36a0456fbf
Introduce DM_TARGET_IMMUTABLE to indicate that the target type cannot be mixed with any other target type, and once loaded into a device, it cannot be replaced with a table containing a different type. The thin provisioning pool device will use this. Signed-off-by: Alasdair G Kergon <agk@redhat.com>
160 lines
4.6 KiB
C
160 lines
4.6 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef DM_INTERNAL_H
|
|
#define DM_INTERNAL_H
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/device-mapper.h>
|
|
#include <linux/list.h>
|
|
#include <linux/blkdev.h>
|
|
#include <linux/hdreg.h>
|
|
|
|
/*
|
|
* Suspend feature flags
|
|
*/
|
|
#define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
|
|
#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
|
|
|
|
/*
|
|
* Type of table and mapped_device's mempool
|
|
*/
|
|
#define DM_TYPE_NONE 0
|
|
#define DM_TYPE_BIO_BASED 1
|
|
#define DM_TYPE_REQUEST_BASED 2
|
|
|
|
/*
|
|
* 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);
|
|
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_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);
|
|
int dm_table_any_busy_target(struct dm_table *t);
|
|
unsigned dm_table_get_type(struct dm_table *t);
|
|
struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
|
|
bool dm_table_request_based(struct dm_table *t);
|
|
bool dm_table_supports_discards(struct dm_table *t);
|
|
int dm_table_alloc_md_mempools(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);
|
|
|
|
int dm_queue_merge_is_compulsory(struct request_queue *q);
|
|
|
|
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, unsigned type);
|
|
unsigned 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);
|
|
|
|
/*
|
|
* 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 request-based or not (bio-based).
|
|
*/
|
|
#define dm_target_request_based(t) ((t)->type->map_rq != NULL)
|
|
|
|
/*-----------------------------------------------------------------
|
|
* 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);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
|
|
unsigned cookie);
|
|
|
|
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(unsigned type, unsigned integrity);
|
|
void dm_free_md_mempools(struct dm_md_mempools *pools);
|
|
|
|
#endif
|