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 #include <uapi/linux/exfat.h>
14
15 #define EXFAT_ROOT_INO 1
16
17 /*
18 * exfat error flags
19 */
20 enum exfat_error_mode {
21 EXFAT_ERRORS_CONT, /* ignore error and continue */
22 EXFAT_ERRORS_PANIC, /* panic on error */
23 EXFAT_ERRORS_RO, /* remount r/o on error */
24 };
25
26 /*
27 * exfat nls lossy flag
28 */
29 enum {
30 NLS_NAME_NO_LOSSY = 0, /* no lossy */
31 NLS_NAME_LOSSY = 1 << 0, /* just detected incorrect filename(s) */
32 NLS_NAME_OVERLEN = 1 << 1, /* the length is over than its limit */
33 };
34
35 #define EXFAT_HASH_BITS 8
36 #define EXFAT_HASH_SIZE (1UL << EXFAT_HASH_BITS)
37
38 /*
39 * Type Definitions
40 */
41 #define ES_2_ENTRIES 2
42 #define ES_ALL_ENTRIES 0
43
44 #define ES_IDX_FILE 0
45 #define ES_IDX_STREAM 1
46 #define ES_IDX_FIRST_FILENAME 2
47 #define EXFAT_FILENAME_ENTRY_NUM(name_len) \
48 DIV_ROUND_UP(name_len, EXFAT_FILE_NAME_LEN)
49 #define ES_IDX_LAST_FILENAME(name_len) \
50 (ES_IDX_FIRST_FILENAME + EXFAT_FILENAME_ENTRY_NUM(name_len) - 1)
51
52 #define DIR_DELETED 0xFFFFFFF7
53
54 /* type values */
55 #define TYPE_UNUSED 0x0000
56 #define TYPE_DELETED 0x0001
57 #define TYPE_INVALID 0x0002
58 #define TYPE_CRITICAL_PRI 0x0100
59 #define TYPE_BITMAP 0x0101
60 #define TYPE_UPCASE 0x0102
61 #define TYPE_VOLUME 0x0103
62 #define TYPE_DIR 0x0104
63 #define TYPE_FILE 0x011F
64 #define TYPE_CRITICAL_SEC 0x0200
65 #define TYPE_STREAM 0x0201
66 #define TYPE_EXTEND 0x0202
67 #define TYPE_ACL 0x0203
68 #define TYPE_BENIGN_PRI 0x0400
69 #define TYPE_GUID 0x0401
70 #define TYPE_PADDING 0x0402
71 #define TYPE_ACLTAB 0x0403
72 #define TYPE_BENIGN_SEC 0x0800
73 #define TYPE_VENDOR_EXT 0x0801
74 #define TYPE_VENDOR_ALLOC 0x0802
75
76 #define MAX_CHARSET_SIZE 6 /* max size of multi-byte character */
77 #define MAX_NAME_LENGTH 255 /* max len of file name excluding NULL */
78 #define MAX_VFSNAME_BUF_SIZE ((MAX_NAME_LENGTH + 1) * MAX_CHARSET_SIZE)
79
80 #define EXFAT_HINT_NONE -1
81 #define EXFAT_MIN_SUBDIR 2
82
83 /*
84 * helpers for cluster size to byte conversion.
85 */
86 #define EXFAT_CLU_TO_B(b, sbi) ((b) << (sbi)->cluster_size_bits)
87 #define EXFAT_B_TO_CLU(b, sbi) ((b) >> (sbi)->cluster_size_bits)
88 #define EXFAT_B_TO_CLU_ROUND_UP(b, sbi) \
89 (((b - 1) >> (sbi)->cluster_size_bits) + 1)
90 #define EXFAT_CLU_OFFSET(off, sbi) ((off) & ((sbi)->cluster_size - 1))
91
92 /*
93 * helpers for block size to byte conversion.
