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 | #ifdef pr_fmt |
13 | #undef pr_fmt |
14 | #endif |
15 | |
16 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
17 | |
18 | #include <linux/slab.h> |
19 | #include <linux/types.h> |
20 | #include <linux/mutex.h> |
21 | #include <linux/buffer_head.h> |
22 | #include <linux/fs.h> |
23 | #include <linux/workqueue.h> |
24 | |
25 | #include <asm/byteorder.h> |
26 | #include <linux/uaccess.h> |
27 | |
28 | #include "hfs.h" |
29 | |
30 | #define DBG_BNODE_REFS 0x00000001 |
31 | #define DBG_BNODE_MOD 0x00000002 |
32 | #define DBG_CAT_MOD 0x00000004 |
33 | #define DBG_INODE 0x00000008 |
34 | #define DBG_SUPER 0x00000010 |
35 | #define DBG_EXTENT 0x00000020 |
36 | #define DBG_BITMAP 0x00000040 |
37 | |
38 | //#define DBG_MASK (DBG_EXTENT|DBG_INODE|DBG_BNODE_MOD|DBG_CAT_MOD|DBG_BITMAP) |
39 | //#define DBG_MASK (DBG_BNODE_MOD|DBG_CAT_MOD|DBG_INODE) |
40 | //#define DBG_MASK (DBG_CAT_MOD|DBG_BNODE_REFS|DBG_INODE|DBG_EXTENT) |
41 | #define DBG_MASK (0) |
42 | |
43 | #define hfs_dbg(flg, fmt, ...) \ |
44 | do { \ |
45 | if (DBG_##flg & DBG_MASK) \ |
46 | printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \ |
47 | } while (0) |
48 | |
49 | #define hfs_dbg_cont(flg, fmt, ...) \ |
50 | do { \ |
51 | if (DBG_##flg & DBG_MASK) \ |
52 | pr_cont(fmt, ##__VA_ARGS__); \ |
53 | } while (0) |
54 | |
55 | |
56 | /* |
57 | * struct hfs_inode_info |
58 | * |
59 | * The HFS-specific part of a Linux (struct inode) |
60 | */ |
61 | struct hfs_inode_info { |
62 | atomic_t opencnt; |
63 | |
64 | unsigned int flags; |
65 | |
66 | /* to deal with localtime ugliness */ |
67 | int tz_secondswest; |
68 | |
69 | struct hfs_cat_key cat_key; |
70 | |
71 | struct list_head open_dir_list; |
72 | spinlock_t open_dir_lock; |
73 | struct inode *rsrc_inode; |
74 | |
75 | struct mutex extents_lock; |
76 | |
77 | u16 alloc_blocks, clump_blocks; |
78 | sector_t fs_blocks; |
79 | /* Allocation extents from catlog record or volume header */ |
80 | hfs_extent_rec first_extents; |
81 | u16 first_blocks; |
82 | hfs_extent_rec cached_extents; |
83 | u16 cached_start, cached_blocks; |
84 | |
85 | loff_t phys_size; |
86 | struct inode vfs_inode; |
87 | }; |
88 | |
89 | #define HFS_FLG_RSRC 0x0001 |
90 | #define HFS_FLG_EXT_DIRTY 0x0002 |
91 | #define HFS_FLG_EXT_NEW 0x0004 |
92 | |
93 | #define HFS_IS_RSRC(inode) (HFS_I(inode)->flags & HFS_FLG_RSRC) |
94 | |
95 | /* |
96 | * struct hfs_sb_info |
97 | * |
98 | * The HFS-specific part of a Linux (struct super_block) |
99 | */ |
100 | struct hfs_sb_info { |
101 | struct buffer_head *mdb_bh; /* The hfs_buffer |
102 | holding the real |
103 | superblock (aka VIB |
104 | or MDB) */ |
105 | struct hfs_mdb *mdb; |
106 | struct buffer_head *alt_mdb_bh; /* The hfs_buffer holding |
107 | the alternate superblock */ |
108 | struct hfs_mdb *alt_mdb; |
109 | __be32 *bitmap; /* The page holding the |
110 | allocation bitmap */ |
111 | struct hfs_btree *ext_tree; /* Information about |
112 | the extents b-tree */ |
113 | struct hfs_btree *cat_tree; /* Information about |
114 | the catalog b-tree */ |
115 | u32 file_count; /* The number of |
116 | regular files in |
117 | the filesystem */ |
118 | u32 folder_count; /* The number of |
119 | directories in the |
120 | filesystem */ |
121 | u32 next_id; /* The next available |
122 | file id number */ |
123 | u32 clumpablks; /* The number of allocation |
124 | blocks to try to add when |
125 | extending a file */ |
126 | u32 fs_start; /* The first 512-byte |
127 | block represented |
128 | in the bitmap */ |
129 | u32 part_start; |
130 | u16 root_files; /* The number of |
131 | regular |
132 | (non-directory) |
133 | files in the root |
