/* * 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. */#ifndef LINUX_NBD_H#define LINUX_NBD_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 )#ifdef MAJOR_NR#include <linux/locks.h>#include <asm/semaphore.h>#define LOCAL_END_REQUEST#include <linux/blk.h>#ifdef PARANOIAextern int requests_in;extern int requests_out;#endifstatic voidnbd_end_request(struct request *req){	struct buffer_head *bh;	unsigned nsect;	unsigned long flags;	int uptodate = (req->errors == 0) ? 1 : 0;#ifdef PARANOIA	requests_out++;#endif	spin_lock_irqsave(&io_request_lock, flags);	while((bh = req->bh) != NULL) {		nsect = bh->b_size >> 9;		blk_finished_io(nsect);		req->bh = bh->b_reqnext;		bh->b_reqnext = NULL;		bh->b_end_io(bh, uptodate);	}	blkdev_release_request(req);	spin_unlock_irqrestore(&io_request_lock, flags);}#define MAX_NBD 128struct nbd_device {	int refcnt;		int flags;	int harderror;		/* Code of hard error			*/#define NBD_READ_ONLY 0x0001#define NBD_WRITE_NOCHK 0x0002	struct socket * sock;	struct file * file; 		/* If == NULL, device is not ready, yet	*/	int magic;			/* FIXME: not if debugging is off	*/	struct list_head queue_head;	/* Requests are added here...			*/	struct semaphore queue_lock;};#endif/* This now IS in some kind of include file...	*//* These are send over network in request/reply magic field */#define NBD_REQUEST_MAGIC 0x25609513#define NBD_REPLY_MAGIC 0x67446698/* Do *not* use magics: 0x12560953 0x96744668. *//* * This is packet used for communication between client and * server. All data are in network byte order. */struct nbd_request {	u32 magic;	u32 type;	/* == READ || == WRITE 	*/	char handle[8];	u64 from;	u32 len;}#ifdef __GNUC__	__attribute__ ((packed))#endif;struct nbd_reply {	u32 magic;	u32 error;		/* 0 = ok, else error	*/	char handle[8];		/* handle you got from request	*/};#endif