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.)
86 lines
3.3 KiB
C
86 lines
3.3 KiB
C
/* $NetBSD: cgdvar.h,v 1.2 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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/* ioctl(2) code */
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struct cgd_ioctl {
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char *ci_disk;
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int ci_flags;
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int ci_unit;
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size_t ci_size;
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char *ci_alg;
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char *ci_ivmethod;
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size_t ci_keylen;
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char *ci_key;
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size_t ci_blocksize;
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};
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#ifdef _KERNEL
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#include <dev/cgd_crypto.h>
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/* This cryptdata structure is here rather than cgd_crypto.h, since
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* it stores local state which will not be generalised beyond the
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* cgd driver.
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*/
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struct cryptdata {
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int cf_blocksize; /* block size (in bytes) */
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int cf_mode; /* Cipher Mode and IV Gen method */
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#define CGD_CIPHER_CBC_ENCBLKNO 1 /* CBC Mode w/ Enc Block Number */
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void *cf_priv; /* enc alg private data */
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};
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struct cgd_softc {
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struct dk_softc sc_dksc; /* generic disk interface */
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struct cryptinfo *sc_crypt; /* the alg/key/etc */
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struct vnode *sc_tvn; /* target device's vnode */
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dev_t sc_tdev; /* target device */
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char *sc_tpath; /* target device's path */
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caddr_t sc_data; /* emergency buffer */
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int sc_data_used; /* Really lame, we'll change */
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size_t sc_tpathlen; /* length of prior string */
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struct cryptdata sc_cdata; /* crypto data */
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struct cryptfuncs *sc_cfuncs; /* encryption functions */
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struct simplelock sc_slock; /* our lock */
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};
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#endif
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/* XXX XAX XXX elric: check these out properly. */
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#define CGDIOCSET _IOWR('F', 18, struct cgd_ioctl)
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#define CGDIOCCLR _IOW('F', 19, struct cgd_ioctl)
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