cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nbd.h (3039B)

      1/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
      2/*
      3 * 1999 Copyright (C) Pavel Machek, pavel@ucw.cz. This code is GPL.
      4 * 1999/11/04 Copyright (C) 1999 VMware, Inc. (Regis "HPReg" Duchesne)
      5 *            Made nbd_end_request() use the io_request_lock
      6 * 2001 Copyright (C) Steven Whitehouse
      7 *            New nbd_end_request() for compatibility with new linux block
      8 *            layer code.
      9 * 2003/06/24 Louis D. Langholtz <ldl@aros.net>
     10 *            Removed unneeded blksize_bits field from nbd_device struct.
     11 *            Cleanup PARANOIA usage & code.
     12 * 2004/02/19 Paul Clements
     13 *            Removed PARANOIA, plus various cleanup and comments
     14 */
     15
     16#ifndef _UAPILINUX_NBD_H
     17#define _UAPILINUX_NBD_H
     18
     19#include <linux/types.h>
     20
     21#define NBD_SET_SOCK	_IO( 0xab, 0 )
     22#define NBD_SET_BLKSIZE	_IO( 0xab, 1 )
     23#define NBD_SET_SIZE	_IO( 0xab, 2 )
     24#define NBD_DO_IT	_IO( 0xab, 3 )
     25#define NBD_CLEAR_SOCK	_IO( 0xab, 4 )
     26#define NBD_CLEAR_QUE	_IO( 0xab, 5 )
     27#define NBD_PRINT_DEBUG	_IO( 0xab, 6 )
     28#define NBD_SET_SIZE_BLOCKS	_IO( 0xab, 7 )
     29#define NBD_DISCONNECT  _IO( 0xab, 8 )
     30#define NBD_SET_TIMEOUT _IO( 0xab, 9 )
     31#define NBD_SET_FLAGS   _IO( 0xab, 10)
     32
     33enum {
     34	NBD_CMD_READ = 0,
     35	NBD_CMD_WRITE = 1,
     36	NBD_CMD_DISC = 2,
     37	NBD_CMD_FLUSH = 3,
     38	NBD_CMD_TRIM = 4
     39};
     40
     41/* values for flags field, these are server interaction specific. */
     42#define NBD_FLAG_HAS_FLAGS	(1 << 0) /* nbd-server supports flags */
     43#define NBD_FLAG_READ_ONLY	(1 << 1) /* device is read-only */
     44#define NBD_FLAG_SEND_FLUSH	(1 << 2) /* can flush writeback cache */
     45#define NBD_FLAG_SEND_FUA	(1 << 3) /* send FUA (forced unit access) */
     46/* there is a gap here to match userspace */
     47#define NBD_FLAG_SEND_TRIM	(1 << 5) /* send trim/discard */
     48#define NBD_FLAG_CAN_MULTI_CONN	(1 << 8)	/* Server supports multiple connections per export. */
     49
     50/* values for cmd flags in the upper 16 bits of request type */
     51#define NBD_CMD_FLAG_FUA	(1 << 16) /* FUA (forced unit access) op */
     52
     53/* These are client behavior specific flags. */
     54#define NBD_CFLAG_DESTROY_ON_DISCONNECT	(1 << 0) /* delete the nbd device on
     55						    disconnect. */
     56#define NBD_CFLAG_DISCONNECT_ON_CLOSE (1 << 1) /* disconnect the nbd device on
     57						*  close by last opener.
     58						*/
     59
     60/* userspace doesn't need the nbd_device structure */
     61
     62/* These are sent over the network in the request/reply magic fields */
     63
     64#define NBD_REQUEST_MAGIC 0x25609513
     65#define NBD_REPLY_MAGIC 0x67446698
     66/* Do *not* use magics: 0x12560953 0x96744668. */
     67
     68/*
     69 * This is the packet used for communication between client and
     70 * server. All data are in network byte order.
     71 */
     72struct nbd_request {
     73	__be32 magic;
     74	__be32 type;	/* == READ || == WRITE 	*/
     75	char handle[8];
     76	__be64 from;
     77	__be32 len;
     78} __attribute__((packed));
     79
     80/*
     81 * This is the reply packet that nbd-server sends back to the client after
     82 * it has completed an I/O request (or an error occurs).
     83 */
     84struct nbd_reply {
     85	__be32 magic;
     86	__be32 error;		/* 0 = ok, else error	*/
     87	char handle[8];		/* handle you got from request	*/
     88};
     89#endif /* _UAPILINUX_NBD_H */