errno != EEXIST)) {
 226                 goto fail;
 227         }
 228
 229         tmp = talloc_asprintf(result, "%s/%2.2X", rootdir, first);
 230         if (tmp == NULL) {
 231                 errno = ENOMEM;
 232                 goto fail;
 233         }
 234
 235         if ((SMB_VFS_NEXT_MKDIR(handle, tmp, 0755) != 0)
 236             && (errno != EEXIST)) {
 237                 goto fail;
 238         }
 239
 240         TALLOC_FREE(tmp);
 241
 242         tmp = talloc_asprintf(result, "%s/%2.2X/%2.2X", rootdir, first,
 243                               second);
 244         if (tmp == NULL) {
 245                 errno = ENOMEM;
 246                 goto fail;
 247         }
 248
 249         if ((SMB_VFS_NEXT_MKDIR(handle, tmp, 0755) != 0)
 250             && (errno != EEXIST)) {
 251                 goto fail;
 252         }
 253
 254         TALLOC_FREE(tmp);
 255
 256         if ((SMB_VFS_NEXT_MKDIR(handle, result, 0755) != 0)
 257             && (errno != EEXIST)) {
 258                 goto fail;
 259         }
 260
 261         if (!mark_file_valid(handle, base_path, check_valid)) {
 262                 goto fail;
 263         }
 264
 265         return result;
 266
 267  fail:
 268         TALLOC_FREE(result);
 269         return NULL;
 270 }
 271
 272 static char *stream_name(vfs_handle_struct *handle, const char *fname,
 273                          bool create_dir)
 274 {
 275         char *base = NULL;
 276         char *sname = NULL;
 277         char *id_hex = NULL;
 278         char *dirname, *stream_fname;
 279
 280         if (!NT_STATUS_IS_OK(split_ntfs_stream_name(talloc_tos(), fname,
 281                                                     &base, &sname))) {
 282                 DEBUG(10, ("split_ntfs_stream_name failed\n"));
 283                 errno = ENOMEM;
 284                 goto fail;
 285         }
 286
 287         /* if it's the ::$DATA stream just return the base file name */
 288         if (!sname) {
 289                 return base;
 290         }
 291
 292         dirname = stream_dir(handle, base, NULL, create_dir);
 293
 294         if (dirname == NULL) {
 295                 goto fail;
 296         }
 297
 298         stream_fname = talloc_asprintf(talloc_tos(), "%s/:%s", dirname, sname);
 299
 300         if (stream_fname == NULL) {
 301                 errno = ENOMEM;
 302                 goto fail;
 303         }
 304
 305         DEBUG(10, ("stream filename = %s\n", stream_fname));
 306
 307         TALLOC_FREE(base);
 308         TALLOC_FREE(sname);
 309         TALLOC_FREE(id_hex);
 310
 311         return stream_fname;
 312
 313  fail:
 314         DEBUG(5, ("stream_name failed: %s\n", strerror(errno)));
 315         TALLOC_FREE(base);
 316         TALLOC_FREE(sname);
 317         TALLOC_FREE(id_hex);
 318         return NULL;
 319 }
 320
 321 static NTSTATUS walk_streams(vfs_handle_struct *handle,
 322                              const char *fname,
 323                              const SMB_STRUCT_STAT *sbuf,
 324                              char **pdirname,
 325                              bool (*fn)(const char *dirname,
 326                                         const char *dirent,
 327                                         void *private_data),
 328                              void *private_data)
 329 {
 330         char *dirname;
 331         SMB_STRUCT_DIR *dirhandle = NULL;
 332         char *dirent;
 333
 334         dirname = stream_dir(handle, fname, sbuf, false);
 335
 336         if (dirname == NULL) {
 337                 if (errno == ENOENT) {
 338                         /*
 339                          * no stream around
 340                          */
 341                         return NT_STATUS_OK;
 342                 }
 343                 return map_nt_error_from_unix(errno);
 344         }
 345
 346         DEBUG(10, ("walk_streams: dirname=%s\n", dirname));
 347
 348         dirhandle = SMB_VFS_NEXT_OPENDIR(handle, dirname, NULL, 0);
 349
 350         if (dirhandle == NULL) {
 351                 TALLOC_FREE(dirname);
 352                 return map_nt_error_from_unix(errno);
 353         }
 354
 355         while ((dirent = vfs_readdirname(handle->conn, dirhandle)) != NULL) {
 356
 357                 if (ISDOT(dirent) || ISDOTDOT(dirent)) {
 358                         continue;
 359                 }
 360
 361                 DEBUG(10, ("walk_streams: dirent=%s\n", dirent));
 362
 363                 if (!fn(dirname, dirent, private_data)) {
 364                         break;
 365                 }
 366         }
 367
 368         SMB_VFS_NEXT_CLOSEDIR(handle, dirhandle);
 369
