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exfat_core.h
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/*
* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/************************************************************************/
/* */
/* PROJECT : exFAT & FAT12/16/32 File System */
/* FILE : exfat_core.h */
/* PURPOSE : Header File for exFAT File Manager */
/* */
/*----------------------------------------------------------------------*/
/* NOTES */
/* */
/*----------------------------------------------------------------------*/
/* REVISION HISTORY (Ver 0.9) */
/* */
/* - 2010.11.15 [Joosun Hahn] : first writing */
/* */
/************************************************************************/
#ifndef _EXFAT_H
#define _EXFAT_H
#include "exfat_config.h"
#include "exfat_data.h"
#include "exfat_oal.h"
#include "exfat_blkdev.h"
#include "exfat_cache.h"
#include "exfat_nls.h"
#include "exfat_api.h"
#include "exfat_cache.h"
#ifdef CONFIG_EXFAT_KERNEL_DEBUG
/* For Debugging Purpose */
/* IOCTL code 'f' used by
* - file systems typically #0~0x1F
* - embedded terminal devices #128~
* - exts for debugging purpose #99
* number 100 and 101 is availble now but has possible conflicts
*/
#define EXFAT_IOC_GET_DEBUGFLAGS _IOR('f', 100, long)
#define EXFAT_IOC_SET_DEBUGFLAGS _IOW('f', 101, long)
#define EXFAT_DEBUGFLAGS_INVALID_UMOUNT 0x01
#define EXFAT_DEBUGFLAGS_ERROR_RW 0x02
#endif /* CONFIG_EXFAT_KERNEL_DEBUG */
/*----------------------------------------------------------------------*/
/* Constant & Macro Definitions */
/*----------------------------------------------------------------------*/
#define DENTRY_SIZE 32 /* dir entry size */
#define DENTRY_SIZE_BITS 5
/* PBR entries */
#define PBR_SIGNATURE 0xAA55
#define EXT_SIGNATURE 0xAA550000
#define VOL_LABEL "NO NAME " /* size should be 11 */
#define OEM_NAME "MSWIN4.1" /* size should be 8 */
#define STR_FAT12 "FAT12 " /* size should be 8 */
#define STR_FAT16 "FAT16 " /* size should be 8 */
#define STR_FAT32 "FAT32 " /* size should be 8 */
#define STR_EXFAT "EXFAT " /* size should be 8 */
#define VOL_CLEAN 0x0000
#define VOL_DIRTY 0x0002
/* max number of clusters */
#define FAT12_THRESHOLD 4087 /* 2^12 - 1 + 2 (clu 0 & 1) */
#define FAT16_THRESHOLD 65527 /* 2^16 - 1 + 2 */
#define FAT32_THRESHOLD 268435457 /* 2^28 - 1 + 2 */
#define EXFAT_THRESHOLD 268435457 /* 2^28 - 1 + 2 */
/* file types */
#define TYPE_UNUSED 0x0000
#define TYPE_DELETED 0x0001
#define TYPE_INVALID 0x0002
#define TYPE_CRITICAL_PRI 0x0100
#define TYPE_BITMAP 0x0101
#define TYPE_UPCASE 0x0102
#define TYPE_VOLUME 0x0103
#define TYPE_DIR 0x0104
#define TYPE_FILE 0x011F
#define TYPE_SYMLINK 0x015F
#define TYPE_CRITICAL_SEC 0x0200
#define TYPE_STREAM 0x0201
#define TYPE_EXTEND 0x0202
#define TYPE_ACL 0x0203
#define TYPE_BENIGN_PRI 0x0400
#define TYPE_GUID 0x0401
#define TYPE_PADDING 0x0402
