linux-imx

/*

 * Internal header file _only_ for device mapper core

 *

 * Copyright (C) 2016 Red Hat, Inc. All rights reserved.

 *

 * This file is released under the LGPL.

 */

​

#ifndef DM_CORE_INTERNAL_H

#define DM_CORE_INTERNAL_H

​

#include <linux/kthread.h>

#include <linux/ktime.h>

#include <linux/blk-mq.h>

​

#include <trace/events/block.h>

​

#include "dm.h"

​

#define DM_RESERVED_MAX_IOS     1024

​

struct dm_kobject_holder {

    struct kobject kobj;

    struct completion completion;

};

​

/*

 * DM core internal structure that used directly by dm.c and dm-rq.c

 * DM targets must _not_ deference a mapped_device to directly access its members!

 */

struct mapped_device {

    struct mutex suspend_lock;

​

    struct mutex table_devices_lock;

    struct list_head table_devices;

​

    /*

     * The current mapping (struct dm_table *).

     * Use dm_get_live_table{_fast} or take suspend_lock for

     * dereference.

     */

    void __rcu *map;

​

    unsigned long flags;

​

    /* Protect queue and type against concurrent access. */

    struct mutex type_lock;

    enum dm_queue_mode type;

​

    int numa_node_id;

    struct request_queue *queue;

​

    atomic_t holders;

    atomic_t open_count;

​

    struct dm_target *immutable_target;

    struct target_type *immutable_target_type;

​

    char name[16];

    struct gendisk *disk;

    struct dax_device *dax_dev;

​

    /*