source3/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 #include "smbd/smbd.h"
  26 #include "system/filesys.h"
  27 #include "lib/util/tevent_unix.h"
  28 #include "librpc/gen_ndr/ioctl.h"
  29 #include "hash_inode.h"
  30
  31 #undef DBGC_CLASS
  32 #define DBGC_CLASS DBGC_VFS
  33
  34 struct streams_xattr_config {
  35         const char *prefix;
  36         size_t prefix_len;
  37         bool store_stream_type;
  38 };
  39
  40 struct stream_io {
  41         char *base;
  42         char *xattr_name;
  43         void *fsp_name_ptr;
  44         files_struct *fsp;
  45         vfs_handle_struct *handle;
  46 };
  47
  48 static ssize_t get_xattr_size(connection_struct *conn,
  49                                 const struct smb_filename *smb_fname,
  50                                 const char *xattr_name)
  51 {
  52         NTSTATUS status;
  53         struct ea_struct ea;
  54         ssize_t result;
  55
  56         status = get_ea_value(talloc_tos(), conn, NULL, smb_fname,
  57                               xattr_name, &ea);
  58
  59         if (!NT_STATUS_IS_OK(status)) {
  60                 return -1;
  61         }
  62
  63         result = ea.value.length-1;
  64         TALLOC_FREE(ea.value.data);
  65         return result;
  66 }
  67
  68 /**
  69  * Given a stream name, populate xattr_name with the xattr name to use for
  70  * accessing the stream.
  71  */
  72 static NTSTATUS streams_xattr_get_name(vfs_handle_struct *handle,
  73                                        TALLOC_CTX *ctx,
  74                                        const char *stream_name,
  75                                        char **xattr_name)
  76 {
  77         char *sname;
  78         char *stype;
  79         struct streams_xattr_config *config;
  80
  81         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
  82                                 return NT_STATUS_UNSUCCESSFUL);
  83
  84         sname = talloc_strdup(ctx, stream_name + 1);
  85         if (sname == NULL) {
  86                 return NT_STATUS_NO_MEMORY;
  87         }
  88
  89         /*
  90          * With vfs_fruit option "fruit:encoding = native" we're
  91          * already converting stream names that contain illegal NTFS
  92          * characters from their on-the-wire Unicode Private Range
  93          * encoding to their native ASCII representation.
  94          *
  95          * As as result the name of xattrs storing the streams (via
  96          * vfs_streams_xattr) may contain a colon, so we have to use
  97          * strrchr_m() instead of strchr_m() for matching the stream
  98          * type suffix.
  99          *
 100          * In check_path_syntax() we've already ensured the streamname
 101          * we got from the client is valid.
 102          */
 103         stype = strrchr_m(sname, ':');
 104
 105         if (stype) {
 106                 /*
 107                  * We only support one stream type: "$DATA"
 108                  */
 109                 if (strcasecmp_m(stype, ":$DATA") != 0) {
 110                         talloc_free(sname);
 111                         return NT_STATUS_INVALID_PARAMETER;
 112                 }
 113
 114                 /* Split name and type */
 115                 stype[0] = '\0';
 116         }
 117
 118         *xattr_name = talloc_asprintf(ctx, "%s%s%s",
 119                                       config->prefix,
 120                                       sname,
 121                                       config->store_stream_type ? ":$DATA" : "");
 122         if (*xattr_name == NULL) {
 123                 talloc_free(sname);
 124                 return NT_STATUS_NO_MEMORY;
 125         }
 126
 127         DEBUG(10, ("xattr_name: %s, stream_name: %s\n", *xattr_name,
 128                    stream_name));
 129
 130         talloc_free(sname);
 131         return NT_STATUS_OK;
 132 }
 133
 134 static bool streams_xattr_recheck(struct stream_io *sio)
 135 {
 136         NTSTATUS status;
 137         char *xattr_name = NULL;
 138
 139         if (sio->fsp->fsp_name == sio->fsp_name_ptr) {
 140                 return true;
 141         }
 142
 143         if (sio->fsp->fsp_name->stream_name == NULL) {
 144                 /* how can this happen */
 145                 errno = EINVAL;
 146                 return false;
 147         }
 148
 149         status = streams_xattr_get_name(sio->handle, talloc_tos(),
 150                                         sio->fsp->fsp_name->stream_name,
 151                                         &xattr_name);
 152         if (!NT_STATUS_IS_OK(status)) {
 153                 return false;
 154         }
 155
 156         TALLOC_FREE(sio->xattr_name);
 157         TALLOC_FREE(sio->base);
 158         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
 159                                         xattr_name);
 160         if (sio->xattr_name == NULL) {
 161                 DBG_DEBUG("sio->xattr_name==NULL\n");
 162                 return false;
 163         }
 164         TALLOC_FREE(xattr_name);
 165
 166         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
 167                                   sio->fsp->fsp_name->base_name);
 168         if (sio->base == NULL) {
 169                 DBG_DEBUG("sio->base==NULL\n");
 170                 return false;
 171         }
 172
 173         sio->fsp_name_ptr = sio->fsp->fsp_name;
 174
 175         return true;
 176 }
 177
 178 /**
 179  * Helper to stat/lstat the base file of an smb_fname.