134 | directory */ |
135 | u16 root_dirs; /* The number of |
136 | directories in the |
137 | root directory */ |
138 | u16 fs_ablocks; /* The number of |
139 | allocation blocks |
140 | in the filesystem */ |
141 | u16 free_ablocks; /* the number of unused |
142 | allocation blocks |
143 | in the filesystem */ |
144 | u32 alloc_blksz; /* The size of an |
145 | "allocation block" */ |
146 | int s_quiet; /* Silent failure when |
147 | changing owner or mode? */ |
148 | __be32 s_type; /* Type for new files */ |
149 | __be32 s_creator; /* Creator for new files */ |
150 | umode_t s_file_umask; /* The umask applied to the |
151 | permissions on all files */ |
152 | umode_t s_dir_umask; /* The umask applied to the |
153 | permissions on all dirs */ |
154 | kuid_t s_uid; /* The uid of all files */ |
155 | kgid_t s_gid; /* The gid of all files */ |
156 | |
157 | int session, part; |
158 | struct nls_table *nls_io, *nls_disk; |
159 | struct mutex bitmap_lock; |
160 | unsigned long flags; |
161 | u16 blockoffset; |
162 | int fs_div; |
163 | struct super_block *sb; |
164 | int work_queued; /* non-zero delayed work is queued */ |
165 | struct delayed_work mdb_work; /* MDB flush delayed work */ |
166 | spinlock_t work_lock; /* protects mdb_work and work_queued */ |
167 | }; |
168 | |
169 | #define HFS_FLG_BITMAP_DIRTY 0 |
170 | #define HFS_FLG_MDB_DIRTY 1 |
171 | #define HFS_FLG_ALT_MDB_DIRTY 2 |
172 | |
173 | /* bitmap.c */ |
174 | extern u32 hfs_vbm_search_free(struct super_block *, u32, u32 *); |
175 | extern int hfs_clear_vbm_bits(struct super_block *, u16, u16); |
176 | |
177 | /* catalog.c */ |
178 | extern int hfs_cat_keycmp(const btree_key *, const btree_key *); |
179 | struct hfs_find_data; |
180 | extern int hfs_cat_find_brec(struct super_block *, u32, struct hfs_find_data *); |
181 | extern int hfs_cat_create(u32, struct inode *, const struct qstr *, struct inode *); |
182 | extern int hfs_cat_delete(u32, struct inode *, const struct qstr *); |
183 | extern int hfs_cat_move(u32, struct inode *, const struct qstr *, |
184 | struct inode *, const struct qstr *); |
185 | extern void hfs_cat_build_key(struct super_block *, btree_key *, u32, const struct qstr *); |
186 | |
187 | /* dir.c */ |
188 | extern const struct file_operations hfs_dir_operations; |
189 | extern const struct inode_operations hfs_dir_inode_operations; |
190 | |
191 | /* extent.c */ |
192 | extern int hfs_ext_keycmp(const btree_key *, const btree_key *); |
193 | extern int hfs_free_fork(struct super_block *, struct hfs_cat_file *, int); |
194 | extern int hfs_ext_write_extent(struct inode *); |
195 | extern int hfs_extend_file(struct inode *); |
196 | extern void hfs_file_truncate(struct inode *); |
197 | |
198 | extern int hfs_get_block(struct inode *, sector_t, struct buffer_head *, int); |
199 | |
200 | /* inode.c */ |
201 | extern const struct address_space_operations hfs_aops; |
202 | extern const struct address_space_operations hfs_btree_aops; |
203 | |
204 | int hfs_write_begin(struct file *file, struct address_space *mapping, |
205 | loff_t pos, unsigned len, struct page **pagep, void **fsdata); |
206 | extern struct inode *hfs_new_inode(struct inode *, const struct qstr *, umode_t); |
207 | extern void hfs_inode_write_fork(struct inode *, struct hfs_extent *, __be32 *, __be32 *); |
208 | extern int hfs_write_inode(struct inode *, struct writeback_control *); |
209 | extern int hfs_inode_setattr(struct mnt_idmap *, struct dentry *, |
210 | struct iattr *); |
211 | extern void hfs_inode_read_fork(struct inode *inode, struct hfs_extent *ext, |
212 | __be32 log_size, __be32 phys_size, u32 clump_size); |
