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_fsp(struct files_struct *fsp,
  49                                   const char *xattr_name)
  50 {
  51         NTSTATUS status;
  52         struct ea_struct ea;
  53         ssize_t result;
  54
  55         status = get_ea_value_fsp(talloc_tos(),
  56                                   fsp,
  57                                   xattr_name,
  58                                   &ea);
  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 static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
 179                                SMB_STRUCT_STAT *sbuf)
 180 {
 181         int ret = -1;
 182         struct stream_io *io = (struct stream_io *)
 183                 VFS_FETCH_FSP_EXTENSION(handle, fsp);
 184
 185         if (io == NULL || fsp->base_fsp == NULL) {
 186                 return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
 187         }
 188
 189         DBG_DEBUG("streams_xattr_fstat called for %s\n", fsp_str_dbg(io->fsp));
 190
 191         if (!streams_xattr_recheck(io)) {
 192                 return -1;
 193         }
 194
 195         ret = SMB_VFS_NEXT_FSTAT(handle, fsp->base_fsp, sbuf);
 196         if (ret == -1) {
 197                 return -1;
 198         }
 199
 200         sbuf->st_ex_size = get_xattr_size_fsp(fsp->base_fsp,
 201                                               io->xattr_name);
 202         if (sbuf->st_ex_size == -1) {
 203                 SET_STAT_INVALID(*sbuf);
 204                 return -1;
 205         }
 206
 207         DEBUG(10, ("sbuf->st_ex_size = %d\n", (int)sbuf->st_ex_size));
 208
 209         sbuf->st_ex_ino = hash_inode(sbuf, io->xattr_name);
 210         sbuf->st_ex_mode &= ~S_IFMT;
 211         sbuf->st_ex_mode &= ~S_IFDIR;
 212         sbuf->st_ex_mode |= S_IFREG;
 213         sbuf->st_ex_blocks = sbuf->st_ex_size / STAT_ST_BLOCKSIZE + 1;
 214
 215         return 0;
 216 }
 217
 218 static int streams_xattr_stat(vfs_handle_struct *handle,
 219                               struct smb_filename *smb_fname)
 220 {
 221         NTSTATUS status;
 222         int result = -1;
 223         char *xattr_name = NULL;
 224         char *tmp_stream_name = NULL;
 225         struct smb_filename *smb_fname_cp = NULL;
 226         struct files_struct *fsp = smb_fname->fsp;
 227
 228         if (!is_named_stream(smb_fname)) {
 229                 return SMB_VFS_NEXT_STAT(handle, smb_fname);
 230         }
 231
 232         /* Note if lp_posix_paths() is true, we can never
 233          * get here as is_named_stream() is
 234          * always false. So we never need worry about
 235          * not following links here. */
 236
 237         /* Populate the stat struct with info from the base file. */
 238         tmp_stream_name = smb_fname->stream_name;
 239         smb_fname->stream_name = NULL;
 240         result = SMB_VFS_NEXT_STAT(handle, smb_fname);
 241         smb_fname->stream_name = tmp_stream_name;
 242
 243         if (result == -1) {
 244                 return -1;
 245         }
 246
 247         /* Derive the xattr name to lookup. */
 248         status = streams_xattr_get_name(handle, talloc_tos(),
 249                                         smb_fname->stream_name, &xattr_name);
 250         if (!NT_STATUS_IS_OK(status)) {
 251                 errno = map_errno_from_nt_status(status);
 252                 return -1;
 253         }
 254
 255         /* Augment the base file's stat information before returning. */
 256         if (fsp == NULL) {
 257                 /*
 258                  * openat_pathref_fsp() checks for the same
 259                  * filetype as the incoming stat info before allowing
 260                  * the open, so we must ensure it's correct here.
 261                  */
 262                 smb_fname->st.st_ex_mode &= ~S_IFMT;
 263                 smb_fname->st.st_ex_mode |= S_IFREG;
 264
 265                 /*
 266                  * openat_pathref_fsp() expects a talloc'ed
 267                  * smb_filename. stat can be passed a struct
 268                  * from the stack. Make a talloc'ed copy
 269                  * so openat_pathref_fsp() can add its
 270                  * destructor.
 271                  */
 272                 smb_fname_cp = cp_smb_filename(talloc_tos(),
 273                                                smb_fname);
 274                 if (smb_fname_cp == NULL) {
 275                         TALLOC_FREE(xattr_name);
 276                         errno = ENOMEM;
 277                         return -1;
 278                 }
 279                 status = openat_pathref_fsp(handle->conn->cwd_fsp,
 280                                             smb_fname_cp);
 281                 if (!NT_STATUS_IS_OK(status)) {
 282                         DBG_DEBUG("openat_pathref_fsp for %s failed with %s\n",
 283                                 smb_fname_str_dbg(smb_fname),
 284                                 nt_errstr(status));
 285                         TALLOC_FREE(xattr_name);
 286                         TALLOC_FREE(smb_fname_cp);
 287                         SET_STAT_INVALID(smb_fname->st);
 288                         errno = ENOENT;
 289                         return -1;
 290                 }
 291                 fsp = smb_fname_cp->fsp;
 292         }
 293
 294         SMB_ASSERT(fsp->base_fsp != NULL);
 295         smb_fname->st.st_ex_size = get_xattr_size_fsp(fsp->base_fsp,
 296                                                       xattr_name);
 297         if (smb_fname->st.st_ex_size == -1) {
 298                 TALLOC_FREE(xattr_name);
 299                 TALLOC_FREE(smb_fname_cp);
 300                 SET_STAT_INVALID(smb_fname->st);
 301                 errno = ENOENT;
 302                 return -1;
 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_IFREG;
 308         smb_fname->st.st_ex_blocks =
 309             smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
 310
 311         TALLOC_FREE(xattr_name);
 312         TALLOC_FREE(smb_fname_cp);
 313         return 0;
 314 }
 315
 316 static int streams_xattr_lstat(vfs_handle_struct *handle,
 317                                struct smb_filename *smb_fname)
 318 {
 319         if (is_named_stream(smb_fname)) {
 320                 /*
 321                  * There can never be EA's on a symlink.
