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 #define EXFAT_CLUSTERS_UNTRACKED (~0u)
18
19 /*
20 * exfat error flags
21 */
22 enum exfat_error_mode {
23 EXFAT_ERRORS_CONT, /* ignore error and continue */
24 EXFAT_ERRORS_PANIC, /* panic on error */
25 EXFAT_ERRORS_RO, /* remount r/o on error */
26 };
27
28 /*
29 * exfat nls lossy flag
30 */
31 enum {
32 NLS_NAME_NO_LOSSY = 0, /* no lossy */
33 NLS_NAME_LOSSY = 1 << 0, /* just detected incorrect filename(s) */
34 NLS_NAME_OVERLEN = 1 << 1, /* the length is over than its limit */
35 };
36
37 #define EXFAT_HASH_BITS 8
38 #define EXFAT_HASH_SIZE (1UL << EXFAT_HASH_BITS)
39
40 /*
41 * Type Definitions
42 */
43 #define ES_2_ENTRIES 2
44 #define ES_ALL_ENTRIES 0
45
46 #define ES_IDX_FILE 0
47 #define ES_IDX_STREAM 1
48 #define ES_IDX_FIRST_FILENAME 2
49 #define EXFAT_FILENAME_ENTRY_NUM(name_len) \
50 DIV_ROUND_UP(name_len, EXFAT_FILE_NAME_LEN)
51 #define ES_IDX_LAST_FILENAME(name_len) \
52 (ES_IDX_FIRST_FILENAME + EXFAT_FILENAME_ENTRY_NUM(name_len) - 1)
53
54 #define DIR_DELETED 0xFFFFFFF7
55
56 /* type values */
57 #define TYPE_UNUSED 0x0000
58 #define TYPE_DELETED 0x0001
59 #define TYPE_INVALID 0x0002
60 #define TYPE_CRITICAL_PRI 0x0100
61 #define TYPE_BITMAP 0x0101
62 #define TYPE_UPCASE 0x0102
63 #define TYPE_VOLUME 0x0103
64 #define TYPE_DIR 0x0104
65 #define TYPE_FILE 0x011F
66 #define TYPE_CRITICAL_SEC 0x0200
67 #define TYPE_STREAM 0x0201
68 #define TYPE_EXTEND 0x0202
69 #define TYPE_ACL 0x0203
70 #define TYPE_BENIGN_PRI 0x0400
71 #define TYPE_GUID 0x0401
72 #define TYPE_PADDING 0x0402
73 #define TYPE_ACLTAB 0x0403
74 #define TYPE_BENIGN_SEC 0x0800
75 #define TYPE_VENDOR_EXT 0x0801
76 #define TYPE_VENDOR_ALLOC 0x0802
77
78 #define MAX_CHARSET_SIZE 6 /* max size of multi-byte character */
79 #define MAX_NAME_LENGTH 255 /* max len of file name excluding NULL */
80 #define MAX_VFSNAME_BUF_SIZE ((MAX_NAME_LENGTH + 1) * MAX_CHARSET_SIZE)
81
82 #define EXFAT_HINT_NONE -1
83 #define EXFAT_MIN_SUBDIR 2
84
85 /*
86 * helpers for cluster size to byte conversion.
87 */
88 #define EXFAT_CLU_TO_B(b, sbi) ((b) << (sbi)->cluster_size_bits)
89 #define EXFAT_B_TO_CLU(b, sbi) ((b) >> (sbi)->cluster_size_bits)
90 #define EXFAT_B_TO_CLU_ROUND_UP(b, sbi) \
91 (((b - 1) >> (sbi)->cluster_size_bits) + 1)
92 #define EXFAT_CLU_OFFSET(off, sbi) ((off) & ((sbi)->cluster_size - 1))
93
94 /*
95 * helpers for block size to byte conversion.
