Implement vfs_ea_tdb

This is an option for file systems that do not implement xattrs: in
lockdir/eas.tdb an array of xatts per inode is stored.

It can not solve the problem that xattrs might reappear if a posix-level
process deletes a file and happens to re-create it under the same name. On file
systems with birthtime we might have a chance to detect this, but not with
standard posix. A future version might put relief on file systems that do have
xattrs but where these are severely limited in size/speed/whatever: We can put
a simple marker as a native xattr, but the xattrs proper are stored in the tdb.

Volker
(This used to be commit 2036b4c5ad677b8a477b34b0f076febab0abff5e)

1 files changed, 736 insertions, 0 deletions

diff --git a/source3/modules/vfs_ea_tdb.c b/source3/modules/vfs_ea_tdb.c
new file mode 100644
index 0000000000..8cf04d79ad
--- /dev/null
+++ b/source3/modules/vfs_ea_tdb.c
@@ -0,0 +1,736 @@
+/*
+ * Store posix-level xattrs in a tdb
+ *
+ * Copyright (C) Volker Lendecke, 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 "librpc/gen_ndr/xattr.h"
+#include "librpc/gen_ndr/ndr_xattr.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_VFS
+
+/*
+ * unmarshall tdb_xattrs
+ */
+
+static NTSTATUS ea_tdb_pull_attrs(TALLOC_CTX *mem_ctx,
+				  const TDB_DATA *data,
+				  struct tdb_xattrs **presult)
+{
+	DATA_BLOB blob;
+	enum ndr_err_code ndr_err;
+	struct tdb_xattrs *result;
+
+	if (!(result = TALLOC_ZERO_P(mem_ctx, struct tdb_xattrs))) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	if (data->dsize == 0) {
+		*presult = result;
+		return NT_STATUS_OK;
+	}
+
+	blob = data_blob_const(data->dptr, data->dsize);
+
+	ndr_err = ndr_pull_struct_blob(
+		&blob, result, result,
+		(ndr_pull_flags_fn_t)ndr_pull_tdb_xattrs);
+
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		DEBUG(0, ("ndr_pull_tdb_xattrs failed: %s\n",
+			  ndr_errstr(ndr_err)));
+		TALLOC_FREE(result);
+		return ndr_map_error2ntstatus(ndr_err);;
+	}
+
+	*presult = result;
+	return NT_STATUS_OK;
+}
+
+/*
+ * marshall tdb_xattrs
+ */
+
+static NTSTATUS ea_tdb_push_attrs(TALLOC_CTX *mem_ctx,
+				  const struct tdb_xattrs *attribs,
+				  TDB_DATA *data)
+{
+	DATA_BLOB blob;
+	enum ndr_err_code ndr_err;
+
+	ndr_err = ndr_push_struct_blob(
+		&blob, mem_ctx, attribs,
+		(ndr_push_flags_fn_t)ndr_push_tdb_xattrs);
+
+	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+		DEBUG(0, ("ndr_push_tdb_xattrs failed: %s\n",
+			  ndr_errstr(ndr_err)));
+		return ndr_map_error2ntstatus(ndr_err);;
+	}
+
+	*data = make_tdb_data(blob.data, blob.length);
+	return NT_STATUS_OK;
+}
+
+/*
+ * Load tdb_xattrs for a file from the tdb
+ */
+
+static NTSTATUS ea_tdb_load_attrs(TALLOC_CTX *mem_ctx,
+				  struct db_context *db_ctx,
+				  const struct file_id *id,
+				  struct tdb_xattrs **presult)
+{
+	uint8 id_buf[16];
+	NTSTATUS status;
+	TDB_DATA data;
+
+	push_file_id_16((char *)id_buf, id);
+
+	if (db_ctx->fetch(db_ctx, mem_ctx,
+			  make_tdb_data(id_buf, sizeof(id_buf)),
+			  &data) == -1) {
+		return NT_STATUS_INTERNAL_DB_CORRUPTION;
+	}
+
+	status = ea_tdb_pull_attrs(mem_ctx, &data, presult);
+	TALLOC_FREE(data.dptr);
+	return NT_STATUS_OK;
+}
+
+/*
+ * fetch_lock the tdb_ea record for a file
+ */
+
+static struct db_record *ea_tdb_lock_attrs(TALLOC_CTX *mem_ctx,
+					   struct db_context *db_ctx,
+					   const struct file_id *id)
+{
+	uint8 id_buf[16];
