dosfsck.h

来自「linux dosfs 工具,可以移植到嵌入式系统下检查存储状态下的磁盘状况,修」· C头文件 代码 · 共 175 行

/* dosfsck.h  -  Common data structures and global variables */

/* Written 1993 by Werner Almesberger */

/* FAT32, VFAT, Atari format support, and various fixes additions May 1998
 * by Roman Hodek <[e-mail]> */


#ifndef _DOSFSCK_H
#define _DOSFSCK_H

#define __arm
#if __BYTE_ORDER == __BIG_ENDIAN

#include <asm/byteorder.h>
#ifdef __le16_to_cpu
/* ++roman: 2.1 kernel headers define these function, they're probably more
 * efficient then coding the swaps machine-independently. */
#define CF_LE_W	__le16_to_cpu
#define CF_LE_L	__le32_to_cpu
#define CT_LE_W	__cpu_to_le16
#define CT_LE_L	__cpu_to_le32
#else
#define CF_LE_W(v) ((((v) & 0xff) << 8) | (((v) >> 8) & 0xff))
#define CF_LE_L(v) (((unsigned)(v)>>24) | (((unsigned)(v)>>8)&0xff00) | \
               (((unsigned)(v)<<8)&0xff0000) | ((unsigned)(v)<<24))
#define CT_LE_W(v) CF_LE_W(v)
#define CT_LE_L(v) CF_LE_L(v)
#endif /* defined(__le16_to_cpu) */
    
#else

#define CF_LE_W(v) (v)
#define CF_LE_L(v) (v)
#define CT_LE_W(v) (v)
#define CT_LE_L(v) (v)

#endif /* __BIG_ENDIAN */

#include <sys/types.h>
#define _LINUX_STAT_H		/* hack to avoid inclusion of <linux/stat.h> */
#define _LINUX_STRING_H_	/* hack to avoid inclusion of <linux/string.h>*/
#define _LINUX_FS_H             /* hack to avoid inclusion of <linux/fs.h> */
#include <linux/msdos_fs.h>

/* 2.1 kernels use le16_to_cpu() type functions for CF_LE_W & Co., but don't
 * export this macros, only __le16_to_cpu(). */
#ifndef le16_to_cpu
#define le16_to_cpu	__le16_to_cpu
#define le32_to_cpu	__le32_to_cpu
#define cpu_to_le16	__cpu_to_le16
#define cpu_to_le32	__cpu_to_le32
#endif

#define VFAT_LN_ATTR (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)

/* ++roman: Use own definition of boot sector structure -- the kernel headers'
 * name for it is msdos_boot_sector in 2.0 and fat_boot_sector in 2.1 ... */
struct boot_sector {
    __u8	ignored[3];	/* Boot strap short or near jump */
    __u8	system_id[8];	/* Name - can be used to special case
				   partition manager volumes */
    __u8	sector_size[2];	/* bytes per logical sector */
    __u8	cluster_size;	/* sectors/cluster */
    __u16	reserved;	/* reserved sectors */
    __u8	fats;		/* number of FATs */
    __u8	dir_entries[2];	/* root directory entries */
    __u8	sectors[2];	/* number of sectors */
    __u8	media;		/* media code (unused) */
    __u16	fat_length;	/* sectors/FAT */
    __u16	secs_track;	/* sectors per track */
    __u16	heads;		/* number of heads */
    __u32	hidden;		/* hidden sectors (unused) */
    __u32	total_sect;	/* number of sectors (if sectors == 0) */
    
    /* The following fields are only used by FAT32 */
    __u32	fat32_length;	/* sectors/FAT */
    __u16	flags;		/* bit 8: fat mirroring, low 4: active fat */
    __u8	version[2];	/* major, minor filesystem version */
    __u32	root_cluster;	/* first cluster in root directory */
    __u16	info_sector;	/* filesystem info sector */
    __u16	backup_boot;	/* backup boot sector */
    __u16	reserved2[6];	/* Unused */

    /* fill up to 512 bytes */
    __u8	junk[448];
} __attribute__ ((packed));

struct info_sector {
    __u32	magic;		/* Magic for info sector ('RRaA') */
    __u8	junk[0x1dc];
    __u32	reserved1;	/* Nothing as far as I can tell */
    __u32	signature;	/* 0x61417272 ('rrAa') */
    __u32	free_clusters;	/* Free cluster count.  -1 if unknown */
    __u32	next_cluster;	/* Most recently allocated cluster. */
    __u32	reserved2[3];
    __u16	reserved3;
    __u16	boot_sign;
};

typedef struct {
    __s8	name[8],ext[3];	/* name and extension */
    __u8	attr;		/* attribute bits */
    __u8	lcase;		/* Case for base and extension */
    __u8	ctime_ms;	/* Creation time, milliseconds */
    __u16	ctime;		/* Creation time */
    __u16	cdate;		/* Creation date */
    __u16	adate;		/* Last access date */
    __u16	starthi;	/* High 16 bits of cluster in FAT32 */
    __u16	time,date,start;/* time, date and first cluster */
    __u32	size;		/* file size (in bytes) */
} DIR_ENT;

typedef struct _dos_file {
    DIR_ENT dir_ent;
    char *lfn;
    loff_t offset;
    struct _dos_file *parent; /* parent directory */
    struct _dos_file *next; /* next entry */
    struct _dos_file *first; /* first entry (directory only) */
} DOS_FILE;

typedef struct {
    unsigned long value;
    unsigned long reserved;
    DOS_FILE *owner;
    int prev; /* number of previous clusters */
} FAT_ENTRY;

typedef struct {
    int nfats;
    loff_t fat_start;
    unsigned int fat_size; /* unit is bytes */
    unsigned int fat_bits; /* size of a FAT entry */
    unsigned int eff_fat_bits; /* # of used bits in a FAT entry */
    unsigned long root_cluster; /* 0 for old-style root dir */
    loff_t root_start;
    unsigned int root_entries;
    loff_t data_start;
    unsigned int cluster_size;
    unsigned long clusters;
    loff_t fsinfo_start; /* 0 if not present */
    long free_clusters;
    loff_t backupboot_start; /* 0 if not present */
    FAT_ENTRY *fat;
} DOS_FS;

#ifndef offsetof
#define offsetof(t,e)	((int)&(((t *)0)->e))
#endif

extern int interactive,list,verbose,test,write_immed;
extern int atari_format;
extern unsigned n_files;
extern void *mem_queue;

/* value to use as end-of-file marker */
#define FAT_EOF(fs)	((atari_format ? 0xfff : 0xff8) | FAT_EXTD(fs))
#define FAT_IS_EOF(fs,v) ((unsigned long)(v) >= (0xff8|FAT_EXTD(fs)))
/* value to mark bad clusters */
#define FAT_BAD(fs)	(0xff7 | FAT_EXTD(fs))
/* range of values used for bad clusters */
#define FAT_MIN_BAD(fs)	((atari_format ? 0xff0 : 0xff7) | FAT_EXTD(fs))
#define FAT_MAX_BAD(fs)	((atari_format ? 0xff7 : 0xff7) | FAT_EXTD(fs))
#define FAT_IS_BAD(fs,v) ((v) >= FAT_MIN_BAD(fs) && (v) <= FAT_MAX_BAD(fs))

/* return -16 as a number with fs->fat_bits bits */
#define FAT_EXTD(fs)	(((1 << fs->eff_fat_bits)-1) & ~0xf)

#endif

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