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/*

 * 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL.

 * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne)

 *            Made nbd_end_request() use the io_request_lock

 * 2001 Copyright (C) Steven Whitehouse

 *            New nbd_end_request() for compatibility with new linux block

 *            layer code.

 * 2003/06/24 Louis D. Langholtz <ldl@aros.net>

 *            Removed unneeded blksize_bits field from nbd_device struct.

 *            Cleanup PARANOIA usage & code.

 * 2004/02/19 Paul Clements

 *            Removed PARANOIA, plus various cleanup and comments

 */

#ifndef LINUX_NBD_H

#define LINUX_NBD_H

#include <linux/types.h>

#define NBD_SET_SOCK    _IO( 0xab, 0 )

#define NBD_SET_BLKSIZE _IO( 0xab, 1 )

#define NBD_SET_SIZE    _IO( 0xab, 2 )

#define NBD_DO_IT       _IO( 0xab, 3 )

#define NBD_CLEAR_SOCK  _IO( 0xab, 4 )

#define NBD_CLEAR_QUE   _IO( 0xab, 5 )

#define NBD_PRINT_DEBUG _IO( 0xab, 6 )

#define NBD_SET_SIZE_BLOCKS     _IO( 0xab, 7 )

#define NBD_DISCONNECT  _IO( 0xab, 8 )

#define NBD_SET_TIMEOUT _IO( 0xab, 9 )

enum {

        NBD_CMD_READ = 0,

        NBD_CMD_WRITE = 1,

        NBD_CMD_DISC = 2

};

#define nbd_cmd(req) ((req)->cmd[0])

#define MAX_NBD 128

/* userspace doesn't need the nbd_device structure */

#ifdef __KERNEL__

#include <linux/wait.h>

#include <linux/mutex.h>

/* values for flags field */

#define NBD_READ_ONLY 0x0001

#define NBD_WRITE_NOCHK 0x0002

struct request;

struct nbd_device {

        int flags;

        int harderror;          /* Code of hard error                   */

        struct socket * sock;

        struct file * file;     /* If == NULL, device is not ready, yet */

        int magic;

        spinlock_t queue_lock;

        struct list_head queue_head;/* Requests are added here...       */

        struct request *active_req;

        wait_queue_head_t active_wq;

        struct mutex tx_lock;

        struct gendisk *disk;

        int blksize;

        u64 bytesize;

        pid_t pid; /* pid of nbd-client, if attached */

        int xmit_timeout;

};

#endif

/* These are sent over the network in the request/reply magic fields */

#define NBD_REQUEST_MAGIC 0x25609513

#define NBD_REPLY_MAGIC 0x67446698

/* 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 nbd_request {

        __be32 magic;

        __be32 type;    /* == READ || == WRITE  */

        char handle[8];

        __be64 from;

        __be32 len;

}

#ifdef __GNUC__

        __attribute__ ((packed))

#endif

;

/*

 * This is the reply packet that nbd-server sends back to the client after

 * it has completed an I/O request (or an error occurs).

 */

struct nbd_reply {

        __be32 magic;

        __be32 error;           /* 0 = ok, else error   */

        char handle[8];         /* handle you got from request  */

};

#endif