 370         if (pdirname != NULL) {
 371                 *pdirname = dirname;
 372         }
 373         else {
 374                 TALLOC_FREE(dirname);
 375         }
 376
 377         return NT_STATUS_OK;
 378 }
 379
 380 static int streams_depot_stat(vfs_handle_struct *handle, const char *fname,
 381                               SMB_STRUCT_STAT *sbuf)
 382 {
 383         char *stream_fname;
 384         int ret = -1;
 385
 386         DEBUG(10, ("streams_depot_stat called for [%s]\n", fname));
 387
 388         if (!is_ntfs_stream_name(fname)) {
 389                 return SMB_VFS_NEXT_STAT(handle, fname, sbuf);
 390         }
 391
 392         stream_fname = stream_name(handle, fname, false);
 393         if (stream_fname == NULL) {
 394                 goto done;
 395         }
 396
 397         ret = SMB_VFS_NEXT_STAT(handle, stream_fname, sbuf);
 398
 399  done:
 400         TALLOC_FREE(stream_fname);
 401         return ret;
 402 }
 403
 404 static int streams_depot_lstat(vfs_handle_struct *handle, const char *fname,
 405                                SMB_STRUCT_STAT *sbuf)
 406 {
 407         char *stream_fname;
 408         int ret = -1;
 409
 410         if (!is_ntfs_stream_name(fname)) {
 411                 return SMB_VFS_NEXT_LSTAT(handle, fname, sbuf);
 412         }
 413
 414         stream_fname = stream_name(handle, fname, false);
 415         if (stream_fname == NULL) {
 416                 goto done;
 417         }
 418
 419         ret = SMB_VFS_NEXT_LSTAT(handle, stream_fname, sbuf);
 420
 421  done:
 422         TALLOC_FREE(stream_fname);
 423         return ret;
 424 }
 425
 426 static int streams_depot_open(vfs_handle_struct *handle,  const char *fname,
 427                               files_struct *fsp, int flags, mode_t mode)
 428 {
 429         TALLOC_CTX *frame;
 430         char *base = NULL;
 431         char *sname = NULL;
 432         SMB_STRUCT_STAT base_sbuf;
 433         char *stream_fname;
 434         int ret = -1;
 435
 436         if (!is_ntfs_stream_name(fname)) {
 437                 return SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
 438         }
 439
 440         frame = talloc_stackframe();
 441
 442         if (!NT_STATUS_IS_OK(split_ntfs_stream_name(talloc_tos(), fname,
 443                                                     &base, &sname))) {
 444                 errno = ENOMEM;
 445                 goto done;
 446         }
 447
 448         if (!sname) {
 449                 ret = SMB_VFS_NEXT_OPEN(handle, base, fsp, flags, mode);
 450                 goto done;
 451         }
 452
 453         ret = SMB_VFS_NEXT_STAT(handle, base, &base_sbuf);
 454
 455         if (ret == -1) {
 456                 goto done;
 457         }
 458
 459         TALLOC_FREE(base);
 460
 461         stream_fname = stream_name(handle, fname, true);
 462         if (stream_fname == NULL) {
 463                 goto done;
 464         }
 465
 466         ret = SMB_VFS_NEXT_OPEN(handle, stream_fname, fsp, flags, mode);
 467
 468  done:
 469         TALLOC_FREE(frame);
 470         return ret;
 471 }
 472
 473 static int streams_depot_unlink(vfs_handle_struct *handle,  const char *fname)
 474 {
 475         int ret = -1;
 476         SMB_STRUCT_STAT sbuf;
 477
 478         DEBUG(10, ("streams_depot_unlink called for %s\n", fname));
 479
 480         if (is_ntfs_stream_name(fname)) {
 481                 char *stream_fname;
 482
 483                 stream_fname = stream_name(handle, fname, false);
 484                 if (stream_fname == NULL) {
 485                         return -1;
 486                 }
 487
 488                 ret = SMB_VFS_NEXT_UNLINK(handle, stream_fname);
 489
 490                 TALLOC_FREE(stream_fname);
 491                 return ret;
 492         }
 493
 494         /*
 495          * We potentially need to delete the per-inode streams directory
 496          */
 497
 498         if (lp_posix_pathnames()) {
 499                 ret = SMB_VFS_NEXT_LSTAT(handle, fname, &sbuf);
 500         } else {
 501                 ret = SMB_VFS_NEXT_STAT(handle, fname, &sbuf);
 502         }
 503
 504         if (ret == -1) {
 505                 return -1;
 506         }
 507
 508         if (sbuf.st_nlink == 1) {
 509                 char *dirname = stream_dir(handle, fname, &sbuf, false);
 510
 511                 if (dirname != NULL) {
 512                         SMB_VFS_NEXT_RMDIR(handle, dirname);
 513                 }
 514                 TALLOC_FREE(dirname);
 515         }
 516
 517         return SMB_VFS_NEXT_UNLINK(handle, fname);
 518 }
 519
 520 static int streams_depot_rename(vfs_handle_struct *handle,