94 */
95 #define EXFAT_BLK_TO_B(b, sb) ((b) << (sb)->s_blocksize_bits)
96 #define EXFAT_B_TO_BLK(b, sb) ((b) >> (sb)->s_blocksize_bits)
97 #define EXFAT_B_TO_BLK_ROUND_UP(b, sb) \
98 (((b - 1) >> (sb)->s_blocksize_bits) + 1)
99 #define EXFAT_BLK_OFFSET(off, sb) ((off) & ((sb)->s_blocksize - 1))
100
101 /*
102 * helpers for block size to dentry size conversion.
103 */
104 #define EXFAT_B_TO_DEN(b) ((b) >> DENTRY_SIZE_BITS)
105 #define EXFAT_DEN_TO_B(b) ((b) << DENTRY_SIZE_BITS)
106
107 /*
108 * helpers for cluster size to dentry size conversion.
109 */
110 #define EXFAT_CLU_TO_DEN(clu, sbi) \
111 ((clu) << ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS))
112 #define EXFAT_DEN_TO_CLU(dentry, sbi) \
113 ((dentry) >> ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS))
114
115 /*
116 * helpers for fat entry.
117 */
118 #define FAT_ENT_SIZE (4)
119 #define FAT_ENT_SIZE_BITS (2)
120 #define FAT_ENT_OFFSET_SECTOR(sb, loc) (EXFAT_SB(sb)->FAT1_start_sector + \
121 (((u64)loc << FAT_ENT_SIZE_BITS) >> sb->s_blocksize_bits))
122 #define FAT_ENT_OFFSET_BYTE_IN_SECTOR(sb, loc) \
123 ((loc << FAT_ENT_SIZE_BITS) & (sb->s_blocksize - 1))
124
125 /*
126 * helpers for bitmap.
127 */
128 #define CLUSTER_TO_BITMAP_ENT(clu) ((clu) - EXFAT_RESERVED_CLUSTERS)
129 #define BITMAP_ENT_TO_CLUSTER(ent) ((ent) + EXFAT_RESERVED_CLUSTERS)
130 #define BITS_PER_SECTOR(sb) ((sb)->s_blocksize * BITS_PER_BYTE)
131 #define BITS_PER_SECTOR_MASK(sb) (BITS_PER_SECTOR(sb) - 1)
132 #define BITMAP_OFFSET_SECTOR_INDEX(sb, ent) \
133 ((ent / BITS_PER_BYTE) >> (sb)->s_blocksize_bits)
134 #define BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent) (ent & BITS_PER_SECTOR_MASK(sb))
135 #define BITMAP_OFFSET_BYTE_IN_SECTOR(sb, ent) \
136 ((ent / BITS_PER_BYTE) & ((sb)->s_blocksize - 1))
137 #define IGNORED_BITS_REMAINED(clu, clu_base) ((1UL << ((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 /* Superblock flags */
151 #define EXFAT_FLAGS_SHUTDOWN 1
152
153 struct exfat_dentry_namebuf {
154 char *lfn;
155 int lfnbuf_len; /* usually MAX_UNINAME_BUF_SIZE */
156 };
157
158 /* unicode name structure */
159 struct exfat_uni_name {
160 /* +3 for null and for converting */
161 unsigned short name[MAX_NAME_LENGTH + 3];
162 u16 name_hash;
163 unsigned char name_len;
164 };
165
166 /* directory structure */
167 struct exfat_chain {
168 unsigned int dir;
169 unsigned int size;
170 unsigned char flags;
171 };
172
173 /* first empty entry hint information */
174 struct exfat_hint_femp {
175 /* entry index of a directory */
176 int eidx;
177 /* count of continuous empty entry */
178 int count;
179 /* the cluster that first empty slot exists in */
180 struct exfat_chain cur;
181 };
182
183 /* hint structure */
184 struct exfat_hint {
185 unsigned int clu;
186 union {
187 unsigned int off; /* cluster offset */
188 int eidx; /* entry index */
189 };
190 };
191
192 struct exfat_entry_set_cache {
193 struct super_block *sb;
194 unsigned int start_off;
195 int num_bh;
196 struct buffer_head *__bh[DIR_CACHE_SIZE];
197 struct buffer_head **bh;
198 unsigned int num_entries;
199 bool modified;
200 };
201
202 #define IS_DYNAMIC_ES(es) ((es)->__bh != (es)->bh)
203
204 struct exfat_dir_entry {
205 /* the cluster where file dentry is located */
206 struct exfat_chain dir;
207 /* the index of file dentry in ->dir */
208 int entry;
