fs/hfsplus/hfsplus_fs.h

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