141 lines
3.5 KiB
C
141 lines
3.5 KiB
C
/* $NetBSD: v7fs_io.c,v 1.3 2013/06/28 14:49:14 christos Exp $ */
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/*-
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* Copyright (c) 2011 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 UCHIYAMA Yasushi.
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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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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: v7fs_io.c,v 1.3 2013/06/28 14:49:14 christos Exp $");
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#if defined _KERNEL_OPT
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#include "opt_v7fs.h"
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#endif
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#ifdef _KERNEL
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#include <sys/param.h>
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#else
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#endif
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#include "v7fs.h"
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#include "v7fs_impl.h"
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#if defined _KERNEL
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#define STATIC_BUFFER
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#endif
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#ifdef V7FS_IO_DEBUG
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#define DPRINTF(fmt, args...) printf("%s: " fmt, __func__, ##args)
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#else
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#define DPRINTF(fmt, args...) ((void)0)
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#endif
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void *
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scratch_read(struct v7fs_self *fs, daddr_t blk)
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{
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#ifdef STATIC_BUFFER
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int i;
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MEM_LOCK(fs);
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for (i = 0; i < V7FS_SELF_NSCRATCH; i++) {
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if (fs->scratch_free & (1 << i)) {
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fs->scratch_free &= ~(1 << i);
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break;
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}
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}
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if (i == V7FS_SELF_NSCRATCH) {
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DPRINTF("No scratch area. increase V7FS_SELF_NSCRATCH\n");
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assert(0);
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MEM_UNLOCK(fs);
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return NULL;
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}
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if (!fs->io.read(fs->io.cookie, fs->scratch[i], blk)) {
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DPRINTF("*** I/O error block %ld\n", (long)blk);
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fs->scratch_free |= (1 << i);
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MEM_UNLOCK(fs);
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return NULL;
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}
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MEM_UNLOCK(fs);
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/* Statistic */
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int n;
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if ((n = scratch_remain(fs)) < fs->scratch_remain)
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fs->scratch_remain = n;
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return fs->scratch[i];
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#else
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uint8_t *buf = malloc(V7FS_BSIZE);
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if (!fs->io.read(fs->io.cookie, buf, blk)) {
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DPRINTF("*** I/O error block %ld\n",(long)blk);
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free(buf);
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return NULL;
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}
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return buf;
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#endif
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}
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int
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scratch_remain(const struct v7fs_self *fs)
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{
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#ifdef STATIC_BUFFER
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int nfree;
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int i;
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MEM_LOCK(fs);
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for (i = 0, nfree = 0; i < V7FS_SELF_NSCRATCH; i++) {
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if (fs->scratch_free & (1 << i)) {
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nfree++;
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}
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}
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MEM_UNLOCK(fs);
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return nfree;
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#else
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return -1;
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#endif
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}
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void
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scratch_free(struct v7fs_self *fs __unused, void *p)
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{
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#ifdef STATIC_BUFFER
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int i;
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MEM_LOCK(fs);
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for (i = 0; i < V7FS_SELF_NSCRATCH; i++)
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if (fs->scratch[i] == p) {
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fs->scratch_free |= (1 << i);
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break;
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}
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MEM_UNLOCK(fs);
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assert(i != V7FS_SELF_NSCRATCH);
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#else
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free(p);
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#endif
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}
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