f7ca2bbe44
This feature comes from the fact that we rely memory-backed md(4) in our build process heavily. However, if the build goes haywire the allocated resources (i.e. swap and memory-backed md(4)'s) need to be purged. It is extremely useful to have ability to attach arbitrary labels to each of the virtual disks so that they can be identified and GC'ed if neecessary. MFC after: 4 weeks Differential Revision: https://reviews.freebsd.org/D10457
95 lines
3.7 KiB
C
95 lines
3.7 KiB
C
/*-
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: fdioctl.h 1.1 90/07/09$
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*
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* @(#)vnioctl.h 8.1 (Berkeley) 6/10/93
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*
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* From: src/sys/sys/vnioctl.h,v 1.4
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_MDIOCTL_H_
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#define _SYS_MDIOCTL_H_
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enum md_types {MD_MALLOC, MD_PRELOAD, MD_VNODE, MD_SWAP, MD_NULL};
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/*
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* Ioctl definitions for memory disk pseudo-device.
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*/
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#define MDNPAD 96
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struct md_ioctl {
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unsigned md_version; /* Structure layout version */
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unsigned md_unit; /* unit number */
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enum md_types md_type ; /* type of disk */
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char *md_file; /* pathname of file to mount */
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off_t md_mediasize; /* size of disk in bytes */
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unsigned md_sectorsize; /* sectorsize */
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unsigned md_options; /* options */
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u_int64_t md_base; /* base address */
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int md_fwheads; /* firmware heads */
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int md_fwsectors; /* firmware sectors */
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char *md_label; /* label of the device */
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int md_pad[MDNPAD]; /* padding for future ideas */
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};
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#define MD_NAME "md"
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#define MDCTL_NAME "mdctl"
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#define MDIOVERSION 0
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/*
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* Before you can use a unit, it must be configured with MDIOCSET.
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* The configuration persists across opens and closes of the device;
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* an MDIOCCLR must be used to reset a configuration. An attempt to
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* MDIOCSET an already active unit will return EBUSY.
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*/
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#define MDIOCATTACH _IOWR('m', 0, struct md_ioctl) /* attach disk */
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#define MDIOCDETACH _IOWR('m', 1, struct md_ioctl) /* detach disk */
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#define MDIOCQUERY _IOWR('m', 2, struct md_ioctl) /* query status */
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#define MDIOCLIST _IOWR('m', 3, struct md_ioctl) /* query status */
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#define MDIOCRESIZE _IOWR('m', 4, struct md_ioctl) /* resize disk */
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#define MD_CLUSTER 0x01 /* Don't cluster */
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#define MD_RESERVE 0x02 /* Pre-reserve swap */
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#define MD_AUTOUNIT 0x04 /* Assign next free unit */
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#define MD_READONLY 0x08 /* Readonly mode */
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#define MD_COMPRESS 0x10 /* Compression mode */
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#define MD_FORCE 0x20 /* Don't try to prevent foot-shooting */
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#define MD_ASYNC 0x40 /* Asynchronous mode */
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#define MD_VERIFY 0x80 /* Open file with O_VERIFY (vnode only) */
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#endif /* _SYS_MDIOCTL_H_*/
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