96 */
97 #define EXFAT_BLK_TO_B(b, sb) ((b) << (sb)->s_blocksize_bits)
98 #define EXFAT_B_TO_BLK(b, sb) ((b) >> (sb)->s_blocksize_bits)
99 #define EXFAT_B_TO_BLK_ROUND_UP(b, sb) \
100 (((b - 1) >> (sb)->s_blocksize_bits) + 1)
101 #define EXFAT_BLK_OFFSET(off, sb) ((off) & ((sb)->s_blocksize - 1))
102
103 /*
104 * helpers for block size to dentry size conversion.
105 */
106 #define EXFAT_B_TO_DEN(b) ((b) >> DENTRY_SIZE_BITS)
107 #define EXFAT_DEN_TO_B(b) ((b) << DENTRY_SIZE_BITS)
108
109 /*
110 * helpers for cluster size to dentry size conversion.
111 */
112 #define EXFAT_CLU_TO_DEN(clu, sbi) \
113 ((clu) << ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS))
114 #define EXFAT_DEN_TO_CLU(dentry, sbi) \
115 ((dentry) >> ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS))
116
117 /*
118 * helpers for fat entry.
119 */
120 #define FAT_ENT_SIZE (4)
121 #define FAT_ENT_SIZE_BITS (2)
122 #define FAT_ENT_OFFSET_SECTOR(sb, loc) (EXFAT_SB(sb)->FAT1_start_sector + \
123 (((u64)loc << FAT_ENT_SIZE_BITS) >> sb->s_blocksize_bits))
124 #define FAT_ENT_OFFSET_BYTE_IN_SECTOR(sb, loc) \
125 ((loc << FAT_ENT_SIZE_BITS) & (sb->s_blocksize - 1))
126
127 /*
128 * helpers for bitmap.
129 */
130 #define CLUSTER_TO_BITMAP_ENT(clu) ((clu) - EXFAT_RESERVED_CLUSTERS)
131 #define BITMAP_ENT_TO_CLUSTER(ent) ((ent) + EXFAT_RESERVED_CLUSTERS)
132 #define BITS_PER_SECTOR(sb) ((sb)->s_blocksize * BITS_PER_BYTE)
133 #define BITS_PER_SECTOR_MASK(sb) (BITS_PER_SECTOR(sb) - 1)
134 #define BITMAP_OFFSET_SECTOR_INDEX(sb, ent) \
135 ((ent / BITS_PER_BYTE) >> (sb)->s_blocksize_bits)
136 #define BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent) (ent & BITS_PER_SECTOR_MASK(sb))
137 #define BITMAP_OFFSET_BYTE_IN_SECTOR(sb, ent) \
138 ((ent / BITS_PER_BYTE) & ((sb)->s_blocksize - 1))
139 #define IGNORED_BITS_REMAINED(clu, clu_base) ((1UL << ((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
152 /* Superblock flags */
153 #define EXFAT_FLAGS_SHUTDOWN 1
154
155 struct exfat_dentry_namebuf {
156 char *lfn;
157 int lfnbuf_len; /* usually MAX_UNINAME_BUF_SIZE */
158 };
159
160 /* unicode name structure */
161 struct exfat_uni_name {
162 /* +3 for null and for converting */
163 unsigned short name[MAX_NAME_LENGTH + 3];
164 u16 name_hash;
165 unsigned char name_len;
166 };
167
168 /* directory structure */
169 struct exfat_chain {
170 unsigned int dir;
171 unsigned int size;
172 unsigned char flags;
173 };
174
175 /* first empty entry hint information */
176 struct exfat_hint_femp {
177 /* entry index of a directory */
178 int eidx;
179 /* count of continuous empty entry */
180 int count;
181 /* the cluster that first empty slot exists in */
182 struct exfat_chain cur;
183 };
184
185 /* hint structure */
186 struct exfat_hint {
187 unsigned int clu;
188 union {
189 unsigned int off; /* cluster offset */
190 int eidx; /* entry index */
191 };
192 };
193
194 struct exfat_entry_set_cache {
195 struct super_block *sb;
196 unsigned int start_off;
197 int num_bh;
198 struct buffer_head *__bh[DIR_CACHE_SIZE];
199 struct buffer_head **bh;
200 unsigned int num_entries;
201 bool modified;
202 };
203
204 #define IS_DYNAMIC_ES(es) ((es)->__bh != (es)->bh)
205
206 struct exfat_dir_entry {
207 /* the cluster where file dentry is located */
208 struct exfat_chain dir;
209 /* the index of file dentry in ->dir */
210 int entry;
