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/atomic.h> 11 #include <linux/ratelimit.h> 12 #include <linux/nls.h> 13 #include <linux/blkdev.h> 14 #include <linux/backing-dev.h> 15 #include <uapi/linux/exfat.h> 16 #include <linux/buffer_head.h> 17 18 #define EXFAT_ROOT_INO 1 19 20 /* 21 * exfat error flags 22 */ 23 enum exfat_error_mode { 24 EXFAT_ERRORS_CONT, /* ignore error and continue */ 25 EXFAT_ERRORS_PANIC, /* panic on error */ 26 EXFAT_ERRORS_RO, /* remount r/o on error */ 27 }; 28 29 /* 30 * exfat nls lossy flag 31 */ 32 enum { 33 NLS_NAME_NO_LOSSY = 0, /* no lossy */ 34 NLS_NAME_LOSSY = 1 << 0, /* just detected incorrect filename(s) */ 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 #define EXFAT_BLK_RA_SIZE(sb) \ 86 (min_t(blkcnt_t, (sb)->s_bdi->ra_pages, (sb)->s_bdi->io_pages) \ 87 << (PAGE_SHIFT - (sb)->s_blocksize_bits)) 88 89 /* 90 * helpers for fat entry. 91 */ 92 #define FAT_ENT_SIZE (4) 93 #define FAT_ENT_SIZE_BITS (2) 94 #define FAT_ENT_OFFSET_SECTOR(sb, loc) (EXFAT_SB(sb)->FAT1_start_sector + \ 95 (((u64)(loc) << FAT_ENT_SIZE_BITS) >> sb->s_blocksize_bits)) 96 #define FAT_ENT_OFFSET_BYTE_IN_SECTOR(sb, loc) \ 97 (((loc) << FAT_ENT_SIZE_BITS) & (sb->s_blocksize - 1)) 98 99 /* 100 * helpers for bitmap. 101 */ 102 #define CLUSTER_TO_BITMAP_ENT(clu) ((clu) - EXFAT_RESERVED_CLUSTERS) 103 #define BITMAP_ENT_TO_CLUSTER(ent) ((ent) + EXFAT_RESERVED_CLUSTERS) 104 #define BITS_PER_SECTOR(sb) ((sb)->s_blocksize * BITS_PER_BYTE) 105 #define BITS_PER_SECTOR_MASK(sb) (BITS_PER_SECTOR(sb) - 1) 106 #define BITMAP_OFFSET_SECTOR_INDEX(sb, ent) \ 107 ((ent / BITS_PER_BYTE) >> (sb)->s_blocksize_bits) 108 #define BITMAP_OFFSET_BIT_IN_SECTOR(sb, ent) (ent & BITS_PER_SECTOR_MASK(sb)) 109 #define BITMAP_OFFSET_BYTE_IN_SECTOR(sb, ent) \ 110 ((ent / BITS_PER_BYTE) & ((sb)->s_blocksize - 1)) 111 #define IGNORED_BITS_REMAINED(clu, clu_base) ((1UL << ((clu) - (clu_base))) - 1) 112 113 #define ES_ENTRY_NUM(name_len) (ES_IDX_LAST_FILENAME(name_len) + 1) 114 /* 19 entries = 1 file entry + 1 stream entry + 17 filename entries */ 115 #define ES_MAX_ENTRY_NUM ES_ENTRY_NUM(MAX_NAME_LENGTH) 116 117 /* 118 * 19 entries x 32 bytes/entry = 608 bytes. 119 * The 608 bytes are in 3 sectors at most (even 512 Byte sector). 120 */ 121 #define DIR_CACHE_SIZE \ 122 (DIV_ROUND_UP(ES_MAX_ENTRY_NUM << DENTRY_SIZE_BITS, SECTOR_SIZE) + 1) 123 124 /* Superblock flags */ 125 #define EXFAT_FLAGS_SHUTDOWN 1 126 127 struct exfat_dentry_namebuf { 128 char *lfn; 129 int lfnbuf_len; /* usually MAX_UNINAME_BUF_SIZE */ 130 }; 131 132 /* unicode name structure */ 133 struct exfat_uni_name { 134 /* +3 for null and for converting */ 135 unsigned short name[MAX_NAME_LENGTH + 3]; 136 u16 name_hash; 137 unsigned char name_len; 138 }; 139 140 /* directory structure */ 141 struct exfat_chain { 142 unsigned int dir; 143 unsigned int size; 144 unsigned char flags; 145 }; 146 147 /* first empty entry hint information */ 148 struct exfat_hint_femp { 149 /* entry index of a directory */ 150 int eidx; 151 /* count of continuous empty entry */ 152 int count; 153 /* the cluster that first empty slot exists in */ 154 struct exfat_chain cur; 155 }; 156 157 /* hint structure */ 158 struct exfat_hint { 159 unsigned int clu; 160 union { 161 unsigned int off; /* cluster offset */ 162 int eidx; /* entry index */ 163 }; 164 }; 165 166 struct exfat_entry_set_cache { 167 struct super_block *sb; 168 unsigned int start_off; 169 int num_bh; 170 struct buffer_head *__bh[DIR_CACHE_SIZE]; 171 struct buffer_head **bh; 172 unsigned int