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TOMOYO Linux Cross Reference
Linux/fs/hfsplus/hfsplus_fs.h

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  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  * 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 };
194 
195 #define HFSPLUS_SB_WRITEBACKUP  0
196 #define HFSPLUS_SB_NODECOMPOSE  1
197 #define HFSPLUS_SB_FORCE        2
198 #define HFSPLUS_SB_HFSX         3
199 #define HFSPLUS_SB_CASEFOLD     4
200 #define HFSPLUS_SB_NOBARRIER    5
201 
202 static inline struct hfsplus_sb_info *HFSPLUS_SB(struct super_block *sb)
203 {
204         return sb->s_fs_info;
205 }
206 
207 
208 struct hfsplus_inode_info {
209         atomic_t opencnt;
210 
211         /*
212          * Extent allocation information, protected by extents_lock.
213          */
214         u32 first_blocks;
215         u32 clump_blocks;
216         u32 alloc_blocks;
217         u32 cached_start;
218         u32 cached_blocks;
219         hfsplus_extent_rec first_extents;
220         hfsplus_extent_rec cached_extents;
221         unsigned int extent_state;
222         struct mutex extents_lock;
223 
224         /*
225          * Immutable data.
226          */
227         struct inode *rsrc_inode;
228         __be32 create_date;
229 
230         /*
231          * Protected by sbi->vh_mutex.
232          */
233         u32 linkid;
234 
235         /*
236          * Accessed using atomic bitops.
237          */
238         unsigned long flags;
239 
240         /*
241          * Protected by i_mutex.
242          */
243         sector_t fs_blocks;
244         u8 userflags;           /* BSD user file flags */
245         u32 subfolders;         /* Subfolder count (HFSX only) */
246         struct list_head open_dir_list;
247         spinlock_t open_dir_lock;
248         loff_t phys_size;
249 
250         struct inode vfs_inode;
251 };
252 
253 #define HFSPLUS_EXT_DIRTY       0x0001
254 #define HFSPLUS_EXT_NEW         0x0002
255 
256 #define HFSPLUS_I_RSRC          0       /* represents a resource fork */
257 #define HFSPLUS_I_CAT_DIRTY     1       /* has changes in the catalog tree */
258 #define HFSPLUS_I_EXT_DIRTY     2       /* has changes in the extent tree */
259 #define HFSPLUS_I_ALLOC_DIRTY   3       /* has changes in the allocation file */
260 #define HFSPLUS_I_ATTR_DIRTY    4       /* has changes in the attributes tree */
261 
262 #define HFSPLUS_IS_RSRC(inode) \
263         test_bit(HFSPLUS_I_RSRC, &HFSPLUS_I(inode)->flags)
264 
265 static inline struct hfsplus_inode_info *HFSPLUS_I(struct inode *inode)
266 {
267         return container_of(inode, struct hfsplus_inode_info, vfs_inode);
268 }
269 
270 /*
271  * Mark an inode dirty, and also mark the btree in which the
272  * specific type of metadata is stored.
273  * For data or metadata that gets written back by into the catalog btree
274  * by hfsplus_write_inode a plain mark_inode_dirty call is enough.
275  */
276 static inline void hfsplus_mark_inode_dirty(struct inode *inode,
277                 unsigned int flag)
278 {
279         set_bit(flag, &HFSPLUS_I(inode)->flags);
280         mark_inode_dirty(inode);
281 }
282 
283 struct hfs_find_data {
284         /* filled by caller */
285         hfsplus_btree_key *search_key;
286         hfsplus_btree_key *key;
287         /* filled by find */
288         struct hfs_btree *tree;
289         struct hfs_bnode *bnode;
290         /* filled by findrec */
291         int record;
292         int keyoffset, keylength;
293         int entryoffset, entrylength;
294 };
295 
296 struct hfsplus_readdir_data {
297         struct list_head list;
298         struct file *file;
299         struct hfsplus_cat_key key;
300 };
301 
302 /*
303  * Find minimum acceptible I/O size for an hfsplus sb.
