1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. 4 */ 5 6 #ifndef _EXFAT_FS_H 7 #define _EXFAT_FS_H 8 9 #include <linux/fs.h> 10 #include <linux/ratelimit.h> 11 #include <linux/nls.h> 12 13 #define EXFAT_SUPER_MAGIC 0x2011BAB0UL 14 #define EXFAT_ROOT_INO 1 15 16 #define EXFAT_CLUSTERS_UNTRACKED (~0u) 17 18 /* 19 * exfat error flags 20 */ 21 enum exfat_error_mode { 22 EXFAT_ERRORS_CONT, /* ignore error and continue */ 23 EXFAT_ERRORS_PANIC, /* panic on error */ 24 EXFAT_ERRORS_RO, /* remount r/o on error */ 25 }; 26 27 /* 28 * exfat nls lossy flag 29 */ 30 enum { 31 NLS_NAME_NO_LOSSY, /* no lossy */ 32 NLS_NAME_LOSSY, /* just detected incorrect filename(s) */ 33 NLS_NAME_OVERLEN, /* the length is over than its limit */ 34 }; 35 36 #define EXFAT_HASH_BITS 8 37 #define EXFAT_HASH_SIZE (1UL << EXFAT_HASH_BITS) 38 39 /* 40 * Type Definitions 41 */ 42 #define ES_2_ENTRIES 2 43 #define ES_ALL_ENTRIES 0 44 45 #define DIR_DELETED 0xFFFF0321 46 47 /* type values */ 48 #define TYPE_UNUSED 0x0000 49 #define TYPE_DELETED 0x0001 50 #define TYPE_INVALID 0x0002 51 #define TYPE_CRITICAL_PRI 0x0100 52 #define TYPE_BITMAP 0x0101 53 #define TYPE_UPCASE 0x0102 54 #define TYPE_VOLUME 0x0103 55 #define TYPE_DIR 0x0104 56 #define TYPE_FILE 0x011F 57 #define TYPE_CRITICAL_SEC 0x0200 58 #define TYPE_STREAM 0x0201 59 #define TYPE_EXTEND 0x0202 60 #define TYPE_ACL 0x0203 61 #define TYPE_BENIGN_PRI 0x0400 62 #define TYPE_GUID 0x0401 63 #define TYPE_PADDING 0x0402 64 #define TYPE_ACLTAB 0x0403 65 #define TYPE_BENIGN_SEC 0x0800 66 #define TYPE_ALL 0x0FFF 67 68 #define MAX_CHARSET_SIZE 6 /* max size of multi-byte character */ 69 #define MAX_NAME_LENGTH 255 /* max len of file name excluding NULL */ 70 #define MAX_VFSNAME_BUF_SIZE ((MAX_NAME_LENGTH + 1) * MAX_CHARSET_SIZE) 71 72 /* Enough size to hold 256 dentry (even 512 Byte sector) */ 73 #define DIR_CACHE_SIZE (256*sizeof(struct exfat_dentry)/512+1) 74 75 #define EXFAT_HINT_NONE -1 76 #define EXFAT_MIN_SUBDIR 2 77 78 /* 79 * helpers for cluster size to byte conversion. 80 */ 81 #define EXFAT_CLU_TO_B(b, sbi) ((b) << (sbi)->cluster_size_bits) 82 #define EXFAT_B_TO_CLU(b, sbi) ((b) >> (sbi)->cluster_size_bits) 83 #define EXFAT_B_TO_CLU_ROUND_UP(b, sbi) \ 84 (((b - 1) >> (sbi)->cluster_size_bits) + 1) 85 #define EXFAT_CLU_OFFSET(off, sbi) ((off) & ((sbi)->cluster_size - 1)) 86 87 /* 88 * helpers for block size to byte conversion. 89 */ 90 #define EXFAT_BLK_TO_B(b, sb) ((b) << (sb)->s_blocksize_bits) 91 #define EXFAT_B_TO_BLK(b, sb) ((b) >> (sb)->s_blocksize_bits) 92 #define EXFAT_B_TO_BLK_ROUND_UP(b, sb) \ 93 (((b - 1) >> (sb)->s_blocksize_bits) + 1) 94 #define EXFAT_BLK_OFFSET(off, sb) ((off) & ((sb)->s_blocksize - 1)) 95 96 /* 97 * helpers for block size to dentry size conversion. 98 */ 99 #define EXFAT_B_TO_DEN_IDX(b, sbi) \ 100 ((b) << ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS)) 101 #define EXFAT_B_TO_DEN(b) ((b) >> DENTRY_SIZE_BITS) 102 #define EXFAT_DEN_TO_B(b) ((b) << DENTRY_SIZE_BITS) 103 104 /* 105 * helpers for fat entry. 106 */ 107 #define FAT_ENT_SIZE (4) 108 #define FAT_ENT_SIZE_BITS (2) 109 #define FAT_ENT_OFFSET_SECTOR(sb, loc) (EXFAT_SB(sb)->FAT1_start_sector + \ 110 (((u64)loc << FAT_ENT_SIZE_BITS) >> sb->s_blocksize_bits)) 111 #define FAT_ENT_OFFSET_BYTE_IN_SECTOR(sb, loc) \ 112 ((loc << FAT_ENT_SIZE_BITS) & (sb->s_blocksize - 1)) 113 114 /* 115 * helpers for bitmap. 