dm.h (7060B)
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/moduleparam.h> 17#include <linux/blkdev.h> 18#include <linux/backing-dev.h> 19#include <linux/hdreg.h> 20#include <linux/completion.h> 21#include <linux/kobject.h> 22#include <linux/refcount.h> 23 24#include "dm-stats.h" 25 26/* 27 * Suspend feature flags 28 */ 29#define DM_SUSPEND_LOCKFS_FLAG (1 << 0) 30#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1) 31 32/* 33 * Status feature flags 34 */ 35#define DM_STATUS_NOFLUSH_FLAG (1 << 0) 36 37/* 38 * List of devices that a metadevice uses and should open/close. 39 */ 40struct dm_dev_internal { 41 struct list_head list; 42 refcount_t count; 43 struct dm_dev *dm_dev; 44}; 45 46struct dm_table; 47struct dm_md_mempools; 48struct dm_target_io; 49struct dm_io; 50 51/*----------------------------------------------------------------- 52 * Internal table functions. 53 *---------------------------------------------------------------*/ 54void dm_table_event_callback(struct dm_table *t, 55 void (*fn)(void *), void *context); 56struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index); 57struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector); 58bool dm_table_has_no_data_devices(struct dm_table *table); 59int dm_calculate_queue_limits(struct dm_table *table, 60 struct queue_limits *limits); 61int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, 62 struct queue_limits *limits); 63struct list_head *dm_table_get_devices(struct dm_table *t); 64void dm_table_presuspend_targets(struct dm_table *t); 65void dm_table_presuspend_undo_targets(struct dm_table *t); 66void dm_table_postsuspend_targets(struct dm_table *t); 67int dm_table_resume_targets(struct dm_table *t); 68enum dm_queue_mode dm_table_get_type(struct dm_table *t); 69struct target_type *dm_table_get_immutable_target_type(struct dm_table *t); 70struct dm_target *dm_table_get_immutable_target(struct dm_table *t); 71struct dm_target *dm_table_get_wildcard_target(struct dm_table *t); 72bool dm_table_bio_based(struct dm_table *t); 73bool dm_table_request_based(struct dm_table *t); 74 75void dm_lock_md_type(struct mapped_device *md); 76void dm_unlock_md_type(struct mapped_device *md); 77void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type); 78enum dm_queue_mode dm_get_md_type(struct mapped_device *md); 79struct target_type *dm_get_immutable_target_type(struct mapped_device *md); 80 81int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t); 82 83/* 84 * To check whether the target type is bio-based or not (request-based). 85 */ 86#define dm_target_bio_based(t) ((t)->type->map != NULL) 87 88/* 89 * To check whether the target type is request-based or not (bio-based). 90 */ 91#define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL) 92 93/* 94 * To check whether the target type is a hybrid (capable of being 95 * either request-based or bio-based). 96 */ 97#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t)) 98 99/* 100 * Zoned targets related functions. 101 */ 102int dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q); 103void dm_zone_endio(struct dm_io *io, struct bio *clone); 104#ifdef CONFIG_BLK_DEV_ZONED 105void dm_cleanup_zoned_dev(struct mapped_device *md); 106int dm_blk_report_zones(struct gendisk *disk, sector_t sector, 107 unsigned int nr_zones, report_zones_cb cb, void *data); 108bool dm_is_zone_write(struct mapped_device *md, struct bio *bio); 109int dm_zone_map_bio(struct dm_target_io *io); 110#else 111static inline void dm_cleanup_zoned_dev(struct mapped_device *md) {} 112#define dm_blk_report_zones NULL 113static inline bool dm_is_zone_write(struct mapped_device *md, struct bio *bio) 114{ 115 return false; 116} 117static inline int dm_zone_map_bio(struct dm_target_io *tio) 118{ 119 return DM_MAPIO_KILL; 120} 121#endif 122 123/*----------------------------------------------------------------- 124 * A registry of target types. 125 *---------------------------------------------------------------*/ 126int dm_target_init(void); 127void dm_target_exit(void); 128struct target_type *dm_get_target_type(const char *name); 129void dm_put_target_type(struct target_type *tt); 130int dm_target_iterate(void (*iter_func)(struct target_type *tt, 131 void *param), void *param); 132 133int dm_split_args(int *argc, char ***argvp, char *input); 134 135/* 136 * Is this mapped_device being deleted? 137 */ 138int dm_deleting_md(struct mapped_device *md); 139 140/* 141 * Is this mapped_device suspended? 142 */ 143int dm_suspended_md(struct mapped_device *md); 144 145/* 146 * Internal suspend and resume methods. 147 */ 148int dm_suspended_internally_md(struct mapped_device *md); 149void dm_internal_suspend_fast(struct mapped_device *md); 150void dm_internal_resume_fast(struct mapped_device *md); 151void dm_internal_suspend_noflush(struct mapped_device *md); 152void dm_internal_resume(struct mapped_device *md); 153 154/* 155 * Test if the device is scheduled for deferred remove. 156 */ 157int dm_test_deferred_remove_flag(struct mapped_device *md); 158 159/* 160 * Try to remove devices marked for deferred removal. 161 */ 162void dm_deferred_remove(void); 163 164/* 165 * The device-mapper can be driven through one of two interfaces; 166 * ioctl or filesystem, depending which patch you have applied. 167 */ 168int dm_interface_init(void); 169void dm_interface_exit(void); 170 171/* 172 * sysfs interface 173 */ 174int dm_sysfs_init(struct mapped_device *md); 175void dm_sysfs_exit(struct mapped_device *md); 176struct kobject *dm_kobject(struct mapped_device *md); 177struct mapped_device *dm_get_from_kobject(struct kobject *kobj); 178 179/* 180 * The kobject helper 181 */ 182void dm_kobject_release(struct kobject *kobj); 183 184/* 185 * Targets for linear and striped mappings 186 */ 187int dm_linear_init(void); 188void dm_linear_exit(void); 189 190int dm_stripe_init(void); 191void dm_stripe_exit(void); 192 193/* 194 * mapped_device operations 195 */ 196void dm_destroy(struct mapped_device *md); 197void dm_destroy_immediate(struct mapped_device *md); 198int dm_open_count(struct mapped_device *md); 199int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred); 200int dm_cancel_deferred_remove(struct mapped_device *md); 201int dm_request_based(struct mapped_device *md); 202int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode, 203 struct dm_dev **result); 204void dm_put_table_device(struct mapped_device *md, struct dm_dev *d); 205 206int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action, 207 unsigned cookie); 208 209void dm_internal_suspend(struct mapped_device *md); 210void dm_internal_resume(struct mapped_device *md); 211 212int dm_io_init(void); 213void dm_io_exit(void); 214 215int dm_kcopyd_init(void); 216void dm_kcopyd_exit(void); 217 218/* 219 * Mempool operations 220 */ 221struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type, 222 unsigned per_io_data_size, unsigned min_pool_size, 223 bool integrity, bool poll); 224void dm_free_md_mempools(struct dm_md_mempools *pools); 225 226/* 227 * Various helpers 228 */ 229unsigned dm_get_reserved_bio_based_ios(void); 230 231#endif