Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/hpfs/hpfs_fn.h | |
3 | * | |
4 | * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 | |
5 | * | |
6 | * function headers | |
7 | */ | |
8 | ||
9 | //#define DBG | |
10 | //#define DEBUG_LOCKS | |
11 | ||
7bf6d78d | 12 | #include <linux/mutex.h> |
1da177e4 LT |
13 | #include <linux/pagemap.h> |
14 | #include <linux/buffer_head.h> | |
1da177e4 | 15 | #include <linux/slab.h> |
d0969d19 | 16 | #include <asm/unaligned.h> |
1da177e4 LT |
17 | |
18 | #include "hpfs.h" | |
19 | ||
20 | #define EIOERROR EIO | |
21 | #define EFSERROR EPERM | |
22 | #define EMEMERROR ENOMEM | |
23 | ||
24 | #define ANODE_ALLOC_FWD 512 | |
25 | #define FNODE_ALLOC_FWD 0 | |
26 | #define ALLOC_FWD_MIN 16 | |
27 | #define ALLOC_FWD_MAX 128 | |
28 | #define ALLOC_M 1 | |
29 | #define FNODE_RD_AHEAD 16 | |
30 | #define ANODE_RD_AHEAD 16 | |
31 | #define DNODE_RD_AHEAD 4 | |
32 | ||
33 | #define FREE_DNODES_ADD 58 | |
34 | #define FREE_DNODES_DEL 29 | |
35 | ||
36 | #define CHKCOND(x,y) if (!(x)) printk y | |
37 | ||
38 | #ifdef DBG | |
39 | #define PRINTK(x) printk x | |
40 | #else | |
41 | #undef PRINTK | |
42 | #define PRINTK(x) | |
43 | #endif | |
44 | ||
45 | struct hpfs_inode_info { | |
46 | loff_t mmu_private; | |
47 | ino_t i_parent_dir; /* (directories) gives fnode of parent dir */ | |
48 | unsigned i_dno; /* (directories) root dnode */ | |
49 | unsigned i_dpos; /* (directories) temp for readdir */ | |
50 | unsigned i_dsubdno; /* (directories) temp for readdir */ | |
51 | unsigned i_file_sec; /* (files) minimalist cache of alloc info */ | |
52 | unsigned i_disk_sec; /* (files) minimalist cache of alloc info */ | |
53 | unsigned i_n_secs; /* (files) minimalist cache of alloc info */ | |
54 | unsigned i_ea_size; /* size of extended attributes */ | |
1da177e4 LT |
55 | unsigned i_ea_mode : 1; /* file's permission is stored in ea */ |
56 | unsigned i_ea_uid : 1; /* file's uid is stored in ea */ | |
57 | unsigned i_ea_gid : 1; /* file's gid is stored in ea */ | |
58 | unsigned i_dirty : 1; | |
1da177e4 LT |
59 | loff_t **i_rddir_off; |
60 | struct inode vfs_inode; | |
61 | }; | |
62 | ||
63 | struct hpfs_sb_info { | |
7dd29d8d | 64 | struct mutex hpfs_mutex; /* global hpfs lock */ |
1da177e4 LT |
65 | ino_t sb_root; /* inode number of root dir */ |
66 | unsigned sb_fs_size; /* file system size, sectors */ | |
67 | unsigned sb_bitmaps; /* sector number of bitmap list */ | |
68 | unsigned sb_dirband_start; /* directory band start sector */ | |
69 | unsigned sb_dirband_size; /* directory band size, dnodes */ | |
70 | unsigned sb_dmap; /* sector number of dnode bit map */ | |
71 | unsigned sb_n_free; /* free blocks for statfs, or -1 */ | |
72 | unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */ | |
73 | uid_t sb_uid; /* uid from mount options */ | |
74 | gid_t sb_gid; /* gid from mount options */ | |
75 | umode_t sb_mode; /* mode from mount options */ | |
1da177e4 LT |
76 | unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */ |
77 | unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */ | |
78 | unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */ | |
79 | unsigned sb_lowercase : 1; /* downcase filenames hackery */ | |
80 | unsigned sb_was_error : 1; /* there was an error, set dirty flag */ | |
81 | unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */ | |
82 | unsigned char *sb_cp_table; /* code page tables: */ | |
83 | /* 128 bytes uppercasing table & */ | |
84 | /* 128 bytes lowercasing table */ | |
85 | unsigned *sb_bmp_dir; /* main bitmap directory */ | |
86 | unsigned sb_c_bitmap; /* current bitmap */ | |
87 | unsigned sb_max_fwd_alloc; /* max forwad allocation */ | |
1da177e4 LT |
88 | int sb_timeshift; |
89 | }; | |
90 | ||
1da177e4 LT |