 322                  * Windows will never see a symlink, and
 323                  * in SMB_FILENAME_POSIX_PATH mode we don't
 324                  * allow EA's on a symlink.
 325                  */
 326                 SET_STAT_INVALID(smb_fname->st);
 327                 errno = ENOENT;
 328                 return -1;
 329         }
 330         return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
 331 }
 332
 333 static int streams_xattr_openat(struct vfs_handle_struct *handle,
 334                                 const struct files_struct *dirfsp,
 335                                 const struct smb_filename *smb_fname,
 336                                 files_struct *fsp,
 337                                 int flags,
 338                                 mode_t mode)
 339 {
 340         NTSTATUS status;
 341         struct streams_xattr_config *config = NULL;
 342         struct stream_io *sio = NULL;
 343         struct ea_struct ea;
 344         char *xattr_name = NULL;
 345         int fakefd = -1;
 346         bool set_empty_xattr = false;
 347         int ret;
 348
 349         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 350                                 return -1);
 351
 352         DEBUG(10, ("streams_xattr_open called for %s with flags 0x%x\n",
 353                    smb_fname_str_dbg(smb_fname), flags));
 354
 355         if (!is_named_stream(smb_fname)) {
 356                 return SMB_VFS_NEXT_OPENAT(handle,
 357                                            dirfsp,
 358                                            smb_fname,
 359                                            fsp,
 360                                            flags,
 361                                            mode);
 362         }
 363
 364         /*
 365          * For now assert this, so the below SMB_VFS_SETXATTR() works.
 366          */
 367         SMB_ASSERT(fsp_get_pathref_fd(dirfsp) == AT_FDCWD);
 368
 369         status = streams_xattr_get_name(handle, talloc_tos(),
 370                                         smb_fname->stream_name, &xattr_name);
 371         if (!NT_STATUS_IS_OK(status)) {
 372                 errno = map_errno_from_nt_status(status);
 373                 goto fail;
 374         }
 375
 376         status = get_ea_value_fsp(talloc_tos(),
 377                                   fsp->base_fsp,
 378                                   xattr_name,
 379                                   &ea);
 380
 381         DBG_DEBUG("get_ea_value_fsp returned %s\n", nt_errstr(status));
 382
 383         if (!NT_STATUS_IS_OK(status)) {
 384                 if (!NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
 385                         /*
 386                          * The base file is not there. This is an error even if
 387                          * we got O_CREAT, the higher levels should have created
 388                          * the base file for us.
 389                          */
 390                         DBG_DEBUG("streams_xattr_open: base file %s not around, "
 391                                   "returning ENOENT\n", smb_fname->base_name);
 392                         errno = ENOENT;
 393                         goto fail;
 394                 }
 395
 396                 if (!(flags & O_CREAT)) {
 397                         errno = ENOATTR;
 398                         goto fail;
 399                 }
 400
 401                 set_empty_xattr = true;
 402         }
 403
 404         if (flags & O_TRUNC) {
 405                 set_empty_xattr = true;
 406         }
 407
 408         if (set_empty_xattr) {
 409                 /*
 410                  * The attribute does not exist or needs to be truncated
 411                  */
 412
 413                 /*
 414                  * Darn, xattrs need at least 1 byte
 415                  */
 416                 char null = '\0';
 417
 418                 DEBUG(10, ("creating or truncating attribute %s on file %s\n",
 419                            xattr_name, smb_fname->base_name));
 420
 421                 ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
 422                                        xattr_name,
 423                                        &null, sizeof(null),
 424                                        flags & O_EXCL ? XATTR_CREATE : 0);
 425                 if (ret != 0) {
 426                         goto fail;
 427                 }
 428         }
 429
 430         fakefd = vfs_fake_fd();
 431
 432         sio = VFS_ADD_FSP_EXTENSION(handle, fsp, struct stream_io, NULL);
 433         if (sio == NULL) {
 434                 errno = ENOMEM;
 435                 goto fail;
 436         }
 437
 438         sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 439                                         xattr_name);
 440         if (sio->xattr_name == NULL) {
 441                 errno = ENOMEM;
 442                 goto fail;
 443         }
 444
 445         /*
 446          * so->base needs to be a copy of fsp->fsp_name->base_name,
 447          * making it identical to streams_xattr_recheck(). If the
 448          * open is changing directories, fsp->fsp_name->base_name
 449          * will be the full path from the share root, whilst
 450          * smb_fname will be relative to the $cwd.
