Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1614 insertions, 0 deletions

diff --git a/source3/modules/vfs_streams_xattr.c b/source3/modules/vfs_streams_xattr.c
new file mode 100644
index 0000000..03ff614
--- /dev/null
+++ b/source3/modules/vfs_streams_xattr.c
@@ -0,0 +1,1614 @@
+/*
+ * Store streams in xattrs
+ *
+ * Copyright (C) Volker Lendecke, 2008
+ *
+ * Partly based on James Peach's Darwin module, which is
+ *
+ * Copyright (C) James Peach 2006-2007
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "includes.h"
+#include "smbd/smbd.h"
+#include "system/filesys.h"
+#include "lib/util/tevent_unix.h"
+#include "librpc/gen_ndr/ioctl.h"
+#include "hash_inode.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_VFS
+
+struct streams_xattr_config {
+	const char *prefix;
+	size_t prefix_len;
+	bool store_stream_type;
+};
+
+struct stream_io {
+	char *base;
+	char *xattr_name;
+	void *fsp_name_ptr;
+	files_struct *fsp;
+	vfs_handle_struct *handle;
+};
+
+static ssize_t get_xattr_size_fsp(struct files_struct *fsp,
+			          const char *xattr_name)
+{
+	NTSTATUS status;
+	struct ea_struct ea;
+	ssize_t result;
+
+	status = get_ea_value_fsp(talloc_tos(),
+				  fsp,
+				  xattr_name,
+				  &ea);
+	if (!NT_STATUS_IS_OK(status)) {
+		return -1;
+	}
+
+	result = ea.value.length-1;
+	TALLOC_FREE(ea.value.data);
+	return result;
+}
+
+/**
+ * Given a stream name, populate xattr_name with the xattr name to use for
+ * accessing the stream.
+ */
+static NTSTATUS streams_xattr_get_name(vfs_handle_struct *handle,
+				       TALLOC_CTX *ctx,
+				       const char *stream_name,
+				       char **xattr_name)
+{
+	size_t stream_name_len = strlen(stream_name);
+	char *stype;
+	struct streams_xattr_config *config;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
+				return NT_STATUS_UNSUCCESSFUL);
+
+	SMB_ASSERT(stream_name[0] == ':');
+	stream_name += 1;
+
+	/*
+	 * With vfs_fruit option "fruit:encoding = native" we're
+	 * already converting stream names that contain illegal NTFS
+	 * characters from their on-the-wire Unicode Private Range
+	 * encoding to their native ASCII representation.
+	 *
+	 * As as result the name of xattrs storing the streams (via
+	 * vfs_streams_xattr) may contain a colon, so we have to use
+	 * strrchr_m() instead of strchr_m() for matching the stream
+	 * type suffix.
+	 *
+	 * In check_path_syntax() we've already ensured the streamname
+	 * we got from the client is valid.
+	 */
+	stype = strrchr_m(stream_name, ':');
+
+	if (stype) {
+		/*
+		 * We only support one stream type: "$DATA"
+		 */
+		if (strcasecmp_m(stype, ":$DATA") != 0) {
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+
+		/* Split name and type */
+		stream_name_len = (stype - stream_name);
+	}
+
+	*xattr_name = talloc_asprintf(ctx, "%s%.*s%s",
+				      config->prefix,
+				      (int)stream_name_len,
+				      stream_name,
+				      config->store_stream_type ? ":$DATA" : "");
+	if (*xattr_name == NULL) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	DEBUG(10, ("xattr_name: %s, stream_name: %s\n", *xattr_name,
+		   stream_name));
+
+	return NT_STATUS_OK;
+}
+
+static bool streams_xattr_recheck(struct stream_io *sio)
+{
+	NTSTATUS status;
+	char *xattr_name = NULL;
+
+	if (sio->fsp->fsp_name == sio->fsp_name_ptr) {
+		return true;
+	}
+
+	if (sio->fsp->fsp_name->stream_name == NULL) {
+		/* how can this happen */
+		errno = EINVAL;
+		return false;
+	}
+
+	status = streams_xattr_get_name(sio->handle, talloc_tos(),
+					sio->fsp->fsp_name->stream_name,
+					&xattr_name);
+	if (!NT_STATUS_IS_OK(status)) {
+		return false;
+	}
+
+	TALLOC_FREE(sio->xattr_name);
+	TALLOC_FREE(sio->base);
+	sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
+					xattr_name);
+	if (sio->xattr_name == NULL) {
+		DBG_DEBUG("sio->xattr_name==NULL\n");
+		return false;
+	}
+	TALLOC_FREE(xattr_name);
+
+	sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(sio->handle, sio->fsp),
+				  sio->fsp->fsp_name->base_name);
+	if (sio->base == NULL) {
+		DBG_DEBUG("sio->base==NULL\n");
+		return false;
+	}
+
+	sio->fsp_name_ptr = sio->fsp->fsp_name;
+
+	return true;
+}
+
+static int streams_xattr_fstat(vfs_handle_struct *handle, files_struct *fsp,
+			       SMB_STRUCT_STAT *sbuf)
+{
+	int ret = -1;
+	struct stream_io *io = (struct stream_io *)
+		VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	if (io == NULL || !fsp_is_alternate_stream(fsp)) {
+		return SMB_VFS_NEXT_FSTAT(handle, fsp, sbuf);
+	}
+
+	DBG_DEBUG("streams_xattr_fstat called for %s\n", fsp_str_dbg(io->fsp));
+
+	if (!streams_xattr_recheck(io)) {
+		return -1;
+	}
+