91 | /* Four 512-byte buffers and the 2k block obtained by concatenating them */ |
92 | ||
93 | struct quad_buffer_head { | |
94 | struct buffer_head *bh[4]; | |
95 | void *data; | |
96 | }; | |
97 | ||
98 | /* The b-tree down pointer from a dir entry */ | |
99 | ||
100 | static inline dnode_secno de_down_pointer (struct hpfs_dirent *de) | |
101 | { | |
102 | CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n")); | |
0b69760b | 103 | return le32_to_cpu(*(dnode_secno *) ((void *) de + le16_to_cpu(de->length) - 4)); |
1da177e4 LT |
104 | } |
105 | ||
106 | /* The first dir entry in a dnode */ | |
107 | ||
108 | static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode) | |
109 | { | |
110 | return (void *) dnode->dirent; | |
111 | } | |
112 | ||
113 | /* The end+1 of the dir entries */ | |
114 | ||
115 | static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode) | |
116 | { | |
0b69760b MP |
117 | CHKCOND(le32_to_cpu(dnode->first_free)>=0x14 && le32_to_cpu(dnode->first_free)<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %x\n",(unsigned)le32_to_cpu(dnode->first_free))); |
118 | return (void *) dnode + le32_to_cpu(dnode->first_free); | |
1da177e4 LT |
119 | } |
120 | ||
121 | /* The dir entry after dir entry de */ | |
122 | ||
123 | static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de) | |
124 | { | |
0b69760b MP |
125 | CHKCOND(le16_to_cpu(de->length)>=0x20 && le16_to_cpu(de->length)<0x800,("HPFS: de_next_de: de->length = %x\n",(unsigned)le16_to_cpu(de->length))); |
126 | return (void *) de + le16_to_cpu(de->length); | |
1da177e4 LT |
127 | } |
128 | ||
129 | static inline struct extended_attribute *fnode_ea(struct fnode *fnode) | |
130 | { | |
0b69760b | 131 | return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s)); |
1da177e4 LT |
132 | } |
133 | ||
134 | static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode) | |
135 | { | |
0b69760b | 136 | return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s)); |
1da177e4 LT |
137 | } |
138 | ||
d0969d19 MP |
139 | static unsigned ea_valuelen(struct extended_attribute *ea) |
140 | { | |
141 | return ea->valuelen_lo + 256 * ea->valuelen_hi; | |
142 | } | |
143 | ||
1da177e4 LT |
144 | static inline struct extended_attribute *next_ea(struct extended_attribute *ea) |
145 | { | |
d0969d19 | 146 | return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea)); |
1da177e4 LT |
147 | } |
148 | ||
149 | static inline secno ea_sec(struct extended_attribute *ea) | |
150 | { | |
d0969d19 | 151 | return le32_to_cpu(get_unaligned((secno *)((char *)ea + 9 + ea->namelen))); |
1da177e4 LT |
152 | } |
153 | ||
154 | static inline secno ea_len(struct extended_attribute *ea) | |
155 | { | |
d0969d19 | 156 | return le32_to_cpu(get_unaligned((secno *)((char *)ea + 5 + ea->namelen))); |
1da177e4 LT |
157 | } |
158 | ||
159 | static inline char *ea_data(struct extended_attribute *ea) | |
160 | { | |
161 | return (char *)((char *)ea + 5 + ea->namelen); | |
162 | } | |
163 | ||
164 | static inline unsigned de_size(int namelen, secno down_ptr) | |
165 | { | |
166 | return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0); | |
167 | } | |
168 | ||
169 | static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src) | |
170 | { | |
171 | int a; | |
172 | int n; | |
173 | if (!dst || !src) return; | |
174 | a = dst->down; | |
175 | n = dst->not_8x3; | |
176 | memcpy((char *)dst + 2, (char *)src + 2, 28); | |
177 | dst->down = a; | |
178 | dst->not_8x3 = n; | |
179 | } | |
180 | ||
0b69760b | 181 | static inline unsigned tstbits(u32 *bmp, unsigned b, unsigned n) |
1da177e4 LT |
182 | { |
183 | int i; | |
184 | if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n; | |
0b69760b | 185 | if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1; |
1da177e4 | 186 | for (i = 1; i < n; i++) |