#define TYPE_ACLTAB 0x0403
#define TYPE_BENIGN_SEC 0x0800
#define TYPE_ALL 0x0FFF
/* time modes */
#define TM_CREATE 0
#define TM_MODIFY 1
#define TM_ACCESS 2
/* checksum types */
#define CS_DIR_ENTRY 0
#define CS_PBR_SECTOR 1
#define CS_DEFAULT 2
#define CLUSTER_16(x) ((u16)(x))
#define CLUSTER_32(x) ((u32)(x))
#define FALSE 0
#define TRUE 1
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
#define MAX(a, b) (((a) > (b)) ? (a) : (b))
#define START_SECTOR(x) \
((((sector_t)((x) - 2)) << p_fs->sectors_per_clu_bits) + p_fs->data_start_sector)
#define IS_LAST_SECTOR_IN_CLUSTER(sec) \
((((sec) - p_fs->data_start_sector + 1) & ((1 << p_fs->sectors_per_clu_bits) - 1)) == 0)
#define GET_CLUSTER_FROM_SECTOR(sec) \
((u32)((((sec) - p_fs->data_start_sector) >> p_fs->sectors_per_clu_bits) + 2))
#define GET16(p_src) \
(((u16)(p_src)[0]) | (((u16)(p_src)[1]) << 8))
#define GET32(p_src) \
(((u32)(p_src)[0]) | (((u32)(p_src)[1]) << 8) | \
(((u32)(p_src)[2]) << 16) | (((u32)(p_src)[3]) << 24))
#define GET64(p_src) \
(((u64)(p_src)[0]) | (((u64)(p_src)[1]) << 8) | \
(((u64)(p_src)[2]) << 16) | (((u64)(p_src)[3]) << 24) | \
(((u64)(p_src)[4]) << 32) | (((u64)(p_src)[5]) << 40) | \
(((u64)(p_src)[6]) << 48) | (((u64)(p_src)[7]) << 56))
#define SET16(p_dst, src) \
do { \
(p_dst)[0] = (u8)(src); \
(p_dst)[1] = (u8)(((u16)(src)) >> 8); \
} while (0)
#define SET32(p_dst, src) \
do { \
(p_dst)[0] = (u8)(src); \
(p_dst)[1] = (u8)(((u32)(src)) >> 8); \
(p_dst)[2] = (u8)(((u32)(src)) >> 16); \
(p_dst)[3] = (u8)(((u32)(src)) >> 24); \
} while (0)
#define SET64(p_dst, src) \
do { \
(p_dst)[0] = (u8)(src); \
(p_dst)[1] = (u8)(((u64)(src)) >> 8); \
(p_dst)[2] = (u8)(((u64)(src)) >> 16); \
(p_dst)[3] = (u8)(((u64)(src)) >> 24); \
(p_dst)[4] = (u8)(((u64)(src)) >> 32); \
(p_dst)[5] = (u8)(((u64)(src)) >> 40); \
(p_dst)[6] = (u8)(((u64)(src)) >> 48); \
(p_dst)[7] = (u8)(((u64)(src)) >> 56); \
} while (0)
#ifdef __LITTLE_ENDIAN
#define GET16_A(p_src) (*((u16 *)(p_src)))
#define GET32_A(p_src) (*((u32 *)(p_src)))
#define GET64_A(p_src) (*((u64 *)(p_src)))
#define SET16_A(p_dst, src) (*((u16 *)(p_dst)) = (u16)(src))
#define SET32_A(p_dst, src) (*((u32 *)(p_dst)) = (u32)(src))
#define SET64_A(p_dst, src) (*((u64 *)(p_dst)) = (u64)(src))
#else /* BIG_ENDIAN */
#define GET16_A(p_src) GET16(p_src)
#define GET32_A(p_src) GET32(p_src)
#define GET64_A(p_src) GET64(p_src)
#define SET16_A(p_dst, src) SET16(p_dst, src)
#define SET32_A(p_dst, src) SET32(p_dst, src)
#define SET64_A(p_dst, src) SET64(p_dst, src)
#endif
/* Upcase tabel mecro */
#define HIGH_INDEX_BIT (8)
#define HIGH_INDEX_MASK (0xFF00)
#define LOW_INDEX_BIT (16-HIGH_INDEX_BIT)
#define UTBL_ROW_COUNT (1<<LOW_INDEX_BIT)
#define UTBL_COL_COUNT (1<<HIGH_INDEX_BIT)
#if CONFIG_EXFAT_DEBUG_MSG
#define DPRINTK(...) \
do { \
printk("[EXFAT] " __VA_ARGS__); \
} while (0)
#else
#define DPRINTK(...)
