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 <linux/backing-dev.h> 14 #include <uapi/linux/exfat.h> 15 16 #define EXFAT_ROOT_INO 1 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 }; 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 #define EXFAT_BLK_RA_SIZE(sb) \ 84 (min_t(blkcnt_t, (sb)->s_bdi->ra_pages, (sb)->s_bdi->io_pages) \ 85 << (PAGE_SHIFT - (sb)->s_blocksize_bits)) 86 87 /* 88 * helpers for cluster size to byte conversion. 89 */ 90 #define EXFAT_CLU_TO_B(b, sbi) ((b) << (sbi)->cluster_size_bits) 91 #define EXFAT_B_TO_CLU(b, sbi) ((b) >> (sbi)->cluster_size_bits) 92 #define EXFAT_B_TO_CLU_ROUND_UP(b, sbi) \ 93 (((b - 1) >> (sbi)->cluster_size_bits) + 1) 94 #define EXFAT_CLU_OFFSET(off, sbi) ((off) & ((sbi)->cluster_size - 1)) 95 96 /* 97 * helpers for block size to byte conversion. 98 */ 99 #define EXFAT_BLK_TO_B(b, sb) ((b) << (sb)->s_blocksize_bits) 100 #define EXFAT_B_TO_BLK(b, sb) ((b) >> (sb)->s_blocksize_bits) 101 #define EXFAT_B_TO_BLK_ROUND_UP(b, sb) \ 102 (((b - 1) >> (sb)->s_blocksize_bits) + 1) 103 #define EXFAT_BLK_OFFSET(off, sb) ((off) & ((sb)->s_blocksize - 1)) 104 105 /* 106 * helpers for block size to dentry size conversion. 107 */ 108 #define EXFAT_B_TO_DEN(b) ((b) >> DENTRY_SIZE_BITS) 109 #define EXFAT_DEN_TO_B(b) ((b) << DENTRY_SIZE_BITS) 110 111 /* 112 * helpers for cluster size to dentry size conversion. 113 */ 114 #define EXFAT_CLU_TO_DEN(clu, sbi) \ 115 ((clu) << ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS)) 116 #define EXFAT_DEN_TO_CLU(dentry, sbi) \ 117 ((dentry) >> ((sbi)->cluster_size_bits - DENTRY_SIZE_BITS)) 118 119 /* 120 * helpers for fat entry. 121 */ 122 #define FAT_ENT_SIZE (4) 123 #define FAT_ENT_SIZE_BITS (2) 124 #define FAT_ENT_OFFSET_SECTOR(sb, loc) (EXFAT_SB(sb)->FAT1_start_sector + \ 125 (((u64)(loc) << FAT_ENT_SIZE_BITS) >> sb->s_blocksize_bits)) 126 #define FAT_ENT_OFFSET_BYTE_IN_SECTOR(sb, loc) \ 127 (((loc) << FAT_ENT_SIZE_BITS) & (sb->s_blocksize - 1)) 128 129 /* 130 * helpers for bitmap. 131 */ 132 #define CLUSTER_TO_BITMAP_ENT(clu) ((clu) - EXFAT_RESERVED_CLUSTERS) 133 #define BITMAP_ENT_TO_CLUSTER(ent) ((ent) + EXFAT_RESERVED_CLUSTERS) 134 #define BITS_PER_SECTOR(sb) ((sb)->s_blocksize * BITS_PER_BYTE) 135 #define BITS_PER_SECTOR_MASK(sb) (BITS_PER_SECTOR(sb) - 1) 136 #define BITMAP_OFFSET_SECTOR_INDEX(sb, ent) \ 137 ((ent / BITS_PER_BYTE) >> (sb)->s_blocksize_bits) 138 #define BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent) (ent & BITS_PER_SECTOR_MASK(sb)) 139 #define BITMAP_OFFSET_BYTE_IN_SECTOR(sb, ent) \ 140 ((ent / BITS_PER_BYTE) & ((sb)->s_blocksize - 1)) 141 #define IGNORED_BITS_REMAINED(clu, clu_base) ((1UL << ((clu) - (clu_base))) - 1) 142 143 #define ES_ENTRY_NUM(name_len) (ES_IDX_LAST_FILENAME(name_len) + 1) 144 /* 19 entries = 1 file entry + 1 stream entry + 17 filename entries */ 145 #define ES_MAX_ENTRY_NUM ES_ENTRY_NUM(MAX_NAME_LENGTH) 146 147 /* 148 * 19 entries x 32 bytes/entry = 608 bytes. 149 * The 608 bytes are in 3 sectors at most (even 512 Byte sector). 