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         struct rcu_head rcu;
 194 };
 195
 196 #define HFSPLUS_SB_WRITEBACKUP  0
 197 #define HFSPLUS_SB_NODECOMPOSE  1
 198 #define HFSPLUS_SB_FORCE        2
 199 #define HFSPLUS_SB_HFSX         3
 200 #define HFSPLUS_SB_CASEFOLD     4
 201 #define HFSPLUS_SB_NOBARRIER    5
 202 #define HFSPLUS_SB_UID          6
 203 #define HFSPLUS_SB_GID          7
 204
 205 static inline struct hfsplus_sb_info *HFSPLUS_SB(struct super_block *sb)
 206 {
 207         return sb->s_fs_info;
 208 }
 209
 210
 211 struct hfsplus_inode_info {
 212         atomic_t opencnt;
 213
 214         /*
 215          * Extent allocation information, protected by extents_lock.
 216          */
 217         u32 first_blocks;
 218         u32 clump_blocks;
 219         u32 alloc_blocks;
 220         u32 cached_start;
 221         u32 cached_blocks;
 222         hfsplus_extent_rec first_extents;
 223         hfsplus_extent_rec cached_extents;
 224         unsigned int extent_state;
 225         struct mutex extents_lock;
 226
 227         /*
 228          * Immutable data.
 229          */
 230         struct inode *rsrc_inode;
 231         __be32 create_date;
 232
 233         /*
 234          * Protected by sbi->vh_mutex.
 235          */
 236         u32 linkid;
 237
 238         /*
 239          * Accessed using atomic bitops.
 240          */
 241         unsigned long flags;
 242
 243         /*
 244          * Protected by i_mutex.
 245          */
 246         sector_t fs_blocks;
 247         u8 userflags;           /* BSD user file flags */
 248         u32 subfolders;         /* Subfolder count (HFSX only) */
 249         struct list_head open_dir_list;
 250         spinlock_t open_dir_lock;
 251         loff_t phys_size;
 252
 253         struct inode vfs_inode;
 254 };
 255
 256 #define HFSPLUS_EXT_DIRTY       0x0001
 257 #define HFSPLUS_EXT_NEW         0x0002
 258
 259 #define HFSPLUS_I_RSRC          0       /* represents a resource fork */
 260 #define HFSPLUS_I_CAT_DIRTY     1       /* has changes in the catalog tree */
 261 #define HFSPLUS_I_EXT_DIRTY     2       /* has changes in the extent tree */
 262 #define HFSPLUS_I_ALLOC_DIRTY   3       /* has changes in the allocation file */
 263 #define HFSPLUS_I_ATTR_DIRTY    4       /* has changes in the attributes tree */
 264
 265 #define HFSPLUS_IS_RSRC(inode) \
 266         test_bit(HFSPLUS_I_RSRC, &HFSPLUS_I(inode)->flags)
 267
 268 static inline struct hfsplus_inode_info *HFSPLUS_I(struct inode *inode)
 269 {
 270         return container_of(inode, struct hfsplus_inode_info, vfs_inode);
 271 }
 272
 273 /*
 274  * Mark an inode dirty, and also mark the btree in which the
 275  * specific type of metadata is stored.
 276  * For data or metadata that gets written back by into the catalog btree
 277  * by hfsplus_write_inode a plain mark_inode_dirty call is enough.
 278  */
 279 static inline void hfsplus_mark_inode_dirty(struct inode *inode,
 280                 unsigned int flag)
 281 {
 282         set_bit(flag, &HFSPLUS_I(inode)->flags);
 283         mark_inode_dirty(inode);
 284 }
 285
 286 struct hfs_find_data {
 287         /* filled by caller */
 288         hfsplus_btree_key *search_key;
 289         hfsplus_btree_key *key;
 290         /* filled by find */
 291         struct hfs_btree *tree;
 292         struct hfs_bnode *bnode;
 293         /* filled by findrec */
 294         int record;
 295         int keyoffset, keylength;
 296         int entryoffset, entrylength;
 297 };
 298
 299 struct hfsplus_readdir_data {
 300         struct list_head list;
 301         struct file *file;
 302         struct hfsplus_cat_key key;
 303 };
 304
 305 /*
 306  * Find minimum acceptible I/O size for an hfsplus sb.
