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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 IGNORED_BITS_REMAINED(clu, clu_base) ((1UL << ((clu) - (clu_base))) - 1)
139
140#define ES_ENTRY_NUM(name_len) (ES_IDX_LAST_FILENAME(name_len) + 1)
141/* 19 entries = 1 file entry + 1 stream entry + 17 filename entries */
142#define ES_MAX_ENTRY_NUM ES_ENTRY_NUM(MAX_NAME_LENGTH)
143
144/*
145 * 19 entries x 32 bytes/entry = 608 bytes.
146 * The 608 bytes are in 3 sectors at most (even 512 Byte sector).
147 */
148#define DIR_CACHE_SIZE \
149 (DIV_ROUND_UP(EXFAT_DEN_TO_B(ES_MAX_ENTRY_NUM), SECTOR_SIZE) + 1)
150
151struct exfat_dentry_namebuf {
152 char *lfn;
153 int lfnbuf_len; /* usually MAX_UNINAME_BUF_SIZE */
154};
155
156/* unicode name structure */
157struct exfat_uni_name {
158 /* +3 for null and for converting */
159 unsigned short name[MAX_NAME_LENGTH + 3];
160 u16 name_hash;
161 unsigned char name_len;
162};
163
164/* directory structure */
165struct exfat_chain {
166 unsigned int dir;
167 unsigned int size;
168 unsigned char flags;
169};
170
171/* first empty entry hint information */
172struct exfat_hint_femp {
173 /* entry index of a directory */
174 int eidx;
175 /* count of continuous empty entry */
176 int count;
177 /* the cluster that first empty slot exists in */
178 struct exfat_chain cur;
179};
180
181/* hint structure */
182struct exfat_hint {
183 unsigned int clu;
184 union {
185 unsigned int off; /* cluster offset */
186 int eidx; /* entry index */
187 };
188};
189
190struct exfat_entry_set_cache {
191 struct super_block *sb;
192 unsigned int start_off;
193 int num_bh;
194 struct buffer_head *__bh[DIR_CACHE_SIZE];
195 struct buffer_head **bh;
196 unsigned int num_entries;
197 bool modified;
198};
199
200#define IS_DYNAMIC_ES(es) ((es)->__bh != (es)->bh)
201
202struct exfat_dir_entry {
203 struct exfat_chain dir;
204 int entry;
205 unsigned int type;
206 unsigned int start_clu;
207 unsigned char flags;
208 unsigned short attr;
209 loff_t size;
210 loff_t valid_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 /* Support creating zero-size directory, default: false */
238 bool zero_size_dir;
239};
240
241/*
242 * EXFAT file system superblock in-memory data
243 */
244struct exfat_sb_info {
245 unsigned long long num_sectors; /* num of sectors in volume */
246 unsigned int num_clusters; /* num of clusters in volume */
247 unsigned int cluster_size; /* cluster size in bytes */
248 unsigned int cluster_size_bits;
249 unsigned int sect_per_clus; /* cluster size in sectors */
250 unsigned int sect_per_clus_bits;
251 unsigned long long FAT1_start_sector; /* FAT1 start sector */
252 unsigned long long FAT2_start_sector; /* FAT2 start sector */
253 unsigned long long data_start_sector; /* data area start sector */
254 unsigned int num_FAT_sectors; /* num of FAT sectors */
255 unsigned int root_dir; /* root dir cluster */
256 unsigned int dentries_per_clu; /* num of dentries per cluster */
257 unsigned int vol_flags; /* volume flags */
258 unsigned int vol_flags_persistent; /* volume flags to retain */
259 struct buffer_head *boot_bh; /* buffer_head of BOOT sector */
260
261 unsigned int map_clu; /* allocation bitmap start cluster */
262 unsigned int map_sectors; /* num of allocation bitmap sectors */
263 struct buffer_head **vol_amap; /* allocation bitmap */
264
265 unsigned short *vol_utbl; /* upcase table */
266
267 unsigned int clu_srch_ptr; /* cluster search pointer */
268 unsigned int used_clusters; /* number of used clusters */
269
270 struct mutex s_lock; /* superblock lock */
271 struct mutex bitmap_lock; /* bitmap lock */
272 struct exfat_mount_options options;
273 struct nls_table *nls_io; /* Charset used for input and display */
274 struct ratelimit_state ratelimit;
275
276 spinlock_t inode_hash_lock;
277 struct hlist_head inode_hashtable[EXFAT_HASH_SIZE];
278 struct rcu_head rcu;
279};
280
281#define EXFAT_CACHE_VALID 0
282
283/*
284 * EXFAT file system inode in-memory data
285 */
286struct exfat_inode_info {
287 struct exfat_chain dir;
288 int entry;
289 unsigned int type;
290 unsigned short attr;
291 unsigned int start_clu;
292 unsigned char flags;
293 /*
294 * the copy of low 32bit of i_version to check
295 * the validation of hint_stat.
