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 };
33
34 #define EXFAT_HASH_BITS 8
35 #define EXFAT_HASH_SIZE (1UL << EXFAT_HASH_BITS)
36
37 /*
38 * Type Definitions
39 */
40 #define ES_2_ENTRIES 2
41 #define ES_ALL_ENTRIES 0
42
43 #define ES_IDX_FILE 0
44 #define ES_IDX_STREAM 1
45 #define ES_IDX_FIRST_FILENAME 2
46 #define EXFAT_FILENAME_ENTRY_NUM(name_len) \
47 DIV_ROUND_UP(name_len, EXFAT_FILE_NAME_LEN)
48 #define ES_IDX_LAST_FILENAME(name_len) \
49 (ES_IDX_FIRST_FILENAME + EXFAT_FILENAME_ENTRY_NUM(name_len) - 1)
50
51 #define DIR_DELETED 0xFFFFFFF7
52
53 /* type values */
54 #define TYPE_UNUSED 0x0000
55 #define TYPE_DELETED 0x0001
56 #define TYPE_INVALID 0x0002
57 #define TYPE_CRITICAL_PRI 0x0100
58 #define TYPE_BITMAP 0x0101
59 #define TYPE_UPCASE 0x0102
60 #define TYPE_VOLUME 0x0103
61 #define TYPE_DIR 0x0104
62 #define TYPE_FILE 0x011F
63 #define TYPE_CRITICAL_SEC 0x0200
64 #define TYPE_STREAM 0x0201
65 #define TYPE_EXTEND 0x0202
66 #define TYPE_ACL 0x0203
67 #define TYPE_BENIGN_PRI 0x0400
68 #define TYPE_GUID 0x0401
69 #define TYPE_PADDING 0x0402
70 #define TYPE_ACLTAB 0x0403
71 #define TYPE_BENIGN_SEC 0x0800
72 #define TYPE_VENDOR_EXT 0x0801
73 #define TYPE_VENDOR_ALLOC 0x0802
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 IGNORED_BITS_REMAINED(clu, clu_base) ((1UL << ((clu) - (clu_base))) - 1)
137
138 #define ES_ENTRY_NUM(name_len) (ES_IDX_LAST_FILENAME(name_len) + 1)
139 /* 19 entries = 1 file entry + 1 stream entry + 17 filename entries */
140 #define ES_MAX_ENTRY_NUM ES_ENTRY_NUM(MAX_NAME_LENGTH)
141
142 /*
143 * 19 entries x 32 bytes/entry = 608 bytes.
144 * The 608 bytes are in 3 sectors at most (even 512 Byte sector).
145 */
146 #define DIR_CACHE_SIZE \
147 (DIV_ROUND_UP(EXFAT_DEN_TO_B(ES_MAX_ENTRY_NUM), SECTOR_SIZE) + 1)
148
149 /* Superblock flags */
150 #define EXFAT_FLAGS_SHUTDOWN 1
151
152 struct exfat_dentry_namebuf {
153 char *lfn;
154 int lfnbuf_len; /* usually MAX_UNINAME_BUF_SIZE */
155 };
156
157 /* unicode name structure */
158 struct 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 */
166 struct exfat_chain {
167 unsigned int dir;
168 unsigned int size;
169 unsigned char flags;
170 };
171
172 /* first empty entry hint information */
173 struct 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 */
183 struct exfat_hint {
184 unsigned int clu;
185 union {
186 unsigned int off; /* cluster offset */
187 int eidx; /* entry index */
188 };
189 };
190
191 struct 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
203 struct exfat_dir_entry {
204 /* the cluster where file dentry is located */
205 struct exfat_chain dir;
206 /* the index of file dentry in ->dir */
207 int entry;
208 unsigned int type;
209 unsigned int start_clu;
210 unsigned char flags;
211 unsigned short attr;
212 loff_t size;
213 loff_t valid_size;
214 unsigned int num_subdirs;
215 struct timespec64 atime;
216 struct timespec64 mtime;
217 struct timespec64 crtime;
218 struct exfat_dentry_namebuf namebuf;
219 };
220
221 /*
222 * exfat mount in-memory data
223 */
224 struct exfat_mount_options {
225 kuid_t fs_uid;
226 kgid_t fs_gid;
227 unsigned short fs_fmask;
228 unsigned short fs_dmask;
229 /* permission for setting the [am]time */
230 unsigned short allow_utime;
231 /* charset for filename input/display */
232 char *iocharset;
233 /* on error: continue, panic, remount-ro */
234 enum exfat_error_mode errors;
235 unsigned utf8:1, /* Use of UTF-8 character set */
236 sys_tz:1, /* Use local timezone */
237 discard:1, /* Issue discard requests on deletions */
238 keep_last_dots:1; /* Keep trailing periods in paths */
239 int time_offset; /* Offset of timestamps from UTC (in minutes) */
