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#include <linux/blkdev.h> 13 14#define EXFAT_ROOT_INO 1 15 16#define EXFAT_CLUSTERS_UNTRACKED (~0u) 17 18/* 19 * exfat error flags 20 */ 21enum 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 */ 30enum { 31 NLS_NAME_NO_LOSSY = 0, /* no lossy */ 32 NLS_NAME_LOSSY = 1 << 0, /* just detected incorrect filename(s) */ 33 NLS_NAME_OVERLEN = 1 << 1, /* 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 ES_IDX_FILE 0 46#define ES_IDX_STREAM 1 47#define ES_IDX_FIRST_FILENAME 2 48#define EXFAT_FILENAME_ENTRY_NUM(name_len) \ 49 DIV_ROUND_UP(name_len, EXFAT_FILE_NAME_LEN) 50#define ES_IDX_LAST_FILENAME(name_len) \ 51 (ES_IDX_FIRST_FILENAME + EXFAT_FILENAME_ENTRY_NUM(name_len) - 1) 52 53#define DIR_DELETED 0xFFFFFFF7 54 55/* type values */ 56#define TYPE_UNUSED 0x0000 57#define TYPE_DELETED 0x0001 58#define TYPE_INVALID 0x0002 59#define TYPE_CRITICAL_PRI 0x0100 60#define TYPE_BITMAP 0x0101 61#define TYPE_UPCASE 0x0102 62#define TYPE_VOLUME 0x0103 63#define TYPE_DIR 0x0104 64#define TYPE_FILE 0x011F 65#define TYPE_CRITICAL_SEC 0x0200 66#define TYPE_STREAM 0x0201 67#define TYPE_EXTEND 0x0202 68#define TYPE_ACL 0x0203 69#define TYPE_BENIGN_PRI 0x0400 70#define TYPE_GUID 0x0401 71#define TYPE_PADDING 0x0402 72#define TYPE_ACLTAB 0x0403 73#define TYPE_BENIGN_SEC 0x0800 74#define TYPE_VENDOR_EXT 0x0801 75#define TYPE_VENDOR_ALLOC 0x0802 76 77#define MAX_CHARSET_SIZE 6 /* max size of multi-byte character */ 78#define MAX_NAME_LENGTH 255 /* max len of file name excluding NULL */ 79#define MAX_VFSNAME_BUF_SIZE ((MAX_NAME_LENGTH + 1) * MAX_CHARSET_SIZE) 80 81#define EXFAT_HINT_NONE -1 82#define EXFAT_MIN_SUBDIR 2 83 84/* 85 * helpers for cluster size to byte conversion. 86 */ 87#define EXFAT_CLU_TO_B(b, sbi) ((b) << (sbi)->cluster_size_bits) 88#define EXFAT_B_TO_CLU(b, sbi) ((b) >> (sbi)->cluster_size_bits) 89#define EXFAT_B_TO_CLU_ROUND_UP(b, sbi) \ 90 (((b - 1) >> (sbi)->cluster_size_bits) + 1) 91#define EXFAT_CLU_OFFSET(off, sbi) ((off) & ((sbi)->cluster_size - 1)) 92 93/* 94 * helpers for block size to byte conversion. 95 */ 96#define EXFAT_BLK_TO_B(b, sb) ((b) << (sb)->s_blocksize_bits) 97#define EXFAT_B_TO_BLK(b, sb) ((b) >> (sb)->s_blocksize_bits) 98#define EXFAT_B_TO_BLK_ROUND_UP(b, sb) \ 99 (((b - 1) >> (sb)->s_blocksize_bits) + 1) 100#define EXFAT_BLK_OFFSET(off, sb) ((off) & ((sb)->s_blocksize - 1)) 101 102/* 103 * helpers for block size to dentry size conversion. 104 */ 105#define EXFAT_B_TO_DEN(b) ((b) >> DENTRY_SIZE_BITS) 106#define EXFAT_DEN_TO_B(b) ((b) << DENTRY_SIZE_BITS) 107 108/* 109 * helpers for cluster size to dentry size conversion. 110 */ 111#define EXFAT_CLU_TO_DEN(clu, sbi) \ 112 ((clu) << ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS)) 113#define EXFAT_DEN_TO_CLU(dentry, sbi) \ 114 ((dentry) >> ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS)) 115 116/* 117 * helpers for fat entry. 118 */ 119#define FAT_ENT_SIZE (4) 120#define FAT_ENT_SIZE_BITS (2) 121#define FAT_ENT_OFFSET_SECTOR(sb, loc) (EXFAT_SB(sb)->FAT1_start_sector + \ 122 (((u64)loc << FAT_ENT_SIZE_BITS) >> sb->s_blocksize_bits)) 123#define FAT_ENT_OFFSET_BYTE_IN_SECTOR(sb, loc) \ 124 ((loc << FAT_ENT_SIZE_BITS) & (sb->s_blocksize - 1)) 125 126/* 127 * helpers for bitmap. 128 */ 129#define CLUSTER_TO_BITMAP_ENT(clu) ((clu) - EXFAT_RESERVED_CLUSTERS) 130#define BITMAP_ENT_TO_CLUSTER(ent) ((ent) + EXFAT_RESERVED_CLUSTERS) 131#define BITS_PER_SECTOR(sb) ((sb)->s_blocksize * BITS_PER_BYTE) 132#define BITS_PER_SECTOR_MASK(sb) (BITS_PER_SECTOR(sb) - 1) 133#define BITMAP_OFFSET_SECTOR_INDEX(sb, ent) \ 134 ((ent / BITS_PER_BYTE) >> (sb)->s_blocksize_bits) 135#define BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent) (ent & BITS_PER_SECTOR_MASK(sb)) 136#define BITMAP_OFFSET_BYTE_IN_SECTOR(sb, ent) \ 137 ((ent / BITS_PER_BYTE) & ((sb)->s_blocksize - 1)) 138#define BITS_PER_BYTE_MASK 0x7 139#define IGNORED_BITS_REMAINED(clu, clu_base) ((1 << ((clu) - (clu_base))) - 1) 140 141#define ES_ENTRY_NUM(name_len) (ES_IDX_LAST_FILENAME(name_len) + 1) 142/* 19 entries = 1 file entry + 1 stream entry + 17 filename entries */ 143#define ES_MAX_ENTRY_NUM ES_ENTRY_NUM(MAX_NAME_LENGTH) 144 145/* 146 * 19 entries x 32 bytes/entry = 608 bytes. 