1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 */ 28 29 #ifndef EXT_H 30 #define EXT_H 31 32 #include <sys/types.h> 33 34 #include <stdbool.h> 35 36 #include "dosfs.h" 37 38 #define LOSTDIR "LOST.DIR" 39 40 /* 41 * Options: 42 */ 43 extern int alwaysno; /* assume "no" for all questions */ 44 extern int alwaysyes; /* assume "yes" for all questions */ 45 extern int preen; /* we are preening */ 46 extern int rdonly; /* device is opened read only (supersedes above) */ 47 extern int skipclean; /* skip clean file systems if preening */ 48 extern int allow_mmap; /* allow the use of mmap() */ 49 50 /* 51 * function declarations 52 */ 53 int ask(int, const char *, ...) __printflike(2, 3); 54 55 /* 56 * Check the dirty flag. If the file system is clean, then return 1. 57 * Otherwise, return 0 (this includes the case of FAT12 file systems -- 58 * they have no dirty flag, so they must be assumed to be unclean). 59 */ 60 int checkdirty(int, struct bootblock *); 61 62 /* 63 * Check file system given as arg 64 */ 65 int checkfilesys(const char *); 66 67 /* 68 * Return values of various functions 69 */ 70 #define FSOK 0 /* Check was OK */ 71 #define FSBOOTMOD 1 /* Boot block was modified */ 72 #define FSDIRMOD 2 /* Some directory was modified */ 73 #define FSFATMOD 4 /* The FAT was modified */ 74 #define FSERROR 8 /* Some unrecovered error remains */ 75 #define FSFATAL 16 /* Some unrecoverable error occurred */ 76 #define FSDIRTY 32 /* File system is dirty */ 77 78 /* 79 * read a boot block in a machine independent fashion and translate 80 * it into our struct bootblock. 81 */ 82 int readboot(int, struct bootblock *); 83 84 /* 85 * Correct the FSInfo block. 86 */ 87 int writefsinfo(int, struct bootblock *); 88 89 /* Opaque type */ 90 struct fat_descriptor; 91 92 int cleardirty(struct fat_descriptor *); 93 94 void fat_clear_cl_head(struct fat_descriptor *, cl_t); 95 bool fat_is_cl_head(struct fat_descriptor *, cl_t); 96 97 cl_t fat_get_cl_next(struct fat_descriptor *, cl_t); 98 99 int fat_set_cl_next(struct fat_descriptor *, cl_t, cl_t); 100 101 cl_t fat_allocate_cluster(struct fat_descriptor *fat); 102 103 struct bootblock* fat_get_boot(struct fat_descriptor *); 104 int fat_get_fd(struct fat_descriptor *); 105 bool fat_is_valid_cl(struct fat_descriptor *, cl_t); 106 107 /* 108 * Read the FAT 0 and return a pointer to the newly allocated 109 * descriptor of it. 110 */ 111 int readfat(int, struct bootblock *, struct fat_descriptor **); 112 113 /* 114 * Write back FAT entries 115 */ 116 int writefat(struct fat_descriptor *); 117 118 /* 119 * Read a directory 120 */ 121 int resetDosDirSection(struct fat_descriptor *); 122 void finishDosDirSection(void); 123 int handleDirTree(struct fat_descriptor *); 124 125 /* 126 * Cross-check routines run after everything is completely in memory 127 */ 128 int checkchain(struct fat_descriptor *, cl_t, size_t *); 129 130 /* 131 * Check for lost cluster chains 132 */ 133 int checklost(struct fat_descriptor *); 134 /* 135 * Try to reconnect a lost cluster chain 136 */ 137 int reconnect(struct fat_descriptor *, cl_t, size_t); 138 void finishlf(void); 139 140 /* 141 * Small helper functions 142 */ 143 /* 144 * Return the type of a reserved cluster as text 145 */ 146 const char *rsrvdcltype(cl_t); 147 148 /* 149 * Clear a cluster chain in a FAT 150 */ 151 void clearchain(struct fat_descriptor *, cl_t); 152 153 #endif 154