num_entries; 173 bool modified; 174 }; 175 176 #define IS_DYNAMIC_ES(es) ((es)->__bh != (es)->bh) 177 178 struct exfat_dir_entry { 179 /* the cluster where file dentry is located */ 180 struct exfat_chain dir; 181 /* the index of file dentry in ->dir */ 182 int entry; 183 unsigned int type; 184 unsigned int start_clu; 185 unsigned char flags; 186 unsigned short attr; 187 loff_t size; 188 loff_t valid_size; 189 unsigned int num_subdirs; 190 struct timespec64 atime; 191 struct timespec64 mtime; 192 struct timespec64 crtime; 193 struct exfat_dentry_namebuf namebuf; 194 }; 195 196 /* 197 * exfat mount in-memory data 198 */ 199 struct exfat_mount_options { 200 kuid_t fs_uid; 201 kgid_t fs_gid; 202 unsigned short fs_fmask; 203 unsigned short fs_dmask; 204 /* permission for setting the [am]time */ 205 unsigned short allow_utime; 206 /* charset for filename input/display */ 207 char *iocharset; 208 /* on error: continue, panic, remount-ro */ 209 enum exfat_error_mode errors; 210 unsigned utf8:1, /* Use of UTF-8 character set */ 211 sys_tz:1, /* Use local timezone */ 212 discard:1, /* Issue discard requests on deletions */ 213 keep_last_dots:1; /* Keep trailing periods in paths */ 214 int time_offset; /* Offset of timestamps from UTC (in minutes) */ 215 /* Support creating zero-size directory, default: false */ 216 bool zero_size_dir; 217 }; 218 219 /* 220 * EXFAT file system superblock in-memory data 221 */ 222 struct exfat_sb_info { 223 unsigned long long num_sectors; /* num of sectors in volume */ 224 unsigned int num_clusters; /* num of clusters in volume */ 225 unsigned int cluster_size; /* cluster size in bytes */ 226 unsigned int cluster_size_bits; 227 unsigned int sect_per_clus; /* cluster size in sectors */ 228 unsigned int sect_per_clus_bits; 229 unsigned long long FAT1_start_sector; /* FAT1 start sector */ 230 unsigned long long FAT2_start_sector; /* FAT2 start sector */ 231 unsigned long long data_start_sector; /* data area start sector */ 232 unsigned long long data_start_bytes; 233 unsigned int num_FAT_sectors; /* num of FAT sectors */ 234 unsigned int root_dir; /* root dir cluster */ 235 unsigned int dentries_per_clu; /* num of dentries per cluster */ 236 unsigned int dentries_per_clu_bits; 237 unsigned int vol_flags; /* volume flags */ 238 unsigned int vol_flags_persistent; /* volume flags to retain */ 239 struct buffer_head *boot_bh; /* buffer_head of BOOT sector */ 240 241 unsigned int map_clu; /* allocation bitmap start cluster */ 242 unsigned int map_sectors; /* num of allocation bitmap sectors */ 243 struct buffer_head **vol_amap; /* allocation bitmap */ 244 245 unsigned short *vol_utbl; /* upcase table */ 246 247 unsigned int clu_srch_ptr; /* cluster search pointer */ 248 unsigned int used_clusters; /* number of used clusters */ 249 250 unsigned long s_exfat_flags; /* Exfat superblock flags */ 251 252 struct mutex s_lock; /* superblock lock */ 253 struct mutex bitmap_lock; /* bitmap lock */ 254 struct exfat_mount_options options; 255 struct nls_table *nls_io; /* Charset used for input and display */ 256 struct ratelimit_state ratelimit; 257 258 spinlock_t inode_hash_lock; 259 struct hlist_head inode_hashtable[EXFAT_HASH_SIZE]; 260 struct rcu_head rcu; 261 }; 262 263 #define EXFAT_CACHE_VALID 0 264 265 /* 266 * EXFAT file system inode in-memory data 267 */ 268 struct exfat_inode_info { 269 /* the cluster where file dentry is located */ 270 struct exfat_chain dir; 271 /* the index of file dentry in ->dir */ 272 int entry; 273 unsigned int type; 274 unsigned