mirror of
https://github.com/xen-project/xen.git
synced 2026-10-29 18:50:05 +01:00
bitkeeper revision 1.1159.97.1 (415c1355G0vdS-y56tfhWtVP73n6pQ)
The blkfront driver now invents a disk geometry consistent with the size of the device if anyone calls the HDIO_GETGEO ioctl
This commit is contained in:
iap10@labyrinth.cl.cam.ac.uk committed
1 parent
fc0d7e490c
commit
fbf6ed06e0
1 file changed
+26
-8
@@ -554,6 +554,8 @@ int blkif_ioctl(struct inode *inode, struct file *filep,
|
||||
struct gendisk *gd;
|
||||
struct hd_struct *part;
|
||||
int i;
|
||||
unsigned short cylinders;
|
||||
byte heads, sectors;
|
||||
|
||||
/* NB. No need to check permissions. That is done for us. */
|
||||
|
||||
@@ -598,23 +600,39 @@ int blkif_ioctl(struct inode *inode, struct file *filep,
|
||||
break;
|
||||
|
||||
case HDIO_GETGEO:
|
||||
/* note: these values are complete garbage */
|
||||
DPRINTK_IOCTL(" HDIO_GETGEO: %x\n", HDIO_GETGEO);
|
||||
if (!argument) return -EINVAL;
|
||||
|
||||
/* We don't have real geometry info, but let's at least return
|
||||
values consistent with the size of the device */
|
||||
|
||||
heads = 0xff;
|
||||
sectors = 0x3f;
|
||||
cylinders = part->nr_sects / (heads * sectors);
|
||||
|
||||
if (put_user(0x00, (unsigned long *) &geo->start)) return -EFAULT;
|
||||
if (put_user(0xff, (byte *)&geo->heads)) return -EFAULT;
|
||||
if (put_user(0x3f, (byte *)&geo->sectors)) return -EFAULT;
|
||||
if (put_user(0x106, (unsigned short *)&geo->cylinders)) return -EFAULT;
|
||||
if (put_user(heads, (byte *)&geo->heads)) return -EFAULT;
|
||||
if (put_user(sectors, (byte *)&geo->sectors)) return -EFAULT;
|
||||
if (put_user(cylinders, (unsigned short *)&geo->cylinders)) return -EFAULT;
|
||||
|
||||
return 0;
|
||||
|
||||
case HDIO_GETGEO_BIG:
|
||||
/* note: these values are complete garbage */
|
||||
DPRINTK_IOCTL(" HDIO_GETGEO_BIG: %x\n", HDIO_GETGEO_BIG);
|
||||
if (!argument) return -EINVAL;
|
||||
|
||||
/* We don't have real geometry info, but let's at least return
|
||||
values consistent with the size of the device */
|
||||
|
||||
heads = 0xff;
|
||||
sectors = 0x3f;
|
||||
cylinders = part->nr_sects / (heads * sectors);
|
||||
|
||||
if (put_user(0x00, (unsigned long *) &geo->start)) return -EFAULT;
|
||||
if (put_user(0xff, (byte *)&geo->heads)) return -EFAULT;
|
||||
if (put_user(0x3f, (byte *)&geo->sectors)) return -EFAULT;
|
||||
if (put_user(0x106, (unsigned int *) &geo->cylinders)) return -EFAULT;
|
||||
if (put_user(heads, (byte *)&geo->heads)) return -EFAULT;
|
||||
if (put_user(sectors, (byte *)&geo->sectors)) return -EFAULT;
|
||||
if (put_user(cylinders, (unsigned int *) &geo->cylinders)) return -EFAULT;
|
||||
|
||||
return 0;
|
||||
|
||||
case CDROMMULTISESSION:
|
||||
|
||||