fs/hfsplus/hfsplus_fs.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  linux/include/linux/hfsplus_fs.h
   4  *
   5  * Copyright (C) 1999
   6  * Brad Boyer (flar@pants.nu)
   7  * (C) 2003 Ardis Technologies <roman@ardistech.com>
   8  *
   9  */
  10
  11 #ifndef _LINUX_HFSPLUS_FS_H
  12 #define _LINUX_HFSPLUS_FS_H
  13
  14 #ifdef pr_fmt
  15 #undef pr_fmt
  16 #endif
  17
  18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  19
  20 #include <linux/fs.h>
  21 #include <linux/mutex.h>
  22 #include <linux/buffer_head.h>
  23 #include <linux/blkdev.h>
  24 #include "hfsplus_raw.h"
  25
  26 #define DBG_BNODE_REFS  0x00000001
  27 #define DBG_BNODE_MOD   0x00000002
  28 #define DBG_CAT_MOD     0x00000004
  29 #define DBG_INODE       0x00000008
  30 #define DBG_SUPER       0x00000010
  31 #define DBG_EXTENT      0x00000020
  32 #define DBG_BITMAP      0x00000040
  33 #define DBG_ATTR_MOD    0x00000080
  34
  35 #if 0
  36 #define DBG_MASK        (DBG_EXTENT|DBG_INODE|DBG_BNODE_MOD)
  37 #define DBG_MASK        (DBG_BNODE_MOD|DBG_CAT_MOD|DBG_INODE)
  38 #define DBG_MASK        (DBG_CAT_MOD|DBG_BNODE_REFS|DBG_INODE|DBG_EXTENT)
  39 #endif
  40 #define DBG_MASK        (0)
  41
  42 #define hfs_dbg(flg, fmt, ...)                                  \
  43 do {                                                            \
  44         if (DBG_##flg & DBG_MASK)                               \
  45                 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__);  \
  46 } while (0)
  47
  48 #define hfs_dbg_cont(flg, fmt, ...)                             \
  49 do {                                                            \
  50         if (DBG_##flg & DBG_MASK)                               \
  51                 pr_cont(fmt, ##__VA_ARGS__);                    \
  52 } while (0)
  53
  54 /* Runtime config options */
  55 #define HFSPLUS_DEF_CR_TYPE    0x3F3F3F3F  /* '????' */
  56
  57 #define HFSPLUS_TYPE_DATA 0x00
  58 #define HFSPLUS_TYPE_RSRC 0xFF
  59
  60 typedef int (*btree_keycmp)(const hfsplus_btree_key *,
  61                 const hfsplus_btree_key *);
  62
  63 #define NODE_HASH_SIZE  256
  64
  65 /* B-tree mutex nested subclasses */
  66 enum hfsplus_btree_mutex_classes {
  67         CATALOG_BTREE_MUTEX,
  68         EXTENTS_BTREE_MUTEX,
  69         ATTR_BTREE_MUTEX,
  70 };
  71
  72 /* An HFS+ BTree held in memory */
  73 struct hfs_btree {
  74         struct super_block *sb;
  75         struct inode *inode;
  76         btree_keycmp keycmp;
  77
  78         u32 cnid;
  79         u32 root;
  80         u32 leaf_count;
  81         u32 leaf_head;
  82         u32 leaf_tail;
  83         u32 node_count;
  84         u32 free_nodes;
  85         u32 attributes;
  86
  87         unsigned int node_size;
  88         unsigned int node_size_shift;
  89         unsigned int max_key_len;
  90         unsigned int depth;
  91
  92         struct mutex tree_lock;
  93
  94         unsigned int pages_per_bnode;
  95         spinlock_t hash_lock;
  96         struct hfs_bnode *node_hash[NODE_HASH_SIZE];
  97         int node_hash_cnt;
  98 };
  99
 100 struct page;
 101
 102 /* An HFS+ BTree node in memory */
 103 struct hfs_bnode {
 104         struct hfs_btree *tree;
 105
 106         u32 prev;
 107         u32 this;
 108         u32 next;
 109         u32 parent;
 110
 111         u16 num_recs;
 112         u8 type;
 113         u8 height;
 114
 115         struct hfs_bnode *next_hash;
 116         unsigned long flags;
 117         wait_queue_head_t lock_wq;
 118         atomic_t refcnt;
 119         unsigned int page_offset;