+	push_file_id_16((char *)id_buf, id);
+	return db_ctx->fetch_locked(db_ctx, mem_ctx,
+				    make_tdb_data(id_buf, sizeof(id_buf)));
+}
+
+/*
+ * Save tdb_xattrs to a previously fetch_locked record
+ */
+
+static NTSTATUS ea_tdb_save_attrs(struct db_record *rec,
+				  const struct tdb_xattrs *attribs)
+{
+	TDB_DATA data;
+	NTSTATUS status;
+
+	status = ea_tdb_push_attrs(talloc_tos(), attribs, &data);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0, ("ea_tdb_push_attrs failed: %s\n",
+			  nt_errstr(status)));
+		return status;
+	}
+
+	status = rec->store(rec, data, 0);
+
+	TALLOC_FREE(data.dptr);
+
+	return status;
+}
+
+/*
+ * Worker routine for getxattr and fgetxattr
+ */
+
+static ssize_t ea_tdb_getattr(struct db_context *db_ctx,
+			      const struct file_id *id,
+			      const char *name, void *value, size_t size)
+{
+	struct tdb_xattrs *attribs;
+	uint32_t i;
+	ssize_t result = -1;
+	NTSTATUS status;
+
+	status = ea_tdb_load_attrs(talloc_tos(), db_ctx, id, &attribs);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(10, ("ea_tdb_fetch_attrs failed: %s\n",
+			   nt_errstr(status)));
+		errno = EINVAL;
+		return -1;
+	}
+
+	for (i=0; i<attribs->num_xattrs; i++) {
+		if (strcmp(attribs->xattrs[i].name, name) == 0) {
+			break;
+		}
+	}
+
+	if (i == attribs->num_xattrs) {
+		errno = ENOATTR;
+		goto fail;
+	}
+
+	if (attribs->xattrs[i].value.length > size) {
+		errno = ERANGE;
+		goto fail;
+	}
+
+	memcpy(value, attribs->xattrs[i].value.data,
+	       attribs->xattrs[i].value.length);
+	result = attribs->xattrs[i].value.length;
+
+ fail:
+	TALLOC_FREE(attribs);
+	return result;
+}
+
+static ssize_t ea_tdb_getxattr(struct vfs_handle_struct *handle,
+			       const char *path, const char *name,
+			       void *value, size_t size)
+{
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+	struct db_context *db;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
+
+	if (SMB_VFS_STAT(handle->conn, path, &sbuf) == -1) {
+		return -1;
+	}
+
+	id = SMB_VFS_FILE_ID_CREATE(handle->conn, sbuf.st_dev, sbuf.st_ino);
+
+	return ea_tdb_getattr(db, &id, name, value, size);
+}
+
+static ssize_t ea_tdb_fgetxattr(struct vfs_handle_struct *handle,
+				struct files_struct *fsp,
+				const char *name, void *value, size_t size)
+{
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+	struct db_context *db;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
+
+	if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) {
+		return -1;
+	}
+
+	id = SMB_VFS_FILE_ID_CREATE(handle->conn, sbuf.st_dev, sbuf.st_ino);
+
+	return ea_tdb_getattr(db, &id, name, value, size);
+}
+
+/*
+ * Worker routine for setxattr and fsetxattr
+ */
+
+static int ea_tdb_setattr(struct db_context *db_ctx,
+			  const struct file_id *id, const char *name,
+			  const void *value, size_t size, int flags)
+{
+	NTSTATUS status;
+	struct db_record *rec;
+	struct tdb_xattrs *attribs;
+	uint32_t i;
+
+	rec = ea_tdb_lock_attrs(talloc_tos(), db_ctx, id);
+
+	if (rec == NULL) {
+		DEBUG(0, ("ea_tdb_lock_attrs failed\n"));
+		errno = EINVAL;
+		return -1;
+	}
+
+	status = ea_tdb_pull_attrs(rec, &rec->value, &attribs);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(10, ("ea_tdb_fetch_attrs failed: %s\n",
+			   nt_errstr(status)));
+		TALLOC_FREE(rec);
+		return -1;
+	}
+
+	for (i=0; i<attribs->num_xattrs; i++) {
+		if (strcmp(attribs->xattrs[i].name, name) == 0) {
+			break;
+		}
+	}
+
