Messages in this thread Patch in this message | | | Date | Thu, 21 Feb 2008 13:03:45 -0800 | From | Jeremy Fitzhardinge <> | Subject | [PATCH] xen: Implement getgeo for Xen virtual block device. |
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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: Ian Campbell <ijc@hellion.org.uk> From: Ian Campbell <ijc@hellion.org.uk> Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
--- drivers/block/xen-blkfront.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
=================================================================== --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -37,6 +37,7 @@ #include <linux/interrupt.h> #include <linux/blkdev.h> +#include <linux/hdreg.h> #include <linux/module.h> #include <xen/xenbus.h> @@ -134,6 +135,22 @@ static void blkif_restart_queue_callback { struct blkfront_info *info = (struct blkfront_info *)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; } /* @@ -946,6 +963,7 @@ static struct block_device_operations xl .owner = THIS_MODULE, .open = blkif_open, .release = blkif_release, + .getgeo = blkif_getgeo, };
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