296 */
297 unsigned int version;
298
299 /* hint for cluster last accessed */
300 struct exfat_hint hint_bmap;
301 /* hint for entry index we try to lookup next time */
302 struct exfat_hint hint_stat;
303 /* hint for first empty entry */
304 struct exfat_hint_femp hint_femp;
305
306 spinlock_t cache_lru_lock;
307 struct list_head cache_lru;
308 int nr_caches;
309 /* for avoiding the race between alloc and free */
310 unsigned int cache_valid_id;
311
312 /*
313 * NOTE: i_size_ondisk is 64bits, so must hold ->inode_lock to access.
314 * physically allocated size.
315 */
316 loff_t i_size_ondisk;
317 /* block-aligned i_size (used in cont_write_begin) */
318 loff_t i_size_aligned;
319 /* on-disk position of directory entry or 0 */
320 loff_t i_pos;
321 loff_t valid_size;
322 /* hash by i_location */
323 struct hlist_node i_hash_fat;
324 /* protect bmap against truncate */
325 struct rw_semaphore truncate_lock;
326 struct inode vfs_inode;
327 /* File creation time */
328 struct timespec64 i_crtime;
329};
330
331static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb)
332{
333 return sb->s_fs_info;
334}
335
336static inline struct exfat_inode_info *EXFAT_I(struct inode *inode)
337{
338 return container_of(inode, struct exfat_inode_info, vfs_inode);
339}
340
341/*
342 * If ->i_mode can't hold 0222 (i.e. ATTR_RO), we use ->i_attrs to
343 * save ATTR_RO instead of ->i_mode.
344 *
345 * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
346 * bit, it's just used as flag for app.
347 */
348static inline int exfat_mode_can_hold_ro(struct inode *inode)
349{
350 struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
351
352 if (S_ISDIR(inode->i_mode))
353 return 0;
354
355 if ((~sbi->options.fs_fmask) & 0222)
356 return 1;
357 return 0;
358}
359
360/* Convert attribute bits and a mask to the UNIX mode. */
361static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi,
362 unsigned short attr, mode_t mode)
363{
364 if ((attr & EXFAT_ATTR_READONLY) && !(attr & EXFAT_ATTR_SUBDIR))
365 mode &= ~0222;
366
367 if (attr & EXFAT_ATTR_SUBDIR)
368 return (mode & ~sbi->options.fs_dmask) | S_IFDIR;
369
370 return (mode & ~sbi->options.fs_fmask) | S_IFREG;
371}
372
373/* Return the FAT attribute byte for this inode */
374static inline unsigned short exfat_make_attr(struct inode *inode)
375{
376 unsigned short attr = EXFAT_I(inode)->attr;
377
378 if (S_ISDIR(inode->i_mode))
379 attr |= EXFAT_ATTR_SUBDIR;
380 if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222))
381 attr |= EXFAT_ATTR_READONLY;
382 return attr;
383}
384
385static inline void exfat_save_attr(struct inode *inode, unsigned short attr)
386{
387 if (exfat_mode_can_hold_ro(inode))
388 EXFAT_I(inode)->attr = attr & (EXFAT_ATTR_RWMASK | EXFAT_ATTR_READONLY);
389 else
390 EXFAT_I(inode)->attr = attr & EXFAT_ATTR_RWMASK;
391}
392
393static inline bool exfat_is_last_sector_in_cluster(struct exfat_sb_info *sbi,
394 sector_t sec)
395{
396 return ((sec - sbi->data_start_sector + 1) &
397 ((1 << sbi->sect_per_clus_bits) - 1)) == 0;
398}
399
400static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi,
401 unsigned int clus)
402{
403 return ((sector_t)(clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) +
404 sbi->data_start_sector;
405}
406
407static inline unsigned int exfat_sector_to_cluster(struct exfat_sb_info *sbi,
408 sector_t sec)
409{
410 return ((sec - sbi->data_start_sector) >> sbi->sect_per_clus_bits) +
411 EXFAT_RESERVED_CLUSTERS;
412}
413
414static inline bool is_valid_cluster(struct exfat_sb_info *sbi,
415 unsigned int clus)