#endif
static inline u16 get_col_index(u16 i)
{
return i >> LOW_INDEX_BIT;
}
static inline u16 get_row_index(u16 i)
{
return i & ~HIGH_INDEX_MASK;
}
/*----------------------------------------------------------------------*/
/* Type Definitions */
/*----------------------------------------------------------------------*/
/* MS_DOS FAT partition boot record (512 bytes) */
typedef struct {
u8 jmp_boot[3];
u8 oem_name[8];
u8 bpb[109];
u8 boot_code[390];
u8 signature[2];
} PBR_SECTOR_T;
/* MS-DOS FAT12/16 BIOS parameter block (51 bytes) */
typedef struct {
u8 sector_size[2];
u8 sectors_per_clu;
u8 num_reserved[2];
u8 num_fats;
u8 num_root_entries[2];
u8 num_sectors[2];
u8 media_type;
u8 num_fat_sectors[2];
u8 sectors_in_track[2];
u8 num_heads[2];
u8 num_hid_sectors[4];
u8 num_huge_sectors[4];
u8 phy_drv_no;
u8 reserved;
u8 ext_signature;
u8 vol_serial[4];
u8 vol_label[11];
u8 vol_type[8];
} BPB16_T;
/* MS-DOS FAT32 BIOS parameter block (79 bytes) */
typedef struct {
u8 sector_size[2];
u8 sectors_per_clu;
u8 num_reserved[2];
u8 num_fats;
u8 num_root_entries[2];
u8 num_sectors[2];
u8 media_type;
u8 num_fat_sectors[2];
u8 sectors_in_track[2];
u8 num_heads[2];
u8 num_hid_sectors[4];
u8 num_huge_sectors[4];
u8 num_fat32_sectors[4];
u8 ext_flags[2];
u8 fs_version[2];
u8 root_cluster[4];
u8 fsinfo_sector[2];
u8 backup_sector[2];
u8 reserved[12];
u8 phy_drv_no;
u8 ext_reserved;
u8 ext_signature;
u8 vol_serial[4];
u8 vol_label[11];
u8 vol_type[8];
} BPB32_T;
/* MS-DOS EXFAT BIOS parameter block (109 bytes) */
typedef struct {
u8 reserved1[53];
u8 vol_offset[8];
u8 vol_length[8];
u8 fat_offset[4];
u8 fat_length[4];
u8 clu_offset[4];
u8 clu_count[4];
u8 root_cluster[4];
u8 vol_serial[4];
u8 fs_version[2];
u8 vol_flags[2];
u8 sector_size_bits;
u8 sectors_per_clu_bits;
u8 num_fats;
u8 phy_drv_no;
u8 perc_in_use;
u8 reserved2[7];
} BPBEX_T;
/* MS-DOS FAT file system information sector (512 bytes) */
typedef struct {
u8 signature1[4];
u8 reserved1[480];
u8 signature2[4];
u8 free_cluster[4];
u8 next_cluster[4];
u8 reserved2[14];
u8 signature3[2];
} FSI_SECTOR_T;
/* MS-DOS FAT directory entry (32 bytes) */
typedef struct {
u8 dummy[32];
} DENTRY_T;
typedef struct {
u8 name[DOS_NAME_LENGTH];
u8 attr;
u8 lcase;
u8 create_time_ms;
u8 create_time[2];
u8 create_date[2];
u8 access_date[2];
u8 start_clu_hi[2];
u8 modify_time[2];
u8 modify_date[2];
u8 start_clu_lo[2];
u8 size[4];
} DOS_DENTRY_T;
/* MS-DOS FAT extended directory entry (32 bytes) */
typedef struct {
u8 order;
u8 unicode_0_4[10];
u8 attr;
u8 sysid;
u8 checksum;
u8 unicode_5_10[12];
u8 start_clu[2];
u8 unicode_11_12[4];
} EXT_DENTRY_T;
/* MS-DOS EXFAT file directory entry (32 bytes) */
typedef struct {
u8 type;
u8 num_ext;
u8 checksum[2];
u8 attr[2];
u8 reserved1[2];
u8 create_time[2];
u8 create_date[2];
u8 modify_time[2];
u8 modify_date[2];
u8 access_time[2];
u8 access_date[2];
u8 create_time_ms;
u8 modify_time_ms;
u8 access_time_ms;
u8 reserved2[9];
} FILE_DENTRY_T;
/* MS-DOS EXFAT stream extension directory entry (32 bytes) */
typedef struct {
u8 type;
u8 flags;
u8 reserved1;
u8 name_len;
u8 name_hash[2];
u8 reserved2[2];
u8 valid_size[8];
u8 reserved3[4];
u8 start_clu[4];
u8 size[8];
} STRM_DENTRY_T;
/* MS-DOS EXFAT file name directory entry (32 bytes) */
typedef struct {
u8 type;
u8 flags;
u8 unicode_0_14[30];
} NAME_DENTRY_T;
/* MS-DOS EXFAT allocation bitmap directory entry (32 bytes) */
typedef struct {
u8 type;
u8 flags;
u8 reserved[18];