240 /* Support creating zero-size directory, default: false */
241 bool zero_size_dir;
242 };
243
244 /*
245 * EXFAT file system superblock in-memory data
246 */
247 struct exfat_sb_info {
248 unsigned long long num_sectors; /* num of sectors in volume */
249 unsigned int num_clusters; /* num of clusters in volume */
250 unsigned int cluster_size; /* cluster size in bytes */
251 unsigned int cluster_size_bits;
252 unsigned int sect_per_clus; /* cluster size in sectors */
253 unsigned int sect_per_clus_bits;
254 unsigned long long FAT1_start_sector; /* FAT1 start sector */
255 unsigned long long FAT2_start_sector; /* FAT2 start sector */
256 unsigned long long data_start_sector; /* data area start sector */
257 unsigned int num_FAT_sectors; /* num of FAT sectors */
258 unsigned int root_dir; /* root dir cluster */
259 unsigned int dentries_per_clu; /* num of dentries per cluster */
260 unsigned int vol_flags; /* volume flags */
261 unsigned int vol_flags_persistent; /* volume flags to retain */
262 struct buffer_head *boot_bh; /* buffer_head of BOOT sector */
263
264 unsigned int map_clu; /* allocation bitmap start cluster */
265 unsigned int map_sectors; /* num of allocation bitmap sectors */
266 struct buffer_head **vol_amap; /* allocation bitmap */
267
268 unsigned short *vol_utbl; /* upcase table */
269
270 unsigned int clu_srch_ptr; /* cluster search pointer */
271 unsigned int used_clusters; /* number of used clusters */
272
273 unsigned long s_exfat_flags; /* Exfat superblock flags */
274
275 struct mutex s_lock; /* superblock lock */
276 struct mutex bitmap_lock; /* bitmap lock */
277 struct exfat_mount_options options;
278 struct nls_table *nls_io; /* Charset used for input and display */
279 struct ratelimit_state ratelimit;
280
281 spinlock_t inode_hash_lock;
282 struct hlist_head inode_hashtable[EXFAT_HASH_SIZE];
283 struct rcu_head rcu;
284 };
285
286 #define EXFAT_CACHE_VALID 0
287
288 /*
289 * EXFAT file system inode in-memory data
290 */
291 struct exfat_inode_info {
292 /* the cluster where file dentry is located */
293 struct exfat_chain dir;
294 /* the index of file dentry in ->dir */
295 int entry;
296 unsigned int type;
297 unsigned short attr;
298 unsigned int start_clu;
299 unsigned char flags;
300 /*
301 * the copy of low 32bit of i_version to check
302 * the validation of hint_stat.
303 */
304 unsigned int version;
305
306 /* hint for cluster last accessed */
307 struct exfat_hint hint_bmap;
308 /* hint for entry index we try to lookup next time */
309 struct exfat_hint hint_stat;
310 /* hint for first empty entry */
311 struct exfat_hint_femp hint_femp;
312
313 spinlock_t cache_lru_lock;
314 struct list_head cache_lru;
315 int nr_caches;
316 /* for avoiding the race between alloc and free */
317 unsigned int cache_valid_id;
318
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
EXFAT_SB(struct super_block * sb)331 static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb)
332 {
333 return sb->s_fs_info;
334 }
335
EXFAT_I(struct inode * inode)336 static inline struct exfat_inode_info *EXFAT_I(struct inode *inode)
337 {
338 return container_of(inode, struct exfat_inode_info, vfs_inode);
339 }
340
exfat_forced_shutdown(struct super_block * sb)341 static inline int exfat_forced_shutdown(struct super_block *sb)
342 {
343 return test_bit(EXFAT_FLAGS_SHUTDOWN, &EXFAT_SB(sb)->s_exfat_flags);
344 }
345
346 /*
347 * If ->i_mode can't hold 0222 (i.e. ATTR_RO), we use ->i_attrs to
348 * save ATTR_RO instead of ->i_mode.
349 *
350 * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
351 * bit, it's just used as flag for app.
