Imported Upstream version 2.02.79upstream/2.02.79

1 files changed, 106 insertions, 0 deletions

diff --git a/lib/label/label.h b/lib/label/label.h
new file mode 100644
index 0000000..3e07f06
--- /dev/null
+++ b/lib/label/label.h
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2002-2004 Sistina Software, Inc. All rights reserved.  
+ * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
+ *
+ * This file is part of LVM2.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU Lesser General Public License v.2.1.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef _LVM_LABEL_H
+#define _LVM_LABEL_H
+
+#include "uuid.h"
+#include "device.h"
+
+#define LABEL_ID "LABELONE"
+#define LABEL_SIZE SECTOR_SIZE	/* Think very carefully before changing this */
+#define LABEL_SCAN_SECTORS 4L
+#define LABEL_SCAN_SIZE (LABEL_SCAN_SECTORS << SECTOR_SHIFT)
+
+struct labeller;
+
+/* On disk - 32 bytes */
+struct label_header {
+	int8_t id[8];		/* LABELONE */
+	uint64_t sector_xl;	/* Sector number of this label */
+	uint32_t crc_xl;	/* From next field to end of sector */
+	uint32_t offset_xl;	/* Offset from start of struct to contents */
+	int8_t type[8];		/* LVM2 001 */
+} __attribute__ ((packed));
+
+/* In core */
+struct label {
+	char type[8];
+	uint64_t sector;
+	struct labeller *labeller;
+	void *info;
+};
+
+struct labeller;
+
+struct label_ops {
+	/*
+	 * Is the device labelled with this format ?
+	 */
+	int (*can_handle) (struct labeller * l, void *buf, uint64_t sector);
+
+	/*
+	 * Write a label to a volume.
+	 */
+	int (*write) (struct label * label, void *buf);
+
+	/*
+	 * Read a label from a volume.
+	 */
+	int (*read) (struct labeller * l, struct device * dev,
+		     void *buf, struct label ** label);
+
+	/*
+	 * Additional consistency checks for the paranoid.
+	 */
+	int (*verify) (struct labeller * l, void *buf, uint64_t sector);
+
+	/*
+	 * Populate label_type etc.
+	 */
+	int (*initialise_label) (struct labeller * l, struct label * label);
+
+	/*
+	 * Destroy a previously read label.
+	 */
+	void (*destroy_label) (struct labeller * l, struct label * label);
+
+	/*
+	 * Destructor.
+	 */
+	void (*destroy) (struct labeller * l);
+};
+
+struct labeller {
+	struct label_ops *ops;
+	const void *private;
+};
+
+int label_init(void);
+void label_exit(void);
+
+int label_register_handler(const char *name, struct labeller *handler);
+
+struct labeller *label_get_handler(const char *name);
+
+int label_remove(struct device *dev);
+int label_read(struct device *dev, struct label **result,
+		uint64_t scan_sector);
+int label_write(struct device *dev, struct label *label);
+int label_verify(struct device *dev);
+struct label *label_create(struct labeller *labeller);
+void label_destroy(struct label *label);
+
+#endif