u8 start_clu[4];
u8 size[8];
} BMAP_DENTRY_T;
/* MS-DOS EXFAT up-case table directory entry (32 bytes) */
typedef struct {
u8 type;
u8 reserved1[3];
u8 checksum[4];
u8 reserved2[12];
u8 start_clu[4];
u8 size[8];
} CASE_DENTRY_T;
/* MS-DOS EXFAT volume label directory entry (32 bytes) */
typedef struct {
u8 type;
u8 label_len;
u8 unicode_0_10[22];
u8 reserved[8];
} VOLM_DENTRY_T;
/* unused entry hint information */
typedef struct {
u32 dir;
s32 entry;
CHAIN_T clu;
} UENTRY_T;
typedef struct {
s32 (*alloc_cluster)(struct super_block *sb, s32 num_alloc, CHAIN_T *p_chain);
void (*free_cluster)(struct super_block *sb, CHAIN_T *p_chain, s32 do_relse);
s32 (*count_used_clusters)(struct super_block *sb);
s32 (*init_dir_entry)(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u32 type,
u32 start_clu, u64 size);
s32 (*init_ext_entry)(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 num_entries,
UNI_NAME_T *p_uniname, DOS_NAME_T *p_dosname);
s32 (*find_dir_entry)(struct super_block *sb, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, s32 num_entries, DOS_NAME_T *p_dosname, u32 type);
void (*delete_dir_entry)(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 offset, s32 num_entries);
void (*get_uni_name_from_ext_entry)(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u16 *uniname);
s32 (*count_ext_entries)(struct super_block *sb, CHAIN_T *p_dir, s32 entry, DENTRY_T *p_entry);
s32 (*calc_num_entries)(UNI_NAME_T *p_uniname);
u32 (*get_entry_type)(DENTRY_T *p_entry);
void (*set_entry_type)(DENTRY_T *p_entry, u32 type);
u32 (*get_entry_attr)(DENTRY_T *p_entry);
void (*set_entry_attr)(DENTRY_T *p_entry, u32 attr);
u8 (*get_entry_flag)(DENTRY_T *p_entry);
void (*set_entry_flag)(DENTRY_T *p_entry, u8 flag);
u32 (*get_entry_clu0)(DENTRY_T *p_entry);
void (*set_entry_clu0)(DENTRY_T *p_entry, u32 clu0);
u64 (*get_entry_size)(DENTRY_T *p_entry);
void (*set_entry_size)(DENTRY_T *p_entry, u64 size);
void (*get_entry_time)(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode);
void (*set_entry_time)(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode);
} FS_FUNC_T;
typedef struct __FS_INFO_T {
u32 drv; /* drive ID */
u32 vol_type; /* volume FAT type */
u32 vol_id; /* volume serial number */
u64 num_sectors; /* num of sectors in volume */
u32 num_clusters; /* num of clusters in volume */
u32 cluster_size; /* cluster size in bytes */
u32 cluster_size_bits;
u32 sectors_per_clu; /* cluster size in sectors */
u32 sectors_per_clu_bits;
u32 PBR_sector; /* PBR sector */
u32 FAT1_start_sector; /* FAT1 start sector */
u32 FAT2_start_sector; /* FAT2 start sector */
u32 root_start_sector; /* root dir start sector */
u32 data_start_sector; /* data area start sector */
u32 num_FAT_sectors; /* num of FAT sectors */
u32 root_dir; /* root dir cluster */
u32 dentries_in_root; /* num of dentries in root dir */
u32 dentries_per_clu; /* num of dentries per cluster */
u32 vol_flag; /* volume dirty flag */
struct buffer_head *pbr_bh; /* PBR sector */
u32 map_clu; /* allocation bitmap start cluster */
u32 map_sectors; /* num of allocation bitmap sectors */
struct buffer_head **vol_amap; /* allocation bitmap */
u16 **vol_utbl; /* upcase table */
u32 clu_srch_ptr; /* cluster search pointer */
u32 used_clusters; /* number of used clusters */
UENTRY_T hint_uentry; /* unused entry hint information */
u32 dev_ejected; /* block device operation error flag */
FS_FUNC_T *fs_func;
struct semaphore v_sem;