short attr; 275 unsigned int start_clu; 276 unsigned char flags; 277 /* 278 * the copy of low 32bit of i_version to check 279 * the validation of hint_stat. 280 */ 281 unsigned int version; 282 283 /* hint for cluster last accessed */ 284 struct exfat_hint hint_bmap; 285 /* hint for entry index we try to lookup next time */ 286 struct exfat_hint hint_stat; 287 /* hint for first empty entry */ 288 struct exfat_hint_femp hint_femp; 289 290 spinlock_t cache_lru_lock; 291 struct list_head cache_lru; 292 int nr_caches; 293 /* for avoiding the race between alloc and free */ 294 unsigned int cache_valid_id; 295 296 /* on-disk position of directory entry or 0 */ 297 loff_t i_pos; 298 /* 299 * valid_size and zeroed_size are updated from multiple contexts that 300 * are not serialised against each other (page_mkwrite runs without 301 * i_rwsem, while buffered/DIO writes advance them under i_rwsem). Keep 302 * them atomic and only ever advance them with a cmpxchg loop so a 303 * concurrent update can never regress the value or tear on 32-bit. 304 */ 305 atomic64_t valid_size; 306 /* block-aligned size zeroed in the page cache (>= valid_size) */ 307 atomic64_t zeroed_size; 308 /* hash by i_location */ 309 struct hlist_node i_hash_fat; 310 struct inode vfs_inode; 311 /* File creation time */ 312 struct timespec64 i_crtime; 313 }; 314 315 static inline struct exfat_sb_info *EXFAT_SB(struct super_block *sb) 316 { 317 return sb->s_fs_info; 318 } 319 320 static inline struct exfat_inode_info *EXFAT_I(struct inode *inode) 321 { 322 return container_of(inode, struct exfat_inode_info, vfs_inode); 323 } 324 325 static inline loff_t exfat_get_valid_size(struct exfat_inode_info *ei) 326 { 327 return atomic64_read(&ei->valid_size); 328 } 329 330 static inline loff_t exfat_get_zeroed_size(struct exfat_inode_info *ei) 331 { 332 return atomic64_read(&ei->zeroed_size); 333 } 334 335 static inline void exfat_set_valid_size(struct exfat_inode_info *ei, loff_t v) 336 { 337 atomic64_set(&ei->valid_size, v); 338 } 339 340 static inline void exfat_set_zeroed_size(struct exfat_inode_info *ei, loff_t v) 341 { 342 atomic64_set(&ei->zeroed_size, v); 343 } 344 345 /* 346 * Monotonically advance @v to at least @new. Returns true if the value was 347 * actually raised, so callers can decide whether to mark the inode dirty. 348 */ 349 static inline bool exfat_size_advance(atomic64_t *v, loff_t new) 350 { 351 loff_t old = atomic64_read(v); 352 353 do { 354 if (old >= new) 355 return false; 356 } while (!atomic64_try_cmpxchg(v, &old, new)); 357 358 return true; 359 } 360 361 static inline bool exfat_advance_valid_size(struct exfat_inode_info *ei, 362 loff_t new) 363 { 364 return exfat_size_advance(&ei->valid_size, new); 365 } 366 367 static inline bool exfat_advance_zeroed_size(struct exfat_inode_info *ei, 368 loff_t new) 369 { 370 return exfat_size_advance(&ei->zeroed_size, new); 371 } 372 373 static inline int exfat_forced_shutdown(struct super_block *sb) 374 { 375 return test_bit(EXFAT_FLAGS_SHUTDOWN, &EXFAT_SB(sb)->s_exfat_flags); 376 } 377 378 /* 379 * If ->i_mode can't hold 0222 (i.e. ATTR_RO), we use ->i_attrs to 380 * save ATTR_RO instead of ->i_mode. 381 * 382 * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only 383 * bit, it's just used as flag for app. 384 */ 385 static inline int exfat_mode_can_hold_ro(struct inode *inode) 386 { 387 struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); 388 389 if (S_ISDIR(inode->i_mode)) 390 return 0; 391 392 if ((~sbi->options.fs_fmask) & 0222) 393 return 1; 394 return 0; 395 } 396 397 /* Convert attribute bits and a mask to the UNIX mode. */ 398 static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi, 399 unsigned short attr, mode_t mode) 400 { 401 if ((attr & EXFAT_ATTR_READONLY) && !