211 unsigned int type;
212 unsigned int start_clu;
213 unsigned char flags;
214 unsigned short attr;
215 loff_t size;
216 loff_t valid_size;
217 unsigned int num_subdirs;
218 struct timespec64 atime;
219 struct timespec64 mtime;
220 struct timespec64 crtime;
221 struct exfat_dentry_namebuf namebuf;
222 };
223
224 /*
225 * exfat mount in-memory data
226 */
227 struct exfat_mount_options {
228 kuid_t fs_uid;
229 kgid_t fs_gid;
230 unsigned short fs_fmask;
231 unsigned short fs_dmask;
232 /* permission for setting the [am]time */
233 unsigned short allow_utime;
234 /* charset for filename input/display */
235 char *iocharset;
236 /* on error: continue, panic, remount-ro */
237 enum exfat_error_mode errors;
238 unsigned utf8:1, /* Use of UTF-8 character set */
239 sys_tz:1, /* Use local timezone */
240 discard:1, /* Issue discard requests on deletions */
241 keep_last_dots:1; /* Keep trailing periods in paths */
242 int time_offset; /* Offset of timestamps from UTC (in minutes) */
243 /* Support creating zero-size directory, default: false */
244 bool zero_size_dir;
245 };
246
247 /*
248 * EXFAT file system superblock in-memory data
249 */
250 struct exfat_sb_info {
251 unsigned long long num_sectors; /* num of sectors in volume */
252 unsigned int num_clusters; /* num of clusters in volume */
253 unsigned int cluster_size; /* cluster size in bytes */
254 unsigned int cluster_size_bits;
255 unsigned int sect_per_clus; /* cluster size in sectors */
256 unsigned int sect_per_clus_bits;
257 unsigned long long FAT1_start_sector; /* FAT1 start sector */
258 unsigned long long FAT2_start_sector; /* FAT2 start sector */
259 unsigned long long data_start_sector; /* data area start sector */
260 unsigned int num_FAT_sectors; /* num of FAT sectors */
261 unsigned int root_dir; /* root dir cluster */
262 unsigned int dentries_per_clu; /* num of dentries per cluster */
263 unsigned int vol_flags; /* volume flags */
264 unsigned int vol_flags_persistent; /* volume flags to retain */
265 struct buffer_head *boot_bh; /* buffer_head of BOOT sector */
266
267 unsigned int map_clu; /* allocation bitmap start cluster */
268 unsigned int map_sectors; /* num of allocation bitmap sectors */
269 struct buffer_head **vol_amap; /* allocation bitmap */
270
271 unsigned short *vol_utbl; /* upcase table */
272
273 unsigned int clu_srch_ptr; /* cluster search pointer */
274 unsigned int used_clusters; /* number of used clusters */
275
276 unsigned long s_exfat_flags; /* Exfat superblock flags */
277
278 struct mutex s_lock; /* superblock lock */
279 struct mutex bitmap_lock; /* bitmap lock */
280 struct exfat_mount_options options;
281 struct nls_table *nls_io; /* Charset used for input and display */
282 struct ratelimit_state ratelimit;
283
284 spinlock_t inode_hash_lock;
285 struct hlist_head inode_hashtable[EXFAT_HASH_SIZE];
286 struct rcu_head rcu;
287 };
288
289 #define EXFAT_CACHE_VALID 0
290
291 /*
292 * EXFAT file system inode in-memory data
293 */
294 struct exfat_inode_info {
295 /* the cluster where file dentry is located */
296 struct exfat_chain dir;
297 /* the index of file dentry in ->dir */
298 int entry;
299 unsigned int type;
300 unsigned short attr;
301 unsigned int start_clu;
302 unsigned char flags;
303 /*
304 * the copy of low 32bit of i_version to check
305 * the validation of hint_stat.
