| #ifndef _FAT_H |
| #define _FAT_H |
| |
| #include <linux/buffer_head.h> |
| #include <linux/string.h> |
| #include <linux/nls.h> |
| #include <linux/fs.h> |
| #include <linux/mutex.h> |
| #include <linux/ratelimit.h> |
| #include <linux/msdos_fs.h> |
| |
| /* |
| * vfat shortname flags |
| */ |
| #define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */ |
| #define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */ |
| #define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */ |
| #define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */ |
| #define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */ |
| |
| #define FAT_ERRORS_CONT 1 /* ignore error and continue */ |
| #define FAT_ERRORS_PANIC 2 /* panic on error */ |
| #define FAT_ERRORS_RO 3 /* remount r/o on error */ |
| |
| struct fat_mount_options { |
| uid_t fs_uid; |
| gid_t fs_gid; |
| unsigned short fs_fmask; |
| unsigned short fs_dmask; |
| unsigned short codepage; /* Codepage for shortname conversions */ |
| char *iocharset; /* Charset used for filename input/display */ |
| unsigned short shortname; /* flags for shortname display/create rule */ |
| unsigned char name_check; /* r = relaxed, n = normal, s = strict */ |
| unsigned char errors; /* On error: continue, panic, remount-ro */ |
| unsigned short allow_utime;/* permission for setting the [am]time */ |
| unsigned quiet:1, /* set = fake successful chmods and chowns */ |
| showexec:1, /* set = only set x bit for com/exe/bat */ |
| sys_immutable:1, /* set = system files are immutable */ |
| dotsOK:1, /* set = hidden and system files are named '.filename' */ |
| isvfat:1, /* 0=no vfat long filename support, 1=vfat support */ |
| utf8:1, /* Use of UTF-8 character set (Default) */ |
| unicode_xlate:1, /* create escape sequences for unhandled Unicode */ |
| numtail:1, /* Does first alias have a numeric '~1' type tail? */ |
| flush:1, /* write things quickly */ |
| nocase:1, /* Does this need case conversion? 0=need case conversion*/ |
| usefree:1, /* Use free_clusters for FAT32 */ |
| tz_utc:1, /* Filesystem timestamps are in UTC */ |
| rodir:1, /* allow ATTR_RO for directory */ |
| discard:1; /* Issue discard requests on deletions */ |
| }; |
| |
| #define FAT_HASH_BITS 8 |
| #define FAT_HASH_SIZE (1UL << FAT_HASH_BITS) |
| |
| /* |
| * MS-DOS file system in-core superblock data |
| */ |
| struct msdos_sb_info { |
| unsigned short sec_per_clus; /* sectors/cluster */ |
| unsigned short cluster_bits; /* log2(cluster_size) */ |
| unsigned int cluster_size; /* cluster size */ |
| unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */ |
| unsigned short fat_start; |
| unsigned long fat_length; /* FAT start & length (sec.) */ |
| unsigned long dir_start; |
| unsigned short dir_entries; /* root dir start & entries */ |
| unsigned long data_start; /* first data sector */ |
| unsigned long max_cluster; /* maximum cluster number */ |
| unsigned long root_cluster; /* first cluster of the root directory */ |
| unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */ |
| struct mutex fat_lock; |
| unsigned int prev_free; /* previously allocated cluster number */ |
| unsigned int free_clusters; /* -1 if undefined */ |
| unsigned int free_clus_valid; /* is free_clusters valid? */ |
| struct fat_mount_options options; |
| struct nls_table *nls_disk; /* Codepage used on disk */ |
| struct nls_table *nls_io; /* Charset used for input and display */ |
| const void *dir_ops; /* Opaque; default directory operations */ |
| int dir_per_block; /* dir entries per block */ |
| int dir_per_block_bits; /* log2(dir_per_block) */ |
| |
| int fatent_shift; |
| struct fatent_operations *fatent_ops; |
| struct inode *fat_inode; |
| |
| struct ratelimit_state ratelimit; |
| |
| spinlock_t inode_hash_lock; |
| struct hlist_head inode_hashtable[FAT_HASH_SIZE]; |
| }; |
| |
| #define FAT_CACHE_VALID 0 /* special case for valid cache */ |
| |
| /* |
| * MS-DOS file system inode data in memory |
| */ |
| struct msdos_inode_info { |
| spinlock_t cache_lru_lock; |
| struct list_head cache_lru; |
| int nr_caches; |
| /* for avoiding the race between fat_free() and fat_get_cluster() */ |
| unsigned int cache_valid_id; |
| |
| /* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */ |
| loff_t mmu_private; /* physically allocated size */ |
| |
| int i_start; /* first cluster or 0 */ |
| int i_logstart; /* logical first cluster */ |
| int i_attrs; /* unused attribute bits */ |
| loff_t i_pos; /* on-disk position of directory entry or 0 */ |
| struct hlist_node i_fat_hash; /* hash by i_location */ |
| struct inode vfs_inode; |
| }; |
| |
| struct fat_slot_info { |
| loff_t i_pos; /* on-disk position of directory entry */ |
| loff_t slot_off; /* offset for slot or de start */ |
| int nr_slots; /* number of slots + 1(de) in filename */ |
| struct msdos_dir_entry *de; |
| struct buffer_head *bh; |
| }; |
| |
| static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb) |
| { |
| return sb->s_fs_info; |
| } |
| |
| static inline struct msdos_inode_info *MSDOS_I(struct inode *inode) |
| { |
| return container_of(inode, struct msdos_inode_info, vfs_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) |
