| | 1 | #ifndef _FAT_H |
| | 2 | #define _FAT_H |
| | 3 | |
| | 4 | #include <linux/buffer_head.h> |
| | 5 | #include <linux/string.h> |
| | 6 | #include <linux/nls.h> |
| | 7 | #include <linux/fs.h> |
| | 8 | #include <linux/hash.h> |
| | 9 | #include <linux/mutex.h> |
| | 10 | #include <linux/ratelimit.h> |
| | 11 | #include <linux/msdos_fs.h> |
| | 12 | |
| | 13 | /* |
| | 14 | * vfat shortname flags |
| | 15 | */ |
| | 16 | #define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */ |
| | 17 | #define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */ |
| | 18 | #define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */ |
| | 19 | #define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */ |
| | 20 | #define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */ |
| | 21 | |
| | 22 | #define FAT_ERRORS_CONT 1 /* ignore error and continue */ |
| | 23 | #define FAT_ERRORS_PANIC 2 /* panic on error */ |
| | 24 | #define FAT_ERRORS_RO 3 /* remount r/o on error */ |
| | 25 | |
| | 26 | struct fat_mount_options { |
| | 27 | kuid_t fs_uid; |
| | 28 | kgid_t fs_gid; |
| | 29 | unsigned short fs_fmask; |
| | 30 | unsigned short fs_dmask; |
| | 31 | unsigned short codepage; /* Codepage for shortname conversions */ |
| | 32 | char *iocharset; /* Charset used for filename input/display */ |
| | 33 | unsigned short shortname; /* flags for shortname display/create rule */ |
| | 34 | unsigned char name_check; /* r = relaxed, n = normal, s = strict */ |
| | 35 | unsigned char errors; /* On error: continue, panic, remount-ro */ |
| | 36 | unsigned short allow_utime;/* permission for setting the [am]time */ |
| | 37 | unsigned quiet:1, /* set = fake successful chmods and chowns */ |
| | 38 | showexec:1, /* set = only set x bit for com/exe/bat */ |
| | 39 | sys_immutable:1, /* set = system files are immutable */ |
| | 40 | dotsOK:1, /* set = hidden and system files are named '.filename' */ |
| | 41 | isvfat:1, /* 0=no vfat long filename support, 1=vfat support */ |
| | 42 | utf8:1, /* Use of UTF-8 character set (Default) */ |
| | 43 | unicode_xlate:1, /* create escape sequences for unhandled Unicode */ |
| | 44 | numtail:1, /* Does first alias have a numeric '~1' type tail? */ |
| | 45 | flush:1, /* write things quickly */ |
| | 46 | nocase:1, /* Does this need case conversion? 0=need case conversion*/ |
| | 47 | usefree:1, /* Use free_clusters for FAT32 */ |
| | 48 | tz_utc:1, /* Filesystem timestamps are in UTC */ |
| | 49 | rodir:1, /* allow ATTR_RO for directory */ |
| | 50 | discard:1, /* Issue discard requests on deletions */ |
| | 51 | nfs:1; /* Do extra work needed for NFS export */ |
| | 52 | }; |
| | 53 | |
| | 54 | #define FAT_HASH_BITS 8 |
| | 55 | #define FAT_HASH_SIZE (1UL << FAT_HASH_BITS) |
| | 56 | |
| | 57 | /* |
| | 58 | * MS-DOS file system in-core superblock data |
| | 59 | */ |
| | 60 | struct msdos_sb_info { |
| | 61 | unsigned short sec_per_clus; /* sectors/cluster */ |
| | 62 | unsigned short cluster_bits; /* log2(cluster_size) */ |
| | 63 | unsigned int cluster_size; /* cluster size */ |
| | 64 | unsigned char fats, fat_bits; /* number of FATs, FAT bits (12 or 16) */ |
| | 65 | unsigned short fat_start; |
| | 66 | unsigned long fat_length; /* FAT start & length (sec.) */ |
| | 67 | unsigned long dir_start; |
| | 68 | unsigned short dir_entries; /* root dir start & entries */ |
| | 69 | unsigned long data_start; /* first data sector */ |
