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