 307  */
 308 static inline unsigned short hfsplus_min_io_size(struct super_block *sb)
 309 {
 310         return max_t(unsigned short, bdev_logical_block_size(sb->s_bdev),
 311                      HFSPLUS_SECTOR_SIZE);
 312 }
 313
 314 #define hfs_btree_open hfsplus_btree_open
 315 #define hfs_btree_close hfsplus_btree_close
 316 #define hfs_btree_write hfsplus_btree_write
 317 #define hfs_bmap_reserve hfsplus_bmap_reserve
 318 #define hfs_bmap_alloc hfsplus_bmap_alloc
 319 #define hfs_bmap_free hfsplus_bmap_free
 320 #define hfs_bnode_read hfsplus_bnode_read
 321 #define hfs_bnode_read_u16 hfsplus_bnode_read_u16
 322 #define hfs_bnode_read_u8 hfsplus_bnode_read_u8
 323 #define hfs_bnode_read_key hfsplus_bnode_read_key
 324 #define hfs_bnode_write hfsplus_bnode_write
 325 #define hfs_bnode_write_u16 hfsplus_bnode_write_u16
 326 #define hfs_bnode_clear hfsplus_bnode_clear
 327 #define hfs_bnode_copy hfsplus_bnode_copy
 328 #define hfs_bnode_move hfsplus_bnode_move
 329 #define hfs_bnode_dump hfsplus_bnode_dump
 330 #define hfs_bnode_unlink hfsplus_bnode_unlink
 331 #define hfs_bnode_findhash hfsplus_bnode_findhash
 332 #define hfs_bnode_find hfsplus_bnode_find
 333 #define hfs_bnode_unhash hfsplus_bnode_unhash
 334 #define hfs_bnode_free hfsplus_bnode_free
 335 #define hfs_bnode_create hfsplus_bnode_create
 336 #define hfs_bnode_get hfsplus_bnode_get
 337 #define hfs_bnode_put hfsplus_bnode_put
 338 #define hfs_brec_lenoff hfsplus_brec_lenoff
 339 #define hfs_brec_keylen hfsplus_brec_keylen
 340 #define hfs_brec_insert hfsplus_brec_insert
 341 #define hfs_brec_remove hfsplus_brec_remove
 342 #define hfs_find_init hfsplus_find_init
 343 #define hfs_find_exit hfsplus_find_exit
 344 #define __hfs_brec_find __hfsplus_brec_find
 345 #define hfs_brec_find hfsplus_brec_find
 346 #define hfs_brec_read hfsplus_brec_read
 347 #define hfs_brec_goto hfsplus_brec_goto
 348 #define hfs_part_find hfsplus_part_find
 349
 350 /*
 351  * hfs+-specific ioctl for making the filesystem bootable
 352  */
 353 #define HFSPLUS_IOC_BLESS _IO('h', 0x80)
 354
 355 typedef int (*search_strategy_t)(struct hfs_bnode *,
 356                                 struct hfs_find_data *,
 357                                 int *, int *, int *);
 358
 359 /*
 360  * Functions in any *.c used in other files
 361  */
 362
 363 /* attributes.c */
 364 int __init hfsplus_create_attr_tree_cache(void);
 365 void hfsplus_destroy_attr_tree_cache(void);
 366 int hfsplus_attr_bin_cmp_key(const hfsplus_btree_key *k1,
 367                              const hfsplus_btree_key *k2);
 368 int hfsplus_attr_build_key(struct super_block *sb, hfsplus_btree_key *key,
 369                            u32 cnid, const char *name);
 370 hfsplus_attr_entry *hfsplus_alloc_attr_entry(void);
 371 void hfsplus_destroy_attr_entry(hfsplus_attr_entry *entry);
 372 int hfsplus_find_attr(struct super_block *sb, u32 cnid, const char *name,
 373                       struct hfs_find_data *fd);
 374 int hfsplus_attr_exists(struct inode *inode, const char *name);
 375 int hfsplus_create_attr(struct inode *inode, const char *name,
 376                         const void *value, size_t size);
 377 int hfsplus_delete_attr(struct inode *inode, const char *name);
 378 int hfsplus_delete_all_attrs(struct inode *dir, u32 cnid);
 379
