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< title > FatFs - FATFS< / title >
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< h2 > FATFS< / h2 >
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< p > The < tt > FATFS< / tt > structure (file system object) holds dynamic work area of individual logical drives. It is given by application program and registerd/unregisterd to the FatFs module with < tt > f_mount< / tt > function. Initialization of the structure is done by volume mount process whenever necessary. Application program must not modify any member in this structure, or the FAT volume can be collapsed.< / p >
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< pre >
< span class = "k" > typedef< / span > < span class = "k" > struct< / span > {
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BYTE fs_type; < span class = "c" > /* File system type (0, FS_FAT12, FS_FAT16, FS_FAT32 or FS_EXFAT) */< / span >
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BYTE drv; < span class = "c" > /* Physical drive number */< / span >
BYTE n_fats; < span class = "c" > /* Number of FAT copies (1,2) */< / span >
BYTE wflag; < span class = "c" > /* win[] flag (b0:win[] is dirty) */< / span >
BYTE fsi_flag; < span class = "c" > /* FSINFO flags (b7:Disabled, b0:Dirty) */< / span >
WORD id; < span class = "c" > /* File system mount ID */< / span >
WORD n_rootdir; < span class = "c" > /* Number of root directory entries (FAT12/16) */< / span >
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WORD csize; < span class = "c" > /* Sectors per cluster */< / span >
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< span class = "k" > #if< / span > _MAX_SS != _MIN_SS
WORD ssize; < span class = "c" > /* Sector size (512,1024,2048 or 4096) */< / span >
< span class = "k" > #endif< / span >
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< span class = "k" > #if _FS_EXFAT< / span >
BYTE* dirbuf; < span class = "c" > /* Directory entry block scratchpad buffer */< / span >
< span class = "k" > #endif< / span >
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< span class = "k" > #if< / span > _FS_REENTRANT
_SYNC_t sobj; < span class = "c" > /* Identifier of sync object */< / span >
< span class = "k" > #endif< / span >
< span class = "k" > #if< / span > !_FS_READONLY
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DWORD last_clust; < span class = "c" > /* FSINFO: Last allocated cluster (0xFFFFFFFF if invalid) */< / span >
DWORD free_clust; < span class = "c" > /* FSINFO: Number of free clusters (0xFFFFFFFF if invalid) */< / span >
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< span class = "k" > #endif< / span >
< span class = "k" > #if< / span > _FS_RPATH
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DWORD cdir; < span class = "c" > /* Cluster number of current directory (0:root) */< / span >
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< span class = "k" > #if _FS_EXFAT< / span >
DWORD cdc_scl; < span class = "c" > /* Containing directory start cluster (invalid when cdir is 0) */< / span >
DWORD cdc_size; < span class = "c" > /* b31-b8:Size of containing directory, b7-b0: Chain status */< / span >
DWORD cdc_ofs; < span class = "c" > /* Offset in the containing directory (invalid when cdir is 0) */< / span >
< span class = "k" > #endif< / span >
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< span class = "k" > #endif< / span >
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DWORD n_fatent; < span class = "c" > /* Number of FAT entries (Number of clusters + 2) */< / span >
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DWORD fsize; < span class = "c" > /* Sectors per FAT */< / span >
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DWORD volbase; < span class = "c" > /* Volume base LBA */< / span >
DWORD fatbase; < span class = "c" > /* FAT base LBA */< / span >
DWORD dirbase; < span class = "c" > /* Root directory base (LBA|Cluster) */< / span >
DWORD database; < span class = "c" > /* Data base LBA */< / span >
DWORD winsect; < span class = "c" > /* Sector LBA appearing in the win[] */< / span >
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BYTE win[_MAX_SS]; < span class = "c" > /* Disk access window for directory, FAT (and file data at tiny cfg) */< / span >
} FATFS;
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