202 lines
3.7 KiB
C
202 lines
3.7 KiB
C
/* $NetBSD: buffercache.c,v 1.3 2007/08/09 09:11:57 pooka Exp $ */
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/*
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* Copyright (c) 2007 Antti Kantee. All Rights Reserved.
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*
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* Development of this software was supported by Google Summer of Code.
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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 AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 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 OR
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* 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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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/buf.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/queue.h>
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#include "rumpuser.h"
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#define BQUEUES 3
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struct bqueue {
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TAILQ_HEAD(,buf) bq_queue;
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uint64_t bq_bytes;
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} bufqueues[BQUEUES];
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int
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bread(struct vnode *vp, daddr_t blkno, int size, struct kauth_cred *cred,
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struct buf **bpp)
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{
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struct buf *bp;
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bp = getblk(vp, blkno, size, 0, 0);
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bp->b_flags = B_READ;
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VOP_STRATEGY(vp, bp);
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bp->b_flags = B_BUSY;
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*bpp = bp;
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return 0;
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}
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int
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breadn(struct vnode *vp, daddr_t blkno, int size, daddr_t *rablks,
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int *rasizes, int nrablks, struct kauth_cred *cred, struct buf **bpp)
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{
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return bread(vp, blkno, size, cred, bpp);
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}
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int
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bwrite(struct buf *bp)
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{
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bp->b_flags &= ~B_READ;
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VOP_STRATEGY(bp->b_vp, bp);
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brelse(bp);
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return 0;
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}
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void
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bawrite(struct buf *bp)
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{
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bwrite(bp);
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}
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void
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bdwrite(struct buf *bp)
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{
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bwrite(bp);
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}
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void
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brelse(struct buf *bp)
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{
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rumpuser_free(bp->b_data);
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rumpuser_free(bp);
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}
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struct buf *
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getblk(struct vnode *vp, daddr_t blkno, int size, int slpflag, int slptimeo)
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{
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struct buf *bp;
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bp = rumpuser_malloc(sizeof(struct buf), 0);
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memset(bp, 0x55, sizeof(struct buf));
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bp->b_data = rumpuser_malloc(size, 0);
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bp->b_blkno = bp->b_lblkno = blkno;
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bp->b_bcount = bp->b_bufsize = size;
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bp->b_vp = vp;
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return bp;
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}
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struct buf *
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incore(struct vnode *vp, daddr_t blkno)
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{
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return NULL;
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}
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void
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allocbuf(struct buf *bp, int size, int preserve)
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{
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bp->b_bcount = bp->b_bufsize = size;
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bp->b_data = rumpuser_realloc(bp->b_data, size, 0);
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}
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void
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biodone(struct buf *bp)
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{
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/* nada */
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}
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/* everything is always instantly done */
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int
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biowait(struct buf *bp)
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{
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return 0;
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}
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struct buf *
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getiobuf()
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{
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return rumpuser_malloc(sizeof(struct buf), 0);
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}
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struct buf *
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getiobuf_nowait()
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{
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return rumpuser_malloc(sizeof(struct buf), 1);
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}
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void
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putiobuf(struct buf *bp)
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{
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rumpuser_free(bp);
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}
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void
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bgetvp(struct vnode *vp, struct buf *bp)
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{
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if (bp->b_vp)
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panic("%s: vp already set", __func__);
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bp->b_vp = vp;
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}
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void
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bremfree(struct buf *bp)
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{
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return;
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}
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void
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brelvp(struct buf *bp)
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{
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if (bp->b_vp == NULL)
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panic("%s: vp not set", __func__);
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bp->b_vp = NULL;
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}
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void
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reassignbuf(struct buf *bp, struct vnode *vp)
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{
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panic("%s: not implemented", __func__);
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}
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