Linux kernel mirror (for testing)
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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 _UAPILINUX_NBD_H
16#define _UAPILINUX_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#define NBD_SET_FLAGS _IO( 0xab, 10)
31
32enum {
33 NBD_CMD_READ = 0,
34 NBD_CMD_WRITE = 1,
35 NBD_CMD_DISC = 2,
36 NBD_CMD_FLUSH = 3,
37 NBD_CMD_TRIM = 4
38};
39
40/* values for flags field, these are server interaction specific. */
41#define NBD_FLAG_HAS_FLAGS (1 << 0) /* nbd-server supports flags */
42#define NBD_FLAG_READ_ONLY (1 << 1) /* device is read-only */
43#define NBD_FLAG_SEND_FLUSH (1 << 2) /* can flush writeback cache */
44#define NBD_FLAG_SEND_FUA (1 << 3) /* send FUA (forced unit access) */
45/* there is a gap here to match userspace */
46#define NBD_FLAG_SEND_TRIM (1 << 5) /* send trim/discard */
47#define NBD_FLAG_CAN_MULTI_CONN (1 << 8) /* Server supports multiple connections per export. */
48
49/* values for cmd flags in the upper 16 bits of request type */
50#define NBD_CMD_FLAG_FUA (1 << 16) /* FUA (forced unit access) op */
51
52/* These are client behavior specific flags. */
53#define NBD_CFLAG_DESTROY_ON_DISCONNECT (1 << 0) /* delete the nbd device on
54 disconnect. */
55
56/* userspace doesn't need the nbd_device structure */
57
58/* These are sent over the network in the request/reply magic fields */
59
60#define NBD_REQUEST_MAGIC 0x25609513
61#define NBD_REPLY_MAGIC 0x67446698
62/* Do *not* use magics: 0x12560953 0x96744668. */
63
64/*
65 * This is the packet used for communication between client and
66 * server. All data are in network byte order.
67 */
68struct nbd_request {
69 __be32 magic;
70 __be32 type; /* == READ || == WRITE */
71 char handle[8];
72 __be64 from;
73 __be32 len;
74} __attribute__((packed));
75
76/*
77 * This is the reply packet that nbd-server sends back to the client after
78 * it has completed an I/O request (or an error occurs).
79 */
80struct nbd_reply {
81 __be32 magic;
82 __be32 error; /* 0 = ok, else error */
83 char handle[8]; /* handle you got from request */
84};
85#endif /* _UAPILINUX_NBD_H */