| { |
| struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
| mode_t mask; |
| |
| if (S_ISDIR(inode->i_mode)) { |
| if (!sbi->options.rodir) |
| return 0; |
| mask = ~sbi->options.fs_dmask; |
| } else |
| mask = ~sbi->options.fs_fmask; |
| |
| if (!(mask & S_IWUGO)) |
| return 0; |
| return 1; |
| } |
| |
| /* Convert attribute bits and a mask to the UNIX mode. */ |
| static inline mode_t fat_make_mode(struct msdos_sb_info *sbi, |
| u8 attrs, mode_t mode) |
| { |
| if (attrs & ATTR_RO && !((attrs & ATTR_DIR) && !sbi->options.rodir)) |
| mode &= ~S_IWUGO; |
| |
| if (attrs & ATTR_DIR) |
| return (mode & ~sbi->options.fs_dmask) | S_IFDIR; |
| else |
| return (mode & ~sbi->options.fs_fmask) | S_IFREG; |
| } |
| |
| /* Return the FAT attribute byte for this inode */ |
| static inline u8 fat_make_attrs(struct inode *inode) |
| { |
| u8 attrs = MSDOS_I(inode)->i_attrs; |
| if (S_ISDIR(inode->i_mode)) |
| attrs |= ATTR_DIR; |
| if (fat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO)) |
| attrs |= ATTR_RO; |
| return attrs; |
| } |
| |
| static inline void fat_save_attrs(struct inode *inode, u8 attrs) |
| { |
| if (fat_mode_can_hold_ro(inode)) |
| MSDOS_I(inode)->i_attrs = attrs & ATTR_UNUSED; |
| else |
| MSDOS_I(inode)->i_attrs = attrs & (ATTR_UNUSED | ATTR_RO); |
| } |
| |
| static inline unsigned char fat_checksum(const __u8 *name) |
| { |
| unsigned char s = name[0]; |
| s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2]; |
| s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4]; |
| s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6]; |
| s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8]; |
| s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10]; |
| return s; |
| } |
| |
| static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus) |
| { |
| return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus |
| + sbi->data_start; |
| } |
| |
| static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len) |
| { |
| #ifdef __BIG_ENDIAN |
| while (len--) { |
| *dst++ = src[0] | (src[1] << 8); |
| src += 2; |
| } |
| #else |
| memcpy(dst, src, len * 2); |
| #endif |
| } |
| |
| static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len) |
| { |
| #ifdef __BIG_ENDIAN |
| while (len--) { |
| dst[0] = *src & 0x00FF; |
| dst[1] = (*src & 0xFF00) >> 8; |
| dst += 2; |
| src++; |
| } |
| #else |
| memcpy(dst, src, len * 2); |
| #endif |
| } |
| |
| /* 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_bmap(struct inode *inode, sector_t sector, sector_t *phys, |
| unsigned long *mapped_blocks, int create); |
| |
| /* 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_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, |
| struct msdos_dir_entry **de, loff_t *i_pos); |
| extern int fat_alloc_new_dir(struct inode *dir, struct timespec *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 { |
| int entry; |
| union { |
| u8 *ent12_p[2]; |
| __le16 *ent16_p; |
| __le32 *ent32_p; |
| } u; |
| int nr_bhs; |
| struct buffer_head *bhs[2]; |
| struct inode *fat_inode; |
| }; |
| |
| static inline void fatent_init(struct fat_entry *fatent) |
| { |
| fatent->nr_bhs = 0; |
| fatent->entry = 0; |
| fatent->u.ent32_p = NULL; |
| fatent->bhs[0] = fatent->bhs[1] = NULL; |
| fatent->fat_inode = NULL; |
| } |
| |
| static inline void fatent_set_entry(struct fat_entry *fatent, int entry) |
| { |
| fatent->entry = entry; |
| fatent->u.ent32_p = NULL; |
| } |
| |
| static inline void fatent_brelse(struct fat_entry *fatent) |
| { |
| int i; |
| fatent->u.ent32_p = NULL; |
| for (i = 0; i < fatent->nr_bhs; i++) |
| brelse(fatent->bhs[i]); |
| fatent->nr_bhs = 0; |
| fatent->bhs[0] = fatent->bhs[1] = NULL; |
| fatent->fat_inode = NULL; |
| } |
| |
| 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); |
| |
| /* 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 dentry * dentry, struct iattr * attr); |
| extern void fat_truncate_blocks(struct inode *inode, loff_t offset); |
| extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| struct kstat *stat); |
| extern int fat_file_fsync(struct file *file, int datasync); |
| |
| /* fat/inode.c */ |
| 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, void *data, int silent, |
| int isvfat, void (*setup)(struct super_block *)); |
| |
| extern int fat_flush_inodes(struct super_block *sb, struct inode *i1, |
| struct inode *i2); |
| /* fat/misc.c */ |
| extern void |
| __fat_fs_error(struct super_block *s, int report, const char *fmt, ...) |
| __attribute__ ((format (printf, 3, 4))) __cold; |
| #define fat_fs_error(s, fmt, args...) \ |
| __fat_fs_error(s, 1, fmt , ## args) |
| #define fat_fs_error_ratelimit(s, fmt, args...) \ |
| __fat_fs_error(s, __ratelimit(&MSDOS_SB(s)->ratelimit), 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 timespec *ts, |
| __le16 __time, __le16 __date, u8 time_cs); |
| extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts, |
| __le16 *time, __le16 *date, u8 *time_cs); |
| extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs); |
| |
| int fat_cache_init(void); |
| void fat_cache_destroy(void); |
| |
| /* helper for printk */ |
| typedef unsigned long long llu; |
| |
| #endif /* !_FAT_H */ |