306 */
307 unsigned int version;
308
309 /* hint for cluster last accessed */
310 struct exfat_hint hint_bmap;
311 /* hint for entry index we try to lookup next time */
312 struct exfat_hint hint_stat;
313 /* hint for first empty entry */
314 struct exfat_hint_femp hint_femp;
315
316 spinlock_t cache_lru_lock;
317 struct list_head cache_lru;
318 int nr_caches;
319 /* for avoiding the race between alloc and free */
320 unsigned int cache_valid_id;
321
322 /* on-disk position of directory entry or 0 */
323 loff_t i_pos;
324 loff_t valid_size;
325 /* hash by i_location */
326 struct hlist_node i_hash_fat;
327 /* protect bmap against truncate */
328 struct rw_semaphore truncate_lock;
329 struct inode vfs_inode;
330 /* File creation time */
331 struct timespec64 i_crtime;
332 };
333
EXFAT_SB(struct super_block * sb)334 static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb)
335 {
336 return sb->s_fs_info;
337 }
338
EXFAT_I(struct inode * inode)339 static inline struct exfat_inode_info *EXFAT_I(struct inode *inode)
340 {
341 return container_of(inode, struct exfat_inode_info, vfs_inode);
342 }
343
exfat_forced_shutdown(struct super_block * sb)344 static inline int exfat_forced_shutdown(struct super_block *sb)
345 {
346 return test_bit(EXFAT_FLAGS_SHUTDOWN, &EXFAT_SB(sb)->s_exfat_flags);
347 }
348
349 /*
350 * If ->i_mode can't hold 0222 (i.e. ATTR_RO), we use ->i_attrs to
351 * save ATTR_RO instead of ->i_mode.
352 *
353 * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
354 * bit, it's just used as flag for app.
355 */
exfat_mode_can_hold_ro(struct inode * inode)356 static inline int exfat_mode_can_hold_ro(struct inode *inode)
357 {
358 struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
359
360 if (S_ISDIR(inode->i_mode))
361 return 0;
362
363 if ((~sbi->options.fs_fmask) & 0222)
364 return 1;
365 return 0;
366 }
367
368 /* Convert attribute bits and a mask to the UNIX mode. */
exfat_make_mode(struct exfat_sb_info * sbi,unsigned short attr,mode_t mode)369 static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi,
370 unsigned short attr, mode_t mode)
371 {
372 if ((attr & EXFAT_ATTR_READONLY) && !(attr & EXFAT_ATTR_SUBDIR))
373 mode &= ~0222;
374
375 if (attr & EXFAT_ATTR_SUBDIR)
376 return (mode & ~sbi->options.fs_dmask) | S_IFDIR;
377
378 return (mode & ~sbi->options.fs_fmask) | S_IFREG;
379 }
380
381 /* Return the FAT attribute byte for this inode */
exfat_make_attr(struct inode * inode)382 static inline unsigned short exfat_make_attr(struct inode *inode)
383 {
384 unsigned short attr = EXFAT_I(inode)->attr;
385
386 if (S_ISDIR(inode->i_mode))
387 attr |= EXFAT_ATTR_SUBDIR;
388 if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222))
389 attr |= EXFAT_ATTR_READONLY;
390 return attr;
391 }
392
exfat_save_attr(struct inode * inode,unsigned short attr)393 static inline void exfat_save_attr(struct inode *inode, unsigned short attr)
394 {
395 if (exfat_mode_can_hold_ro(inode))
396 EXFAT_I(inode)->attr = attr & (EXFAT_ATTR_RWMASK | EXFAT_ATTR_READONLY);
397 else
398 EXFAT_I(inode)->attr = attr & EXFAT_ATTR_RWMASK;
399 }
400
exfat_is_last_sector_in_cluster(struct exfat_sb_info * sbi,sector_t sec)401 static inline bool exfat_is_last_sector_in_cluster(struct exfat_sb_info *sbi,
402 sector_t sec)
403 {
404 return ((sec - sbi->data_start_sector + 1) &
405 ((1 << sbi->sect_per_clus_bits) - 1)) == 0;
406 }
407
exfat_cluster_to_sector(struct exfat_sb_info * sbi,unsigned int clus)408 static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi,
409 unsigned int clus)
410 {
411 return ((sector_t)(clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) +
412 sbi->data_start_sector;
413 }
414
exfat_sector_to_cluster(struct exfat_sb_info * sbi,sector_t sec)415 static inline unsigned int exfat_sector_to_cluster(struct exfat_sb_info *sbi,
416 sector_t sec)
417 {
