source/modules/vfs_streams_xattr.c

   1 /*
   2  * Store streams in xattrs
   3  *
   4  * Copyright (C) Volker Lendecke, 2008
   5  *
   6  * Partly based on James Peach's Darwin module, which is
   7  *
   8  * Copyright (C) James Peach 2006-2007
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 3 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include "includes.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_VFS
  28
  29 struct stream_io {
  30         char *base;
  31         char *xattr_name;
  32 };
  33
  34 static SMB_INO_T stream_inode(const SMB_STRUCT_STAT *sbuf, const char *sname)
  35 {
  36         struct MD5Context ctx;
  37         unsigned char hash[16];
  38         SMB_INO_T result;
  39         char *upper_sname;
  40
  41         DEBUG(10, ("stream_inode called for %lu/%lu [%s]\n",
  42                    (unsigned long)sbuf->st_dev,
  43                    (unsigned long)sbuf->st_ino, sname));
  44
  45         upper_sname = talloc_strdup_upper(talloc_tos(), sname);
  46         SMB_ASSERT(upper_sname != NULL);
  47
  48         MD5Init(&ctx);
  49         MD5Update(&ctx, (unsigned char *)&(sbuf->st_dev),
  50                   sizeof(sbuf->st_dev));
  51         MD5Update(&ctx, (unsigned char *)&(sbuf->st_ino),
  52                   sizeof(sbuf->st_ino));
  53         MD5Update(&ctx, (unsigned char *)upper_sname,
  54                   talloc_get_size(upper_sname)-1);
  55         MD5Final(hash, &ctx);
  56
  57         TALLOC_FREE(upper_sname);
  58
  59         /* Hopefully all the variation is in the lower 4 (or 8) bytes! */
  60         memcpy(&result, hash, sizeof(result));
  61
  62         DEBUG(10, ("stream_inode returns %lu\n", (unsigned long)result));
  63
  64         return result;
  65 }
  66
  67 static ssize_t get_xattr_size(connection_struct *conn,
  68                                 files_struct *fsp,
  69                                 const char *fname,
  70                                 const char *xattr_name)
  71 {
  72         NTSTATUS status;
  73         struct ea_struct ea;
  74         ssize_t result;
  75
  76         status = get_ea_value(talloc_tos(), conn, fsp, fname,
  77                               xattr_name, &ea);
  78
  79         if (!NT_STATUS_IS_OK(status)) {
  80                 return -1;
  81         }
  82
  83         result = ea.value.length-1;
  84         TALLOC_FREE(ea.value.data);
  85         return result;
  86 }
  87
  88
  89 static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
  90                                SMB_STRUCT_STAT *sbuf)
  91 {
  92         struct stream_io *io = (struct stream_io *)
  93                 VFS_FETCH_FSP_EXTENSION(handle, fsp);
  94
  95         DEBUG(10, ("streams_xattr_fstat called for %d\n", fsp->fh->fd));
  96
  97         if (io == NULL) {
  98                 return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
  99         }
 100
 101         if (SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf) == -1) {
 102                 return -1;
 103         }
 104
 105         sbuf->st_size = get_xattr_size(handle->conn, fsp->base_fsp,
 106                                         io->base, io->xattr_name);
 107         if (sbuf->st_size == -1) {
 108                 return -1;
 109         }
 110
 111         DEBUG(10, ("sbuf->st_size = %d\n", (int)sbuf->st_size));
 112
 113         sbuf->st_ino = stream_inode(sbuf, io->xattr_name);
 114         sbuf->st_mode &= ~S_IFMT;
 115         sbuf->st_mode |= S_IFREG;
 116         sbuf->st_blocks = sbuf->st_size % STAT_ST_BLOCKSIZE + 1;
 117
 118         return 0;
 119 }
 120
 121 static int streams_xattr_stat(vfs_handle_struct *handle, const char *fname,
 122                               SMB_STRUCT_STAT *sbuf)
 123 {
 124         NTSTATUS status;
 125         char *base = NULL, *sname = NULL;
 126         int result = -1;
 127         char *xattr_name;
 128
 129         if (!is_ntfs_stream_name(fname)) {
 130                 return SMB_VFS_NEXT_STAT(handle, fname, sbuf);
 131         }
 132