352 */
exfat_mode_can_hold_ro(struct inode * inode)353 static inline int exfat_mode_can_hold_ro(struct inode *inode)
354 {
355 struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
356
357 if (S_ISDIR(inode->i_mode))
358 return 0;
359
360 if ((~sbi->options.fs_fmask) & 0222)
361 return 1;
362 return 0;
363 }
364
365 /* Convert attribute bits and a mask to the UNIX mode. */
exfat_make_mode(struct exfat_sb_info * sbi,unsigned short attr,mode_t mode)366 static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi,
367 unsigned short attr, mode_t mode)
368 {
369 if ((attr & EXFAT_ATTR_READONLY) && !(attr & EXFAT_ATTR_SUBDIR))
370 mode &= ~0222;
371
372 if (attr & EXFAT_ATTR_SUBDIR)
373 return (mode & ~sbi->options.fs_dmask) | S_IFDIR;
374
375 return (mode & ~sbi->options.fs_fmask) | S_IFREG;
376 }
377
378 /* Return the FAT attribute byte for this inode */
exfat_make_attr(struct inode * inode)379 static inline unsigned short exfat_make_attr(struct inode *inode)
380 {
381 unsigned short attr = EXFAT_I(inode)->attr;
382
383 if (S_ISDIR(inode->i_mode))
384 attr |= EXFAT_ATTR_SUBDIR;
385 if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222))
386 attr |= EXFAT_ATTR_READONLY;
387 return attr;
388 }
389
exfat_save_attr(struct inode * inode,unsigned short attr)390 static inline void exfat_save_attr(struct inode *inode, unsigned short attr)
391 {
392 if (exfat_mode_can_hold_ro(inode))
393 EXFAT_I(inode)->attr = attr & (EXFAT_ATTR_RWMASK | EXFAT_ATTR_READONLY);
394 else
395 EXFAT_I(inode)->attr = attr & EXFAT_ATTR_RWMASK;
396 }
397
exfat_is_last_sector_in_cluster(struct exfat_sb_info * sbi,sector_t sec)398 static inline bool exfat_is_last_sector_in_cluster(struct exfat_sb_info *sbi,
399 sector_t sec)
400 {
401 return ((sec - sbi->data_start_sector + 1) &
402 ((1 << sbi->sect_per_clus_bits) - 1)) == 0;
403 }
404
exfat_cluster_to_sector(struct exfat_sb_info * sbi,unsigned int clus)405 static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi,
406 unsigned int clus)
407 {
408 return ((sector_t)(clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) +
409 sbi->data_start_sector;
410 }
411
exfat_sector_to_cluster(struct exfat_sb_info * sbi,sector_t sec)412 static inline unsigned int exfat_sector_to_cluster(struct exfat_sb_info *sbi,
413 sector_t sec)
414 {
415 return ((sec - sbi->data_start_sector) >> sbi->sect_per_clus_bits) +
416 EXFAT_RESERVED_CLUSTERS;
417 }
418
is_valid_cluster(struct exfat_sb_info * sbi,unsigned int clus)419 static inline bool is_valid_cluster(struct exfat_sb_info *sbi,
420 unsigned int clus)
421 {
422 return clus >= EXFAT_FIRST_CLUSTER && clus < sbi->num_clusters;
423 }
424
exfat_ondisk_size(const struct inode * inode)425 static inline loff_t exfat_ondisk_size(const struct inode *inode)
426 {
427 return ((loff_t)inode->i_blocks) << 9;
428 }
429
430 /* super.c */
431 int exfat_set_volume_dirty(struct super_block *sb);
432 int exfat_clear_volume_dirty(struct super_block *sb);
433
434 /* fatent.c */
435 #define exfat_get_next_cluster(sb, pclu) exfat_ent_get(sb, *(pclu), pclu)
436
437 int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc,
438 struct exfat_chain *p_chain, bool sync_bmap);
439 int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain);
440 int exfat_ent_get(struct super_block *sb, unsigned int loc,
441 unsigned int *content);
442 int exfat_ent_set(struct super_block *sb, unsigned int loc,
443 unsigned int content);
444 int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain,
445 unsigned int len);
446 int exfat_zeroed_cluster(struct inode *dir, unsigned int clu);
447 int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain,
448 unsigned int *ret_clu);
449 int exfat_count_num_clusters(struct super_block *sb,
450 struct exfat_chain *p_chain, unsigned int *ret_count);
451
452 /* balloc.c */
453 int exfat_load_bitmap(struct super_block *sb);
454 void exfat_free_bitmap(struct exfat_sb_info *sbi);
455 int exfat_set_bitmap(struct inode *inode, unsigned int clu, bool sync);
456 int exfat_clear_bitmap(struct inode *inode, unsigned int clu, bool sync);
457 unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu);
458 int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count);