 451          */
 452         sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
 453                                   fsp->fsp_name->base_name);
 454         if (sio->base == NULL) {
 455                 errno = ENOMEM;
 456                 goto fail;
 457         }
 458
 459         sio->fsp_name_ptr = fsp->fsp_name;
 460         sio->handle = handle;
 461         sio->fsp = fsp;
 462
 463         return fakefd;
 464
 465  fail:
 466         if (fakefd >= 0) {
 467                 vfs_fake_fd_close(fakefd);
 468                 fakefd = -1;
 469         }
 470
 471         return -1;
 472 }
 473
 474 static int streams_xattr_close(vfs_handle_struct *handle,
 475                                files_struct *fsp)
 476 {
 477         int ret;
 478         int fd;
 479
 480         fd = fsp_get_pathref_fd(fsp);
 481
 482         DBG_DEBUG("streams_xattr_close called [%s] fd [%d]\n",
 483                         smb_fname_str_dbg(fsp->fsp_name), fd);
 484
 485         if (!is_named_stream(fsp->fsp_name)) {
 486                 return SMB_VFS_NEXT_CLOSE(handle, fsp);
 487         }
 488
 489         ret = vfs_fake_fd_close(fd);
 490         fsp_set_fd(fsp, -1);
 491
 492         return ret;
 493 }
 494
 495 static int streams_xattr_unlink_internal(vfs_handle_struct *handle,
 496                         struct files_struct *dirfsp,
 497                         const struct smb_filename *smb_fname,
 498                         int flags)
 499 {
 500         NTSTATUS status;
 501         int ret = -1;
 502         char *xattr_name = NULL;
 503
 504         if (!is_named_stream(smb_fname)) {
 505                 return SMB_VFS_NEXT_UNLINKAT(handle,
 506                                         dirfsp,
 507                                         smb_fname,
 508                                         flags);
 509         }
 510
 511         status = streams_xattr_get_name(handle, talloc_tos(),
 512                                         smb_fname->stream_name, &xattr_name);
 513         if (!NT_STATUS_IS_OK(status)) {
 514                 errno = map_errno_from_nt_status(status);
 515                 goto fail;
 516         }
 517
 518         SMB_ASSERT(smb_fname->fsp != NULL);
 519         SMB_ASSERT(smb_fname->fsp->base_fsp != NULL);
 520
 521         ret = SMB_VFS_FREMOVEXATTR(smb_fname->fsp->base_fsp, xattr_name);
 522
 523         if ((ret == -1) && (errno == ENOATTR)) {
 524                 errno = ENOENT;
 525                 goto fail;
 526         }
 527
 528         ret = 0;
 529
 530  fail:
 531         TALLOC_FREE(xattr_name);
 532         return ret;
 533 }
 534
 535 static int streams_xattr_unlinkat(vfs_handle_struct *handle,
 536                         struct files_struct *dirfsp,
 537                         const struct smb_filename *smb_fname,
 538                         int flags)
 539 {
 540         int ret;
 541         if (flags & AT_REMOVEDIR) {
 542                 ret = SMB_VFS_NEXT_UNLINKAT(handle,
 543                                 dirfsp,
 544                                 smb_fname,
 545                                 flags);
 546         } else {
 547                 ret = streams_xattr_unlink_internal(handle,
 548                                 dirfsp,
 549                                 smb_fname,
 550                                 flags);
 551         }
 552         return ret;
 553 }
 554
 555 static int streams_xattr_renameat(vfs_handle_struct *handle,
 556                                 files_struct *srcfsp,
 557                                 const struct smb_filename *smb_fname_src,
 558                                 files_struct *dstfsp,
 559                                 const struct smb_filename *smb_fname_dst)
 560 {
 561         NTSTATUS status;
 562         int ret = -1;
 563         char *src_xattr_name = NULL;
 564         char *dst_xattr_name = NULL;
 565         bool src_is_stream, dst_is_stream;
 566         ssize_t oret;
 567         ssize_t nret;
 568         struct ea_struct ea;
 569         struct smb_filename *pathref_src = NULL;
 570         struct smb_filename *pathref_dst = NULL;
 571         struct smb_filename *full_src = NULL;
 572         struct smb_filename *full_dst = NULL;
 573
 574         src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
 575         dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
 576
 577         if (!src_is_stream && !dst_is_stream) {
 578                 return SMB_VFS_NEXT_RENAMEAT(handle,
 579                                         srcfsp,
 580                                         smb_fname_src,
 581                                         dstfsp,
 582                                         smb_fname_dst);
 583         }
 584
 585         /* For now don't allow renames from or to the default stream. */
 586         if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
 587             is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
 588                 errno = ENOSYS;
 589                 goto done;
 590         }
 591
 592         /* Don't rename if the streams are identical. */
 593         if (strcasecmp_m(smb_fname_src->stream_name,
 594                        smb_fname_dst->stream_name) == 0) {
 595                 goto done;
 596         }
 597
 598         /* Get the xattr names. */
 599         status = streams_xattr_get_name(handle, talloc_tos(),
 600                                         smb_fname_src->stream_name,
 601                                         &src_xattr_name);
 602         if (!NT_STATUS_IS_OK(status)) {
 603                 errno = map_errno_from_nt_status(status);
 604                 goto fail;
 605         }
 606         status = streams_xattr_get_name(handle, talloc_tos(),
 607                                         smb_fname_dst->stream_name,
 608                                         &dst_xattr_name);
 609         if (!NT_STATUS_IS_OK(status)) {
 610                 errno = map_errno_from_nt_status(status);
 611                 goto fail;
 612         }
 613
 614         full_src = full_path_from_dirfsp_atname(talloc_tos(),
 615                                                 srcfsp,
 616                                                 smb_fname_src);
 617         if (full_src == NULL) {
 618                 errno = ENOMEM;
 619                 goto fail;
 620         }
 621         full_dst = full_path_from_dirfsp_atname(talloc_tos(),
 622                                                 dstfsp,
 623                                                 smb_fname_dst);
 624         if (full_dst == NULL) {
 625                 errno = ENOMEM;
 626                 goto fail;
 627         }
 628
 629         /* Get a pathref for full_src (base file, no stream name). */
 630         status = synthetic_pathref(talloc_tos(),
 631                                 handle->conn->cwd_fsp,
 632                                 full_src->base_name,
 633                                 NULL,
 634                                 NULL,
 635                                 full_src->twrp,
 636                                 full_src->flags,
 637                                 &pathref_src);
 638         if (!NT_STATUS_IS_OK(status)) {
 639                 errno = ENOENT;
 640                 goto fail;
 641         }
 642
 643         /* Read the old stream from the base file fsp. */
 644         status = get_ea_value_fsp(talloc_tos(),
 645                                   pathref_src->fsp,
 646                                   src_xattr_name,
 647                                   &ea);
 648         if (!NT_STATUS_IS_OK(status)) {
 649                 errno = map_errno_from_nt_status(status);
 650                 goto fail;
 651         }
 652
 653         /* Get a pathref for full_dst (base file, no stream name). */
 654         status = synthetic_pathref(talloc_tos(),
 655                                 handle->conn->cwd_fsp,
 656                                 full_dst->base_name,
 657                                 NULL,
 658                                 NULL,
 659                                 full_dst->twrp,
 660                                 full_dst->flags,
 661                                 &pathref_dst);
 662         if (!NT_STATUS_IS_OK(status)) {
 663                 errno = ENOENT;
 664                 goto fail;
 665         }
 666
 667         /* (Over)write the new stream on the base file fsp. */
 668         nret = SMB_VFS_FSETXATTR(
 669                         pathref_dst->fsp,
 670                         dst_xattr_name,
 671                         ea.value.data,
 672                         ea.value.length,
 673                         0);
 674         if (nret < 0) {
 675                 if (errno == ENOATTR) {
 676                         errno = ENOENT;
 677                 }
 678                 goto fail;
 679         }
 680
 681         /*
 682          * Remove the old stream from the base file fsp.