 120         struct page *page[];
 121 };
 122
 123 #define HFS_BNODE_LOCK          0
 124 #define HFS_BNODE_ERROR         1
 125 #define HFS_BNODE_NEW           2
 126 #define HFS_BNODE_DIRTY         3
 127 #define HFS_BNODE_DELETED       4
 128
 129 /*
 130  * Attributes file states
 131  */
 132 #define HFSPLUS_EMPTY_ATTR_TREE         0
 133 #define HFSPLUS_CREATING_ATTR_TREE      1
 134 #define HFSPLUS_VALID_ATTR_TREE         2
 135 #define HFSPLUS_FAILED_ATTR_TREE        3
 136
 137 /*
 138  * HFS+ superblock info (built from Volume Header on disk)
 139  */
 140
 141 struct hfsplus_vh;
 142 struct hfs_btree;
 143
 144 struct hfsplus_sb_info {
 145         void *s_vhdr_buf;
 146         struct hfsplus_vh *s_vhdr;
 147         void *s_backup_vhdr_buf;
 148         struct hfsplus_vh *s_backup_vhdr;
 149         struct hfs_btree *ext_tree;
 150         struct hfs_btree *cat_tree;
 151         struct hfs_btree *attr_tree;
 152         atomic_t attr_tree_state;
 153         struct inode *alloc_file;
 154         struct inode *hidden_dir;
 155         struct nls_table *nls;
 156
 157         /* Runtime variables */
 158         u32 blockoffset;
 159         sector_t part_start;
 160         sector_t sect_count;
 161         int fs_shift;
 162
 163         /* immutable data from the volume header */
 164         u32 alloc_blksz;
 165         int alloc_blksz_shift;
 166         u32 total_blocks;
 167         u32 data_clump_blocks, rsrc_clump_blocks;
 168
 169         /* mutable data from the volume header, protected by alloc_mutex */
 170         u32 free_blocks;
 171         struct mutex alloc_mutex;
 172
 173         /* mutable data from the volume header, protected by vh_mutex */
 174         u32 next_cnid;
 175         u32 file_count;
 176         u32 folder_count;
 177         struct mutex vh_mutex;
 178
 179         /* Config options */
 180         u32 creator;
 181         u32 type;
 182
 183         umode_t umask;
 184         kuid_t uid;
 185         kgid_t gid;
 186
 187         int part, session;
 188         unsigned long flags;
 189
 190         int work_queued;               /* non-zero delayed work is queued */
 191         struct delayed_work sync_work; /* FS sync delayed work */
 192         spinlock_t work_lock;          /* protects sync_work and work_queued */
 193 };
 194
 195 #define HFSPLUS_SB_WRITEBACKUP  0
 196 #define HFSPLUS_SB_NODECOMPOSE  1
 197 #define HFSPLUS_SB_FORCE        2
 198 #define HFSPLUS_SB_HFSX         3
 199 #define HFSPLUS_SB_CASEFOLD     4
 200 #define HFSPLUS_SB_NOBARRIER    5
 201
 202 static inline struct hfsplus_sb_info *HFSPLUS_SB(struct super_block *sb)
 203 {
 204         return sb->s_fs_info;
 205 }
 206
 207
 208 struct hfsplus_inode_info {
 209         atomic_t opencnt;
 210
 211         /*
 212          * Extent allocation information, protected by extents_lock.
 213          */
 214         u32 first_blocks;
 215         u32 clump_blocks;
 216         u32 alloc_blocks;
 217         u32 cached_start;
 218         u32 cached_blocks;
 219         hfsplus_extent_rec first_extents;
 220         hfsplus_extent_rec cached_extents;
 221         unsigned int extent_state;
 222         struct mutex extents_lock;
 223
 224         /*
 225          * Immutable data.
 226          */
 227         struct inode *rsrc_inode;
 228         __be32 create_date;
 229
 230         /*
 231          * Protected by sbi->vh_mutex.
 232          */
 233         u32 linkid;
 234
 235         /*
 236          * Accessed using atomic bitops.
 237          */
 238         unsigned long flags;
 239
 240         /*
 241          * Protected by i_mutex.
