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* Internal header file for device mapper
* Copyright (C) 2001, 2002 Sistina Software
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
* This file is released under the LGPL.
#include <linux/fs.h>
#include <linux/device-mapper.h>
#include <linux/list.h>
#include <linux/moduleparam.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/hdreg.h>
#include <linux/completion.h>
#include <linux/kobject.h>
#include "dm-stats.h"
* Suspend feature flags
#define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
* Status feature flags
#define DM_STATUS_NOFLUSH_FLAG (1 << 0)
* List of devices that a metadevice uses and should open/close.
struct dm_dev_internal {
struct list_head list;
atomic_t count;
struct dm_dev *dm_dev;
struct dm_table;
struct dm_md_mempools;
* Internal table functions.
void dm_table_destroy(struct dm_table *t);
void dm_table_event_callback(struct dm_table *t,
void (*fn)(void *), void *context);
struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
bool dm_table_has_no_data_devices(struct dm_table *table);
int dm_calculate_queue_limits(struct dm_table *table,
struct queue_limits *limits);
void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
struct queue_limits *limits);
struct list_head *dm_table_get_devices(struct dm_table *t);
void dm_table_presuspend_targets(struct dm_table *t);
void dm_table_presuspend_undo_targets(struct dm_table *t);
void dm_table_postsuspend_targets(struct dm_table *t);
int dm_table_resume_targets(struct dm_table *t);
int dm_table_any_congested(struct dm_table *t, int bdi_bits);
enum dm_queue_mode dm_table_get_type(struct dm_table *t);
struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
bool dm_table_bio_based(struct dm_table *t);
bool dm_table_request_based(struct dm_table *t);
bool dm_table_all_blk_mq_devices(struct dm_table *t);
void dm_table_free_md_mempools(struct dm_table *t);
struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
void dm_lock_md_type(struct mapped_device *md);
void dm_unlock_md_type(struct mapped_device *md);
void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type);
enum dm_queue_mode dm_get_md_type(struct mapped_device *md);
struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
* To check the return value from dm_table_find_target().
#define dm_target_is_valid(t) ((t)->table)
* To check whether the target type is bio-based or not (request-based).
#define dm_target_bio_based(t) ((t)->type->map != NULL)
* To check whether the target type is request-based or not (bio-based).
#define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL)
* To check whether the target type is a hybrid (capable of being
* either request-based or bio-based).
#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
* A registry of target types.
int dm_target_init(void);
void dm_target_exit(void);
struct target_type *dm_get_target_type(const char *name);
void dm_put_target_type(struct target_type *tt);
int dm_target_iterate(void (*iter_func)(struct target_type *tt,
void *param), void *param);
int dm_split_args(int *argc, char ***argvp, char *input);
* Is this mapped_device being deleted?
int dm_deleting_md(struct mapped_device *md);
* Is this mapped_device suspended?
int dm_suspended_md(struct mapped_device *md);
* Internal suspend and resume methods.
int dm_suspended_internally_md(struct mapped_device *md);
void dm_internal_suspend_fast(struct mapped_device *md);
void dm_internal_resume_fast(struct mapped_device *md);
void dm_internal_suspend_noflush(struct mapped_device *md);
void dm_internal_resume(struct mapped_device *md);
* Test if the device is scheduled for deferred remove.
int dm_test_deferred_remove_flag(struct mapped_device *md);
* Try to remove devices marked for deferred removal.
void dm_deferred_remove(void);
* The device-mapper can be driven through one of two interfaces;
* ioctl or filesystem, depending which patch you have applied.
int dm_interface_init(void);
void dm_interface_exit(void);
* sysfs interface
int dm_sysfs_init(struct mapped_device *md);
void dm_sysfs_exit(struct mapped_device *md);
struct kobject *dm_kobject(struct mapped_device *md);
struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
* The kobject helper
void dm_kobject_release(struct kobject *kobj);
* Targets for linear and striped mappings
int dm_linear_init(void);
void dm_linear_exit(void);
int dm_stripe_init(void);
void dm_stripe_exit(void);
* mapped_device operations
void dm_destroy(struct mapped_device *md);
void dm_destroy_immediate(struct mapped_device *md);
int dm_open_count(struct mapped_device *md);
int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
int dm_cancel_deferred_remove(struct mapped_device *md);
int dm_request_based(struct mapped_device *md);
sector_t dm_get_size(struct mapped_device *md);
struct request_queue *dm_get_md_queue(struct mapped_device *md);
int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
struct dm_dev **result);
void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
struct dm_stats *dm_get_stats(struct mapped_device *md);
int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
unsigned cookie);
void dm_internal_suspend(struct mapped_device *md);
void dm_internal_resume(struct mapped_device *md);
int dm_io_init(void);
void dm_io_exit(void);
int dm_kcopyd_init(void);
void dm_kcopyd_exit(void);
* Mempool operations
struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type,
unsigned integrity, unsigned per_bio_data_size);
void dm_free_md_mempools(struct dm_md_mempools *pools);
* Various helpers
unsigned dm_get_reserved_bio_based_ios(void);