 180  */
 181 static int streams_xattr_stat_base(vfs_handle_struct *handle,
 182                                    struct smb_filename *smb_fname,
 183                                    bool follow_links)
 184 {
 185         char *tmp_stream_name;
 186         int result;
 187
 188         tmp_stream_name = smb_fname->stream_name;
 189         smb_fname->stream_name = NULL;
 190         if (follow_links) {
 191                 result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 192         } else {
 193                 result = SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 194         }
 195         smb_fname->stream_name = tmp_stream_name;
 196         return result;
 197 }
 198
 199 static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
 200                                SMB_STRUCT_STAT *sbuf)
 201 {
 202         struct smb_filename *smb_fname_base = NULL;
 203         int ret = -1;
 204         struct stream_io *io = (struct stream_io *)
 205                 VFS_FETCH_FSP_EXTENSION(handle, fsp);
 206
 207         if (io == NULL || fsp->base_fsp == NULL) {
 208                 return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
 209         }
 210
 211         DBG_DEBUG("streams_xattr_fstat called for %s\n", fsp_str_dbg(io->fsp));
 212
 213         if (!streams_xattr_recheck(io)) {
 214                 return -1;
 215         }
 216
 217         /* Create an smb_filename with stream_name == NULL. */
 218         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 219                                         io->base,
 220                                         NULL,
 221                                         NULL,
 222                                         fsp->fsp_name->flags);
 223         if (smb_fname_base == NULL) {
 224                 errno = ENOMEM;
 225                 return -1;
 226         }
 227
 228         if (smb_fname_base->flags & SMB_FILENAME_POSIX_PATH) {
 229                 ret = SMB_VFS_LSTAT(handle->conn, smb_fname_base);
 230         } else {
 231                 ret = SMB_VFS_STAT(handle->conn, smb_fname_base);
 232         }
 233         *sbuf = smb_fname_base->st;
 234
 235         if (ret == -1) {
 236                 TALLOC_FREE(smb_fname_base);
 237                 return -1;
 238         }
 239
 240         sbuf->st_ex_size = get_xattr_size(handle->conn,
 241                                         smb_fname_base, io->xattr_name);
 242         if (sbuf->st_ex_size == -1) {
 243                 TALLOC_FREE(smb_fname_base);
 244                 SET_STAT_INVALID(*sbuf);
 245                 return -1;
 246         }
 247
 248         DEBUG(10, ("sbuf->st_ex_size = %d\n", (int)sbuf->st_ex_size));
 249
 250         sbuf->st_ex_ino = hash_inode(sbuf, io->xattr_name);
 251         sbuf->st_ex_mode &= ~S_IFMT;
 252         sbuf->st_ex_mode &= ~S_IFDIR;
 253         sbuf->st_ex_mode |= S_IFREG;
 254         sbuf->st_ex_blocks = sbuf->st_ex_size / STAT_ST_BLOCKSIZE + 1;
 255
 256         TALLOC_FREE(smb_fname_base);
 257         return 0;
 258 }
 259
 260 static int streams_xattr_stat(vfs_handle_struct *handle,
 261                               struct smb_filename *smb_fname)
 262 {
 263         NTSTATUS status;
 264         int result = -1;
 265         char *xattr_name = NULL;
 266
 267         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 268                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 269         }
 270
 271         /* Note if lp_posix_paths() is true, we can never
 272          * get here as is_ntfs_stream_smb_fname() is
 273          * always false. So we never need worry about
 274          * not following links here. */
 275
 276         /* If the default stream is requested, just stat the base file. */
 277         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 278                 return streams_xattr_stat_base(handle, smb_fname, true);
 279         }
 280
 281         /* Populate the stat struct with info from the base file. */
 282         if (streams_xattr_stat_base(handle, smb_fname, true) == -1) {
 283                 return -1;
 284         }
 285
 286         /* Derive the xattr name to lookup. */
 287         status = streams_xattr_get_name(handle, talloc_tos(),
 288                                         smb_fname->stream_name, &xattr_name);
 289         if (!NT_STATUS_IS_OK(status)) {
 290                 errno = map_errno_from_nt_status(status);
 291                 return -1;
 292         }
 293
 294         /* Augment the base file's stat information before returning. */
 295         smb_fname->st.st_ex_size = get_xattr_size(handle->conn,
 296                                                   smb_fname,
 297                                                   xattr_name);
 298         if (smb_fname->st.st_ex_size == -1) {
 299                 SET_STAT_INVALID(smb_fname->st);
 300                 errno = ENOENT;
 301                 result = -1;
 302                 goto fail;
 303         }
 304
 305         smb_fname->st.st_ex_ino = hash_inode(&smb_fname->st, xattr_name);
 306         smb_fname->st.st_ex_mode &= ~S_IFMT;
 307         smb_fname->st.st_ex_mode &= ~S_IFDIR;
 308         smb_fname->st.st_ex_mode |= S_IFREG;
 309         smb_fname->st.st_ex_blocks =
 310             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 311
 312         result = 0;
 313  fail:
 314         TALLOC_FREE(xattr_name);
 315         return result;
 316 }
 317
 318 static int streams_xattr_lstat(vfs_handle_struct *handle,
 319                                struct smb_filename *smb_fname)
 320 {
 321         NTSTATUS status;
 322         int result = -1;
 323         char *xattr_name = NULL;
 324
 325         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 326                 return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 327         }
 328
 329         /* If the default stream is requested, just stat the base file. */
 330         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 331                 return streams_xattr_stat_base(handle, smb_fname, false);
 332         }
 333
 334         /* Populate the stat struct with info from the base file. */
 335         if (streams_xattr_stat_base(handle, smb_fname, false) == -1) {
 336                 return -1;
 337         }
 338
 339         /* Derive the xattr name to lookup. */
 340         status = streams_xattr_get_name(handle, talloc_tos(),
 341                                         smb_fname->stream_name, &xattr_name);
 342         if (!NT_STATUS_IS_OK(status)) {
 343                 errno = map_errno_from_nt_status(status);
 344                 return -1;
 345         }
 346
 347         /* Augment the base file's stat information before returning. */
 348         smb_fname->st.st_ex_size = get_xattr_size(handle->conn,
 349                                                   smb_fname,
 350                                                   xattr_name);
 351         if (smb_fname->st.st_ex_size == -1) {
 352                 SET_STAT_INVALID(smb_fname->st);
 353                 errno = ENOENT;
 354                 result = -1;
 355                 goto fail;
 356         }
 357
 358         smb_fname->st.st_ex_ino = hash_inode(&smb_fname->st, xattr_name);
 359         smb_fname->st.st_ex_mode &= ~S_IFMT;
 360         smb_fname->st.st_ex_mode |= S_IFREG;
 361         smb_fname->st.st_ex_blocks =
 362             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 363
 364         result = 0;
 365
 366  fail:
 367         TALLOC_FREE(xattr_name);
 368         return result;
 369 }
 370
 371 static int streams_xattr_open(vfs_handle_struct *handle,
 372                               struct smb_filename *smb_fname,
 373                               files_struct *fsp, int flags, mode_t mode)
 374 {
 375         NTSTATUS status;
 376         struct streams_xattr_config *config = NULL;
 377         struct stream_io *sio = NULL;
 378         struct ea_struct ea;
 379         char *xattr_name = NULL;
 380         int pipe_fds[2];
 381         int fakefd = -1;
 382         bool set_empty_xattr = false;
 383         int ret;
 384
 385         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 386                                 return -1);
 387
 388         DEBUG(10, ("streams_xattr_open called for %s with flags 0x%x\n",
 389                    smb_fname_str_dbg(smb_fname), flags));
 390
 391         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 392                 return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 393         }
 394
 395         /* If the default stream is requested, just open the base file. */
 396         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 397                 char *tmp_stream_name;
 398
 399                 tmp_stream_name = smb_fname->stream_name;
 400                 smb_fname->stream_name = NULL;
 401
 402                 ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 403
 404                 smb_fname->stream_name = tmp_stream_name;
 405
 406                 return ret;
 407         }
 408
 409         status = streams_xattr_get_name(handle, talloc_tos(),
 410                                         smb_fname->stream_name, &xattr_name);
 411         if (!NT_STATUS_IS_OK(status)) {
 412                 errno = map_errno_from_nt_status(status);
 413                 goto fail;
 414         }
 415
 416         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 417                               smb_fname, xattr_name, &ea);
 418
 419         DEBUG(10, ("get_ea_value returned %s\n", nt_errstr(status)));
 420
 421         if (!NT_STATUS_IS_OK(status)) {
 422                 if (!NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 423                         /*
 424                          * The base file is not there. This is an error even if
 425                          * we got O_CREAT, the higher levels should have created
 426                          * the base file for us.