150 */ 151 #define DIR_CACHE_SIZE \ 152 (DIV_ROUND_UP(EXFAT_DEN_TO_B(ES_MAX_ENTRY_NUM), SECTOR_SIZE) + 1) 153 154 /* Superblock flags */ 155 #define EXFAT_FLAGS_SHUTDOWN 1 156 157 struct exfat_dentry_namebuf { 158 char *lfn; 159 int lfnbuf_len; /* usually MAX_UNINAME_BUF_SIZE */ 160 }; 161 162 /* unicode name structure */ 163 struct exfat_uni_name { 164 /* +3 for null and for converting */ 165 unsigned short name[MAX_NAME_LENGTH + 3]; 166 u16 name_hash; 167 unsigned char name_len; 168 }; 169 170 /* directory structure */ 171 struct exfat_chain { 172 unsigned int dir; 173 unsigned int size; 174 unsigned char flags; 175 }; 176 177 /* first empty entry hint information */ 178 struct exfat_hint_femp { 179 /* entry index of a directory */ 180 int eidx; 181 /* count of continuous empty entry */ 182 int count; 183 /* the cluster that first empty slot exists in */ 184 struct exfat_chain cur; 185 }; 186 187 /* hint structure */ 188 struct exfat_hint { 189 unsigned int clu; 190 union { 191 unsigned int off; /* cluster offset */ 192 int eidx; /* entry index */ 193 }; 194 }; 195 196 struct exfat_entry_set_cache { 197 struct super_block *sb; 198 unsigned int start_off; 199 int num_bh; 200 struct buffer_head *__bh[DIR_CACHE_SIZE]; 201 struct buffer_head **bh; 202 unsigned int num_entries; 203 bool modified; 204 }; 205 206 #define IS_DYNAMIC_ES(es) ((es)->__bh != (es)->bh) 207 208 struct exfat_dir_entry { 209 /* the cluster where file dentry is located */ 210 struct exfat_chain dir; 211 /* the index of file dentry in ->dir */ 212 int entry; 213 unsigned int type; 214 unsigned int start_clu; 215 unsigned char flags; 216 unsigned short attr; 217 loff_t size; 218 loff_t valid_size; 219 unsigned int num_subdirs; 220 struct timespec64 atime; 221 struct timespec64 mtime; 222 struct timespec64 crtime; 223 struct exfat_dentry_namebuf namebuf; 224 }; 225 226 /* 227 * exfat mount in-memory data 228 */ 229 struct exfat_mount_options { 230 kuid_t fs_uid; 231 kgid_t fs_gid; 232 unsigned short fs_fmask; 233 unsigned short fs_dmask; 234 /* permission for setting the [am]time */ 235 unsigned short allow_utime; 236 /* charset for filename input/display */ 237 char *iocharset; 238 /* on error: continue, panic, remount-ro */ 239 enum exfat_error_mode errors; 240 unsigned utf8:1, /* Use of UTF-8 character set */ 241 sys_tz:1, /* Use local timezone */ 242 discard:1, /* Issue discard requests on deletions */ 243 keep_last_dots:1; /* Keep trailing periods in paths */ 244 int time_offset; /* Offset of timestamps from UTC (in minutes) */ 245 /* Support creating zero-size directory, default: false */ 246 bool zero_size_dir; 247 }; 248 249 /* 250 * EXFAT file system superblock in-memory data 251 */ 252 struct exfat_sb_info { 253 unsigned long long num_sectors; /* num of sectors in volume */ 254 unsigned int num_clusters; /* num of clusters in volume */ 255 unsigned int cluster_size; /* cluster size in bytes */ 256 unsigned int cluster_size_bits; 257 unsigned int sect_per_clus; /* cluster size in sectors */ 258 unsigned int sect_per_clus_bits; 259 unsigned long long FAT1_start_sector; /* FAT1 start sector */ 260 unsigned long long FAT2_start_sector; /* FAT2 start sector */ 261 unsigned long long data_start_sector; /* data area start sector */ 262 unsigned int num_FAT_sectors; /* num of FAT sectors */ 263 unsigned int root_dir; /* root dir cluster */ 264 unsigned int dentries_per_clu; /* num of dentries per cluster */ 265 unsigned int vol_flags; /* volume flags */ 266 unsigned int vol_flags_persistent; /* volume flags to retain */ 267 struct buffer_head *boot_bh; /* buffer_head of BOOT sector */ 268 269 unsigned int map_clu; /* allocation bitmap start cluster */ 270 unsigned int map_sectors; /* num of allocation bitmap sectors */ 271 