/******************************************************************************
 * xl_block.h
 * 
 * Shared definitions between all levels of XenoLinux Virtual block devices.
 */

#ifndef __XL_BLOCK_H__
#define __XL_BLOCK_H__

#include <linux/config.h>
#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>

#include <linux/fs.h>
#include <linux/hdreg.h>
#include <linux/blkdev.h>
#include <linux/major.h>

#include <asm/hypervisor-ifs/hypervisor-if.h>
#include <asm/hypervisor-ifs/vbd.h>
#include <asm/io.h>
#include <asm/atomic.h>
#include <asm/uaccess.h>

#if 0
#define DPRINTK(_f, _a...) printk ( KERN_ALERT _f , ## _a )
#else
#define DPRINTK(_f, _a...) ((void)0)
#endif

#if 0
#define DPRINTK_IOCTL(_f, _a...) printk ( KERN_ALERT _f , ## _a )
#else
#define DPRINTK_IOCTL(_f, _a...) ((void)0)
#endif

/* Private gendisk->flags[] values. */
#define GENHD_FL_XENO        2 /* Is unit a Xen block device?  */
#define GENHD_FL_VIRT_PARTNS 4 /* Are unit partitions virtual? */

/*
 * We have one of these per vbd, whether ide, scsi or 'other'.
 * They hang in an array off the gendisk structure. We may end up putting
 * all kinds of interesting stuff here :-)
 */
typedef struct xl_disk {
    int usage;
} xl_disk_t;

/* Generic layer. */
extern int xenolinux_control_msg(int operration, char *buffer, int size);
extern int xenolinux_block_open(struct inode *inode, struct file *filep);
extern int xenolinux_block_release(struct inode *inode, struct file *filep);
extern int xenolinux_block_ioctl(struct inode *inode, struct file *filep,
                                 unsigned command, unsigned long argument);
extern int xenolinux_block_check(kdev_t dev);
extern int xenolinux_block_revalidate(kdev_t dev);
extern void do_xlblk_request (request_queue_t *rq); 


/* Virtual block-device subsystem. */
extern int  xlvbd_init(xen_disk_info_t *xdi);
extern void xlvbd_cleanup(void); 

#endif /* __XL_BLOCK_H__ */