(attr & EXFAT_ATTR_SUBDIR)) 402 mode &= ~0222; 403 404 if (attr & EXFAT_ATTR_SUBDIR) 405 return (mode & ~sbi->options.fs_dmask) | S_IFDIR; 406 407 return (mode & ~sbi->options.fs_fmask) | S_IFREG; 408 } 409 410 /* Return the FAT attribute byte for this inode */ 411 static inline unsigned short exfat_make_attr(struct inode *inode) 412 { 413 unsigned short attr = EXFAT_I(inode)->attr; 414 415 if (S_ISDIR(inode->i_mode)) 416 attr |= EXFAT_ATTR_SUBDIR; 417 if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & 0222)) 418 attr |= EXFAT_ATTR_READONLY; 419 return attr; 420 } 421 422 static inline void exfat_save_attr(struct inode *inode, unsigned short attr) 423 { 424 if (exfat_mode_can_hold_ro(inode)) 425 EXFAT_I(inode)->attr = attr & (EXFAT_ATTR_RWMASK | EXFAT_ATTR_READONLY); 426 else 427 EXFAT_I(inode)->attr = attr & EXFAT_ATTR_RWMASK; 428 } 429 430 static inline bool exfat_is_last_sector_in_cluster(struct exfat_sb_info *sbi, 431 sector_t sec) 432 { 433 return ((sec - sbi->data_start_sector + 1) & 434 ((1 << sbi->sect_per_clus_bits) - 1)) == 0; 435 } 436 437 static inline sector_t exfat_cluster_to_sector(struct exfat_sb_info *sbi, 438 unsigned int clus) 439 { 440 return ((sector_t)(clus - EXFAT_RESERVED_CLUSTERS) << sbi->sect_per_clus_bits) + 441 sbi->data_start_sector; 442 } 443 444 static inline unsigned int exfat_sector_to_cluster(struct exfat_sb_info *sbi, 445 sector_t sec) 446 { 447 return ((sec - sbi->data_start_sector) >> sbi->sect_per_clus_bits) + 448 EXFAT_RESERVED_CLUSTERS; 449 } 450 451 static inline bool is_valid_cluster(struct exfat_sb_info *sbi, 452 unsigned int clus) 453 { 454 return clus >= EXFAT_FIRST_CLUSTER && clus < sbi->num_clusters; 455 } 456 457 static inline loff_t exfat_ondisk_size(const struct inode *inode) 458 { 459 return ((loff_t)inode->i_blocks) << 9; 460 } 461 462 static inline loff_t exfat_cluster_to_phys_bytes(struct exfat_sb_info *sbi, 463 unsigned int clus) 464 { 465 return ((loff_t)(clus - EXFAT_RESERVED_CLUSTERS) << sbi->cluster_size_bits) + 466 sbi->data_start_bytes; 467 } 468 469 /* 470 * helpers for cluster size to byte conversion. 471 */ 472 static inline loff_t exfat_cluster_to_bytes(struct exfat_sb_info *sbi, 473 u32 nr_clusters) 474 { 475 return (loff_t)nr_clusters << sbi->cluster_size_bits; 476 } 477 478 static inline blkcnt_t exfat_cluster_to_sectors(struct exfat_sb_info *sbi, 479 u32 nr_clusters) 480 { 481 return (blkcnt_t)nr_clusters << (sbi->cluster_size_bits - 9); 482 } 483 484 static inline u32 exfat_bytes_to_cluster(struct exfat_sb_info *sbi, loff_t size) 485 { 486 return (u32)(size >> sbi->cluster_size_bits); 487 } 488 489 static inline u32 exfat_bytes_to_cluster_round_up(struct exfat_sb_info *sbi, 490 loff_t size) 491 { 492 if (size <= 0) 493 return 0; 494 return (u32)((size - 1) >> sbi->cluster_size_bits) + 1; 495 } 496 497 static inline u32 exfat_cluster_offset(struct exfat_sb_info *sbi, loff_t off) 498 { 499 return off & (sbi->cluster_size - 1); 500 } 501 502 /* 503 * helpers for block size to byte conversion. 