struct buffer_head **vol_amap; /* allocation bitmap */ 272 273 unsigned short *vol_utbl; /* upcase table */ 274 275 unsigned int clu_srch_ptr; /* cluster search pointer */ 276 unsigned int used_clusters; /* number of used clusters */ 277 278 unsigned long s_exfat_flags; /* Exfat superblock flags */ 279 280 struct mutex s_lock; /* superblock lock */ 281 struct mutex bitmap_lock; /* bitmap lock */ 282 struct exfat_mount_options options; 283 struct nls_table *nls_io; /* Charset used for input and display */ 284 struct ratelimit_state ratelimit; 285 286 spinlock_t inode_hash_lock; 287 struct hlist_head inode_hashtable[EXFAT_HASH_SIZE]; 288 struct rcu_head rcu; 289 }; 290 291 #define EXFAT_CACHE_VALID 0 292 293 /* 294 * EXFAT file system inode in-memory data 295 */ 296 struct exfat_inode_info { 297 /* the cluster where file dentry is located */ 298 struct exfat_chain dir; 299 /* the index of file dentry in ->dir */ 300 int entry; 301 unsigned int type; 302 unsigned short attr; 303 unsigned int start_clu; 304 unsigned char flags; 305 /* 306 * the copy of low 32bit of i_version to check 307 * the validation of hint_stat. 308 */ 309 unsigned int version; 310 311 /* hint for cluster last accessed */ 312 struct exfat_hint hint_bmap; 313 /* hint for entry index we try to lookup next time */ 314 struct exfat_hint hint_stat; 315 /* hint for first empty entry */ 316 struct exfat_hint_femp hint_femp; 317 318 spinlock_t cache_lru_lock; 319 struct list_head cache_lru; 320 int nr_caches; 321 /* for avoiding the race between alloc and free */ 322 unsigned int cache_valid_id; 323 324 /* on-disk position of directory entry or 0 */ 325 loff_t i_pos; 326 loff_t valid_size; 327 /* hash by i_location */ 328 struct hlist_node i_hash_fat; 329 /* protect bmap against truncate */ 330 struct rw_semaphore truncate_lock; 331 struct inode vfs_inode; 332 /* File creation time */ 333 struct timespec64 i_crtime; 334 }; 335 336 static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb) 337 { 338 return sb->s_fs_info; 339 } 340 341 static inline struct exfat_inode_info *EXFAT_I(struct inode *inode) 342 { 343 return container_of(inode, struct exfat_inode_info, vfs_inode); 344 } 345 346 static inline int exfat_forced_shutdown(struct super_block *sb) 347 { 348 return test_bit(EXFAT_FLAGS_SHUTDOWN, &EXFAT_SB(sb)->s_exfat_flags); 349 } 350 351 /* 352 * If ->i_mode can't hold 0222 (i.e. ATTR_RO), we use ->i_attrs to 353 * save ATTR_RO instead of ->i_mode. 354 * 355 * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only 356 * bit, it's just used as flag for app. 357 */ 358 static inline int exfat_mode_can_hold_ro(struct inode *inode) 359 { 360 struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); 361 362 if (S_ISDIR(inode->i_mode)) 363 return 0; 364 365 if ((~sbi->options.fs_fmask) & 0222) 366 return 1; 367 return 0; 368 } 369 370 /* Convert attribute bits and a mask to the UNIX mode. */ 371 static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi, 372 unsigned short attr, mode_t mode) 373 { 374 if ((attr & EXFAT_ATTR_READONLY) && !