/* FAT cache */
BUF_CACHE_T FAT_cache_array[FAT_CACHE_SIZE];
BUF_CACHE_T FAT_cache_lru_list;
BUF_CACHE_T FAT_cache_hash_list[FAT_CACHE_HASH_SIZE];
/* buf cache */
BUF_CACHE_T buf_cache_array[BUF_CACHE_SIZE];
BUF_CACHE_T buf_cache_lru_list;
BUF_CACHE_T buf_cache_hash_list[BUF_CACHE_HASH_SIZE];
} FS_INFO_T;
#define ES_2_ENTRIES 2
#define ES_3_ENTRIES 3
#define ES_ALL_ENTRIES 0
typedef struct {
sector_t sector; /* sector number that contains file_entry */
s32 offset; /* byte offset in the sector */
s32 alloc_flag; /* flag in stream entry. 01 for cluster chain, 03 for contig. clusteres. */
u32 num_entries;
/* __buf should be the last member */
void *__buf;
} ENTRY_SET_CACHE_T;
/*----------------------------------------------------------------------*/
/* External Function Declarations */
/*----------------------------------------------------------------------*/
/* file system initialization & shutdown functions */
s32 ffsInit(void);
s32 ffsShutdown(void);
/* volume management functions */
s32 ffsMountVol(struct super_block *sb);
s32 ffsUmountVol(struct super_block *sb);
s32 ffsCheckVol(struct super_block *sb);
s32 ffsGetVolInfo(struct super_block *sb, VOL_INFO_T *info);
s32 ffsSyncVol(struct super_block *sb, s32 do_sync);
/* file management functions */
s32 ffsLookupFile(struct inode *inode, char *path, FILE_ID_T *fid);
s32 ffsCreateFile(struct inode *inode, char *path, u8 mode, FILE_ID_T *fid);
s32 ffsReadFile(struct inode *inode, FILE_ID_T *fid, void *buffer, u64 count, u64 *rcount);
s32 ffsWriteFile(struct inode *inode, FILE_ID_T *fid, void *buffer, u64 count, u64 *wcount);
s32 ffsTruncateFile(struct inode *inode, u64 old_size, u64 new_size);
s32 ffsMoveFile(struct inode *old_parent_inode, FILE_ID_T *fid, struct inode *new_parent_inode, struct dentry *new_dentry);
s32 ffsRemoveFile(struct inode *inode, FILE_ID_T *fid);
s32 ffsSetAttr(struct inode *inode, u32 attr);
s32 ffsGetStat(struct inode *inode, DIR_ENTRY_T *info);
s32 ffsSetStat(struct inode *inode, DIR_ENTRY_T *info);
s32 ffsMapCluster(struct inode *inode, s32 clu_offset, u32 *clu);
/* directory management functions */
s32 ffsCreateDir(struct inode *inode, char *path, FILE_ID_T *fid);
s32 ffsReadDir(struct inode *inode, DIR_ENTRY_T *dir_ent);
s32 ffsRemoveDir(struct inode *inode, FILE_ID_T *fid);
/*----------------------------------------------------------------------*/
/* External Function Declarations (NOT TO UPPER LAYER) */
/*----------------------------------------------------------------------*/
/* fs management functions */
s32 fs_init(void);
s32 fs_shutdown(void);
void fs_set_vol_flags(struct super_block *sb, u32 new_flag);
void fs_sync(struct super_block *sb, s32 do_sync);
void fs_error(struct super_block *sb);
/* cluster management functions */
s32 clear_cluster(struct super_block *sb, u32 clu);
s32 fat_alloc_cluster(struct super_block *sb, s32 num_alloc, CHAIN_T *p_chain);
s32 exfat_alloc_cluster(struct super_block *sb, s32 num_alloc, CHAIN_T *p_chain);
void fat_free_cluster(struct super_block *sb, CHAIN_T *p_chain, s32 do_relse);
void exfat_free_cluster(struct super_block *sb, CHAIN_T *p_chain, s32 do_relse);
u32 find_last_cluster(struct super_block *sb, CHAIN_T *p_chain);
s32 count_num_clusters(struct super_block *sb, CHAIN_T *dir);
s32 fat_count_used_clusters(struct super_block *sb);
s32 exfat_count_used_clusters(struct super_block *sb);
void exfat_chain_cont_cluster(struct super_block *sb, u32 chain, s32 len);
