blob: 20194e000c5afcda9e10965d17c945b0df5d7171 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Internal header file for device mapper
3 *
4 * Copyright (C) 2001, 2002 Sistina Software
Alasdair G Kergon2b06cff2006-06-26 00:27:32 -07005 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
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>
Darrick J. Wong3ac51e72006-03-27 01:17:54 -080017#include <linux/hdreg.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Kiyoshi Ueda45cbcd72006-12-08 02:41:05 -080019/*
Kiyoshi Uedaa3d77d32006-12-08 02:41:04 -080020 * Suspend feature flags
21 */
22#define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
Kiyoshi Ueda81fdb092006-12-08 02:41:07 -080023#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
Kiyoshi Uedaa3d77d32006-12-08 02:41:04 -080024
25/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 * List of devices that a metadevice uses and should open/close.
27 */
Mikulas Patocka82b15192008-10-10 13:37:09 +010028struct dm_dev_internal {
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 atomic_t count;
Mikulas Patocka82b15192008-10-10 13:37:09 +010031 struct dm_dev dm_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070032};
33
34struct dm_table;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36/*-----------------------------------------------------------------
Alasdair G Kergon17b2f662006-06-26 00:27:33 -070037 * Internal table functions.
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 *---------------------------------------------------------------*/
Mikulas Patockad5816872009-01-06 03:05:10 +000039void dm_table_destroy(struct dm_table *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040void dm_table_event_callback(struct dm_table *t,
41 void (*fn)(void *), void *context);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
43struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
44void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045struct list_head *dm_table_get_devices(struct dm_table *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046void dm_table_presuspend_targets(struct dm_table *t);
47void dm_table_postsuspend_targets(struct dm_table *t);
Milan Broz8757b772006-10-03 01:15:36 -070048int dm_table_resume_targets(struct dm_table *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049int dm_table_any_congested(struct dm_table *t, int bdi_bits);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
Jun'ichi Nomura512875b2007-12-13 14:15:25 +000051/*
52 * To check the return value from dm_table_find_target().
53 */
54#define dm_target_is_valid(t) ((t)->table)
Andi Kleenab4c142482009-01-06 03:05:09 +000055int dm_table_barrier_ok(struct dm_table *t);
Jun'ichi Nomura512875b2007-12-13 14:15:25 +000056
Linus Torvalds1da177e2005-04-16 15:20:36 -070057/*-----------------------------------------------------------------
58 * A registry of target types.
59 *---------------------------------------------------------------*/
60int dm_target_init(void);
61void dm_target_exit(void);
62struct target_type *dm_get_target_type(const char *name);
63void dm_put_target_type(struct target_type *t);
64int dm_target_iterate(void (*iter_func)(struct target_type *tt,
65 void *param), void *param);
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067int dm_split_args(int *argc, char ***argvp, char *input);
68
69/*
70 * The device-mapper can be driven through one of two interfaces;
71 * ioctl or filesystem, depending which patch you have applied.
72 */
73int dm_interface_init(void);
74void dm_interface_exit(void);
75
76/*
Milan Broz784aae72009-01-06 03:05:12 +000077 * sysfs interface
78 */
79int dm_sysfs_init(struct mapped_device *md);
80void dm_sysfs_exit(struct mapped_device *md);
81struct kobject *dm_kobject(struct mapped_device *md);
82struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
83
84/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 * Targets for linear and striped mappings
86 */
87int dm_linear_init(void);
88void dm_linear_exit(void);
89
90int dm_stripe_init(void);
91void dm_stripe_exit(void);
92
Alasdair G Kergon5c6bd752006-06-26 00:27:34 -070093int dm_open_count(struct mapped_device *md);
94int dm_lock_for_deletion(struct mapped_device *md);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Alasdair G Kergon69267a32007-12-13 14:15:57 +000096void dm_kobject_uevent(struct mapped_device *md);
97
Mikulas Patocka945fa4d2008-04-24 21:43:49 +010098int dm_kcopyd_init(void);
99void dm_kcopyd_exit(void);
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101#endif