116 lines
4.6 KiB
C
116 lines
4.6 KiB
C
/* $NetBSD: dkvar.h,v 1.32 2020/03/01 03:21:54 riastradh Exp $ */
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Roland C. Dowdeswell.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _DEV_DKVAR_H_
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#define _DEV_DKVAR_H_
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#include <sys/rndsource.h>
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struct pathbuf; /* from namei.h */
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/* literally this is not a softc, but is intended to be included in
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* the pseudo-disk's softc and passed to calls in dksubr.c. It
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* should include the common elements of the pseudo-disk's softc.
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* All elements that are included here should describe the external
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* representation of the disk to the higher layers, and flags that
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* are common to each of the pseudo-disk drivers.
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*/
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struct dk_softc {
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device_t sc_dev;
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u_int32_t sc_flags; /* flags */
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#define DK_XNAME_SIZE 8
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char sc_xname[DK_XNAME_SIZE]; /* external name */
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struct disk sc_dkdev; /* generic disk info */
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kmutex_t sc_iolock; /* protects buffer queue */
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struct bufq_state *sc_bufq; /* buffer queue */
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int sc_dtype; /* disk type */
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struct buf *sc_deferred; /* retry after start failed */
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int sc_busy; /* processing buffers */
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krndsource_t sc_rnd_source; /* entropy source */
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};
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/* sc_flags:
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* We separate the flags into two varieties, those that dksubr.c
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* understands and manipulates and those that it does not.
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*/
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#define DKF_INITED 0x00010000 /* unit has been initialised */
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#define DKF_WLABEL 0x00020000 /* label area is writable */
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#define DKF_LABELLING 0x00040000 /* unit is currently being labeled */
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#define DKF_WARNLABEL 0x00080000 /* warn if disklabel not present */
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#define DKF_LABELSANITY 0x00100000 /* warn if disklabel not sane */
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#define DKF_TAKEDUMP 0x00200000 /* allow dumping */
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#define DKF_KLABEL 0x00400000 /* keep label on close */
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#define DKF_VLABEL 0x00800000 /* label is valid */
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#define DKF_SLEEP 0x80000000 /* dk_start/dk_done may sleep */
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#define DKF_NO_RND 0x01000000 /* do not attach as rnd source */
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/* Mask of flags that dksubr.c understands, other flags are fair game */
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#define DK_FLAGMASK 0xffff0000
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#define DK_ATTACHED(_dksc) ((_dksc)->sc_flags & DKF_INITED)
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#define DK_BUSY(_dksc, _pmask) \
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(((_dksc)->sc_dkdev.dk_openmask & ~(_pmask)) || \
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((_dksc)->sc_dkdev.dk_bopenmask & (_pmask) && \
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((_dksc)->sc_dkdev.dk_copenmask & (_pmask))))
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#define DK_DUMP_RECURSIVE __BIT(0) /* this is a virtual disk */
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/*
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* Functions that are exported to the pseudo disk implementations:
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*/
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void dk_init(struct dk_softc *, device_t, int);
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void dk_attach(struct dk_softc *);
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void dk_detach(struct dk_softc *);
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int dk_open(struct dk_softc *, dev_t,
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int, int, struct lwp *);
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int dk_close(struct dk_softc *, dev_t,
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int, int, struct lwp *);
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void dk_strategy(struct dk_softc *, struct buf *);
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int dk_strategy_defer(struct dk_softc *, struct buf *);
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int dk_strategy_pending(struct dk_softc *);
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int dk_discard(struct dk_softc *, dev_t, off_t, off_t);
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void dk_start(struct dk_softc *, struct buf *);
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void dk_done(struct dk_softc *, struct buf *);
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void dk_drain(struct dk_softc *);
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int dk_size(struct dk_softc *, dev_t);
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int dk_ioctl(struct dk_softc *, dev_t,
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u_long, void *, int, struct lwp *);
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int dk_dump(struct dk_softc *, dev_t,
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daddr_t, void *, size_t, int);
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void dk_getdisklabel(struct dk_softc *, dev_t);
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void dk_getdefaultlabel(struct dk_softc *, struct disklabel *);
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#endif /* ! _DEV_DKVAR_H_ */
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