147 * The 608 bytes are in 3 sectors at most (even 512 Byte sector). 148 */ 149#define DIR_CACHE_SIZE \ 150 (DIV_ROUND_UP(EXFAT_DEN_TO_B(ES_MAX_ENTRY_NUM), SECTOR_SIZE) + 1) 151 152struct exfat_dentry_namebuf { 153 char *lfn; 154 int lfnbuf_len; /* usually MAX_UNINAME_BUF_SIZE */ 155}; 156 157/* unicode name structure */ 158struct exfat_uni_name { 159 /* +3 for null and for converting */ 160 unsigned short name[MAX_NAME_LENGTH + 3]; 161 u16 name_hash; 162 unsigned char name_len; 163}; 164 165/* directory structure */ 166struct exfat_chain { 167 unsigned int dir; 168 unsigned int size; 169 unsigned char flags; 170}; 171 172/* first empty entry hint information */ 173struct exfat_hint_femp { 174 /* entry index of a directory */ 175 int eidx; 176 /* count of continuous empty entry */ 177 int count; 178 /* the cluster that first empty slot exists in */ 179 struct exfat_chain cur; 180}; 181 182/* hint structure */ 183struct exfat_hint { 184 unsigned int clu; 185 union { 186 unsigned int off; /* cluster offset */ 187 int eidx; /* entry index */ 188 }; 189}; 190 191struct exfat_entry_set_cache { 192 struct super_block *sb; 193 unsigned int start_off; 194 int num_bh; 195 struct buffer_head *__bh[DIR_CACHE_SIZE]; 196 struct buffer_head **bh; 197 unsigned int num_entries; 198 bool modified; 199}; 200 201#define IS_DYNAMIC_ES(es) ((es)->__bh != (es)->bh) 202 203struct exfat_dir_entry { 204 struct exfat_chain dir; 205 int entry; 206 unsigned int type; 207 unsigned int start_clu; 208 unsigned char flags; 209 unsigned short attr; 210 loff_t size; 211 unsigned int num_subdirs; 212 struct timespec64 atime; 213 struct timespec64 mtime; 214 struct timespec64 crtime; 215 struct exfat_dentry_namebuf namebuf; 216}; 217 218/* 219 * exfat mount in-memory data 220 */ 221struct exfat_mount_options { 222 kuid_t fs_uid; 223 kgid_t fs_gid; 224 unsigned short fs_fmask; 225 unsigned short fs_dmask; 226 /* permission for setting the [am]time */ 227 unsigned short allow_utime; 228 /* charset for filename input/display */ 229 char *iocharset; 230 /* on error: continue, panic, remount-ro */ 231 enum exfat_error_mode errors; 232 unsigned utf8:1, /* Use of UTF-8 character set */ 233 sys_tz:1, /* Use local timezone */ 234 discard:1, /* Issue discard requests on deletions */ 235 keep_last_dots:1; /* Keep trailing periods in paths */ 236 int time_offset; /* Offset of timestamps from UTC (in minutes) */ 237}; 238 239/* 240 * EXFAT file system superblock in-memory data 241 */ 242struct exfat_sb_info { 243 unsigned long long num_sectors; /* num of sectors in volume */ 244 unsigned int num_clusters; /* num of clusters in volume */ 245 unsigned int cluster_size; /* cluster size in bytes */ 246 unsigned int cluster_size_bits; 247 unsigned int sect_per_clus; /* cluster size in sectors */ 248 unsigned int sect_per_clus_bits; 249 unsigned long long FAT1_start_sector; /* FAT1 start sector */ 250 unsigned long long FAT2_start_sector; /* FAT2 start sector */ 251 unsigned long long data_start_sector; /* data area start sector */ 252 unsigned int num_FAT_sectors; /* num of FAT sectors */ 253 unsigned int root_dir; /* root dir cluster */ 254 unsigned int dentries_per_clu; /* num of dentries per cluster */ 255 unsigned int vol_flags; /* volume flags */ 256 unsigned int vol_flags_persistent; /* volume flags to retain */ 257 struct buffer_head *boot_bh; /* buffer_head of BOOT sector */ 258 259 unsigned int map_clu; /* allocation bitmap start cluster */ 260 