| | 70 | unsigned long max_cluster; /* maximum cluster number */ |
| | 71 | unsigned long root_cluster; /* first cluster of the root directory */ |
| | 72 | unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */ |
| | 73 | struct mutex fat_lock; |
| | 74 | unsigned int prev_free; /* previously allocated cluster number */ |
| | 75 | unsigned int free_clusters; /* -1 if undefined */ |
| | 76 | unsigned int free_clus_valid; /* is free_clusters valid? */ |
| | 77 | struct fat_mount_options options; |
| | 78 | struct nls_table *nls_disk; /* Codepage used on disk */ |
| | 79 | struct nls_table *nls_io; /* Charset used for input and display */ |
| | 80 | const void *dir_ops; /* Opaque; default directory operations */ |
| | 81 | int dir_per_block; /* dir entries per block */ |
| | 82 | int dir_per_block_bits; /* log2(dir_per_block) */ |
| | 83 | |
| | 84 | int fatent_shift; |
| | 85 | struct fatent_operations *fatent_ops; |
| | 86 | struct inode *fat_inode; |
| | 87 | struct inode *fsinfo_inode; |
| | 88 | |
| | 89 | struct ratelimit_state ratelimit; |
| | 90 | |
| | 91 | spinlock_t inode_hash_lock; |
| | 92 | struct hlist_head inode_hashtable[FAT_HASH_SIZE]; |
| | 93 | |
| | 94 | spinlock_t dir_hash_lock; |
| | 95 | struct hlist_head dir_hashtable[FAT_HASH_SIZE]; |
| | 96 | }; |
| | 97 | |
| | 98 | #define FAT_CACHE_VALID 0 /* special case for valid cache */ |
| | 99 | |
| | 100 | /* |
| | 101 | * MS-DOS file system inode data in memory |
| | 102 | */ |
| | 103 | struct msdos_inode_info { |
| | 104 | spinlock_t cache_lru_lock; |
| | 105 | struct list_head cache_lru; |
| | 106 | int nr_caches; |
| | 107 | /* for avoiding the race between fat_free() and fat_get_cluster() */ |
| | 108 | unsigned int cache_valid_id; |
| | 109 | |
| | 110 | /* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */ |
| | 111 | loff_t mmu_private; /* physically allocated size */ |
| | 112 | |
| | 113 | int i_start; /* first cluster or 0 */ |
| | 114 | int i_logstart; /* logical first cluster */ |
| | 115 | int i_attrs; /* unused attribute bits */ |
| | 116 | loff_t i_pos; /* on-disk position of directory entry or 0 */ |
| | 117 | struct hlist_node i_fat_hash; /* hash by i_location */ |
| | 118 | struct hlist_node i_dir_hash; /* hash by i_logstart */ |
| | 119 | struct rw_semaphore truncate_lock; /* protect bmap against truncate */ |
| | 120 | struct inode vfs_inode; |
| | 121 | }; |
| | 122 | |
| | 123 | struct fat_slot_info { |
| | 124 | loff_t i_pos; /* on-disk position of directory entry */ |
| | 125 | loff_t slot_off; /* offset for slot or de start */ |
| | 126 | int nr_slots; /* number of slots + 1(de) in filename */ |
| | 127 | struct msdos_dir_entry *de; |
| | 128 | struct buffer_head *bh; |
| | 129 | }; |
| | 130 | |
| | 131 | static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb) |
| | 132 | { |
| | 133 | return sb->s_fs_info; |
| | 134 | } |
| | 135 | |
| | 136 | static inline struct msdos_inode_info *MSDOS_I(struct inode *inode) |
| | 137 | { |
| | 138 | return container_of(inode, struct msdos_inode_info, vfs_inode); |
| | 139 | } |
| | 140 | |
| | 141 | /* |
| | 142 | * If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to |
| | 143 | * save ATTR_RO instead of ->i_mode. |
| | 144 | * |
| | 145 | * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only |
| | 146 | * bit, it's just used as flag for app. |
