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 * 2003/06/24 Louis D. Langholtz <ldl@aros.net>
9 * 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 #ifdef __KERNEL__
41
42 #include <linux/wait.h>
43 #include <linux/mutex.h>
44
45 /* values for flags field */
46 #define NBD_READ_ONLY 0x0001
47 #define NBD_WRITE_NOCHK 0x0002
48
49 struct request;
50
51 struct nbd_device {
52 int flags;
53 int harderror; /* Code of hard error */
54 struct socket * sock;
55 struct file * file; /* If == NULL, device is not ready, yet */
56 int magic;
57
58 spinlock_t queue_lock;
59 struct list_head queue_head;/* Requests are added here... */
60 struct request *active_req;
61 wait_queue_head_t active_wq;
62
63 struct mutex tx_lock;
64 struct gendisk *disk;
65 int blksize;
66 u64 bytesize;
67 pid_t pid; /* pid of nbd-client, if attached */
68 int xmit_timeout;
69 };
70
71 #endif
72
73 /* These are sent over the network in the request/reply magic fields */
74
75 #define NBD_REQUEST_MAGIC 0x25609513
76 #define NBD_REPLY_MAGIC 0x67446698
77 /* Do *not* use magics: 0x12560953 0x96744668. */
78
79 /*
80 * This is the packet used for communication between client and
81 * server. All data are in network byte order.
82 */
83 struct nbd_request {
84 __be32 magic;
85 __be32 type; /* == READ || == WRITE */
86 char handle[8];
87 __be64 from;
88 __be32 len;
89 }
90 #ifdef __GNUC__
91 __attribute__ ((packed))
92 #endif
93 ;
94
95 /*
96 * This is the reply packet that nbd-server sends back to the client after
97 * it has completed an I/O request (or an error occurs).
98 */
99 struct nbd_reply {
100 __be32 magic;
101 __be32 error; /* 0 = ok, else error */
102 char handle[8]; /* handle you got from request */
103 };
104 #endif
105
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