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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
Mikulas Patockafd2ed4d2013-08-16 10:54:23 -040019#include "dm-stats.h"
20
Kiyoshi Ueda45cbcd72006-12-08 02:41:05 -080021/*
Kiyoshi Uedaa3d77d32006-12-08 02:41:04 -080022 * Suspend feature flags
23 */
24#define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
Kiyoshi Ueda81fdb092006-12-08 02:41:07 -080025#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
Kiyoshi Uedaa3d77d32006-12-08 02:41:04 -080026
27/*
Alasdair G Kergon1f4e0ff2012-07-27 15:08:16 +010028 * Status feature flags
29 */
30#define DM_STATUS_NOFLUSH_FLAG (1 << 0)
31
32/*
Kiyoshi Uedae6ee8c02009-06-22 10:12:36 +010033 * Type of table and mapped_device's mempool
34 */
35#define DM_TYPE_NONE 0
36#define DM_TYPE_BIO_BASED 1
37#define DM_TYPE_REQUEST_BASED 2
38
39/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 * List of devices that a metadevice uses and should open/close.
41 */
Mikulas Patocka82b15192008-10-10 13:37:09 +010042struct dm_dev_internal {
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 struct list_head list;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 atomic_t count;
Mikulas Patocka82b15192008-10-10 13:37:09 +010045 struct dm_dev dm_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046};
47
48struct dm_table;
Kiyoshi Uedae6ee8c02009-06-22 10:12:36 +010049struct dm_md_mempools;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51/*-----------------------------------------------------------------
Alasdair G Kergon17b2f662006-06-26 00:27:33 -070052 * Internal table functions.
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 *---------------------------------------------------------------*/
Mikulas Patockad5816872009-01-06 03:05:10 +000054void dm_table_destroy(struct dm_table *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055void dm_table_event_callback(struct dm_table *t,
56 void (*fn)(void *), void *context);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
58struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
Mike Snitzer3ae70652012-09-26 23:45:45 +010059bool dm_table_has_no_data_devices(struct dm_table *table);
Mike Snitzer754c5fc2009-06-22 10:12:34 +010060int dm_calculate_queue_limits(struct dm_table *table,
61 struct queue_limits *limits);
62void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
63 struct queue_limits *limits);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064struct list_head *dm_table_get_devices(struct dm_table *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065void dm_table_presuspend_targets(struct dm_table *t);
66void dm_table_postsuspend_targets(struct dm_table *t);
Milan Broz8757b772006-10-03 01:15:36 -070067int dm_table_resume_targets(struct dm_table *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068int dm_table_any_congested(struct dm_table *t, int bdi_bits);
Kiyoshi Uedacec47e32009-06-22 10:12:35 +010069int dm_table_any_busy_target(struct dm_table *t);
Kiyoshi Uedae6ee8c02009-06-22 10:12:36 +010070unsigned dm_table_get_type(struct dm_table *t);
Alasdair G Kergon36a04562011-10-31 20:19:04 +000071struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
Kiyoshi Uedae6ee8c02009-06-22 10:12:36 +010072bool dm_table_request_based(struct dm_table *t);
Mike Snitzer5ae89a82010-08-12 04:14:08 +010073bool dm_table_supports_discards(struct dm_table *t);
Kiyoshi Uedae6ee8c02009-06-22 10:12:36 +010074int dm_table_alloc_md_mempools(struct dm_table *t);
75void dm_table_free_md_mempools(struct dm_table *t);
76struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Mikulas Patockad5b9dd02011-08-02 12:32:04 +010078int dm_queue_merge_is_compulsory(struct request_queue *q);
79
Mike Snitzera5664da2010-08-12 04:14:01 +010080void dm_lock_md_type(struct mapped_device *md);
81void dm_unlock_md_type(struct mapped_device *md);
82void dm_set_md_type(struct mapped_device *md, unsigned type);
83unsigned dm_get_md_type(struct mapped_device *md);
Alasdair G Kergon36a04562011-10-31 20:19:04 +000084struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
Mike Snitzera5664da2010-08-12 04:14:01 +010085
Mike Snitzer4a0b4dd2010-08-12 04:14:02 +010086int dm_setup_md_queue(struct mapped_device *md);
87
Jun'ichi Nomura512875b2007-12-13 14:15:25 +000088/*
89 * To check the return value from dm_table_find_target().
90 */
91#define dm_target_is_valid(t) ((t)->table)
92
Kiyoshi Uedae6ee8c02009-06-22 10:12:36 +010093/*
Mike Snitzer169e2cc2013-08-22 18:21:38 -040094 * To check whether the target type is bio-based or not (request-based).
95 */
96#define dm_target_bio_based(t) ((t)->type->map != NULL)
97
98/*
Kiyoshi Uedae6ee8c02009-06-22 10:12:36 +010099 * To check whether the target type is request-based or not (bio-based).