418 return ((sec - sbi->data_start_sector) >> sbi->sect_per_clus_bits) +
419 EXFAT_RESERVED_CLUSTERS;
420 }
421
is_valid_cluster(struct exfat_sb_info * sbi,unsigned int clus)422 static inline bool is_valid_cluster(struct exfat_sb_info *sbi,
423 unsigned int clus)
424 {
425 return clus >= EXFAT_FIRST_CLUSTER && clus < sbi->num_clusters;
426 }
427
exfat_ondisk_size(const struct inode * inode)428 static inline loff_t exfat_ondisk_size(const struct inode *inode)
429 {
430 return ((loff_t)inode->i_blocks) << 9;
431 }
432
433 /* super.c */
434 int exfat_set_volume_dirty(struct super_block *sb);
435 int exfat_clear_volume_dirty(struct super_block *sb);
436
437 /* fatent.c */
438 #define exfat_get_next_cluster(sb, pclu) exfat_ent_get(sb, *(pclu), pclu)
439
440 int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
441 struct exfat_chain *p_chain, bool sync_bmap);
442 int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain);
443 int exfat_ent_get(struct super_block *sb, unsigned int loc,
444 unsigned int *content);
445 int exfat_ent_set(struct super_block *sb, unsigned int loc,
446 unsigned int content);
447 int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain,
448 unsigned int len);
449 int exfat_zeroed_cluster(struct inode *dir, unsigned int clu);
450 int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain,
451 unsigned int *ret_clu);
452 int exfat_count_num_clusters(struct super_block *sb,
453 struct exfat_chain *p_chain, unsigned int *ret_count);
454
455 /* balloc.c */
456 int exfat_load_bitmap(struct super_block *sb);
457 void exfat_free_bitmap(struct exfat_sb_info *sbi);
458 int exfat_set_bitmap(struct inode *inode, unsigned int clu, bool sync);
459 void exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync);
460 unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu);
461 int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count);
462 int exfat_trim_fs(struct inode *inode, struct fstrim_range *range);
463
464 /* file.c */
465 extern const struct file_operations exfat_file_operations;
466 int __exfat_truncate(struct inode *inode);
467 void exfat_truncate(struct inode *inode);
468 int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
469 struct iattr *attr);
470 int exfat_getattr(struct mnt_idmap *idmap, const struct path *path,
471 struct kstat *stat, unsigned int request_mask,
472 unsigned int query_flags);
473 int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
474 long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
475 long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
476 unsigned long arg);
477 int exfat_force_shutdown(struct super_block *sb, u32 flags);
478
479 /* namei.c */
480 extern const struct dentry_operations exfat_dentry_ops;
481 extern const struct dentry_operations exfat_utf8_dentry_ops;
482
483 /* cache.c */
484 int exfat_cache_init(void);
485 void exfat_cache_shutdown(void);
486 void exfat_cache_inval_inode(struct inode *inode);
487 int exfat_get_cluster(struct inode *inode, unsigned int cluster,
488 unsigned int *fclus, unsigned int *dclus,
489 unsigned int *last_dclus, int allow_eof);
490
491 /* dir.c */
492 extern const struct inode_operations exfat_dir_inode_operations;
493 extern const struct file_operations exfat_dir_operations;
494 unsigned int exfat_get_entry_type(struct exfat_dentry *p_entry);
495 void exfat_init_dir_entry(struct exfat_entry_set_cache *es,
496 unsigned int type, unsigned int start_clu,
497 unsigned long long size, struct timespec64 *ts);
498 void exfat_init_ext_entry(struct exfat_entry_set_cache *es, int num_entries,
499 struct exfat_uni_name *p_uniname);
500 void exfat_remove_entries(struct inode *inode, struct exfat_entry_set_cache *es,
501 int order);
502 void exfat_update_dir_chksum(struct exfat_entry_set_cache *es);
503 int exfat_calc_num_entries(struct exfat_uni_name *p_uniname);
504 int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei,