+	ret = SMB_VFS_NEXT_FSTAT(handle, fsp->base_fsp, sbuf);
+	if (ret == -1) {
+		return -1;
+	}
+
+	sbuf->st_ex_size = get_xattr_size_fsp(fsp->base_fsp,
+					      io->xattr_name);
+	if (sbuf->st_ex_size == -1) {
+		SET_STAT_INVALID(*sbuf);
+		return -1;
+	}
+
+	DEBUG(10, ("sbuf->st_ex_size = %d\n", (int)sbuf->st_ex_size));
+
+	sbuf->st_ex_ino = hash_inode(sbuf, io->xattr_name);
+	sbuf->st_ex_mode &= ~S_IFMT;
+	sbuf->st_ex_mode &= ~S_IFDIR;
+        sbuf->st_ex_mode |= S_IFREG;
+        sbuf->st_ex_blocks = sbuf->st_ex_size / STAT_ST_BLOCKSIZE + 1;
+
+	return 0;
+}
+
+static int streams_xattr_stat(vfs_handle_struct *handle,
+			      struct smb_filename *smb_fname)
+{
+	NTSTATUS status;
+	int result = -1;
+	char *xattr_name = NULL;
+	char *tmp_stream_name = NULL;
+	struct smb_filename *pathref = NULL;
+	struct files_struct *fsp = smb_fname->fsp;
+
+	if (!is_named_stream(smb_fname)) {
+		return SMB_VFS_NEXT_STAT(handle, smb_fname);
+	}
+
+	/* Note if lp_posix_paths() is true, we can never
+	 * get here as is_named_stream() is
+	 * always false. So we never need worry about
+	 * not following links here. */
+
+	/* Populate the stat struct with info from the base file. */
+	tmp_stream_name = smb_fname->stream_name;
+	smb_fname->stream_name = NULL;
+	result = SMB_VFS_NEXT_STAT(handle, smb_fname);
+	smb_fname->stream_name = tmp_stream_name;
+
+	if (result == -1) {
+		return -1;
+	}
+
+	/* Derive the xattr name to lookup. */
+	status = streams_xattr_get_name(handle, talloc_tos(),
+					smb_fname->stream_name, &xattr_name);
+	if (!NT_STATUS_IS_OK(status)) {
+		errno = map_errno_from_nt_status(status);
+		return -1;
+	}
+
+	/* Augment the base file's stat information before returning. */
+	if (fsp == NULL) {
+		status = synthetic_pathref(talloc_tos(),
+					   handle->conn->cwd_fsp,
+					   smb_fname->base_name,
+					   NULL,
+					   NULL,
+					   smb_fname->twrp,
+					   smb_fname->flags,
+					   &pathref);
+		if (!NT_STATUS_IS_OK(status)) {
+			TALLOC_FREE(xattr_name);
+			SET_STAT_INVALID(smb_fname->st);
+			errno = ENOENT;
+			return -1;
+		}
+		fsp = pathref->fsp;
+	} else {
+		fsp = fsp->base_fsp;
+	}
+
+	smb_fname->st.st_ex_size = get_xattr_size_fsp(fsp,
+						      xattr_name);
+	if (smb_fname->st.st_ex_size == -1) {
+		TALLOC_FREE(xattr_name);
+		TALLOC_FREE(pathref);
+		SET_STAT_INVALID(smb_fname->st);
+		errno = ENOENT;
+		return -1;
+	}
+
+	smb_fname->st.st_ex_ino = hash_inode(&smb_fname->st, xattr_name);
+	smb_fname->st.st_ex_mode &= ~S_IFMT;
+        smb_fname->st.st_ex_mode |= S_IFREG;
+        smb_fname->st.st_ex_blocks =
+	    smb_fname->st.st_ex_size / STAT_ST_BLOCKSIZE + 1;
+
+	TALLOC_FREE(xattr_name);
+	TALLOC_FREE(pathref);
+	return 0;
+}
+
+static int streams_xattr_lstat(vfs_handle_struct *handle,
+			       struct smb_filename *smb_fname)
+{
+	if (is_named_stream(smb_fname)) {
+		/*
+		 * There can never be EA's on a symlink.
+		 * Windows will never see a symlink, and
+		 * in SMB_FILENAME_POSIX_PATH mode we don't
+		 * allow EA's on a symlink.
+		 */
+		SET_STAT_INVALID(smb_fname->st);
+		errno = ENOENT;
+		return -1;
+	}
+	return SMB_VFS_NEXT_LSTAT(handle, smb_fname);
+}
+
+static int streams_xattr_openat(struct vfs_handle_struct *handle,
+				const struct files_struct *dirfsp,
+				const struct smb_filename *smb_fname,
+				files_struct *fsp,
+				const struct vfs_open_how *how)
+{
+	NTSTATUS status;
+	struct streams_xattr_config *config = NULL;
+	struct stream_io *sio = NULL;
+	struct ea_struct ea;
+	char *xattr_name = NULL;
+	int fakefd = -1;
+	bool set_empty_xattr = false;
+	int ret;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
+				return -1);
+
+	DBG_DEBUG("called for %s with flags 0x%x\n",
+		  smb_fname_str_dbg(smb_fname),
+		  how->flags);
+
+	if (!is_named_stream(smb_fname)) {
+		return SMB_VFS_NEXT_OPENAT(handle,
+					   dirfsp,
+					   smb_fname,
+					   fsp,
+					   how);
+	}
+
+	if (how->resolve != 0) {
+		errno = ENOSYS;
+		return -1;
+	}
+
+	SMB_ASSERT(fsp_is_alternate_stream(fsp));
+	SMB_ASSERT(dirfsp == NULL);
+
+	status = streams_xattr_get_name(handle, talloc_tos(),
+					smb_fname->stream_name, &xattr_name);
+	if (!NT_STATUS_IS_OK(status)) {
+		errno = map_errno_from_nt_status(status);
+		goto fail;
+	}
+
+	status = get_ea_value_fsp(talloc_tos(),
+				  fsp->base_fsp,
+				  xattr_name,
+				  &ea);
+
+	DBG_DEBUG("get_ea_value_fsp returned %s\n", nt_errstr(status));
+
+	if (!NT_STATUS_IS_OK(status)) {
+		if (!NT_STATUS_EQUAL(status, NT_STATUS_NOT_FOUND)) {
+			/*
+			 * The base file is not there. This is an error even if
+			 * we got O_CREAT, the higher levels should have created
+			 * the base file for us.
