/* $NetBSD: v7fs_io.c,v 1.3 2013/06/28 14:49:14 christos Exp $ */ /*- * Copyright (c) 2011 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by UCHIYAMA Yasushi. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #if HAVE_NBTOOL_CONFIG_H #include "nbtool_config.h" #endif #include __KERNEL_RCSID(0, "$NetBSD: v7fs_io.c,v 1.3 2013/06/28 14:49:14 christos Exp $"); #if defined _KERNEL_OPT #include "opt_v7fs.h" #endif #ifdef _KERNEL #include #else #include #include #include #endif #include "v7fs.h" #include "v7fs_impl.h" #if defined _KERNEL #define STATIC_BUFFER #endif #ifdef V7FS_IO_DEBUG #define DPRINTF(fmt, args...) printf("%s: " fmt, __func__, ##args) #else #define DPRINTF(fmt, args...) ((void)0) #endif void * scratch_read(struct v7fs_self *fs, daddr_t blk) { #ifdef STATIC_BUFFER int i; MEM_LOCK(fs); for (i = 0; i < V7FS_SELF_NSCRATCH; i++) { if (fs->scratch_free & (1 << i)) { fs->scratch_free &= ~(1 << i); break; } } if (i == V7FS_SELF_NSCRATCH) { DPRINTF("No scratch area. increase V7FS_SELF_NSCRATCH\n"); assert(0); MEM_UNLOCK(fs); return NULL; } if (!fs->io.read(fs->io.cookie, fs->scratch[i], blk)) { DPRINTF("*** I/O error block %ld\n", (long)blk); fs->scratch_free |= (1 << i); MEM_UNLOCK(fs); return NULL; } MEM_UNLOCK(fs); /* Statistic */ int n; if ((n = scratch_remain(fs)) < fs->scratch_remain) fs->scratch_remain = n; return fs->scratch[i]; #else uint8_t *buf = malloc(V7FS_BSIZE); if (!fs->io.read(fs->io.cookie, buf, blk)) { DPRINTF("*** I/O error block %ld\n",(long)blk); free(buf); return NULL; } return buf; #endif } int scratch_remain(const struct v7fs_self *fs) { #ifdef STATIC_BUFFER int nfree; int i; MEM_LOCK(fs); for (i = 0, nfree = 0; i < V7FS_SELF_NSCRATCH; i++) { if (fs->scratch_free & (1 << i)) { nfree++; } } MEM_UNLOCK(fs); return nfree; #else return -1; #endif } void scratch_free(struct v7fs_self *fs __unused, void *p) { #ifdef STATIC_BUFFER int i; MEM_LOCK(fs); for (i = 0; i < V7FS_SELF_NSCRATCH; i++) if (fs->scratch[i] == p) { fs->scratch_free |= (1 << i); break; } MEM_UNLOCK(fs); assert(i != V7FS_SELF_NSCRATCH); #else free(p); #endif }