304  */
305 static inline unsigned short hfsplus_min_io_size(struct super_block *sb)
306 {
307         return max_t(unsigned short, bdev_logical_block_size(sb->s_bdev),
308                      HFSPLUS_SECTOR_SIZE);
309 }
310 
311 #define hfs_btree_open hfsplus_btree_open
312 #define hfs_btree_close hfsplus_btree_close
313 #define hfs_btree_write hfsplus_btree_write
314 #define hfs_bmap_alloc hfsplus_bmap_alloc
315 #define hfs_bmap_free hfsplus_bmap_free
316 #define hfs_bnode_read hfsplus_bnode_read
317 #define hfs_bnode_read_u16 hfsplus_bnode_read_u16
318 #define hfs_bnode_read_u8 hfsplus_bnode_read_u8
319 #define hfs_bnode_read_key hfsplus_bnode_read_key
320 #define hfs_bnode_write hfsplus_bnode_write
321 #define hfs_bnode_write_u16 hfsplus_bnode_write_u16
322 #define hfs_bnode_clear hfsplus_bnode_clear
323 #define hfs_bnode_copy hfsplus_bnode_copy
324 #define hfs_bnode_move hfsplus_bnode_move
325 #define hfs_bnode_dump hfsplus_bnode_dump
326 #define hfs_bnode_unlink hfsplus_bnode_unlink
327 #define hfs_bnode_findhash hfsplus_bnode_findhash
328 #define hfs_bnode_find hfsplus_bnode_find
329 #define hfs_bnode_unhash hfsplus_bnode_unhash
330 #define hfs_bnode_free hfsplus_bnode_free
331 #define hfs_bnode_create hfsplus_bnode_create
332 #define hfs_bnode_get hfsplus_bnode_get
333 #define hfs_bnode_put hfsplus_bnode_put
334 #define hfs_brec_lenoff hfsplus_brec_lenoff
335 #define hfs_brec_keylen hfsplus_brec_keylen
336 #define hfs_brec_insert hfsplus_brec_insert
337 #define hfs_brec_remove hfsplus_brec_remove
338 #define hfs_find_init hfsplus_find_init
339 #define hfs_find_exit hfsplus_find_exit
340 #define __hfs_brec_find __hfsplus_brec_find
341 #define hfs_brec_find hfsplus_brec_find
342 #define hfs_brec_read hfsplus_brec_read
343 #define hfs_brec_goto hfsplus_brec_goto
344 #define hfs_part_find hfsplus_part_find
345 
346 /*
347  * definitions for ext2 flag ioctls (linux really needs a generic
348  * interface for this).
349  */
350 
351 /* ext2 ioctls (EXT2_IOC_GETFLAGS and EXT2_IOC_SETFLAGS) to support
352  * chattr/lsattr */
353 #define HFSPLUS_IOC_EXT2_GETFLAGS       FS_IOC_GETFLAGS
354 #define HFSPLUS_IOC_EXT2_SETFLAGS       FS_IOC_SETFLAGS
355 
356 
357 /*
358  * hfs+-specific ioctl for making the filesystem bootable
359  */
360 #define HFSPLUS_IOC_BLESS _IO('h', 0x80)
361 
362 typedef int (*search_strategy_t)(struct hfs_bnode *,
363                                 struct hfs_find_data *,
364                                 int *, int *, int *);
365 
366 /*
367  * Functions in any *.c used in other files
368  */
369 
370 /* attributes.c */
371 int __init hfsplus_create_attr_tree_cache(void);
372 void hfsplus_destroy_attr_tree_cache(void);
373 int hfsplus_attr_bin_cmp_key(const hfsplus_btree_key *k1,
374                              const hfsplus_btree_key *k2);
375 int hfsplus_attr_build_key(struct super_block *sb, hfsplus_btree_key *key,
376                            u32 cnid, const char *name);
377 hfsplus_attr_entry *hfsplus_alloc_attr_entry(void);
378 void hfsplus_destroy_attr_entry(hfsplus_attr_entry *entry);
379 int hfsplus_find_attr(struct super_block *sb, u32 cnid, const char *name,
380                       struct hfs_find_data *fd);
381 int hfsplus_attr_exists(struct inode *inode, const char *name);
382 int hfsplus_create_attr(struct inode *inode, const char *name,
383                         const void *value, size_t size);
384 int hfsplus_delete_attr(struct inode *inode, const char *name);
385 int hfsplus_delete_all_attrs(struct inode *dir, u32 cnid);
386 
387 /* bitmap.c */
388 int hfsplus_block_allocate(struct super_block *sb, u32 size, u32 offset,
389                            u32 *max);
390 int hfsplus_block_free(struct super_block *sb, u32 offset, u32 count);
391 
392 /* btree.c */
393 u32 hfsplus_calc_btree_clump_size(u32 block_size, u32 node_size, u64 sectors,
