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#include <linux/kernel.h>
#include <asm/hypervisor.h>
#include <linux/fs.h>
#include <linux/blk.h>
#include <linux/slab.h>
#include <linux/genhd.h>
#include <asm/hypervisor-ifs/block.h>
#include <linux/pagemap.h>
#include "check.h"
#include "xeno.h"
extern int xenolinux_control_msg(int operration, char *buffer, int size);
extern unsigned short xldev_to_physdev(kdev_t xldev);
/* Grab the physdisk partitions list from the hypervisor. */
int xeno_partition(struct gendisk *hd,
struct block_device *bdev,
unsigned long first_sec,
int first_part_minor)
{
physdisk_probebuf_t *buf;
int i, minor;
/* Privileged domains can read partition info themselves. */
if (start_info.flags & SIF_PRIVILEGED)
return 0;
/* This only deals with raw/direct devices (IDE & SCSI). */
switch ( xldev_to_physdev(bdev->bd_dev) & XENDEV_TYPE_MASK )
{
case XENDEV_IDE:
case XENDEV_SCSI:
break;
default:
return 0;
}
if ( (buf = kmalloc(sizeof(*buf), GFP_KERNEL)) == NULL )
return -ENOMEM;
buf->domain = start_info.dom_id;
buf->start_ind = 0;
buf->n_aces = PHYSDISK_MAX_ACES_PER_REQUEST;
xenolinux_control_msg(XEN_BLOCK_PHYSDEV_PROBE, (char *)buf,
sizeof(*buf));
if ( buf->n_aces == PHYSDISK_MAX_ACES_PER_REQUEST )
printk(KERN_ALERT "Too many returns for xeno partition parser\n");
/* Check for access to whole disk, allowing direct p.t. access. */
for ( i = 0; i < buf->n_aces; i++ )
{
if ( (buf->entries[i].device == xldev_to_physdev(bdev->bd_dev)) &&
(buf->entries[i].partition == 0) )
{
kfree(buf);
return 0;
}
}
/* No direct access so trawl through the access lists instead. */
for ( i = 0; i < buf->n_aces; i++ )
{
if (buf->entries[i].device != xldev_to_physdev(bdev->bd_dev))
continue;
if (!(buf->entries[i].mode & PHYSDISK_MODE_W))
{
if (!(buf->entries[i].mode & PHYSDISK_MODE_R))
continue;
set_device_ro(bdev->bd_dev, 1);
}
minor = buf->entries[i].partition + first_part_minor - 1;
add_gd_partition(hd,
minor,
buf->entries[i].start_sect,
buf->entries[i].n_sectors);
}
kfree(buf);
printk("\n");
return 1;
}
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