 521                                 const char *oldname,
 522                                 const char *newname)
 523 {
 524         TALLOC_CTX *frame = NULL;
 525         int ret = -1;
 526         bool old_is_stream;
 527         bool new_is_stream;
 528         char *obase = NULL;
 529         char *osname = NULL;
 530         char *nbase = NULL;
 531         char *nsname = NULL;
 532         char *ostream_fname = NULL;
 533         char *nstream_fname = NULL;
 534         char *newname_full = NULL;
 535
 536         DEBUG(10, ("streams_depot_rename called for %s => %s\n",
 537                    oldname, newname));
 538
 539         old_is_stream = is_ntfs_stream_name(oldname);
 540         new_is_stream = is_ntfs_stream_name(newname);
 541
 542         if (!old_is_stream && !new_is_stream) {
 543                 return SMB_VFS_NEXT_RENAME(handle, oldname, newname);
 544         }
 545
 546         frame = talloc_stackframe();
 547
 548         if (!NT_STATUS_IS_OK(split_ntfs_stream_name(talloc_tos(), oldname,
 549                                                     &obase, &osname))) {
 550                 errno = ENOMEM;
 551                 goto done;
 552         }
 553
 554         if (!NT_STATUS_IS_OK(split_ntfs_stream_name(talloc_tos(), newname,
 555                                                     &nbase, &nsname))) {
 556                 errno = ENOMEM;
 557                 goto done;
 558         }
 559
 560         /* for now don't allow renames from or to the default stream */
 561         if (!osname || !nsname) {
 562                 errno = ENOSYS;
 563                 goto done;
 564         }
 565
 566         ostream_fname = stream_name(handle, oldname, false);
 567         if (ostream_fname == NULL) {
 568                 return -1;
 569         }
 570
 571         /*
 572          * Handle passing in a stream name without the base file.  This is
 573          * exercised by the NTRENAME streams rename path.
 574          */
 575         if (StrCaseCmp(nbase, "./") == 0) {
 576                 newname_full = talloc_asprintf(talloc_tos(), "%s:%s", obase,
 577                                                nsname);
 578                 if (newname_full == NULL) {
 579                         errno = ENOMEM;
 580                         goto done;
 581                 }
 582         }
 583
 584         nstream_fname = stream_name(handle,
 585                                     newname_full ? newname_full : newname,
 586                                     false);
 587         if (nstream_fname == NULL) {
 588                 return -1;
 589         }
 590
 591         ret = SMB_VFS_NEXT_RENAME(handle, ostream_fname, nstream_fname);
 592
 593 done:
 594         TALLOC_FREE(frame);
 595         return ret;
 596 }
 597
 598 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 599                            struct stream_struct **streams,
 600                            const char *name, SMB_OFF_T size,
 601                            SMB_OFF_T alloc_size)
 602 {
 603         struct stream_struct *tmp;
 604
 605         tmp = TALLOC_REALLOC_ARRAY(mem_ctx, *streams, struct stream_struct,
 606                                    (*num_streams)+1);
 607         if (tmp == NULL) {
 608                 return false;
 609         }
 610
 611         tmp[*num_streams].name = talloc_strdup(tmp, name);
 612         if (tmp[*num_streams].name == NULL) {
 613                 return false;
 614         }
 615
 616         tmp[*num_streams].size = size;
 617         tmp[*num_streams].alloc_size = alloc_size;
 618
 619         *streams = tmp;
 620         *num_streams += 1;
 621         return true;
 622 }
 623
 624 struct streaminfo_state {
 625         TALLOC_CTX *mem_ctx;
 626         vfs_handle_struct *handle;
 627         unsigned int num_streams;
 628         struct stream_struct *streams;
 629         NTSTATUS status;
 630 };
 631
 632 static bool collect_one_stream(const char *dirname,
 633                                const char *dirent,
 634                                void *private_data)
 635 {
 636         struct streaminfo_state *state =
 637                 (struct streaminfo_state *)private_data;
 638         char *full_sname;
 639         SMB_STRUCT_STAT sbuf;
 640
 641         if (asprintf(&full_sname, "%s/%s", dirname, dirent) == -1) {
 642                 state->status = NT_STATUS_NO_MEMORY;
 643                 return false;
 644         }
 645         if (SMB_VFS_NEXT_STAT(state->handle, full_sname, &sbuf) == -1) {
 646                 DEBUG(10, ("Could not stat %s: %s\n", full_sname,
 647                            strerror(errno)));