 427                          */
 428                         DBG_DEBUG("streams_xattr_open: base file %s not around, "
 429                                   "returning ENOENT\n", smb_fname->base_name);
 430                         errno = ENOENT;
 431                         goto fail;
 432                 }
 433
 434                 if (!(flags & O_CREAT)) {
 435                         errno = ENOATTR;
 436                         goto fail;
 437                 }
 438
 439                 set_empty_xattr = true;
 440         }
 441
 442         if (flags & O_TRUNC) {
 443                 set_empty_xattr = true;
 444         }
 445
 446         if (set_empty_xattr) {
 447                 /*
 448                  * The attribute does not exist or needs to be truncated
 449                  */
 450
 451                 /*
 452                  * Darn, xattrs need at least 1 byte
 453                  */
 454                 char null = '\0';
 455
 456                 DEBUG(10, ("creating or truncating attribute %s on file %s\n",
 457                            xattr_name, smb_fname->base_name));
 458
 459                 ret = SMB_VFS_SETXATTR(fsp->conn,
 460                                        smb_fname,
 461                                        xattr_name,
 462                                        &null, sizeof(null),
 463                                        flags & O_EXCL ? XATTR_CREATE : 0);
 464                 if (ret != 0) {
 465                         goto fail;
 466                 }
 467         }
 468
 469         /*
 470          * Return a valid fd, but ensure any attempt to use it returns an error
 471          * (EPIPE).
 472          */
 473         ret = pipe(pipe_fds);
 474         if (ret != 0) {
 475                 goto fail;
 476         }
 477
 478         close(pipe_fds[1]);
 479         pipe_fds[1] = -1;
 480         fakefd = pipe_fds[0];
 481
 482         sio = VFS_ADD_FSP_EXTENSION(handle, fsp, struct stream_io, NULL);
 483         if (sio == NULL) {
 484                 errno = ENOMEM;
 485                 goto fail;
 486         }
 487
 488         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 489                                         xattr_name);
 490         if (sio->xattr_name == NULL) {
 491                 errno = ENOMEM;
 492                 goto fail;
 493         }
 494
 495         /*
 496          * so->base needs to be a copy of fsp->fsp_name->base_name,
 497          * making it identical to streams_xattr_recheck(). If the
 498          * open is changing directories, fsp->fsp_name->base_name
 499          * will be the full path from the share root, whilst
 500          * smb_fname will be relative to the $cwd.
 501          */
 502         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 503                                   fsp->fsp_name->base_name);
 504         if (sio->base == NULL) {
 505                 errno = ENOMEM;
 506                 goto fail;
 507         }
 508
 509         sio->fsp_name_ptr = fsp->fsp_name;
 510         sio->handle = handle;
 511         sio->fsp = fsp;
 512
 513         return fakefd;
 514
 515  fail:
 516         if (fakefd >= 0) {
 517                 close(fakefd);
 518                 fakefd = -1;
 519         }
 520
 521         return -1;
 522 }
 523
 524 static int streams_xattr_close(vfs_handle_struct *handle,
 525                                files_struct *fsp)
 526 {
 527         int ret;
 528         int fd;
 529
 530         fd = fsp->fh->fd;
 531
 532         DBG_DEBUG("streams_xattr_close called [%s] fd [%d]\n",
 533                         smb_fname_str_dbg(fsp->fsp_name), fd);
 534
 535         if (!is_ntfs_stream_smb_fname(fsp->fsp_name)) {
 536                 return SMB_VFS_NEXT_CLOSE(handle, fsp);
 537         }
 538
 539         if (is_ntfs_default_stream_smb_fname(fsp->fsp_name)) {
 540                 return SMB_VFS_NEXT_CLOSE(handle, fsp);
 541         }
 542
 543         ret = close(fd);
 544         fsp->fh->fd = -1;
 545
 546         return ret;
 547 }
 548
 549 static int streams_xattr_unlink(vfs_handle_struct *handle,
 550                                 const struct smb_filename *smb_fname)
 551 {
 552         NTSTATUS status;
 553         int ret = -1;
 554         char *xattr_name = NULL;
 555
 556         if (!is_ntfs_stream_smb_fname(smb_fname)) {
 557                 return SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 558         }
 559
 560         /* If the default stream is requested, just open the base file. */
 561         if (is_ntfs_default_stream_smb_fname(smb_fname)) {
 562                 struct smb_filename *smb_fname_base = NULL;
 563
 564                 smb_fname_base = cp_smb_filename(talloc_tos(), smb_fname);
 565                 if (smb_fname_base == NULL) {
 566                         errno = ENOMEM;
 567                         return -1;
 568                 }
 569
 570                 ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_base);
 571
 572                 TALLOC_FREE(smb_fname_base);
 573                 return ret;
 574         }
 575
 576         status = streams_xattr_get_name(handle, talloc_tos(),
 577                                         smb_fname->stream_name, &xattr_name);
 578         if (!NT_STATUS_IS_OK(status)) {
 579                 errno = map_errno_from_nt_status(status);
 580                 goto fail;
 581         }
 582
 583         ret = SMB_VFS_REMOVEXATTR(handle->conn, smb_fname, xattr_name);
 584
 585         if ((ret == -1) && (errno == ENOATTR)) {
 586                 errno = ENOENT;
 587                 goto fail;
 588         }
 589
 590         ret = 0;
 591
 592  fail:
 593         TALLOC_FREE(xattr_name);
 594         return ret;
 595 }
 596
 597 static int streams_xattr_unlinkat(vfs_handle_struct *handle,
 598                         struct files_struct *dirfsp,
 599                         const struct smb_filename *smb_fname,
 600                         int flags)
 601 {
 602         int ret;
 603         if (flags & AT_REMOVEDIR) {
 604                 ret = SMB_VFS_NEXT_UNLINKAT(handle,
 605                                 dirfsp,
 606                                 smb_fname,
 607                                 flags);
 608         } else {
 609                 ret = streams_xattr_unlink(handle,
 610                                 smb_fname);
 611         }
 612         return ret;
 613 }
 614
 615 static int streams_xattr_renameat(vfs_handle_struct *handle,
 616                                 files_struct *srcfsp,
 617                                 const struct smb_filename *smb_fname_src,
 618                                 files_struct *dstfsp,
 619                                 const struct smb_filename *smb_fname_dst)
 620 {
 621         NTSTATUS status;
 622         int ret = -1;
 623         char *src_xattr_name = NULL;
 624         char *dst_xattr_name = NULL;
 625         bool src_is_stream, dst_is_stream;
 626         ssize_t oret;
 627         ssize_t nret;
 628         struct ea_struct ea;
 629
 630         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 631         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 632
 633         if (!src_is_stream && !dst_is_stream) {
 634                 return SMB_VFS_NEXT_RENAMEAT(handle,
 635                                         srcfsp,
 636                                         smb_fname_src,
 637                                         dstfsp,
 638                                         smb_fname_dst);
 639         }
 640
 641         /* For now don't allow renames from or to the default stream. */
 642         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 643             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 644                 errno = ENOSYS;
 645                 goto done;
 646         }
 647
 648         /* Don't rename if the streams are identical. */
 649         if (strcasecmp_m(smb_fname_src->stream_name,
 650                        smb_fname_dst->stream_name) == 0) {
 651                 goto done;
 652         }
 653
 654         /* Get the xattr names. */
 655         status = streams_xattr_get_name(handle, talloc_tos(),
 656                                         smb_fname_src->stream_name,
 657                                         &src_xattr_name);
 658         if (!NT_STATUS_IS_OK(status)) {
 659                 errno = map_errno_from_nt_status(status);
 660                 goto fail;
 661         }
 662         status = streams_xattr_get_name(handle, talloc_tos(),