/* allocation bitmap management functions */
s32 load_alloc_bitmap(struct super_block *sb);
void free_alloc_bitmap(struct super_block *sb);
s32 set_alloc_bitmap(struct super_block *sb, u32 clu);
s32 clr_alloc_bitmap(struct super_block *sb, u32 clu);
u32 test_alloc_bitmap(struct super_block *sb, u32 clu);
void sync_alloc_bitmap(struct super_block *sb);
/* upcase table management functions */
s32 load_upcase_table(struct super_block *sb);
void free_upcase_table(struct super_block *sb);
/* dir entry management functions */
u32 fat_get_entry_type(DENTRY_T *p_entry);
u32 exfat_get_entry_type(DENTRY_T *p_entry);
void fat_set_entry_type(DENTRY_T *p_entry, u32 type);
void exfat_set_entry_type(DENTRY_T *p_entry, u32 type);
u32 fat_get_entry_attr(DENTRY_T *p_entry);
u32 exfat_get_entry_attr(DENTRY_T *p_entry);
void fat_set_entry_attr(DENTRY_T *p_entry, u32 attr);
void exfat_set_entry_attr(DENTRY_T *p_entry, u32 attr);
u8 fat_get_entry_flag(DENTRY_T *p_entry);
u8 exfat_get_entry_flag(DENTRY_T *p_entry);
void fat_set_entry_flag(DENTRY_T *p_entry, u8 flag);
void exfat_set_entry_flag(DENTRY_T *p_entry, u8 flag);
u32 fat_get_entry_clu0(DENTRY_T *p_entry);
u32 exfat_get_entry_clu0(DENTRY_T *p_entry);
void fat_set_entry_clu0(DENTRY_T *p_entry, u32 start_clu);
void exfat_set_entry_clu0(DENTRY_T *p_entry, u32 start_clu);
u64 fat_get_entry_size(DENTRY_T *p_entry);
u64 exfat_get_entry_size(DENTRY_T *p_entry);
void fat_set_entry_size(DENTRY_T *p_entry, u64 size);
void exfat_set_entry_size(DENTRY_T *p_entry, u64 size);
void fat_get_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode);
void exfat_get_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode);
void fat_set_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode);
void exfat_set_entry_time(DENTRY_T *p_entry, TIMESTAMP_T *tp, u8 mode);
s32 fat_init_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u32 type, u32 start_clu, u64 size);
s32 exfat_init_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u32 type, u32 start_clu, u64 size);
s32 fat_init_ext_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 num_entries, UNI_NAME_T *p_uniname, DOS_NAME_T *p_dosname);
s32 exfat_init_ext_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 num_entries, UNI_NAME_T *p_uniname, DOS_NAME_T *p_dosname);
void init_dos_entry(DOS_DENTRY_T *ep, u32 type, u32 start_clu);
void init_ext_entry(EXT_DENTRY_T *ep, s32 order, u8 chksum, u16 *uniname);
void init_file_entry(FILE_DENTRY_T *ep, u32 type);
void init_strm_entry(STRM_DENTRY_T *ep, u8 flags, u32 start_clu, u64 size);
void init_name_entry(NAME_DENTRY_T *ep, u16 *uniname);
void fat_delete_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 order, s32 num_entries);
void exfat_delete_dir_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, s32 order, s32 num_entries);
s32 find_location(struct super_block *sb, CHAIN_T *p_dir, s32 entry, sector_t *sector, s32 *offset);
DENTRY_T *get_entry_with_sector(struct super_block *sb, sector_t sector, s32 offset);
DENTRY_T *get_entry_in_dir(struct super_block *sb, CHAIN_T *p_dir, s32 entry, sector_t *sector);
ENTRY_SET_CACHE_T *get_entry_set_in_dir(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u32 type, DENTRY_T **file_ep);
void release_entry_set(ENTRY_SET_CACHE_T *es);
s32 write_whole_entry_set(struct super_block *sb, ENTRY_SET_CACHE_T *es);
s32 write_partial_entries_in_entry_set(struct super_block *sb, ENTRY_SET_CACHE_T *es, DENTRY_T *ep, u32 count);
