exfat: add in-memory and on-disk structures and headers

/* SPDX-License-Identifier: GPL-2.0-or-later */

/*

 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.

 */

#ifndef _EXFAT_FS_H

#define _EXFAT_FS_H

#include <linux/fs.h>

#include <linux/ratelimit.h>

#include <linux/nls.h>

#define EXFAT_SUPER_MAGIC       0x2011BAB0UL

#define EXFAT_ROOT_INO		1

#define EXFAT_SB_DIRTY		0

#define EXFAT_CLUSTERS_UNTRACKED (~0u)

/*

 * exfat error flags

 */

enum exfat_error_mode {

	EXFAT_ERRORS_CONT,	/* ignore error and continue */

	EXFAT_ERRORS_PANIC,	/* panic on error */

	EXFAT_ERRORS_RO,	/* remount r/o on error */

};

/*

 * exfat nls lossy flag

 */

enum {

	NLS_NAME_NO_LOSSY,	/* no lossy */

	NLS_NAME_LOSSY,		/* just detected incorrect filename(s) */

	NLS_NAME_OVERLEN,	/* the length is over than its limit */

};

#define EXFAT_HASH_BITS		8

#define EXFAT_HASH_SIZE		(1UL << EXFAT_HASH_BITS)

/*

 * Type Definitions

 */

#define ES_2_ENTRIES		2

#define ES_ALL_ENTRIES		0

#define DIR_DELETED		0xFFFF0321

/* type values */

#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_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

#define MAX_CHARSET_SIZE	6 /* max size of multi-byte character */

#define MAX_NAME_LENGTH		255 /* max len of file name excluding NULL */

#define MAX_VFSNAME_BUF_SIZE	((MAX_NAME_LENGTH + 1) * MAX_CHARSET_SIZE)

#define FAT_CACHE_SIZE		128

#define FAT_CACHE_HASH_SIZE	64

#define BUF_CACHE_SIZE		256

#define BUF_CACHE_HASH_SIZE	64

#define EXFAT_HINT_NONE		-1

#define EXFAT_MIN_SUBDIR	2

/*

 * helpers for cluster size to byte conversion.

 */

#define EXFAT_CLU_TO_B(b, sbi)		((b) << (sbi)->cluster_size_bits)

#define EXFAT_B_TO_CLU(b, sbi)		((b) >> (sbi)->cluster_size_bits)

#define EXFAT_B_TO_CLU_ROUND_UP(b, sbi)	\

	(((b - 1) >> (sbi)->cluster_size_bits) + 1)

#define EXFAT_CLU_OFFSET(off, sbi)	((off) & ((sbi)->cluster_size - 1))

/*

 * helpers for block size to byte conversion.

 */

#define EXFAT_BLK_TO_B(b, sb)		((b) << (sb)->s_blocksize_bits)

#define EXFAT_B_TO_BLK(b, sb)		((b) >> (sb)->s_blocksize_bits)

#define EXFAT_B_TO_BLK_ROUND_UP(b, sb)	\

	(((b - 1) >> (sb)->s_blocksize_bits) + 1)

#define EXFAT_BLK_OFFSET(off, sb)	((off) & ((sb)->s_blocksize - 1))

/*

 * helpers for block size to dentry size conversion.

 */

#define EXFAT_B_TO_DEN_IDX(b, sbi)	\

	((b) << ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS))

#define EXFAT_B_TO_DEN(b)		((b) >> DENTRY_SIZE_BITS)

#define EXFAT_DEN_TO_B(b)		((b) << DENTRY_SIZE_BITS)

/*

 * helpers for fat entry.

 */

#define FAT_ENT_SIZE (4)

#define FAT_ENT_SIZE_BITS (2)

#define FAT_ENT_OFFSET_SECTOR(sb, loc) (EXFAT_SB(sb)->FAT1_start_sector + \

	(((u64)loc << FAT_ENT_SIZE_BITS) >> sb->s_blocksize_bits))

#define FAT_ENT_OFFSET_BYTE_IN_SECTOR(sb, loc)	\

	((loc << FAT_ENT_SIZE_BITS) & (sb->s_blocksize - 1))

/*

 * helpers for bitmap.

