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Add virtio disk identification ioctl

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Return serial string to the guest application via
ioctl driver call.

Note this form of interface to the guest userland
was the consensus when the prior version using
the ATA_IDENTIFY came under dispute.

Signed-off-by: john cooper <john.cooper@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
john cooper 2010-03-25 01:34:02 -04:00 committed by Rusty Russell
parent 4cb2ea28c5
commit 234f2725a5
1 changed files with 10 additions and 0 deletions
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10
drivers/block/virtio_blk.c
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@ -225,6 +225,16 @@ static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
struct gendisk *disk = bdev->bd_disk;
struct virtio_blk *vblk = disk->private_data;
if (cmd == 'VBID') {
void __user *usr_data = (void __user *)data;
char id_str[VIRTIO_BLK_ID_BYTES];
int err;
err = virtblk_get_id(disk, id_str);
if (!err && copy_to_user(usr_data, id_str, VIRTIO_BLK_ID_BYTES))
err = -EFAULT;
return err;
}
/*
* Only allow the generic SCSI ioctls if the host can support it.
*/