+			 */
+			DBG_DEBUG("streams_xattr_open: base file %s not around, "
+				  "returning ENOENT\n", smb_fname->base_name);
+			errno = ENOENT;
+			goto fail;
+		}
+
+		if (!(how->flags & O_CREAT)) {
+			errno = ENOATTR;
+			goto fail;
+		}
+
+		set_empty_xattr = true;
+	}
+
+	if (how->flags & O_TRUNC) {
+		set_empty_xattr = true;
+	}
+
+	if (set_empty_xattr) {
+		/*
+		 * The attribute does not exist or needs to be truncated
+		 */
+
+		/*
+		 * Darn, xattrs need at least 1 byte
+		 */
+		char null = '\0';
+
+		DEBUG(10, ("creating or truncating attribute %s on file %s\n",
+			   xattr_name, smb_fname->base_name));
+
+		ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
+				       xattr_name,
+				       &null, sizeof(null),
+				       how->flags & O_EXCL ? XATTR_CREATE : 0);
+		if (ret != 0) {
+			goto fail;
+		}
+	}
+
+	fakefd = vfs_fake_fd();
+
+        sio = VFS_ADD_FSP_EXTENSION(handle, fsp, struct stream_io, NULL);
+        if (sio == NULL) {
+                errno = ENOMEM;
+                goto fail;
+        }
+
+        sio->xattr_name = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
+					xattr_name);
+	if (sio->xattr_name == NULL) {
+		errno = ENOMEM;
+		goto fail;
+	}
+
+	/*
+	 * so->base needs to be a copy of fsp->fsp_name->base_name,
+	 * making it identical to streams_xattr_recheck(). If the
+	 * open is changing directories, fsp->fsp_name->base_name
+	 * will be the full path from the share root, whilst
+	 * smb_fname will be relative to the $cwd.
+	 */
+        sio->base = talloc_strdup(VFS_MEMCTX_FSP_EXTENSION(handle, fsp),
+				  fsp->fsp_name->base_name);
+	if (sio->base == NULL) {
+		errno = ENOMEM;
+		goto fail;
+	}
+
+	sio->fsp_name_ptr = fsp->fsp_name;
+	sio->handle = handle;
+	sio->fsp = fsp;
+
+	return fakefd;
+
+ fail:
+	if (fakefd >= 0) {
+		vfs_fake_fd_close(fakefd);
+		fakefd = -1;
+	}
+
+	return -1;
+}
+
+static int streams_xattr_close(vfs_handle_struct *handle,
+			       files_struct *fsp)
+{
+	int ret;
+	int fd;
+
+	fd = fsp_get_pathref_fd(fsp);
+
+	DBG_DEBUG("streams_xattr_close called [%s] fd [%d]\n",
+			smb_fname_str_dbg(fsp->fsp_name), fd);
+
+	if (!fsp_is_alternate_stream(fsp)) {
+		return SMB_VFS_NEXT_CLOSE(handle, fsp);
+	}
+
+	ret = vfs_fake_fd_close(fd);
+	fsp_set_fd(fsp, -1);
+
+	return ret;
+}
+
+static int streams_xattr_unlinkat(vfs_handle_struct *handle,
+			struct files_struct *dirfsp,
+			const struct smb_filename *smb_fname,
+			int flags)
+{
+	NTSTATUS status;
+	int ret = -1;
+	char *xattr_name = NULL;
+	struct smb_filename *pathref = NULL;
+	struct files_struct *fsp = smb_fname->fsp;
+
+	if (!is_named_stream(smb_fname)) {
+		return SMB_VFS_NEXT_UNLINKAT(handle,
+					dirfsp,
+					smb_fname,
+					flags);
+	}
+
+	/* A stream can never be rmdir'ed */
+	SMB_ASSERT((flags & AT_REMOVEDIR) == 0);
+
+	status = streams_xattr_get_name(handle, talloc_tos(),
+					smb_fname->stream_name, &xattr_name);
+	if (!NT_STATUS_IS_OK(status)) {
+		errno = map_errno_from_nt_status(status);
+		goto fail;
+	}
+
+	if (fsp == NULL) {
+		status = synthetic_pathref(talloc_tos(),
+					handle->conn->cwd_fsp,
+					smb_fname->base_name,
+					NULL,
+					NULL,
+					smb_fname->twrp,
+					smb_fname->flags,
+					&pathref);
+		if (!NT_STATUS_IS_OK(status)) {
+			errno = ENOENT;
+			goto fail;
+		}
+		fsp = pathref->fsp;
+	} else {
+		SMB_ASSERT(fsp_is_alternate_stream(smb_fname->fsp));
+		fsp = fsp->base_fsp;
+	}
+
+	ret = SMB_VFS_FREMOVEXATTR(fsp, xattr_name);
+
+	if ((ret == -1) && (errno == ENOATTR)) {
+		errno = ENOENT;
+		goto fail;
+	}
+
+	ret = 0;
+
+ fail:
+	TALLOC_FREE(xattr_name);
+	TALLOC_FREE(pathref);
+	return ret;
+}
+
+static int streams_xattr_renameat(vfs_handle_struct *handle,
+				files_struct *srcfsp,
+				const struct smb_filename *smb_fname_src,
+				files_struct *dstfsp,
+				const struct smb_filename *smb_fname_dst)
+{
+	NTSTATUS status;
+	int ret = -1;
+	char *src_xattr_name = NULL;
+	char *dst_xattr_name = NULL;
+	bool src_is_stream, dst_is_stream;
+	ssize_t oret;
+	ssize_t nret;
+	struct ea_struct ea;
+	struct smb_filename *pathref_src = NULL;
+	struct smb_filename *pathref_dst = NULL;
+	struct smb_filename *full_src = NULL;