s32 search_deleted_or_unused_entry(struct super_block *sb, CHAIN_T *p_dir, s32 num_entries);
s32 find_empty_entry(struct inode *inode, CHAIN_T *p_dir, s32 num_entries);
s32 fat_find_dir_entry(struct super_block *sb, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, s32 num_entries, DOS_NAME_T *p_dosname, u32 type);
s32 exfat_find_dir_entry(struct super_block *sb, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, s32 num_entries, DOS_NAME_T *p_dosname, u32 type);
s32 fat_count_ext_entries(struct super_block *sb, CHAIN_T *p_dir, s32 entry, DENTRY_T *p_entry);
s32 exfat_count_ext_entries(struct super_block *sb, CHAIN_T *p_dir, s32 entry, DENTRY_T *p_entry);
s32 count_dos_name_entries(struct super_block *sb, CHAIN_T *p_dir, u32 type);
void update_dir_checksum(struct super_block *sb, CHAIN_T *p_dir, s32 entry);
void update_dir_checksum_with_entry_set(struct super_block *sb, ENTRY_SET_CACHE_T *es);
bool is_dir_empty(struct super_block *sb, CHAIN_T *p_dir);
/* name conversion functions */
s32 get_num_entries_and_dos_name(struct super_block *sb, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, s32 *entries, DOS_NAME_T *p_dosname);
void get_uni_name_from_dos_entry(struct super_block *sb, DOS_DENTRY_T *ep, UNI_NAME_T *p_uniname, u8 mode);
void fat_get_uni_name_from_ext_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u16 *uniname);
void exfat_get_uni_name_from_ext_entry(struct super_block *sb, CHAIN_T *p_dir, s32 entry, u16 *uniname);
s32 extract_uni_name_from_ext_entry(EXT_DENTRY_T *ep, u16 *uniname, s32 order);
s32 extract_uni_name_from_name_entry(NAME_DENTRY_T *ep, u16 *uniname, s32 order);
s32 fat_generate_dos_name(struct super_block *sb, CHAIN_T *p_dir, DOS_NAME_T *p_dosname);
void fat_attach_count_to_dos_name(u8 *dosname, s32 count);
s32 fat_calc_num_entries(UNI_NAME_T *p_uniname);
s32 exfat_calc_num_entries(UNI_NAME_T *p_uniname);
u8 calc_checksum_1byte(void *data, s32 len, u8 chksum);
u16 calc_checksum_2byte(void *data, s32 len, u16 chksum, s32 type);
u32 calc_checksum_4byte(void *data, s32 len, u32 chksum, s32 type);
/* name resolution functions */
s32 resolve_path(struct inode *inode, char *path, CHAIN_T *p_dir, UNI_NAME_T *p_uniname);
s32 resolve_name(u8 *name, u8 **arg);
/* file operation functions */
s32 fat16_mount(struct super_block *sb, PBR_SECTOR_T *p_pbr);
s32 fat32_mount(struct super_block *sb, PBR_SECTOR_T *p_pbr);
s32 exfat_mount(struct super_block *sb, PBR_SECTOR_T *p_pbr);
s32 create_dir(struct inode *inode, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, FILE_ID_T *fid);
s32 create_file(struct inode *inode, CHAIN_T *p_dir, UNI_NAME_T *p_uniname, u8 mode, FILE_ID_T *fid);
void remove_file(struct inode *inode, CHAIN_T *p_dir, s32 entry);
s32 rename_file(struct inode *inode, CHAIN_T *p_dir, s32 old_entry, UNI_NAME_T *p_uniname, FILE_ID_T *fid);
s32 move_file(struct inode *inode, CHAIN_T *p_olddir, s32 oldentry, CHAIN_T *p_newdir, UNI_NAME_T *p_uniname, FILE_ID_T *fid);
/* sector read/write functions */
s32 sector_read(struct super_block *sb, sector_t sec, struct buffer_head **bh, s32 read);
s32 sector_write(struct super_block *sb, sector_t sec, struct buffer_head *bh, s32 sync);
s32 multi_sector_read(struct super_block *sb, sector_t sec, struct buffer_head **bh, s32 num_secs, s32 read);
s32 multi_sector_write(struct super_block *sb, sector_t sec, struct buffer_head *bh, s32 num_secs, s32 sync);
#endif /* _EXFAT_H */