504 */ 505 static inline loff_t exfat_block_to_bytes(struct super_block *sb, 506 sector_t block) 507 { 508 return (loff_t)block << sb->s_blocksize_bits; 509 } 510 511 static inline sector_t exfat_bytes_to_block(struct super_block *sb, loff_t size) 512 { 513 return (sector_t)(size >> sb->s_blocksize_bits); 514 } 515 516 static inline sector_t exfat_bytes_to_block_round_up(struct super_block *sb, 517 loff_t size) 518 { 519 if (size <= 0) 520 return 0; 521 return (sector_t)(((size - 1) >> sb->s_blocksize_bits) + 1); 522 } 523 524 static inline u32 exfat_block_offset(struct super_block *sb, loff_t off) 525 { 526 return (u32)(off & (sb->s_blocksize - 1)); 527 } 528 529 /* 530 * helpers for block size to dentry size conversion. 531 */ 532 static inline u32 exfat_bytes_to_dentries(loff_t b) 533 { 534 return (u32)(b >> DENTRY_SIZE_BITS); 535 } 536 537 static inline u32 exfat_dentries_to_bytes(u32 dentry) 538 { 539 return dentry << DENTRY_SIZE_BITS; 540 } 541 542 /* 543 * helpers for cluster size to dentry size conversion. 544 */ 545 static inline u64 exfat_cluster_to_dentries(struct exfat_sb_info *sbi, 546 u32 nr_clusters) 547 { 548 return (u64)nr_clusters << (sbi->cluster_size_bits - DENTRY_SIZE_BITS); 549 } 550 551 static inline u32 exfat_dentries_to_cluster(struct exfat_sb_info *sbi, 552 u32 dentry) 553 { 554 return dentry >> (sbi->cluster_size_bits - DENTRY_SIZE_BITS); 555 } 556 557 /* super.c */ 558 int exfat_set_volume_dirty(struct super_block *sb); 559 int exfat_clear_volume_dirty(struct super_block *sb); 560 561 /* fatent.c */ 562 #define exfat_get_next_cluster(sb, pclu) \ 563 exfat_cluster_walk(sb, (pclu), 1, ALLOC_FAT_CHAIN) 564 565 int exfat_alloc_cluster(struct inode *inode, unsigned int num_alloc, 566 struct exfat_chain *p_chain, bool sync_bmap, bool contig); 567 int exfat_free_cluster(struct inode *inode, struct exfat_chain *p_chain); 568 int exfat_ent_get(struct super_block *sb, unsigned int loc, 569 unsigned int *content, struct buffer_head **last); 570 int exfat_ent_set(struct super_block *sb, unsigned int loc, 571 unsigned int content); 572 int exfat_chain_cont_cluster(struct super_block *sb, unsigned int chain, 573 unsigned int len); 574 int exfat_zeroed_cluster(struct inode *dir, unsigned int clu); 575 int exfat_find_last_cluster(struct super_block *sb, struct exfat_chain *p_chain, 576 unsigned int *ret_clu); 577 int exfat_count_num_clusters(struct super_block *sb, 578 struct exfat_chain *p_chain, unsigned int *ret_count); 579 int exfat_blk_readahead(struct super_block *sb, sector_t sec, 580 sector_t *ra, blkcnt_t *ra_cnt, sector_t end); 581 582 static inline int 583 exfat_cluster_walk(struct super_block *sb, unsigned int *clu, 584 unsigned int step, int flags) 585 { 586 struct buffer_head *bh = NULL; 587 588 if (flags == ALLOC_NO_FAT_CHAIN) { 589 (*clu) += step; 590 return 0; 591 } 592 593 while (step--) { 594 if (exfat_ent_get(sb, *clu, clu, &bh)) 595 return -EIO; 596 } 597 brelse(bh); 598 599 return 0; 600 } 601 602 /* balloc.c */ 603 int exfat_load_bitmap(struct super_block *sb); 604 void exfat_free_bitmap(struct exfat_sb_info *sbi); 605 int exfat_set_bitmap(struct super_block *sb, unsigned int clu, bool sync); 606 int exfat_clear_bitmap(struct super_block *sb, unsigned int clu, bool sync); 607 bool exfat_test_bitmap(struct super_block *sb, unsigned int clu); 608 unsigned int exfat_find_free_bitmap(struct super_block *sb, unsigned int clu); 609 int exfat_count_used_clusters(struct super_block *sb, unsigned int *ret_count); 610 int exfat_trim_fs(struct inode *inode, struct fstrim_range *range); 611 612 /* file.c */ 613 extern const struct file_operations exfat_file_operations; 614 int __exfat_truncate(struct inode *inode); 615 int exfat_setattr(const struct mnt_idmap *idmap, struct dentry *dentry, 616 struct iattr *attr); 617 int