 242          */
 243         sector_t fs_blocks;
 244         u8 userflags;           /* BSD user file flags */
 245         u32 subfolders;         /* Subfolder count (HFSX only) */
 246         struct list_head open_dir_list;
 247         spinlock_t open_dir_lock;
 248         loff_t phys_size;
 249
 250         struct inode vfs_inode;
 251 };
 252
 253 #define HFSPLUS_EXT_DIRTY       0x0001
 254 #define HFSPLUS_EXT_NEW         0x0002
 255
 256 #define HFSPLUS_I_RSRC          0       /* represents a resource fork */
 257 #define HFSPLUS_I_CAT_DIRTY     1       /* has changes in the catalog tree */
 258 #define HFSPLUS_I_EXT_DIRTY     2       /* has changes in the extent tree */
 259 #define HFSPLUS_I_ALLOC_DIRTY   3       /* has changes in the allocation file */
 260 #define HFSPLUS_I_ATTR_DIRTY    4       /* has changes in the attributes tree */
 261
 262 #define HFSPLUS_IS_RSRC(inode) \
 263         test_bit(HFSPLUS_I_RSRC, &HFSPLUS_I(inode)->flags)
 264
 265 static inline struct hfsplus_inode_info *HFSPLUS_I(struct inode *inode)
 266 {
 267         return container_of(inode, struct hfsplus_inode_info, vfs_inode);
 268 }
 269
 270 /*
 271  * Mark an inode dirty, and also mark the btree in which the
 272  * specific type of metadata is stored.
 273  * For data or metadata that gets written back by into the catalog btree
 274  * by hfsplus_write_inode a plain mark_inode_dirty call is enough.
 275  */
 276 static inline void hfsplus_mark_inode_dirty(struct inode *inode,
 277                 unsigned int flag)
 278 {
 279         set_bit(flag, &HFSPLUS_I(inode)->flags);
 280         mark_inode_dirty(inode);
 281 }
 282
 283 struct hfs_find_data {
 284         /* filled by caller */
 285         hfsplus_btree_key *search_key;
 286         hfsplus_btree_key *key;
 287         /* filled by find */
 288         struct hfs_btree *tree;
 289         struct hfs_bnode *bnode;
 290         /* filled by findrec */
 291         int record;
 292         int keyoffset, keylength;
 293         int entryoffset, entrylength;
 294 };
 295
 296 struct hfsplus_readdir_data {
 297         struct list_head list;
 298         struct file *file;
 299         struct hfsplus_cat_key key;
 300 };
 301
 302 /*
 303  * Find minimum acceptible I/O size for an hfsplus sb.
 304  */
 305 static inline unsigned short hfsplus_min_io_size(struct super_block *sb)
 306 {
 307         return max_t(unsigned short, bdev_logical_block_size(sb->s_bdev),
 308                      HFSPLUS_SECTOR_SIZE);
 309 }
 310
 311 #define hfs_btree_open hfsplus_btree_open
 312 #define hfs_btree_close hfsplus_btree_close
 313 #define hfs_btree_write hfsplus_btree_write
 314 #define hfs_bmap_reserve hfsplus_bmap_reserve
 315 #define hfs_bmap_alloc hfsplus_bmap_alloc
 316 #define hfs_bmap_free hfsplus_bmap_free
 317 #define hfs_bnode_read hfsplus_bnode_read
 318 #define hfs_bnode_read_u16 hfsplus_bnode_read_u16
 319 #define hfs_bnode_read_u8 hfsplus_bnode_read_u8
 320 #define hfs_bnode_read_key hfsplus_bnode_read_key
 321 #define hfs_bnode_write hfsplus_bnode_write
 322 #define hfs_bnode_write_u16 hfsplus_bnode_write_u16
 323 #define hfs_bnode_clear hfsplus_bnode_clear
 324 #define hfs_bnode_copy hfsplus_bnode_copy
 325 #define hfs_bnode_move hfsplus_bnode_move
 326 #define hfs_bnode_dump hfsplus_bnode_dump
 327 #define hfs_bnode_unlink hfsplus_bnode_unlink
 328 #define hfs_bnode_findhash hfsplus_bnode_findhash
 329 #define hfs_bnode_find hfsplus_bnode_find
 330 #define hfs_bnode_unhash hfsplus_bnode_unhash
 331 #define hfs_bnode_free hfsplus_bnode_free
 332 #define hfs_bnode_create hfsplus_bnode_create
 333 #define hfs_bnode_get hfsplus_bnode_get
 334 #define hfs_bnode_put hfsplus_bnode_put
 335 #define hfs_brec_lenoff hfsplus_brec_lenoff
 336 #define hfs_brec_keylen hfsplus_brec_keylen
 337 #define hfs_brec_insert hfsplus_brec_insert
 338 #define hfs_brec_remove hfsplus_brec_remove
 339 #define hfs_find_init hfsplus_find_init
 340 #define hfs_find_exit hfsplus_find_exit
 341 #define __hfs_brec_find __hfsplus_brec_find
 342 #define hfs_brec_find hfsplus_brec_find
 343 #define hfs_brec_read hfsplus_brec_read
 344 #define hfs_brec_goto hfsplus_brec_goto
 345 #define hfs_part_find hfsplus_part_find
 346
 347 /*
 348  * definitions for ext2 flag ioctls (linux really needs a generic
 349  * interface for this).
