mirror of
git://sourceware.org/git/lvm2.git
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de37c802d7
o Added error handler (not sure that this is the "correct" way to do this at the moment, so its a bit exprimental for now)
97 lines
2.6 KiB
C
97 lines
2.6 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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#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 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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/* 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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struct text_region *args, void **result,
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dm_error_fn fn, void *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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* information about a target type
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*/
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struct target_type {
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struct list_head list;
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const char *name;
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long use;
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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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unsigned long flags;
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};
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#define TF_BMAP 0x0001 /* Target supports bmap operation */
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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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struct block_device *dm_blkdev_get(const char *path);
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int dm_blkdev_put(struct block_device *);
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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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/*
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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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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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