1 /*
2 * linux/fs/hfs/hfs_fs.h
3 *
4 * Copyright (C) 1995-1997 Paul H. Hargrove
5 * (C) 2003 Ardis Technologies <roman@ardistech.com>
6 * This file may be distributed under the terms of the GNU General Public License.
7 */
8
9 #ifndef _LINUX_HFS_FS_H
10 #define _LINUX_HFS_FS_H
11
12 #include <linux/slab.h>
13 #include <linux/types.h>
14 #include <linux/buffer_head.h>
15 #include <linux/fs.h>
16
17 #include <asm/byteorder.h>
18 #include <asm/uaccess.h>
19
20 #include "hfs.h"
21
22 #define DBG_BNODE_REFS 0x00000001
23 #define DBG_BNODE_MOD 0x00000002
24 #define DBG_CAT_MOD 0x00000004
25 #define DBG_INODE 0x00000008
26 #define DBG_SUPER 0x00000010
27 #define DBG_EXTENT 0x00000020
28 #define DBG_BITMAP 0x00000040
29
30 //#define DBG_MASK (DBG_EXTENT|DBG_INODE|DBG_BNODE_MOD|DBG_CAT_MOD|DBG_BITMAP)
31 //#define DBG_MASK (DBG_BNODE_MOD|DBG_CAT_MOD|DBG_INODE)
32 //#define DBG_MASK (DBG_CAT_MOD|DBG_BNODE_REFS|DBG_INODE|DBG_EXTENT)
33 #define DBG_MASK (0)
34
35 #define dprint(flg, fmt, args...) \
36 if (flg & DBG_MASK) printk(fmt , ## args)
37
38 /*
39 * struct hfs_inode_info
40 *
41 * The HFS-specific part of a Linux (struct inode)
42 */
43 struct hfs_inode_info {
44 atomic_t opencnt;
45
46 unsigned int flags;
47
48 /* to deal with localtime ugliness */
49 int tz_secondswest;
50
51 struct hfs_cat_key cat_key;
52
53 struct list_head open_dir_list;
54 struct inode *rsrc_inode;
55
56 struct semaphore extents_lock;
57
58 u16 alloc_blocks, clump_blocks;
59 sector_t fs_blocks;
60 /* Allocation extents from catlog record or volume header */
61 hfs_extent_rec first_extents;
62 u16 first_blocks;
63 hfs_extent_rec cached_extents;
64 u16 cached_start, cached_blocks;
65
66 loff_t phys_size;
67 struct inode vfs_inode;
68 };
69
70 #define HFS_FLG_RSRC 0x0001
71 #define HFS_FLG_EXT_DIRTY 0x0002
72 #define HFS_FLG_EXT_NEW 0x0004
73
74 #define HFS_IS_RSRC(inode) (HFS_I(inode)->flags & HFS_FLG_RSRC)
75
76 /*
77 * struct hfs_sb_info
78 *
79 * The HFS-specific part of a Linux (struct super_block)
80 */
81 struct hfs_sb_info {
82 struct buffer_head *mdb_bh; /* The hfs_buffer
83 holding the real
84 superblock (aka VIB
85 or MDB) */
86 struct hfs_mdb *mdb;
87 struct buffer_head *alt_mdb_bh; /* The hfs_buffer holding
88 the alternate superblock */
89 struct hfs_mdb *alt_mdb;
90 __be32 *bitmap; /* The page holding the
91 allocation bitmap */
92 struct hfs_btree *ext_tree; /* Information about
93 the extents b-tree */
94 struct hfs_btree *cat_tree; /* Information about
95 the catalog b-tree */
96 u32 file_count; /* The number of
97 regular files in
98 the filesystem */
99 u32 folder_count; /* The number of
100 directories in the
101 filesystem */
102 u32 next_id; /* The next available
103 file id number */
104 u32 clumpablks; /* The number of allocation
105 blocks to try to add when
106 extending a file */
107 u32 fs_start; /* The first 512-byte
108 block represented
109 in the bitmap */
110 u32 part_start;
111 u16 root_files; /* The number of
112 regular
113 (non-directory)
114 files in the root
115 directory */
116 u16 root_dirs; /* The number of
117 directories in the
118 root directory */
119 u16 fs_ablocks; /* The number of
120 allocation blocks
121 in the filesystem */
122 u16 free_ablocks; /* the number of unused
123 allocation blocks
124 in the filesystem */
125 u32 alloc_blksz; /* The size of an
126 "allocation block" */
127 int s_quiet; /* Silent failure when
128 changing owner or mode? */
129 __be32 s_type; /* Type for new files */
130 __be32 s_creator; /* Creator for new files */
131 umode_t s_file_umask; /* The umask applied to the
132 permissions on all files */
133 umode_t s_dir_umask; /* The umask applied to the
134 permissions on all dirs */
135 uid_t s_uid; /* The uid of all files */
136 gid_t s_gid; /* The gid of all files */
137
138 int session, part;
139
140 struct nls_table *nls_io, *nls_disk;
141
142 struct semaphore bitmap_lock;
143
144 unsigned long flags;
145
146 u16 blockoffset;
147
148 int fs_div;
149
150 struct hlist_head rsrc_inodes;
151 };
152
153 #define HFS_FLG_BITMAP_DIRTY 0
154 #define HFS_FLG_MDB_DIRTY 1
155 #define HFS_FLG_ALT_MDB_DIRTY 2
156
157 /* bitmap.c */
158 extern u32 hfs_vbm_search_free(struct super_block *, u32, u32 *);
159 extern int hfs_clear_vbm_bits(struct super_block *, u16, u16);
160
161 /* catalog.c */
162 extern int hfs_cat_keycmp(const btree_key *, const btree_key *);
163 struct hfs_find_data;
164 extern int hfs_cat_find_brec(struct super_block *, u32, struct hfs_find_data *);
165 extern int hfs_cat_create(u32, struct inode *, struct qstr *, struct inode *);