 663                                         smb_fname_dst->stream_name,
 664                                         &dst_xattr_name);
 665         if (!NT_STATUS_IS_OK(status)) {
 666                 errno = map_errno_from_nt_status(status);
 667                 goto fail;
 668         }
 669
 670         /* read the old stream */
 671         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 672                               smb_fname_src, src_xattr_name, &ea);
 673         if (!NT_STATUS_IS_OK(status)) {
 674                 errno = ENOENT;
 675                 goto fail;
 676         }
 677
 678         /* (over)write the new stream */
 679         nret = SMB_VFS_SETXATTR(handle->conn, smb_fname_src,
 680                                 dst_xattr_name, ea.value.data, ea.value.length,
 681                                 0);
 682         if (nret < 0) {
 683                 if (errno == ENOATTR) {
 684                         errno = ENOENT;
 685                 }
 686                 goto fail;
 687         }
 688
 689         /* remove the old stream */
 690         oret = SMB_VFS_REMOVEXATTR(handle->conn, smb_fname_src,
 691                                    src_xattr_name);
 692         if (oret < 0) {
 693                 if (errno == ENOATTR) {
 694                         errno = ENOENT;
 695                 }
 696                 goto fail;
 697         }
 698
 699  done:
 700         errno = 0;
 701         ret = 0;
 702  fail:
 703         TALLOC_FREE(src_xattr_name);
 704         TALLOC_FREE(dst_xattr_name);
 705         return ret;
 706 }
 707
 708 static NTSTATUS walk_xattr_streams(vfs_handle_struct *handle,
 709                                 files_struct *fsp,
 710                                 const struct smb_filename *smb_fname,
 711                                 bool (*fn)(struct ea_struct *ea,
 712                                         void *private_data),
 713                                 void *private_data)
 714 {
 715         NTSTATUS status;
 716         char **names;
 717         size_t i, num_names;
 718         struct streams_xattr_config *config;
 719
 720         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 721                                 return NT_STATUS_UNSUCCESSFUL);
 722
 723         status = get_ea_names_from_file(talloc_tos(),
 724                                 handle->conn,
 725                                 fsp,
 726                                 smb_fname,
 727                                 &names,
 728                                 &num_names);
 729         if (!NT_STATUS_IS_OK(status)) {
 730                 return status;
 731         }
 732
 733         for (i=0; i<num_names; i++) {
 734                 struct ea_struct ea;
 735
 736                 /*
 737                  * We want to check with samba_private_attr_name()
 738                  * whether the xattr name is a private one,
 739                  * unfortunately it flags xattrs that begin with the
 740                  * default streams prefix as private.
 741                  *
 742                  * By only calling samba_private_attr_name() in case
 743                  * the xattr does NOT begin with the default prefix,
 744                  * we know that if it returns 'true' it definitely one
 745                  * of our internal xattr like "user.DOSATTRIB".
 746                  */
 747                 if (strncasecmp_m(names[i], SAMBA_XATTR_DOSSTREAM_PREFIX,
 748                                   strlen(SAMBA_XATTR_DOSSTREAM_PREFIX)) != 0) {
 749                         if (samba_private_attr_name(names[i])) {
 750                                 continue;
 751                         }
 752                 }
 753
 754                 if (strncmp(names[i], config->prefix,
 755                             config->prefix_len) != 0) {
 756                         continue;
 757                 }
 758
 759                 status = get_ea_value(names,
 760                                         handle->conn,
 761                                         NULL,
 762                                         smb_fname,
 763                                         names[i],
 764                                         &ea);
 765                 if (!NT_STATUS_IS_OK(status)) {
 766                         DEBUG(10, ("Could not get ea %s for file %s: %s\n",
 767                                 names[i],
 768                                 smb_fname->base_name,
 769                                 nt_errstr(status)));
 770                         continue;
 771                 }
 772
 773                 ea.name = talloc_asprintf(
 774                         ea.value.data, ":%s%s",
 775                         names[i] + config->prefix_len,
 776                         config->store_stream_type ? "" : ":$DATA");
 777                 if (ea.name == NULL) {
 778                         DEBUG(0, ("talloc failed\n"));
 779                         continue;
 780                 }
 781
 782                 if (!fn(&ea, private_data)) {
 783                         TALLOC_FREE(ea.value.data);
 784                         return NT_STATUS_OK;
 785                 }
 786
 787                 TALLOC_FREE(ea.value.data);
 788         }
 789
 790         TALLOC_FREE(names);
 791         return NT_STATUS_OK;
 792 }
 793
 794 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 795                            struct stream_struct **streams,
 796                            const char *name, off_t size,
 797                            off_t alloc_size)
 798 {
 799         struct stream_struct *tmp;
 800
 801         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 802                                    (*num_streams)+1);
 803         if (tmp == NULL) {
 804                 return false;
 805         }
 806
 807         tmp[*num_streams].name = talloc_strdup(tmp, name);
 808         if (tmp[*num_streams].name == NULL) {
 809                 return false;
 810         }
 811
 812         tmp[*num_streams].size = size;
 813         tmp[*num_streams].alloc_size = alloc_size;
 814
 815         *streams = tmp;
 816         *num_streams += 1;
 817         return true;
 818 }
 819
 820 struct streaminfo_state {
 821         TALLOC_CTX *mem_ctx;
 822         vfs_handle_struct *handle;
 823         unsigned int num_streams;
 824         struct stream_struct *streams;
 825         NTSTATUS status;
 826 };
 827
 828 static bool collect_one_stream(struct ea_struct *ea, void *private_data)
 829 {
 830         struct streaminfo_state *state =
 831                 (struct streaminfo_state *)private_data;
 832
 833         if (!add_one_stream(state->mem_ctx,
 834                             &state->num_streams, &state->streams,
 835                             ea->name, ea->value.length-1,
 836                             smb_roundup(state->handle->conn,
 837                                         ea->value.length-1))) {
 838                 state->status = NT_STATUS_NO_MEMORY;
 839                 return false;
 840         }
 841
 842         return true;
 843 }
 844
 845 static NTSTATUS streams_xattr_streaminfo(vfs_handle_struct *handle,
 846                                          struct files_struct *fsp,
 847                                          const struct smb_filename *smb_fname,
 848                                          TALLOC_CTX *mem_ctx,
 849                                          unsigned int *pnum_streams,
 850                                          struct stream_struct **pstreams)
 851 {
 852         SMB_STRUCT_STAT sbuf;
 853         int ret;
 854         NTSTATUS status;
 855         struct streaminfo_state state;
 856
 857         ret = vfs_stat_smb_basename(handle->conn, smb_fname, &sbuf);
 858         if (ret == -1) {
 859                 return map_nt_error_from_unix(errno);
 860         }
 861
 862         state.streams = *pstreams;
 863         state.num_streams = *pnum_streams;
 864         state.mem_ctx = mem_ctx;
 865         state.handle = handle;
 866         state.status = NT_STATUS_OK;
 867
 868         if (S_ISLNK(sbuf.st_ex_mode)) {
 869                 /*
 870                  * Currently we do't have SMB_VFS_LLISTXATTR
 871                  * inside the VFS which means there's no way
 872                  * to cope with a symlink when lp_posix_pathnames().
 873                  * returns true. For now ignore links.
 874                  * FIXME - by adding SMB_VFS_LLISTXATTR. JRA.
