tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Internal header file for device mapper
3 *
4 * Copyright (C) 2001, 2002 Sistina Software
5 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
6 *
7 * This file is released under the LGPL.
8 */
9
10#ifndef DM_INTERNAL_H
11#define DM_INTERNAL_H
12
13#include <linux/fs.h>
14#include <linux/device-mapper.h>
15#include <linux/list.h>
16#include <linux/blkdev.h>
17#include <linux/hdreg.h>
18
19/*
20 * Suspend feature flags
21 */
22#define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
23#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
24
25/*
26 * List of devices that a metadevice uses and should open/close.
27 */
28struct dm_dev_internal {
29 struct list_head list;
30 atomic_t count;
31 struct dm_dev dm_dev;
32};
33
34struct dm_table;
35
36/*-----------------------------------------------------------------
37 * Internal table functions.
38 *---------------------------------------------------------------*/
39void dm_table_event_callback(struct dm_table *t,
40 void (*fn)(void *), void *context);
41struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
42struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
43void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
44struct list_head *dm_table_get_devices(struct dm_table *t);
45void dm_table_presuspend_targets(struct dm_table *t);
46void dm_table_postsuspend_targets(struct dm_table *t);
47int dm_table_resume_targets(struct dm_table *t);
48int dm_table_any_congested(struct dm_table *t, int bdi_bits);
49
50/*
51 * To check the return value from dm_table_find_target().
52 */
53#define dm_target_is_valid(t) ((t)->table)
54
55/*-----------------------------------------------------------------
56 * A registry of target types.
57 *---------------------------------------------------------------*/
58int dm_target_init(void);
59void dm_target_exit(void);
60struct target_type *dm_get_target_type(const char *name);
61void dm_put_target_type(struct target_type *t);
62int dm_target_iterate(void (*iter_func)(struct target_type *tt,
63 void *param), void *param);
64
65int dm_split_args(int *argc, char ***argvp, char *input);
66
67/*
68 * The device-mapper can be driven through one of two interfaces;
69 * ioctl or filesystem, depending which patch you have applied.
70 */
71int dm_interface_init(void);
72void dm_interface_exit(void);
73
74/*
75 * Targets for linear and striped mappings
76 */
77int dm_linear_init(void);
78void dm_linear_exit(void);
79
80int dm_stripe_init(void);
81void dm_stripe_exit(void);
82
83int dm_open_count(struct mapped_device *md);
84int dm_lock_for_deletion(struct mapped_device *md);
85
86void dm_kobject_uevent(struct mapped_device *md);
87
88int dm_kcopyd_init(void);
89void dm_kcopyd_exit(void);
90
91#endif