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01: /*
02:  * 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL.
03:  * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne)
04:  *            Made nbd_end_request() use the io_request_lock
05:  * 2001 Copyright (C) Steven Whitehouse
06:  *            New nbd_end_request() for compatibility with new linux block
07:  *            layer code.
08:  * 2003/06/24 Louis D. Langholtz <ldl@aros.net>
09:  *            Removed unneeded blksize_bits field from nbd_device struct.
10:  *            Cleanup PARANOIA usage & code.
11:  * 2004/02/19 Paul Clements
12:  *            Removed PARANOIA, plus various cleanup and comments
13:  */
14: 
15: #ifndef LINUX_NBD_H
16: #define LINUX_NBD_H
17: 
18: #include <linux/types.h>
19: 
20: #define NBD_SET_SOCK    _IO( 0xab, 0 )
21: #define NBD_SET_BLKSIZE _IO( 0xab, 1 )
22: #define NBD_SET_SIZE    _IO( 0xab, 2 )
23: #define NBD_DO_IT       _IO( 0xab, 3 )
24: #define NBD_CLEAR_SOCK  _IO( 0xab, 4 )
25: #define NBD_CLEAR_QUE   _IO( 0xab, 5 )
26: #define NBD_PRINT_DEBUG _IO( 0xab, 6 )
27: #define NBD_SET_SIZE_BLOCKS     _IO( 0xab, 7 )
28: #define NBD_DISCONNECT  _IO( 0xab, 8 )
29: #define NBD_SET_TIMEOUT _IO( 0xab, 9 )
30: 
31: enum {
32:         NBD_CMD_READ = 0,
33:         NBD_CMD_WRITE = 1,
34:         NBD_CMD_DISC = 2
35: };
36: 
37: #define nbd_cmd(req) ((req)->cmd[0])
38: 
39: /* userspace doesn't need the nbd_device structure */
40: 
41: /* These are sent over the network in the request/reply magic fields */
42: 
43: #define NBD_REQUEST_MAGIC 0x25609513
44: #define NBD_REPLY_MAGIC 0x67446698
45: /* Do *not* use magics: 0x12560953 0x96744668. */
46: 
47: /*
48:  * This is the packet used for communication between client and
49:  * server. All data are in network byte order.
50:  */
51: struct nbd_request {
52:         __be32 magic;
53:         __be32 type;    /* == READ || == WRITE  */
54:         char handle[8];
55:         __be64 from;
56:         __be32 len;
57: } __attribute__((packed));
58: 
59: /*
60:  * This is the reply packet that nbd-server sends back to the client after
61:  * it has completed an I/O request (or an error occurs).
62:  */
63: struct nbd_reply {
64:         __be32 magic;
65:         __be32 error;           /* 0 = ok, else error   */
66:         char handle[8];         /* handle you got from request  */
67: };
68: #endif
69: 

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