+	struct smb_filename *full_dst = NULL;
+
+	src_is_stream = is_ntfs_stream_smb_fname(smb_fname_src);
+	dst_is_stream = is_ntfs_stream_smb_fname(smb_fname_dst);
+
+	if (!src_is_stream && !dst_is_stream) {
+		return SMB_VFS_NEXT_RENAMEAT(handle,
+					srcfsp,
+					smb_fname_src,
+					dstfsp,
+					smb_fname_dst);
+	}
+
+	/* For now don't allow renames from or to the default stream. */
+	if (is_ntfs_default_stream_smb_fname(smb_fname_src) ||
+	    is_ntfs_default_stream_smb_fname(smb_fname_dst)) {
+		errno = ENOSYS;
+		goto done;
+	}
+
+	/* Don't rename if the streams are identical. */
+	if (strcasecmp_m(smb_fname_src->stream_name,
+		       smb_fname_dst->stream_name) == 0) {
+		goto done;
+	}
+
+	/* Get the xattr names. */
+	status = streams_xattr_get_name(handle, talloc_tos(),
+					smb_fname_src->stream_name,
+					&src_xattr_name);
+	if (!NT_STATUS_IS_OK(status)) {
+		errno = map_errno_from_nt_status(status);
+		goto fail;
+	}
+	status = streams_xattr_get_name(handle, talloc_tos(),
+					smb_fname_dst->stream_name,
+					&dst_xattr_name);
+	if (!NT_STATUS_IS_OK(status)) {
+		errno = map_errno_from_nt_status(status);
+		goto fail;
+	}
+
+	full_src = full_path_from_dirfsp_atname(talloc_tos(),
+						srcfsp,
+						smb_fname_src);
+	if (full_src == NULL) {
+		errno = ENOMEM;
+		goto fail;
+	}
+	full_dst = full_path_from_dirfsp_atname(talloc_tos(),
+						dstfsp,
+						smb_fname_dst);
+	if (full_dst == NULL) {
+		errno = ENOMEM;
+		goto fail;
+	}
+
+	/* Get a pathref for full_src (base file, no stream name). */
+	status = synthetic_pathref(talloc_tos(),
+				handle->conn->cwd_fsp,
+				full_src->base_name,
+				NULL,
+				NULL,
+				full_src->twrp,
+				full_src->flags,
+				&pathref_src);
+	if (!NT_STATUS_IS_OK(status)) {
+		errno = ENOENT;
+		goto fail;
+	}
+
+	/* Read the old stream from the base file fsp. */
+	status = get_ea_value_fsp(talloc_tos(),
+				  pathref_src->fsp,
+				  src_xattr_name,
+				  &ea);
+	if (!NT_STATUS_IS_OK(status)) {
+		errno = map_errno_from_nt_status(status);
+		goto fail;
+	}
+
+	/* Get a pathref for full_dst (base file, no stream name). */
+	status = synthetic_pathref(talloc_tos(),
+				handle->conn->cwd_fsp,
+				full_dst->base_name,
+				NULL,
+				NULL,
+				full_dst->twrp,
+				full_dst->flags,
+				&pathref_dst);
+	if (!NT_STATUS_IS_OK(status)) {
+		errno = ENOENT;
+		goto fail;
+	}
+
+	/* (Over)write the new stream on the base file fsp. */
+	nret = SMB_VFS_FSETXATTR(
+			pathref_dst->fsp,
+			dst_xattr_name,
+			ea.value.data,
+			ea.value.length,
+			0);
+	if (nret < 0) {
+		if (errno == ENOATTR) {
+			errno = ENOENT;
+		}
+		goto fail;
+	}
+
+	/*
+	 * Remove the old stream from the base file fsp.
+	 */
+	oret = SMB_VFS_FREMOVEXATTR(pathref_src->fsp,
+				    src_xattr_name);
+	if (oret < 0) {
+		if (errno == ENOATTR) {
+			errno = ENOENT;
+		}
+		goto fail;
+	}
+
+ done:
+	errno = 0;
+	ret = 0;
+ fail:
+	TALLOC_FREE(pathref_src);
+	TALLOC_FREE(pathref_dst);
+	TALLOC_FREE(full_src);
+	TALLOC_FREE(full_dst);
+	TALLOC_FREE(src_xattr_name);
+	TALLOC_FREE(dst_xattr_name);
+	return ret;
+}
+
+static NTSTATUS walk_xattr_streams(vfs_handle_struct *handle,
+				files_struct *fsp,
+				const struct smb_filename *smb_fname,
+				bool (*fn)(struct ea_struct *ea,
+					void *private_data),
+				void *private_data)
+{
+	NTSTATUS status;
+	char **names;
+	size_t i, num_names;
+	struct streams_xattr_config *config;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, config, struct streams_xattr_config,
+				return NT_STATUS_UNSUCCESSFUL);
+
+	status = get_ea_names_from_fsp(talloc_tos(),
+				smb_fname->fsp,
+				&names,
+				&num_names);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	for (i=0; i<num_names; i++) {
+		struct ea_struct ea;
+
+		/*
+		 * We want to check with samba_private_attr_name()
+		 * whether the xattr name is a private one,
+		 * unfortunately it flags xattrs that begin with the
+		 * default streams prefix as private.
+		 *
+		 * By only calling samba_private_attr_name() in case
+		 * the xattr does NOT begin with the default prefix,
+		 * we know that if it returns 'true' it definitely one
+		 * of our internal xattr like "user.DOSATTRIB".
