linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 *  Code extracted from drivers/block/genhd.c

 *  Copyright (C) 1991-1998  Linus Torvalds

 *  Re-organised Feb 1998 Russell King

 *

 *  We now have independent partition support from the

 *  block drivers, which allows all the partition code to

 *  be grouped in one location, and it to be mostly self

 *  contained.

 */

​

#include <linux/init.h>

#include <linux/module.h>

#include <linux/fs.h>

#include <linux/slab.h>

#include <linux/kmod.h>

#include <linux/ctype.h>

#include <linux/genhd.h>

#include <linux/blktrace_api.h>

​

#include "partitions/check.h"

​

#ifdef CONFIG_BLK_DEV_MD

extern void md_autodetect_dev(dev_t dev);

#endif

/*

 * disk_name() is used by partition check code and the genhd driver.

 * It formats the devicename of the indicated disk into

 * the supplied buffer (of size at least 32), and returns

 * a pointer to that same buffer (for convenience).

 */

​

char *disk_name(struct gendisk *hd, int partno, char *buf)

{

    if (!partno)

        snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);

    else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))

        snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);

    else

        snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);

​

    return buf;

}

​

const char *bdevname(struct block_device *bdev, char *buf)

{

    return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);

}

​

EXPORT_SYMBOL(bdevname);

​

const char *bio_devname(struct bio *bio, char *buf)

{

    return disk_name(bio->bi_disk, bio->bi_partno, buf);

}

EXPORT_SYMBOL(bio_devname);

​

/*

 * There's very little reason to use this, you should really

 * have a struct block_device just about everywhere and use

 * bdevname() instead.

 */

const char *__bdevname(dev_t dev, char *buffer)

{

    scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",

                MAJOR(dev), MINOR(dev));

    return buffer;

}

​

EXPORT_SYMBOL(__bdevname);

​

static ssize_t part_partition_show(struct device *dev,

                   struct device_attribute *attr, char *buf)

{

    struct hd_struct *p = dev_to_part(dev);

​

    return sprintf(buf, "%d\n", p->partno);

}

​

static ssize_t part_start_show(struct device *dev,

                   struct device_attribute *attr, char *buf)

{

    struct hd_struct *p = dev_to_part(dev);

​

    return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);

}

​

ssize_t part_size_show(struct device *dev,

               struct device_attribute *attr, char *buf)

{