linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>

 *          Horst Hummel <Horst.Hummel@de.ibm.com>

 *          Carsten Otte <Cotte@de.ibm.com>

 *          Martin Schwidefsky <schwidefsky@de.ibm.com>

 * Bugreports.to..: <Linux390@de.ibm.com>

 * Copyright IBM Corp. 1999, 2001

 *

 * i/o controls for the dasd driver.

 */

​

#define KMSG_COMPONENT "dasd"

​

#include <linux/interrupt.h>

#include <linux/compat.h>

#include <linux/major.h>

#include <linux/fs.h>

#include <linux/blkpg.h>

#include <linux/slab.h>

#include <asm/ccwdev.h>

#include <asm/schid.h>

#include <asm/cmb.h>

#include <linux/uaccess.h>

​

/* This is ugly... */

#define PRINTK_HEADER "dasd_ioctl:"

​

#include "dasd_int.h"

​

​

static int

dasd_ioctl_api_version(void __user *argp)

{

    int ver = DASD_API_VERSION;

    return put_user(ver, (int __user *)argp);

}

​

/*

 * Enable device.

 * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection

 */

static int

dasd_ioctl_enable(struct block_device *bdev)

{

    struct dasd_device *base;

​

    if (!capable(CAP_SYS_ADMIN))

        return -EACCES;

​

    base = dasd_device_from_gendisk(bdev->bd_disk);

    if (!base)

        return -ENODEV;

​

    dasd_enable_device(base);

    /* Formatting the dasd device can change the capacity. */

    mutex_lock(&bdev->bd_mutex);

    i_size_write(bdev->bd_inode,

             (loff_t)get_capacity(base->block->gdp) << 9);

    mutex_unlock(&bdev->bd_mutex);

    dasd_put_device(base);

    return 0;

}