213 | extern struct inode *hfs_iget(struct super_block *, struct hfs_cat_key *, hfs_cat_rec *); |
214 | extern void hfs_evict_inode(struct inode *); |
215 | extern void hfs_delete_inode(struct inode *); |
216 | |
217 | /* attr.c */ |
218 | extern const struct xattr_handler * const hfs_xattr_handlers[]; |
219 | |
220 | /* mdb.c */ |
221 | extern int hfs_mdb_get(struct super_block *); |
222 | extern void hfs_mdb_commit(struct super_block *); |
223 | extern void hfs_mdb_close(struct super_block *); |
224 | extern void hfs_mdb_put(struct super_block *); |
225 | |
226 | /* part_tbl.c */ |
227 | extern int hfs_part_find(struct super_block *, sector_t *, sector_t *); |
228 | |
229 | /* string.c */ |
230 | extern const struct dentry_operations hfs_dentry_operations; |
231 | |
232 | extern int hfs_hash_dentry(const struct dentry *, struct qstr *); |
233 | extern int hfs_strcmp(const unsigned char *, unsigned int, |
234 | const unsigned char *, unsigned int); |
235 | extern int hfs_compare_dentry(const struct dentry *dentry, |
236 | unsigned int len, const char *str, const struct qstr *name); |
237 | |
238 | /* trans.c */ |
239 | extern void hfs_asc2mac(struct super_block *, struct hfs_name *, const struct qstr *); |
240 | extern int hfs_mac2asc(struct super_block *, char *, const struct hfs_name *); |
241 | |
242 | /* super.c */ |
243 | extern void hfs_mark_mdb_dirty(struct super_block *sb); |
244 | |
245 | /* |
246 | * There are two time systems. Both are based on seconds since |
247 | * a particular time/date. |
248 | * Unix: signed little-endian since 00:00 GMT, Jan. 1, 1970 |
249 | * mac: unsigned big-endian since 00:00 GMT, Jan. 1, 1904 |
250 | * |
251 | * HFS implementations are highly inconsistent, this one matches the |
252 | * traditional behavior of 64-bit Linux, giving the most useful |
253 | * time range between 1970 and 2106, by treating any on-disk timestamp |
254 | * under HFS_UTC_OFFSET (Jan 1 1970) as a time between 2040 and 2106. |
255 | */ |
256 | #define HFS_UTC_OFFSET 2082844800U |
257 | |
258 | static inline time64_t __hfs_m_to_utime(__be32 mt) |
259 | { |
260 | time64_t ut = (u32)(be32_to_cpu(mt) - HFS_UTC_OFFSET); |
261 | |
262 | return ut + sys_tz.tz_minuteswest * 60; |
263 | } |
264 | |
265 | static inline __be32 __hfs_u_to_mtime(time64_t ut) |
266 | { |
267 | ut -= sys_tz.tz_minuteswest * 60; |
268 | |
269 | return cpu_to_be32(lower_32_bits(ut) + HFS_UTC_OFFSET); |
270 | } |
271 | #define HFS_I(inode) (container_of(inode, struct hfs_inode_info, vfs_inode)) |
272 | #define HFS_SB(sb) ((struct hfs_sb_info *)(sb)->s_fs_info) |
273 | |
274 | #define hfs_m_to_utime(time) (struct timespec64){ .tv_sec = __hfs_m_to_utime(time) } |
275 | #define hfs_u_to_mtime(time) __hfs_u_to_mtime((time).tv_sec) |
276 | #define hfs_mtime() __hfs_u_to_mtime(ktime_get_real_seconds()) |
277 | |
278 | static inline const char *hfs_mdb_name(struct super_block *sb) |
279 | { |
280 | return sb->s_id; |
281 | } |
282 | |
283 | static inline void hfs_bitmap_dirty(struct super_block *sb) |
284 | { |
285 | set_bit(HFS_FLG_BITMAP_DIRTY, addr: &HFS_SB(sb)->flags); |
286 | hfs_mark_mdb_dirty(sb); |
287 | } |
288 | |
289 | #define sb_bread512(sb, sec, data) ({ \ |
290 | struct buffer_head *__bh; \ |
291 | sector_t __block; \ |
292 | loff_t __start; \ |
293 | int __offset; \ |
294 | \ |
295 | __start = (loff_t)(sec) << HFS_SECTOR_SIZE_BITS;\ |
296 | __block = __start >> (sb)->s_blocksize_bits; \ |
297 | __offset = __start & ((sb)->s_blocksize - 1); \ |
298 | __bh = sb_bread((sb), __block); \ |
299 | if (likely(__bh != NULL)) \ |
300 | data = (void *)(__bh->b_data + __offset);\ |
301 | else \ |
302 | data = NULL; \ |
303 | __bh; \ |
304 | }) |
305 | |
306 | #endif |
307 | |