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68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/*
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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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#ifdef __KERNEL__
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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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typedef unsigned int offset_t;
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/* constructor, destructor and map fn types */
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typedef int (*dm_ctr_fn)(struct dm_table *t,
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offset_t b, offset_t l,
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const char *cb, const char *ce, void **result);
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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, void *context);
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int dm_register_target(const char *name, dm_ctr_fn ctr, dm_dtr_fn dtr,
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dm_map_fn map);
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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_lookup_device(const char *path, kdev_t *d);
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int dm_table_add_device(struct dm_table *t, kdev_t dev);
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void dm_table_remove_device(struct dm_table *t, kdev_t dev);
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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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