 133         status = split_ntfs_stream_name(talloc_tos(), fname, &base, &sname);
 134         if (!NT_STATUS_IS_OK(status)) {
 135                 errno = EINVAL;
 136                 return -1;
 137         }
 138
 139         if (SMB_VFS_STAT(handle->conn, base, sbuf) == -1) {
 140                 goto fail;
 141         }
 142
 143         xattr_name = talloc_asprintf(talloc_tos(), "%s%s",
 144                                      SAMBA_XATTR_DOSSTREAM_PREFIX, sname);
 145         if (xattr_name == NULL) {
 146                 errno = ENOMEM;
 147                 goto fail;
 148         }
 149
 150         sbuf->st_size = get_xattr_size(handle->conn, NULL, base, xattr_name);
 151         if (sbuf->st_size == -1) {
 152                 errno = ENOENT;
 153                 goto fail;
 154         }
 155
 156         sbuf->st_ino = stream_inode(sbuf, xattr_name);
 157         sbuf->st_mode &= ~S_IFMT;
 158         sbuf->st_mode |= S_IFREG;
 159         sbuf->st_blocks = sbuf->st_size % STAT_ST_BLOCKSIZE + 1;
 160
 161         result = 0;
 162  fail:
 163         TALLOC_FREE(base);
 164         TALLOC_FREE(sname);
 165         return result;
 166 }
 167
 168 static int streams_xattr_lstat(vfs_handle_struct *handle, const char *fname,
 169                                SMB_STRUCT_STAT *sbuf)
 170 {
 171         NTSTATUS status;
 172         char *base, *sname;
 173         int result = -1;
 174         char *xattr_name;
 175
 176         if (!is_ntfs_stream_name(fname)) {
 177                 return SMB_VFS_NEXT_LSTAT(handle, fname, sbuf);
 178         }
 179
 180         status = split_ntfs_stream_name(talloc_tos(), fname, &base, &sname);
 181         if (!NT_STATUS_IS_OK(status)) {
 182                 errno = EINVAL;
 183                 goto fail;
 184         }
 185
 186         if (SMB_VFS_LSTAT(handle->conn, base, sbuf) == -1) {
 187                 goto fail;
 188         }
 189
 190         xattr_name = talloc_asprintf(talloc_tos(), "%s%s",
 191                                      SAMBA_XATTR_DOSSTREAM_PREFIX, sname);
 192         if (xattr_name == NULL) {
 193                 errno = ENOMEM;
 194                 goto fail;
 195         }
 196
 197         sbuf->st_size = get_xattr_size(handle->conn, NULL, base, xattr_name);
 198         if (sbuf->st_size == -1) {
 199                 errno = ENOENT;
 200                 goto fail;
 201         }
 202
 203         sbuf->st_ino = stream_inode(sbuf, xattr_name);
 204         sbuf->st_mode &= ~S_IFMT;
 205         sbuf->st_mode |= S_IFREG;
 206         sbuf->st_blocks = sbuf->st_size % STAT_ST_BLOCKSIZE + 1;
 207
 208         result = 0;
 209  fail:
 210         TALLOC_FREE(base);
 211         TALLOC_FREE(sname);
 212         return result;
 213 }
 214
 215 static int streams_xattr_open(vfs_handle_struct *handle,  const char *fname,
 216                               files_struct *fsp, int flags, mode_t mode)
 217 {
 218         TALLOC_CTX *frame;
 219         NTSTATUS status;
 220         struct stream_io *sio;
 221         char *base, *sname;
 222         struct ea_struct ea;
 223         char *xattr_name;
 224         int baseflags;
 225         int hostfd = -1;
 226
 227         DEBUG(10, ("streams_xattr_open called for %s\n", fname));
 228
 229         if (!is_ntfs_stream_name(fname)) {
 230                 return SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
 231         }
 232
 233         frame = talloc_stackframe();
 234
 235         status = split_ntfs_stream_name(talloc_tos(), fname,
 236                                         &base, &sname);
 237         if (!NT_STATUS_IS_OK(status)) {
 238                 errno = EINVAL;
 239                 goto fail;
 240         }
 241
 242         xattr_name = talloc_asprintf(talloc_tos(), "%s%s",
 243                                      SAMBA_XATTR_DOSSTREAM_PREFIX, sname);
 244         if (xattr_name == NULL) {
 245                 errno = ENOMEM;
 246                 goto fail;
 247         }
 248
 249         /*
 250          * We use baseflags to turn off nasty side-effects when opening the
 251          * underlying file.