exfat_getattr(const struct mnt_idmap *idmap, const struct path *path, 618 struct kstat *stat, unsigned int request_mask, 619 unsigned int query_flags); 620 struct file_kattr; 621 int exfat_fileattr_get(struct dentry *dentry, struct file_kattr *fa); 622 int exfat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); 623 long exfat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg); 624 long exfat_compat_ioctl(struct file *filp, unsigned int cmd, 625 unsigned long arg); 626 int exfat_force_shutdown(struct super_block *sb, u32 flags); 627 628 /* namei.c */ 629 extern const struct dentry_operations exfat_dentry_ops; 630 extern const struct dentry_operations exfat_utf8_dentry_ops; 631 int exfat_find_empty_entry(struct inode *inode, 632 struct exfat_chain *p_dir, int num_entries, 633 struct exfat_entry_set_cache *es); 634 635 /* cache.c */ 636 int exfat_cache_init(void); 637 void exfat_cache_shutdown(void); 638 void exfat_cache_inval_inode(struct inode *inode); 639 int exfat_get_cluster(struct inode *inode, unsigned int cluster, 640 unsigned int *dclus, unsigned int *count, unsigned int *last_dclus); 641 642 /* dir.c */ 643 extern const struct inode_operations exfat_dir_inode_operations; 644 extern const struct file_operations exfat_dir_operations; 645 unsigned int exfat_get_entry_type(struct exfat_dentry *p_entry); 646 void exfat_init_dir_entry(struct exfat_entry_set_cache *es, 647 unsigned int type, unsigned int start_clu, 648 unsigned long long size, struct timespec64 *ts); 649 void exfat_init_ext_entry(struct exfat_entry_set_cache *es, int num_entries, 650 struct exfat_uni_name *p_uniname, 651 struct exfat_entry_set_cache *old_es, int num_extra); 652 void exfat_remove_entries(struct inode *inode, struct exfat_entry_set_cache *es, 653 int order, bool free_benign); 654 void exfat_update_dir_chksum(struct exfat_entry_set_cache *es); 655 int exfat_calc_num_entries(struct exfat_uni_name *p_uniname); 656 int exfat_find_dir_entry(struct super_block *sb, struct exfat_inode_info *ei, 657 struct exfat_chain *p_dir, struct exfat_uni_name *p_uniname, 658 struct exfat_hint *hint_opt); 659 int exfat_alloc_new_dir(struct inode *inode, struct exfat_chain *clu); 660 struct exfat_dentry *exfat_get_dentry(struct super_block *sb, 661 struct exfat_chain *p_dir, int entry, struct buffer_head **bh); 662 struct exfat_dentry *exfat_get_dentry_cached(struct exfat_entry_set_cache *es, 663 int num); 664 int exfat_get_dentry_set(struct exfat_entry_set_cache *es, 665 struct super_block *sb, struct exfat_chain *p_dir, int entry, 666 unsigned int num_entries); 667 #define exfat_get_dentry_set_by_ei(es, sb, ei) \ 668 exfat_get_dentry_set(es, sb, &(ei)->dir, (ei)->entry, ES_ALL_ENTRIES) 669 int exfat_get_empty_dentry_set(struct exfat_entry_set_cache *es, 670 struct super_block *sb, struct exfat_chain *p_dir, int entry, 671 unsigned int num_entries); 672 int exfat_put_dentry_set(struct exfat_entry_set_cache *es, int sync); 673 int exfat_count_dir_entries(struct super_block *sb, struct exfat_chain *p_dir); 674 int exfat_read_volume_label(struct super_block *sb, 675 struct exfat_uni_name *label_out); 676 int exfat_write_volume_label(struct super_block *sb, 677 struct exfat_uni_name *label); 678 679 static inline int exfat_chain_advance(struct super_block *sb, 680 struct exfat_chain *chain, unsigned int step) 681 { 682 unsigned int clu = chain->dir; 683 unsigned int i; 684 685 if (chain->flags == ALLOC_NO_FAT_CHAIN) { 686 if (unlikely(chain->size < step)) 687 return -EIO; 688 689 chain->size -= step; 690 chain->dir = chain->size ? clu + step : EXFAT_EOF_CLUSTER; 691 return 0; 692 } 693 694 /* 695 * Only the FAT tells where a chain of this kind ends. The size can be 696 * smaller than the chain, see commit 1e5654de0f51 ("exfat: handle 697 * wrong stream entry size in exfat_readdir()"). 