394                                   int file_id);
395 struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id);
396 void hfs_btree_close(struct hfs_btree *tree);
397 int hfs_btree_write(struct hfs_btree *tree);
398 struct hfs_bnode *hfs_bmap_alloc(struct hfs_btree *tree);
399 void hfs_bmap_free(struct hfs_bnode *node);
400 
401 /* bnode.c */
402 void hfs_bnode_read(struct hfs_bnode *node, void *buf, int off, int len);
403 u16 hfs_bnode_read_u16(struct hfs_bnode *node, int off);
404 u8 hfs_bnode_read_u8(struct hfs_bnode *node, int off);
405 void hfs_bnode_read_key(struct hfs_bnode *node, void *key, int off);
406 void hfs_bnode_write(struct hfs_bnode *node, void *buf, int off, int len);
407 void hfs_bnode_write_u16(struct hfs_bnode *node, int off, u16 data);
408 void hfs_bnode_clear(struct hfs_bnode *node, int off, int len);
409 void hfs_bnode_copy(struct hfs_bnode *dst_node, int dst,
410                     struct hfs_bnode *src_node, int src, int len);
411 void hfs_bnode_move(struct hfs_bnode *node, int dst, int src, int len);
412 void hfs_bnode_dump(struct hfs_bnode *node);
413 void hfs_bnode_unlink(struct hfs_bnode *node);
414 struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *tree, u32 cnid);
415 void hfs_bnode_unhash(struct hfs_bnode *node);
416 struct hfs_bnode *hfs_bnode_find(struct hfs_btree *tree, u32 num);
417 void hfs_bnode_free(struct hfs_bnode *node);
418 struct hfs_bnode *hfs_bnode_create(struct hfs_btree *tree, u32 num);
419 void hfs_bnode_get(struct hfs_bnode *node);
420 void hfs_bnode_put(struct hfs_bnode *node);
421 bool hfs_bnode_need_zeroout(struct hfs_btree *tree);
422 
423 /* brec.c */
424 u16 hfs_brec_lenoff(struct hfs_bnode *node, u16 rec, u16 *off);
425 u16 hfs_brec_keylen(struct hfs_bnode *node, u16 rec);
426 int hfs_brec_insert(struct hfs_find_data *fd, void *entry, int entry_len);
427 int hfs_brec_remove(struct hfs_find_data *fd);
428 
429 /* bfind.c */
430 int hfs_find_init(struct hfs_btree *tree, struct hfs_find_data *fd);
431 void hfs_find_exit(struct hfs_find_data *fd);
432 int hfs_find_1st_rec_by_cnid(struct hfs_bnode *bnode, struct hfs_find_data *fd,
433                              int *begin, int *end, int *cur_rec);
434 int hfs_find_rec_by_key(struct hfs_bnode *bnode, struct hfs_find_data *fd,
435                         int *begin, int *end, int *cur_rec);
436 int __hfs_brec_find(struct hfs_bnode *bnode, struct hfs_find_data *fd,
437                     search_strategy_t rec_found);
438 int hfs_brec_find(struct hfs_find_data *fd, search_strategy_t do_key_compare);
439 int hfs_brec_read(struct hfs_find_data *fd, void *rec, int rec_len);
440 int hfs_brec_goto(struct hfs_find_data *fd, int cnt);
441 
442 /* catalog.c */
443 int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
444                              const hfsplus_btree_key *k2);
445 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
446                             const hfsplus_btree_key *k2);
447 int hfsplus_cat_build_key(struct super_block *sb, hfsplus_btree_key *key,
448                            u32 parent, const struct qstr *str);
449 void hfsplus_cat_build_key_with_cnid(struct super_block *sb,
450                                      hfsplus_btree_key *key, u32 parent);
451 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms);
452 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
453                      struct hfs_find_data *fd);
454 int hfsplus_create_cat(u32 cnid, struct inode *dir, const struct qstr *str,
455                        struct inode *inode);
456 int hfsplus_delete_cat(u32 cnid, struct inode *dir, const struct qstr *str);
457 int hfsplus_rename_cat(u32 cnid, struct inode *src_dir, const struct qstr *src_name,
458                        struct inode *dst_dir, const struct qstr *dst_name);