 683          */
 684         oret = SMB_VFS_FREMOVEXATTR(pathref_src->fsp,
 685                                     src_xattr_name);
 686         if (oret < 0) {
 687                 if (errno == ENOATTR) {
 688                         errno = ENOENT;
 689                 }
 690                 goto fail;
 691         }
 692
 693  done:
 694         errno = 0;
 695         ret = 0;
 696  fail:
 697         TALLOC_FREE(pathref_src);
 698         TALLOC_FREE(pathref_dst);
 699         TALLOC_FREE(full_src);
 700         TALLOC_FREE(full_dst);
 701         TALLOC_FREE(src_xattr_name);
 702         TALLOC_FREE(dst_xattr_name);
 703         return ret;
 704 }
 705
 706 static NTSTATUS walk_xattr_streams(vfs_handle_struct *handle,
 707                                 files_struct *fsp,
 708                                 const struct smb_filename *smb_fname,
 709                                 bool (*fn)(struct ea_struct *ea,
 710                                         void *private_data),
 711                                 void *private_data)
 712 {
 713         NTSTATUS status;
 714         char **names;
 715         size_t i, num_names;
 716         struct streams_xattr_config *config;
 717
 718         SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
 719                                 return NT_STATUS_UNSUCCESSFUL);
 720
 721         status = get_ea_names_from_file(talloc_tos(),
 722                                 smb_fname->fsp,
 723                                 &names,
 724                                 &num_names);
 725         if (!NT_STATUS_IS_OK(status)) {
 726                 return status;
 727         }
 728
 729         for (i=0; i<num_names; i++) {
 730                 struct ea_struct ea;
 731
 732                 /*
 733                  * We want to check with samba_private_attr_name()
 734                  * whether the xattr name is a private one,
 735                  * unfortunately it flags xattrs that begin with the
 736                  * default streams prefix as private.
 737                  *
 738                  * By only calling samba_private_attr_name() in case
 739                  * the xattr does NOT begin with the default prefix,
 740                  * we know that if it returns 'true' it definitely one
 741                  * of our internal xattr like "user.DOSATTRIB".
 742                  */
 743                 if (strncasecmp_m(names[i], SAMBA_XATTR_DOSSTREAM_PREFIX,
 744                                   strlen(SAMBA_XATTR_DOSSTREAM_PREFIX)) != 0) {
 745                         if (samba_private_attr_name(names[i])) {
 746                                 continue;
 747                         }
 748                 }
 749
 750                 if (strncmp(names[i], config->prefix,
 751                             config->prefix_len) != 0) {
 752                         continue;
 753                 }
 754
 755                 status = get_ea_value_fsp(names,
 756                                           smb_fname->fsp,
 757                                           names[i],
 758                                           &ea);
 759                 if (!NT_STATUS_IS_OK(status)) {
 760                         DEBUG(10, ("Could not get ea %s for file %s: %s\n",
 761                                 names[i],
 762                                 smb_fname->base_name,
 763                                 nt_errstr(status)));
 764                         continue;
 765                 }
 766
 767                 ea.name = talloc_asprintf(
 768                         ea.value.data, ":%s%s",
 769                         names[i] + config->prefix_len,
 770                         config->store_stream_type ? "" : ":$DATA");
 771                 if (ea.name == NULL) {
 772                         DEBUG(0, ("talloc failed\n"));
 773                         continue;
 774                 }
 775
 776                 if (!fn(&ea, private_data)) {
 777                         TALLOC_FREE(ea.value.data);
 778                         return NT_STATUS_OK;
 779                 }
 780
 781                 TALLOC_FREE(ea.value.data);
 782         }
 783
 784         TALLOC_FREE(names);
 785         return NT_STATUS_OK;
 786 }
 787
 788 static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
 789                            struct stream_struct **streams,
 790                            const char *name, off_t size,
 791                            off_t alloc_size)
 792 {
 793         struct stream_struct *tmp;
 794
 795         tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
 796                                    (*num_streams)+1);
 797         if (tmp == NULL) {
 798                 return false;
 799         }
 800
 801         tmp[*num_streams].name = talloc_strdup(tmp, name);
 802         if (tmp[*num_streams].name == NULL) {
 803                 return false;
 804         }
 805
 806         tmp[*num_streams].size = size;
 807         tmp[*num_streams].alloc_size = alloc_size;
 808
 809         *streams = tmp;
 810         *num_streams += 1;
 811         return true;
 812 }
 813
 814 struct streaminfo_state {
 815         TALLOC_CTX *mem_ctx;
 816         vfs_handle_struct *handle;
 817         unsigned int num_streams;
 818         struct stream_struct *streams;
 819         NTSTATUS status;
 820 };
 821
 822 static bool collect_one_stream(struct ea_struct *ea, void *private_data)
 823 {
 824         struct streaminfo_state *state =
 825                 (struct streaminfo_state *)private_data;
 826
 827         if (!add_one_stream(state->mem_ctx,
 828                             &state->num_streams, &state->streams,
 829                             ea->name, ea->value.length-1,
 830                             smb_roundup(state->handle->conn,
 831                                         ea->value.length-1))) {
 832                 state->status = NT_STATUS_NO_MEMORY;
 833                 return false;
 834         }
 835
 836         return true;
 837 }
 838
 839 static NTSTATUS streams_xattr_fstreaminfo(vfs_handle_struct *handle,
 840                                          struct files_struct *fsp,
 841                                          TALLOC_CTX *mem_ctx,
 842                                          unsigned int *pnum_streams,
 843                                          struct stream_struct **pstreams)
 844 {
 845         NTSTATUS status;
 846         struct streaminfo_state state;
 847
 848         state.streams = *pstreams;
 849         state.num_streams = *pnum_streams;
 850         state.mem_ctx = mem_ctx;
 851         state.handle = handle;
 852         state.status = NT_STATUS_OK;
 853
 854         status = walk_xattr_streams(handle,
 855                                     fsp,
 856                                     fsp->fsp_name,
 857                                     collect_one_stream,
 858                                     &state);
 859
 860         if (!NT_STATUS_IS_OK(status)) {
 861                 TALLOC_FREE(state.streams);
 862                 return status;
 863         }
 864
 865         if (!NT_STATUS_IS_OK(state.status)) {