+	if (i == attribs->num_xattrs) {
+		struct tdb_xattr *tmp;
+
+		tmp = TALLOC_REALLOC_ARRAY(
+			attribs, attribs->xattrs, struct tdb_xattr,
+			attribs->num_xattrs + 1);
+
+		if (tmp == NULL) {
+			DEBUG(0, ("TALLOC_REALLOC_ARRAY failed\n"));
+			TALLOC_FREE(rec);
+			errno = ENOMEM;
+			return -1;
+		}
+
+		attribs->xattrs = tmp;
+		attribs->num_xattrs += 1;
+	}
+
+	attribs->xattrs[i].name = name;
+	attribs->xattrs[i].value.data = CONST_DISCARD(uint8 *, value);
+	attribs->xattrs[i].value.length = size;
+
+	status = ea_tdb_save_attrs(rec, attribs);
+
+	TALLOC_FREE(rec);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("save failed: %s\n", nt_errstr(status)));
+		return -1;
+	}
+
+	return 0;
+}
+
+static int ea_tdb_setxattr(struct vfs_handle_struct *handle,
+			   const char *path, const char *name,
+			   const void *value, size_t size, int flags)
+{
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+	struct db_context *db;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
+
+	if (SMB_VFS_STAT(handle->conn, path, &sbuf) == -1) {
+		return -1;
+	}
+
+	id = SMB_VFS_FILE_ID_CREATE(handle->conn, sbuf.st_dev, sbuf.st_ino);
+
+	return ea_tdb_setattr(db, &id, name, value, size, flags);
+}
+
+static int ea_tdb_fsetxattr(struct vfs_handle_struct *handle,
+			    struct files_struct *fsp,
+			    const char *name, const void *value,
+			    size_t size, int flags)
+{
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+	struct db_context *db;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
+
+	if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) {
+		return -1;
+	}
+
+	id = SMB_VFS_FILE_ID_CREATE(handle->conn, sbuf.st_dev, sbuf.st_ino);
+
+	return ea_tdb_setattr(db, &id, name, value, size, flags);
+}
+
+/*
+ * Worker routine for listxattr and flistxattr
+ */
+
+static ssize_t ea_tdb_listattr(struct db_context *db_ctx,
+			       const struct file_id *id, char *list,
+			       size_t size)
+{
+	NTSTATUS status;
+	struct tdb_xattrs *attribs;
+	uint32_t i;
+	size_t len = 0;
+
+	status = ea_tdb_load_attrs(talloc_tos(), db_ctx, id, &attribs);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(10, ("ea_tdb_fetch_attrs failed: %s\n",
+			   nt_errstr(status)));
+		errno = EINVAL;
+		return -1;
+	}
+
+	DEBUG(10, ("ea_tdb_listattr: Found %d xattrs\n", attribs->num_xattrs));
+
+	for (i=0; i<attribs->num_xattrs; i++) {
+		size_t tmp;
+
+		DEBUG(10, ("ea_tdb_listattr: xattrs[i].name: %s\n",
+			   attribs->xattrs[i].name));
+
+		tmp = strlen(attribs->xattrs[i].name);
+
+		/*
+		 * Try to protect against overflow
+		 */
+
+		if (len + (tmp+1) < len) {
+			TALLOC_FREE(attribs);
+			errno = EINVAL;
+			return -1;
+		}
+
+		/*
+		 * Take care of the terminating NULL
+		 */
+		len += (tmp + 1);
+	}
+
+	if (len > size) {
+		TALLOC_FREE(attribs);
+		errno = ERANGE;
+		return -1;
+	}
+
+	len = 0;
+
+	for (i=0; i<attribs->num_xattrs; i++) {
+		strlcpy(list+len, attribs->xattrs[i].name,
+			size-len);
+		len += (strlen(attribs->xattrs[i].name) + 1);
+	}
+
+	TALLOC_FREE(attribs);
+	return len;
+}
+
+static ssize_t ea_tdb_listxattr(struct vfs_handle_struct *handle,
+				const char *path, char *list, size_t size)
+{
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+	struct db_context *db;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
+
+	if (SMB_VFS_STAT(handle->conn, path, &sbuf) == -1) {
+		return -1;
+	}
+
+	id = SMB_VFS_FILE_ID_CREATE(handle->conn, sbuf.st_dev, sbuf.st_ino);
