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 #define DBG_ACL_MOD     0x00000100
  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[0];
 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  * HFS+ superblock info (built from Volume Header on disk)
 131  */
 132
 133 struct hfsplus_vh;
 134 struct hfs_btree;
 135
 136 struct hfsplus_sb_info {
 137         void *s_vhdr_buf;
 138         struct hfsplus_vh *s_vhdr;
 139         void *s_backup_vhdr_buf;
 140         struct hfsplus_vh *s_backup_vhdr;
 141         struct hfs_btree *ext_tree;
 142         struct hfs_btree *cat_tree;
 143         struct hfs_btree *attr_tree;
 144         struct inode *alloc_file;
 145         struct inode *hidden_dir;
 146         struct nls_table *nls;
 147
 148         /* Runtime variables */
 149         u32 blockoffset;
 150         sector_t part_start;
 151         sector_t sect_count;
 152         int fs_shift;
 153
 154         /* immutable data from the volume header */
 155         u32 alloc_blksz;
 156         int alloc_blksz_shift;
 157         u32 total_blocks;
 158         u32 data_clump_blocks, rsrc_clump_blocks;
 159
 160         /* mutable data from the volume header, protected by alloc_mutex */
 161         u32 free_blocks;
 162         struct mutex alloc_mutex;
 163
 164         /* mutable data from the volume header, protected by vh_mutex */
 165         u32 next_cnid;
 166         u32 file_count;
 167         u32 folder_count;
 168         struct mutex vh_mutex;
 169
 170         /* Config options */
 171         u32 creator;
 172         u32 type;
 173
 174         umode_t umask;
 175         kuid_t uid;
 176         kgid_t gid;
 177
 178         int part, session;
 179         unsigned long flags;
 180
 181         int work_queued;               /* non-zero delayed work is queued */
 182         struct delayed_work sync_work; /* FS sync delayed work */
 183         spinlock_t work_lock;          /* protects sync_work and work_queued */
 184 };
 185
 186 #define HFSPLUS_SB_WRITEBACKUP  0
 187 #define HFSPLUS_SB_NODECOMPOSE  1
 188 #define HFSPLUS_SB_FORCE        2
 189 #define HFSPLUS_SB_HFSX         3
 190 #define HFSPLUS_SB_CASEFOLD     4
 191 #define HFSPLUS_SB_NOBARRIER    5
 192
 193 static inline struct hfsplus_sb_info *HFSPLUS_SB(struct super_block *sb)
 194 {
 195         return sb->s_fs_info;
 196 }
 197
 198
 199 struct hfsplus_inode_info {
 200         atomic_t opencnt;
 201
 202         /*
 203          * Extent allocation information, protected by extents_lock.
 204          */
 205         u32 first_blocks;
 206         u32 clump_blocks;
 207         u32 alloc_blocks;
 208         u32 cached_start;
 209         u32 cached_blocks;
 210         hfsplus_extent_rec first_extents;
 211         hfsplus_extent_rec cached_extents;
 212         unsigned int extent_state;
 213         struct mutex extents_lock;
 214
 215         /*
 216          * Immutable data.
 217          */
 218         struct inode *rsrc_inode;
 219         __be32 create_date;
 220
 221         /*
 222          * Protected by sbi->vh_mutex.
 223          */
 224         u32 linkid;
 225
 226         /*
 227          * Accessed using atomic bitops.
 228          */
 229         unsigned long flags;
 230
 231         /*
 232          * Protected by i_mutex.
 233          */
 234         sector_t fs_blocks;
 235         u8 userflags;           /* BSD user file flags */
 236         struct list_head open_dir_list;
 237         loff_t phys_size;
 238
 239         struct inode vfs_inode;
 240 };
 241
 242 #define HFSPLUS_EXT_DIRTY       0x0001
 243 #define HFSPLUS_EXT_NEW         0x0002
 244
 245 #define HFSPLUS_I_RSRC          0       /* represents a resource fork */
 246 #define HFSPLUS_I_CAT_DIRTY     1       /* has changes in the catalog tree */
 247 #define HFSPLUS_I_EXT_DIRTY     2       /* has changes in the extent tree */
 248 #define HFSPLUS_I_ALLOC_DIRTY   3       /* has changes in the allocation file */
 249 #define HFSPLUS_I_ATTR_DIRTY    4       /* has changes in the attributes tree */
 250
 251 #define HFSPLUS_IS_RSRC(inode) \
 252         test_bit(HFSPLUS_I_RSRC, &HFSPLUS_I(inode)->flags)
 253
 254 static inline struct hfsplus_inode_info *HFSPLUS_I(struct inode *inode)
 255 {
 256         return list_entry(inode, struct hfsplus_inode_info, vfs_inode);
 257 }
 258
 259 /*
 260  * Mark an inode dirty, and also mark the btree in which the
 261  * specific type of metadata is stored.