 */

#define CLUSTER_TO_BITMAP_ENT(clu) ((clu) - EXFAT_RESERVED_CLUSTERS)

#define BITMAP_ENT_TO_CLUSTER(ent) ((ent) + EXFAT_RESERVED_CLUSTERS)

#define BITS_PER_SECTOR(sb) ((sb)->s_blocksize * BITS_PER_BYTE)

#define BITS_PER_SECTOR_MASK(sb) (BITS_PER_SECTOR(sb) - 1)

#define BITMAP_OFFSET_SECTOR_INDEX(sb, ent) \

	((ent / BITS_PER_BYTE) >> (sb)->s_blocksize_bits)

#define BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent) (ent & BITS_PER_SECTOR_MASK(sb))

#define BITMAP_OFFSET_BYTE_IN_SECTOR(sb, ent) \

	((ent / BITS_PER_BYTE) & ((sb)->s_blocksize - 1))

#define BITS_PER_BYTE_MASK	0x7

#define IGNORED_BITS_REMAINED(clu, clu_base) ((1 << ((clu) - (clu_base))) - 1)

struct exfat_dentry_namebuf {

	char *lfn;

	int lfnbuf_len; /* usally MAX_UNINAME_BUF_SIZE */

};

/* unicode name structure */

struct exfat_uni_name {

	/* +3 for null and for converting */

	unsigned short name[MAX_NAME_LENGTH + 3];

	unsigned short name_hash;

	unsigned char name_len;

};

/* directory structure */

struct exfat_chain {

	unsigned int dir;

	unsigned int size;

	unsigned char flags;

};

/* first empty entry hint information */

struct exfat_hint_femp {

	/* entry index of a directory */

	int eidx;

	/* count of continuous empty entry */

	int count;

	/* the cluster that first empty slot exists in */

	struct exfat_chain cur;

};

/* hint structure */

struct exfat_hint {

	unsigned int clu;

	union {

		unsigned int off; /* cluster offset */

		int eidx; /* entry index */

	};

};

struct exfat_entry_set_cache {

	/* sector number that contains file_entry */

	sector_t sector;

	/* byte offset in the sector */

	unsigned int offset;

	/* flag in stream entry. 01 for cluster chain, 03 for contig. */

	int alloc_flag;

	unsigned int num_entries;

	struct exfat_dentry entries[];

};

struct exfat_dir_entry {

	struct exfat_chain dir;

	int entry;

	unsigned int type;

	unsigned int start_clu;

	unsigned char flags;

	unsigned short attr;

	loff_t size;

	unsigned int num_subdirs;

	struct timespec64 atime;

	struct timespec64 mtime;

	struct timespec64 crtime;

	struct exfat_dentry_namebuf namebuf;

};

/*

 * exfat mount in-memory data

 */

struct exfat_mount_options {

	kuid_t fs_uid;

	kgid_t fs_gid;

	unsigned short fs_fmask;

	unsigned short fs_dmask;

	/* permission for setting the [am]time */

	unsigned short allow_utime;

	/* charset for filename input/display */

	char *iocharset;

	/* on error: continue, panic, remount-ro */

	enum exfat_error_mode errors;

	unsigned utf8:1, /* Use of UTF-8 character set */

		 discard:1; /* Issue discard requests on deletions */

	int time_offset; /* Offset of timestamps from UTC (in minutes) */

};

/*

 * EXFAT file system superblock in-memory data

 */

struct exfat_sb_info {

	unsigned long long num_sectors; /* num of sectors in volume */

	unsigned int num_clusters; /* num of clusters in volume */

	unsigned int cluster_size; /* cluster size in bytes */

	unsigned int cluster_size_bits;

	unsigned int sect_per_clus; /* cluster size in sectors */

	unsigned int sect_per_clus_bits;

	unsigned long long FAT1_start_sector; /* FAT1 start sector */

	unsigned long long FAT2_start_sector; /* FAT2 start sector */

	unsigned long long data_start_sector; /* data area start sector */

	unsigned int num_FAT_sectors; /* num of FAT sectors */

	unsigned int root_dir; /* root dir cluster */

	unsigned int dentries_per_clu; /* num of dentries per cluster */

	unsigned int vol_flag; /* volume dirty flag */

	struct buffer_head *pbr_bh; /* buffer_head of PBR sector */

	unsigned int map_clu; /* allocation bitmap start cluster */

	unsigned int map_sectors; /* num of allocation bitmap sectors */

	struct buffer_head **vol_amap; /* allocation bitmap */

	unsigned short *vol_utbl; /* upcase table */

	unsigned int clu_srch_ptr; /* cluster search pointer */

	unsigned int used_clusters; /* number of used clusters */

	unsigned long s_state;