 380 /* bitmap.c */
 381 int hfsplus_block_allocate(struct super_block *sb, u32 size, u32 offset,
 382                            u32 *max);
 383 int hfsplus_block_free(struct super_block *sb, u32 offset, u32 count);
 384
 385 /* btree.c */
 386 u32 hfsplus_calc_btree_clump_size(u32 block_size, u32 node_size, u64 sectors,
 387                                   int file_id);
 388 struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id);
 389 void hfs_btree_close(struct hfs_btree *tree);
 390 int hfs_btree_write(struct hfs_btree *tree);
 391 int hfs_bmap_reserve(struct hfs_btree *tree, int rsvd_nodes);
 392 struct hfs_bnode *hfs_bmap_alloc(struct hfs_btree *tree);
 393 void hfs_bmap_free(struct hfs_bnode *node);
 394
 395 /* bnode.c */
 396 void hfs_bnode_read(struct hfs_bnode *node, void *buf, int off, int len);
 397 u16 hfs_bnode_read_u16(struct hfs_bnode *node, int off);
 398 u8 hfs_bnode_read_u8(struct hfs_bnode *node, int off);
 399 void hfs_bnode_read_key(struct hfs_bnode *node, void *key, int off);
 400 void hfs_bnode_write(struct hfs_bnode *node, void *buf, int off, int len);
 401 void hfs_bnode_write_u16(struct hfs_bnode *node, int off, u16 data);
 402 void hfs_bnode_clear(struct hfs_bnode *node, int off, int len);
 403 void hfs_bnode_copy(struct hfs_bnode *dst_node, int dst,
 404                     struct hfs_bnode *src_node, int src, int len);
 405 void hfs_bnode_move(struct hfs_bnode *node, int dst, int src, int len);
 406 void hfs_bnode_dump(struct hfs_bnode *node);
 407 void hfs_bnode_unlink(struct hfs_bnode *node);
 408 struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *tree, u32 cnid);
 409 void hfs_bnode_unhash(struct hfs_bnode *node);
 410 struct hfs_bnode *hfs_bnode_find(struct hfs_btree *tree, u32 num);
 411 void hfs_bnode_free(struct hfs_bnode *node);
 412 struct hfs_bnode *hfs_bnode_create(struct hfs_btree *tree, u32 num);
 413 void hfs_bnode_get(struct hfs_bnode *node);
 414 void hfs_bnode_put(struct hfs_bnode *node);
 415 bool hfs_bnode_need_zeroout(struct hfs_btree *tree);
 416
 417 /* brec.c */
 418 u16 hfs_brec_lenoff(struct hfs_bnode *node, u16 rec, u16 *off);
 419 u16 hfs_brec_keylen(struct hfs_bnode *node, u16 rec);
 420 int hfs_brec_insert(struct hfs_find_data *fd, void *entry, int entry_len);
 421 int hfs_brec_remove(struct hfs_find_data *fd);
 422
 423 /* bfind.c */
 424 int hfs_find_init(struct hfs_btree *tree, struct hfs_find_data *fd);
 425 void hfs_find_exit(struct hfs_find_data *fd);
 426 int hfs_find_1st_rec_by_cnid(struct hfs_bnode *bnode, struct hfs_find_data *fd,
 427                              int *begin, int *end, int *cur_rec);
 428 int hfs_find_rec_by_key(struct hfs_bnode *bnode, struct hfs_find_data *fd,
 429                         int *begin, int *end, int *cur_rec);
 430 int __hfs_brec_find(struct hfs_bnode *bnode, struct hfs_find_data *fd,
 431                     search_strategy_t rec_found);
 432 int hfs_brec_find(struct hfs_find_data *fd, search_strategy_t do_key_compare);
 433 int hfs_brec_read(struct hfs_find_data *fd, void *rec, int rec_len);
 434 int hfs_brec_goto(struct hfs_find_data *fd, int cnt);
 435
 436 /* catalog.c */
 437 int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
 438                              const hfsplus_btree_key *k2);
 439 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