+		 */
+		if (strncasecmp_m(names[i], SAMBA_XATTR_DOSSTREAM_PREFIX,
+				  strlen(SAMBA_XATTR_DOSSTREAM_PREFIX)) != 0) {
+			if (samba_private_attr_name(names[i])) {
+				continue;
+			}
+		}
+
+		if (strncmp(names[i], config->prefix,
+			    config->prefix_len) != 0) {
+			continue;
+		}
+
+		status = get_ea_value_fsp(names,
+					  smb_fname->fsp,
+					  names[i],
+					  &ea);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(10, ("Could not get ea %s for file %s: %s\n",
+				names[i],
+				smb_fname->base_name,
+				nt_errstr(status)));
+			continue;
+		}
+
+		ea.name = talloc_asprintf(
+			ea.value.data, ":%s%s",
+			names[i] + config->prefix_len,
+			config->store_stream_type ? "" : ":$DATA");
+		if (ea.name == NULL) {
+			DEBUG(0, ("talloc failed\n"));
+			continue;
+		}
+
+		if (!fn(&ea, private_data)) {
+			TALLOC_FREE(ea.value.data);
+			return NT_STATUS_OK;
+		}
+
+		TALLOC_FREE(ea.value.data);
+	}
+
+	TALLOC_FREE(names);
+	return NT_STATUS_OK;
+}
+
+static bool add_one_stream(TALLOC_CTX *mem_ctx, unsigned int *num_streams,
+			   struct stream_struct **streams,
+			   const char *name, off_t size,
+			   off_t alloc_size)
+{
+	struct stream_struct *tmp;
+
+	tmp = talloc_realloc(mem_ctx, *streams, struct stream_struct,
+				   (*num_streams)+1);
+	if (tmp == NULL) {
+		return false;
+	}
+
+	tmp[*num_streams].name = talloc_strdup(tmp, name);
+	if (tmp[*num_streams].name == NULL) {
+		return false;
+	}
+
+	tmp[*num_streams].size = size;
+	tmp[*num_streams].alloc_size = alloc_size;
+
+	*streams = tmp;
+	*num_streams += 1;
+	return true;
+}
+
+struct streaminfo_state {
+	TALLOC_CTX *mem_ctx;
+	vfs_handle_struct *handle;
+	unsigned int num_streams;
+	struct stream_struct *streams;
+	NTSTATUS status;
+};
+
+static bool collect_one_stream(struct ea_struct *ea, void *private_data)
+{
+	struct streaminfo_state *state =
+		(struct streaminfo_state *)private_data;
+
+	if (!add_one_stream(state->mem_ctx,
+			    &state->num_streams, &state->streams,
+			    ea->name, ea->value.length-1,
+			    smb_roundup(state->handle->conn,
+					ea->value.length-1))) {
+		state->status = NT_STATUS_NO_MEMORY;
+		return false;
+	}
+
+	return true;
+}
+
+static NTSTATUS streams_xattr_fstreaminfo(vfs_handle_struct *handle,
+					 struct files_struct *fsp,
+					 TALLOC_CTX *mem_ctx,
+					 unsigned int *pnum_streams,
+					 struct stream_struct **pstreams)
+{
+	NTSTATUS status;
+	struct streaminfo_state state;
+
+	state.streams = *pstreams;
+	state.num_streams = *pnum_streams;
+	state.mem_ctx = mem_ctx;
+	state.handle = handle;
+	state.status = NT_STATUS_OK;
+
+	status = walk_xattr_streams(handle,
+				    fsp,
+				    fsp->fsp_name,
+				    collect_one_stream,
+				    &state);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		TALLOC_FREE(state.streams);
+		return status;
+	}
+
+	if (!NT_STATUS_IS_OK(state.status)) {
+		TALLOC_FREE(state.streams);
+		return state.status;
+	}
+
+	*pnum_streams = state.num_streams;
+	*pstreams = state.streams;
+
+	return SMB_VFS_NEXT_FSTREAMINFO(handle,
+			fsp,
+			mem_ctx,
+			pnum_streams,
+			pstreams);
+}
+
+static uint32_t streams_xattr_fs_capabilities(struct vfs_handle_struct *handle,
+			enum timestamp_set_resolution *p_ts_res)
+{
+	return SMB_VFS_NEXT_FS_CAPABILITIES(handle, p_ts_res) | FILE_NAMED_STREAMS;
+}
+
+static int streams_xattr_connect(vfs_handle_struct *handle,
+				 const char *service, const char *user)
+{
+	struct streams_xattr_config *config;
+	const char *default_prefix = SAMBA_XATTR_DOSSTREAM_PREFIX;
+	const char *prefix;
+	int rc;
+
+	rc = SMB_VFS_NEXT_CONNECT(handle, service, user);
+	if (rc != 0) {
+		return rc;
+	}
+
+	config = talloc_zero(handle->conn, struct streams_xattr_config);
+	if (config == NULL) {
+		DEBUG(1, ("talloc_zero() failed\n"));
+		errno = ENOMEM;
+		return -1;
+	}
+
+	prefix = lp_parm_const_string(SNUM(handle->conn),
+				      "streams_xattr", "prefix",
+				      default_prefix);
+	config->prefix = talloc_strdup(config, prefix);
+	if (config->prefix == NULL) {
+		DEBUG(1, ("talloc_strdup() failed\n"));
+		errno = ENOMEM;
+		return -1;
+	}
+	config->prefix_len = strlen(config->prefix);
+	DEBUG(10, ("streams_xattr using stream prefix: %s\n", config->prefix));
+
+	config->store_stream_type = lp_parm_bool(SNUM(handle->conn),
+						 "streams_xattr",
+						 "store_stream_type",
+						 true);
+
+	SMB_VFS_HANDLE_SET_DATA(handle, config,
+				NULL, struct stream_xattr_config,
+				return -1);
+
+	return 0;
+}
+
+static ssize_t streams_xattr_pwrite(vfs_handle_struct *handle,
+				    files_struct *fsp, const void *data,
+				    size_t n, off_t offset)
+{
+        struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+	struct ea_struct ea;
+	NTSTATUS status;
+	int ret;
+
+	DEBUG(10, ("streams_xattr_pwrite called for %d bytes\n", (int)n));
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
+	}
+
+	if (!streams_xattr_recheck(sio)) {
+		return -1;
+	}
+
+	if ((offset + n) >= lp_smbd_max_xattr_size(SNUM(handle->conn))) {
+		/*
+		 * Requested write is beyond what can be read based on
+		 * samba configuration.
+		 * ReFS returns STATUS_FILESYSTEM_LIMITATION, which causes
+		 * entire file to be skipped by File Explorer. VFAT returns
+		 * NT_STATUS_OBJECT_NAME_COLLISION causes user to be prompted
+		 * to skip writing metadata, but copy data.