 866                 TALLOC_FREE(state.streams);
 867                 return state.status;
 868         }
 869
 870         *pnum_streams = state.num_streams;
 871         *pstreams = state.streams;
 872
 873         return SMB_VFS_NEXT_FSTREAMINFO(handle,
 874                         fsp,
 875                         mem_ctx,
 876                         pnum_streams,
 877                         pstreams);
 878 }
 879
 880 static uint32_t streams_xattr_fs_capabilities(struct vfs_handle_struct *handle,
 881                         enum timestamp_set_resolution *p_ts_res)
 882 {
 883         return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
 884 }
 885
 886 static int streams_xattr_connect(vfs_handle_struct *handle,
 887                                  const char *service, const char *user)
 888 {
 889         struct streams_xattr_config *config;
 890         const char *default_prefix = SAMBA_XATTR_DOSSTREAM_PREFIX;
 891         const char *prefix;
 892         int rc;
 893
 894         rc = SMB_VFS_NEXT_CONNECT(handle, service, user);
 895         if (rc != 0) {
 896                 return rc;
 897         }
 898
 899         config = talloc_zero(handle->conn, struct streams_xattr_config);
 900         if (config == NULL) {
 901                 DEBUG(1, ("talloc_zero() failed\n"));
 902                 errno = ENOMEM;
 903                 return -1;
 904         }
 905
 906         prefix = lp_parm_const_string(SNUM(handle->conn),
 907                                       "streams_xattr", "prefix",
 908                                       default_prefix);
 909         config->prefix = talloc_strdup(config, prefix);
 910         if (config->prefix == NULL) {
 911                 DEBUG(1, ("talloc_strdup() failed\n"));
 912                 errno = ENOMEM;
 913                 return -1;
 914         }
 915         config->prefix_len = strlen(config->prefix);
 916         DEBUG(10, ("streams_xattr using stream prefix: %s\n", config->prefix));
 917
 918         config->store_stream_type = lp_parm_bool(SNUM(handle->conn),
 919                                                  "streams_xattr",
 920                                                  "store_stream_type",
 921                                                  true);
 922
 923         SMB_VFS_HANDLE_SET_DATA(handle, config,
 924                                 NULL, struct stream_xattr_config,
 925                                 return -1);
 926
 927         return 0;
 928 }
 929
 930 static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
 931                                     files_struct *fsp, const void *data,
 932                                     size_t n, off_t offset)
 933 {
 934         struct stream_io *sio =
 935                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
 936         struct ea_struct ea;
 937         NTSTATUS status;
 938         int ret;
 939
 940         DEBUG(10, ("streams_xattr_pwrite called for %d bytes\n", (int)n));
 941
 942         if (sio == NULL) {
 943                 return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
 944         }
 945
 946         if (!streams_xattr_recheck(sio)) {
 947                 return -1;
 948         }
 949
 950         if ((offset + n) >= lp_smbd_max_xattr_size(SNUM(handle->conn))) {
 951                 /*
 952                  * Requested write is beyond what can be read based on
 953                  * samba configuration.
 954                  * ReFS returns STATUS_FILESYSTEM_LIMITATION, which causes
 955                  * entire file to be skipped by File Explorer. VFAT returns
 956                  * NT_STATUS_OBJECT_NAME_COLLISION causes user to be prompted
 957                  * to skip writing metadata, but copy data.
 958                  */
 959                 DBG_ERR("Write to xattr [%s] on file [%s] exceeds maximum "
 960                         "supported extended attribute size. "
 961                         "Depending on filesystem type and operating system "
 962                         "(OS) specifics, this value may be increased using "
 963                         "the value of the parameter: "
 964                         "smbd max xattr size = <bytes>. Consult OS and "
 965                         "filesystem manpages prior to increasing this limit.\n",
 966                         sio->xattr_name, sio->base);
 967                 errno = EOVERFLOW;
 968                 return -1;
 969         }
 970
 971         status = get_ea_value_fsp(talloc_tos(),
 972                                   fsp->base_fsp,
 973                                   sio->xattr_name,
 974                                   &ea);
 975         if (!NT_STATUS_IS_OK(status)) {
 976                 return -1;
 977         }
 978
 979         if ((offset + n) > ea.value.length-1) {
 980                 uint8_t *tmp;
 981
 982                 tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
 983                                            offset + n + 1);
 984
 985                 if (tmp == NULL) {
 986                         TALLOC_FREE(ea.value.data);
 987                         errno = ENOMEM;
 988                         return -1;
 989                 }
 990                 ea.value.data = tmp;
 991                 ea.value.length = offset + n + 1;
 992                 ea.value.data[offset+n] = 0;
 993         }
 994
 995         memcpy(ea.value.data + offset, data, n);
 996
 997         ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
 998                                 sio->xattr_name,
 999                                 ea.value.data,
1000                                 ea.value.length,
1001                                 0);
1002         TALLOC_FREE(ea.value.data);
1003
1004         if (ret == -1) {
1005                 return -1;
1006         }
1007
1008         return n;
1009 }
1010
1011 static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
1012                                    files_struct *fsp, void *data,
1013                                    size_t n, off_t offset)
1014 {
1015         struct stream_io *sio =
1016                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1017         struct ea_struct ea;
1018         NTSTATUS status;
1019         size_t length, overlap;
1020
1021         DEBUG(10, ("streams_xattr_pread: offset=%d, size=%d\n",
1022                    (int)offset, (int)n));
1023
1024         if (sio == NULL) {
1025                 return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
1026         }
1027
1028         if (!streams_xattr_recheck(sio)) {
1029                 return -1;
1030         }
1031
1032         status = get_ea_value_fsp(talloc_tos(),
1033                                   fsp->base_fsp,
1034                                   sio->xattr_name,
1035                                   &ea);
1036         if (!NT_STATUS_IS_OK(status)) {
1037                 return -1;
1038         }
1039
1040         length = ea.value.length-1;
1041
1042         DBG_DEBUG("get_ea_value_fsp returned %d bytes\n",
1043                    (int)length);
1044
1045         /* Attempt to read past EOF. */
