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/*
* 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
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