209 unsigned int type;
210 unsigned int start_clu;
211 unsigned char flags;
212 unsigned short attr;
213 loff_t size;
214 loff_t valid_size;
215 unsigned int num_subdirs;
216 struct timespec64 atime;
217 struct timespec64 mtime;
218 struct timespec64 crtime;
219 struct exfat_dentry_namebuf namebuf;
220 };
221
222 /*
223 * exfat mount in-memory data
224 */
225 struct exfat_mount_options {
226 kuid_t fs_uid;
227 kgid_t fs_gid;
228 unsigned short fs_fmask;
229 unsigned short fs_dmask;
230 /* permission for setting the [am]time */
231 unsigned short allow_utime;
232 /* charset for filename input/display */
233 char *iocharset;
234 /* on error: continue, panic, remount-ro */
235 enum exfat_error_mode errors;
236 unsigned utf8:1, /* Use of UTF-8 character set */
237 sys_tz:1, /* Use local timezone */
238 discard:1, /* Issue discard requests on deletions */
239 keep_last_dots:1; /* Keep trailing periods in paths */
240 int time_offset; /* Offset of timestamps from UTC (in minutes) */
241 /* Support creating zero-size directory, default: false */
242 bool zero_size_dir;
243 };
244
245 /*
246 * EXFAT file system superblock in-memory data
247 */
248 struct exfat_sb_info {
249 unsigned long long num_sectors; /* num of sectors in volume */
250 unsigned int num_clusters; /* num of clusters in volume */
251 unsigned int cluster_size; /* cluster size in bytes */
252 unsigned int cluster_size_bits;
253 unsigned int sect_per_clus; /* cluster size in sectors */
254 unsigned int sect_per_clus_bits;
255 unsigned long long FAT1_start_sector; /* FAT1 start sector */
256 unsigned long long FAT2_start_sector; /* FAT2 start sector */
257 unsigned long long data_start_sector; /* data area start sector */
258 unsigned int num_FAT_sectors; /* num of FAT sectors */
259 unsigned int root_dir; /* root dir cluster */
260 unsigned int dentries_per_clu; /* num of dentries per cluster */
261 unsigned int vol_flags; /* volume flags */
262 unsigned int vol_flags_persistent; /* volume flags to retain */
263 struct buffer_head *boot_bh; /* buffer_head of BOOT sector */
264
265 unsigned int map_clu; /* allocation bitmap start cluster */
266 unsigned int map_sectors; /* num of allocation bitmap sectors */
267 struct buffer_head **vol_amap; /* allocation bitmap */
268
269 unsigned short *vol_utbl; /* upcase table */
270
271 unsigned int clu_srch_ptr; /* cluster search pointer */
272 unsigned int used_clusters; /* number of used clusters */
273
274 unsigned long s_exfat_flags; /* Exfat superblock flags */
275
276 struct mutex s_lock; /* superblock lock */
277 struct mutex bitmap_lock; /* bitmap lock */
278 struct exfat_mount_options options;
279 struct nls_table *nls_io; /* Charset used for input and display */
280 struct ratelimit_state ratelimit;
281
282 spinlock_t inode_hash_lock;
283 struct hlist_head inode_hashtable[EXFAT_HASH_SIZE];
284 struct rcu_head rcu;
285 };
286
287 #define EXFAT_CACHE_VALID 0
288
289 /*
290 * EXFAT file system inode in-memory data
291 */
292 struct exfat_inode_info {
293 /* the cluster where file dentry is located */
294 struct exfat_chain dir;
295 /* the index of file dentry in ->dir */
296 int entry;
297 unsigned int type;
298 unsigned short attr;
299 unsigned int start_clu;
300 unsigned char flags;
301 /*
302 * the copy of low 32bit of i_version to check
303 * the validation of hint_stat.