unsigned int map_sectors; /* num of allocation bitmap sectors */ 261 struct buffer_head **vol_amap; /* allocation bitmap */ 262 263 unsigned short *vol_utbl; /* upcase table */ 264 265 unsigned int clu_srch_ptr; /* cluster search pointer */ 266 unsigned int used_clusters; /* number of used clusters */ 267 268 struct mutex s_lock; /* superblock lock */ 269 struct mutex bitmap_lock; /* bitmap lock */ 270 struct exfat_mount_options options; 271 struct nls_table *nls_io; /* Charset used for input and display */ 272 struct ratelimit_state ratelimit; 273 274 spinlock_t inode_hash_lock; 275 struct hlist_head inode_hashtable[EXFAT_HASH_SIZE]; 276}; 277 278#define EXFAT_CACHE_VALID 0 279 280/* 281 * EXFAT file system inode in-memory data 282 */ 283struct exfat_inode_info { 284 struct exfat_chain dir; 285 int entry; 286 unsigned int type; 287 unsigned short attr; 288 unsigned int start_clu; 289 unsigned char flags; 290 /* 291 * the copy of low 32bit of i_version to check 292 * the validation of hint_stat. 293 */ 294 unsigned int version; 295 296 /* hint for cluster last accessed */ 297 struct exfat_hint hint_bmap; 298 /* hint for entry index we try to lookup next time */ 299 struct exfat_hint hint_stat; 300 /* hint for first empty entry */ 301 struct exfat_hint_femp hint_femp; 302 303 spinlock_t cache_lru_lock; 304 struct list_head cache_lru; 305 int nr_caches; 306 /* for avoiding the race between alloc and free */ 307 unsigned int cache_valid_id; 308 309 /* 310 * NOTE: i_size_ondisk is 64bits, so must hold ->inode_lock to access. 311 * physically allocated size. 312 */ 313 loff_t i_size_ondisk; 314 /* block-aligned i_size (used in cont_write_begin) */ 315 loff_t i_size_aligned; 316 /* on-disk position of directory entry or 0 */ 317 loff_t i_pos; 318 /* hash by i_location */ 319 struct hlist_node i_hash_fat; 320 /* protect bmap against truncate */ 321 struct rw_semaphore truncate_lock; 322 struct inode vfs_inode; 323 /* File creation time */ 324 struct timespec64 i_crtime; 325}; 326 327static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb) 328{ 329 return sb->s_fs_info; 330} 331 332static inline struct exfat_inode_info *EXFAT_I(struct inode *inode) 333{ 334 return container_of(inode, struct exfat_inode_info, vfs_inode); 335} 336 337/* 338 * If ->i_mode can't hold 0222 (i.e. ATTR_RO), we use ->i_attrs to 339 * save ATTR_RO instead of ->i_mode. 340 * 341 * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only 342 * bit, it's just used as flag for app. 343 */ 344static inline int exfat_mode_can_hold_ro(struct inode *inode) 345{ 346 struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); 347 348 if (S_ISDIR(inode->i_mode)) 349 return 0; 350 351 if ((~sbi->options.fs_fmask) & 0222) 352 return 1; 353 return 0; 354} 355 356/* Convert attribute bits and a mask to the UNIX mode. */ 357static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi, 358 unsigned short attr, mode_t mode) 359{ 360 if ((attr & ATTR_READONLY) && !(attr & ATTR_SUBDIR)) 361 mode &= ~0222; 362 363 if (attr & ATTR_SUBDIR) 364 return (mode & ~sbi->options.fs_dmask) | S_IFDIR; 365 366 return (mode & ~sbi->options.fs_fmask) | S_IFREG; 367} 368 369/* Return the FAT attribute byte for this inode */ 370static inline unsigned short exfat_make_attr(struct inode *inode) 371{ 372 unsigned short attr = EXFAT_I(inode)->attr; 373 374 if (S_ISDIR(inode->i_mode)) 375 attr |= ATTR_SUBDIR; 376 if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222)) 377 attr |= ATTR_READONLY; 378 return attr; 379} 380 381static inline void exfat_save_attr(struct inode *inode, unsigned short attr) 382{ 383 if (exfat_mode_can_hold_ro(inode)) 384 EXFAT_I(inode)->attr = attr & (ATTR_RWMASK | ATTR_READONLY); 385 else 386 EXFAT_I(inode)->attr = attr & ATTR_RWMASK; 387} 388 389static inline bool exfat_is_last_sector_in_cluster(struct exfat_sb_info *sbi, 