 875                  */
 876                 status = NT_STATUS_OK;
 877         } else {
 878                 status = walk_xattr_streams(handle, fsp, smb_fname,
 879                                     collect_one_stream, &state);
 880         }
 881
 882         if (!NT_STATUS_IS_OK(status)) {
 883                 TALLOC_FREE(state.streams);
 884                 return status;
 885         }
 886
 887         if (!NT_STATUS_IS_OK(state.status)) {
 888                 TALLOC_FREE(state.streams);
 889                 return state.status;
 890         }
 891
 892         *pnum_streams = state.num_streams;
 893         *pstreams = state.streams;
 894
 895         return SMB_VFS_NEXT_STREAMINFO(handle,
 896                         fsp,
 897                         smb_fname,
 898                         mem_ctx,
 899                         pnum_streams,
 900                         pstreams);
 901 }
 902
 903 static uint32_t streams_xattr_fs_capabilities(struct vfs_handle_struct *handle,
 904                         enum timestamp_set_resolution *p_ts_res)
 905 {
 906         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 907 }
 908
 909 static int streams_xattr_connect(vfs_handle_struct *handle,
 910                                  const char *service, const char *user)
 911 {
 912         struct streams_xattr_config *config;
 913         const char *default_prefix = SAMBA_XATTR_DOSSTREAM_PREFIX;
 914         const char *prefix;
 915         int rc;
 916
 917         rc = SMB_VFS_NEXT_CONNECT(handle, service, user);
 918         if (rc != 0) {
 919                 return rc;
 920         }
 921
 922         config = talloc_zero(handle->conn, struct streams_xattr_config);
 923         if (config == NULL) {
 924                 DEBUG(1, ("talloc_zero() failed\n"));
 925                 errno = ENOMEM;
 926                 return -1;
 927         }
 928
 929         prefix = lp_parm_const_string(SNUM(handle->conn),
 930                                       "streams_xattr", "prefix",
 931                                       default_prefix);
 932         config->prefix = talloc_strdup(config, prefix);
 933         if (config->prefix == NULL) {
 934                 DEBUG(1, ("talloc_strdup() failed\n"));
 935                 errno = ENOMEM;
 936                 return -1;
 937         }
 938         config->prefix_len = strlen(config->prefix);
 939         DEBUG(10, ("streams_xattr using stream prefix: %s\n", config->prefix));
 940
 941         config->store_stream_type = lp_parm_bool(SNUM(handle->conn),
 942                                                  "streams_xattr",
 943                                                  "store_stream_type",
 944                                                  true);
 945
 946         SMB_VFS_HANDLE_SET_DATA(handle, config,
 947                                 NULL, struct stream_xattr_config,
 948                                 return -1);
 949
 950         return 0;
 951 }
 952
 953 static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
 954                                     files_struct *fsp, const void *data,
 955                                     size_t n, off_t offset)
 956 {
 957         struct stream_io *sio =
 958                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 959         struct ea_struct ea;
 960         NTSTATUS status;
 961         struct smb_filename *smb_fname_base = NULL;
 962         int ret;
 963
 964         DEBUG(10, ("streams_xattr_pwrite called for %d bytes\n", (int)n));
 965
 966         if (sio == NULL) {
 967                 return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
 968         }
 969
 970         if (!streams_xattr_recheck(sio)) {
 971                 return -1;
 972         }
 973
 974         /* Create an smb_filename with stream_name == NULL. */
 975         smb_fname_base = synthetic_smb_fname(talloc_tos(),
 976                                         sio->base,
 977                                         NULL,
 978                                         NULL,
 979                                         fsp->fsp_name->flags);
 980         if (smb_fname_base == NULL) {
 981                 errno = ENOMEM;
 982                 return -1;
 983         }
 984
 985         status = get_ea_value(talloc_tos(), handle->conn, NULL,
 986                               smb_fname_base, sio->xattr_name, &ea);
 987         if (!NT_STATUS_IS_OK(status)) {
 988                 return -1;
 989         }
 990
 991         if ((offset + n) > ea.value.length-1) {
 992                 uint8_t *tmp;
 993
 994                 tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
 995                                            offset + n + 1);
 996
 997                 if (tmp == NULL) {
 998                         TALLOC_FREE(ea.value.data);
 999                         errno = ENOMEM;
1000                         return -1;
1001                 }
1002                 ea.value.data = tmp;
1003                 ea.value.length = offset + n + 1;
1004                 ea.value.data[offset+n] = 0;
1005         }
1006
1007         memcpy(ea.value.data + offset, data, n);
1008
1009         ret = SMB_VFS_SETXATTR(fsp->conn,
1010                                fsp->fsp_name,
1011                                sio->xattr_name,
1012                                ea.value.data, ea.value.length, 0);
1013         TALLOC_FREE(ea.value.data);
1014
1015         if (ret == -1) {
1016                 return -1;
1017         }
1018
1019         return n;
1020 }
1021
1022 static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
1023                                    files_struct *fsp, void *data,
1024                                    size_t n, off_t offset)
1025 {
1026         struct stream_io *sio =
1027                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1028         struct ea_struct ea;
1029         NTSTATUS status;
1030         size_t length, overlap;
1031         struct smb_filename *smb_fname_base = NULL;
1032
1033         DEBUG(10, ("streams_xattr_pread: offset=%d, size=%d\n",
1034                    (int)offset, (int)n));
1035
1036         if (sio == NULL) {
1037                 return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
1038         }
1039
1040         if (!streams_xattr_recheck(sio)) {
1041                 return -1;
1042         }
1043
1044         /* Create an smb_filename with stream_name == NULL. */
1045         smb_fname_base = synthetic_smb_fname(talloc_tos(),
1046                                         sio->base,
1047                                         NULL,
1048                                         NULL,
1049                                         fsp->fsp_name->flags);
1050         if (smb_fname_base == NULL) {
1051                 errno = ENOMEM;
1052                 return -1;
1053         }
1054
1055         status = get_ea_value(talloc_tos(), handle->conn, NULL,
1056                               smb_fname_base, sio->xattr_name, &ea);
1057         if (!NT_STATUS_IS_OK(status)) {
1058                 return -1;
1059         }
1060
1061         length = ea.value.length-1;
1062
1063         DEBUG(10, ("streams_xattr_pread: get_ea_value returned %d bytes\n",
1064                    (int)length));
1065
1066         /* Attempt to read past EOF. */
1067         if (length <= offset) {
1068                 return 0;
1069         }
1070
1071         overlap = (offset + n) > length ? (length - offset) : n;
1072         memcpy(data, ea.value.data + offset, overlap);
1073
1074         TALLOC_FREE(ea.value.data);
1075         return overlap;
1076 }
1077
1078 struct streams_xattr_pread_state {
1079         ssize_t nread;
1080         struct vfs_aio_state vfs_aio_state;
1081 };
1082
1083 static void streams_xattr_pread_done(struct tevent_req *subreq);
1084
1085 static struct tevent_req *streams_xattr_pread_send(
1086         struct vfs_handle_struct *handle,
1087         TALLOC_CTX *mem_ctx,
1088         struct tevent_context *ev,
1089         struct files_struct *fsp,
1090         void *data,
1091         size_t n, off_t offset)
1092 {
1093         struct tevent_req *req = NULL;
1094         struct tevent_req *subreq = NULL;
1095         struct streams_xattr_pread_state *state = NULL;
1096         struct stream_io *sio =
1097                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1098
1099         req = tevent_req_create(mem_ctx, &state,
1100                                 struct streams_xattr_pread_state);
1101         if (req == NULL) {