+		 */
+		DBG_ERR("Write to xattr [%s] on file [%s] exceeds maximum "
+			"supported extended attribute size. "
+			"Depending on filesystem type and operating system "
+			"(OS) specifics, this value may be increased using "
+			"the value of the parameter: "
+			"smbd max xattr size = <bytes>. Consult OS and "
+			"filesystem manpages prior to increasing this limit.\n",
+			sio->xattr_name, sio->base);
+		errno = EOVERFLOW;
+		return -1;
+	}
+
+	status = get_ea_value_fsp(talloc_tos(),
+				  fsp->base_fsp,
+				  sio->xattr_name,
+				  &ea);
+	if (!NT_STATUS_IS_OK(status)) {
+		return -1;
+	}
+
+        if ((offset + n) > ea.value.length-1) {
+		uint8_t *tmp;
+
+		tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
+					   offset + n + 1);
+
+		if (tmp == NULL) {
+			TALLOC_FREE(ea.value.data);
+                        errno = ENOMEM;
+                        return -1;
+                }
+		ea.value.data = tmp;
+		ea.value.length = offset + n + 1;
+		ea.value.data[offset+n] = 0;
+        }
+
+        memcpy(ea.value.data + offset, data, n);
+
+	ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
+				sio->xattr_name,
+				ea.value.data,
+				ea.value.length,
+				0);
+	TALLOC_FREE(ea.value.data);
+
+	if (ret == -1) {
+		return -1;
+	}
+
+	return n;
+}
+
+static ssize_t streams_xattr_pread(vfs_handle_struct *handle,
+				   files_struct *fsp, void *data,
+				   size_t n, off_t offset)
+{
+        struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+	struct ea_struct ea;
+	NTSTATUS status;
+	size_t length, overlap;
+
+	DEBUG(10, ("streams_xattr_pread: offset=%d, size=%d\n",
+		   (int)offset, (int)n));
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_PREAD(handle, fsp, data, n, offset);
+	}
+
+	if (!streams_xattr_recheck(sio)) {
+		return -1;
+	}
+
+	status = get_ea_value_fsp(talloc_tos(),
+				  fsp->base_fsp,
+				  sio->xattr_name,
+				  &ea);
+	if (!NT_STATUS_IS_OK(status)) {
+		return -1;
+	}
+
+	length = ea.value.length-1;
+
+	DBG_DEBUG("get_ea_value_fsp returned %d bytes\n",
+		   (int)length);
+
+        /* Attempt to read past EOF. */
+        if (length <= offset) {
+                return 0;
+        }
+
+        overlap = (offset + n) > length ? (length - offset) : n;
+        memcpy(data, ea.value.data + offset, overlap);
+
+	TALLOC_FREE(ea.value.data);
+        return overlap;
+}
+
+struct streams_xattr_pread_state {
+	ssize_t nread;
+	struct vfs_aio_state vfs_aio_state;
+};
+
+static void streams_xattr_pread_done(struct tevent_req *subreq);
+
+static struct tevent_req *streams_xattr_pread_send(
+	struct vfs_handle_struct *handle,
+	TALLOC_CTX *mem_ctx,
+	struct tevent_context *ev,
+	struct files_struct *fsp,
+	void *data,
+	size_t n, off_t offset)
+{
+	struct tevent_req *req = NULL;
+	struct tevent_req *subreq = NULL;
+	struct streams_xattr_pread_state *state = NULL;
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct streams_xattr_pread_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	if (sio == NULL) {
+		subreq = SMB_VFS_NEXT_PREAD_SEND(state, ev, handle, fsp,
+						 data, n, offset);
+		if (tevent_req_nomem(req, subreq)) {
+			return tevent_req_post(req, ev);
+		}
+		tevent_req_set_callback(subreq, streams_xattr_pread_done, req);
+		return req;
+	}
+
+	state->nread = SMB_VFS_PREAD(fsp, data, n, offset);
+	if (state->nread != n) {
+		if (state->nread != -1) {
+			errno = EIO;
+		}
+		tevent_req_error(req, errno);
+		return tevent_req_post(req, ev);
+	}
+
+	tevent_req_done(req);
+	return tevent_req_post(req, ev);
+}
+
+static void streams_xattr_pread_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct streams_xattr_pread_state *state = tevent_req_data(
+		req, struct streams_xattr_pread_state);
+
+	state->nread = SMB_VFS_PREAD_RECV(subreq, &state->vfs_aio_state);
+	TALLOC_FREE(subreq);
+
+	if (tevent_req_error(req, state->vfs_aio_state.error)) {
+		return;
+	}
+	tevent_req_done(req);
+}
+
+static ssize_t streams_xattr_pread_recv(struct tevent_req *req,
+					struct vfs_aio_state *vfs_aio_state)
+{
+	struct streams_xattr_pread_state *state = tevent_req_data(
+		req, struct streams_xattr_pread_state);
+
+	if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
+		return -1;
+	}
+
+	*vfs_aio_state = state->vfs_aio_state;
+	return state->nread;
+}
+
+struct streams_xattr_pwrite_state {
+	ssize_t nwritten;
+	struct vfs_aio_state vfs_aio_state;
+};
+
+static void streams_xattr_pwrite_done(struct tevent_req *subreq);
+
+static struct tevent_req *streams_xattr_pwrite_send(
+	struct vfs_handle_struct *handle,
+	TALLOC_CTX *mem_ctx,
+	struct tevent_context *ev,
+	struct files_struct *fsp,
+	const void *data,
+	size_t n, off_t offset)
+{
+	struct tevent_req *req = NULL;
+	struct tevent_req *subreq = NULL;
+	struct streams_xattr_pwrite_state *state = NULL;
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct streams_xattr_pwrite_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	if (sio == NULL) {
+		subreq = SMB_VFS_NEXT_PWRITE_SEND(state, ev, handle, fsp,
+						  data, n, offset);
+		if (tevent_req_nomem(req, subreq)) {
+			return tevent_req_post(req, ev);
+		}
+		tevent_req_set_callback(subreq, streams_xattr_pwrite_done, req);
+		return req;
+	}
+
+	state->nwritten = SMB_VFS_PWRITE(fsp, data, n, offset);
+	if (state->nwritten != n) {
+		if (state->nwritten != -1) {
+			errno = EIO;
+		}
+		tevent_req_error(req, errno);