1046         if (length <= offset) {
1047                 return 0;
1048         }
1049
1050         overlap = (offset + n) > length ? (length - offset) : n;
1051         memcpy(data, ea.value.data + offset, overlap);
1052
1053         TALLOC_FREE(ea.value.data);
1054         return overlap;
1055 }
1056
1057 struct streams_xattr_pread_state {
1058         ssize_t nread;
1059         struct vfs_aio_state vfs_aio_state;
1060 };
1061
1062 static void streams_xattr_pread_done(struct tevent_req *subreq);
1063
1064 static struct tevent_req *streams_xattr_pread_send(
1065         struct vfs_handle_struct *handle,
1066         TALLOC_CTX *mem_ctx,
1067         struct tevent_context *ev,
1068         struct files_struct *fsp,
1069         void *data,
1070         size_t n, off_t offset)
1071 {
1072         struct tevent_req *req = NULL;
1073         struct tevent_req *subreq = NULL;
1074         struct streams_xattr_pread_state *state = NULL;
1075         struct stream_io *sio =
1076                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1077
1078         req = tevent_req_create(mem_ctx, &state,
1079                                 struct streams_xattr_pread_state);
1080         if (req == NULL) {
1081                 return NULL;
1082         }
1083
1084         if (sio == NULL) {
1085                 subreq = SMB_VFS_NEXT_PREAD_SEND(state, ev, handle, fsp,
1086                                                  data, n, offset);
1087                 if (tevent_req_nomem(req, subreq)) {
1088                         return tevent_req_post(req, ev);
1089                 }
1090                 tevent_req_set_callback(subreq, streams_xattr_pread_done, req);
1091                 return req;
1092         }
1093
1094         state->nread = SMB_VFS_PREAD(fsp, data, n, offset);
1095         if (state->nread != n) {
1096                 if (state->nread != -1) {
1097                         errno = EIO;
1098                 }
1099                 tevent_req_error(req, errno);
1100                 return tevent_req_post(req, ev);
1101         }
1102
1103         tevent_req_done(req);
1104         return tevent_req_post(req, ev);
1105 }
1106
1107 static void streams_xattr_pread_done(struct tevent_req *subreq)
1108 {
1109         struct tevent_req *req = tevent_req_callback_data(
1110                 subreq, struct tevent_req);
1111         struct streams_xattr_pread_state *state = tevent_req_data(
1112                 req, struct streams_xattr_pread_state);
1113
1114         state->nread = SMB_VFS_PREAD_RECV(subreq, &state->vfs_aio_state);
1115         TALLOC_FREE(subreq);
1116
1117         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1118                 return;
1119         }
1120         tevent_req_done(req);
1121 }
1122
1123 static ssize_t streams_xattr_pread_recv(struct tevent_req *req,
1124                                         struct vfs_aio_state *vfs_aio_state)
1125 {
1126         struct streams_xattr_pread_state *state = tevent_req_data(
1127                 req, struct streams_xattr_pread_state);
1128
1129         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1130                 return -1;
1131         }
1132
1133         *vfs_aio_state = state->vfs_aio_state;
1134         return state->nread;
1135 }
1136
1137 struct streams_xattr_pwrite_state {
1138         ssize_t nwritten;
1139         struct vfs_aio_state vfs_aio_state;
1140 };
1141
1142 static void streams_xattr_pwrite_done(struct tevent_req *subreq);
1143
1144 static struct tevent_req *streams_xattr_pwrite_send(
1145         struct vfs_handle_struct *handle,
1146         TALLOC_CTX *mem_ctx,
1147         struct tevent_context *ev,
1148         struct files_struct *fsp,
1149         const void *data,
1150         size_t n, off_t offset)
1151 {
1152         struct tevent_req *req = NULL;
1153         struct tevent_req *subreq = NULL;
1154         struct streams_xattr_pwrite_state *state = NULL;
1155         struct stream_io *sio =
1156                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1157
1158         req = tevent_req_create(mem_ctx, &state,
1159                                 struct streams_xattr_pwrite_state);
1160         if (req == NULL) {
1161                 return NULL;
1162         }
1163
1164         if (sio == NULL) {
1165                 subreq = SMB_VFS_NEXT_PWRITE_SEND(state, ev, handle, fsp,
1166                                                   data, n, offset);
1167                 if (tevent_req_nomem(req, subreq)) {
1168                         return tevent_req_post(req, ev);
1169                 }
1170                 tevent_req_set_callback(subreq, streams_xattr_pwrite_done, req);
1171                 return req;
1172         }
1173
1174         state->nwritten = SMB_VFS_PWRITE(fsp, data, n, offset);
1175         if (state->nwritten != n) {
1176                 if (state->nwritten != -1) {
1177                         errno = EIO;
1178                 }
1179                 tevent_req_error(req, errno);
1180                 return tevent_req_post(req, ev);
1181         }
1182
1183         tevent_req_done(req);
1184         return tevent_req_post(req, ev);
1185 }
1186
1187 static void streams_xattr_pwrite_done(struct tevent_req *subreq)
1188 {
1189         struct tevent_req *req = tevent_req_callback_data(
1190                 subreq, struct tevent_req);
1191         struct streams_xattr_pwrite_state *state = tevent_req_data(
1192                 req, struct streams_xattr_pwrite_state);
1193
1194         state->nwritten = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
1195         TALLOC_FREE(subreq);
1196
1197         if (tevent_req_error(req, state->vfs_aio_state.error)) {
1198                 return;
1199         }
1200         tevent_req_done(req);
1201 }
1202
1203 static ssize_t streams_xattr_pwrite_recv(struct tevent_req *req,
1204                                          struct vfs_aio_state *vfs_aio_state)
1205 {
1206         struct streams_xattr_pwrite_state *state = tevent_req_data(
1207                 req, struct streams_xattr_pwrite_state);
1208
1209         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1210                 return -1;
1211         }
1212
1213         *vfs_aio_state = state->vfs_aio_state;
1214         return state->nwritten;
1215 }
1216
1217 static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
1218                                         struct files_struct *fsp,
1219                                         off_t offset)
1220 {
1221         int ret;
1222         uint8_t *tmp;
1223         struct ea_struct ea;
1224         NTSTATUS status;
1225         struct stream_io *sio =
1226                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1227
1228         DEBUG(10, ("streams_xattr_ftruncate called for file %s offset %.0f\n",
1229                    fsp_str_dbg(fsp), (double)offset));
1230
1231         if (sio == NULL) {
1232                 return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
1233         }
1234
1235         if (!streams_xattr_recheck(sio)) {
1236                 return -1;
1237         }
1238
1239         status = get_ea_value_fsp(talloc_tos(),
