befeae8929
o expect the disk's start routine to return an int. If the int is non-zero, we enqueue the request and try again later. o have a dk_start() routine which runs the request queue. o have a dk_iodone() function which should be called by the driver using the framwork from its iodone. dk_iodone will retry the queue since presumably further progress may be possible once a request is complete. It is required that the underlying driver have the resources to keep at least one transaction in flight at any time. Modified cgd to: o be able to keep one transaction in flight at any time (almost) by keeping a buffer of size MAXPHYS in its softc and use it. We still need to make the cgd_cbufpool per device rather than global and provide a low water mark for it. Addresses PR: kern/24715 (at least according to the submitter.)
123 lines
5.0 KiB
C
123 lines
5.0 KiB
C
/* $NetBSD: dkvar.h,v 1.4 2004/03/27 23:23:06 elric 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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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struct dk_geom {
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u_int32_t pdg_secsize;
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u_int32_t pdg_nsectors;
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u_int32_t pdg_ntracks;
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u_int32_t pdg_ncylinders;
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};
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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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void *sc_osc; /* the softc of the underlying
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* driver */
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u_int32_t sc_flags; /* flags */
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size_t sc_size; /* size of disk */
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struct dk_geom sc_geom; /* geometry info */
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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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struct lock sc_lock; /* the lock */
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struct bufq_state sc_bufq; /* buffer queue */
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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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/* Mask of flags that dksubr.c understands, other flags are fair game */
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#define DK_FLAGMASK 0xffff0000
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/*
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* This defines the interface to the routines in dksubr.c. This
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* should be a single static structure per pseudo-disk driver.
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* We only define the functions that we currently need.
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*/
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struct dk_intf {
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int di_dtype; /* disk type */
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char *di_dkname; /* disk type name */
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int (*di_open)(dev_t, int, int, struct proc *);
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int (*di_close)(dev_t, int, int, struct proc *);
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void (*di_strategy)(struct buf *);
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int (*di_diskstart)(struct dk_softc *, struct buf *);
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};
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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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/*
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* Functions that are exported to the pseudo disk implementations:
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*/
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void dk_sc_init(struct dk_softc *, void *, char *);
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int dk_open(struct dk_intf *, struct dk_softc *, dev_t,
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int, int, struct proc *);
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int dk_close(struct dk_intf *, struct dk_softc *, dev_t,
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int, int, struct proc *);
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void dk_strategy(struct dk_intf *, struct dk_softc *, struct buf *);
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void dk_start(struct dk_intf *, struct dk_softc *);
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void dk_iodone(struct dk_intf *, struct dk_softc *);
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int dk_size(struct dk_intf *, struct dk_softc *, dev_t);
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int dk_ioctl(struct dk_intf *, struct dk_softc *, dev_t,
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u_long, caddr_t, int, struct proc *);
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int dk_dump(struct dk_intf *, struct dk_softc *, dev_t,
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daddr_t, caddr_t, size_t);
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void dk_getdisklabel(struct dk_intf *, struct dk_softc *, dev_t);
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void dk_getdefaultlabel(struct dk_intf *, struct dk_softc *,
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struct disklabel *);
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int dk_lookup(char *, struct proc *, struct vnode **);
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