116 */ 117 #define CLUSTER_TO_BITMAP_ENT(clu) ((clu) - EXFAT_RESERVED_CLUSTERS) 118 #define BITMAP_ENT_TO_CLUSTER(ent) ((ent) + EXFAT_RESERVED_CLUSTERS) 119 #define BITS_PER_SECTOR(sb) ((sb)->s_blocksize * BITS_PER_BYTE) 120 #define BITS_PER_SECTOR_MASK(sb) (BITS_PER_SECTOR(sb) - 1) 121 #define BITMAP_OFFSET_SECTOR_INDEX(sb, ent) \ 122 ((ent / BITS_PER_BYTE) >> (sb)->s_blocksize_bits) 123 #define BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent) (ent & BITS_PER_SECTOR_MASK(sb)) 124 #define BITMAP_OFFSET_BYTE_IN_SECTOR(sb, ent) \ 125 ((ent / BITS_PER_BYTE) & ((sb)->s_blocksize - 1)) 126 #define BITS_PER_BYTE_MASK 0x7 127 #define IGNORED_BITS_REMAINED(clu, clu_base) ((1 << ((clu) - (clu_base))) - 1) 128 129 struct exfat_dentry_namebuf { 130 char *lfn; 131 int lfnbuf_len; /* usally MAX_UNINAME_BUF_SIZE */ 132 }; 133 134 /* unicode name structure */ 135 struct exfat_uni_name { 136 /* +3 for null and for converting */ 137 unsigned short name[MAX_NAME_LENGTH + 3]; 138 u16 name_hash; 139 unsigned char name_len; 140 }; 141 142 /* directory structure */ 143 struct exfat_chain { 144 unsigned int dir; 145 unsigned int size; 146 unsigned char flags; 147 }; 148 149 /* first empty entry hint information */ 150 struct exfat_hint_femp { 151 /* entry index of a directory */ 152 int eidx; 153 /* count of continuous empty entry */ 154 int count; 155 /* the cluster that first empty slot exists in */ 156 struct exfat_chain cur; 157 }; 158 159 /* hint structure */ 160 struct exfat_hint { 161 unsigned int clu; 162 union { 163 unsigned int off; /* cluster offset */ 164 int eidx; /* entry index */ 165 }; 166 }; 167 168 struct exfat_entry_set_cache { 169 struct super_block *sb; 170 bool modified; 171 unsigned int start_off; 172 int num_bh; 173 struct buffer_head *bh[DIR_CACHE_SIZE]; 174 unsigned int num_entries; 175 }; 176 177 struct exfat_dir_entry { 178 struct exfat_chain dir; 179 int entry; 180 unsigned int type; 181 unsigned int start_clu; 182 unsigned char flags; 183 unsigned short attr; 184 loff_t size; 185 unsigned int num_subdirs; 186 struct timespec64 atime; 187 struct timespec64 mtime; 188 struct timespec64 crtime; 189 struct exfat_dentry_namebuf namebuf; 190 }; 191 192 /* 193 * exfat mount in-memory data 194 */ 195 struct exfat_mount_options { 196 kuid_t fs_uid; 197 kgid_t fs_gid; 198 unsigned short fs_fmask; 199 unsigned short fs_dmask; 200 /* permission for setting the [am]time */ 201 unsigned short allow_utime; 202 /* charset for filename input/display */ 203 char *iocharset; 204 /* on error: continue, panic, remount-ro */ 205 enum exfat_error_mode errors; 206 unsigned utf8:1, /* Use of UTF-8 character set */ 207 discard:1; /* Issue discard requests on deletions */ 208 int time_offset; /* Offset of timestamps from UTC (in minutes) */ 209 }; 210 211 /* 212 * EXFAT file system superblock in-memory data 213 */ 214 struct exfat_sb_info { 215 unsigned long long num_sectors; /* num of sectors in volume */ 216 unsigned int num_clusters; /* num of clusters in volume */ 217 unsigned int cluster_size; /* cluster size in bytes */ 218 unsigned int cluster_size_bits; 219 unsigned int sect_per_clus; /* cluster size in sectors */ 220 unsigned int sect_per_clus_bits; 221 unsigned long long FAT1_start_sector; /* FAT1 start sector */ 222 unsigned long long FAT2_start_sector; /* FAT2 start sector */ 223 unsigned long long data_start_sector; /* data area start sector */ 224 unsigned int num_FAT_sectors; /* num of FAT sectors */ 225 unsigned int root_dir; /* root dir cluster */ 226 unsigned int dentries_per_clu; /* num of dentries per cluster */ 227 unsigned int vol_flag; /* volume dirty flag */ 228 struct buffer_head *boot_bh; /* buffer_head of BOOT sector */ 229 230 unsigned int map_clu; /* allocation bitmap start cluster */ 231 unsigned int map_sectors; /* num of allocation bitmap sectors */ 232 struct buffer_head **vol_amap; /* allocation bitmap */ 233 234 unsigned short *vol_utbl; /* upcase table */ 235 236 unsigned