	struct mutex s_lock; /* superblock lock */

	struct exfat_mount_options options;

	struct nls_table *nls_io; /* Charset used for input and display */

	struct ratelimit_state ratelimit;

	spinlock_t inode_hash_lock;

	struct hlist_head inode_hashtable[EXFAT_HASH_SIZE];

	struct rcu_head rcu;

};

/*

 * EXFAT file system inode in-memory data

 */

struct exfat_inode_info {

	struct exfat_chain dir;

	int entry;

	unsigned int type;

	unsigned short attr;

	unsigned int start_clu;

	unsigned char flags;

	/*

	 * the copy of low 32bit of i_version to check

	 * the validation of hint_stat.

	 */

	unsigned int version;

	/* file offset or dentry index for readdir */

	loff_t rwoffset;

	/* hint for cluster last accessed */

	struct exfat_hint hint_bmap;

	/* hint for entry index we try to lookup next time */

	struct exfat_hint hint_stat;

	/* hint for first empty entry */

	struct exfat_hint_femp hint_femp;

	spinlock_t cache_lru_lock;

	struct list_head cache_lru;

	int nr_caches;

	/* for avoiding the race between alloc and free */

	unsigned int cache_valid_id;

	/*

	 * NOTE: i_size_ondisk is 64bits, so must hold ->inode_lock to access.

	 * physically allocated size.

	 */

	loff_t i_size_ondisk;

	/* block-aligned i_size (used in cont_write_begin) */

	loff_t i_size_aligned;

	/* on-disk position of directory entry or 0 */

	loff_t i_pos;

	/* hash by i_location */

	struct hlist_node i_hash_fat;

	/* protect bmap against truncate */

	struct rw_semaphore truncate_lock;

	struct inode vfs_inode;

	/* File creation time */

	struct timespec64 i_crtime;

};

static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb)

{

	return sb->s_fs_info;

}

static inline struct exfat_inode_info *EXFAT_I(struct inode *inode)

{

	return container_of(inode, struct exfat_inode_info, vfs_inode);

}

/*

 * If ->i_mode can't hold 0222 (i.e. ATTR_RO), we use ->i_attrs to

 * save ATTR_RO instead of ->i_mode.

 *

 * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only

 * bit, it's just used as flag for app.

 */

static inline int exfat_mode_can_hold_ro(struct inode *inode)

{

	struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);

	if (S_ISDIR(inode->i_mode))

		return 0;

	if ((~sbi->options.fs_fmask) & 0222)

		return 1;

	return 0;

}

/* Convert attribute bits and a mask to the UNIX mode. */

static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi,

		unsigned short attr, mode_t mode)

{

	if ((attr & ATTR_READONLY) && !(attr & ATTR_SUBDIR))

		mode &= ~0222;

	if (attr & ATTR_SUBDIR)

		return (mode & ~sbi->options.fs_dmask) | S_IFDIR;

	return (mode & ~sbi->options.fs_fmask) | S_IFREG;

}

/* Return the FAT attribute byte for this inode */

static inline unsigned short exfat_make_attr(struct inode *inode)

{

	unsigned short attr = EXFAT_I(inode)->attr;

	if (S_ISDIR(inode->i_mode))

		attr |= ATTR_SUBDIR;

	if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222))

		attr |= ATTR_READONLY;

	return attr;

}

static inline void exfat_save_attr(struct inode *inode, unsigned short attr)

{

	if (exfat_mode_can_hold_ro(inode))

		EXFAT_I(inode)->attr = attr & (ATTR_RWMASK | ATTR_READONLY);

	else

		EXFAT_I(inode)->attr = attr & ATTR_RWMASK;

}

static inline bool exfat_is_last_sector_in_cluster(struct exfat_sb_info *sbi,

		sector_t sec)

{

	return ((sec - sbi->data_start_sector + 1) &

		((1 << sbi->sect_per_clus_bits) - 1)) == 0;