100 */
101#define dm_target_request_based(t) ((t)->type->map_rq != NULL)
102
Mike Snitzer169e2cc2013-08-22 18:21:38 -0400103/*
104 * To check whether the target type is a hybrid (capable of being
105 * either request-based or bio-based).
106 */
107#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109/*-----------------------------------------------------------------
110 * A registry of target types.
111 *---------------------------------------------------------------*/
112int dm_target_init(void);
113void dm_target_exit(void);
114struct target_type *dm_get_target_type(const char *name);
Cheng Renquan45194e42009-04-02 19:55:28 +0100115void dm_put_target_type(struct target_type *tt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116int dm_target_iterate(void (*iter_func)(struct target_type *tt,
117 void *param), void *param);
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119int dm_split_args(int *argc, char ***argvp, char *input);
120
121/*
Mike Anderson432a2122009-12-10 23:52:20 +0000122 * Is this mapped_device being deleted?
123 */
124int dm_deleting_md(struct mapped_device *md);
125
126/*
Kiyoshi Ueda4f186f82009-12-10 23:52:26 +0000127 * Is this mapped_device suspended?
128 */
129int dm_suspended_md(struct mapped_device *md);
130
131/*
Mikulas Patocka2c140a22013-11-01 18:27:41 -0400132 * Test if the device is scheduled for deferred remove.
133 */
134int dm_test_deferred_remove_flag(struct mapped_device *md);
135
136/*
137 * Try to remove devices marked for deferred removal.
138 */
139void dm_deferred_remove(void);
140
141/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 * The device-mapper can be driven through one of two interfaces;
143 * ioctl or filesystem, depending which patch you have applied.
144 */
145int dm_interface_init(void);
146void dm_interface_exit(void);
147
148/*
Milan Broz784aae72009-01-06 03:05:12 +0000149 * sysfs interface
150 */
151int dm_sysfs_init(struct mapped_device *md);
152void dm_sysfs_exit(struct mapped_device *md);
153struct kobject *dm_kobject(struct mapped_device *md);
154struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
155
156/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 * Targets for linear and striped mappings
158 */
159int dm_linear_init(void);
160void dm_linear_exit(void);
161
162int dm_stripe_init(void);
163void dm_stripe_exit(void);
164
Kiyoshi Ueda3f77316d2010-08-12 04:13:56 +0100165/*
166 * mapped_device operations
167 */
168void dm_destroy(struct mapped_device *md);
169void dm_destroy_immediate(struct mapped_device *md);
Alasdair G Kergon5c6bd752006-06-26 00:27:34 -0700170int dm_open_count(struct mapped_device *md);
Mikulas Patocka2c140a22013-11-01 18:27:41 -0400171int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
172int dm_cancel_deferred_remove(struct mapped_device *md);
Mikulas Patockafd2ed4d2013-08-16 10:54:23 -0400173int dm_request_based(struct mapped_device *md);
174sector_t dm_get_size(struct mapped_device *md);
175struct dm_stats *dm_get_stats(struct mapped_device *md);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Peter Rajnoha3abf85b2010-03-06 02:32:31 +0000177int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
178 unsigned cookie);
Alasdair G Kergon69267a32007-12-13 14:15:57 +0000179
Mikulas Patockafd2ed4d2013-08-16 10:54:23 -0400180void dm_internal_suspend(struct mapped_device *md);
181void dm_internal_resume(struct mapped_device *md);
182
Mikulas Patocka952b3552009-12-10 23:51:57 +0000183int dm_io_init(void);
184void dm_io_exit(void);
185
Mikulas Patocka945fa4d2008-04-24 21:43:49 +0100186int dm_kcopyd_init(void);
187void dm_kcopyd_exit(void);
188
Kiyoshi Uedae6ee8c02009-06-22 10:12:36 +0100189/*
190 * Mempool operations
191 */
Mikulas Patockac0820cf2012-12-21 20:23:38 +0000192struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity, unsigned per_bio_data_size);
Kiyoshi Uedae6ee8c02009-06-22 10:12:36 +0100193void dm_free_md_mempools(struct dm_md_mempools *pools);
194
Mikulas Patockafd2ed4d2013-08-16 10:54:23 -0400195/*
196 * Helpers that are used by DM core
197 */
Mike Snitzere8603132013-09-12 18:06:12 -0400198unsigned dm_get_reserved_bio_based_ios(void);
Mike Snitzerf4790822013-09-12 18:06:12 -0400199unsigned dm_get_reserved_rq_based_ios(void);
200
Mikulas Patockafd2ed4d2013-08-16 10:54:23 -0400201static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen)
202{
203 return !maxlen || strlen(result) + 1 >= maxlen;
204}
205
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206#endif