 252          */
 253         baseflags = flags;
 254         baseflags &= ~O_TRUNC;
 255         baseflags &= ~O_EXCL;
 256         baseflags &= ~O_CREAT;
 257
 258         hostfd = SMB_VFS_OPEN(handle->conn, base, fsp, baseflags, mode);
 259
 260         /* It is legit to open a stream on a directory, but the base
 261          * fd has to be read-only.
 262          */
 263         if ((hostfd == -1) && (errno == EISDIR)) {
 264                 baseflags &= ~O_ACCMODE;
 265                 baseflags |= O_RDONLY;
 266                 hostfd = SMB_VFS_OPEN(handle->conn, fname, fsp, baseflags,
 267                                       mode);
 268         }
 269
 270         if (hostfd == -1) {
 271                 goto fail;
 272         }
 273
 274         status = get_ea_value(talloc_tos(), handle->conn, NULL, base,
 275                               xattr_name, &ea);
 276
 277         DEBUG(10, ("get_ea_value returned %s\n", nt_errstr(status)));
 278
 279         if (!NT_STATUS_IS_OK(status)
 280             && !NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 281                 /*
 282                  * The base file is not there. This is an error even if we got
 283                  * O_CREAT, the higher levels should have created the base
 284                  * file for us.
 285                  */
 286                 DEBUG(10, ("streams_xattr_open: base file %s not around, "
 287                            "returning ENOENT\n", base));
 288                 errno = ENOENT;
 289                 goto fail;
 290         }
 291
 292         if (!NT_STATUS_IS_OK(status)) {
 293                 /*
 294                  * The attribute does not exist
 295                  */
 296
 297                 if (flags & O_CREAT) {
 298                         /*
 299                          * Darn, xattrs need at least 1 byte
 300                          */
 301                         char null = '\0';
 302
 303                         DEBUG(10, ("creating attribute %s on file %s\n",
 304                                    xattr_name, base));
 305
 306                         if (fsp->base_fsp->fh->fd != -1) {
 307                                 if (SMB_VFS_FSETXATTR(
 308                                         fsp->base_fsp, xattr_name,
 309                                         &null, sizeof(null),
 310                                         flags & O_EXCL ? XATTR_CREATE : 0) == -1) {
 311                                         goto fail;
 312                                 }
 313                         } else {
 314                                 if (SMB_VFS_SETXATTR(
 315                                         handle->conn, base, xattr_name,
 316                                         &null, sizeof(null),
 317                                         flags & O_EXCL ? XATTR_CREATE : 0) == -1) {
 318                                         goto fail;
 319                                 }
 320                         }
 321                 }
 322         }
 323
 324         if (flags & O_TRUNC) {
 325                 char null = '\0';
 326                 if (fsp->base_fsp->fh->fd != -1) {
 327                         if (SMB_VFS_FSETXATTR(
 328                                         fsp->base_fsp, xattr_name,
 329                                         &null, sizeof(null),
 330                                         flags & O_EXCL ? XATTR_CREATE : 0) == -1) {
 331                                 goto fail;
 332                         }
 333                 } else {
 334                         if (SMB_VFS_SETXATTR(
 335                                         handle->conn, base, xattr_name,
 336                                         &null, sizeof(null),
 337                                         flags & O_EXCL ? XATTR_CREATE : 0) == -1) {
 338                                 goto fail;
 339                         }
 340                 }
 341         }
 342
 343         sio = (struct stream_io *)VFS_ADD_FSP_EXTENSION(handle, fsp,