1102                 return NULL;
1103         }
1104
1105         if (sio == NULL) {
1106                 subreq = SMB_VFS_NEXT_PREAD_SEND(state, ev, handle, fsp,
1107                                                  data, n, offset);
1108                 if (tevent_req_nomem(req, subreq)) {
1109                         return tevent_req_post(req, ev);
1110                 }
1111                 tevent_req_set_callback(subreq, streams_xattr_pread_done, req);
1112                 return req;
1113         }
1114
1115         state->nread = SMB_VFS_PREAD(fsp, data, n, offset);
1116         if (state->nread != n) {
1117                 if (state->nread != -1) {
1118                         errno = EIO;
1119                 }
1120                 tevent_req_error(req, errno);
1121                 return tevent_req_post(req, ev);
1122         }
1123
1124         tevent_req_done(req);
1125         return tevent_req_post(req, ev);
1126 }
1127
1128 static void streams_xattr_pread_done(struct tevent_req *subreq)
1129 {
1130         struct tevent_req *req = tevent_req_callback_data(
1131                 subreq, struct tevent_req);
1132         struct streams_xattr_pread_state *state = tevent_req_data(
1133                 req, struct streams_xattr_pread_state);
1134
1135         state->nread = SMB_VFS_PREAD_RECV(subreq, &state->vfs_aio_state);
1136         TALLOC_FREE(subreq);
1137
1138         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1139                 return;
1140         }
1141         tevent_req_done(req);
1142 }
1143
1144 static ssize_t streams_xattr_pread_recv(struct tevent_req *req,
1145                                         struct vfs_aio_state *vfs_aio_state)
1146 {
1147         struct streams_xattr_pread_state *state = tevent_req_data(
1148                 req, struct streams_xattr_pread_state);
1149
1150         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1151                 return -1;
1152         }
1153
1154         *vfs_aio_state = state->vfs_aio_state;
1155         return state->nread;
1156 }
1157
1158 struct streams_xattr_pwrite_state {
1159         ssize_t nwritten;
1160         struct vfs_aio_state vfs_aio_state;
1161 };
1162
1163 static void streams_xattr_pwrite_done(struct tevent_req *subreq);
1164
1165 static struct tevent_req *streams_xattr_pwrite_send(
1166         struct vfs_handle_struct *handle,
1167         TALLOC_CTX *mem_ctx,
1168         struct tevent_context *ev,
1169         struct files_struct *fsp,
1170         const void *data,
1171         size_t n, off_t offset)
1172 {
1173         struct tevent_req *req = NULL;
1174         struct tevent_req *subreq = NULL;
1175         struct streams_xattr_pwrite_state *state = NULL;
1176         struct stream_io *sio =
1177                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1178
1179         req = tevent_req_create(mem_ctx, &state,
1180                                 struct streams_xattr_pwrite_state);
1181         if (req == NULL) {
1182                 return NULL;
1183         }
1184
1185         if (sio == NULL) {
1186                 subreq = SMB_VFS_NEXT_PWRITE_SEND(state, ev, handle, fsp,
1187                                                   data, n, offset);
1188                 if (tevent_req_nomem(req, subreq)) {
1189                         return tevent_req_post(req, ev);
1190                 }
1191                 tevent_req_set_callback(subreq, streams_xattr_pwrite_done, req);
1192                 return req;
1193         }
1194
1195         state->nwritten = SMB_VFS_PWRITE(fsp, data, n, offset);
1196         if (state->nwritten != n) {
1197                 if (state->nwritten != -1) {
1198                         errno = EIO;
1199                 }
1200                 tevent_req_error(req, errno);
1201                 return tevent_req_post(req, ev);
1202         }
1203
1204         tevent_req_done(req);
1205         return tevent_req_post(req, ev);
1206 }
1207
1208 static void streams_xattr_pwrite_done(struct tevent_req *subreq)
1209 {
1210         struct tevent_req *req = tevent_req_callback_data(
1211                 subreq, struct tevent_req);
1212         struct streams_xattr_pwrite_state *state = tevent_req_data(
1213                 req, struct streams_xattr_pwrite_state);
1214
1215         state->nwritten = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
1216         TALLOC_FREE(subreq);
1217
1218         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1219                 return;
1220         }
1221         tevent_req_done(req);
1222 }
1223
1224 static ssize_t streams_xattr_pwrite_recv(struct tevent_req *req,
1225                                          struct vfs_aio_state *vfs_aio_state)
1226 {
1227         struct streams_xattr_pwrite_state *state = tevent_req_data(
1228                 req, struct streams_xattr_pwrite_state);
1229
1230         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1231                 return -1;
1232         }
1233
1234         *vfs_aio_state = state->vfs_aio_state;
1235         return state->nwritten;
1236 }
1237
1238 static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
1239                                         struct files_struct *fsp,
1240                                         off_t offset)
1241 {
1242         int ret;
1243         uint8_t *tmp;
1244         struct ea_struct ea;
1245         NTSTATUS status;
1246         struct stream_io *sio =
1247                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1248         struct smb_filename *smb_fname_base = NULL;
1249
1250         DEBUG(10, ("streams_xattr_ftruncate called for file %s offset %.0f\n",
1251                    fsp_str_dbg(fsp), (double)offset));
1252
1253         if (sio == NULL) {
1254                 return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
1255         }
1256
1257         if (!streams_xattr_recheck(sio)) {
1258                 return -1;
1259         }
1260
1261         /* Create an smb_filename with stream_name == NULL. */
1262         smb_fname_base = synthetic_smb_fname(talloc_tos(),
1263                                         sio->base,
1264                                         NULL,
1265                                         NULL,
1266                                         fsp->fsp_name->flags);
1267         if (smb_fname_base == NULL) {
1268                 errno = ENOMEM;
1269                 return -1;
1270         }
1271
1272         status = get_ea_value(talloc_tos(), handle->conn, NULL,
1273                               smb_fname_base, sio->xattr_name, &ea);
1274         if (!NT_STATUS_IS_OK(status)) {
1275                 return -1;
1276         }
1277
1278         tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1279                                    offset + 1);
1280
1281         if (tmp == NULL) {
1282                 TALLOC_FREE(ea.value.data);
1283                 errno = ENOMEM;
1284                 return -1;
1285         }
1286
1287         /* Did we expand ? */
1288         if (ea.value.length < offset + 1) {
1289                 memset(&tmp[ea.value.length], '\0',
1290                         offset + 1 - ea.value.length);
1291         }
1292
1293         ea.value.data = tmp;
1294         ea.value.length = offset + 1;
1295         ea.value.data[offset] = 0;
1296
1297         ret = SMB_VFS_SETXATTR(fsp->conn,
1298                                fsp->fsp_name,
1299                                sio->xattr_name,
1300                                ea.value.data, ea.value.length, 0);
1301         TALLOC_FREE(ea.value.data);
1302
1303         if (ret == -1) {
1304                 return -1;
1305         }
1306
1307         return 0;
1308 }
1309
1310 static int streams_xattr_fallocate(struct vfs_handle_struct *handle,
1311                                         struct files_struct *fsp,
1312                                         uint32_t mode,
1313                                         off_t offset,
1314                                         off_t len)
1315 {
1316         struct stream_io *sio =
1317                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1318
1319         DEBUG(10, ("streams_xattr_fallocate called for file %s offset %.0f"
1320                 "len = %.0f\n",
1321                 fsp_str_dbg(fsp), (double)offset, (double)len));
1322
1323         if (sio == NULL) {
1324                 return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
1325         }
1326
1327         if (!streams_xattr_recheck(sio)) {
1328                 return -1;