304 */
305 unsigned int version;
306
307 /* hint for cluster last accessed */
308 struct exfat_hint hint_bmap;
309 /* hint for entry index we try to lookup next time */
310 struct exfat_hint hint_stat;
311 /* hint for first empty entry */
312 struct exfat_hint_femp hint_femp;
313
314 spinlock_t cache_lru_lock;
315 struct list_head cache_lru;
316 int nr_caches;
317 /* for avoiding the race between alloc and free */
318 unsigned int cache_valid_id;
319
320 /* on-disk position of directory entry or 0 */
321 loff_t i_pos;
322 loff_t valid_size;
323 /* hash by i_location */
324 struct hlist_node i_hash_fat;
325 /* protect bmap against truncate */
326 struct rw_semaphore truncate_lock;
327 struct inode vfs_inode;
328 /* File creation time */
329 struct timespec64 i_crtime;
330 };
331
EXFAT_SB(struct super_block * sb)332 static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb)
333 {
334 return sb->s_fs_info;
335 }
336
EXFAT_I(struct inode * inode)337 static inline struct exfat_inode_info *EXFAT_I(struct inode *inode)
338 {
339 return container_of(inode, struct exfat_inode_info, vfs_inode);
340 }
341
exfat_forced_shutdown(struct super_block * sb)342 static inline int exfat_forced_shutdown(struct super_block *sb)
343 {
344 return test_bit(EXFAT_FLAGS_SHUTDOWN, &EXFAT_SB(sb)->s_exfat_flags);
345 }
346
347 /*
348 * If ->i_mode can't hold 0222 (i.e. ATTR_RO), we use ->i_attrs to
349 * save ATTR_RO instead of ->i_mode.
350 *
351 * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
352 * bit, it's just used as flag for app.
353 */
exfat_mode_can_hold_ro(struct inode * inode)354 static inline int exfat_mode_can_hold_ro(struct inode *inode)
355 {
356 struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
357
358 if (S_ISDIR(inode->i_mode))
359 return 0;
360
361 if ((~sbi->options.fs_fmask) & 0222)
362 return 1;
363 return 0;
364 }
365
366 /* Convert attribute bits and a mask to the UNIX mode. */
exfat_make_mode(struct exfat_sb_info * sbi,unsigned short attr,mode_t mode)367 static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi,
368 unsigned short attr, mode_t mode)
369 {
370 if ((attr & EXFAT_ATTR_READONLY) && !(attr & EXFAT_ATTR_SUBDIR))
371 mode &= ~0222;
372
373 if (attr & EXFAT_ATTR_SUBDIR)
374 return (mode & ~sbi->options.fs_dmask) | S_IFDIR;
375
376 return (mode & ~sbi->options.fs_fmask) | S_IFREG;
377 }
378
379 /* Return the FAT attribute byte for this inode */
exfat_make_attr(struct inode * inode)380 static inline unsigned short exfat_make_attr(struct inode *inode)
381 {
382 unsigned short attr = EXFAT_I(inode)->attr;
383
384 if (S_ISDIR(inode->i_mode))
385 attr |= EXFAT_ATTR_SUBDIR;
386 if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222))
387 attr |= EXFAT_ATTR_READONLY;
388 return attr;
389 }
390
exfat_save_attr(struct inode * inode,unsigned short attr)391 static inline void exfat_save_attr(struct inode *inode, unsigned short attr)
392 {
393 if (exfat_mode_can_hold_ro(inode))
394 EXFAT_I(inode)->attr = attr & (EXFAT_ATTR_RWMASK | EXFAT_ATTR_READONLY);
395 else
396 EXFAT_I(inode)->attr = attr & EXFAT_ATTR_RWMASK;
397 }
398
exfat_is_last_sector_in_cluster(struct exfat_sb_info * sbi,sector_t sec)399 static inline bool exfat_is_last_sector_in_cluster(struct exfat_sb_info *sbi,
400 sector_t sec)
401 {
402 return ((sec - sbi->data_start_sector + 1) &
403 ((1 << sbi->sect_per_clus_bits) - 1)) == 0;
404 }
405
exfat_cluster_to_sector(struct exfat_sb_info * sbi,unsigned int clus)406 static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi,
407 unsigned int clus)
408 {
409 return ((sector_t)(clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) +
410 sbi->data_start_sector;
411 }
412
exfat_sector_to_cluster(struct exfat_sb_info * sbi,sector_t sec)413 static inline unsigned int exfat_sector_to_cluster(struct exfat_sb_info *sbi,
414 sector_t sec)
415 {