int clu_srch_ptr; /* cluster search pointer */ 237 unsigned int used_clusters; /* number of used clusters */ 238 239 struct mutex s_lock; /* superblock lock */ 240 struct exfat_mount_options options; 241 struct nls_table *nls_io; /* Charset used for input and display */ 242 struct ratelimit_state ratelimit; 243 244 spinlock_t inode_hash_lock; 245 struct hlist_head inode_hashtable[EXFAT_HASH_SIZE]; 246 247 struct rcu_head rcu; 248 }; 249 250 /* 251 * EXFAT file system inode in-memory data 252 */ 253 struct exfat_inode_info { 254 struct exfat_chain dir; 255 int entry; 256 unsigned int type; 257 unsigned short attr; 258 unsigned int start_clu; 259 unsigned char flags; 260 /* 261 * the copy of low 32bit of i_version to check 262 * the validation of hint_stat. 263 */ 264 unsigned int version; 265 /* file offset or dentry index for readdir */ 266 loff_t rwoffset; 267 268 /* hint for cluster last accessed */ 269 struct exfat_hint hint_bmap; 270 /* hint for entry index we try to lookup next time */ 271 struct exfat_hint hint_stat; 272 /* hint for first empty entry */ 273 struct exfat_hint_femp hint_femp; 274 275 spinlock_t cache_lru_lock; 276 struct list_head cache_lru; 277 int nr_caches; 278 /* for avoiding the race between alloc and free */ 279 unsigned int cache_valid_id; 280 281 /* 282 * NOTE: i_size_ondisk is 64bits, so must hold ->inode_lock to access. 283 * physically allocated size. 284 */ 285 loff_t i_size_ondisk; 286 /* block-aligned i_size (used in cont_write_begin) */ 287 loff_t i_size_aligned; 288 /* on-disk position of directory entry or 0 */ 289 loff_t i_pos; 290 /* hash by i_location */ 291 struct hlist_node i_hash_fat; 292 /* protect bmap against truncate */ 293 struct rw_semaphore truncate_lock; 294 struct inode vfs_inode; 295 /* File creation time */ 296 struct timespec64 i_crtime; 297 }; 298 299 static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb) 300 { 301 return sb->s_fs_info; 302 } 303 304 static inline struct exfat_inode_info *EXFAT_I(struct inode *inode) 305 { 306 return container_of(inode, struct exfat_inode_info, vfs_inode); 307 } 308 309 /* 310 * If ->i_mode can't hold 0222 (i.e. ATTR_RO), we use ->i_attrs to 311 * save ATTR_RO instead of ->i_mode. 312 * 313 * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only 314 * bit, it's just used as flag for app. 315 */ 316 static inline int exfat_mode_can_hold_ro(struct inode *inode) 317 { 318 struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); 319 320 if (S_ISDIR(inode->i_mode)) 321 return 0; 322 323 if ((~sbi->options.fs_fmask) & 0222) 324 return 1; 325 return 0; 326 } 327 328 /* Convert attribute bits and a mask to the UNIX mode. */ 329 static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi, 330 unsigned short attr, mode_t mode) 331 { 332 if ((attr & ATTR_READONLY) && !(attr & ATTR_SUBDIR)) 333 mode &= ~0222; 334 335 if (attr & ATTR_SUBDIR) 336 return (mode & ~sbi->options.fs_dmask) | S_IFDIR; 337 338 return (mode & ~sbi->options.fs_fmask) | S_IFREG; 339 } 340 341 /* Return the FAT attribute byte for this inode */ 342 static inline unsigned short exfat_make_attr(struct inode *inode) 343 { 344 unsigned short attr = EXFAT_I(inode)->attr; 345 346 if (S_ISDIR(inode->i_mode)) 347 attr |= ATTR_SUBDIR; 348 if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222)) 349 attr |= ATTR_READONLY; 350 return attr; 351 } 352 353 static inline void exfat_save_attr(struct inode *inode, unsigned short attr) 354 { 355 if (exfat_mode_can_hold_ro(inode)) 356 EXFAT_I(inode)->attr = attr & (ATTR_RWMASK | ATTR_READONLY); 357 else 358 EXFAT_I(inode)->attr = attr & ATTR_RWMASK; 359 } 360 361 static inline bool exfat_is_last_sector_in_cluster(struct