1329         }
1330
1331         /* Let the pwrite code path handle it. */
1332         errno = ENOSYS;
1333         return -1;
1334 }
1335
1336 static int streams_xattr_fchown(vfs_handle_struct *handle, files_struct *fsp,
1337                                 uid_t uid, gid_t gid)
1338 {
1339         struct stream_io *sio =
1340                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1341
1342         if (sio == NULL) {
1343                 return SMB_VFS_NEXT_FCHOWN(handle, fsp, uid, gid);
1344         }
1345
1346         return 0;
1347 }
1348
1349 static int streams_xattr_fchmod(vfs_handle_struct *handle,
1350                                 files_struct *fsp,
1351                                 mode_t mode)
1352 {
1353         struct stream_io *sio =
1354                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1355
1356         if (sio == NULL) {
1357                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1358         }
1359
1360         return 0;
1361 }
1362
1363 static ssize_t streams_xattr_fgetxattr(struct vfs_handle_struct *handle,
1364                                        struct files_struct *fsp,
1365                                        const char *name,
1366                                        void *value,
1367                                        size_t size)
1368 {
1369         struct stream_io *sio =
1370                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1371
1372         if (sio == NULL) {
1373                 return SMB_VFS_NEXT_FGETXATTR(handle, fsp, name, value, size);
1374         }
1375
1376         errno = ENOTSUP;
1377         return -1;
1378 }
1379
1380 static ssize_t streams_xattr_flistxattr(struct vfs_handle_struct *handle,
1381                                         struct files_struct *fsp,
1382                                         char *list,
1383                                         size_t size)
1384 {
1385         struct stream_io *sio =
1386                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1387
1388         if (sio == NULL) {
1389                 return SMB_VFS_NEXT_FLISTXATTR(handle, fsp, list, size);
1390         }
1391
1392         errno = ENOTSUP;
1393         return -1;
1394 }
1395
1396 static int streams_xattr_fremovexattr(struct vfs_handle_struct *handle,
1397                                       struct files_struct *fsp,
1398                                       const char *name)
1399 {
1400         struct stream_io *sio =
1401                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1402
1403         if (sio == NULL) {
1404                 return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, name);
1405         }
1406
1407         errno = ENOTSUP;
1408         return -1;
1409 }
1410
1411 static int streams_xattr_fsetxattr(struct vfs_handle_struct *handle,
1412                                    struct files_struct *fsp,
1413                                    const char *name,
1414                                    const void *value,
1415                                    size_t size,
1416                                    int flags)
1417 {
1418         struct stream_io *sio =
1419                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1420
1421         if (sio == NULL) {
1422                 return SMB_VFS_NEXT_FSETXATTR(handle, fsp, name, value,
1423                                               size, flags);
1424         }
1425
1426         errno = ENOTSUP;
1427         return -1;
1428 }
1429
1430 static SMB_ACL_T streams_xattr_sys_acl_get_fd(vfs_handle_struct *handle,
1431                                               files_struct *fsp,
1432                                               TALLOC_CTX *mem_ctx)
1433 {
1434         struct stream_io *sio =
1435                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1436
1437         if (sio == NULL) {
1438                 return SMB_VFS_NEXT_SYS_ACL_GET_FD(handle, fsp, mem_ctx);
1439         }
1440
1441         return SMB_VFS_NEXT_SYS_ACL_GET_FILE(
1442                 handle, fsp->base_fsp->fsp_name,
1443                 SMB_ACL_TYPE_ACCESS, mem_ctx);
1444 }
1445
1446 static int streams_xattr_sys_acl_set_fd(vfs_handle_struct *handle,
1447                                         files_struct *fsp,
1448                                         SMB_ACL_T theacl)
1449 {
1450         struct stream_io *sio =
1451                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1452
1453         if (sio == NULL) {
1454                 return SMB_VFS_NEXT_SYS_ACL_SET_FD(handle, fsp, theacl);
1455         }
1456
1457         return 0;
1458 }
1459
1460 static int streams_xattr_sys_acl_blob_get_fd(vfs_handle_struct *handle,
1461                                              files_struct *fsp,
1462                                              TALLOC_CTX *mem_ctx,
1463                                              char **blob_description,
1464                                              DATA_BLOB *blob)
1465 {
1466         struct stream_io *sio =
1467                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1468
1469         if (sio == NULL) {
1470                 return SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FD(handle, fsp, mem_ctx,
1471                                                         blob_description, blob);
1472         }
1473
1474         return SMB_VFS_NEXT_SYS_ACL_BLOB_GET_FILE(
1475                 handle, fsp->base_fsp->fsp_name, mem_ctx,
1476                 blob_description, blob);
1477 }
1478
1479 static NTSTATUS streams_xattr_fget_nt_acl(vfs_handle_struct *handle,
1480                                           files_struct *fsp,
1481                                           uint32_t security_info,
1482                                           TALLOC_CTX *mem_ctx,
1483                                           struct security_descriptor **ppdesc)
1484 {
1485         struct stream_io *sio =
1486                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1487
1488         if (sio == NULL) {
1489                 return SMB_VFS_NEXT_FGET_NT_ACL(handle, fsp, security_info,
1490                                                 mem_ctx, ppdesc);
1491         }
1492
1493         return SMB_VFS_NEXT_GET_NT_ACL(handle, fsp->base_fsp->fsp_name,
1494                                        security_info, mem_ctx, ppdesc);
1495 }
1496
1497 static NTSTATUS streams_xattr_fset_nt_acl(vfs_handle_struct *handle,
1498                                           files_struct *fsp,
1499                                           uint32_t security_info_sent,
1500                                           const struct security_descriptor *psd)
1501 {
1502         struct stream_io *sio =
1503                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1504
1505         if (sio == NULL) {
1506                 return SMB_VFS_NEXT_FSET_NT_ACL(handle, fsp,
1507                                                 security_info_sent, psd);
1508         }
1509
1510         return NT_STATUS_OK;
1511 }
1512
1513 struct streams_xattr_fsync_state {
1514         int ret;
1515         struct vfs_aio_state vfs_aio_state;
1516 };
1517
1518 static void streams_xattr_fsync_done(struct tevent_req *subreq);
1519
1520 static struct tevent_req *streams_xattr_fsync_send(
1521         struct vfs_handle_struct *handle,
1522         TALLOC_CTX *mem_ctx,
1523         struct tevent_context *ev,
1524         struct files_struct *fsp)
1525 {
1526         struct tevent_req *req = NULL;
1527         struct tevent_req *subreq = NULL;
1528         struct streams_xattr_fsync_state *state = NULL;
1529         struct stream_io *sio =
1530                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1531
1532         req = tevent_req_create(mem_ctx, &state,
1533                                 struct streams_xattr_fsync_state);
1534         if (req == NULL) {
1535                 return NULL;
1536         }
1537
1538         if (sio == NULL) {
1539                 subreq = SMB_VFS_NEXT_FSYNC_SEND(state, ev, handle, fsp);
1540                 if (tevent_req_nomem(req, subreq)) {
1541                         return tevent_req_post(req, ev);
1542                 }
1543                 tevent_req_set_callback(subreq, streams_xattr_fsync_done, req);
1544                 return req;
1545         }
1546
1547         /*
1548          * There's no pathname based sync variant and we don't have access to
1549          * the basefile handle, so we can't do anything here.
