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| author | Ian Campbell <ijc@hellion.org.uk> | 2008-02-21 13:03:45 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-21 16:19:13 -0800 |
| commit | 597592d951cdca8e5edb29f7e8174f633a69685a (patch) | |
| tree | 7bbdf03e4cdc94086489616c65759962e6fb28f1 /drivers | |
| parent | 0f151e8b214c1df3f571020b849382933f2cdce7 (diff) | |
| download | lwn-597592d951cdca8e5edb29f7e8174f633a69685a.tar.gz lwn-597592d951cdca8e5edb29f7e8174f633a69685a.zip | |
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: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/block/xen-blkfront.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 8afce67c0aa5..9c6f3f99208d 100644 --- 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> @@ -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, }; |