505 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname,
506 struct exfat_hint *hint_opt);
507 int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu);
508 struct exfat_dentry *exfat_get_dentry(struct super_block *sb,
509 struct exfat_chain *p_dir, int entry, struct buffer_head **bh);
510 struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es,
511 int num);
512 int exfat_get_dentry_set(struct exfat_entry_set_cache *es,
513 struct super_block *sb, struct exfat_chain *p_dir, int entry,
514 unsigned int num_entries);
515 #define exfat_get_dentry_set_by_ei(es, sb, ei) \
516 exfat_get_dentry_set(es, sb, &(ei)->dir, (ei)->entry, ES_ALL_ENTRIES)
517 int exfat_get_empty_dentry_set(struct exfat_entry_set_cache *es,
518 struct super_block *sb, struct exfat_chain *p_dir, int entry,
519 unsigned int num_entries);
520 int exfat_put_dentry_set(struct exfat_entry_set_cache *es, int sync);
521 int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir);
522
523 /* inode.c */
524 extern const struct inode_operations exfat_file_inode_operations;
525 void exfat_sync_inode(struct inode *inode);
526 struct inode *exfat_build_inode(struct super_block *sb,
527 struct exfat_dir_entry *info, loff_t i_pos);
528 void exfat_hash_inode(struct inode *inode, loff_t i_pos);
529 void exfat_unhash_inode(struct inode *inode);
530 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos);
531 int __exfat_write_inode(struct inode *inode, int sync);
532 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc);
533 void exfat_evict_inode(struct inode *inode);
534 int exfat_block_truncate_page(struct inode *inode, loff_t from);
535
536 /* exfat/nls.c */
537 unsigned short exfat_toupper(struct super_block *sb, unsigned short a);
538 int exfat_uniname_ncmp(struct super_block *sb, unsigned short *a,
539 unsigned short *b, unsigned int len);
540 int exfat_utf16_to_nls(struct super_block *sb,
541 struct exfat_uni_name *uniname, unsigned char *p_cstring,
542 int len);
543 int exfat_nls_to_utf16(struct super_block *sb,
544 const unsigned char *p_cstring, const int len,
545 struct exfat_uni_name *uniname, int *p_lossy);
546 int exfat_create_upcase_table(struct super_block *sb);
547 void exfat_free_upcase_table(struct exfat_sb_info *sbi);
548
549 /* exfat/misc.c */
550 void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)
551 __printf(3, 4) __cold;
552 #define exfat_fs_error(sb, fmt, args...) \
553 __exfat_fs_error(sb, 1, fmt, ## args)
554 #define exfat_fs_error_ratelimit(sb, fmt, args...) \
555 __exfat_fs_error(sb, __ratelimit(&EXFAT_SB(sb)->ratelimit), \
556 fmt, ## args)
557
558 /* expand to pr_*() with prefix */
559 #define exfat_err(sb, fmt, ...) \
560 pr_err("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
561 #define exfat_warn(sb, fmt, ...) \
562 pr_warn("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
563 #define exfat_info(sb, fmt, ...) \
564 pr_info("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
565 #define exfat_debug(sb, fmt, ...) \
566 pr_debug("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
567
568 void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
569 u8 tz, __le16 time, __le16 date, u8 time_cs);
570 void exfat_truncate_atime(struct timespec64 *ts);
571 void exfat_truncate_inode_atime(struct inode *inode);
572 void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
573 u8 *tz, __le16 *time, __le16 *date, u8 *time_cs);
574 u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type);
575 u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type);
576 void exfat_update_bh(struct buffer_head *bh, int sync);
577 int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync);
578 void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
579 unsigned int size, unsigned char flags);
580 void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec);
581
582 #endif /* !_EXFAT_FS_H */
583