| | 147 | */ |
| | 148 | static inline int fat_mode_can_hold_ro(struct inode *inode) |
| | 149 | { |
| | 150 | struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); |
| | 151 | umode_t mask; |
| | 152 | |
| | 153 | if (S_ISDIR(inode->i_mode)) { |
| | 154 | if (!sbi->options.rodir) |
| | 155 | return 0; |
| | 156 | mask = ~sbi->options.fs_dmask; |
| | 157 | } else |
| | 158 | mask = ~sbi->options.fs_fmask; |
| | 159 | |
| | 160 | if (!(mask & S_IWUGO)) |
| | 161 | return 0; |
| | 162 | return 1; |
| | 163 | } |
| | 164 | |
| | 165 | /* Convert attribute bits and a mask to the UNIX mode. */ |
| | 166 | static inline umode_t fat_make_mode(struct msdos_sb_info *sbi, |
| | 167 | u8 attrs, umode_t mode) |
| | 168 | { |
| | 169 | if (attrs & ATTR_RO && !((attrs & ATTR_DIR) && !sbi->options.rodir)) |
| | 170 | mode &= ~S_IWUGO; |
| | 171 | |
| | 172 | if (attrs & ATTR_DIR) |
| | 173 | return (mode & ~sbi->options.fs_dmask) | S_IFDIR; |
| | 174 | else |
| | 175 | return (mode & ~sbi->options.fs_fmask) | S_IFREG; |
| | 176 | } |
| | 177 | |
| | 178 | /* Return the FAT attribute byte for this inode */ |
| | 179 | static inline u8 fat_make_attrs(struct inode *inode) |
| | 180 | { |
| | 181 | u8 attrs = MSDOS_I(inode)->i_attrs; |
| | 182 | if (S_ISDIR(inode->i_mode)) |
| | 183 | attrs |= ATTR_DIR; |
| | 184 | if (fat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO)) |
| | 185 | attrs |= ATTR_RO; |
| | 186 | return attrs; |
| | 187 | } |
| | 188 | |
| | 189 | static inline void fat_save_attrs(struct inode *inode, u8 attrs) |
| | 190 | { |
| | 191 | if (fat_mode_can_hold_ro(inode)) |
| | 192 | MSDOS_I(inode)->i_attrs = attrs & ATTR_UNUSED; |
| | 193 | else |
| | 194 | MSDOS_I(inode)->i_attrs = attrs & (ATTR_UNUSED | ATTR_RO); |
| | 195 | } |
| | 196 | |
| | 197 | static inline unsigned char fat_checksum(const __u8 *name) |
| | 198 | { |
| | 199 | unsigned char s = name[0]; |
| | 200 | s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2]; |
| | 201 | s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4]; |
| | 202 | s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6]; |
| | 203 | s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8]; |
| | 204 | s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10]; |
| | 205 | return s; |
| | 206 | } |
| | 207 | |
| | 208 | static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus) |
| | 209 | { |
| | 210 | return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus |
| | 211 | + sbi->data_start; |
| | 212 | } |
| | 213 | |
| | 214 | static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len) |
| | 215 | { |
| | 216 | #ifdef __BIG_ENDIAN |
| | 217 | while (len--) { |
| | 218 | *dst++ = src[0] | (src[1] << 8); |
| | 219 | src += 2; |
| | 220 | } |
| | 221 | #else |
| | 222 | memcpy(dst, src, len * 2); |
| | 223 | #endif |
| | 224 | } |
| | 225 | |
| | 226 | static inline int fat_get_start(const struct msdos_sb_info *sbi, |
| | 227 | const struct msdos_dir_entry *de) |
| | 228 | { |
| | 229 | int cluster = le16_to_cpu(de->start); |
| | 230 | if (sbi->fat_bits == 32) |
| | 231 | cluster |= (le16_to_cpu(de->starthi) << 16); |
| | 232 | return cluster; |
| | 233 | } |
| | 234 | |
| | 235 | static inline void fat_set_start(struct msdos_dir_entry *de, int cluster) |
| | 236 | { |
| | 237 | de->start = cpu_to_le16(cluster); |
| | 238 | de->starthi = cpu_to_le16(cluster >> 16); |