 344                                                         struct stream_io);
 345         if (sio == NULL) {
 346                 errno = ENOMEM;
 347                 goto fail;
 348         }
 349
 350         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 351                                         xattr_name);
 352         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 353                                   base);
 354
 355         if ((sio->xattr_name == NULL) || (sio->base == NULL)) {
 356                 errno = ENOMEM;
 357                 goto fail;
 358         }
 359
 360         TALLOC_FREE(frame);
 361         return hostfd;
 362
 363  fail:
 364         if (hostfd >= 0) {
 365                 /*
 366                  * BUGBUGBUG -- we would need to call fd_close_posix here, but
 367                  * we don't have a full fsp yet
 368                  */
 369                 SMB_VFS_CLOSE(fsp);
 370         }
 371
 372         TALLOC_FREE(frame);
 373         return -1;
 374 }
 375
 376 static int streams_xattr_unlink(vfs_handle_struct *handle,  const char *fname)
 377 {
 378         NTSTATUS status;
 379         char *base = NULL;
 380         char *sname = NULL;
 381         int ret = -1;
 382         char *xattr_name;
 383
 384         if (!is_ntfs_stream_name(fname)) {
 385                 return SMB_VFS_NEXT_UNLINK(handle, fname);
 386         }
 387
 388         status = split_ntfs_stream_name(talloc_tos(), fname, &base, &sname);
 389         if (!NT_STATUS_IS_OK(status)) {
 390                 errno = EINVAL;
 391                 goto fail;
 392         }
 393
 394         xattr_name = talloc_asprintf(talloc_tos(), "%s%s",
 395                                      SAMBA_XATTR_DOSSTREAM_PREFIX, sname);
 396         if (xattr_name == NULL) {
 397                 errno = ENOMEM;
 398                 goto fail;
 399         }
 400
 401         ret = SMB_VFS_REMOVEXATTR(handle->conn, base, xattr_name);
 402
 403         if ((ret == -1) && (errno == ENOATTR)) {
 404                 errno = ENOENT;
 405                 goto fail;
 406         }
 407
 408         ret = 0;
 409
 410  fail:
 411         TALLOC_FREE(base);
 412         TALLOC_FREE(sname);
 413         return ret;
 414 }
 415
 416 static NTSTATUS walk_xattr_streams(connection_struct *conn, files_struct *fsp,
 417                                    const char *fname,
 418                                    bool (*fn)(struct ea_struct *ea,
 419                                               void *private_data),
 420                                    void *private_data)
 421 {
 422         NTSTATUS status;
 423         char **names;
 424         size_t i, num_names;
 425         size_t prefix_len = strlen(SAMBA_XATTR_DOSSTREAM_PREFIX);
 426
 427         status = get_ea_names_from_file(talloc_tos(), conn, fsp, fname,
 428                                         &names, &num_names);
 429         if (!NT_STATUS_IS_OK(status)) {
 430                 return status;
 431         }
 432
 433         for (i=0; i<num_names; i++) {
 434                 struct ea_struct ea;
 435
 436                 if (strncmp(names[i], SAMBA_XATTR_DOSSTREAM_PREFIX,
 437                             prefix_len) != 0) {
 438                         continue;
 439                 }
 440
 441                 status = get_ea_value(names, conn, fsp, fname, names[i], &ea);
 442                 if (!NT_STATUS_IS_OK(status)) {
 443                         DEBUG(10, ("Could not get ea %s for file %s: %s\n",
 444                                    names[i], fname, nt_errstr(status)));
 445                         continue;
 446                 }
 447
 448                 ea.name = talloc_asprintf(ea.value.data, ":%s",
 449                                           names[i] + prefix_len);
 450                 if (ea.name == NULL) {
 451                         DEBUG(0, ("talloc failed\n"));
 452                         continue;
 453                 }
 454
 455                 if (!fn(&ea, private_data)) {
