You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
3.0 KiB
C
90 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
|
|
/*
|
|
* 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL.
|
|
* 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne)
|
|
* Made nbd_end_request() use the io_request_lock
|
|
* 2001 Copyright (C) Steven Whitehouse
|
|
* New nbd_end_request() for compatibility with new linux block
|
|
* layer code.
|
|
* 2003/06/24 Louis D. Langholtz <ldl@aros.net>
|
|
* Removed unneeded blksize_bits field from nbd_device struct.
|
|
* Cleanup PARANOIA usage & code.
|
|
* 2004/02/19 Paul Clements
|
|
* Removed PARANOIA, plus various cleanup and comments
|
|
*/
|
|
|
|
#ifndef LINUX_NBD_H
|
|
#define LINUX_NBD_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
#define NBD_SET_SOCK _IO( 0xab, 0 )
|
|
#define NBD_SET_BLKSIZE _IO( 0xab, 1 )
|
|
#define NBD_SET_SIZE _IO( 0xab, 2 )
|
|
#define NBD_DO_IT _IO( 0xab, 3 )
|
|
#define NBD_CLEAR_SOCK _IO( 0xab, 4 )
|
|
#define NBD_CLEAR_QUE _IO( 0xab, 5 )
|
|
#define NBD_PRINT_DEBUG _IO( 0xab, 6 )
|
|
#define NBD_SET_SIZE_BLOCKS _IO( 0xab, 7 )
|
|
#define NBD_DISCONNECT _IO( 0xab, 8 )
|
|
#define NBD_SET_TIMEOUT _IO( 0xab, 9 )
|
|
#define NBD_SET_FLAGS _IO( 0xab, 10)
|
|
|
|
enum {
|
|
NBD_CMD_READ = 0,
|
|
NBD_CMD_WRITE = 1,
|
|
NBD_CMD_DISC = 2,
|
|
NBD_CMD_FLUSH = 3,
|
|
NBD_CMD_TRIM = 4
|
|
};
|
|
|
|
/* values for flags field, these are server interaction specific. */
|
|
#define NBD_FLAG_HAS_FLAGS (1 << 0) /* nbd-server supports flags */
|
|
#define NBD_FLAG_READ_ONLY (1 << 1) /* device is read-only */
|
|
#define NBD_FLAG_SEND_FLUSH (1 << 2) /* can flush writeback cache */
|
|
#define NBD_FLAG_SEND_FUA (1 << 3) /* send FUA (forced unit access) */
|
|
/* there is a gap here to match userspace */
|
|
#define NBD_FLAG_SEND_TRIM (1 << 5) /* send trim/discard */
|
|
#define NBD_FLAG_CAN_MULTI_CONN (1 << 8) /* Server supports multiple connections per export. */
|
|
|
|
/* values for cmd flags in the upper 16 bits of request type */
|
|
#define NBD_CMD_FLAG_FUA (1 << 16) /* FUA (forced unit access) op */
|
|
|
|
/* These are client behavior specific flags. */
|
|
#define NBD_CFLAG_DESTROY_ON_DISCONNECT (1 << 0) /* delete the nbd device on
|
|
disconnect. */
|
|
#define NBD_CFLAG_DISCONNECT_ON_CLOSE (1 << 1) /* disconnect the nbd device on
|
|
* close by last opener.
|
|
*/
|
|
|
|
/* userspace doesn't need the nbd_device structure */
|
|
|
|
/* These are sent over the network in the request/reply magic fields */
|
|
|
|
#define NBD_REQUEST_MAGIC 0x25609513
|
|
#define NBD_REPLY_MAGIC 0x67446698
|
|
/* Do *not* use magics: 0x12560953 0x96744668. */
|
|
|
|
/*
|
|
* This is the packet used for communication between client and
|
|
* server. All data are in network byte order.
|
|
*/
|
|
struct nbd_request {
|
|
__be32 magic;
|
|
__be32 type; /* == READ || == WRITE */
|
|
char handle[8];
|
|
__be64 from;
|
|
__be32 len;
|
|
} __attribute__((packed));
|
|
|
|
/*
|
|
* This is the reply packet that nbd-server sends back to the client after
|
|
* it has completed an I/O request (or an error occurs).
|
|
*/
|
|
struct nbd_reply {
|
|
__be32 magic;
|
|
__be32 error; /* 0 = ok, else error */
|
|
char handle[8]; /* handle you got from request */
|
|
};
|
|
#endif /* LINUX_NBD_H */
|