1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank 5 * Copyright (c) 1995 Martin Husemann 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * $NetBSD: ext.h,v 1.6 2000/04/25 23:02:51 jdolecek Exp $ 27 * $FreeBSD$ 28 */ 29 30 #ifndef EXT_H 31 #define EXT_H 32 33 #include <sys/types.h> 34 35 #include <stdbool.h> 36 37 #include "dosfs.h" 38 39 #define LOSTDIR "LOST.DIR" 40 41 /* 42 * Options: 43 */ 44 extern int alwaysno; /* assume "no" for all questions */ 45 extern int alwaysyes; /* assume "yes" for all questions */ 46 extern int preen; /* we are preening */ 47 extern int rdonly; /* device is opened read only (supersedes above) */ 48 extern int skipclean; /* skip clean file systems if preening */ 49 extern int allow_mmap; /* allow the use of mmap() */ 50 51 /* 52 * function declarations 53 */ 54 int ask(int, const char *, ...) __printflike(2, 3); 55 56 /* 57 * Check the dirty flag. If the file system is clean, then return 1. 58 * Otherwise, return 0 (this includes the case of FAT12 file systems -- 59 * they have no dirty flag, so they must be assumed to be unclean). 60 */ 61 int checkdirty(int, struct bootblock *); 62 63 /* 64 * Check file system given as arg 65 */ 66 int checkfilesys(const char *); 67 68 /* 69 * Return values of various functions 70 */ 71 #define FSOK 0 /* Check was OK */ 72 #define FSBOOTMOD 1 /* Boot block was modified */ 73 #define FSDIRMOD 2 /* Some directory was modified */ 74 #define FSFATMOD 4 /* The FAT was modified */ 75 #define FSERROR 8 /* Some unrecovered error remains */ 76 #define FSFATAL 16 /* Some unrecoverable error occurred */ 77 #define FSDIRTY 32 /* File system is dirty */ 78 79 /* 80 * read a boot block in a machine independent fashion and translate 81 * it into our struct bootblock. 82 */ 83 int readboot(int, struct bootblock *); 84 85 /* 86 * Correct the FSInfo block. 87 */ 88 int writefsinfo(int, struct bootblock *); 89 90 /* Opaque type */ 91 struct fat_descriptor; 92 93 int cleardirty(struct fat_descriptor *); 94 95 void fat_clear_cl_head(struct fat_descriptor *, cl_t); 96 bool fat_is_cl_head(struct fat_descriptor *, cl_t); 97 98 cl_t fat_get_cl_next(struct fat_descriptor *, cl_t); 99 100 int fat_set_cl_next(struct fat_descriptor *, cl_t, cl_t); 101 102 cl_t fat_allocate_cluster(struct fat_descriptor *fat); 103 104 struct bootblock* fat_get_boot(struct fat_descriptor *); 105 int fat_get_fd(struct fat_descriptor *); 106 bool fat_is_valid_cl(struct fat_descriptor *, cl_t); 107 108 /* 109 * Read the FAT 0 and return a pointer to the newly allocated 110 * descriptor of it. 111 */ 112 int readfat(int, struct bootblock *, struct fat_descriptor **); 113 114 /* 115 * Write back FAT entries 116 */ 117 int writefat(struct fat_descriptor *); 118 119 /* 120 * Read a directory 121 */ 122 int resetDosDirSection(struct fat_descriptor *); 123 void finishDosDirSection(void); 124 int handleDirTree(struct fat_descriptor *); 125 126 /* 127 * Cross-check routines run after everything is completely in memory 128 */ 129 int checkchain(struct fat_descriptor *, cl_t, size_t *); 130 131 /* 132 * Check for lost cluster chains 133 */ 134 int checklost(struct fat_descriptor *); 135 /* 136 * Try to reconnect a lost cluster chain 137 */ 138 int reconnect(struct fat_descriptor *, cl_t, size_t); 139 void finishlf(void); 140 141 /* 142 * Small helper functions 143 */ 144 /* 145 * Return the type of a reserved cluster as text 146 */ 147 const char *rsrvdcltype(cl_t); 148 149 /* 150 * Clear a cluster chain in a FAT 151 */ 152 void clearchain(struct fat_descriptor *, cl_t); 153 154 #endif 155