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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/uapi/linux/nbd.h
a50527ebf671e010715d542f614331f7c49e4294
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
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
15 #ifndef _UAPILINUX_NBD_H
16 #define _UAPILINUX_NBD_H
18 #include <linux/types.h>
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)
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. */
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 */
52 /* These are client behavior specific flags. */
53 #define NBD_CFLAG_DESTROY_ON_DISCONNECT (1 << 0) /* delete the nbd device on
56 /* userspace doesn't need the nbd_device structure */
58 /* These are sent over the network in the request/reply magic fields */
60 #define NBD_REQUEST_MAGIC 0x25609513
61 #define NBD_REPLY_MAGIC 0x67446698
62 /* Do *not* use magics: 0x12560953 0x96744668. */
65 * This is the packet used for communication between client and
66 * server. All data are in network byte order.
70 __be32 type
; /* == READ || == WRITE */
74 } __attribute__((packed
));
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).
82 __be32 error
; /* 0 = ok, else error */
83 char handle
[8]; /* handle you got from request */
85 #endif /* _UAPILINUX_NBD_H */