 440                             const hfsplus_btree_key *k2);
 441 int hfsplus_cat_build_key(struct super_block *sb, hfsplus_btree_key *key,
 442                            u32 parent, const struct qstr *str);
 443 void hfsplus_cat_build_key_with_cnid(struct super_block *sb,
 444                                      hfsplus_btree_key *key, u32 parent);
 445 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms);
 446 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
 447                      struct hfs_find_data *fd);
 448 int hfsplus_create_cat(u32 cnid, struct inode *dir, const struct qstr *str,
 449                        struct inode *inode);
 450 int hfsplus_delete_cat(u32 cnid, struct inode *dir, const struct qstr *str);
 451 int hfsplus_rename_cat(u32 cnid, struct inode *src_dir, const struct qstr *src_name,
 452                        struct inode *dst_dir, const struct qstr *dst_name);
 453
 454 /* dir.c */
 455 extern const struct inode_operations hfsplus_dir_inode_operations;
 456 extern const struct file_operations hfsplus_dir_operations;
 457
 458 /* extents.c */
 459 int hfsplus_ext_cmp_key(const hfsplus_btree_key *k1,
 460                         const hfsplus_btree_key *k2);
 461 int hfsplus_ext_write_extent(struct inode *inode);
 462 int hfsplus_get_block(struct inode *inode, sector_t iblock,
 463                       struct buffer_head *bh_result, int create);
 464 int hfsplus_free_fork(struct super_block *sb, u32 cnid,
 465                       struct hfsplus_fork_raw *fork, int type);
 466 int hfsplus_file_extend(struct inode *inode, bool zeroout);
 467 void hfsplus_file_truncate(struct inode *inode);
 468
 469 /* inode.c */
 470 extern const struct address_space_operations hfsplus_aops;
 471 extern const struct address_space_operations hfsplus_btree_aops;
 472 extern const struct dentry_operations hfsplus_dentry_operations;
 473
 474 int hfsplus_write_begin(struct file *file, struct address_space *mapping,
 475                 loff_t pos, unsigned len, struct folio **foliop, void **fsdata);
 476 struct inode *hfsplus_new_inode(struct super_block *sb, struct inode *dir,
 477                                 umode_t mode);
 478 void hfsplus_delete_inode(struct inode *inode);
 479 void hfsplus_inode_read_fork(struct inode *inode,
 480                              struct hfsplus_fork_raw *fork);
 481 void hfsplus_inode_write_fork(struct inode *inode,
 482                               struct hfsplus_fork_raw *fork);
 483 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd);
 484 int hfsplus_cat_write_inode(struct inode *inode);
 485 int hfsplus_getattr(struct mnt_idmap *idmap, const struct path *path,
 486                     struct kstat *stat, u32 request_mask,
 487                     unsigned int query_flags);
 488 int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
 489                        int datasync);
 490 int hfsplus_fileattr_get(struct dentry *dentry, struct fileattr *fa);
 491 int hfsplus_fileattr_set(struct mnt_idmap *idmap,
 492                          struct dentry *dentry, struct fileattr *fa);
 493
 494 /* ioctl.c */
 495 long hfsplus_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
 496
 497 /* options.c */
 498 void hfsplus_fill_defaults(struct hfsplus_sb_info *opts);
