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lvm2/lib/label/label.h

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/*
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* Copyright (C) 2002 Sistina Software (UK) Limited.
*
* This file is released under the LGPL.
*/
#ifndef _LVM_LABEL_H
#define _LVM_LABEL_H
#include "uuid.h"
#include "device.h"
struct label {
struct id id;
char volume_type[32];
uint32_t version[3];
void *extra_info;
struct labeller *labeller;
};
struct labeller;
struct label_ops {
/*
* Is the device labelled with this format ?
*/
int (*can_handle)(struct labeller *l, struct device *dev);
/*
* Write a label to a volume.
*/
int (*write)(struct labeller *l,
struct device *dev, struct label *label);
/*
* Remove a label from a device.
*/
int (*remove)(struct labeller *l, struct device *dev);
/*
* Read a label from a volume.
*/
int (*read)(struct labeller *l,
struct device *dev, struct label **label);
/*
* Additional consistency checks for the paranoid.
*/
int (*verify)(struct labeller *l, struct device *dev);
/*
* Destroy a previously read label.
*/
int (*destroy_label)(struct labeller *l, struct label *label);
/*
* Destructor.
*/
void (*destroy)(struct labeller *l);
};
struct labeller {
struct label_ops *ops;
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);
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int label_remove(struct device *dev);
int label_read(struct device *dev, struct label **result);
int label_verify(struct device *dev);
void label_destroy(struct label *lab);
/*
* We'll support two label types: the 'pretend the
* LVM1 pv structure at the begining of the disk
* is a label' hack, and pjc's 1 sector labels at
* the front and back of the device.
*/
#endif