459 
460 /* dir.c */
461 extern const struct inode_operations hfsplus_dir_inode_operations;
462 extern const struct file_operations hfsplus_dir_operations;
463 
464 /* extents.c */
465 int hfsplus_ext_cmp_key(const hfsplus_btree_key *k1,
466                         const hfsplus_btree_key *k2);
467 int hfsplus_ext_write_extent(struct inode *inode);
468 int hfsplus_get_block(struct inode *inode, sector_t iblock,
469                       struct buffer_head *bh_result, int create);
470 int hfsplus_free_fork(struct super_block *sb, u32 cnid,
471                       struct hfsplus_fork_raw *fork, int type);
472 int hfsplus_file_extend(struct inode *inode, bool zeroout);
473 void hfsplus_file_truncate(struct inode *inode);
474 
475 /* inode.c */
476 extern const struct address_space_operations hfsplus_aops;
477 extern const struct address_space_operations hfsplus_btree_aops;
478 extern const struct dentry_operations hfsplus_dentry_operations;
479 
480 struct inode *hfsplus_new_inode(struct super_block *sb, umode_t mode);
481 void hfsplus_delete_inode(struct inode *inode);
482 void hfsplus_inode_read_fork(struct inode *inode,
483                              struct hfsplus_fork_raw *fork);
484 void hfsplus_inode_write_fork(struct inode *inode,
485                               struct hfsplus_fork_raw *fork);
486 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd);
487 int hfsplus_cat_write_inode(struct inode *inode);
488 int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end,
489                        int datasync);
490 
491 /* ioctl.c */
492 long hfsplus_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
493 
494 /* options.c */
495 void hfsplus_fill_defaults(struct hfsplus_sb_info *opts);
496 int hfsplus_parse_options_remount(char *input, int *force);
497 int hfsplus_parse_options(char *input, struct hfsplus_sb_info *sbi);
498 int hfsplus_show_options(struct seq_file *seq, struct dentry *root);
499 
500 /* part_tbl.c */
501 int hfs_part_find(struct super_block *sb, sector_t *part_start,
502                   sector_t *part_size);
503 
504 /* super.c */
505 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino);
506 void hfsplus_mark_mdb_dirty(struct super_block *sb);
507 
508 /* tables.c */
509 extern u16 hfsplus_case_fold_table[];
510 extern u16 hfsplus_decompose_table[];
511 extern u16 hfsplus_compose_table[];
512 
513 /* unicode.c */
514 int hfsplus_strcasecmp(const struct hfsplus_unistr *s1,
515                        const struct hfsplus_unistr *s2);
516 int hfsplus_strcmp(const struct hfsplus_unistr *s1,
517                    const struct hfsplus_unistr *s2);
518 int hfsplus_uni2asc(struct super_block *sb, const struct hfsplus_unistr *ustr,
519                     char *astr, int *len_p);
520 int hfsplus_asc2uni(struct super_block *sb, struct hfsplus_unistr *ustr,
521                     int max_unistr_len, const char *astr, int len);
522 int hfsplus_hash_dentry(const struct dentry *dentry, struct qstr *str);
523 int hfsplus_compare_dentry(const struct dentry *dentry, unsigned int len,
524                            const char *str, const struct qstr *name);
525 
526 /* wrapper.c */
527 int hfsplus_submit_bio(struct super_block *sb, sector_t sector, void *buf,
528                        void **data, int op, int op_flags);
529 int hfsplus_read_wrapper(struct super_block *sb);
530 
531 /* time macros */
532 #define __hfsp_mt2ut(t)         (be32_to_cpu(t) - 2082844800U)
533 #define __hfsp_ut2mt(t)         (cpu_to_be32(t + 2082844800U))
534 
535 /* compatibility */
536 #define hfsp_mt2ut(t)           (struct timespec){ .tv_sec = __hfsp_mt2ut(t) }
537 #define hfsp_ut2mt(t)           __hfsp_ut2mt((t).tv_sec)
538 #define hfsp_now2mt()           __hfsp_ut2mt(get_seconds())
539 
540 #endif
541 

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