 499 int hfsplus_parse_options_remount(char *input, int *force);
 500 int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi);
 501 int hfsplus_show_options(struct seq_file *seq, struct dentry *root);
 502
 503 /* part_tbl.c */
 504 int hfs_part_find(struct super_block *sb, sector_t *part_start,
 505                   sector_t *part_size);
 506
 507 /* super.c */
 508 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino);
 509 void hfsplus_mark_mdb_dirty(struct super_block *sb);
 510
 511 /* tables.c */
 512 extern u16 hfsplus_case_fold_table[];
 513 extern u16 hfsplus_decompose_table[];
 514 extern u16 hfsplus_compose_table[];
 515
 516 /* unicode.c */
 517 int hfsplus_strcasecmp(const struct hfsplus_unistr *s1,
 518                        const struct hfsplus_unistr *s2);
 519 int hfsplus_strcmp(const struct hfsplus_unistr *s1,
 520                    const struct hfsplus_unistr *s2);
 521 int hfsplus_uni2asc(struct super_block *sb, const struct hfsplus_unistr *ustr,
 522                     char *astr, int *len_p);
 523 int hfsplus_asc2uni(struct super_block *sb, struct hfsplus_unistr *ustr,
 524                     int max_unistr_len, const char *astr, int len);
 525 int hfsplus_hash_dentry(const struct dentry *dentry, struct qstr *str);
 526 int hfsplus_compare_dentry(const struct dentry *dentry, unsigned int len,
 527                            const char *str, const struct qstr *name);
 528
 529 /* wrapper.c */
 530 int hfsplus_submit_bio(struct super_block *sb, sector_t sector, void *buf,
 531                        void **data, blk_opf_t opf);
 532 int hfsplus_read_wrapper(struct super_block *sb);
 533
 534 /*
 535  * time helpers: convert between 1904-base and 1970-base timestamps
 536  *
 537  * HFS+ implementations are highly inconsistent, this one matches the
 538  * traditional behavior of 64-bit Linux, giving the most useful
 539  * time range between 1970 and 2106, by treating any on-disk timestamp
 540  * under HFSPLUS_UTC_OFFSET (Jan 1 1970) as a time between 2040 and 2106.
 541  */
 542 #define HFSPLUS_UTC_OFFSET 2082844800U
 543
 544 static inline time64_t __hfsp_mt2ut(__be32 mt)
 545 {
 546         time64_t ut = (u32)(be32_to_cpu(mt) - HFSPLUS_UTC_OFFSET);
 547
 548         return ut;
 549 }
 550
 551 static inline __be32 __hfsp_ut2mt(time64_t ut)
 552 {
 553         return cpu_to_be32(lower_32_bits(ut) + HFSPLUS_UTC_OFFSET);
 554 }
 555
 556 static inline enum hfsplus_btree_mutex_classes
 557 hfsplus_btree_lock_class(struct hfs_btree *tree)
 558 {
 559         enum hfsplus_btree_mutex_classes class;
 560
 561         switch (tree->cnid) {
 562         case HFSPLUS_CAT_CNID:
 563                 class = CATALOG_BTREE_MUTEX;
 564                 break;
 565         case HFSPLUS_EXT_CNID:
 566                 class = EXTENTS_BTREE_MUTEX;
 567                 break;
 568         case HFSPLUS_ATTR_CNID:
 569                 class = ATTR_BTREE_MUTEX;
 570                 break;
 571         default:
 572                 BUG();
 573         }
 574         return class;
 575 }
 576
 577 /* compatibility */
 578 #define hfsp_mt2ut(t)           (struct timespec64){ .tv_sec = __hfsp_mt2ut(t) }
 579 #define hfsp_ut2mt(t)           __hfsp_ut2mt((t).tv_sec)
 580 #define hfsp_now2mt()           __hfsp_ut2mt(ktime_get_real_seconds())
 581
 582 #endif