416{
417 return clus >= EXFAT_FIRST_CLUSTER && clus < sbi->num_clusters;
418}
419
420/* super.c */
421int exfat_set_volume_dirty(struct super_block *sb);
422int exfat_clear_volume_dirty(struct super_block *sb);
423
424/* fatent.c */
425#define exfat_get_next_cluster(sb, pclu) exfat_ent_get(sb, *(pclu), pclu)
426
427int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
428 struct exfat_chain *p_chain, bool sync_bmap);
429int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain);
430int exfat_ent_get(struct super_block *sb, unsigned int loc,
431 unsigned int *content);
432int exfat_ent_set(struct super_block *sb, unsigned int loc,
433 unsigned int content);
434int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir,
435 int entry, struct exfat_dentry *p_entry);
436int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain,
437 unsigned int len);
438int exfat_zeroed_cluster(struct inode *dir, unsigned int clu);
439int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain,
440 unsigned int *ret_clu);
441int exfat_count_num_clusters(struct super_block *sb,
442 struct exfat_chain *p_chain, unsigned int *ret_count);
443
444/* balloc.c */
445int exfat_load_bitmap(struct super_block *sb);
446void exfat_free_bitmap(struct exfat_sb_info *sbi);
447int exfat_set_bitmap(struct inode *inode, unsigned int clu, bool sync);
448void exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync);
449unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu);
450int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count);
451int exfat_trim_fs(struct inode *inode, struct fstrim_range *range);
452
453/* file.c */
454extern const struct file_operations exfat_file_operations;
455int __exfat_truncate(struct inode *inode);
456void exfat_truncate(struct inode *inode);
457int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
458 struct iattr *attr);
459int exfat_getattr(struct mnt_idmap *idmap, const struct path *path,
460 struct kstat *stat, unsigned int request_mask,
461 unsigned int query_flags);
462int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
463long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
464long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
465 unsigned long arg);
466
467/* namei.c */
468extern const struct dentry_operations exfat_dentry_ops;
469extern const struct dentry_operations exfat_utf8_dentry_ops;
470
471/* cache.c */
472int exfat_cache_init(void);
473void exfat_cache_shutdown(void);
474void exfat_cache_inval_inode(struct inode *inode);
475int exfat_get_cluster(struct inode *inode, unsigned int cluster,
476 unsigned int *fclus, unsigned int *dclus,
477 unsigned int *last_dclus, int allow_eof);
478
479/* dir.c */
480extern const struct inode_operations exfat_dir_inode_operations;
481extern const struct file_operations exfat_dir_operations;
482unsigned int exfat_get_entry_type(struct exfat_dentry *p_entry);
483int exfat_init_dir_entry(struct inode *inode, struct exfat_chain *p_dir,
484 int entry, unsigned int type, unsigned int start_clu,
485 unsigned long long size);
486int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
487 int entry, int num_entries, struct exfat_uni_name *p_uniname);
488int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir,
489 int entry, int order, int num_entries);
490int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir,
491 int entry);
492void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es);
493int exfat_calc_num_entries(struct exfat_uni_name *p_uniname);
494int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei,