166 extern int hfs_cat_delete(u32, struct inode *, struct qstr *);
167 extern int hfs_cat_move(u32, struct inode *, struct qstr *,
168 struct inode *, struct qstr *);
169 extern void hfs_cat_build_key(struct super_block *, btree_key *, u32, struct qstr *);
170
171 /* dir.c */
172 extern const struct file_operations hfs_dir_operations;
173 extern const struct inode_operations hfs_dir_inode_operations;
174
175 /* extent.c */
176 extern int hfs_ext_keycmp(const btree_key *, const btree_key *);
177 extern int hfs_free_fork(struct super_block *, struct hfs_cat_file *, int);
178 extern void hfs_ext_write_extent(struct inode *);
179 extern int hfs_extend_file(struct inode *);
180 extern void hfs_file_truncate(struct inode *);
181
182 extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
183
184 /* inode.c */
185 extern const struct address_space_operations hfs_aops;
186 extern const struct address_space_operations hfs_btree_aops;
187
188 extern struct inode *hfs_new_inode(struct inode *, struct qstr *, int);
189 extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *);
190 extern int hfs_write_inode(struct inode *, int);
191 extern int hfs_inode_setattr(struct dentry *, struct iattr *);
192 extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext,
193 __be32 log_size, __be32 phys_size, u32 clump_size);
194 extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *);
195 extern void hfs_clear_inode(struct inode *);
196 extern void hfs_delete_inode(struct inode *);
197
198 /* attr.c */
199 extern int hfs_setxattr(struct dentry *dentry, const char *name,
200 const void *value, size_t size, int flags);
201 extern ssize_t hfs_getxattr(struct dentry *dentry, const char *name,
202 void *value, size_t size);
203 extern ssize_t hfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
204
205 /* mdb.c */
206 extern int hfs_mdb_get(struct super_block *);
207 extern void hfs_mdb_commit(struct super_block *);
208 extern void hfs_mdb_close(struct super_block *);
209 extern void hfs_mdb_put(struct super_block *);
210
211 /* part_tbl.c */
212 extern int hfs_part_find(struct super_block *, sector_t *, sector_t *);
213
214 /* string.c */
215 extern struct dentry_operations hfs_dentry_operations;
216
217 extern int hfs_hash_dentry(struct dentry *, struct qstr *);
218 extern int hfs_strcmp(const unsigned char *, unsigned int,
219 const unsigned char *, unsigned int);
220 extern int hfs_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
221
222 /* trans.c */
223 extern void hfs_asc2mac(struct super_block *, struct hfs_name *, struct qstr *);
224 extern int hfs_mac2asc(struct super_block *, char *, const struct hfs_name *);
225
226 extern struct timezone sys_tz;
227
228 /*
229 * There are two time systems. Both are based on seconds since
230 * a particular time/date.
231 * Unix: unsigned lil-endian since 00:00 GMT, Jan. 1, 1970
232 * mac: unsigned big-endian since 00:00 GMT, Jan. 1, 1904
233 *
234 */
235 #define __hfs_u_to_mtime(sec) cpu_to_be32(sec + 2082844800U - sys_tz.tz_minuteswest * 60)
236 #define __hfs_m_to_utime(sec) (be32_to_cpu(sec) - 2082844800U + sys_tz.tz_minuteswest * 60)
237
238 #define HFS_I(inode) (list_entry(inode, struct hfs_inode_info, vfs_inode))
239 #define HFS_SB(sb) ((struct hfs_sb_info *)(sb)->s_fs_info)
240
241 #define hfs_m_to_utime(time) (struct timespec){ .tv_sec = __hfs_m_to_utime(time) }
242 #define hfs_u_to_mtime(time) __hfs_u_to_mtime((time).tv_sec)
243 #define hfs_mtime() __hfs_u_to_mtime(get_seconds())
244
245 static inline const char *hfs_mdb_name(struct super_block *sb)
246 {
247 return sb->s_id;
248 }
249
250 static inline void hfs_bitmap_dirty(struct super_block *sb)
251 {
252 set_bit(HFS_FLG_BITMAP_DIRTY, &HFS_SB(sb)->flags);
253 sb->s_dirt = 1;
254 }
255
256 static inline void hfs_buffer_sync(struct buffer_head *bh)
257 {
258 while (buffer_locked(bh)) {
259 wait_on_buffer(bh);
260 }
261 if (buffer_dirty(bh)) {
262 ll_rw_block(WRITE, 1, &bh);
263 wait_on_buffer(bh);
264 }
265 }
266
267 #define sb_bread512(sb, sec, data) ({ \
268 struct buffer_head *__bh; \
269 sector_t __block; \
270 loff_t __start; \
271 int __offset; \
272 \
273 __start = (loff_t)(sec) << HFS_SECTOR_SIZE_BITS;\
274 __block = __start >> (sb)->s_blocksize_bits; \
275 __offset = __start & ((sb)->s_blocksize - 1); \
276 __bh = sb_bread((sb), __block); \
277 if (likely(__bh != NULL)) \
278 data = (void *)(__bh->b_data + __offset);\
279 else \
280 data = NULL; \
281 __bh; \
282 })
283
284 #endif
285
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