linux-next/include/linux/nbd.h

/*
 * 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/wait.h>
#include <linux/mutex.h>
#include <uapi/linux/nbd.h>

struct request;

struct nbd_device {
	int flags;
	int harderror;		/* Code of hard error			*/
	struct socket * sock;	/* If == NULL, device is not ready, yet	*/
	int magic;

	spinlock_t queue_lock;
	struct list_head queue_head;	/* Requests waiting result */
	struct request *active_req;
	wait_queue_head_t active_wq;
	struct list_head waiting_queue;	/* Requests to be sent */
	wait_queue_head_t waiting_wq;

	struct mutex tx_lock;
	struct gendisk *disk;
	int blksize;
	u64 bytesize;
	pid_t pid; /* pid of nbd-client, if attached */
	int xmit_timeout;
	int disconnect; /* a disconnect has been requested by user */
};

#endif