xref: /openbmc/linux/fs/exfat/exfat_fs.h (revision e8254a8e)
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  */
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 =	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		0xFFFF0321
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 
75 #define MAX_CHARSET_SIZE	6 /* max size of multi-byte character */
76 #define MAX_NAME_LENGTH		255 /* max len of file name excluding NULL */
77 #define MAX_VFSNAME_BUF_SIZE	((MAX_NAME_LENGTH + 1) * MAX_CHARSET_SIZE)
78 
79 #define EXFAT_HINT_NONE		-1
80 #define EXFAT_MIN_SUBDIR	2
81 
82 /*
83  * helpers for cluster size to byte conversion.
84  */
85 #define EXFAT_CLU_TO_B(b, sbi)		((b) << (sbi)->cluster_size_bits)
86 #define EXFAT_B_TO_CLU(b, sbi)		((b) >> (sbi)->cluster_size_bits)
87 #define EXFAT_B_TO_CLU_ROUND_UP(b, sbi)	\
88 	(((b - 1) >> (sbi)->cluster_size_bits) + 1)
89 #define EXFAT_CLU_OFFSET(off, sbi)	((off) & ((sbi)->cluster_size - 1))
90 
91 /*
92  * helpers for block size to byte conversion.
93  */
94 #define EXFAT_BLK_TO_B(b, sb)		((b) << (sb)->s_blocksize_bits)
95 #define EXFAT_B_TO_BLK(b, sb)		((b) >> (sb)->s_blocksize_bits)
96 #define EXFAT_B_TO_BLK_ROUND_UP(b, sb)	\
97 	(((b - 1) >> (sb)->s_blocksize_bits) + 1)
98 #define EXFAT_BLK_OFFSET(off, sb)	((off) & ((sb)->s_blocksize - 1))
99 
100 /*
101  * helpers for block size to dentry size conversion.
102  */
103 #define EXFAT_B_TO_DEN(b)		((b) >> DENTRY_SIZE_BITS)
104 #define EXFAT_DEN_TO_B(b)		((b) << DENTRY_SIZE_BITS)
105 
106 /*
107  * helpers for cluster size to dentry size conversion.
108  */
109 #define EXFAT_CLU_TO_DEN(clu, sbi)	\
110 	((clu) << ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS))
111 #define EXFAT_DEN_TO_CLU(dentry, sbi)	\
112 	((dentry) >> ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS))
113 
114 /*
115  * helpers for fat entry.
116  */
117 #define FAT_ENT_SIZE (4)
118 #define FAT_ENT_SIZE_BITS (2)
119 #define FAT_ENT_OFFSET_SECTOR(sb, loc) (EXFAT_SB(sb)->FAT1_start_sector + \
120 	(((u64)loc << FAT_ENT_SIZE_BITS) >> sb->s_blocksize_bits))
121 #define FAT_ENT_OFFSET_BYTE_IN_SECTOR(sb, loc)	\
122 	((loc << FAT_ENT_SIZE_BITS) & (sb->s_blocksize - 1))
123 
124 /*
125  * helpers for bitmap.
126  */
127 #define CLUSTER_TO_BITMAP_ENT(clu) ((clu) - EXFAT_RESERVED_CLUSTERS)
128 #define BITMAP_ENT_TO_CLUSTER(ent) ((ent) + EXFAT_RESERVED_CLUSTERS)
129 #define BITS_PER_SECTOR(sb) ((sb)->s_blocksize * BITS_PER_BYTE)
130 #define BITS_PER_SECTOR_MASK(sb) (BITS_PER_SECTOR(sb) - 1)
131 #define BITMAP_OFFSET_SECTOR_INDEX(sb, ent) \
132 	((ent / BITS_PER_BYTE) >> (sb)->s_blocksize_bits)
133 #define BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent) (ent & BITS_PER_SECTOR_MASK(sb))
134 #define BITMAP_OFFSET_BYTE_IN_SECTOR(sb, ent) \
135 	((ent / BITS_PER_BYTE) & ((sb)->s_blocksize - 1))
136 #define BITS_PER_BYTE_MASK	0x7
137 #define IGNORED_BITS_REMAINED(clu, clu_base) ((1 << ((clu) - (clu_base))) - 1)
138 
139 #define ES_ENTRY_NUM(name_len)	(ES_IDX_LAST_FILENAME(name_len) + 1)
140 /* 19 entries = 1 file entry + 1 stream entry + 17 filename entries */
141 #define ES_MAX_ENTRY_NUM	ES_ENTRY_NUM(MAX_NAME_LENGTH)
142 
143 /*
144  * 19 entries x 32 bytes/entry = 608 bytes.
145  * The 608 bytes are in 3 sectors at most (even 512 Byte sector).