390 sector_t sec) 391{ 392 return ((sec - sbi->data_start_sector + 1) & 393 ((1 << sbi->sect_per_clus_bits) - 1)) == 0; 394} 395 396static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi, 397 unsigned int clus) 398{ 399 return ((sector_t)(clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) + 400 sbi->data_start_sector; 401} 402 403static inline unsigned int exfat_sector_to_cluster(struct exfat_sb_info *sbi, 404 sector_t sec) 405{ 406 return ((sec - sbi->data_start_sector) >> sbi->sect_per_clus_bits) + 407 EXFAT_RESERVED_CLUSTERS; 408} 409 410static inline bool is_valid_cluster(struct exfat_sb_info *sbi, 411 unsigned int clus) 412{ 413 return clus >= EXFAT_FIRST_CLUSTER && clus < sbi->num_clusters; 414} 415 416/* super.c */ 417int exfat_set_volume_dirty(struct super_block *sb); 418int exfat_clear_volume_dirty(struct super_block *sb); 419 420/* fatent.c */ 421#define exfat_get_next_cluster(sb, pclu) exfat_ent_get(sb, *(pclu), pclu) 422 423int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc, 424 struct exfat_chain *p_chain, bool sync_bmap); 425int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain); 426int exfat_ent_get(struct super_block *sb, unsigned int loc, 427 unsigned int *content); 428int exfat_ent_set(struct super_block *sb, unsigned int loc, 429 unsigned int content); 430int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir, 431 int entry, struct exfat_dentry *p_entry); 432int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain, 433 unsigned int len); 434int exfat_zeroed_cluster(struct inode *dir, unsigned int clu); 435int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain, 436 unsigned int *ret_clu); 437int exfat_count_num_clusters(struct super_block *sb, 438 struct exfat_chain *p_chain, unsigned int *ret_count); 439 440/* balloc.c */ 441int exfat_load_bitmap(struct super_block *sb); 442void exfat_free_bitmap(struct exfat_sb_info *sbi); 443int exfat_set_bitmap(struct inode *inode, unsigned int clu, bool sync); 444void exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync); 445unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu); 446int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count); 447int exfat_trim_fs(struct inode *inode, struct fstrim_range *range); 448 449/* file.c */ 450extern const struct file_operations exfat_file_operations; 451int __exfat_truncate(struct inode *inode); 452void exfat_truncate(struct inode *inode); 453int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 454 struct iattr *attr); 455int exfat_getattr(struct mnt_idmap *idmap, const struct path *path, 456 struct kstat *stat, unsigned int request_mask, 457 unsigned int query_flags); 458int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 459long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg); 460long exfat_compat_ioctl(struct file *filp, unsigned int cmd, 461 unsigned long arg); 462 463/* namei.c */ 464extern const struct dentry_operations exfat_dentry_ops; 465extern const struct dentry_operations exfat_utf8_dentry_ops; 466 467/* cache.c */ 468int exfat_cache_init(void); 469void exfat_cache_shutdown(void); 470void exfat_cache_inval_inode(struct inode *inode); 471int exfat_get_cluster(struct inode *inode, unsigned int cluster, 472 unsigned int *fclus, unsigned int *dclus, 473 unsigned int *last_dclus, int allow_eof); 474 475/* dir.c */ 476extern const struct inode_operations exfat_dir_inode_operations; 477extern const struct file_operations exfat_dir_operations; 478unsigned int exfat_get_entry_type(struct exfat_dentry *p_entry); 479int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir, 480 int entry, unsigned int type, unsigned int start_clu, 481 unsigned long long size); 482int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir, 483 int entry, int num_entries, struct exfat_uni_name *p_uniname); 