 350  */
 351
 352 /* ext2 ioctls (EXT2_IOC_GETFLAGS and EXT2_IOC_SETFLAGS) to support
 353  * chattr/lsattr */
 354 #define HFSPLUS_IOC_EXT2_GETFLAGS       FS_IOC_GETFLAGS
 355 #define HFSPLUS_IOC_EXT2_SETFLAGS       FS_IOC_SETFLAGS
 356
 357
 358 /*
 359  * hfs+-specific ioctl for making the filesystem bootable
 360  */
 361 #define HFSPLUS_IOC_BLESS _IO('h', 0x80)
 362
 363 typedef int (*search_strategy_t)(struct hfs_bnode *,
 364                                 struct hfs_find_data *,
 365                                 int *, int *, int *);
 366
 367 /*
 368  * Functions in any *.c used in other files
 369  */
 370
 371 /* attributes.c */
 372 int __init hfsplus_create_attr_tree_cache(void);
 373 void hfsplus_destroy_attr_tree_cache(void);
 374 int hfsplus_attr_bin_cmp_key(const hfsplus_btree_key *k1,
 375                              const hfsplus_btree_key *k2);
 376 int hfsplus_attr_build_key(struct super_block *sb, hfsplus_btree_key *key,
 377                            u32 cnid, const char *name);
 378 hfsplus_attr_entry *hfsplus_alloc_attr_entry(void);
 379 void hfsplus_destroy_attr_entry(hfsplus_attr_entry *entry);
 380 int hfsplus_find_attr(struct super_block *sb, u32 cnid, const char *name,
 381                       struct hfs_find_data *fd);
 382 int hfsplus_attr_exists(struct inode *inode, const char *name);
 383 int hfsplus_create_attr(struct inode *inode, const char *name,
 384                         const void *value, size_t size);
 385 int hfsplus_delete_attr(struct inode *inode, const char *name);
 386 int hfsplus_delete_all_attrs(struct inode *dir, u32 cnid);
 387
 388 /* bitmap.c */
 389 int hfsplus_block_allocate(struct super_block *sb, u32 size, u32 offset,
 390                            u32 *max);
 391 int hfsplus_block_free(struct super_block *sb, u32 offset, u32 count);
 392
 393 /* btree.c */
 394 u32 hfsplus_calc_btree_clump_size(u32 block_size, u32 node_size, u64 sectors,
 395                                   int file_id);
 396 struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id);
 397 void hfs_btree_close(struct hfs_btree *tree);
 398 int hfs_btree_write(struct hfs_btree *tree);
 399 int hfs_bmap_reserve(struct hfs_btree *tree, int rsvd_nodes);
 400 struct hfs_bnode *hfs_bmap_alloc(struct hfs_btree *tree);
 401 void hfs_bmap_free(struct hfs_bnode *node);
 402
 403 /* bnode.c */
 404 void hfs_bnode_read(struct hfs_bnode *node, void *buf, int off, int len);
 405 u16 hfs_bnode_read_u16(struct hfs_bnode *node, int off);
 406 u8 hfs_bnode_read_u8(struct hfs_bnode *node, int off);
 407 void hfs_bnode_read_key(struct hfs_bnode *node, void *key, int off);
 408 void hfs_bnode_write(struct hfs_bnode *node, void *buf, int off, int len);
 409 void hfs_bnode_write_u16(struct hfs_bnode *node, int off, u16 data);
 410 void hfs_bnode_clear(struct hfs_bnode *node, int off, int len);
 411 void hfs_bnode_copy(struct hfs_bnode *dst_node, int dst,
 412                     struct hfs_bnode *src_node, int src, int len);
 413 void hfs_bnode_move(struct hfs_bnode *node, int dst, int src, int len);
 414 void hfs_bnode_dump(struct hfs_bnode *node);
 415 void hfs_bnode_unlink(struct hfs_bnode *node);
 416 struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *tree, u32 cnid);
 417 void hfs_bnode_unhash(struct hfs_bnode *node);
 418 struct hfs_bnode *hfs_bnode_find(struct hfs_btree *tree, u32 num);
 419 void hfs_bnode_free(struct hfs_bnode *node);
 420 struct hfs_bnode *hfs_bnode_create(struct hfs_btree *tree, u32 num);