 262  * For data or metadata that gets written back by into the catalog btree
 263  * by hfsplus_write_inode a plain mark_inode_dirty call is enough.
 264  */
 265 static inline void hfsplus_mark_inode_dirty(struct inode *inode,
 266                 unsigned int flag)
 267 {
 268         set_bit(flag, &HFSPLUS_I(inode)->flags);
 269         mark_inode_dirty(inode);
 270 }
 271
 272 struct hfs_find_data {
 273         /* filled by caller */
 274         hfsplus_btree_key *search_key;
 275         hfsplus_btree_key *key;
 276         /* filled by find */
 277         struct hfs_btree *tree;
 278         struct hfs_bnode *bnode;
 279         /* filled by findrec */
 280         int record;
 281         int keyoffset, keylength;
 282         int entryoffset, entrylength;
 283 };
 284
 285 struct hfsplus_readdir_data {
 286         struct list_head list;
 287         struct file *file;
 288         struct hfsplus_cat_key key;
 289 };
 290
 291 /*
 292  * Find minimum acceptible I/O size for an hfsplus sb.
 293  */
 294 static inline unsigned short hfsplus_min_io_size(struct super_block *sb)
 295 {
 296         return max_t(unsigned short, bdev_logical_block_size(sb->s_bdev),
 297                      HFSPLUS_SECTOR_SIZE);
 298 }
 299
 300 #define hfs_btree_open hfsplus_btree_open
 301 #define hfs_btree_close hfsplus_btree_close
 302 #define hfs_btree_write hfsplus_btree_write
 303 #define hfs_bmap_alloc hfsplus_bmap_alloc
 304 #define hfs_bmap_free hfsplus_bmap_free
 305 #define hfs_bnode_read hfsplus_bnode_read
 306 #define hfs_bnode_read_u16 hfsplus_bnode_read_u16
 307 #define hfs_bnode_read_u8 hfsplus_bnode_read_u8
 308 #define hfs_bnode_read_key hfsplus_bnode_read_key
 309 #define hfs_bnode_write hfsplus_bnode_write
 310 #define hfs_bnode_write_u16 hfsplus_bnode_write_u16
 311 #define hfs_bnode_clear hfsplus_bnode_clear
 312 #define hfs_bnode_copy hfsplus_bnode_copy
 313 #define hfs_bnode_move hfsplus_bnode_move
 314 #define hfs_bnode_dump hfsplus_bnode_dump
 315 #define hfs_bnode_unlink hfsplus_bnode_unlink
 316 #define hfs_bnode_findhash hfsplus_bnode_findhash
 317 #define hfs_bnode_find hfsplus_bnode_find
 318 #define hfs_bnode_unhash hfsplus_bnode_unhash
 319 #define hfs_bnode_free hfsplus_bnode_free
 320 #define hfs_bnode_create hfsplus_bnode_create
 321 #define hfs_bnode_get hfsplus_bnode_get
 322 #define hfs_bnode_put hfsplus_bnode_put
 323 #define hfs_brec_lenoff hfsplus_brec_lenoff
 324 #define hfs_brec_keylen hfsplus_brec_keylen
 325 #define hfs_brec_insert hfsplus_brec_insert
 326 #define hfs_brec_remove hfsplus_brec_remove
 327 #define hfs_find_init hfsplus_find_init
 328 #define hfs_find_exit hfsplus_find_exit
 329 #define __hfs_brec_find __hfsplus_brec_find
 330 #define hfs_brec_find hfsplus_brec_find
 331 #define hfs_brec_read hfsplus_brec_read
 332 #define hfs_brec_goto hfsplus_brec_goto
 333 #define hfs_part_find hfsplus_part_find
 334
 335 /*
 336  * definitions for ext2 flag ioctls (linux really needs a generic
 337  * interface for this).