1240                                   fsp->base_fsp,
1241                                   sio->xattr_name,
1242                                   &ea);
1243         if (!NT_STATUS_IS_OK(status)) {
1244                 return -1;
1245         }
1246
1247         tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
1248                                    offset + 1);
1249
1250         if (tmp == NULL) {
1251                 TALLOC_FREE(ea.value.data);
1252                 errno = ENOMEM;
1253                 return -1;
1254         }
1255
1256         /* Did we expand ? */
1257         if (ea.value.length < offset + 1) {
1258                 memset(&tmp[ea.value.length], '\0',
1259                         offset + 1 - ea.value.length);
1260         }
1261
1262         ea.value.data = tmp;
1263         ea.value.length = offset + 1;
1264         ea.value.data[offset] = 0;
1265
1266         ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
1267                                 sio->xattr_name,
1268                                 ea.value.data,
1269                                 ea.value.length,
1270                                 0);
1271
1272         TALLOC_FREE(ea.value.data);
1273
1274         if (ret == -1) {
1275                 return -1;
1276         }
1277
1278         return 0;
1279 }
1280
1281 static int streams_xattr_fallocate(struct vfs_handle_struct *handle,
1282                                         struct files_struct *fsp,
1283                                         uint32_t mode,
1284                                         off_t offset,
1285                                         off_t len)
1286 {
1287         struct stream_io *sio =
1288                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1289
1290         DEBUG(10, ("streams_xattr_fallocate called for file %s offset %.0f"
1291                 "len = %.0f\n",
1292                 fsp_str_dbg(fsp), (double)offset, (double)len));
1293
1294         if (sio == NULL) {
1295                 return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
1296         }
1297
1298         if (!streams_xattr_recheck(sio)) {
1299                 return -1;
1300         }
1301
1302         /* Let the pwrite code path handle it. */
1303         errno = ENOSYS;
1304         return -1;
1305 }
1306
1307 static int streams_xattr_fchown(vfs_handle_struct *handle, files_struct *fsp,
1308                                 uid_t uid, gid_t gid)
1309 {
1310         struct stream_io *sio =
1311                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1312
1313         if (sio == NULL) {
1314                 return SMB_VFS_NEXT_FCHOWN(handle, fsp, uid, gid);
1315         }
1316
1317         return 0;
1318 }
1319
1320 static int streams_xattr_fchmod(vfs_handle_struct *handle,
1321                                 files_struct *fsp,
1322                                 mode_t mode)
1323 {
1324         struct stream_io *sio =
1325                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1326
1327         if (sio == NULL) {
1328                 return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
1329         }
1330
1331         return 0;
1332 }
1333
1334 static ssize_t streams_xattr_fgetxattr(struct vfs_handle_struct *handle,
1335                                        struct files_struct *fsp,
1336                                        const char *name,
1337                                        void *value,
1338                                        size_t size)
1339 {
1340         struct stream_io *sio =
1341                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1342
1343         if (sio == NULL) {
1344                 return SMB_VFS_NEXT_FGETXATTR(handle, fsp, name, value, size);
1345         }
1346
1347         errno = ENOTSUP;
1348         return -1;
1349 }
1350
1351 static ssize_t streams_xattr_flistxattr(struct vfs_handle_struct *handle,
1352                                         struct files_struct *fsp,
1353                                         char *list,
1354                                         size_t size)
1355 {
1356         struct stream_io *sio =
1357                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1358
1359         if (sio == NULL) {
1360                 return SMB_VFS_NEXT_FLISTXATTR(handle, fsp, list, size);
1361         }
1362
1363         errno = ENOTSUP;
1364         return -1;
1365 }
1366
1367 static int streams_xattr_fremovexattr(struct vfs_handle_struct *handle,
1368                                       struct files_struct *fsp,
1369                                       const char *name)
1370 {
1371         struct stream_io *sio =
1372                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1373
1374         if (sio == NULL) {
1375                 return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, name);
1376         }
1377
1378         errno = ENOTSUP;
1379         return -1;
1380 }
1381
1382 static int streams_xattr_fsetxattr(struct vfs_handle_struct *handle,
1383                                    struct files_struct *fsp,
1384                                    const char *name,
1385                                    const void *value,
1386                                    size_t size,
1387                                    int flags)
1388 {
1389         struct stream_io *sio =
1390                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1391
1392         if (sio == NULL) {
1393                 return SMB_VFS_NEXT_FSETXATTR(handle, fsp, name, value,
1394                                               size, flags);
1395         }
1396
1397         errno = ENOTSUP;
1398         return -1;
1399 }
1400
1401 struct streams_xattr_fsync_state {
1402         int ret;
1403         struct vfs_aio_state vfs_aio_state;
1404 };
1405
1406 static void streams_xattr_fsync_done(struct tevent_req *subreq);
1407
1408 static struct tevent_req *streams_xattr_fsync_send(
1409         struct vfs_handle_struct *handle,
1410         TALLOC_CTX *mem_ctx,
1411         struct tevent_context *ev,
1412         struct files_struct *fsp)
1413 {
1414         struct tevent_req *req = NULL;
1415         struct tevent_req *subreq = NULL;
1416         struct streams_xattr_fsync_state *state = NULL;
1417         struct stream_io *sio =
1418                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1419
1420         req = tevent_req_create(mem_ctx, &state,
1421                                 struct streams_xattr_fsync_state);
1422         if (req == NULL) {
1423                 return NULL;
1424         }
1425
1426         if (sio == NULL) {
1427                 subreq = SMB_VFS_NEXT_FSYNC_SEND(state, ev, handle, fsp);
1428                 if (tevent_req_nomem(req, subreq)) {
1429                         return tevent_req_post(req, ev);
1430                 }
1431                 tevent_req_set_callback(subreq, streams_xattr_fsync_done, req);
1432                 return req;
1433         }
1434
1435         /*
1436          * There's no pathname based sync variant and we don't have access to
1437          * the basefile handle, so we can't do anything here.
