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    Subject[PATCH v11 01/14] exfat: add in-memory and on-disk structures and headers
    Date
    From: Namjae Jeon <namjae.jeon@samsung.com>

    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: Christoph Hellwig <hch@lst.de>
    Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
    ---
    fs/exfat/exfat_fs.h | 522 +++++++++++++++++++++++++++++++++++++++++++
    fs/exfat/exfat_raw.h | 184 +++++++++++++++
    2 files changed, 706 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..9ba9744850db
    --- /dev/null
    +++ b/fs/exfat/exfat_fs.h
    @@ -0,0 +1,522 @@
    +/* 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 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;
    + /* 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 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,
    + 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/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
    \
     
     \ /
      Last update: 2020-01-18 16:04    [W:4.521 / U:0.220 seconds]
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