146  */
147 #define DIR_CACHE_SIZE		\
148 	(DIV_ROUND_UP(EXFAT_DEN_TO_B(ES_MAX_ENTRY_NUM), SECTOR_SIZE) + 1)
149 
150 struct exfat_dentry_namebuf {
151 	char *lfn;
152 	int lfnbuf_len; /* usually MAX_UNINAME_BUF_SIZE */
153 };
154 
155 /* unicode name structure */
156 struct exfat_uni_name {
157 	/* +3 for null and for converting */
158 	unsigned short name[MAX_NAME_LENGTH + 3];
159 	u16 name_hash;
160 	unsigned char name_len;
161 };
162 
163 /* directory structure */
164 struct exfat_chain {
165 	unsigned int dir;
166 	unsigned int size;
167 	unsigned char flags;
168 };
169 
170 /* first empty entry hint information */
171 struct exfat_hint_femp {
172 	/* entry index of a directory */
173 	int eidx;
174 	/* count of continuous empty entry */
175 	int count;
176 	/* the cluster that first empty slot exists in */
177 	struct exfat_chain cur;
178 };
179 
180 /* hint structure */
181 struct exfat_hint {
182 	unsigned int clu;
183 	union {
184 		unsigned int off; /* cluster offset */
185 		int eidx; /* entry index */
186 	};
187 };
188 
189 struct exfat_entry_set_cache {
190 	struct super_block *sb;
191 	unsigned int start_off;
192 	int num_bh;
193 	struct buffer_head *__bh[DIR_CACHE_SIZE];
194 	struct buffer_head **bh;
195 	unsigned int num_entries;
196 	bool modified;
197 };
198 
199 #define IS_DYNAMIC_ES(es)	((es)->__bh != (es)->bh)
200 
201 struct exfat_dir_entry {
202 	struct exfat_chain dir;
203 	int entry;
204 	unsigned int type;
205 	unsigned int start_clu;
206 	unsigned char flags;
207 	unsigned short attr;
208 	loff_t size;
209 	unsigned int num_subdirs;
210 	struct timespec64 atime;
211 	struct timespec64 mtime;
212 	struct timespec64 crtime;
213 	struct exfat_dentry_namebuf namebuf;
214 };
215 
216 /*
217  * exfat mount in-memory data
218  */
219 struct exfat_mount_options {
220 	kuid_t fs_uid;
221 	kgid_t fs_gid;
222 	unsigned short fs_fmask;
223 	unsigned short fs_dmask;
224 	/* permission for setting the [am]time */
225 	unsigned short allow_utime;
226 	/* charset for filename input/display */
227 	char *iocharset;
228 	/* on error: continue, panic, remount-ro */
229 	enum exfat_error_mode errors;
230 	unsigned utf8:1, /* Use of UTF-8 character set */
231 		 sys_tz:1, /* Use local timezone */
232 		 discard:1, /* Issue discard requests on deletions */
233 		 keep_last_dots:1; /* Keep trailing periods in paths */
234 	int time_offset; /* Offset of timestamps from UTC (in minutes) */
235 };
236 
237 /*
238  * EXFAT file system superblock in-memory data
239  */
240 struct exfat_sb_info {
241 	unsigned long long num_sectors; /* num of sectors in volume */
242 	unsigned int num_clusters; /* num of clusters in volume */
243 	unsigned int cluster_size; /* cluster size in bytes */
244 	unsigned int cluster_size_bits;
245 	unsigned int sect_per_clus; /* cluster size in sectors */
246 	unsigned int sect_per_clus_bits;
247 	unsigned long long FAT1_start_sector; /* FAT1 start sector */
248 	unsigned long long FAT2_start_sector; /* FAT2 start sector */
249 	unsigned long long data_start_sector; /* data area start sector */
250 	unsigned int num_FAT_sectors; /* num of FAT sectors */
251 	unsigned int root_dir; /* root dir cluster */
252 	unsigned int dentries_per_clu; /* num of dentries per cluster */
253 	unsigned int vol_flags; /* volume flags */
254 	unsigned int vol_flags_persistent; /* volume flags to retain */
255 	struct buffer_head *boot_bh; /* buffer_head of BOOT sector */
256 
257 	unsigned int map_clu; /* allocation bitmap start cluster */
258 	unsigned int map_sectors; /* num of allocation bitmap sectors */
259 	struct buffer_head **vol_amap; /* allocation bitmap */
260 
261 	unsigned short *vol_utbl; /* upcase table */
262 
263 	unsigned int clu_srch_ptr; /* cluster search pointer */
264 	unsigned int used_clusters; /* number of used clusters */
265 
266 	struct mutex s_lock; /* superblock lock */
267 	struct mutex bitmap_lock; /* bitmap lock */
268 	struct exfat_mount_options options;
269 	struct nls_table *nls_io; /* Charset used for input and display */
270 	struct ratelimit_state ratelimit;
271 
272 	spinlock_t inode_hash_lock;
273 	struct hlist_head inode_hashtable[EXFAT_HASH_SIZE];
274 
275 	struct rcu_head rcu;
276 };
277 
278 #define EXFAT_CACHE_VALID	0
279 
280 /*
281  * EXFAT file system inode in-memory data
282  */
283 struct 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 
327 static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb)
328 {
329 	return sb->s_fs_info;
330 }
331 
332 static 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  */
344 static 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. */
357 static 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 */
370 static 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 
381 static 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 
389 static 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 
396 static 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 
403 static 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 
410 static 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 */
417 int exfat_set_volume_dirty(struct super_block *sb);
418 int 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 
423 int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
424 		struct exfat_chain *p_chain, bool sync_bmap);
425 int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain);
426 int exfat_ent_get(struct super_block *sb, unsigned int loc,
427 		unsigned int *content);
