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123 lines
2.5 KiB
C
123 lines
2.5 KiB
C
/*
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* dm.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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* Internal header file for device mapper
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*
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* Changelog
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*
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* 16/08/2001 - First version [Joe Thornber]
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*/
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#ifndef DM_INTERNAL_H
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#define DM_INTERNAL_H
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#define MAX_DEPTH 16
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#define NODE_SIZE L1_CACHE_BYTES
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#define KEYS_PER_NODE (NODE_SIZE / sizeof(offset_t))
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#define DM_NAME_LEN 64
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enum {
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DM_LOADED = 0,
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DM_LOADING,
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DM_ACTIVE,
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};
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struct dev_list {
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kdev_t dev;
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struct block_device *bd;
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struct dev_list *next;
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};
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struct mapped_device {
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kdev_t dev;
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char name[DM_NAME_LEN];
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int use_count;
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int state;
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atomic_t pending;
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/* btree table */
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int depth;
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int counts[MAX_DEPTH]; /* in nodes */
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offset_t *index[MAX_DEPTH];
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int num_targets;
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int num_allocated;
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offset_t *highs;
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dm_map_fn *targets;
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void **contexts;
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/* used by dm-fs.c */
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devfs_handle_t devfs_entry;
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/* a list of devices used by this md */
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struct dev_list *devices;
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};
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struct target {
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char *name;
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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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struct target *next;
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};
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/* dm-target.c */
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struct target *dm_get_target(const char *name);
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int dm_std_targets(void);
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/* dm.c */
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struct mapped_device *dm_find_name(const char *name);
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struct mapped_device *dm_find_minor(int minor);
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int dm_activate(struct mapped_device *md);
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void dm_suspend(struct mapped_device *md);
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/* dm-table.c */
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int dm_start_table(struct mapped_device *md);
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int dm_add_entry(struct mapped_device *md, offset_t high,
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dm_map_fn target, void *context);
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int dm_complete_table(struct mapped_device *md);
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int dm_clear_table(struct mapped_device *md);
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/* dm-fs.c */
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int dm_init_fs(void);
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int dm_fin_fs(void);
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static int is_active(struct mapped_device *md)
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{
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return test_bit(DM_ACTIVE, &md->state);
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}
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static void set_active(struct mapped_device *md, int set)
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{
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if (set)
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set_bit(DM_ACTIVE, &md->state);
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else
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clear_bit(DM_ACTIVE,& md->state);
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}
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#endif
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