(attr & EXFAT_ATTR_SUBDIR)) 375 mode &= ~0222; 376 377 if (attr & EXFAT_ATTR_SUBDIR) 378 return (mode & ~sbi->options.fs_dmask) | S_IFDIR; 379 380 return (mode & ~sbi->options.fs_fmask) | S_IFREG; 381 } 382 383 /* Return the FAT attribute byte for this inode */ 384 static inline unsigned short exfat_make_attr(struct inode *inode) 385 { 386 unsigned short attr = EXFAT_I(inode)->attr; 387 388 if (S_ISDIR(inode->i_mode)) 389 attr |= EXFAT_ATTR_SUBDIR; 390 if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222)) 391 attr |= EXFAT_ATTR_READONLY; 392 return attr; 393 } 394 395 static inline void exfat_save_attr(struct inode *inode, unsigned short attr) 396 { 397 if (exfat_mode_can_hold_ro(inode)) 398 EXFAT_I(inode)->attr = attr & (EXFAT_ATTR_RWMASK | EXFAT_ATTR_READONLY); 399 else 400 EXFAT_I(inode)->attr = attr & EXFAT_ATTR_RWMASK; 401 } 402 403 static inline bool exfat_is_last_sector_in_cluster(struct exfat_sb_info *sbi, 404 sector_t sec) 405 { 406 return ((sec - sbi->data_start_sector + 1) & 407 ((1 << sbi->sect_per_clus_bits) - 1)) == 0; 408 } 409 410 static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi, 411 unsigned int clus) 412 { 413 return ((sector_t)(clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) + 414 sbi->data_start_sector; 415 } 416 417 static inline unsigned int exfat_sector_to_cluster(struct exfat_sb_info *sbi, 418 sector_t sec) 419 { 420 return ((sec - sbi->data_start_sector) >> sbi->sect_per_clus_bits) + 421 EXFAT_RESERVED_CLUSTERS; 422 } 423 424 static inline bool is_valid_cluster(struct exfat_sb_info *sbi, 425 unsigned int clus) 426 { 427 return clus >= EXFAT_FIRST_CLUSTER && clus < sbi->num_clusters; 428 } 429 430 static inline loff_t exfat_ondisk_size(const struct inode *inode) 431 { 432 return ((loff_t)inode->i_blocks) << 9; 433 } 434 435 /* super.c */ 436 int exfat_set_volume_dirty(struct super_block *sb); 437 int exfat_clear_volume_dirty(struct super_block *sb); 438 439 /* fatent.c */ 440 #define exfat_get_next_cluster(sb, pclu) \ 441 exfat_cluster_walk(sb, (pclu), 1, ALLOC_FAT_CHAIN) 442 443 int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc, 444 struct exfat_chain *p_chain, bool sync_bmap); 445 int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain); 446 int exfat_ent_get(struct super_block *sb, unsigned int loc, 447 unsigned int *content, struct buffer_head **last); 448 int exfat_ent_set(struct super_block *sb, unsigned int loc, 449 unsigned int content); 450 int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain, 451 unsigned int len); 452 int exfat_zeroed_cluster(struct inode *dir, unsigned int clu); 453 int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain, 454 unsigned int *ret_clu); 455 int exfat_count_num_clusters(struct super_block *sb, 456 struct exfat_chain *p_chain, unsigned int *ret_count); 457 int exfat_blk_readahead(struct super_block *sb, sector_t sec, 458 sector_t *ra, blkcnt_t *ra_cnt, sector_t end); 459 460 static inline int 461 exfat_cluster_walk(struct super_block *sb, unsigned int *clu, 462 unsigned int step, int flags) 463 { 464 struct buffer_head *bh = NULL; 465 466 if (flags == ALLOC_NO_FAT_CHAIN) { 467 (*clu) += step; 468 return 0; 469 } 470 471 while (step--) { 472 if (exfat_ent_get(sb, *clu, clu, &bh)) 473 return -EIO; 474 } 475 brelse(bh); 476 477 return 0; 478 } 479 480 /* balloc.c */ 481 int exfat_load_bitmap(struct super_block *sb); 482 void exfat_free_bitmap(struct exfat_sb_info *sbi); 483 int exfat_set_bitmap(struct super_block *sb, unsigned int clu, bool sync); 484 int exfat_clear_bitmap(struct super_block *sb, unsigned int clu, bool sync); 485 bool exfat_test_bitmap(struct super_block *sb, unsigned int clu); 486 unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu); 