| | 239 | } |
| | 240 | |
| | 241 | static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len) |
| | 242 | { |
| | 243 | #ifdef __BIG_ENDIAN |
| | 244 | while (len--) { |
| | 245 | dst[0] = *src & 0x00FF; |
| | 246 | dst[1] = (*src & 0xFF00) >> 8; |
| | 247 | dst += 2; |
| | 248 | src++; |
| | 249 | } |
| | 250 | #else |
| | 251 | memcpy(dst, src, len * 2); |
| | 252 | #endif |
| | 253 | } |
| | 254 | |
| | 255 | /* fat/cache.c */ |
| | 256 | extern void fat_cache_inval_inode(struct inode *inode); |
| | 257 | extern int fat_get_cluster(struct inode *inode, int cluster, |
| | 258 | int *fclus, int *dclus); |
| | 259 | extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys, |
| | 260 | unsigned long *mapped_blocks, int create); |
| | 261 | |
| | 262 | /* fat/dir.c */ |
| | 263 | extern const struct file_operations fat_dir_operations; |
| | 264 | extern int fat_search_long(struct inode *inode, const unsigned char *name, |
| | 265 | int name_len, struct fat_slot_info *sinfo); |
| | 266 | extern int fat_dir_empty(struct inode *dir); |
| | 267 | extern int fat_subdirs(struct inode *dir); |
| | 268 | extern int fat_scan(struct inode *dir, const unsigned char *name, |
| | 269 | struct fat_slot_info *sinfo); |
| | 270 | extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, |
| | 271 | struct msdos_dir_entry **de); |
| | 272 | extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts); |
| | 273 | extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots, |
| | 274 | struct fat_slot_info *sinfo); |
| | 275 | extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo); |
| | 276 | |
| | 277 | /* fat/fatent.c */ |
| | 278 | struct fat_entry { |
| | 279 | int entry; |
| | 280 | union { |
| | 281 | u8 *ent12_p[2]; |
| | 282 | __le16 *ent16_p; |
| | 283 | __le32 *ent32_p; |
| | 284 | } u; |
| | 285 | int nr_bhs; |
| | 286 | struct buffer_head *bhs[2]; |
| | 287 | struct inode *fat_inode; |
| | 288 | }; |
| | 289 | |
| | 290 | static inline void fatent_init(struct fat_entry *fatent) |
| | 291 | { |
| | 292 | fatent->nr_bhs = 0; |
| | 293 | fatent->entry = 0; |
| | 294 | fatent->u.ent32_p = NULL; |
| | 295 | fatent->bhs[0] = fatent->bhs[1] = NULL; |
| | 296 | fatent->fat_inode = NULL; |
| | 297 | } |
| | 298 | |
| | 299 | static inline void fatent_set_entry(struct fat_entry *fatent, int entry) |
| | 300 | { |
| | 301 | fatent->entry = entry; |
| | 302 | fatent->u.ent32_p = NULL; |
| | 303 | } |
| | 304 | |
| | 305 | static inline void fatent_brelse(struct fat_entry *fatent) |
| | 306 | { |
| | 307 | int i; |
| | 308 | fatent->u.ent32_p = NULL; |
| | 309 | for (i = 0; i < fatent->nr_bhs; i++) |
| | 310 | brelse(fatent->bhs[i]); |
| | 311 | fatent->nr_bhs = 0; |
| | 312 | fatent->bhs[0] = fatent->bhs[1] = NULL; |
| | 313 | fatent->fat_inode = NULL; |
| | 314 | } |
| | 315 | |
| | 316 | extern void fat_ent_access_init(struct super_block *sb); |
| | 317 | extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent, |
| | 318 | int entry); |
| | 319 | extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent, |
| | 320 | int new, int wait); |
| | 321 | extern int fat_alloc_clusters(struct inode *inode, int *cluster, |
| | 322 | int nr_cluster); |
| | 323 | extern int fat_free_clusters(struct inode *inode, int cluster); |
| | 324 | extern int fat_count_free_clusters(struct super_block *sb); |
| | 325 | |
| | 326 | /* fat/file.c */ |
