mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-28 12:25:31 +00:00
784aae735d
Implement simple read-only sysfs entry for device-mapper block device. This patch adds a simple sysfs directory named "dm" under block device properties and implements - name attribute (string containing mapped device name) - uuid attribute (string containing UUID, or empty string if not set) The kobject is embedded in mapped_device struct, so no additional memory allocation is needed for initializing sysfs entry. During the processing of sysfs attribute we need to lock mapped device which is done by a new function dm_get_from_kobj, which returns the md associated with kobject and increases the usage count. Each 'show attribute' function is responsible for its own locking. Signed-off-by: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
102 lines
2.9 KiB
C
102 lines
2.9 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)
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*-----------------------------------------------------------------
|
|
* 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);
|
|
void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q);
|
|
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);
|
|
|
|
/*
|
|
* To check the return value from dm_table_find_target().
|
|
*/
|
|
#define dm_target_is_valid(t) ((t)->table)
|
|
int dm_table_barrier_ok(struct dm_table *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 *t);
|
|
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);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
int dm_open_count(struct mapped_device *md);
|
|
int dm_lock_for_deletion(struct mapped_device *md);
|
|
|
|
void dm_kobject_uevent(struct mapped_device *md);
|
|
|
|
int dm_kcopyd_init(void);
|
|
void dm_kcopyd_exit(void);
|
|
|
|
#endif
|