416 return ((sec - sbi->data_start_sector) >> sbi->sect_per_clus_bits) +
417 EXFAT_RESERVED_CLUSTERS;
418 }
419
is_valid_cluster(struct exfat_sb_info * sbi,unsigned int clus)420 static inline bool is_valid_cluster(struct exfat_sb_info *sbi,
421 unsigned int clus)
422 {
423 return clus >= EXFAT_FIRST_CLUSTER && clus < sbi->num_clusters;
424 }
425
exfat_ondisk_size(const struct inode * inode)426 static inline loff_t exfat_ondisk_size(const struct inode *inode)
427 {
428 return ((loff_t)inode->i_blocks) << 9;
429 }
430
431 /* super.c */
432 int exfat_set_volume_dirty(struct super_block *sb);
433 int exfat_clear_volume_dirty(struct super_block *sb);
434
435 /* fatent.c */
436 #define exfat_get_next_cluster(sb, pclu) exfat_ent_get(sb, *(pclu), pclu)
437
438 int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
439 struct exfat_chain *p_chain, bool sync_bmap);
440 int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain);
441 int exfat_ent_get(struct super_block *sb, unsigned int loc,
442 unsigned int *content);
443 int exfat_ent_set(struct super_block *sb, unsigned int loc,
444 unsigned int content);
445 int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain,
446 unsigned int len);
447 int exfat_zeroed_cluster(struct inode *dir, unsigned int clu);
448 int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain,
449 unsigned int *ret_clu);
450 int exfat_count_num_clusters(struct super_block *sb,
451 struct exfat_chain *p_chain, unsigned int *ret_count);
452
453 /* balloc.c */
454 int exfat_load_bitmap(struct super_block *sb);
455 void exfat_free_bitmap(struct exfat_sb_info *sbi);
456 int exfat_set_bitmap(struct inode *inode, unsigned int clu, bool sync);
457 int exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync);
458 unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu);
459 int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count);
460 int exfat_trim_fs(struct inode *inode, struct fstrim_range *range);
461
462 /* file.c */
463 extern const struct file_operations exfat_file_operations;
464 int __exfat_truncate(struct inode *inode);
465 void exfat_truncate(struct inode *inode);
466 int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
467 struct iattr *attr);
468 int exfat_getattr(struct mnt_idmap *idmap, const struct path *path,
469 struct kstat *stat, unsigned int request_mask,
470 unsigned int query_flags);
471 int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
472 long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
473 long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
474 unsigned long arg);
475 int exfat_force_shutdown(struct super_block *sb, u32 flags);
476
477 /* namei.c */
478 extern const struct dentry_operations exfat_dentry_ops;
479 extern const struct dentry_operations exfat_utf8_dentry_ops;
480
481 /* cache.c */
482 int exfat_cache_init(void);
483 void exfat_cache_shutdown(void);
484 void exfat_cache_inval_inode(struct inode *inode);
485 int exfat_get_cluster(struct inode *inode, unsigned int cluster,
486 unsigned int *fclus, unsigned int *dclus,
487 unsigned int *last_dclus, int allow_eof);
488
489 /* dir.c */
490 extern const struct inode_operations exfat_dir_inode_operations;
491 extern const struct file_operations exfat_dir_operations;
492 unsigned int exfat_get_entry_type(struct exfat_dentry *p_entry);
493 void exfat_init_dir_entry(struct exfat_entry_set_cache *es,
494 unsigned int type, unsigned int start_clu,
495 unsigned long long size, struct timespec64 *ts);
496 void exfat_init_ext_entry(struct exfat_entry_set_cache *es, int num_entries,
497 struct exfat_uni_name *p_uniname);
498 void exfat_remove_entries(struct inode *inode, struct exfat_entry_set_cache *es,
499 int order);
500 void exfat_update_dir_chksum(struct exfat_entry_set_cache *es);
501 int exfat_calc_num_entries(struct exfat_uni_name *p_uniname);
502 int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei,
