/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _FAT_H #define _FAT_H #include <linux/buffer_head.h> #include <linux/nls.h> #include <linux/hash.h> #include <linux/ratelimit.h> #include <linux/msdos_fs.h> #include <linux/fs_context.h> #include <linux/fs_parser.h> /* * vfat shortname flags */ #define VFAT_SFN_DISPLAY_LOWER … #define VFAT_SFN_DISPLAY_WIN95 … #define VFAT_SFN_DISPLAY_WINNT … #define VFAT_SFN_CREATE_WIN95 … #define VFAT_SFN_CREATE_WINNT … #define FAT_ERRORS_CONT … #define FAT_ERRORS_PANIC … #define FAT_ERRORS_RO … #define FAT_NFS_STALE_RW … #define FAT_NFS_NOSTALE_RO … struct fat_mount_options { … }; #define FAT_HASH_BITS … #define FAT_HASH_SIZE … /* * MS-DOS file system in-core superblock data */ struct msdos_sb_info { … }; #define FAT_CACHE_VALID … /* * MS-DOS file system inode data in memory */ struct msdos_inode_info { … }; struct fat_slot_info { … }; static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb) { … } /* * Functions that determine the variant of the FAT file system (i.e., * whether this is FAT12, FAT16 or FAT32. */ static inline bool is_fat12(const struct msdos_sb_info *sbi) { … } static inline bool is_fat16(const struct msdos_sb_info *sbi) { … } static inline bool is_fat32(const struct msdos_sb_info *sbi) { … } /* Maximum number of clusters */ static inline u32 max_fat(struct super_block *sb) { … } static inline struct msdos_inode_info *MSDOS_I(struct inode *inode) { … } /* * If ->i_mode can't hold S_IWUGO (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 fat_mode_can_hold_ro(struct inode *inode) { … } /* Convert attribute bits and a mask to the UNIX mode. */ static inline umode_t fat_make_mode(struct msdos_sb_info *sbi, u8 attrs, umode_t mode) { … } /* Return the FAT attribute byte for this inode */ static inline u8 fat_make_attrs(struct inode *inode) { … } static inline void fat_save_attrs(struct inode *inode, u8 attrs) { … } static inline unsigned char fat_checksum(const __u8 *name) { … } static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus) { … } static inline void fat_get_blknr_offset(struct msdos_sb_info *sbi, loff_t i_pos, sector_t *blknr, int *offset) { … } static inline loff_t fat_i_pos_read(struct msdos_sb_info *sbi, struct inode *inode) { … } static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len) { … } static inline int fat_get_start(const struct msdos_sb_info *sbi, const struct msdos_dir_entry *de) { … } static inline void fat_set_start(struct msdos_dir_entry *de, int cluster) { … } static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len) { … } /* fat/cache.c */ extern void fat_cache_inval_inode(struct inode *inode); extern int fat_get_cluster(struct inode *inode, int cluster, int *fclus, int *dclus); extern int fat_get_mapped_cluster(struct inode *inode, sector_t sector, sector_t last_block, unsigned long *mapped_blocks, sector_t *bmap); extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys, unsigned long *mapped_blocks, int create, bool from_bmap); /* fat/dir.c */ extern const struct file_operations fat_dir_operations; extern int fat_search_long(struct inode *inode, const unsigned char *name, int name_len, struct fat_slot_info *sinfo); extern int fat_dir_empty(struct inode *dir); extern int fat_subdirs(struct inode *dir); extern int fat_scan(struct inode *dir, const unsigned char *name, struct fat_slot_info *sinfo); extern int fat_scan_logstart(struct inode *dir, int i_logstart, struct fat_slot_info *sinfo); extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, struct msdos_dir_entry **de); extern int fat_alloc_new_dir(struct inode *dir, struct timespec64 *ts); extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots, struct fat_slot_info *sinfo); extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo); /* fat/fatent.c */ struct fat_entry { … }; static inline void fatent_init(struct fat_entry *fatent) { … } static inline void fatent_set_entry(struct fat_entry *fatent, int entry) { … } static inline void fatent_brelse(struct fat_entry *fatent) { … } static inline bool fat_valid_entry(struct msdos_sb_info *sbi, int entry) { … } extern void fat_ent_access_init(struct super_block *sb); extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent, int entry); extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent, int new, int wait); extern int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster); extern int fat_free_clusters(struct inode *inode, int cluster); extern int fat_count_free_clusters(struct super_block *sb); extern int fat_trim_fs(struct inode *inode, struct fstrim_range *range); /* fat/file.c */ extern long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg); extern const struct file_operations fat_file_operations; extern const struct inode_operations fat_file_inode_operations; extern int fat_setattr(struct mnt_idmap *idmap, struct dentry *dentry, struct iattr *attr); extern void fat_truncate_blocks(struct inode *inode, loff_t offset); extern int fat_getattr(struct mnt_idmap *idmap, const struct path *path, struct kstat *stat, u32 request_mask, unsigned int flags); extern int fat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); /* fat/inode.c */ extern int fat_block_truncate_page(struct inode *inode, loff_t from); extern void fat_attach(struct inode *inode, loff_t i_pos); extern void fat_detach(struct inode *inode); extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos); extern struct inode *fat_build_inode(struct super_block *sb, struct msdos_dir_entry *de, loff_t i_pos); extern int fat_sync_inode(struct inode *inode); extern int fat_fill_super(struct super_block *sb, struct fs_context *fc, void (*setup)(struct super_block *)); extern int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de); extern int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2); extern const struct fs_parameter_spec fat_param_spec[]; int fat_init_fs_context(struct fs_context *fc, bool is_vfat); void fat_free_fc(struct fs_context *fc); int fat_parse_param(struct fs_context *fc, struct fs_parameter *param, bool is_vfat); int fat_reconfigure(struct fs_context *fc); static inline unsigned long fat_dir_hash(int logstart) { … } extern int fat_add_cluster(struct inode *inode); /* fat/misc.c */ extern __printf(3, 4) __cold void __fat_fs_error(struct super_block *sb, int report, const char *fmt, ...); #define fat_fs_error(sb, fmt, args...) … #define fat_fs_error_ratelimit(sb, fmt, args...) … #define FAT_PRINTK_PREFIX … #define fat_msg(sb, level, fmt, args...) … __printf(3, 4) __cold void _fat_msg(struct super_block *sb, const char *level, const char *fmt, ...); #define fat_msg_ratelimit(sb, level, fmt, args...) … extern int fat_clusters_flush(struct super_block *sb); extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster); extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec64 *ts, __le16 __time, __le16 __date, u8 time_cs); extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec64 *ts, __le16 *time, __le16 *date, u8 *time_cs); extern struct timespec64 fat_truncate_atime(const struct msdos_sb_info *sbi, const struct timespec64 *ts); extern struct timespec64 fat_truncate_mtime(const struct msdos_sb_info *sbi, const struct timespec64 *ts); extern int fat_truncate_time(struct inode *inode, struct timespec64 *now, int flags); extern int fat_update_time(struct inode *inode, int flags); extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs); int fat_cache_init(void); void fat_cache_destroy(void); /* fat/nfs.c */ extern const struct export_operations fat_export_ops; extern const struct export_operations fat_export_ops_nostale; /* helper for printk */ llu; #endif /* !_FAT_H */
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