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