428 int exfat_ent_set(struct super_block *sb, unsigned int loc,
429 		unsigned int content);
430 int exfat_count_ext_entries(struct super_block *sb, struct exfat_chain *p_dir,
431 		int entry, struct exfat_dentry *p_entry);
432 int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain,
433 		unsigned int len);
434 int exfat_zeroed_cluster(struct inode *dir, unsigned int clu);
435 int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain,
436 		unsigned int *ret_clu);
437 int exfat_count_num_clusters(struct super_block *sb,
438 		struct exfat_chain *p_chain, unsigned int *ret_count);
439 
440 /* balloc.c */
441 int exfat_load_bitmap(struct super_block *sb);
442 void exfat_free_bitmap(struct exfat_sb_info *sbi);
443 int exfat_set_bitmap(struct inode *inode, unsigned int clu, bool sync);
444 void exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync);
445 unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu);
446 int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count);
447 int exfat_trim_fs(struct inode *inode, struct fstrim_range *range);
448 
449 /* file.c */
450 extern const struct file_operations exfat_file_operations;
451 int __exfat_truncate(struct inode *inode);
452 void exfat_truncate(struct inode *inode);
453 int exfat_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
454 		  struct iattr *attr);
455 int exfat_getattr(struct user_namespace *mnt_userns, const struct path *path,
456 		  struct kstat *stat, unsigned int request_mask,
457 		  unsigned int query_flags);
458 int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
459 long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
460 long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
461 				unsigned long arg);
462 
463 /* namei.c */
464 extern const struct dentry_operations exfat_dentry_ops;
465 extern const struct dentry_operations exfat_utf8_dentry_ops;
466 
467 /* cache.c */
468 int exfat_cache_init(void);
469 void exfat_cache_shutdown(void);
470 void exfat_cache_inval_inode(struct inode *inode);
471 int 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 */
476 extern const struct inode_operations exfat_dir_inode_operations;
477 extern const struct file_operations exfat_dir_operations;
478 unsigned int exfat_get_entry_type(struct exfat_dentry *p_entry);
479 int 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);
482 int exfat_init_ext_entry(struct inode *inode, struct exfat_chain *p_dir,
483 		int entry, int num_entries, struct exfat_uni_name *p_uniname);
484 int exfat_remove_entries(struct inode *inode, struct exfat_chain *p_dir,
485 		int entry, int order, int num_entries);
486 int exfat_update_dir_chksum(struct inode *inode, struct exfat_chain *p_dir,
487 		int entry);
488 void exfat_update_dir_chksum_with_entry_set(struct exfat_entry_set_cache *es);
489 int exfat_calc_num_entries(struct exfat_uni_name *p_uniname);
490 int 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);
493 int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu);
494 struct exfat_dentry *exfat_get_dentry(struct super_block *sb,
495 		struct exfat_chain *p_dir, int entry, struct buffer_head **bh);
496 struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es,
497 		int num);
498 int 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);
501 int exfat_put_dentry_set(struct exfat_entry_set_cache *es, int sync);
502 int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir);
503 
504 /* inode.c */
505 extern const struct inode_operations exfat_file_inode_operations;
506 void exfat_sync_inode(struct inode *inode);
507 struct inode *exfat_build_inode(struct super_block *sb,
508 		struct exfat_dir_entry *info, loff_t i_pos);
509 void exfat_hash_inode(struct inode *inode, loff_t i_pos);
510 void exfat_unhash_inode(struct inode *inode);
511 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos);
512 int __exfat_write_inode(struct inode *inode, int sync);
513 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc);
514 void exfat_evict_inode(struct inode *inode);
515 int exfat_block_truncate_page(struct inode *inode, loff_t from);
516 
517 /* exfat/nls.c */
518 unsigned short exfat_toupper(struct super_block *sb, unsigned short a);
519 int exfat_uniname_ncmp(struct super_block *sb, unsigned short *a,
520 		unsigned short *b, unsigned int len);
521 int exfat_utf16_to_nls(struct super_block *sb,
522 		struct exfat_uni_name *uniname, unsigned char *p_cstring,
523 		int len);
524 int 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);
527 int exfat_create_upcase_table(struct super_block *sb);
528 void exfat_free_upcase_table(struct exfat_sb_info *sbi);
529 
530 /* exfat/misc.c */
531 void __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 
549 void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
550 		u8 tz, __le16 time, __le16 date, u8 time_cs);
551 void exfat_truncate_atime(struct timespec64 *ts);
552 void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
553 		u8 *tz, __le16 *time, __le16 *date, u8 *time_cs);
554 u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type);
555 u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type);
556 void exfat_update_bh(struct buffer_head *bh, int sync);
557 int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync);
558 void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
559 		unsigned int size, unsigned char flags);
560 void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec);
561 
562 #endif /* !_EXFAT_FS_H */
563