 421 void hfs_bnode_get(struct hfs_bnode *node);
 422 void hfs_bnode_put(struct hfs_bnode *node);
 423 bool hfs_bnode_need_zeroout(struct hfs_btree *tree);
 424
 425 /* brec.c */
 426 u16 hfs_brec_lenoff(struct hfs_bnode *node, u16 rec, u16 *off);
 427 u16 hfs_brec_keylen(struct hfs_bnode *node, u16 rec);
 428 int hfs_brec_insert(struct hfs_find_data *fd, void *entry, int entry_len);
 429 int hfs_brec_remove(struct hfs_find_data *fd);
 430
 431 /* bfind.c */
 432 int hfs_find_init(struct hfs_btree *tree, struct hfs_find_data *fd);
 433 void hfs_find_exit(struct hfs_find_data *fd);
 434 int hfs_find_1st_rec_by_cnid(struct hfs_bnode *bnode, struct hfs_find_data *fd,
 435                              int *begin, int *end, int *cur_rec);
 436 int hfs_find_rec_by_key(struct hfs_bnode *bnode, struct hfs_find_data *fd,
 437                         int *begin, int *end, int *cur_rec);
 438 int __hfs_brec_find(struct hfs_bnode *bnode, struct hfs_find_data *fd,
 439                     search_strategy_t rec_found);
 440 int hfs_brec_find(struct hfs_find_data *fd, search_strategy_t do_key_compare);
 441 int hfs_brec_read(struct hfs_find_data *fd, void *rec, int rec_len);
 442 int hfs_brec_goto(struct hfs_find_data *fd, int cnt);
 443
 444 /* catalog.c */
 445 int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
 446                              const hfsplus_btree_key *k2);
 447 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
 448                             const hfsplus_btree_key *k2);
 449 int hfsplus_cat_build_key(struct super_block *sb, hfsplus_btree_key *key,
 450                            u32 parent, const struct qstr *str);
 451 void hfsplus_cat_build_key_with_cnid(struct super_block *sb,
 452                                      hfsplus_btree_key *key, u32 parent);
 453 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms);
 454 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
 455                      struct hfs_find_data *fd);
 456 int hfsplus_create_cat(u32 cnid, struct inode *dir, const struct qstr *str,
 457                        struct inode *inode);
 458 int hfsplus_delete_cat(u32 cnid, struct inode *dir, const struct qstr *str);
 459 int hfsplus_rename_cat(u32 cnid, struct inode *src_dir, const struct qstr *src_name,
 460                        struct inode *dst_dir, const struct qstr *dst_name);
 461
 462 /* dir.c */
 463 extern const struct inode_operations hfsplus_dir_inode_operations;
 464 extern const struct file_operations hfsplus_dir_operations;
 465
 466 /* extents.c */
 467 int hfsplus_ext_cmp_key(const hfsplus_btree_key *k1,
 468                         const hfsplus_btree_key *k2);
 469 int hfsplus_ext_write_extent(struct inode *inode);
 470 int hfsplus_get_block(struct inode *inode, sector_t iblock,
 471                       struct buffer_head *bh_result, int create);
 472 int hfsplus_free_fork(struct super_block *sb, u32 cnid,
 473                       struct hfsplus_fork_raw *fork, int type);
 474 int hfsplus_file_extend(struct inode *inode, bool zeroout);
 475 void hfsplus_file_truncate(struct inode *inode);
 476
 477 /* inode.c */
 478 extern const struct address_space_operations hfsplus_aops;
 479 extern const struct address_space_operations hfsplus_btree_aops;
 480 extern const struct dentry_operations hfsplus_dentry_operations;
 481
 482 struct inode *hfsplus_new_inode(struct super_block *sb, struct inode *dir,
 483                                 umode_t mode);
