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Commit 597592d9 authored by Ian Campbell's avatar Ian Campbell Committed by Linus Torvalds
Browse files

xen: Implement getgeo for Xen virtual block device. 



The below implements the getgeo hook for Xen block devices. Extracted
from the xen-unstable tree where it has been used for ages.

It is useful to have because it allows things like grub2 (used by the
Debian installer images) to work in a guest domain without having to
sprinkle Xen specific hacks around the place.

Signed-off-by: default avatarIan Campbell <ijc@hellion.org.uk>
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 0f151e8b

drivers/block/xen-blkfront.c

+18 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ 


#include <linux/interrupt.h>

#include <linux/blkdev.h>

#include <linux/hdreg.h>

#include <linux/module.h>



#include <xen/xenbus.h>
@@ -135,6 +136,22 @@ static void blkif_restart_queue_callback(void *arg) 
	schedule_work(&info->work);

}



int blkif_getgeo(struct block_device *bd, struct hd_geometry *hg)

{

	/* We don't have real geometry info, but let's at least return

	   values consistent with the size of the device */

	sector_t nsect = get_capacity(bd->bd_disk);

	sector_t cylinders = nsect;



	hg->heads = 0xff;

	hg->sectors = 0x3f;

	sector_div(cylinders, hg->heads * hg->sectors);

	hg->cylinders = cylinders;

	if ((sector_t)(hg->cylinders + 1) * hg->heads * hg->sectors < nsect)

		hg->cylinders = 0xffff;

	return 0;

}



/*

 * blkif_queue_request

 *
@@ -937,6 +954,7 @@ static struct block_device_operations xlvbd_block_fops = 
	.owner = THIS_MODULE,

	.open = blkif_open,

	.release = blkif_release,

	.getgeo = blkif_getgeo,

};