+
+	return ea_tdb_listattr(db, &id, list, size);
+}
+
+static ssize_t ea_tdb_flistxattr(struct vfs_handle_struct *handle,
+				 struct files_struct *fsp, char *list,
+				 size_t size)
+{
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+	struct db_context *db;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
+
+	if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) {
+		return -1;
+	}
+
+	id = SMB_VFS_FILE_ID_CREATE(handle->conn, sbuf.st_dev, sbuf.st_ino);
+
+	return ea_tdb_listattr(db, &id, list, size);
+}
+
+/*
+ * Worker routine for removexattr and fremovexattr
+ */
+
+static int ea_tdb_removeattr(struct db_context *db_ctx,
+			     const struct file_id *id, const char *name)
+{
+	NTSTATUS status;
+	struct db_record *rec;
+	struct tdb_xattrs *attribs;
+	uint32_t i;
+
+	rec = ea_tdb_lock_attrs(talloc_tos(), db_ctx, id);
+
+	if (rec == NULL) {
+		DEBUG(0, ("ea_tdb_lock_attrs failed\n"));
+		errno = EINVAL;
+		return -1;
+	}
+
+	status = ea_tdb_pull_attrs(rec, &rec->value, &attribs);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(10, ("ea_tdb_fetch_attrs failed: %s\n",
+			   nt_errstr(status)));
+		TALLOC_FREE(rec);
+		return -1;
+	}
+
+	for (i=0; i<attribs->num_xattrs; i++) {
+		if (strcmp(attribs->xattrs[i].name, name) == 0) {
+			break;
+		}
+	}
+
+	if (i == attribs->num_xattrs) {
+		TALLOC_FREE(rec);
+		errno = ENOATTR;
+		return -1;
+	}
+
+	attribs->xattrs[i] =
+		attribs->xattrs[attribs->num_xattrs-1];
+	attribs->num_xattrs -= 1;
+
+	if (attribs->num_xattrs == 0) {
+		rec->delete_rec(rec);
+		TALLOC_FREE(rec);
+		return 0;
+	}
+
+	status = ea_tdb_save_attrs(rec, attribs);
+
+	TALLOC_FREE(rec);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(1, ("save failed: %s\n", nt_errstr(status)));
+		return -1;
+	}
+
+	return 0;
+}
+
+static int ea_tdb_removexattr(struct vfs_handle_struct *handle,
+			      const char *path, const char *name)
+{
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+	struct db_context *db;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
+
+	if (SMB_VFS_STAT(handle->conn, path, &sbuf) == -1) {
+		return -1;
+	}
+
+	id = SMB_VFS_FILE_ID_CREATE(handle->conn, sbuf.st_dev, sbuf.st_ino);
+
+	return ea_tdb_removeattr(db, &id, name);
+}
+
+static int ea_tdb_fremovexattr(struct vfs_handle_struct *handle,
+			       struct files_struct *fsp, const char *name)
+{
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+	struct db_context *db;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
+
+	if (SMB_VFS_FSTAT(fsp, &sbuf) == -1) {
+		return -1;
+	}
+
+	id = SMB_VFS_FILE_ID_CREATE(handle->conn, sbuf.st_dev, sbuf.st_ino);
+
+	return ea_tdb_removeattr(db, &id, name);
+}
+
+/*
+ * Open the tdb file upon VFS_CONNECT
+ */
+
+static bool ea_tdb_init(int snum, struct db_context **p_db)
+{
+	struct db_context *db;
+	const char *dbname;
+
+	dbname = lp_parm_const_string(snum, "ea", "tdb", lock_path("eas.tdb"));
+
+	if (dbname == NULL) {
+		errno = ENOTSUP;
+		return false;
+	}
+
+	become_root();
+	db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600);
+	unbecome_root();
+
+	if (db == NULL) {
+		errno = ENOTSUP;
+		return false;
+	}
+
+	*p_db = db;
+	return true;
+}
+
+/*
+ * On unlink we need to delete the tdb record
+ */
+static int ea_tdb_unlink(vfs_handle_struct *handle, const char *path)
+{
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+	struct db_context *db;
+	struct db_record *rec;
