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    uint8_t     mdesc;      /**< Media descriptor. */
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    uint8_t     mdesc;      /**< Media descriptor. */
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    uint16_t    sec_per_fat;    /**< Sectors per FAT12/FAT16. */
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    uint16_t    sec_per_fat;    /**< Sectors per FAT12/FAT16. */
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    uint16_t    sec_per_track;  /**< Sectors per track. */
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    uint16_t    sec_per_track;  /**< Sectors per track. */
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    uint16_t    headcnt;    /**< Number of heads. */
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    uint16_t    headcnt;    /**< Number of heads. */
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    uint32_t    hidden_sec; /**< Hidden sectors. */
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    uint32_t    hidden_sec; /**< Hidden sectors. */
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    uint32_t    totseci32;  /**< Total sectors. 32-bit version. */
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    uint32_t    totsec32;   /**< Total sectors. 32-bit version. */
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    union {
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    union {
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        struct {
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        struct {
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            /* FAT12/FAT16 only: Extended BIOS Parameter Block */
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            /* FAT12/FAT16 only: Extended BIOS Parameter Block */
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            /** Physical drive number. */
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            /** Physical drive number. */
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    };
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    };
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    uint32_t    size;
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    uint32_t    size;
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} __attribute__ ((packed)) fat_dentry_t;
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} __attribute__ ((packed)) fat_dentry_t;
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typedef enum {
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typedef enum {
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    FAT_INVALID,
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    FAT_DIRECTORY,
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    FAT_DIRECTORY,
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    FAT_FILE
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    FAT_FILE
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} fat_node_type_t;
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} fat_node_type_t;
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/** FAT in-core node. */
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/** FAT in-core node. */
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typedef struct {
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typedef struct {
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    fat_node_type_t     type;
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    fat_node_type_t     type;
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    /** VFS index is the node's first allocated cluster. */
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    /** VFS index is the node's first allocated cluster. */
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    fs_index_t      index;
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    fs_index_t      index;
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    /** VFS index of the parent node. */
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    fs_index_t      pindex;
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    dev_handle_t        dev_handle;
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    dev_handle_t        dev_handle;
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    /** FAT in-core node hash table link. */
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    /** FAT in-core node hash table link. */
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    link_t          fin_link;
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    link_t          fin_link;
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    /** FAT in-core node free list link. */
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    link_t          ffn_link;
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    size_t          size;
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    size_t          size;
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    unsigned        lnkcnt;
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    unsigned        lnkcnt;
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    unsigned        refcnt;
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    bool            dirty;
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} fat_node_t;
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} fat_node_t;
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extern fs_reg_t fat_reg;
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extern fs_reg_t fat_reg;
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extern void fat_lookup(ipc_callid_t, ipc_call_t *);
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extern void fat_lookup(ipc_callid_t, ipc_call_t *);