487 int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count); 488 int exfat_trim_fs(struct inode *inode, struct fstrim_range *range); 489 490 /* file.c */ 491 extern const struct file_operations exfat_file_operations; 492 int __exfat_truncate(struct inode *inode); 493 void exfat_truncate(struct inode *inode); 494 int exfat_setattr(struct mnt_idmap *idmap, struct dentry *dentry, 495 struct iattr *attr); 496 int exfat_getattr(struct mnt_idmap *idmap, const struct path *path, 497 struct kstat *stat, unsigned int request_mask, 498 unsigned int query_flags); 499 int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 500 long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg); 501 long exfat_compat_ioctl(struct file *filp, unsigned int cmd, 502 unsigned long arg); 503 int exfat_force_shutdown(struct super_block *sb, u32 flags); 504 505 /* namei.c */ 506 extern const struct dentry_operations exfat_dentry_ops; 507 extern const struct dentry_operations exfat_utf8_dentry_ops; 508 int exfat_find_empty_entry(struct inode *inode, 509 struct exfat_chain *p_dir, int num_entries, 510 struct exfat_entry_set_cache *es); 511 512 /* cache.c */ 513 int exfat_cache_init(void); 514 void exfat_cache_shutdown(void); 515 void exfat_cache_inval_inode(struct inode *inode); 516 int exfat_get_cluster(struct inode *inode, unsigned int cluster, 517 unsigned int *dclus, unsigned int *count, unsigned int *last_dclus); 518 519 /* dir.c */ 520 extern const struct inode_operations exfat_dir_inode_operations; 521 extern const struct file_operations exfat_dir_operations; 522 unsigned int exfat_get_entry_type(struct exfat_dentry *p_entry); 523 void exfat_init_dir_entry(struct exfat_entry_set_cache *es, 524 unsigned int type, unsigned int start_clu, 525 unsigned long long size, struct timespec64 *ts); 526 void exfat_init_ext_entry(struct exfat_entry_set_cache *es, int num_entries, 527 struct exfat_uni_name *p_uniname); 528 void exfat_remove_entries(struct inode *inode, struct exfat_entry_set_cache *es, 529 int order); 530 void exfat_update_dir_chksum(struct exfat_entry_set_cache *es); 531 int exfat_calc_num_entries(struct exfat_uni_name *p_uniname); 532 int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, 533 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, 534 struct exfat_hint *hint_opt); 535 int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu); 536 struct exfat_dentry *exfat_get_dentry(struct super_block *sb, 537 struct exfat_chain *p_dir, int entry, struct buffer_head **bh); 538 struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es, 539 int num); 540 int exfat_get_dentry_set(struct exfat_entry_set_cache *es, 541 struct super_block *sb, struct exfat_chain *p_dir, int entry, 542 unsigned int num_entries); 543 #define exfat_get_dentry_set_by_ei(es, sb, ei) \ 544 exfat_get_dentry_set(es, sb, &(ei)->dir, (ei)->entry, ES_ALL_ENTRIES) 545 int exfat_get_empty_dentry_set(struct exfat_entry_set_cache *es, 546 struct super_block *sb, struct exfat_chain *p_dir, int entry, 547 unsigned int num_entries); 548 int exfat_put_dentry_set(struct exfat_entry_set_cache *es, int sync); 549 int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir); 550 int exfat_read_volume_label(struct super_block *sb, 551 struct exfat_uni_name *label_out); 552 int exfat_write_volume_label(struct super_block *sb, 553 struct exfat_uni_name *label); 554 555 static