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/******************************************************************************
*******************************************************************************
**
** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
** Copyright (C) 2004 Red Hat, Inc. All rights reserved.
**
** This copyrighted material is made available to anyone wishing to use,
** modify, copy, or redistribute it subject to the terms and conditions
** of the GNU General Public License v.2.
**
*******************************************************************************
******************************************************************************/
#ifndef LINUX_GNBD_H
#define LINUX_GNBD_H
#define GNBD_DO_IT _IO( 0xab, 0x20 )
#define GNBD_CLEAR_QUE _IO( 0xab, 0x21 )
#define GNBD_PRINT_DEBUG _IO( 0xab, 0x22 )
#define GNBD_DISCONNECT _IO( 0xab, 0x23 )
#define GNBD_PING _IO( 0xab, 0x24 )
#define GNBD_GET_TIME _IO( 0xab, 0x25 )
enum {
GNBD_CMD_READ = 0,
GNBD_CMD_WRITE = 1,
GNBD_CMD_DISC = 2,
GNBD_CMD_PING = 3
};
#define gnbd_cmd(req) ((req)->cmd[0])
#define MAX_GNBD 128
/* values for flags field */
#define GNBD_READ_ONLY 0x0001
/* userspace doesn't need the gnbd_device structure */
#ifdef __KERNEL__
struct gnbd_device {
unsigned short int flags;
struct socket * sock;
struct file * file; /* If == NULL, device is not ready, yet */
int magic;
spinlock_t queue_lock;
spinlock_t open_lock;
struct list_head queue_head;/* Requests are added here... */
struct semaphore tx_lock;
struct gendisk *disk;
pid_t receiver_pid;
struct semaphore do_it_lock;
int open_count;
struct class_device class_dev;
unsigned short int server_port;
char *server_name;
char name[32];
unsigned long last_received;
struct block_device *bdev;
};
#endif /* __KERNEL__ */
/* These are sent over the network in the request/reply magic fields */
#define GNBD_REQUEST_MAGIC 0x37a07e00
#define GNBD_REPLY_MAGIC 0x41f09370
#define GNBD_KEEP_ALIVE_MAGIC 0x5B46D8C2
/* Do *not* use magics: 0x12560953 0x96744668. */
/*
* This is the packet used for communication between client and
* server. All data are in network byte order.
*/
struct gnbd_request {
uint32_t magic;
uint32_t type; /* == READ || == WRITE why so long */
char handle[8]; /* why is this a char array instead of a u64 */
uint64_t from;
uint32_t len;
}
#ifdef __GNUC__
__attribute__ ((packed))
#endif /* __GNUC__ */
;
/*
* This is the reply packet that gnbd-server sends back to the client after
* it has completed an I/O request (or an error occurs).
*/
#define SIZE_OF_REPLY 16
struct gnbd_reply {
uint32_t magic;
uint32_t error; /* 0 = ok, else error */
char handle[8]; /* handle you got from request */
};
struct do_it_req_s {
unsigned int minor;
int sock_fd;
};
typedef struct do_it_req_s do_it_req_t;
#endif /* LINUX_GNBD_H */

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