1 /* $NetBSD: v7fs_io.c,v 1.2 2011/07/18 21:51:49 apb Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by UCHIYAMA Yasushi. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #if HAVE_NBTOOL_CONFIG_H 33 #include "nbtool_config.h" 34 #endif 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: v7fs_io.c,v 1.2 2011/07/18 21:51:49 apb Exp $"); 38 #if defined _KERNEL_OPT 39 #include "opt_v7fs.h" 40 #endif 41 42 #ifdef _KERNEL 43 #include <sys/param.h> 44 #else 45 #include <stdio.h> 46 #include <errno.h> 47 #include <stdlib.h> 48 #endif 49 50 #include "v7fs.h" 51 #include "v7fs_impl.h" 52 53 #if defined _KERNEL 54 #define STATIC_BUFFER 55 #endif 56 57 #ifdef V7FS_IO_DEBUG 58 #define DPRINTF(fmt, args...) printf("%s: " fmt, __func__, ##args) 59 #else 60 #define DPRINTF(fmt, args...) ((void)0) 61 #endif 62 63 void * 64 scratch_read(struct v7fs_self *fs, daddr_t blk) 65 { 66 #ifdef STATIC_BUFFER 67 int i; 68 MEM_LOCK(fs); 69 for (i = 0; i < V7FS_SELF_NSCRATCH; i++) { 70 if (fs->scratch_free & (1 << i)) { 71 fs->scratch_free &= ~(1 << i); 72 break; 73 } 74 } 75 if (i == V7FS_SELF_NSCRATCH) { 76 DPRINTF("No scratch area. increase V7FS_SELF_NSCRATCH\n"); 77 assert(0); 78 MEM_UNLOCK(fs); 79 return NULL; 80 } 81 82 if (!fs->io.read(fs->io.cookie, fs->scratch[i], blk)) { 83 DPRINTF("*** I/O error block %ld\n", (long)blk); 84 fs->scratch_free |= (1 << i); 85 MEM_UNLOCK(fs); 86 return NULL; 87 } 88 MEM_UNLOCK(fs); 89 /* Statistic */ 90 int n; 91 if ((n = scratch_remain(fs)) < fs->scratch_remain) 92 fs->scratch_remain = n; 93 94 return fs->scratch[i]; 95 #else 96 uint8_t *buf = malloc(V7FS_BSIZE); 97 if (!fs->io.read(fs->io.cookie, buf, blk)) { 98 DPRINTF("*** I/O error block %ld\n",(long)blk); 99 return NULL; 100 } 101 return buf; 102 #endif 103 } 104 105 int 106 scratch_remain(const struct v7fs_self *fs) 107 { 108 #ifdef STATIC_BUFFER 109 int nfree; 110 int i; 111 MEM_LOCK(fs); 112 for (i = 0, nfree = 0; i < V7FS_SELF_NSCRATCH; i++) { 113 if (fs->scratch_free & (1 << i)) { 114 nfree++; 115 } 116 } 117 MEM_UNLOCK(fs); 118 return nfree; 119 #else 120 return -1; 121 #endif 122 } 123 124 void 125 scratch_free(struct v7fs_self *fs __unused, void *p) 126 { 127 #ifdef STATIC_BUFFER 128 int i; 129 MEM_LOCK(fs); 130 for (i = 0; i < V7FS_SELF_NSCRATCH; i++) 131 if (fs->scratch[i] == p) { 132 fs->scratch_free |= (1 << i); 133 break; 134 } 135 MEM_UNLOCK(fs); 136 assert(i != V7FS_SELF_NSCRATCH); 137 #else 138 free(p); 139 #endif 140 } 141