1/* dosfsck.h  -  Common data structures and global variables */
2
3/* Written 1993 by Werner Almesberger */
4
5/* FAT32, VFAT, Atari format support, and various fixes additions May 1998
6 * by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de> */
7
8
9#ifndef _DOSFSCK_H
10#define _DOSFSCK_H
11
12#include <sys/types.h>
13#define _LINUX_STAT_H		/* hack to avoid inclusion of <linux/stat.h> */
14#define _LINUX_STRING_H_	/* hack to avoid inclusion of <linux/string.h>*/
15#include <linux/msdos_fs.h>
16
17/* 2.1 kernels use le16_to_cpu() type functions for CF_LE_W & Co., but don't
18 * export this macros, only __le16_to_cpu(). */
19#ifndef le16_to_cpu
20#define le16_to_cpu	__le16_to_cpu
21#define le32_to_cpu	__le32_to_cpu
22#define cpu_to_le16	__cpu_to_le16
23#define cpu_to_le32	__cpu_to_le32
24#endif
25
26#define VFAT_LN_ATTR (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
27
28/* ++roman: Use own definition of boot sector structure -- the kernel headers'
29 * name for it is msdos_boot_sector in 2.0 and fat_boot_sector in 2.1 ... */
30struct boot_sector {
31    __u8	ignored[3];	/* Boot strap short or near jump */
32    __u8	system_id[8];	/* Name - can be used to special case
33				   partition manager volumes */
34    __u8	sector_size[2];	/* bytes per logical sector */
35    __u8	cluster_size;	/* sectors/cluster */
36    __u16	reserved;	/* reserved sectors */
37    __u8	fats;		/* number of FATs */
38    __u8	dir_entries[2];	/* root directory entries */
39    __u8	sectors[2];	/* number of sectors */
40    __u8	media;		/* media code (unused) */
41    __u16	fat_length;	/* sectors/FAT */
42    __u16	secs_track;	/* sectors per track */
43    __u16	heads;		/* number of heads */
44    __u32	hidden;		/* hidden sectors (unused) */
45    __u32	total_sect;	/* number of sectors (if sectors == 0) */
46
47    /* The following fields are only used by FAT32 */
48    __u32	fat32_length;	/* sectors/FAT */
49    __u16	flags;		/* bit 8: fat mirroring, low 4: active fat */
50    __u8	version[2];	/* major, minor filesystem version */
51    __u32	root_cluster;	/* first cluster in root directory */
52    __u16	info_sector;	/* filesystem info sector */
53    __u16	backup_boot;	/* backup boot sector */
54    __u16	reserved2[6];	/* Unused */
55
56    /* fill up to 512 bytes */
57    __u8	junk[448];
58} __attribute__ ((packed));
59
60struct info_sector {
61    __u32	magic;		/* Magic for info sector ('RRaA') */
62    __u8	junk[0x1dc];
63    __u32	reserved1;	/* Nothing as far as I can tell */
64    __u32	signature;	/* 0x61417272 ('rrAa') */
65    __u32	free_clusters;	/* Free cluster count.  -1 if unknown */
66    __u32	next_cluster;	/* Most recently allocated cluster. */
67    __u32	reserved2[3];
68    __u16	reserved3;
69    __u16	boot_sign;
70};
71
72typedef struct {
73    __s8	name[8],ext[3];	/* name and extension */
74    __u8	attr;		/* attribute bits */
75    __u8	lcase;		/* Case for base and extension */
76    __u8	ctime_ms;	/* Creation time, milliseconds */
77    __u16	ctime;		/* Creation time */
78    __u16	cdate;		/* Creation date */
79    __u16	adate;		/* Last access date */
80    __u16	starthi;	/* High 16 bits of cluster in FAT32 */
81    __u16	time,date,start;/* time, date and first cluster */
82    __u32	size;		/* file size (in bytes) */
83} DIR_ENT;
84
85typedef struct _dos_file {
86    DIR_ENT dir_ent;
87    char *lfn;
88    loff_t offset;
89    struct _dos_file *parent; /* parent directory */
90    struct _dos_file *next; /* next entry */
91    struct _dos_file *first; /* first entry (directory only) */
92} DOS_FILE;
93
94typedef struct {
95    unsigned long value;
96    unsigned long reserved;
97    DOS_FILE *owner;
98    int prev; /* number of previous clusters */
99} FAT_ENTRY;
100
101typedef struct {
102    loff_t fat_start;
103    unsigned int fat_size; /* unit is bytes */
104    unsigned int fat_bits; /* size of a FAT entry */
105    unsigned int eff_fat_bits; /* # of used bits in a FAT entry */
106    unsigned long root_cluster; /* 0 for old-style root dir */
107    loff_t root_start;
108    unsigned int root_entries;
109    loff_t data_start;
110    unsigned int cluster_size;
111    unsigned long clusters;
112    loff_t fsinfo_start; /* 0 if not present */
113    long free_clusters;
114    loff_t backupboot_start; /* 0 if not present */
115    unsigned char volume_id[4];
116    FAT_ENTRY *fat;
117} DOS_FS;
118
119#ifndef offsetof
120#define offsetof(t,e)	((int)&(((t *)0)->e))
121#endif
122
123extern int interactive,list,verbose,test,write_immed;
124extern int atari_format;
125extern unsigned n_files;
126extern void *mem_queue;
127
128/* value to use as end-of-file marker */
129#define FAT_EOF(fs)	((atari_format ? 0xfff : 0xff8) | FAT_EXTD(fs))
130#define FAT_IS_EOF(fs,v) ((unsigned long)(v) >= (0xff8|FAT_EXTD(fs)))
131/* value to mark bad clusters */
132#define FAT_BAD(fs)	(0xff7 | FAT_EXTD(fs))
133/* range of values used for bad clusters */
134#define FAT_MIN_BAD(fs)	((atari_format ? 0xff0 : 0xff7) | FAT_EXTD(fs))
135#define FAT_MAX_BAD(fs)	((atari_format ? 0xff7 : 0xff7) | FAT_EXTD(fs))
136#define FAT_IS_BAD(fs,v) ((v) >= FAT_MIN_BAD(fs) && (v) <= FAT_MAX_BAD(fs))
137
138/* return -16 as a number with fs->fat_bits bits */
139#define FAT_EXTD(fs)	(((1 << fs->eff_fat_bits)-1) & ~0xf)
140
141#endif
142
143/* Local Variables: */
144/* tab-width: 8     */
145/* End:             */
146