+	int ret;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
+
+	if (SMB_VFS_STAT(handle->conn, path, &sbuf) == -1) {
+		return -1;
+	}
+
+	ret = SMB_VFS_NEXT_UNLINK(handle, path);
+
+	if (ret == -1) {
+		return -1;
+	}
+
+	id = SMB_VFS_FILE_ID_CREATE(handle->conn, sbuf.st_dev, sbuf.st_ino);
+
+	rec = ea_tdb_lock_attrs(talloc_tos(), db, &id);
+
+	/*
+	 * If rec == NULL there's not much we can do about it
+	 */
+
+	if (rec != NULL) {
+		rec->delete_rec(rec);
+		TALLOC_FREE(rec);
+	}
+
+	return 0;
+}
+
+/*
+ * On rmdir we need to delete the tdb record
+ */
+static int ea_tdb_rmdir(vfs_handle_struct *handle, const char *path)
+{
+	SMB_STRUCT_STAT sbuf;
+	struct file_id id;
+	struct db_context *db;
+	struct db_record *rec;
+	int ret;
+
+	SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context, return -1);
+
+	if (SMB_VFS_STAT(handle->conn, path, &sbuf) == -1) {
+		return -1;
+	}
+
+	ret = SMB_VFS_NEXT_RMDIR(handle, path);
+
+	if (ret == -1) {
+		return -1;
+	}
+
+	id = SMB_VFS_FILE_ID_CREATE(handle->conn, sbuf.st_dev, sbuf.st_ino);
+
+	rec = ea_tdb_lock_attrs(talloc_tos(), db, &id);
+
+	/*
+	 * If rec == NULL there's not much we can do about it
+	 */
+
+	if (rec != NULL) {
+		rec->delete_rec(rec);
+		TALLOC_FREE(rec);
+	}
+
+	return 0;
+}
+
+/*
+ * Destructor for the VFS private data
+ */
+
+static void close_ea_db(void **data)
+{
+	struct db_context **p_db = (struct db_context **)data;
+	TALLOC_FREE(*p_db);
+}
+
+static int ea_tdb_connect(vfs_handle_struct *handle, const char *service,
+			  const char *user)
+{
+	fstring sname;
+	int res, snum;
+	struct db_context *db;
+
+	res = SMB_VFS_NEXT_CONNECT(handle, service, user);
+	if (res < 0) {
+		return res;
+	}
+
+	fstrcpy(sname, service);
+	snum = find_service(sname);
+	if (snum == -1) {
+		/*
+		 * Should not happen, but we should not fail just *here*.
+		 */
+		return 0;
+	}
+
+	if (!ea_tdb_init(snum, &db)) {
+		DEBUG(5, ("Could not init ea tdb\n"));
+		lp_do_parameter(snum, "ea support", "False");
+		return 0;
+	}
+
+	lp_do_parameter(snum, "ea support", "True");
+
+	SMB_VFS_HANDLE_SET_DATA(handle, db, close_ea_db,
+				struct db_context, return -1);
+
+	return 0;
+}
+
+/* VFS operations structure */
+
+static const vfs_op_tuple ea_tdb_ops[] = {
+	{SMB_VFS_OP(ea_tdb_getxattr), SMB_VFS_OP_GETXATTR,
+	 SMB_VFS_LAYER_TRANSPARENT},
+	{SMB_VFS_OP(ea_tdb_fgetxattr), SMB_VFS_OP_FGETXATTR,
+	 SMB_VFS_LAYER_TRANSPARENT},
+	{SMB_VFS_OP(ea_tdb_setxattr), SMB_VFS_OP_SETXATTR,
+	 SMB_VFS_LAYER_TRANSPARENT},
+	{SMB_VFS_OP(ea_tdb_fsetxattr), SMB_VFS_OP_FSETXATTR,
+	 SMB_VFS_LAYER_TRANSPARENT},
+	{SMB_VFS_OP(ea_tdb_listxattr), SMB_VFS_OP_LISTXATTR,
+	 SMB_VFS_LAYER_TRANSPARENT},
+	{SMB_VFS_OP(ea_tdb_flistxattr), SMB_VFS_OP_FLISTXATTR,
+	 SMB_VFS_LAYER_TRANSPARENT},
+	{SMB_VFS_OP(ea_tdb_removexattr), SMB_VFS_OP_REMOVEXATTR,
+	 SMB_VFS_LAYER_TRANSPARENT},
+	{SMB_VFS_OP(ea_tdb_fremovexattr), SMB_VFS_OP_FREMOVEXATTR,
+	 SMB_VFS_LAYER_TRANSPARENT},
+	{SMB_VFS_OP(ea_tdb_unlink), SMB_VFS_OP_UNLINK,
+	 SMB_VFS_LAYER_TRANSPARENT},
+	{SMB_VFS_OP(ea_tdb_rmdir), SMB_VFS_OP_RMDIR,
+	 SMB_VFS_LAYER_TRANSPARENT},
+	{SMB_VFS_OP(ea_tdb_connect), SMB_VFS_OP_CONNECT,
+	 SMB_VFS_LAYER_TRANSPARENT},
+	{SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
+};
+
+NTSTATUS vfs_ea_tdb_init(void);
+NTSTATUS vfs_ea_tdb_init(void)
+{
+	return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "ea_tdb",
+				ea_tdb_ops);
+}