698 */ 699 for (i = 0; i < step && clu != EXFAT_EOF_CLUSTER; i++) { 700 if (exfat_get_next_cluster(sb, &clu)) 701 return -EIO; 702 } 703 704 chain->size -= min(chain->size, step); 705 chain->dir = clu; 706 707 return 0; 708 } 709 710 /* inode.c */ 711 extern const struct inode_operations exfat_file_inode_operations; 712 void exfat_sync_inode(struct inode *inode); 713 struct inode *exfat_build_inode(struct super_block *sb, 714 struct exfat_dir_entry *info, loff_t i_pos); 715 void exfat_hash_inode(struct inode *inode, loff_t i_pos); 716 void exfat_unhash_inode(struct inode *inode); 717 struct inode *exfat_iget(struct super_block *sb, loff_t i_pos); 718 int __exfat_write_inode(struct inode *inode, int sync); 719 int exfat_write_inode(struct inode *inode, struct writeback_control *wbc); 720 void exfat_evict_inode(struct inode *inode); 721 int exfat_map_cluster(struct inode *inode, unsigned int clu_offset, 722 unsigned int *clu, unsigned int *count, int create, 723 bool *balloc); 724 725 /* exfat/nls.c */ 726 unsigned short exfat_toupper(struct super_block *sb, unsigned short a); 727 int exfat_uniname_ncmp(struct super_block *sb, unsigned short *a, 728 unsigned short *b, unsigned int len); 729 int exfat_utf16_to_nls(struct super_block *sb, 730 struct exfat_uni_name *uniname, unsigned char *p_cstring, 731 int len); 732 int exfat_nls_to_utf16(struct super_block *sb, 733 const unsigned char *p_cstring, const int len, 734 struct exfat_uni_name *uniname, int *p_lossy); 735 int exfat_create_upcase_table(struct super_block *sb); 736 void exfat_free_upcase_table(struct exfat_sb_info *sbi); 737 738 /* exfat/misc.c */ 739 void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...) 740 __printf(3, 4) __cold; 741 #define exfat_fs_error(sb, fmt, args...) \ 742 __exfat_fs_error(sb, 1, fmt, ## args) 743 #define exfat_fs_error_ratelimit(sb, fmt, args...) \ 744 __exfat_fs_error(sb, __ratelimit(&EXFAT_SB(sb)->ratelimit), \ 745 fmt, ## args) 746 747 /* expand to pr_*() with prefix */ 748 #define exfat_err(sb, fmt, ...) \ 749 pr_err("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__) 750 #define exfat_warn(sb, fmt, ...) \ 751 pr_warn("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__) 752 #define exfat_info(sb, fmt, ...) \ 753 pr_info("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__) 754 #define exfat_debug(sb, fmt, ...) \ 755 pr_debug("exFAT-fs (%s): " fmt "\n", (sb)->s_id, ##__VA_ARGS__) 756 757 void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, 758 u8 tz, __le16 time, __le16 date, u8 time_cs); 759 void exfat_truncate_atime(struct timespec64 *ts); 760 void exfat_truncate_inode_atime(struct inode *inode); 761 void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts, 762 u8 *tz, __le16 *time, __le16 *date, u8 *time_cs); 763 u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type); 764 u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type); 765 int exfat_update_bh(struct buffer_head *bh, int sync); 766 int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync); 767 void exfat_chain_set(struct exfat_chain *ec, unsigned int dir, 768 unsigned int size, unsigned char flags); 769 void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec); 770 771 #endif /* !_EXFAT_FS_H */ 772