1/*
2 * 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL.
3 * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne)
4 *            Made nbd_end_request() use the io_request_lock
5 * 2001 Copyright (C) Steven Whitehouse
6 *            New nbd_end_request() for compatibility with new linux block
7 *            layer code.
8 */
9
10#ifndef LINUX_NBD_H
11#define LINUX_NBD_H
12
13#define NBD_SET_SOCK	_IO( 0xab, 0 )
14#define NBD_SET_BLKSIZE	_IO( 0xab, 1 )
15#define NBD_SET_SIZE	_IO( 0xab, 2 )
16#define NBD_DO_IT	_IO( 0xab, 3 )
17#define NBD_CLEAR_SOCK	_IO( 0xab, 4 )
18#define NBD_CLEAR_QUE	_IO( 0xab, 5 )
19#define NBD_PRINT_DEBUG	_IO( 0xab, 6 )
20#define NBD_SET_SIZE_BLOCKS	_IO( 0xab, 7 )
21#define NBD_DISCONNECT  _IO( 0xab, 8 )
22
23#ifdef MAJOR_NR
24
25#include <linux/locks.h>
26#include <asm/semaphore.h>
27
28#define LOCAL_END_REQUEST
29
30#include <linux/blk.h>
31
32#ifdef PARANOIA
33extern int requests_in;
34extern int requests_out;
35#endif
36
37static void
38nbd_end_request(struct request *req)
39{
40	struct buffer_head *bh;
41	unsigned nsect;
42	unsigned long flags;
43	int uptodate = (req->errors == 0) ? 1 : 0;
44
45#ifdef PARANOIA
46	requests_out++;
47#endif
48	spin_lock_irqsave(&io_request_lock, flags);
49	while((bh = req->bh) != NULL) {
50		nsect = bh->b_size >> 9;
51		blk_finished_io(nsect);
52		req->bh = bh->b_reqnext;
53		bh->b_reqnext = NULL;
54		bh->b_end_io(bh, uptodate);
55	}
56	blkdev_release_request(req);
57	spin_unlock_irqrestore(&io_request_lock, flags);
58}
59
60#define MAX_NBD 128
61
62struct nbd_device {
63	int refcnt;
64	int flags;
65	int harderror;		/* Code of hard error			*/
66#define NBD_READ_ONLY 0x0001
67#define NBD_WRITE_NOCHK 0x0002
68	struct socket * sock;
69	struct file * file; 		/* If == NULL, device is not ready, yet	*/
70	int magic;
71	spinlock_t queue_lock;
72	struct list_head queue_head;	/* Requests are added here...			*/
73	struct semaphore tx_lock;
74};
75#endif
76
77/* This now IS in some kind of include file...	*/
78
79/* These are send over network in request/reply magic field */
80
81#define NBD_REQUEST_MAGIC 0x25609513
82#define NBD_REPLY_MAGIC 0x67446698
83/* Do *not* use magics: 0x12560953 0x96744668. */
84
85/*
86 * This is packet used for communication between client and
87 * server. All data are in network byte order.
88 */
89struct nbd_request {
90	u32 magic;
91	u32 type;	/* == READ || == WRITE 	*/
92	char handle[8];
93	u64 from;
94	u32 len;
95}
96#ifdef __GNUC__
97	__attribute__ ((packed))
98#endif
99;
100
101struct nbd_reply {
102	u32 magic;
103	u32 error;		/* 0 = ok, else error	*/
104	char handle[8];		/* handle you got from request	*/
105};
106#endif
107