1550          */
1551
1552         tevent_req_done(req);
1553         return tevent_req_post(req, ev);
1554 }
1555
1556 static void streams_xattr_fsync_done(struct tevent_req *subreq)
1557 {
1558         struct tevent_req *req = tevent_req_callback_data(
1559                 subreq, struct tevent_req);
1560         struct streams_xattr_fsync_state *state = tevent_req_data(
1561                 req, struct streams_xattr_fsync_state);
1562
1563         state->ret = SMB_VFS_FSYNC_RECV(subreq, &state->vfs_aio_state);
1564         TALLOC_FREE(subreq);
1565         if (state->ret != 0) {
1566                 tevent_req_error(req, errno);
1567                 return;
1568         }
1569
1570         tevent_req_done(req);
1571 }
1572
1573 static int streams_xattr_fsync_recv(struct tevent_req *req,
1574                                     struct vfs_aio_state *vfs_aio_state)
1575 {
1576         struct streams_xattr_fsync_state *state = tevent_req_data(
1577                 req, struct streams_xattr_fsync_state);
1578
1579         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1580                 return -1;
1581         }
1582
1583         *vfs_aio_state = state->vfs_aio_state;
1584         return state->ret;
1585 }
1586
1587 static bool streams_xattr_lock(vfs_handle_struct *handle,
1588                                files_struct *fsp,
1589                                int op,
1590                                off_t offset,
1591                                off_t count,
1592                                int type)
1593 {
1594         struct stream_io *sio =
1595                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1596
1597         if (sio == NULL) {
1598                 return SMB_VFS_NEXT_LOCK(handle, fsp, op, offset, count, type);
1599         }
1600
1601         return true;
1602 }
1603
1604 static bool streams_xattr_getlock(vfs_handle_struct *handle,
1605                                   files_struct *fsp,
1606                                   off_t *poffset,
1607                                   off_t *pcount,
1608                                   int *ptype,
1609                                   pid_t *ppid)
1610 {
1611         struct stream_io *sio =
1612                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1613
1614         if (sio == NULL) {
1615                 return SMB_VFS_NEXT_GETLOCK(handle, fsp, poffset,
1616                                             pcount, ptype, ppid);
1617         }
1618
1619         errno = ENOTSUP;
1620         return false;
1621 }
1622
1623 static int streams_xattr_kernel_flock(vfs_handle_struct *handle,
1624                                       files_struct *fsp,
1625                                       uint32_t share_mode,
1626                                       uint32_t access_mask)
1627 {
1628         struct stream_io *sio =
1629                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1630
1631         if (sio == NULL) {
1632                 return SMB_VFS_NEXT_KERNEL_FLOCK(handle, fsp,
1633                                                  share_mode, access_mask);
1634         }
1635
1636         return 0;
1637 }
1638
1639 static int streams_xattr_linux_setlease(vfs_handle_struct *handle,
1640                                         files_struct *fsp,
1641                                         int leasetype)
1642 {
1643         struct stream_io *sio =
1644                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1645
1646         if (sio == NULL) {
1647                 return SMB_VFS_NEXT_LINUX_SETLEASE(handle, fsp, leasetype);
1648         }
1649
1650         return 0;
1651 }
1652
1653 static bool streams_xattr_strict_lock_check(struct vfs_handle_struct *handle,
1654                                             files_struct *fsp,
1655                                             struct lock_struct *plock)
1656 {
1657         struct stream_io *sio =
1658                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1659
1660         if (sio == NULL) {
1661                 return SMB_VFS_NEXT_STRICT_LOCK_CHECK(handle, fsp, plock);
1662         }
1663
1664         return true;
1665 }
1666
1667 static struct vfs_fn_pointers vfs_streams_xattr_fns = {
1668         .fs_capabilities_fn = streams_xattr_fs_capabilities,
1669         .connect_fn = streams_xattr_connect,
1670         .open_fn = streams_xattr_open,
1671         .close_fn = streams_xattr_close,
1672         .stat_fn = streams_xattr_stat,
1673         .fstat_fn = streams_xattr_fstat,
1674         .lstat_fn = streams_xattr_lstat,
1675         .pread_fn = streams_xattr_pread,
1676         .pwrite_fn = streams_xattr_pwrite,
1677         .pread_send_fn = streams_xattr_pread_send,
1678         .pread_recv_fn = streams_xattr_pread_recv,
1679         .pwrite_send_fn = streams_xattr_pwrite_send,
1680         .pwrite_recv_fn = streams_xattr_pwrite_recv,
1681         .unlink_fn = streams_xattr_unlink,
1682         .unlinkat_fn = streams_xattr_unlinkat,
1683         .renameat_fn = streams_xattr_renameat,
1684         .ftruncate_fn = streams_xattr_ftruncate,
1685         .fallocate_fn = streams_xattr_fallocate,
1686         .streaminfo_fn = streams_xattr_streaminfo,
1687
1688         .fsync_send_fn = streams_xattr_fsync_send,
1689         .fsync_recv_fn = streams_xattr_fsync_recv,
1690
1691         .lock_fn = streams_xattr_lock,
1692         .getlock_fn = streams_xattr_getlock,
1693         .kernel_flock_fn = streams_xattr_kernel_flock,
1694         .linux_setlease_fn = streams_xattr_linux_setlease,
1695         .strict_lock_check_fn = streams_xattr_strict_lock_check,
1696
1697         .fchown_fn = streams_xattr_fchown,
1698         .fchmod_fn = streams_xattr_fchmod,
1699
1700         .fgetxattr_fn = streams_xattr_fgetxattr,
1701         .flistxattr_fn = streams_xattr_flistxattr,
1702         .fremovexattr_fn = streams_xattr_fremovexattr,
1703         .fsetxattr_fn = streams_xattr_fsetxattr,
1704
1705         .sys_acl_get_fd_fn = streams_xattr_sys_acl_get_fd,
1706         .sys_acl_blob_get_fd_fn = streams_xattr_sys_acl_blob_get_fd,
1707         .sys_acl_set_fd_fn = streams_xattr_sys_acl_set_fd,
1708
1709         .fget_nt_acl_fn = streams_xattr_fget_nt_acl,
1710         .fset_nt_acl_fn = streams_xattr_fset_nt_acl,
1711 };
1712
1713 static_decl_vfs;
1714 NTSTATUS vfs_streams_xattr_init(TALLOC_CTX *ctx)
1715 {
1716         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
1717                                 &vfs_streams_xattr_fns);
1718 }