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