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lvm2/driver/device-mapper/device-mapper.h
2001-09-26 19:48:20 +00:00

89 lines
2.0 KiB
C

/*
* device-mapper.h
*
* Copyright (C) 2001 Sistina Software (UK) Limited.
*
* This file is released under the GPL.
*/
/*
* Changelog
*
* 14/08/2001 - First version [Joe Thornber]
*/
#ifndef DEVICE_MAPPER_H
#define DEVICE_MAPPER_H
#include <linux/major.h>
/* FIXME: Use value from local range for now, for co-existence with LVM 1 */
#define DM_BLK_MAJOR 124
struct dm_table;
struct dm_dev;
struct text_region;
typedef unsigned int offset_t;
typedef void (*dm_error_fn)(const char *message, void *private);
/*
* constructor, destructor and map fn types
*/
typedef int (*dm_ctr_fn)(struct dm_table *t, offset_t b, offset_t l,
struct text_region *args, void **context,
dm_error_fn err, void *e_private);
typedef void (*dm_dtr_fn)(struct dm_table *t, void *c);
typedef int (*dm_map_fn)(struct buffer_head *bh, int rw, void *context);
typedef int (*dm_err_fn)(struct buffer_head *bh, int rw, void *context);
/*
* Contructors should call this to make sure any
* destination devices are handled correctly
* (ie. opened/closed).
*/
int dm_table_get_device(struct dm_table *t, const char *path,
struct dm_dev **result);
void dm_table_put_device(struct dm_table *table, struct dm_dev *d);
/*
* information about a target type
*/
struct target_type {
const char *name;
struct module *module;
dm_ctr_fn ctr;
dm_dtr_fn dtr;
dm_map_fn map;
dm_err_fn err;
};
int dm_register_target(struct target_type *t);
int dm_unregister_target(struct target_type *t);
/*
* These may be useful for people writing target
* types.
*/
struct text_region {
const char *b;
const char *e;
};
int dm_get_number(struct text_region *txt, unsigned int *n);
int dm_get_line(struct text_region *txt, struct text_region *line);
int dm_get_word(struct text_region *txt, struct text_region *word);
void dm_txt_copy(char *dest, size_t max, struct text_region *txt);
void dm_eat_space(struct text_region *txt);
#endif /* DEVICE_MAPPER_H */
/*
* Local variables:
* c-file-style: "linux"
* End:
*/