 456                         TALLOC_FREE(ea.value.data);
 457                         return NT_STATUS_OK;
 458                 }
 459
 460                 TALLOC_FREE(ea.value.data);
 461         }
 462
 463         TALLOC_FREE(names);
 464         return NT_STATUS_OK;
 465 }
 466
 467 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 468                            struct stream_struct **streams,
 469                            const char *name, SMB_OFF_T size,
 470                            SMB_OFF_T alloc_size)
 471 {
 472         struct stream_struct *tmp;
 473
 474         tmp = TALLOC_REALLOC_ARRAY(mem_ctx, *streams, struct stream_struct,
 475                                    (*num_streams)+1);
 476         if (tmp == NULL) {
 477                 return false;
 478         }
 479
 480         tmp[*num_streams].name = talloc_strdup(tmp, name);
 481         if (tmp[*num_streams].name == NULL) {
 482                 return false;
 483         }
 484
 485         tmp[*num_streams].size = size;
 486         tmp[*num_streams].alloc_size = alloc_size;
 487
 488         *streams = tmp;
 489         *num_streams += 1;
 490         return true;
 491 }
 492
 493 struct streaminfo_state {
 494         TALLOC_CTX *mem_ctx;
 495         vfs_handle_struct *handle;
 496         unsigned int num_streams;
 497         struct stream_struct *streams;
 498         NTSTATUS status;
 499 };
 500
 501 static bool collect_one_stream(struct ea_struct *ea, void *private_data)
 502 {
 503         struct streaminfo_state *state =
 504                 (struct streaminfo_state *)private_data;
 505
 506         if (!add_one_stream(state->mem_ctx,
 507                             &state->num_streams, &state->streams,
 508                             ea->name, ea->value.length-1,
 509                             smb_roundup(state->handle->conn,
 510                                         ea->value.length-1))) {
 511                 state->status = NT_STATUS_NO_MEMORY;
 512                 return false;
 513         }
 514
 515         return true;
 516 }
 517
 518 static NTSTATUS streams_xattr_streaminfo(vfs_handle_struct *handle,
 519                                          struct files_struct *fsp,
 520                                          const char *fname,
 521                                          TALLOC_CTX *mem_ctx,
 522                                          unsigned int *pnum_streams,
 523                                          struct stream_struct **pstreams)
 524 {
 525         SMB_STRUCT_STAT sbuf;
 526         int ret;
 527         NTSTATUS status;
 528         struct streaminfo_state state;
 529
 530         if ((fsp != NULL) && (fsp->fh->fd != -1)) {
 531                 if (is_ntfs_stream_name(fsp->fsp_name)) {
 532                         return NT_STATUS_INVALID_PARAMETER;
 533                 }
 534                 ret = SMB_VFS_FSTAT(fsp, &sbuf);
 535         }
 536         else {
 537                 if (is_ntfs_stream_name(fname)) {
 538                         return NT_STATUS_INVALID_PARAMETER;
 539                 }
 540                 ret = SMB_VFS_STAT(handle->conn, fname, &sbuf);
 541         }
 542
 543         if (ret == -1) {
 544                 return map_nt_error_from_unix(errno);
 545         }
 546
 547         state.streams = NULL;
 548         state.num_streams = 0;
 549
 550         if (!S_ISDIR(sbuf.st_mode)) {
 551                 if (!add_one_stream(mem_ctx,
 552                                     &state.num_streams, &state.streams,
 553                                     "::$DATA", sbuf.st_size,
 554                                     get_allocation_size(handle->conn, fsp,
 555                                                         &sbuf))) {
 556                         return NT_STATUS_NO_MEMORY;
 557                 }
 558         }
 559
 560         state.mem_ctx = mem_ctx;
 561         state.handle = handle;
 562         state.status = NT_STATUS_OK;
 563
 564         status = walk_xattr_streams(handle->conn, fsp, fname,