+		return tevent_req_post(req, ev);
+	}
+
+	tevent_req_done(req);
+	return tevent_req_post(req, ev);
+}
+
+static void streams_xattr_pwrite_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct streams_xattr_pwrite_state *state = tevent_req_data(
+		req, struct streams_xattr_pwrite_state);
+
+	state->nwritten = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
+	TALLOC_FREE(subreq);
+
+	if (tevent_req_error(req, state->vfs_aio_state.error)) {
+		return;
+	}
+	tevent_req_done(req);
+}
+
+static ssize_t streams_xattr_pwrite_recv(struct tevent_req *req,
+					 struct vfs_aio_state *vfs_aio_state)
+{
+	struct streams_xattr_pwrite_state *state = tevent_req_data(
+		req, struct streams_xattr_pwrite_state);
+
+	if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
+		return -1;
+	}
+
+	*vfs_aio_state = state->vfs_aio_state;
+	return state->nwritten;
+}
+
+static int streams_xattr_ftruncate(struct vfs_handle_struct *handle,
+					struct files_struct *fsp,
+					off_t offset)
+{
+	int ret;
+	uint8_t *tmp;
+	struct ea_struct ea;
+	NTSTATUS status;
+        struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	DEBUG(10, ("streams_xattr_ftruncate called for file %s offset %.0f\n",
+		   fsp_str_dbg(fsp), (double)offset));
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_FTRUNCATE(handle, fsp, offset);
+	}
+
+	if (!streams_xattr_recheck(sio)) {
+		return -1;
+	}
+
+	status = get_ea_value_fsp(talloc_tos(),
+				  fsp->base_fsp,
+				  sio->xattr_name,
+				  &ea);
+	if (!NT_STATUS_IS_OK(status)) {
+		return -1;
+	}
+
+	tmp = talloc_realloc(talloc_tos(), ea.value.data, uint8_t,
+				   offset + 1);
+
+	if (tmp == NULL) {
+		TALLOC_FREE(ea.value.data);
+		errno = ENOMEM;
+		return -1;
+	}
+
+	/* Did we expand ? */
+	if (ea.value.length < offset + 1) {
+		memset(&tmp[ea.value.length], '\0',
+			offset + 1 - ea.value.length);
+	}
+
+	ea.value.data = tmp;
+	ea.value.length = offset + 1;
+	ea.value.data[offset] = 0;
+
+	ret = SMB_VFS_FSETXATTR(fsp->base_fsp,
+				sio->xattr_name,
+				ea.value.data,
+				ea.value.length,
+				0);
+
+	TALLOC_FREE(ea.value.data);
+
+	if (ret == -1) {
+		return -1;
+	}
+
+	return 0;
+}
+
+static int streams_xattr_fallocate(struct vfs_handle_struct *handle,
+					struct files_struct *fsp,
+					uint32_t mode,
+					off_t offset,
+					off_t len)
+{
+        struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	DEBUG(10, ("streams_xattr_fallocate called for file %s offset %.0f"
+		"len = %.0f\n",
+		fsp_str_dbg(fsp), (double)offset, (double)len));
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_FALLOCATE(handle, fsp, mode, offset, len);
+	}
+
+	if (!streams_xattr_recheck(sio)) {
+		return -1;
+	}
+
+	/* Let the pwrite code path handle it. */
+	errno = ENOSYS;
+	return -1;
+}
+
+static int streams_xattr_fchown(vfs_handle_struct *handle, files_struct *fsp,
+				uid_t uid, gid_t gid)
+{
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_FCHOWN(handle, fsp, uid, gid);
+	}
+
+	return 0;
+}
+
+static int streams_xattr_fchmod(vfs_handle_struct *handle,
+				files_struct *fsp,
+				mode_t mode)
+{
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
+	}
+
+	return 0;
+}
+
+static ssize_t streams_xattr_fgetxattr(struct vfs_handle_struct *handle,
+				       struct files_struct *fsp,
+				       const char *name,
+				       void *value,
+				       size_t size)
+{
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_FGETXATTR(handle, fsp, name, value, size);
+	}
+
+	errno = ENOTSUP;
+	return -1;
+}
+
+static ssize_t streams_xattr_flistxattr(struct vfs_handle_struct *handle,
+					struct files_struct *fsp,
+					char *list,
+					size_t size)
+{
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_FLISTXATTR(handle, fsp, list, size);
+	}
+
+	errno = ENOTSUP;
+	return -1;
+}
+
+static int streams_xattr_fremovexattr(struct vfs_handle_struct *handle,
+				      struct files_struct *fsp,
+				      const char *name)
+{
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_FREMOVEXATTR(handle, fsp, name);
+	}
+
+	errno = ENOTSUP;
+	return -1;
+}
+
+static int streams_xattr_fsetxattr(struct vfs_handle_struct *handle,
+				   struct files_struct *fsp,
+				   const char *name,
+				   const void *value,
+				   size_t size,
+				   int flags)
+{
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_FSETXATTR(handle, fsp, name, value,
+					      size, flags);
+	}
+
+	errno = ENOTSUP;
+	return -1;
+}
+
+struct streams_xattr_fsync_state {
+	int ret;
+	struct vfs_aio_state vfs_aio_state;
+};
+
+static void streams_xattr_fsync_done(struct tevent_req *subreq);
+
+static struct tevent_req *streams_xattr_fsync_send(
+	struct vfs_handle_struct *handle,
+	TALLOC_CTX *mem_ctx,
+	struct tevent_context *ev,
+	struct files_struct *fsp)
+{
+	struct tevent_req *req = NULL;
+	struct tevent_req *subreq = NULL;
+	struct streams_xattr_fsync_state *state = NULL;
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct streams_xattr_fsync_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	if (sio == NULL) {
+		subreq = SMB_VFS_NEXT_FSYNC_SEND(state, ev, handle, fsp);
+		if (tevent_req_nomem(req, subreq)) {
+			return tevent_req_post(req, ev);
+		}
+		tevent_req_set_callback(subreq, streams_xattr_fsync_done, req);
+		return req;
+	}
+
+	/*
+	 * There's no pathname based sync variant and we don't have access to
+	 * the basefile handle, so we can't do anything here.