503 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
504 struct exfat_hint *hint_opt);
505 int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu);
506 struct exfat_dentry *exfat_get_dentry(struct super_block *sb,
507 struct exfat_chain *p_dir, int entry, struct buffer_head **bh);
508 struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es,
509 int num);
510 int exfat_get_dentry_set(struct exfat_entry_set_cache *es,
511 struct super_block *sb, struct exfat_chain *p_dir, int entry,
512 unsigned int num_entries);
513 #define exfat_get_dentry_set_by_ei(es, sb, ei) \
514 exfat_get_dentry_set(es, sb, &(ei)->dir, (ei)->entry, ES_ALL_ENTRIES)
515 int exfat_get_empty_dentry_set(struct exfat_entry_set_cache *es,
516 struct super_block *sb, struct exfat_chain *p_dir, int entry,
517 unsigned int num_entries);
518 int exfat_put_dentry_set(struct exfat_entry_set_cache *es, int sync);
519 int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir);
520
521 /* inode.c */
522 extern const struct inode_operations exfat_file_inode_operations;
523 void exfat_sync_inode(struct inode *inode);
524 struct inode *exfat_build_inode(struct super_block *sb,
525 struct exfat_dir_entry *info, loff_t i_pos);
526 void exfat_hash_inode(struct inode *inode, loff_t i_pos);
527 void exfat_unhash_inode(struct inode *inode);
528 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos);
529 int __exfat_write_inode(struct inode *inode, int sync);
530 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc);
531 void exfat_evict_inode(struct inode *inode);
532 int exfat_block_truncate_page(struct inode *inode, loff_t from);
533
534 /* exfat/nls.c */
535 unsigned short exfat_toupper(struct super_block *sb, unsigned short a);
536 int exfat_uniname_ncmp(struct super_block *sb, unsigned short *a,
537 unsigned short *b, unsigned int len);
538 int exfat_utf16_to_nls(struct super_block *sb,
539 struct exfat_uni_name *uniname, unsigned char *p_cstring,
540 int len);
541 int exfat_nls_to_utf16(struct super_block *sb,
542 const unsigned char *p_cstring, const int len,
543 struct exfat_uni_name *uniname, int *p_lossy);
544 int exfat_create_upcase_table(struct super_block *sb);
545 void exfat_free_upcase_table(struct exfat_sb_info *sbi);
546
547 /* exfat/misc.c */
548 void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)
549 __printf(3, 4) __cold;
550 #define exfat_fs_error(sb, fmt, args...) \
551 __exfat_fs_error(sb, 1, fmt, ## args)
552 #define exfat_fs_error_ratelimit(sb, fmt, args...) \
553 __exfat_fs_error(sb, __ratelimit(&EXFAT_SB(sb)->ratelimit), \
554 fmt, ## args)
555
556 /* expand to pr_*() with prefix */
557 #define exfat_err(sb, fmt, ...) \
558 pr_err("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
559 #define exfat_warn(sb, fmt, ...) \
560 pr_warn("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
561 #define exfat_info(sb, fmt, ...) \
562 pr_info("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
563 #define exfat_debug(sb, fmt, ...) \
564 pr_debug("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
565
566 void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
567 u8 tz, __le16 time, __le16 date, u8 time_cs);
568 void exfat_truncate_atime(struct timespec64 *ts);
569 void exfat_truncate_inode_atime(struct inode *inode);
570 void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
571 u8 *tz, __le16 *time, __le16 *date, u8 *time_cs);
572 u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type);
573 u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type);
574 void exfat_update_bh(struct buffer_head *bh, int sync);
575 int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync);
576 void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
577 unsigned int size, unsigned char flags);
578 void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec);
579
580 #endif /* !_EXFAT_FS_H */
581