Set UUID in device-mapper for LUKS devices.

Device mapper device should use UUID string if possible.
UDEV can then easily distinguish the device type etc.

cryptsetup now uses CRYPT prefix for uuid.



git-svn-id: https://cryptsetup.googlecode.com/svn/trunk@55 36d66b0a-2a48-0410-832c-cd162a569da5

lib/internal.h

@@ -37,7 +37,7 @@ struct setup_backend {
 	int		(*init)(void);
 	void		(*exit)(void);
 	int		(*create)(int reload, struct crypt_options *options,
-			          const char *key);
+			          const char *key, const char *uuid);
 	int		(*status)(int details, struct crypt_options *options,
 			          char **key);
 	int		(*remove)(int force, struct crypt_options *options);

lib/libdevmapper.c

@@ -18,7 +18,7 @@
 #include "internal.h"
 
 #define DEVICE_DIR	"/dev"
-
+#define UUID_PREFIX	"CRYPT-"
 #define	CRYPT_TARGET	"crypt"
 #define	RETRY_COUNT	5
 
@@ -247,19 +247,26 @@ static int _dm_remove(struct crypt_options *options, int force)
 }
 
 static int dm_create_device(int reload, struct crypt_options *options,
-                            const char *key)
+			    const char *key, const char *uuid)
 {
 	struct dm_task *dmt = NULL;
 	struct dm_task *dmt_query = NULL;
 	struct dm_info dmi;
 	char *params = NULL;
 	char *error = NULL;
+	char dev_uuid[64];
 	int r = -EINVAL;
 	uint32_t read_ahead = 0;
 
 	params = get_params(options, key);
 	if (!params)
 		goto out_no_removal;
+ 
+	if (uuid) {
+		strcpy(dev_uuid, UUID_PREFIX);
+		strcat(dev_uuid, uuid);
+	}
+
 	if (!(dmt = dm_task_create(reload ? DM_DEVICE_RELOAD
 	                                  : DM_DEVICE_CREATE)))
 		goto out;
@@ -275,6 +282,10 @@ static int dm_create_device(int reload, struct crypt_options *options,
 	    !dm_task_set_read_ahead(dmt, read_ahead, DM_READ_AHEAD_MINIMUM_FLAG))
 		goto out;
 #endif
+
+	if (uuid && !dm_task_set_uuid(dmt, dev_uuid))
+		goto out;
+
 	if (!dm_task_run(dmt))
 		goto out;
 
@@ -284,6 +295,8 @@ static int dm_create_device(int reload, struct crypt_options *options,
 			goto out;
 		if (!dm_task_set_name(dmt, options->name))
 			goto out;
+		if (uuid && !dm_task_set_uuid(dmt, dev_uuid))
+			goto out;
 		if (!dm_task_run(dmt))
 			goto out;
 	}

lib/setup.c

@@ -351,7 +351,7 @@ static int __crypt_create_device(int reload, struct setup_backend *backend,
 		return -ENOENT;
 	}
 
-	r = backend->create(reload, options, processed_key);
+	r = backend->create(reload, options, processed_key, NULL);
 
 	safe_free(processed_key);
 
@@ -404,7 +404,7 @@ static int __crypt_resize_device(int details, struct setup_backend *backend,
 	if (infos.readonly)
 		options->flags |= CRYPT_FLAG_READONLY;
 
-	r = backend->create(1, &tmp, key);
+	r = backend->create(1, &tmp, key, NULL);
 
 	safe_free(key);
 
@@ -579,7 +579,9 @@ start:
 		r = -EINVAL; goto out2;
 	}
 	options->size -= options->offset;
-	r = backend->create(0, options, mk->key);
+	/* FIXME: code allows multiple crypt mapping, cannot use uuid then.
+	 * anyway, it is dangerous and can corrupt data. Remove it in next version! */
+	r = backend->create(0, options, mk->key, excl ? hdr.uuid : NULL);
 
  out2:
 	free(dmCipherSpec);

luks/keyencryption.c

@@ -89,7 +89,7 @@ static int setup_mapping(const char *cipher, const char *name,
 
 	set_error(NULL);
 
-	r = backend->create(0, options, key);
+	r = backend->create(0, options, key, NULL);
 
 	return r;
 }