exfat_sb_info *sbi, 362 sector_t sec) 363 { 364 return ((sec - sbi->data_start_sector + 1) & 365 ((1 << sbi->sect_per_clus_bits) - 1)) == 0; 366 } 367 368 static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi, 369 unsigned int clus) 370 { 371 return ((sector_t)(clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) + 372 sbi->data_start_sector; 373 } 374 375 static inline int exfat_sector_to_cluster(struct exfat_sb_info *sbi, 376 sector_t sec) 377 { 378 return ((sec - sbi->data_start_sector) >> sbi->sect_per_clus_bits) + 379 EXFAT_RESERVED_CLUSTERS; 380 } 381 382 /* super.c */ 383 int exfat_set_vol_flags(struct super_block *sb, unsigned short new_flag); 384 385 /* fatent.c */ 386 #define exfat_get_next_cluster(sb, pclu) exfat_ent_get(sb, *(pclu), pclu) 387 388 int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc, 389 struct exfat_chain *p_chain); 390 int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain); 391 int exfat_ent_get(struct super_block *sb, unsigned int loc, 392 unsigned int *content); 393 int exfat_ent_set(struct super_block *sb, unsigned int loc, 394 unsigned int content); 395 int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir, 396 int entry, struct exfat_dentry *p_entry); 397 int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain, 398 unsigned int len); 399 int exfat_zeroed_cluster(struct inode *dir, unsigned int clu); 400 int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain, 401 unsigned int *ret_clu); 402 int exfat_count_num_clusters(struct super_block *sb, 403 struct exfat_chain *p_chain, unsigned int *ret_count); 404 405 /* balloc.c */ 406 int exfat_load_bitmap(struct super_block *sb); 407 void exfat_free_bitmap(struct exfat_sb_info *sbi); 408 int exfat_set_bitmap(struct inode *inode, unsigned int clu); 409 void exfat_clear_bitmap(struct inode *inode, unsigned int clu); 410 unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu); 411 int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count); 412 413 /* file.c */ 414 extern const struct file_operations exfat_file_operations; 415 int __exfat_truncate(struct inode *inode, loff_t new_size); 416 void exfat_truncate(struct inode *inode, loff_t size); 417 int exfat_setattr(struct dentry *dentry, struct iattr *attr); 418 int exfat_getattr(const struct path *path, struct kstat *stat, 419 unsigned int request_mask, unsigned int query_flags); 420 int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 421 422 /* namei.c */ 423 extern const struct dentry_operations exfat_dentry_ops; 424 extern const struct dentry_operations exfat_utf8_dentry_ops; 425 426 /* cache.c */ 427 int exfat_cache_init(void); 428 void exfat_cache_shutdown(void); 429 void exfat_cache_init_inode(struct inode *inode); 430 void exfat_cache_inval_inode(struct inode *inode); 431 int exfat_get_cluster(struct inode *inode, unsigned int cluster, 432 unsigned int *fclus, unsigned int *dclus, 433 unsigned int *last_dclus, int allow_eof); 434 435 /* dir.c */ 436 extern const struct inode_operations exfat_dir_inode_operations; 437 extern const struct file_operations exfat_dir_operations; 438 unsigned int exfat_get_entry_type(struct exfat_dentry *p_entry); 439 int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir, 440 int entry, unsigned int type, unsigned int start_clu, 441 unsigned long long size); 442 int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir, 443 int entry, int num_entries, struct exfat_uni_name *p_uniname); 444 int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir, 445 int entry, int order, int num_entries); 446 int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir, 447 int entry); 448 