}

static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi,

		unsigned int clus)

{

	return ((clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) +

		sbi->data_start_sector;

}

static inline int exfat_sector_to_cluster(struct exfat_sb_info *sbi,

		sector_t sec)

{

	return ((sec - sbi->data_start_sector) >> sbi->sect_per_clus_bits) +

		EXFAT_RESERVED_CLUSTERS;

}

/* super.c */

int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flag);

/* fatent.c */

#define exfat_get_next_cluster(sb, pclu) exfat_ent_get(sb, *(pclu), pclu)

int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,

		struct exfat_chain *p_chain);

int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain);

int exfat_ent_get(struct super_block *sb, unsigned int loc,

		unsigned int *content);

int exfat_ent_set(struct super_block *sb, unsigned int loc,

		unsigned int content);

int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir,

		int entry, struct exfat_dentry *p_entry);

int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain,

		unsigned int len);

int exfat_zeroed_cluster(struct inode *dir, unsigned int clu);

int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain,

		unsigned int *ret_clu);

int exfat_count_num_clusters(struct super_block *sb,

		struct exfat_chain *p_chain, unsigned int *ret_count);

/* balloc.c */

int exfat_load_bitmap(struct super_block *sb);

void exfat_free_bitmap(struct exfat_sb_info *sbi);

int exfat_set_bitmap(struct inode *inode, unsigned int clu);

void exfat_clear_bitmap(struct inode *inode, unsigned int clu);

unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu);

int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count);

/* file.c */

extern const struct file_operations exfat_file_operations;

int __exfat_truncate(struct inode *inode, loff_t new_size);

void exfat_truncate(struct inode *inode, loff_t size);

int exfat_setattr(struct dentry *dentry, struct iattr *attr);

int exfat_getattr(const struct path *path, struct kstat *stat,

		unsigned int request_mask, unsigned int query_flags);

/* namei.c */

extern const struct dentry_operations exfat_dentry_ops;

extern const struct dentry_operations exfat_utf8_dentry_ops;

/* cache.c */

int exfat_cache_init(void);

void exfat_cache_shutdown(void);

void exfat_cache_init_inode(struct inode *inode);

void exfat_cache_inval_inode(struct inode *inode);

int exfat_get_cluster(struct inode *inode, unsigned int cluster,

		unsigned int *fclus, unsigned int *dclus,

		unsigned int *last_dclus, int allow_eof);

/* dir.c */

extern const struct inode_operations exfat_dir_inode_operations;

extern const struct file_operations exfat_dir_operations;

unsigned int exfat_get_entry_type(struct exfat_dentry *p_entry);

int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir,

		int entry, unsigned int type, unsigned int start_clu,

		unsigned long long size);

int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,

		int entry, int num_entries, struct exfat_uni_name *p_uniname);

int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir,

		int entry, int order, int num_entries);

int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir,

		int entry);

int exfat_update_dir_chksum_with_entry_set(struct super_block *sb,

		struct exfat_entry_set_cache *es, int sync);

int exfat_calc_num_entries(struct exfat_uni_name *p_uniname);

int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei,

		struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,

		int num_entries, unsigned int type);

int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu);

int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir,

		int entry, sector_t *sector, int *offset);

struct exfat_dentry *exfat_get_dentry(struct super_block *sb,

		struct exfat_chain *p_dir, int entry, struct buffer_head **bh,

		sector_t *sector);

struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb,

		struct exfat_chain *p_dir, int entry, unsigned int type,

		struct exfat_dentry **file_ep);

int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir);

/* inode.c */

extern const struct inode_operations exfat_file_inode_operations;

void exfat_sync_inode(struct inode *inode);

struct inode *exfat_build_inode(struct super_block *sb,

		struct exfat_dir_entry *info, loff_t i_pos);

void exfat_hash_inode(struct inode *inode, loff_t i_pos);

void exfat_unhash_inode(struct inode *inode);

struct inode *exfat_iget(struct super_block *sb, loff_t i_pos);

int exfat_write_inode(struct inode *inode, struct writeback_control *wbc);

void exfat_evict_inode(struct inode *inode);

int exfat_block_truncate_page(struct inode *inode, loff_t from);