495 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
496 struct exfat_hint *hint_opt);
497int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu);
498struct exfat_dentry *exfat_get_dentry(struct super_block *sb,
499 struct exfat_chain *p_dir, int entry, struct buffer_head **bh);
500struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es,
501 int num);
502int exfat_get_dentry_set(struct exfat_entry_set_cache *es,
503 struct super_block *sb, struct exfat_chain *p_dir, int entry,
504 unsigned int type);
505int exfat_put_dentry_set(struct exfat_entry_set_cache *es, int sync);
506int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir);
507
508/* inode.c */
509extern const struct inode_operations exfat_file_inode_operations;
510void exfat_sync_inode(struct inode *inode);
511struct inode *exfat_build_inode(struct super_block *sb,
512 struct exfat_dir_entry *info, loff_t i_pos);
513void exfat_hash_inode(struct inode *inode, loff_t i_pos);
514void exfat_unhash_inode(struct inode *inode);
515struct inode *exfat_iget(struct super_block *sb, loff_t i_pos);
516int __exfat_write_inode(struct inode *inode, int sync);
517int exfat_write_inode(struct inode *inode, struct writeback_control *wbc);
518void exfat_evict_inode(struct inode *inode);
519int exfat_block_truncate_page(struct inode *inode, loff_t from);
520
521/* exfat/nls.c */
522unsigned short exfat_toupper(struct super_block *sb, unsigned short a);
523int exfat_uniname_ncmp(struct super_block *sb, unsigned short *a,
524 unsigned short *b, unsigned int len);
525int exfat_utf16_to_nls(struct super_block *sb,
526 struct exfat_uni_name *uniname, unsigned char *p_cstring,
527 int len);
528int exfat_nls_to_utf16(struct super_block *sb,
529 const unsigned char *p_cstring, const int len,
530 struct exfat_uni_name *uniname, int *p_lossy);
531int exfat_create_upcase_table(struct super_block *sb);
532void exfat_free_upcase_table(struct exfat_sb_info *sbi);
533
534/* exfat/misc.c */
535void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)
536 __printf(3, 4) __cold;
537#define exfat_fs_error(sb, fmt, args...) \
538 __exfat_fs_error(sb, 1, fmt, ## args)
539#define exfat_fs_error_ratelimit(sb, fmt, args...) \
540 __exfat_fs_error(sb, __ratelimit(&EXFAT_SB(sb)->ratelimit), \
541 fmt, ## args)
542
543/* expand to pr_*() with prefix */
544#define exfat_err(sb, fmt, ...) \
545 pr_err("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
546#define exfat_warn(sb, fmt, ...) \
547 pr_warn("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
548#define exfat_info(sb, fmt, ...) \
549 pr_info("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
550#define exfat_debug(sb, fmt, ...) \
551 pr_debug("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
552
553void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
554 u8 tz, __le16 time, __le16 date, u8 time_cs);
555void exfat_truncate_atime(struct timespec64 *ts);
556void exfat_truncate_inode_atime(struct inode *inode);
557void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
558 u8 *tz, __le16 *time, __le16 *date, u8 *time_cs);
559u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type);
560u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type);
561void exfat_update_bh(struct buffer_head *bh, int sync);
562int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync);
563void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
564 unsigned int size, unsigned char flags);
565void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec);
566
567#endif /* !_EXFAT_FS_H */