 338  */
 339
 340 /* ext2 ioctls (EXT2_IOC_GETFLAGS and EXT2_IOC_SETFLAGS) to support
 341  * chattr/lsattr */
 342 #define HFSPLUS_IOC_EXT2_GETFLAGS       FS_IOC_GETFLAGS
 343 #define HFSPLUS_IOC_EXT2_SETFLAGS       FS_IOC_SETFLAGS
 344
 345
 346 /*
 347  * hfs+-specific ioctl for making the filesystem bootable
 348  */
 349 #define HFSPLUS_IOC_BLESS _IO('h', 0x80)
 350
 351 typedef int (*search_strategy_t)(struct hfs_bnode *,
 352                                 struct hfs_find_data *,
 353                                 int *, int *, int *);
 354
 355 /*
 356  * Functions in any *.c used in other files
 357  */
 358
 359 /* attributes.c */
 360 int hfsplus_create_attr_tree_cache(void);
 361 void hfsplus_destroy_attr_tree_cache(void);
 362 hfsplus_attr_entry *hfsplus_alloc_attr_entry(void);
 363 void hfsplus_destroy_attr_entry(hfsplus_attr_entry *entry_p);
 364 int hfsplus_attr_bin_cmp_key(const hfsplus_btree_key *,
 365                 const hfsplus_btree_key *);
 366 int hfsplus_attr_build_key(struct super_block *, hfsplus_btree_key *,
 367                         u32, const char *);
 368 void hfsplus_attr_build_key_uni(hfsplus_btree_key *key,
 369                                         u32 cnid,
 370                                         struct hfsplus_attr_unistr *name);
 371 int hfsplus_find_attr(struct super_block *, u32,
 372                         const char *, struct hfs_find_data *);
 373 int hfsplus_attr_exists(struct inode *inode, const char *name);
 374 int hfsplus_create_attr(struct inode *, const char *, const void *, size_t);
 375 int hfsplus_delete_attr(struct inode *, const char *);
 376 int hfsplus_delete_all_attrs(struct inode *dir, u32 cnid);
 377
 378 /* bitmap.c */
 379 int hfsplus_block_allocate(struct super_block *, u32, u32, u32 *);
 380 int hfsplus_block_free(struct super_block *, u32, u32);
 381
 382 /* btree.c */
 383 struct hfs_btree *hfs_btree_open(struct super_block *, u32);
 384 void hfs_btree_close(struct hfs_btree *);
 385 int hfs_btree_write(struct hfs_btree *);
 386 struct hfs_bnode *hfs_bmap_alloc(struct hfs_btree *);
 387 void hfs_bmap_free(struct hfs_bnode *);
 388
 389 /* bnode.c */
 390 void hfs_bnode_read(struct hfs_bnode *, void *, int, int);
 391 u16 hfs_bnode_read_u16(struct hfs_bnode *, int);
 392 u8 hfs_bnode_read_u8(struct hfs_bnode *, int);
 393 void hfs_bnode_read_key(struct hfs_bnode *, void *, int);
 394 void hfs_bnode_write(struct hfs_bnode *, void *, int, int);
 395 void hfs_bnode_write_u16(struct hfs_bnode *, int, u16);
 396 void hfs_bnode_clear(struct hfs_bnode *, int, int);
 397 void hfs_bnode_copy(struct hfs_bnode *, int,
 398                     struct hfs_bnode *, int, int);
 399 void hfs_bnode_move(struct hfs_bnode *, int, int, int);
 400 void hfs_bnode_dump(struct hfs_bnode *);
 401 void hfs_bnode_unlink(struct hfs_bnode *);
 402 struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *, u32);
 403 struct hfs_bnode *hfs_bnode_find(struct hfs_btree *, u32);
 404 void hfs_bnode_unhash(struct hfs_bnode *);
 405 void hfs_bnode_free(struct hfs_bnode *);
 406 struct hfs_bnode *hfs_bnode_create(struct hfs_btree *, u32);
 407 void hfs_bnode_get(struct hfs_bnode *);
 408 void hfs_bnode_put(struct hfs_bnode *);
 409
 410 /* brec.c */
 411 u16 hfs_brec_lenoff(struct hfs_bnode *, u16, u16 *);
 412 u16 hfs_brec_keylen(struct hfs_bnode *, u16);
 413 int hfs_brec_insert(struct hfs_find_data *, void *, int);
 414 int hfs_brec_remove(struct hfs_find_data *);
 415
 416 /* bfind.c */
 417 int hfs_find_init(struct hfs_btree *, struct hfs_find_data *);
 418 void hfs_find_exit(struct hfs_find_data *);
 419 int hfs_find_1st_rec_by_cnid(struct hfs_bnode *,
 420                                 struct hfs_find_data *,
 421                                 int *, int *, int *);
 422 int hfs_find_rec_by_key(struct hfs_bnode *,
 423                                 struct hfs_find_data *,
 424                                 int *, int *, int *);
 425 int __hfs_brec_find(struct hfs_bnode *, struct hfs_find_data *,
 426                                 search_strategy_t);
 427 int hfs_brec_find(struct hfs_find_data *, search_strategy_t);
 428 int hfs_brec_read(struct hfs_find_data *, void *, int);
 429 int hfs_brec_goto(struct hfs_find_data *, int);
