Add empty template for BITLK device type.

Also add DM_ZERO type for multi-segment mapping.

lib/bitlk/bitlk.c

@@ -0,0 +1,93 @@
+/*
+ * BITLK (BitLocker-compatible) volume handling
+ *
+ * Copyright (C) 2019 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2019 Milan Broz
+ *
+ * This file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This file 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <assert.h>
+
+#include "libcryptsetup.h"
+#include "bitlk.h"
+#include "internal.h"
+
+int BITLK_read_sb(struct crypt_device *cd, struct crypt_params_bitlk *params)
+{
+	int devfd;
+
+	devfd = device_open(cd, crypt_data_device(cd), O_RDONLY);
+	if(devfd < 0)
+		return -EINVAL;
+
+	return 0;
+}
+
+int BITLK_dump(struct crypt_device *cd, struct device *device)
+{
+	log_std(cd, "Info for BITLK device %s.\n", device_path(device));
+	return 0;
+}
+
+int BITLK_activate(struct crypt_device *cd,
+		   const char *name,
+		   const char *password,
+		   size_t passwordLen,
+		   const struct crypt_params_bitlk *params,
+		   uint32_t flags)
+{
+	int r;
+	struct crypt_dm_active_device dmd = {
+		.flags = flags,
+	};
+
+	/* FIXME: Password verify only */
+	if (!name)
+		return -EINVAL;
+
+	r = device_block_adjust(cd, crypt_data_device(cd), DEV_EXCL,
+				crypt_get_data_offset(cd), &dmd.size, &dmd.flags);
+	if (r)
+		return r;
+
+	/* FIXME: Example - two segments device */
+	r = dm_targets_allocate(&dmd.segment, 2);
+	if (r)
+		goto out;
+
+	/* First sector mapped to DM_LINEAR */
+	r = dm_linear_target_set(&dmd.segment, 0, 1, crypt_data_device(cd), 0);
+	if (r)
+		goto out;
+
+	/* The rest is mapped to DM_ZERO (for now) */
+	r = dm_zero_target_set(dmd.segment.next, 1, dmd.size - 1);
+	if (r)
+		goto out;
+
+	log_dbg(cd, "Trying to activate BITLK on device %s%s%s.",
+		device_path(crypt_data_device(cd)), name ? "with name " :"", name ?: "");
+
+	r = dm_create_device(cd, name, CRYPT_BITLK, &dmd);
+out:
+	dm_targets_free(cd, &dmd);
+	return r;
+}

lib/bitlk/bitlk.h

@@ -0,0 +1,43 @@
+/*
+ * BITLK (BitLocker-compatible) header definition
+ *
+ * Copyright (C) 2019 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2019 Milan Broz
+ *
+ * This file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This file 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _CRYPTSETUP_BITLK_H
+#define _CRYPTSETUP_BITLK_H
+
+#include <stdint.h>
+#include <stddef.h>
+
+struct crypt_device;
+struct device;
+struct crypt_params_bitlk;
+
+int BITLK_read_sb(struct crypt_device *cd, struct crypt_params_bitlk *params);
+
+int BITLK_dump(struct crypt_device *cd, struct device *device);
+
+int BITLK_activate(struct crypt_device *cd,
+		   const char *name,
+		   const char *password,
+		   size_t passwordLen,
+		   const struct crypt_params_bitlk *params,
+		   uint32_t flags);
+
+#endif