 484 void hfsplus_delete_inode(struct inode *inode);
 485 void hfsplus_inode_read_fork(struct inode *inode,
 486                              struct hfsplus_fork_raw *fork);
 487 void hfsplus_inode_write_fork(struct inode *inode,
 488                               struct hfsplus_fork_raw *fork);
 489 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd);
 490 int hfsplus_cat_write_inode(struct inode *inode);
 491 int hfsplus_getattr(const struct path *path, struct kstat *stat,
 492                     u32 request_mask, unsigned int query_flags);
 493 int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
 494                        int datasync);
 495
 496 /* ioctl.c */
 497 long hfsplus_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
 498
 499 /* options.c */
 500 void hfsplus_fill_defaults(struct hfsplus_sb_info *opts);
 501 int hfsplus_parse_options_remount(char *input, int *force);
 502 int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi);
 503 int hfsplus_show_options(struct seq_file *seq, struct dentry *root);
 504
 505 /* part_tbl.c */
 506 int hfs_part_find(struct super_block *sb, sector_t *part_start,
 507                   sector_t *part_size);
 508
 509 /* super.c */
 510 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino);
 511 void hfsplus_mark_mdb_dirty(struct super_block *sb);
 512
 513 /* tables.c */
 514 extern u16 hfsplus_case_fold_table[];
 515 extern u16 hfsplus_decompose_table[];
 516 extern u16 hfsplus_compose_table[];
 517
 518 /* unicode.c */
 519 int hfsplus_strcasecmp(const struct hfsplus_unistr *s1,
 520                        const struct hfsplus_unistr *s2);
 521 int hfsplus_strcmp(const struct hfsplus_unistr *s1,
 522                    const struct hfsplus_unistr *s2);
 523 int hfsplus_uni2asc(struct super_block *sb, const struct hfsplus_unistr *ustr,
 524                     char *astr, int *len_p);
 525 int hfsplus_asc2uni(struct super_block *sb, struct hfsplus_unistr *ustr,
 526                     int max_unistr_len, const char *astr, int len);
 527 int hfsplus_hash_dentry(const struct dentry *dentry, struct qstr *str);
 528 int hfsplus_compare_dentry(const struct dentry *dentry, unsigned int len,
 529                            const char *str, const struct qstr *name);
 530
 531 /* wrapper.c */
 532 int hfsplus_submit_bio(struct super_block *sb, sector_t sector, void *buf,
 533                        void **data, int op, int op_flags);
 534 int hfsplus_read_wrapper(struct super_block *sb);
 535
 536 /*
 537  * time helpers: convert between 1904-base and 1970-base timestamps
 538  *
 539  * HFS+ implementations are highly inconsistent, this one matches the
 540  * traditional behavior of 64-bit Linux, giving the most useful
 541  * time range between 1970 and 2106, by treating any on-disk timestamp
 542  * under HFSPLUS_UTC_OFFSET (Jan 1 1970) as a time between 2040 and 2106.
 543  */
 544 #define HFSPLUS_UTC_OFFSET 2082844800U
 545
 546 static inline time64_t __hfsp_mt2ut(__be32 mt)
 547 {
 548         time64_t ut = (u32)(be32_to_cpu(mt) - HFSPLUS_UTC_OFFSET);
 549
 550         return ut;
 551 }
 552
 553 static inline __be32 __hfsp_ut2mt(time64_t ut)
 554 {
 555         return cpu_to_be32(lower_32_bits(ut) + HFSPLUS_UTC_OFFSET);
 556 }
 557
 558 /* compatibility */
 559 #define hfsp_mt2ut(t)           (struct timespec64){ .tv_sec = __hfsp_mt2ut(t) }
 560 #define hfsp_ut2mt(t)           __hfsp_ut2mt((t).tv_sec)
 561 #define hfsp_now2mt()           __hfsp_ut2mt(ktime_get_real_seconds())
 562
 563 #endif