void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es); 449 int exfat_calc_num_entries(struct exfat_uni_name *p_uniname); 450 int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, 451 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, 452 int num_entries, unsigned int type); 453 int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu); 454 int exfat_find_location(struct super_block *sb, struct exfat_chain *p_dir, 455 int entry, sector_t *sector, int *offset); 456 struct exfat_dentry *exfat_get_dentry(struct super_block *sb, 457 struct exfat_chain *p_dir, int entry, struct buffer_head **bh, 458 sector_t *sector); 459 struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es, 460 int num); 461 struct exfat_entry_set_cache *exfat_get_dentry_set(struct super_block *sb, 462 struct exfat_chain *p_dir, int entry, unsigned int type); 463 void exfat_free_dentry_set(struct exfat_entry_set_cache *es, int sync); 464 int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir); 465 466 /* inode.c */ 467 extern const struct inode_operations exfat_file_inode_operations; 468 void exfat_sync_inode(struct inode *inode); 469 struct inode *exfat_build_inode(struct super_block *sb, 470 struct exfat_dir_entry *info, loff_t i_pos); 471 void exfat_hash_inode(struct inode *inode, loff_t i_pos); 472 void exfat_unhash_inode(struct inode *inode); 473 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos); 474 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc); 475 void exfat_evict_inode(struct inode *inode); 476 int exfat_block_truncate_page(struct inode *inode, loff_t from); 477 478 /* exfat/nls.c */ 479 unsigned short exfat_toupper(struct super_block *sb, unsigned short a); 480 int exfat_uniname_ncmp(struct super_block *sb, unsigned short *a, 481 unsigned short *b, unsigned int len); 482 int exfat_utf16_to_nls(struct super_block *sb, 483 struct exfat_uni_name *uniname, unsigned char *p_cstring, 484 int len); 485 int exfat_nls_to_utf16(struct super_block *sb, 486 const unsigned char *p_cstring, const int len, 487 struct exfat_uni_name *uniname, int *p_lossy); 488 int exfat_create_upcase_table(struct super_block *sb); 489 void exfat_free_upcase_table(struct exfat_sb_info *sbi); 490 491 /* exfat/misc.c */ 492 void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...) 493 __printf(3, 4) __cold; 494 #define exfat_fs_error(sb, fmt, args...) \ 495 __exfat_fs_error(sb, 1, fmt, ## args) 496 #define exfat_fs_error_ratelimit(sb, fmt, args...) \ 497 __exfat_fs_error(sb, __ratelimit(&EXFAT_SB(sb)->ratelimit), \ 498 fmt, ## args) 499 void exfat_msg(struct super_block *sb, const char *lv, const char *fmt, ...) 500 __printf(3, 4) __cold; 501 #define exfat_err(sb, fmt, ...) \ 502 exfat_msg(sb, KERN_ERR, fmt, ##__VA_ARGS__) 503 #define exfat_warn(sb, fmt, ...) \ 504 exfat_msg(sb, KERN_WARNING, fmt, ##__VA_ARGS__) 505 #define exfat_info(sb, fmt, ...) \ 506 exfat_msg(sb, KERN_INFO, fmt, ##__VA_ARGS__) 507 508 void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, 509 u8 tz, __le16 time, __le16 date, u8 time_cs); 510 void exfat_truncate_atime(struct timespec64 *ts); 511 void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, 512 u8 *tz, __le16 *time, __le16 *date, u8 *time_cs); 513 u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type); 514 u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type); 515 void exfat_update_bh(struct buffer_head *bh, int sync); 516 int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync); 517 void exfat_chain_set(struct exfat_chain *ec, unsigned int dir, 518 unsigned int size, unsigned char flags); 519 void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec); 520 521 #endif /* !_EXFAT_FS_H */ 522