/******************************************************************************
 * block.h
 * 
 * Shared definitions between all levels of XenLinux Virtual block devices.
 * 
 * Copyright (c) 2003-2004, Keir Fraser & Steve Hand
 * Modifications by Mark A. Williamson are (c) Intel Research Cambridge
 * Copyright (c) 2004-2005, Christian Limpach
 * 
 * This file may be distributed separately from the Linux kernel, or
 * incorporated into other software packages, subject to the following license:
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this source file (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy, modify,
 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef __XEN_DRIVERS_BLOCK_H__
#define __XEN_DRIVERS_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 <linux/devfs_fs_kernel.h>
#include <asm-xen/xen-public/xen.h>
#include <asm-xen/xen-public/io/blkif.h>
#include <asm-xen/xen-public/io/ring.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

struct xlbd_type_info {
    int partn_shift;
    int partn_per_major;
    int devs_per_major;
    char *devname;
    char *diskname;
};

/*
 * We have one of these per vbd, whether ide, scsi or 'other'.  They
 * hang in private_data off the gendisk structure. We may end up
 * putting all kinds of interesting stuff here :-)
 */
struct xlbd_major_info {
    int major;
    int index;
    int usage;
    struct xlbd_type_info *type;
};

struct xlbd_disk_info {
    int xd_device;
    struct xlbd_major_info *mi;
};

typedef struct xen_block {
    int usage;
} xen_block_t;

extern struct request_queue *xlbd_blk_queue;
extern spinlock_t blkif_io_lock;

extern int blkif_open(struct inode *inode, struct file *filep);
extern int blkif_release(struct inode *inode, struct file *filep);
extern int blkif_ioctl(struct inode *inode, struct file *filep,
                       unsigned command, unsigned long argument);
extern int blkif_check(dev_t dev);
extern int blkif_revalidate(dev_t dev);
extern void blkif_control_send(blkif_request_t *req, blkif_response_t *rsp);
#ifdef CONFIG_XEN_BLKDEV_GRANT
extern void blkif_control_probe_send(
    blkif_request_t *req, blkif_response_t *rsp, unsigned long address);
#endif
extern void do_blkif_request (request_queue_t *rq); 

extern void xlvbd_update_vbds(void);

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

#endif /* __XEN_DRIVERS_BLOCK_H__ */