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73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
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/*
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* device-mapper.h
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*
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* Copyright (C) 2001 Sistina Software
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*
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* This software is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2, or (at
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* your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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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: steal LVM's devices for now */
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#define DM_BLK_MAJOR LVM_BLK_MAJOR
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#define DM_CTL_MAJOR LVM_CHAR_MAJOR
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typedef unsigned int offset_t;
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struct device_map {
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offset_t high;
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const char *type;
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const char *context;
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};
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struct device_table {
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unsigned int minor;
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unsigned int major;
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unsigned long count;
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struct device_map *map;
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};
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#define MAPPED_DEVICE_CREATE _IOWR(DM_CTL_MAJOR, 0, struct device_table)
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#define MAPPED_DEVICE_DESTROY _IOW(DM_CTL_MAJOR, 1, struct device_table)
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#ifdef __KERNEL__
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typedef int (*dm_ctr_fn)(offset_t b, offset_t e,
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const char *context, void **result);
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typedef void (*dm_dtr_fn)(void *c);
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typedef int (*dm_map_fn)(struct buffer_head *bh, void *context);
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int register_mapping_type(const char *name, dm_ctr_fn ctr, dm_dtr_fn dtr,
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dm_map_fn map);
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#endif
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#endif
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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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