/* exfat/nls.c */

unsigned short exfat_toupper(struct super_block *sb, unsigned short a);

int exfat_uniname_ncmp(struct super_block *sb, unsigned short *a,

		unsigned short *b, unsigned int len);

int exfat_utf16_to_nls(struct super_block *sb,

		struct exfat_uni_name *uniname, unsigned char *p_cstring,

		int len);

int exfat_nls_to_utf16(struct super_block *sb,

		const unsigned char *p_cstring, const int len,

		struct exfat_uni_name *uniname, int *p_lossy);

int exfat_create_upcase_table(struct super_block *sb);

void exfat_free_upcase_table(struct exfat_sb_info *sbi);

unsigned short exfat_high_surrogate(unicode_t u);

unsigned short exfat_low_surrogate(unicode_t u);

/* exfat/misc.c */

void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)

		__printf(3, 4) __cold;

#define exfat_fs_error(sb, fmt, args...)          \

		__exfat_fs_error(sb, 1, fmt, ## args)

#define exfat_fs_error_ratelimit(sb, fmt, args...) \

		__exfat_fs_error(sb, __ratelimit(&EXFAT_SB(sb)->ratelimit), \

		fmt, ## args)

void exfat_msg(struct super_block *sb, const char *lv, const char *fmt, ...)

		__printf(3, 4) __cold;

void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,

		u8 tz, __le16 time, __le16 date, u8 time_ms);

void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,

		u8 *tz, __le16 *time, __le16 *date, u8 *time_ms);

unsigned short exfat_calc_chksum_2byte(void *data, int len,

		unsigned short chksum, int type);

void exfat_update_bh(struct super_block *sb, struct buffer_head *bh, int sync);

void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,

		unsigned int size, unsigned char flags);

void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec);

#endif /* !_EXFAT_FS_H */

/* SPDX-License-Identifier: GPL-2.0-or-later */

/*

 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.

 */

#ifndef _EXFAT_RAW_H

#define _EXFAT_RAW_H

#include <linux/types.h>

#define PBR_SIGNATURE		0xAA55

#define EXFAT_MAX_FILE_LEN	255

#define VOL_CLEAN		0x0000

#define VOL_DIRTY		0x0002

#define EXFAT_EOF_CLUSTER	0xFFFFFFFFu

#define EXFAT_BAD_CLUSTER	0xFFFFFFF7u

#define EXFAT_FREE_CLUSTER	0

/* Cluster 0, 1 are reserved, the first cluster is 2 in the cluster heap. */

#define EXFAT_RESERVED_CLUSTERS	2

#define EXFAT_FIRST_CLUSTER	2

#define EXFAT_DATA_CLUSTER_COUNT(sbi)	\

	((sbi)->num_clusters - EXFAT_RESERVED_CLUSTERS)

/* AllocationPossible and NoFatChain field in GeneralSecondaryFlags Field */

#define ALLOC_FAT_CHAIN		0x01

#define ALLOC_NO_FAT_CHAIN	0x03

#define DENTRY_SIZE		32 /* directory entry size */

#define DENTRY_SIZE_BITS	5

/* exFAT allows 8388608(256MB) directory entries */

#define MAX_EXFAT_DENTRIES	8388608

/* dentry types */

#define EXFAT_UNUSED		0x00	/* end of directory */

#define EXFAT_DELETE		(~0x80)

#define IS_EXFAT_DELETED(x)	((x) < 0x80) /* deleted file (0x01~0x7F) */

#define EXFAT_INVAL		0x80	/* invalid value */

#define EXFAT_BITMAP		0x81	/* allocation bitmap */

#define EXFAT_UPCASE		0x82	/* upcase table */

#define EXFAT_VOLUME		0x83	/* volume label */

#define EXFAT_FILE		0x85	/* file or dir */

#define EXFAT_GUID		0xA0

#define EXFAT_PADDING		0xA1

#define EXFAT_ACLTAB		0xA2

#define EXFAT_STREAM		0xC0	/* stream entry */

#define EXFAT_NAME		0xC1	/* file name entry */

#define EXFAT_ACL		0xC2	/* stream entry */

#define IS_EXFAT_CRITICAL_PRI(x)	(x < 0xA0)