 648                 SAFE_FREE(full_sname);
 649                 return true;
 650         }
 651
 652         SAFE_FREE(full_sname);
 653
 654         if (!add_one_stream(state->mem_ctx,
 655                             &state->num_streams, &state->streams,
 656                             dirent, sbuf.st_size,
 657                             get_allocation_size(
 658                                     state->handle->conn, NULL, &sbuf))) {
 659                 state->status = NT_STATUS_NO_MEMORY;
 660                 return false;
 661         }
 662
 663         return true;
 664 }
 665
 666 static NTSTATUS streams_depot_streaminfo(vfs_handle_struct *handle,
 667                                          struct files_struct *fsp,
 668                                          const char *fname,
 669                                          TALLOC_CTX *mem_ctx,
 670                                          unsigned int *pnum_streams,
 671                                          struct stream_struct **pstreams)
 672 {
 673         SMB_STRUCT_STAT sbuf;
 674         int ret;
 675         NTSTATUS status;
 676         struct streaminfo_state state;
 677
 678         if ((fsp != NULL) && (fsp->fh->fd != -1)) {
 679                 if (is_ntfs_stream_name(fsp->fsp_name)) {
 680                         return NT_STATUS_INVALID_PARAMETER;
 681                 }
 682                 ret = SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf);
 683         }
 684         else {
 685                 if (is_ntfs_stream_name(fname)) {
 686                         return NT_STATUS_INVALID_PARAMETER;
 687                 }
 688                 if (lp_posix_pathnames()) {
 689                         ret = SMB_VFS_NEXT_LSTAT(handle, fname, &sbuf);
 690                 } else {
 691                         ret = SMB_VFS_NEXT_STAT(handle, fname, &sbuf);
 692                 }
 693         }
 694
 695         if (ret == -1) {
 696                 return map_nt_error_from_unix(errno);
 697         }
 698
 699         state.streams = NULL;
 700         state.num_streams = 0;
 701
 702         if (!S_ISDIR(sbuf.st_mode)) {
 703                 if (!add_one_stream(mem_ctx,
 704                                     &state.num_streams, &state.streams,
 705                                     "::$DATA", sbuf.st_size,
 706                                     get_allocation_size(handle->conn, fsp,
 707                                                         &sbuf))) {
 708                         return NT_STATUS_NO_MEMORY;
 709                 }
 710         }
 711
 712         state.mem_ctx = mem_ctx;
 713         state.handle = handle;
 714         state.status = NT_STATUS_OK;
 715
 716         status = walk_streams(handle, fname, &sbuf, NULL, collect_one_stream,
 717                               &state);
 718
 719         if (!NT_STATUS_IS_OK(status)) {
 720                 TALLOC_FREE(state.streams);
 721                 return status;
 722         }
 723
 724         if (!NT_STATUS_IS_OK(state.status)) {
 725                 TALLOC_FREE(state.streams);
 726                 return state.status;
 727         }
 728
 729         *pnum_streams = state.num_streams;
 730         *pstreams = state.streams;
 731         return NT_STATUS_OK;
 732 }
 733
 734 static uint32_t streams_depot_fs_capabilities(struct vfs_handle_struct *handle)
 735 {
 736         return SMB_VFS_NEXT_FS_CAPABILITIES(handle) | FILE_NAMED_STREAMS;
 737 }
 738
 739 /* VFS operations structure */
 740
 741 static vfs_op_tuple streams_depot_ops[] = {
 742         {SMB_VFS_OP(streams_depot_fs_capabilities), SMB_VFS_OP_FS_CAPABILITIES,
 743          SMB_VFS_LAYER_TRANSPARENT},
 744         {SMB_VFS_OP(streams_depot_open), SMB_VFS_OP_OPEN,
 745          SMB_VFS_LAYER_TRANSPARENT},
 746         {SMB_VFS_OP(streams_depot_stat), SMB_VFS_OP_STAT,
 747          SMB_VFS_LAYER_TRANSPARENT},
 748         {SMB_VFS_OP(streams_depot_lstat), SMB_VFS_OP_LSTAT,
 749          SMB_VFS_LAYER_TRANSPARENT},
 750         {SMB_VFS_OP(streams_depot_unlink), SMB_VFS_OP_UNLINK,
 751          SMB_VFS_LAYER_TRANSPARENT},
 752         {SMB_VFS_OP(streams_depot_rename), SMB_VFS_OP_RENAME,
 753          SMB_VFS_LAYER_TRANSPARENT},
 754         {SMB_VFS_OP(streams_depot_streaminfo), SMB_VFS_OP_STREAMINFO,
 755          SMB_VFS_LAYER_OPAQUE},
 756         {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
 757 };
 758
 759 NTSTATUS vfs_streams_depot_init(void);
 760 NTSTATUS vfs_streams_depot_init(void)
 761 {
 762         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_depot",
 763                                 streams_depot_ops);
 764 }