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1 /* dosfsck.h  -  Common data structures and global variables
2 
3    Copyright (C) 1993 Werner Almesberger <werner.almesberger@lrc.di.epfl.ch>
4    Copyright (C) 1998 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
5 
6    This program is free software: you can redistribute it and/or modify
7    it under the terms of the GNU General Public License as published by
8    the Free Software Foundation, either version 3 of the License, or
9    (at your option) any later version.
10 
11    This program is distributed in the hope that it will be useful,
12    but WITHOUT ANY WARRANTY; without even the implied warranty of
13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14    GNU General Public License for more details.
15 
16    You should have received a copy of the GNU General Public License
17    along with this program. If not, see <http://www.gnu.org/licenses/>.
18 
19    On Debian systems, the complete text of the GNU General Public License
20    can be found in /usr/share/common-licenses/GPL-3 file.
21 */
22 
23 /* FAT32, VFAT, Atari format support, and various fixes additions May 1998
24  * by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> */
25 
26 
27 #ifndef _DOSFSCK_H
28 #define _DOSFSCK_H
29 
30 #include <sys/types.h>
31 #define _LINUX_STAT_H		/* hack to avoid inclusion of <linux/stat.h> */
32 #define _LINUX_STRING_H_	/* hack to avoid inclusion of <linux/string.h>*/
33 #define _LINUX_FS_H             /* hack to avoid inclusion of <linux/fs.h> */
34 
35 # include <asm/types.h>
36 # include <asm/byteorder.h>
37 
38 #include <linux/msdos_fs.h>
39 
40 #undef CF_LE_W
41 #undef CF_LE_L
42 #undef CT_LE_W
43 #undef CT_LE_L
44 
45 #if defined __arm__
46 	#undef __BYTE_ORDER
47 	#define __BYTE_ORDER __LITTLE_ENDIAN
48 #endif
49 
50 #if __BYTE_ORDER == __BIG_ENDIAN
51 #include <byteswap.h>
52 #define CF_LE_W(v) bswap_16(v)
53 #define CF_LE_L(v) bswap_32(v)
54 #define CT_LE_W(v) CF_LE_W(v)
55 #define CT_LE_L(v) CF_LE_L(v)
56 #else
57 #define CF_LE_W(v) (v)
58 #define CF_LE_L(v) (v)
59 #define CT_LE_W(v) (v)
60 #define CT_LE_L(v) (v)
61 #endif /* __BIG_ENDIAN */
62 
63 #define VFAT_LN_ATTR (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
64 
65 /* ++roman: Use own definition of boot sector structure -- the kernel headers'
66  * name for it is msdos_boot_sector in 2.0 and fat_boot_sector in 2.1 ... */
67 struct boot_sector {
68     __u8	ignored[3];	/* Boot strap short or near jump */
69     __u8	system_id[8];	/* Name - can be used to special case
70 				   partition manager volumes */
71     __u8	sector_size[2];	/* bytes per logical sector */
72     __u8	cluster_size;	/* sectors/cluster */
73     __u16	reserved;	/* reserved sectors */
74     __u8	fats;		/* number of FATs */
75     __u8	dir_entries[2];	/* root directory entries */
76     __u8	sectors[2];	/* number of sectors */
77     __u8	media;		/* media code (unused) */
78     __u16	fat_length;	/* sectors/FAT */
79     __u16	secs_track;	/* sectors per track */
80     __u16	heads;		/* number of heads */
81     __u32	hidden;		/* hidden sectors (unused) */
82     __u32	total_sect;	/* number of sectors (if sectors == 0) */
83 
84     /* The following fields are only used by FAT32 */
85     __u32	fat32_length;	/* sectors/FAT */
86     __u16	flags;		/* bit 8: fat mirroring, low 4: active fat */
87     __u8	version[2];	/* major, minor filesystem version */
88     __u32	root_cluster;	/* first cluster in root directory */
89     __u16	info_sector;	/* filesystem info sector */
90     __u16	backup_boot;	/* backup boot sector */
91     __u8 	reserved2[12];	/* Unused */
92 
93     __u8        drive_number;   /* Logical Drive Number */
94     __u8        reserved3;      /* Unused */
95 
96     __u8        extended_sig;   /* Extended Signature (0x29) */
97     __u32       serial;         /* Serial number */
98     __u8        label[11];      /* FS label */
99     __u8        fs_type[8];     /* FS Type */
100 
101     /* fill up to 512 bytes */
102     __u8	junk[422];
103 } __attribute__ ((packed));
104 
105 struct boot_sector_16 {
106     __u8	ignored[3];	/* Boot strap short or near jump */
107     __u8	system_id[8];	/* Name - can be used to special case