#define IS_EXFAT_BENIGN_PRI(x)		(x < 0xC0)

#define IS_EXFAT_CRITICAL_SEC(x)	(x < 0xE0)

/* checksum types */

#define CS_DIR_ENTRY		0

#define CS_PBR_SECTOR		1

#define CS_DEFAULT		2

/* file attributes */

#define ATTR_READONLY		0x0001

#define ATTR_HIDDEN		0x0002

#define ATTR_SYSTEM		0x0004

#define ATTR_VOLUME		0x0008

#define ATTR_SUBDIR		0x0010

#define ATTR_ARCHIVE		0x0020

#define ATTR_RWMASK		(ATTR_HIDDEN | ATTR_SYSTEM | ATTR_VOLUME | \

				 ATTR_SUBDIR | ATTR_ARCHIVE)

#define PBR64_JUMP_BOOT_LEN		3

#define PBR64_OEM_NAME_LEN		8

#define PBR64_RESERVED_LEN		53

#define EXFAT_FILE_NAME_LEN		15

/* EXFAT BIOS parameter block (64 bytes) */

struct bpb64 {

	__u8 jmp_boot[PBR64_JUMP_BOOT_LEN];

	__u8 oem_name[PBR64_OEM_NAME_LEN];

	__u8 res_zero[PBR64_RESERVED_LEN];

} __packed;

/* EXFAT EXTEND BIOS parameter block (56 bytes) */

struct bsx64 {

	__le64 vol_offset;

	__le64 vol_length;

	__le32 fat_offset;

	__le32 fat_length;

	__le32 clu_offset;

	__le32 clu_count;

	__le32 root_cluster;

	__le32 vol_serial;

	__u8 fs_version[2];

	__le16 vol_flags;

	__u8 sect_size_bits;

	__u8 sect_per_clus_bits;

	__u8 num_fats;

	__u8 phy_drv_no;

	__u8 perc_in_use;

	__u8 reserved2[7];

} __packed;

/* EXFAT PBR[BPB+BSX] (120 bytes) */

struct pbr64 {

	struct bpb64 bpb;

	struct bsx64 bsx;

} __packed;

/* Common PBR[Partition Boot Record] (512 bytes) */

struct pbr {

	union {

		__u8 raw[64];

		struct bpb64 f64;

	} bpb;

	union {

		__u8 raw[56];

		struct bsx64 f64;

	} bsx;

	__u8 boot_code[390];

	__le16 signature;

} __packed;

struct exfat_dentry {

	__u8 type;

	union {

		struct {

			__u8 num_ext;

			__le16 checksum;

			__le16 attr;

			__le16 reserved1;

			__le16 create_time;

			__le16 create_date;

			__le16 modify_time;

			__le16 modify_date;

			__le16 access_time;

			__le16 access_date;

			__u8 create_time_ms;

			__u8 modify_time_ms;

			__u8 create_tz;

			__u8 modify_tz;

			__u8 access_tz;

			__u8 reserved2[7];

		} __packed file; /* file directory entry */

		struct {

			__u8 flags;

			__u8 reserved1;

			__u8 name_len;

			__le16 name_hash;

			__le16 reserved2;

			__le64 valid_size;

			__le32 reserved3;

			__le32 start_clu;

			__le64 size;

		} __packed stream; /* stream extension directory entry */

		struct {

			__u8 flags;

			__le16 unicode_0_14[EXFAT_FILE_NAME_LEN];

		} __packed name; /* file name directory entry */

		struct {

			__u8 flags;

			__u8 reserved[18];

			__le32 start_clu;

			__le64 size;

		} __packed bitmap; /* allocation bitmap directory entry */

		struct {

			__u8 reserved1[3];

			__le32 checksum;

			__u8 reserved2[12];

			__le32 start_clu;

			__le64 size;

		} __packed upcase; /* up-case table directory entry */

	} __packed dentry;

} __packed;

#define EXFAT_TZ_VALID		(1 << 7)

/* Jan 1 GMT 00:00:00 1980 */

#define EXFAT_MIN_TIMESTAMP_SECS    315532800LL

/* Dec 31 GMT 23:59:59 2107 */

#define EXFAT_MAX_TIMESTAMP_SECS    4354819199LL

#endif /* !_EXFAT_RAW_H */