 565                                     collect_one_stream, &state);
 566
 567         if (!NT_STATUS_IS_OK(status)) {
 568                 TALLOC_FREE(state.streams);
 569                 return status;
 570         }
 571
 572         if (!NT_STATUS_IS_OK(state.status)) {
 573                 TALLOC_FREE(state.streams);
 574                 return state.status;
 575         }
 576
 577         *pnum_streams = state.num_streams;
 578         *pstreams = state.streams;
 579         return NT_STATUS_OK;
 580 }
 581
 582 static uint32_t streams_xattr_fs_capabilities(struct vfs_handle_struct *handle)
 583 {
 584         return SMB_VFS_NEXT_FS_CAPABILITIES(handle) | FILE_NAMED_STREAMS;
 585 }
 586
 587 static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
 588                                     files_struct *fsp, const void *data,
 589                                     size_t n, SMB_OFF_T offset)
 590 {
 591         struct stream_io *sio =
 592                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 593         struct ea_struct ea;
 594         NTSTATUS status;
 595         int ret;
 596
 597         DEBUG(10, ("streams_xattr_pwrite called for %d bytes\n", (int)n));
 598
 599         if (sio == NULL) {
 600                 return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
 601         }
 602
 603         status = get_ea_value(talloc_tos(), handle->conn, fsp->base_fsp,
 604                               sio->base, sio->xattr_name, &ea);
 605         if (!NT_STATUS_IS_OK(status)) {
 606                 return -1;
 607         }
 608
 609         if ((offset + n) > ea.value.length-1) {
 610                 uint8 *tmp;
 611
 612                 tmp = TALLOC_REALLOC_ARRAY(talloc_tos(), ea.value.data, uint8,
 613                                            offset + n + 1);
 614
 615                 if (tmp == NULL) {
 616                         TALLOC_FREE(ea.value.data);
 617                         errno = ENOMEM;
 618                         return -1;
 619                 }
 620                 ea.value.data = tmp;
 621                 ea.value.length = offset + n + 1;
 622                 ea.value.data[offset+n] = 0;
 623         }
 624
 625         memcpy(ea.value.data + offset, data, n);
 626
 627         if (fsp->base_fsp->fh->fd != -1) {
 628                 ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
 629                                 sio->xattr_name,
 630                                 ea.value.data, ea.value.length, 0);
 631         } else {
 632                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->base_fsp->fsp_name,
 633                                 sio->xattr_name,
 634                                 ea.value.data, ea.value.length, 0);
 635         }
 636         TALLOC_FREE(ea.value.data);
 637
 638         if (ret == -1) {
 639                 return -1;
 640         }
 641
 642         return n;
 643 }
 644
 645 static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
 646                                    files_struct *fsp, void *data,
 647                                    size_t n, SMB_OFF_T offset)
 648 {
 649         struct stream_io *sio =
 650                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 651         struct ea_struct ea;
 652         NTSTATUS status;
 653         size_t length, overlap;
 654
 655         if (sio == NULL) {
 656                 return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
 657         }
 658
 659         status = get_ea_value(talloc_tos(), handle->conn, fsp->base_fsp,
 660                               sio->base, sio->xattr_name, &ea);
 661         if (!NT_STATUS_IS_OK(status)) {
 662                 return -1;
 663         }
 664
 665         length = ea.value.length-1;
 666
 667         /* Attempt to read past EOF. */
 668         if (length <= offset) {
 669                 errno = EINVAL;
 670                 return -1;
 671         }
 672
 673         overlap = (offset + n) > length ? (length - offset) : n;
