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 * Type of table and mapped_device's mempool 27 */ 28#define DM_TYPE_NONE 0 29#define DM_TYPE_BIO_BASED 1 30#define DM_TYPE_REQUEST_BASED 2 31 32/* 33 * List of devices that a metadevice uses and should open/close. 34 */ 35struct dm_dev_internal { 36 struct list_head list; 37 atomic_t count; 38 struct dm_dev dm_dev; 39}; 40 41struct dm_table; 42struct dm_md_mempools; 43 44/*----------------------------------------------------------------- 45 * Internal table functions. 46 *---------------------------------------------------------------*/ 47void dm_table_destroy(struct dm_table *t); 48void dm_table_event_callback(struct dm_table *t, 49 void (*fn)(void *), void *context); 50struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index); 51struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector); 52int dm_calculate_queue_limits(struct dm_table *table, 53 struct queue_limits *limits); 54void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, 55 struct queue_limits *limits); 56struct list_head *dm_table_get_devices(struct dm_table *t); 57void dm_table_presuspend_targets(struct dm_table *t); 58void dm_table_postsuspend_targets(struct dm_table *t); 59int dm_table_resume_targets(struct dm_table *t); 60int dm_table_any_congested(struct dm_table *t, int bdi_bits); 61int dm_table_any_busy_target(struct dm_table *t); 62unsigned dm_table_get_type(struct dm_table *t); 63bool dm_table_request_based(struct dm_table *t); 64bool dm_table_supports_discards(struct dm_table *t); 65int dm_table_alloc_md_mempools(struct dm_table *t); 66void dm_table_free_md_mempools(struct dm_table *t); 67struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t); 68 69void dm_lock_md_type(struct mapped_device *md); 70void dm_unlock_md_type(struct mapped_device *md); 71void dm_set_md_type(struct mapped_device *md, unsigned type); 72unsigned dm_get_md_type(struct mapped_device *md); 73 74int dm_setup_md_queue(struct mapped_device *md); 75 76/* 77 * To check the return value from dm_table_find_target(). 78 */ 79#define dm_target_is_valid(t) ((t)->table) 80 81/* 82 * To check whether the target type is request-based or not (bio-based). 83 */ 84#define dm_target_request_based(t) ((t)->type->map_rq != NULL) 85 86/*----------------------------------------------------------------- 87 * A registry of target types. 88 *---------------------------------------------------------------*/ 89int dm_target_init(void); 90void dm_target_exit(void); 91struct target_type *dm_get_target_type(const char *name); 92void dm_put_target_type(struct target_type *tt); 93int dm_target_iterate(void (*iter_func)(struct target_type *tt, 94 void *param), void *param); 95 96int dm_split_args(int *argc, char ***argvp, char *input); 97 98/* 99 * Is this mapped_device being deleted? 100 */ 101int dm_deleting_md(struct mapped_device *md); 102 103/* 104 * Is this mapped_device suspended? 105 */ 106int dm_suspended_md(struct mapped_device *md); 107 108/* 109 * The device-mapper can be driven through one of two interfaces; 110 * ioctl or filesystem, depending which patch you have applied. 111 */ 112int dm_interface_init(void); 113void dm_interface_exit(void); 114 115/* 116 * sysfs interface 117 */ 118int dm_sysfs_init(struct mapped_device *md); 119void dm_sysfs_exit(struct mapped_device *md); 120struct kobject *dm_kobject(struct mapped_device *md); 121struct mapped_device *dm_get_from_kobject(struct kobject *kobj); 122 123/* 124 * Targets for linear and striped mappings 125 */ 126int dm_linear_init(void); 127void dm_linear_exit(void); 128 129int dm_stripe_init(void); 130void dm_stripe_exit(void); 131 132/* 133 * mapped_device operations 134 */ 135void dm_destroy(struct mapped_device *md); 136void dm_destroy_immediate(struct mapped_device *md); 137int dm_open_count(struct mapped_device *md); 138int dm_lock_for_deletion(struct mapped_device *md); 139 140int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, 141 unsigned cookie); 142 143int dm_io_init(void); 144void dm_io_exit(void); 145 146int dm_kcopyd_init(void); 147void dm_kcopyd_exit(void); 148 149/* 150 * Mempool operations 151 */ 152struct dm_md_mempools *dm_alloc_md_mempools(unsigned type); 153void dm_free_md_mempools(struct dm_md_mempools *pools); 154 155#endif 156