| | 327 | extern long fat_generic_ioctl(struct file *filp, unsigned int cmd, |
| | 328 | unsigned long arg); |
| | 329 | extern const struct file_operations fat_file_operations; |
| | 330 | extern const struct inode_operations fat_file_inode_operations; |
| | 331 | extern int fat_setattr(struct dentry *dentry, struct iattr *attr); |
| | 332 | extern void fat_truncate_blocks(struct inode *inode, loff_t offset); |
| | 333 | extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| | 334 | struct kstat *stat); |
| | 335 | extern int fat_file_fsync(struct file *file, loff_t start, loff_t end, |
| | 336 | int datasync); |
| | 337 | |
| | 338 | /* fat/inode.c */ |
| | 339 | extern void fat_attach(struct inode *inode, loff_t i_pos); |
| | 340 | extern void fat_detach(struct inode *inode); |
| | 341 | extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos); |
| | 342 | extern struct inode *fat_build_inode(struct super_block *sb, |
| | 343 | struct msdos_dir_entry *de, loff_t i_pos); |
| | 344 | extern int fat_sync_inode(struct inode *inode); |
| | 345 | extern int fat_fill_super(struct super_block *sb, void *data, int silent, |
| | 346 | int isvfat, void (*setup)(struct super_block *)); |
| | 347 | |
| | 348 | extern int fat_flush_inodes(struct super_block *sb, struct inode *i1, |
| | 349 | struct inode *i2); |
| | 350 | static inline unsigned long fat_dir_hash(int logstart) |
| | 351 | { |
| | 352 | return hash_32(logstart, FAT_HASH_BITS); |
| | 353 | } |
| | 354 | |
| | 355 | /* fat/misc.c */ |
| | 356 | extern __printf(3, 4) __cold |
| | 357 | void __fat_fs_error(struct super_block *sb, int report, const char *fmt, ...); |
| | 358 | #define fat_fs_error(sb, fmt, args...) \ |
| | 359 | __fat_fs_error(sb, 1, fmt , ## args) |
| | 360 | #define fat_fs_error_ratelimit(sb, fmt, args...) \ |
| | 361 | __fat_fs_error(sb, __ratelimit(&MSDOS_SB(sb)->ratelimit), fmt , ## args) |
| | 362 | __printf(3, 4) __cold |
| | 363 | void fat_msg(struct super_block *sb, const char *level, const char *fmt, ...); |
| | 364 | #define fat_msg_ratelimit(sb, level, fmt, args...) \ |
| | 365 | do { \ |
| | 366 | if (__ratelimit(&MSDOS_SB(sb)->ratelimit)) \ |
| | 367 | fat_msg(sb, level, fmt, ## args); \ |
| | 368 | } while (0) |
| | 369 | extern int fat_clusters_flush(struct super_block *sb); |
| | 370 | extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster); |
| | 371 | extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts, |
| | 372 | __le16 __time, __le16 __date, u8 time_cs); |
| | 373 | extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts, |
| | 374 | __le16 *time, __le16 *date, u8 *time_cs); |
| | 375 | extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs); |
| | 376 | |
| | 377 | int fat_cache_init(void); |
| | 378 | void fat_cache_destroy(void); |
| | 379 | |
| | 380 | /* fat/nfs.c */ |
| | 381 | struct fid; |
| | 382 | extern struct dentry *fat_fh_to_dentry(struct super_block *sb, struct fid *fid, |
| | 383 | int fh_len, int fh_type); |
| | 384 | extern struct dentry *fat_fh_to_parent(struct super_block *sb, struct fid *fid, |
| | 385 | int fh_len, int fh_type); |
| | 386 | extern struct dentry *fat_get_parent(struct dentry *child_dir); |
| | 387 | |
| | 388 | /* helper for printk */ |
| | 389 | typedef unsigned long long llu; |
| | 390 | |
| | 391 | #endif /* !_FAT_H */ |
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame_incremental