+	 */
+
+	tevent_req_done(req);
+	return tevent_req_post(req, ev);
+}
+
+static void streams_xattr_fsync_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct streams_xattr_fsync_state *state = tevent_req_data(
+		req, struct streams_xattr_fsync_state);
+
+	state->ret = SMB_VFS_FSYNC_RECV(subreq, &state->vfs_aio_state);
+	TALLOC_FREE(subreq);
+	if (state->ret != 0) {
+		tevent_req_error(req, errno);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+static int streams_xattr_fsync_recv(struct tevent_req *req,
+				    struct vfs_aio_state *vfs_aio_state)
+{
+	struct streams_xattr_fsync_state *state = tevent_req_data(
+		req, struct streams_xattr_fsync_state);
+
+	if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
+		return -1;
+	}
+
+	*vfs_aio_state = state->vfs_aio_state;
+	return state->ret;
+}
+
+static bool streams_xattr_lock(vfs_handle_struct *handle,
+			       files_struct *fsp,
+			       int op,
+			       off_t offset,
+			       off_t count,
+			       int type)
+{
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_LOCK(handle, fsp, op, offset, count, type);
+	}
+
+	return true;
+}
+
+static bool streams_xattr_getlock(vfs_handle_struct *handle,
+				  files_struct *fsp,
+				  off_t *poffset,
+				  off_t *pcount,
+				  int *ptype,
+				  pid_t *ppid)
+{
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_GETLOCK(handle, fsp, poffset,
+					    pcount, ptype, ppid);
+	}
+
+	errno = ENOTSUP;
+	return false;
+}
+
+static int streams_xattr_filesystem_sharemode(vfs_handle_struct *handle,
+					      files_struct *fsp,
+					      uint32_t share_access,
+					      uint32_t access_mask)
+{
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_FILESYSTEM_SHAREMODE(handle,
+							 fsp,
+							 share_access,
+							 access_mask);
+	}
+
+	return 0;
+}
+
+static int streams_xattr_linux_setlease(vfs_handle_struct *handle,
+					files_struct *fsp,
+					int leasetype)
+{
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_LINUX_SETLEASE(handle, fsp, leasetype);
+	}
+
+	return 0;
+}
+
+static bool streams_xattr_strict_lock_check(struct vfs_handle_struct *handle,
+					    files_struct *fsp,
+					    struct lock_struct *plock)
+{
+	struct stream_io *sio =
+		(struct stream_io *)VFS_FETCH_FSP_EXTENSION(handle, fsp);
+
+	if (sio == NULL) {
+		return SMB_VFS_NEXT_STRICT_LOCK_CHECK(handle, fsp, plock);
+	}
+
+	return true;
+}
+
+static int streams_xattr_fcntl(vfs_handle_struct *handle,
+			       files_struct *fsp,
+			       int cmd,
+			       va_list cmd_arg)
+{
+	va_list dup_cmd_arg;
+	void *arg;
+	int ret;
+
+	if (fsp_is_alternate_stream(fsp)) {
+		switch (cmd) {
+		case F_GETFL:
+		case F_SETFL:
+			break;
+		default:
+			DBG_ERR("Unsupported fcntl() cmd [%d] on [%s]\n",
+				cmd, fsp_str_dbg(fsp));
+			errno = EINVAL;
+			return -1;
+		}
+	}
+
+	va_copy(dup_cmd_arg, cmd_arg);
+	arg = va_arg(dup_cmd_arg, void *);
+
+	ret = SMB_VFS_NEXT_FCNTL(handle, fsp, cmd, arg);
+
+	va_end(dup_cmd_arg);
+
+	return ret;
+}
+
+static struct vfs_fn_pointers vfs_streams_xattr_fns = {
+	.fs_capabilities_fn = streams_xattr_fs_capabilities,
+	.connect_fn = streams_xattr_connect,
+	.openat_fn = streams_xattr_openat,
+	.close_fn = streams_xattr_close,
+	.stat_fn = streams_xattr_stat,
+	.fstat_fn = streams_xattr_fstat,
+	.lstat_fn = streams_xattr_lstat,
+	.pread_fn = streams_xattr_pread,
+	.pwrite_fn = streams_xattr_pwrite,
+	.pread_send_fn = streams_xattr_pread_send,
+	.pread_recv_fn = streams_xattr_pread_recv,
+	.pwrite_send_fn = streams_xattr_pwrite_send,
+	.pwrite_recv_fn = streams_xattr_pwrite_recv,
+	.unlinkat_fn = streams_xattr_unlinkat,
+	.renameat_fn = streams_xattr_renameat,
+	.ftruncate_fn = streams_xattr_ftruncate,
+	.fallocate_fn = streams_xattr_fallocate,
+	.fstreaminfo_fn = streams_xattr_fstreaminfo,
+
+	.fsync_send_fn = streams_xattr_fsync_send,
+	.fsync_recv_fn = streams_xattr_fsync_recv,
+
+	.lock_fn = streams_xattr_lock,
+	.getlock_fn = streams_xattr_getlock,
+	.filesystem_sharemode_fn = streams_xattr_filesystem_sharemode,
+	.linux_setlease_fn = streams_xattr_linux_setlease,
+	.strict_lock_check_fn = streams_xattr_strict_lock_check,
+	.fcntl_fn = streams_xattr_fcntl,
+
+	.fchown_fn = streams_xattr_fchown,
+	.fchmod_fn = streams_xattr_fchmod,
+
+	.fgetxattr_fn = streams_xattr_fgetxattr,
+	.flistxattr_fn = streams_xattr_flistxattr,
+	.fremovexattr_fn = streams_xattr_fremovexattr,
+	.fsetxattr_fn = streams_xattr_fsetxattr,
+};
+
+static_decl_vfs;
+NTSTATUS vfs_streams_xattr_init(TALLOC_CTX *ctx)
+{
+	return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "streams_xattr",
+				&vfs_streams_xattr_fns);
+}