 674         memcpy(data, ea.value.data + offset, overlap);
 675
 676         TALLOC_FREE(ea.value.data);
 677         return overlap;
 678 }
 679
 680 static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
 681                                         struct files_struct *fsp,
 682                                         SMB_OFF_T offset)
 683 {
 684         int ret;
 685         uint8 *tmp;
 686         struct ea_struct ea;
 687         NTSTATUS status;
 688         struct stream_io *sio =
 689                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 690
 691         DEBUG(10, ("streams_xattr_ftruncate called for file %s offset %.0f\n",
 692                 fsp->fsp_name,
 693                 (double)offset ));
 694
 695         if (sio == NULL) {
 696                 return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
 697         }
 698
 699         status = get_ea_value(talloc_tos(), handle->conn, fsp->base_fsp,
 700                               sio->base, sio->xattr_name, &ea);
 701         if (!NT_STATUS_IS_OK(status)) {
 702                 return -1;
 703         }
 704
 705         tmp = TALLOC_REALLOC_ARRAY(talloc_tos(), ea.value.data, uint8,
 706                                    offset + 1);
 707
 708         if (tmp == NULL) {
 709                 TALLOC_FREE(ea.value.data);
 710                 errno = ENOMEM;
 711                 return -1;
 712         }
 713
 714         /* Did we expand ? */
 715         if (ea.value.length < offset + 1) {
 716                 memset(&tmp[ea.value.length], '\0',
 717                         offset + 1 - ea.value.length);
 718         }
 719
 720         ea.value.data = tmp;
 721         ea.value.length = offset + 1;
 722         ea.value.data[offset] = 0;
 723
 724         if (fsp->base_fsp->fh->fd != -1) {
 725                 ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
 726                                 sio->xattr_name,
 727                                 ea.value.data, ea.value.length, 0);
 728         } else {
 729                 ret = SMB_VFS_SETXATTR(fsp->conn, fsp->base_fsp->fsp_name,
 730                                 sio->xattr_name,
 731                                 ea.value.data, ea.value.length, 0);
 732         }
 733
 734         TALLOC_FREE(ea.value.data);
 735
 736         if (ret == -1) {
 737                 return -1;
 738         }
 739
 740         return 0;
 741 }
 742
 743 /* VFS operations structure */
 744
 745 static vfs_op_tuple streams_xattr_ops[] = {
 746         {SMB_VFS_OP(streams_xattr_fs_capabilities), SMB_VFS_OP_FS_CAPABILITIES,
 747          SMB_VFS_LAYER_TRANSPARENT},
 748         {SMB_VFS_OP(streams_xattr_open), SMB_VFS_OP_OPEN,
 749          SMB_VFS_LAYER_TRANSPARENT},
 750         {SMB_VFS_OP(streams_xattr_stat), SMB_VFS_OP_STAT,
 751          SMB_VFS_LAYER_TRANSPARENT},
 752         {SMB_VFS_OP(streams_xattr_fstat), SMB_VFS_OP_FSTAT,
 753          SMB_VFS_LAYER_TRANSPARENT},
 754         {SMB_VFS_OP(streams_xattr_lstat), SMB_VFS_OP_LSTAT,
 755          SMB_VFS_LAYER_TRANSPARENT},
 756         {SMB_VFS_OP(streams_xattr_pread), SMB_VFS_OP_PREAD,
 757          SMB_VFS_LAYER_TRANSPARENT},
 758         {SMB_VFS_OP(streams_xattr_pwrite), SMB_VFS_OP_PWRITE,
 759          SMB_VFS_LAYER_TRANSPARENT},
 760         {SMB_VFS_OP(streams_xattr_lstat), SMB_VFS_OP_LSTAT,
 761          SMB_VFS_LAYER_TRANSPARENT},
 762         {SMB_VFS_OP(streams_xattr_unlink), SMB_VFS_OP_UNLINK,
 763          SMB_VFS_LAYER_TRANSPARENT},
 764         {SMB_VFS_OP(streams_xattr_ftruncate),  SMB_VFS_OP_FTRUNCATE,
 765          SMB_VFS_LAYER_TRANSPARENT},
 766         {SMB_VFS_OP(streams_xattr_streaminfo), SMB_VFS_OP_STREAMINFO,
 767          SMB_VFS_LAYER_OPAQUE},
 768         {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
 769 };
 770
 771 NTSTATUS vfs_streams_xattr_init(void);
 772 NTSTATUS vfs_streams_xattr_init(void)
 773 {
 774         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
 775                                 streams_xattr_ops);
 776 }