108 				   partition manager volumes */
109     __u8	sector_size[2];	/* bytes per logical sector */
110     __u8	cluster_size;	/* sectors/cluster */
111     __u16	reserved;	/* reserved sectors */
112     __u8	fats;		/* number of FATs */
113     __u8	dir_entries[2];	/* root directory entries */
114     __u8	sectors[2];	/* number of sectors */
115     __u8	media;		/* media code (unused) */
116     __u16	fat_length;	/* sectors/FAT */
117     __u16	secs_track;	/* sectors per track */
118     __u16	heads;		/* number of heads */
119     __u32	hidden;		/* hidden sectors (unused) */
120     __u32	total_sect;	/* number of sectors (if sectors == 0) */
121 
122     __u8        drive_number;   /* Logical Drive Number */
123     __u8        reserved2;      /* Unused */
124 
125     __u8        extended_sig;   /* Extended Signature (0x29) */
126     __u32       serial;         /* Serial number */
127     __u8        label[11];      /* FS label */
128     __u8        fs_type[8];     /* FS Type */
129 
130     /* fill up to 512 bytes */
131     __u8	junk[450];
132 } __attribute__ ((packed));
133 
134 struct info_sector {
135     __u32	magic;		/* Magic for info sector ('RRaA') */
136     __u8	junk[0x1dc];
137     __u32	reserved1;	/* Nothing as far as I can tell */
138     __u32	signature;	/* 0x61417272 ('rrAa') */
139     __u32	free_clusters;	/* Free cluster count.  -1 if unknown */
140     __u32	next_cluster;	/* Most recently allocated cluster. */
141     __u32	reserved2[3];
142     __u16	reserved3;
143     __u16	boot_sign;
144 };
145 
146 typedef struct {
147     __u8	name[8],ext[3];	/* name and extension */
148     __u8	attr;		/* attribute bits */
149     __u8	lcase;		/* Case for base and extension */
150     __u8	ctime_ms;	/* Creation time, milliseconds */
151     __u16	ctime;		/* Creation time */
152     __u16	cdate;		/* Creation date */
153     __u16	adate;		/* Last access date */
154     __u16	starthi;	/* High 16 bits of cluster in FAT32 */
155     __u16	time,date,start;/* time, date and first cluster */
156     __u32	size;		/* file size (in bytes) */
157 } DIR_ENT;
158 
159 typedef struct _dos_file {
160     DIR_ENT dir_ent;
161     char *lfn;
162     loff_t offset;
163     struct _dos_file *parent; /* parent directory */
164     struct _dos_file *next; /* next entry */
165     struct _dos_file *first; /* first entry (directory only) */
166 } DOS_FILE;
167 
168 typedef struct {
169     unsigned long value;
170     unsigned long reserved;
171     DOS_FILE *owner;
172     int prev; /* number of previous clusters */
173 } FAT_ENTRY;
174 
175 typedef struct {
176     int nfats;
177     loff_t fat_start;
178     unsigned int fat_size; /* unit is bytes */
179     unsigned int fat_bits; /* size of a FAT entry */
180     unsigned int eff_fat_bits; /* # of used bits in a FAT entry */
181     unsigned long root_cluster; /* 0 for old-style root dir */
182     loff_t root_start;
183     unsigned int root_entries;
184     loff_t data_start;
185     unsigned int cluster_size;
186     unsigned long clusters;
187     loff_t fsinfo_start; /* 0 if not present */
188     long free_clusters;
189     loff_t backupboot_start; /* 0 if not present */
190     FAT_ENTRY *fat;
191     char *label;
192 } DOS_FS;
193 
194 #ifndef offsetof
195 #define offsetof(t,e)	((int)&(((t *)0)->e))
196 #endif
197 
198 extern int interactive,list,verbose,test,write_immed;
199 extern int atari_format;
200 extern unsigned n_files;
201 extern void *mem_queue;
202 
203 /* value to use as end-of-file marker */
204 #define FAT_EOF(fs)	((atari_format ? 0xfff : 0xff8) | FAT_EXTD(fs))
205 #define FAT_IS_EOF(fs,v) ((unsigned long)(v) >= (0xff8|FAT_EXTD(fs)))
206 /* value to mark bad clusters */
207 #define FAT_BAD(fs)	(0xff7 | FAT_EXTD(fs))
208 /* range of values used for bad clusters */
209 #define FAT_MIN_BAD(fs)	((atari_format ? 0xff0 : 0xff7) | FAT_EXTD(fs))
210 #define FAT_MAX_BAD(fs)	((atari_format ? 0xff7 : 0xff7) | FAT_EXTD(fs))
211 #define FAT_IS_BAD(fs,v) ((v) >= FAT_MIN_BAD(fs) && (v) <= FAT_MAX_BAD(fs))
212 
213 /* return -16 as a number with fs->fat_bits bits */
214 #define FAT_EXTD(fs)	(((1 << fs->eff_fat_bits)-1) & ~0xf)
215 
216 #endif
217 
218 /* Local Variables: */
219 /* tab-width: 8     */
220 /* End:             */
221