2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
5 * Copyright (c) 1995 Martin Husemann
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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 $
33 #include <sys/types.h>
39 #define LOSTDIR "LOST.DIR"
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() */
52 * function declarations
54 int ask(int, const char *, ...) __printflike(2, 3);
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).
61 int checkdirty(int, struct bootblock *);
64 * Check file system given as arg
66 int checkfilesys(const char *);
69 * Return values of various functions
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 */
80 * read a boot block in a machine independent fashion and translate
81 * it into our struct bootblock.
83 int readboot(int, struct bootblock *);
86 * Correct the FSInfo block.
88 int writefsinfo(int, struct bootblock *);
91 struct fat_descriptor;
93 int cleardirty(struct fat_descriptor *);
95 void fat_clear_cl_head(struct fat_descriptor *, cl_t);
96 bool fat_is_cl_head(struct fat_descriptor *, cl_t);
98 cl_t fat_get_cl_next(struct fat_descriptor *, cl_t);
100 int fat_set_cl_next(struct fat_descriptor *, cl_t, cl_t);
102 cl_t fat_allocate_cluster(struct fat_descriptor *fat);
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);
109 * Read the FAT 0 and return a pointer to the newly allocated
112 int readfat(int, struct bootblock *, struct fat_descriptor **);
115 * Write back FAT entries
117 int writefat(struct fat_descriptor *);
122 int resetDosDirSection(struct fat_descriptor *);
123 void finishDosDirSection(void);
124 int handleDirTree(struct fat_descriptor *);
127 * Cross-check routines run after everything is completely in memory
129 int checkchain(struct fat_descriptor *, cl_t, size_t *);
132 * Check for lost cluster chains
134 int checklost(struct fat_descriptor *);
136 * Try to reconnect a lost cluster chain
138 int reconnect(struct fat_descriptor *, cl_t, size_t);
142 * Small helper functions
145 * Return the type of a reserved cluster as text
147 const char *rsrvdcltype(cl_t);
150 * Clear a cluster chain in a FAT
152 void clearchain(struct fat_descriptor *, cl_t);