484int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir, 485 int entry, int order, int num_entries); 486int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir, 487 int entry); 488void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es); 489int exfat_calc_num_entries(struct exfat_uni_name *p_uniname); 490int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, 491 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, 492 struct exfat_hint *hint_opt); 493int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu); 494struct exfat_dentry *exfat_get_dentry(struct super_block *sb, 495 struct exfat_chain *p_dir, int entry, struct buffer_head **bh); 496struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es, 497 int num); 498int exfat_get_dentry_set(struct exfat_entry_set_cache *es, 499 struct super_block *sb, struct exfat_chain *p_dir, int entry, 500 unsigned int type); 501int exfat_put_dentry_set(struct exfat_entry_set_cache *es, int sync); 502int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir); 503 504/* inode.c */ 505extern const struct inode_operations exfat_file_inode_operations; 506void exfat_sync_inode(struct inode *inode); 507struct inode *exfat_build_inode(struct super_block *sb, 508 struct exfat_dir_entry *info, loff_t i_pos); 509void exfat_hash_inode(struct inode *inode, loff_t i_pos); 510void exfat_unhash_inode(struct inode *inode); 511struct inode *exfat_iget(struct super_block *sb, loff_t i_pos); 512int __exfat_write_inode(struct inode *inode, int sync); 513int exfat_write_inode(struct inode *inode, struct writeback_control *wbc); 514void exfat_evict_inode(struct inode *inode); 515int exfat_block_truncate_page(struct inode *inode, loff_t from); 516 517/* exfat/nls.c */ 518unsigned short exfat_toupper(struct super_block *sb, unsigned short a); 519int exfat_uniname_ncmp(struct super_block *sb, unsigned short *a, 520 unsigned short *b, unsigned int len); 521int exfat_utf16_to_nls(struct super_block *sb, 522 struct exfat_uni_name *uniname, unsigned char *p_cstring, 523 int len); 524int exfat_nls_to_utf16(struct super_block *sb, 525 const unsigned char *p_cstring, const int len, 526 struct exfat_uni_name *uniname, int *p_lossy); 527int exfat_create_upcase_table(struct super_block *sb); 528void exfat_free_upcase_table(struct exfat_sb_info *sbi); 529 530/* exfat/misc.c */ 531void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...) 532 __printf(3, 4) __cold; 533#define exfat_fs_error(sb, fmt, args...) \ 534 __exfat_fs_error(sb, 1, fmt, ## args) 535#define exfat_fs_error_ratelimit(sb, fmt, args...) \ 536 __exfat_fs_error(sb, __ratelimit(&EXFAT_SB(sb)->ratelimit), \ 537 fmt, ## args) 538 539/* expand to pr_*() with prefix */ 540#define exfat_err(sb, fmt, ...) \ 541 pr_err("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__) 542#define exfat_warn(sb, fmt, ...) \ 543 pr_warn("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__) 544#define exfat_info(sb, fmt, ...) \ 545 pr_info("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__) 546#define exfat_debug(sb, fmt, ...) \ 547 pr_debug("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__) 548 549void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, 550 u8 tz, __le16 time, __le16 date, u8 time_cs); 551void exfat_truncate_atime(struct timespec64 *ts); 552void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, 553 u8 *tz, __le16 *time, __le16 *date, u8 *time_cs); 554u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type); 555u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type); 556void exfat_update_bh(struct buffer_head *bh, int sync); 557int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync); 558void exfat_chain_set(struct exfat_chain *ec, unsigned int dir, 559 unsigned int size, unsigned char flags); 560void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec); 561 562#endif /* !_EXFAT_FS_H */ 563