inline int exfat_chain_advance(struct super_block *sb, 556 struct exfat_chain *chain, unsigned int step) 557 { 558 unsigned int clu = chain->dir; 559 560 if (unlikely(chain->size < step)) 561 return -EIO; 562 563 if (exfat_cluster_walk(sb, &clu, step, chain->flags)) 564 return -EIO; 565 566 chain->size -= step; 567 568 if (chain->size == 0 && chain->flags == ALLOC_NO_FAT_CHAIN) 569 chain->dir = EXFAT_EOF_CLUSTER; 570 else 571 chain->dir = clu; 572 573 return 0; 574 } 575 576 /* inode.c */ 577 extern const struct inode_operations exfat_file_inode_operations; 578 void exfat_sync_inode(struct inode *inode); 579 struct inode *exfat_build_inode(struct super_block *sb, 580 struct exfat_dir_entry *info, loff_t i_pos); 581 void exfat_hash_inode(struct inode *inode, loff_t i_pos); 582 void exfat_unhash_inode(struct inode *inode); 583 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos); 584 int __exfat_write_inode(struct inode *inode, int sync); 585 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc); 586 void exfat_evict_inode(struct inode *inode); 587 int exfat_block_truncate_page(struct inode *inode, loff_t from); 588 589 /* exfat/nls.c */ 590 unsigned short exfat_toupper(struct super_block *sb, unsigned short a); 591 int exfat_uniname_ncmp(struct super_block *sb, unsigned short *a, 592 unsigned short *b, unsigned int len); 593 int exfat_utf16_to_nls(struct super_block *sb, 594 struct exfat_uni_name *uniname, unsigned char *p_cstring, 595 int len); 596 int exfat_nls_to_utf16(struct super_block *sb, 597 const unsigned char *p_cstring, const int len, 598 struct exfat_uni_name *uniname, int *p_lossy); 599 int exfat_create_upcase_table(struct super_block *sb); 600 void exfat_free_upcase_table(struct exfat_sb_info *sbi); 601 602 /* exfat/misc.c */ 603 void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...) 604 __printf(3, 4) __cold; 605 #define exfat_fs_error(sb, fmt, args...) \ 606 __exfat_fs_error(sb, 1, fmt, ## args) 607 #define exfat_fs_error_ratelimit(sb, fmt, args...) \ 608 __exfat_fs_error(sb, __ratelimit(&EXFAT_SB(sb)->ratelimit), \ 609 fmt, ## args) 610 611 /* expand to pr_*() with prefix */ 612 #define exfat_err(sb, fmt, ...) \ 613 pr_err("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__) 614 #define exfat_warn(sb, fmt, ...) \ 615 pr_warn("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__) 616 #define exfat_info(sb, fmt, ...) \ 617 pr_info("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__) 618 #define exfat_debug(sb, fmt, ...) \ 619 pr_debug("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__) 620 621 void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, 622 u8 tz, __le16 time, __le16 date, u8 time_cs); 623 void exfat_truncate_atime(struct timespec64 *ts); 624 void exfat_truncate_inode_atime(struct inode *inode); 625 void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, 626 u8 *tz, __le16 *time, __le16 *date, u8 *time_cs); 627 u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type); 628 u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type); 629 int exfat_update_bh(struct buffer_head *bh, int sync); 630 int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync); 631 void exfat_chain_set(struct exfat_chain *ec, unsigned int dir, 632 unsigned int size, unsigned char flags); 633 void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec); 634 635 #endif /* !_EXFAT_FS_H */ 636