459 int exfat_trim_fs(struct inode *inode, struct fstrim_range *range);
460
461 /* file.c */
462 extern const struct file_operations exfat_file_operations;
463 int __exfat_truncate(struct inode *inode);
464 void exfat_truncate(struct inode *inode);
465 int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
466 struct iattr *attr);
467 int exfat_getattr(struct mnt_idmap *idmap, const struct path *path,
468 struct kstat *stat, unsigned int request_mask,
469 unsigned int query_flags);
470 int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync);
471 long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
472 long exfat_compat_ioctl(struct file *filp, unsigned int cmd,
473 unsigned long arg);
474 int exfat_force_shutdown(struct super_block *sb, u32 flags);
475
476 /* namei.c */
477 extern const struct dentry_operations exfat_dentry_ops;
478 extern const struct dentry_operations exfat_utf8_dentry_ops;
479 int exfat_find_empty_entry(struct inode *inode,
480 struct exfat_chain *p_dir, int num_entries,
481 struct exfat_entry_set_cache *es);
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 int exfat_read_volume_label(struct super_block *sb,
523 struct exfat_uni_name *label_out);
524 int exfat_write_volume_label(struct super_block *sb,
525 struct exfat_uni_name *label);
526
527 /* inode.c */
528 extern const struct inode_operations exfat_file_inode_operations;
529 void exfat_sync_inode(struct inode *inode);
530 struct inode *exfat_build_inode(struct super_block *sb,
531 struct exfat_dir_entry *info, loff_t i_pos);
532 void exfat_hash_inode(struct inode *inode, loff_t i_pos);
533 void exfat_unhash_inode(struct inode *inode);
534 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos);
535 int __exfat_write_inode(struct inode *inode, int sync);
536 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc);
537 void exfat_evict_inode(struct inode *inode);
538 int exfat_block_truncate_page(struct inode *inode, loff_t from);
539
540 /* exfat/nls.c */
541 unsigned short exfat_toupper(struct super_block *sb, unsigned short a);
542 int exfat_uniname_ncmp(struct super_block *sb, unsigned short *a,
543 unsigned short *b, unsigned int len);
544 int exfat_utf16_to_nls(struct super_block *sb,
545 struct exfat_uni_name *uniname, unsigned char *p_cstring,
546 int len);
547 int exfat_nls_to_utf16(struct super_block *sb,
548 const unsigned char *p_cstring, const int len,
549 struct exfat_uni_name *uniname, int *p_lossy);
550 int exfat_create_upcase_table(struct super_block *sb);
551 void exfat_free_upcase_table(struct exfat_sb_info *sbi);
552
553 /* exfat/misc.c */
554 void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)
555 __printf(3, 4) __cold;
556 #define exfat_fs_error(sb, fmt, args...) \
557 __exfat_fs_error(sb, 1, fmt, ## args)
558 #define exfat_fs_error_ratelimit(sb, fmt, args...) \
559 __exfat_fs_error(sb, __ratelimit(&EXFAT_SB(sb)->ratelimit), \
560 fmt, ## args)
561
562 /* expand to pr_*() with prefix */
563 #define exfat_err(sb, fmt, ...) \
564 pr_err("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
565 #define exfat_warn(sb, fmt, ...) \
566 pr_warn("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
567 #define exfat_info(sb, fmt, ...) \
568 pr_info("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
569 #define exfat_debug(sb, fmt, ...) \
570 pr_debug("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__)
571
572 void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
573 u8 tz, __le16 time, __le16 date, u8 time_cs);
574 void exfat_truncate_atime(struct timespec64 *ts);
575 void exfat_truncate_inode_atime(struct inode *inode);
576 void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
577 u8 *tz, __le16 *time, __le16 *date, u8 *time_cs);
578 u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type);
579 u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type);
580 void exfat_update_bh(struct buffer_head *bh, int sync);
581 int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync);
582 void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
583 unsigned int size, unsigned char flags);
584 void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec);
585
586 #endif /* !_EXFAT_FS_H */
587