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Subject[PATCH v10 01/14] exfat: add in-memory and on-disk structures and headers
Date
This adds in-memory and on-disk structures and headers.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Sungjong Seo <sj1557.seo@samsung.com>
---
fs/exfat/exfat_fs.h | 520 +++++++++++++++++++++++++++++++++++++++++++
fs/exfat/exfat_raw.h | 184 +++++++++++++++
2 files changed, 704 insertions(+)
create mode 100644 fs/exfat/exfat_fs.h
create mode 100644 fs/exfat/exfat_raw.h

diff --git a/fs/exfat/exfat_fs.h b/fs/exfat/exfat_fs.h
new file mode 100644
index 000000000000..8959ad331231
--- /dev/null
+++ b/fs/exfat/exfat_fs.h
@@ -0,0 +1,520 @@
+/* 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 ctime;
+ 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 int vol_type; /* volume FAT type */
+ unsigned int vol_id; /* volume serial number */
+ 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 root_start_sector; /* root dir 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_in_root; /* num of dentries in root dir */
+ 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 super_block *host_sb; /* sb pointer */
+ 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];
+};
+
+/*
+ * 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;
+};
+
+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 super_block *sb);
+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 super_block *sb);
+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,
+ __le16 time, __le16 date, u8 tz);
+void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
+ __le16 *time, __le16 *date, u8 *tz);
+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/fs/exfat/exfat_raw.h b/fs/exfat/exfat_raw.h
new file mode 100644
index 000000000000..2a841010e649
--- /dev/null
+++ b/fs/exfat/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 */
--
2.17.1
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