 430
 431 /* catalog.c */
 432 int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *,
 433                 const hfsplus_btree_key *);
 434 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *,
 435                 const hfsplus_btree_key *);
 436 void hfsplus_cat_build_key(struct super_block *sb,
 437                 hfsplus_btree_key *, u32, struct qstr *);
 438 int hfsplus_find_cat(struct super_block *, u32, struct hfs_find_data *);
 439 int hfsplus_create_cat(u32, struct inode *, struct qstr *, struct inode *);
 440 int hfsplus_delete_cat(u32, struct inode *, struct qstr *);
 441 int hfsplus_rename_cat(u32, struct inode *, struct qstr *,
 442                        struct inode *, struct qstr *);
 443 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms);
 444
 445 /* dir.c */
 446 extern const struct inode_operations hfsplus_dir_inode_operations;
 447 extern const struct file_operations hfsplus_dir_operations;
 448
 449 /* extents.c */
 450 int hfsplus_ext_cmp_key(const hfsplus_btree_key *, const hfsplus_btree_key *);
 451 int hfsplus_ext_write_extent(struct inode *);
 452 int hfsplus_get_block(struct inode *, sector_t, struct buffer_head *, int);
 453 int hfsplus_free_fork(struct super_block *, u32,
 454                 struct hfsplus_fork_raw *, int);
 455 int hfsplus_file_extend(struct inode *);
 456 void hfsplus_file_truncate(struct inode *);
 457
 458 /* inode.c */
 459 extern const struct address_space_operations hfsplus_aops;
 460 extern const struct address_space_operations hfsplus_btree_aops;
 461 extern const struct dentry_operations hfsplus_dentry_operations;
 462
 463 void hfsplus_inode_read_fork(struct inode *, struct hfsplus_fork_raw *);
 464 void hfsplus_inode_write_fork(struct inode *, struct hfsplus_fork_raw *);
 465 int hfsplus_cat_read_inode(struct inode *, struct hfs_find_data *);
 466 int hfsplus_cat_write_inode(struct inode *);
 467 struct inode *hfsplus_new_inode(struct super_block *, umode_t);
 468 void hfsplus_delete_inode(struct inode *);
 469 int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
 470                        int datasync);
 471
 472 /* ioctl.c */
 473 long hfsplus_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
 474
 475 /* options.c */
 476 int hfsplus_parse_options(char *, struct hfsplus_sb_info *);
 477 int hfsplus_parse_options_remount(char *input, int *force);
 478 void hfsplus_fill_defaults(struct hfsplus_sb_info *);
 479 int hfsplus_show_options(struct seq_file *, struct dentry *);
 480
 481 /* super.c */
 482 struct inode *hfsplus_iget(struct super_block *, unsigned long);
 483 void hfsplus_mark_mdb_dirty(struct super_block *sb);
 484
 485 /* tables.c */
 486 extern u16 hfsplus_case_fold_table[];
 487 extern u16 hfsplus_decompose_table[];
 488 extern u16 hfsplus_compose_table[];
 489
 490 /* unicode.c */
 491 int hfsplus_strcasecmp(const struct hfsplus_unistr *,
 492                 const struct hfsplus_unistr *);
 493 int hfsplus_strcmp(const struct hfsplus_unistr *,
 494                 const struct hfsplus_unistr *);
 495 int hfsplus_uni2asc(struct super_block *,
 496                 const struct hfsplus_unistr *, char *, int *);
 497 int hfsplus_asc2uni(struct super_block *,
 498                 struct hfsplus_unistr *, int, const char *, int);
 499 int hfsplus_hash_dentry(const struct dentry *dentry, struct qstr *str);
 500 int hfsplus_compare_dentry(const struct dentry *parent, const struct dentry *dentry,
 501                 unsigned int len, const char *str, const struct qstr *name);
 502
 503 /* wrapper.c */
 504 int hfsplus_read_wrapper(struct super_block *);
 505 int hfs_part_find(struct super_block *, sector_t *, sector_t *);
 506 int hfsplus_submit_bio(struct super_block *sb, sector_t sector,
 507                 void *buf, void **data, int rw);
 508
 509 /* time macros */
 510 #define __hfsp_mt2ut(t)         (be32_to_cpu(t) - 2082844800U)
 511 #define __hfsp_ut2mt(t)         (cpu_to_be32(t + 2082844800U))
 512
 513 /* compatibility */
 514 #define hfsp_mt2ut(t)           (struct timespec){ .tv_sec = __hfsp_mt2ut(t) }
 515 #define hfsp_ut2mt(t)           __hfsp_ut2mt((t).tv_sec)
 516 #define hfsp_now2mt()           __hfsp_ut2mt(get_seconds())
 517
 518 #endif