From 1acf1a564b6034b5af1e7fb23cb98cb3bb4f6003 Mon Sep 17 00:00:00 2001

From: Namjae Jeon <namjae.jeon@samsung.com>

Date: Mon, 2 Mar 2020 15:21:32 +0900

Subject: [Backport 1acf1a564b60] exfat: add in-memory and on-disk structures

 and headers

MIME-Version: 1.0

Content-Type: text/plain; charset=UTF-8

Content-Transfer-Encoding: 8bit

This adds in-memory and on-disk structures and headers.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>

Signed-off-by: Sungjong Seo <sj1557.seo@samsung.com>

Reviewed-by: Pali Rohár <pali.rohar@gmail.com>

Reviewed-by: Christoph Hellwig <hch@lst.de>

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

---

 src/exfat_fs.h  | 519 +++++++++++++++++++++++++++++++++++++++++++

 src/exfat_raw.h | 184 +++++++++++++++

 2 files changed, 703 insertions(+)

 create mode 100644 src/exfat_fs.h

 create mode 100644 src/exfat_raw.h

diff --git a/src/exfat_fs.h b/src/exfat_fs.h

new file mode 100644

index 0000000000000000000000000000000000000000..67d4e46fb81003d0c367862ee986b37c80e7fa4e

--- /dev/null

+++ b/src/exfat_fs.h

@@ -0,0 +1,519 @@

+/* 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 */

diff --git a/src/exfat_raw.h b/src/exfat_raw.h

new file mode 100644

index 0000000000000000000000000000000000000000..2a841010e6490ccafd5d12844a48a93fc6ee4bbf

--- /dev/null

+++ b/src/exfat_raw.h

@@ -0,0 +1,184 @@

+/* 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 */

-- 

2.31.1