1438          */
1439
1440         tevent_req_done(req);
1441         return tevent_req_post(req, ev);
1442 }
1443
1444 static void streams_xattr_fsync_done(struct tevent_req *subreq)
1445 {
1446         struct tevent_req *req = tevent_req_callback_data(
1447                 subreq, struct tevent_req);
1448         struct streams_xattr_fsync_state *state = tevent_req_data(
1449                 req, struct streams_xattr_fsync_state);
1450
1451         state->ret = SMB_VFS_FSYNC_RECV(subreq, &state->vfs_aio_state);
1452         TALLOC_FREE(subreq);
1453         if (state->ret != 0) {
1454                 tevent_req_error(req, errno);
1455                 return;
1456         }
1457
1458         tevent_req_done(req);
1459 }
1460
1461 static int streams_xattr_fsync_recv(struct tevent_req *req,
1462                                     struct vfs_aio_state *vfs_aio_state)
1463 {
1464         struct streams_xattr_fsync_state *state = tevent_req_data(
1465                 req, struct streams_xattr_fsync_state);
1466
1467         if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
1468                 return -1;
1469         }
1470
1471         *vfs_aio_state = state->vfs_aio_state;
1472         return state->ret;
1473 }
1474
1475 static bool streams_xattr_lock(vfs_handle_struct *handle,
1476                                files_struct *fsp,
1477                                int op,
1478                                off_t offset,
1479                                off_t count,
1480                                int type)
1481 {
1482         struct stream_io *sio =
1483                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1484
1485         if (sio == NULL) {
1486                 return SMB_VFS_NEXT_LOCK(handle, fsp, op, offset, count, type);
1487         }
1488
1489         return true;
1490 }
1491
1492 static bool streams_xattr_getlock(vfs_handle_struct *handle,
1493                                   files_struct *fsp,
1494                                   off_t *poffset,
1495                                   off_t *pcount,
1496                                   int *ptype,
1497                                   pid_t *ppid)
1498 {
1499         struct stream_io *sio =
1500                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1501
1502         if (sio == NULL) {
1503                 return SMB_VFS_NEXT_GETLOCK(handle, fsp, poffset,
1504                                             pcount, ptype, ppid);
1505         }
1506
1507         errno = ENOTSUP;
1508         return false;
1509 }
1510
1511 static int streams_xattr_kernel_flock(vfs_handle_struct *handle,
1512                                       files_struct *fsp,
1513                                       uint32_t share_access,
1514                                       uint32_t access_mask)
1515 {
1516         struct stream_io *sio =
1517                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1518
1519         if (sio == NULL) {
1520                 return SMB_VFS_NEXT_KERNEL_FLOCK(handle, fsp,
1521                                                  share_access, access_mask);
1522         }
1523
1524         return 0;
1525 }
1526
1527 static int streams_xattr_linux_setlease(vfs_handle_struct *handle,
1528                                         files_struct *fsp,
1529                                         int leasetype)
1530 {
1531         struct stream_io *sio =
1532                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1533
1534         if (sio == NULL) {
1535                 return SMB_VFS_NEXT_LINUX_SETLEASE(handle, fsp, leasetype);
1536         }
1537
1538         return 0;
1539 }
1540
1541 static bool streams_xattr_strict_lock_check(struct vfs_handle_struct *handle,
1542                                             files_struct *fsp,
1543                                             struct lock_struct *plock)
1544 {
1545         struct stream_io *sio =
1546                 (struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
1547
1548         if (sio == NULL) {
1549                 return SMB_VFS_NEXT_STRICT_LOCK_CHECK(handle, fsp, plock);
1550         }
1551
1552         return true;
1553 }
1554
1555 static struct vfs_fn_pointers vfs_streams_xattr_fns = {
1556         .fs_capabilities_fn = streams_xattr_fs_capabilities,
1557         .connect_fn = streams_xattr_connect,
1558         .openat_fn = streams_xattr_openat,
1559         .close_fn = streams_xattr_close,
1560         .stat_fn = streams_xattr_stat,
1561         .fstat_fn = streams_xattr_fstat,
1562         .lstat_fn = streams_xattr_lstat,
1563         .pread_fn = streams_xattr_pread,
1564         .pwrite_fn = streams_xattr_pwrite,
1565         .pread_send_fn = streams_xattr_pread_send,
1566         .pread_recv_fn = streams_xattr_pread_recv,
1567         .pwrite_send_fn = streams_xattr_pwrite_send,
1568         .pwrite_recv_fn = streams_xattr_pwrite_recv,
1569         .unlinkat_fn = streams_xattr_unlinkat,
1570         .renameat_fn = streams_xattr_renameat,
1571         .ftruncate_fn = streams_xattr_ftruncate,
1572         .fallocate_fn = streams_xattr_fallocate,
1573         .fstreaminfo_fn = streams_xattr_fstreaminfo,
1574
1575         .fsync_send_fn = streams_xattr_fsync_send,
1576         .fsync_recv_fn = streams_xattr_fsync_recv,
1577
1578         .lock_fn = streams_xattr_lock,
1579         .getlock_fn = streams_xattr_getlock,
1580         .kernel_flock_fn = streams_xattr_kernel_flock,
1581         .linux_setlease_fn = streams_xattr_linux_setlease,
1582         .strict_lock_check_fn = streams_xattr_strict_lock_check,
1583
1584         .fchown_fn = streams_xattr_fchown,
1585         .fchmod_fn = streams_xattr_fchmod,
1586
1587         .fgetxattr_fn = streams_xattr_fgetxattr,
1588         .flistxattr_fn = streams_xattr_flistxattr,
1589         .fremovexattr_fn = streams_xattr_fremovexattr,
1590         .fsetxattr_fn = streams_xattr_fsetxattr,
1591 };
1592
1593 static_decl_vfs;
1594 NTSTATUS vfs_streams_xattr_init(TALLOC_CTX *ctx)
1595 {
1596         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
1597                                 &vfs_streams_xattr_fns);
1598 }