fs/exfat/exfat_fs.h

   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
 334 static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb)
 335 {
 336         return sb->s_fs_info;
 337 }
 338
 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
 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  */
 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. */
 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 */
 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
 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
 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
 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
 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
 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
 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 */