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 {
29 struct list_head list;
30
31 atomic_t count;
32 int mode;
33 struct block_device *bdev;
34 char name[16];
35};
36
37struct dm_table;
38
39/*-----------------------------------------------------------------
40 * Internal table functions.
41 *---------------------------------------------------------------*/
42void dm_table_event_callback(struct dm_table *t,
43 void (*fn)(void *), void *context);
44struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
45struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
46void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
47struct list_head *dm_table_get_devices(struct dm_table *t);
48void dm_table_presuspend_targets(struct dm_table *t);
49void dm_table_postsuspend_targets(struct dm_table *t);
50int dm_table_resume_targets(struct dm_table *t);
51int dm_table_any_congested(struct dm_table *t, int bdi_bits);
52void dm_table_unplug_all(struct dm_table *t);
53
54/*
55 * To check the return value from dm_table_find_target().
56 */
57#define dm_target_is_valid(t) ((t)->table)
58
59/*-----------------------------------------------------------------
60 * A registry of target types.
61 *---------------------------------------------------------------*/
62int dm_target_init(void);
63void dm_target_exit(void);
64struct target_type *dm_get_target_type(const char *name);
65void dm_put_target_type(struct target_type *t);
66int dm_target_iterate(void (*iter_func)(struct target_type *tt,
67 void *param), void *param);
68
69/*-----------------------------------------------------------------
70 * Useful inlines.
71 *---------------------------------------------------------------*/
72static inline int array_too_big(unsigned long fixed, unsigned long obj,
73 unsigned long num)
74{
75 return (num > (ULONG_MAX - fixed) / obj);
76}
77
78int dm_split_args(int *argc, char ***argvp, char *input);
79
80/*
81 * The device-mapper can be driven through one of two interfaces;
82 * ioctl or filesystem, depending which patch you have applied.
83 */
84int dm_interface_init(void);
85void dm_interface_exit(void);
86
87/*
88 * Targets for linear and striped mappings
89 */
90int dm_linear_init(void);
91void dm_linear_exit(void);
92
93int dm_stripe_init(void);
94void dm_stripe_exit(void);
95
96void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
97union map_info *dm_get_mapinfo(struct bio *bio);
98int dm_open_count(struct mapped_device *md);
99int dm_lock_for_deletion(struct mapped_device *md);
100
101void dm_kobject_uevent(struct mapped_device *md);
102
103int dm_kcopyd_init(void);
104void dm_kcopyd_exit(void);
105
106#endif