0b69760b | 187 | if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1)) |
1da177e4 LT |
188 | return i + 1; |
189 | return 0; | |
190 | } | |
191 | ||
192 | /* alloc.c */ | |
193 | ||
194 | int hpfs_chk_sectors(struct super_block *, secno, int, char *); | |
7d23ce36 | 195 | secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int); |
1da177e4 LT |
196 | int hpfs_alloc_if_possible(struct super_block *, secno); |
197 | void hpfs_free_sectors(struct super_block *, secno, unsigned); | |
198 | int hpfs_check_free_dnodes(struct super_block *, int); | |
199 | void hpfs_free_dnode(struct super_block *, secno); | |
7d23ce36 | 200 | struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *); |
1da177e4 LT |
201 | struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **); |
202 | struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **); | |
203 | ||
204 | /* anode.c */ | |
205 | ||
206 | secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *); | |
207 | secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned); | |
208 | void hpfs_remove_btree(struct super_block *, struct bplus_header *); | |
209 | int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *); | |
7e7742ee | 210 | int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *); |
1da177e4 LT |
211 | void hpfs_ea_remove(struct super_block *, secno, int, unsigned); |
212 | void hpfs_truncate_btree(struct super_block *, secno, int, unsigned); | |
213 | void hpfs_remove_fnode(struct super_block *, fnode_secno fno); | |
214 | ||
215 | /* buffer.c */ | |
216 | ||
1da177e4 LT |
217 | void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int); |
218 | void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **); | |
219 | void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int); | |
220 | void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *); | |
221 | void hpfs_brelse4(struct quad_buffer_head *); | |
222 | void hpfs_mark_4buffers_dirty(struct quad_buffer_head *); | |
223 | ||
224 | /* dentry.c */ | |
225 | ||
43d344d7 | 226 | extern const struct dentry_operations hpfs_dentry_operations; |
1da177e4 LT |
227 | |
228 | /* dir.c */ | |
229 | ||
230 | struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *); | |
4b6f5d20 | 231 | extern const struct file_operations hpfs_dir_ops; |
1da177e4 LT |
232 | |
233 | /* dnode.c */ | |
234 | ||
235 | void hpfs_add_pos(struct inode *, loff_t *); | |
236 | void hpfs_del_pos(struct inode *, loff_t *); | |
7e7742ee AV |
237 | struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, |
238 | const unsigned char *, unsigned, secno); | |
239 | int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned, | |
7d23ce36 | 240 | struct hpfs_dirent *); |
1da177e4 LT |
241 | int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int); |
242 | void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *); | |
243 | dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno); | |
244 | struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *); | |
7e7742ee AV |
245 | struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, |
246 | const unsigned char *, unsigned, dnode_secno *, | |
247 | struct quad_buffer_head *); | |
1da177e4 LT |
248 | void hpfs_remove_dtree(struct super_block *, dnode_secno); |
249 | struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *); | |
250 | ||
251 | /* ea.c */ | |
252 | ||
253 | void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned); | |
254 | int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int); | |
255 | char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *); | |
7e7742ee AV |
256 | void hpfs_set_ea(struct inode *, struct fnode *, const char *, |
257 | const char *, int); | |
1da177e4 LT |
258 | |
259 | /* file.c */ | |
260 | ||
7ea80859 | 261 | int hpfs_file_fsync(struct file *, int); |
4b6f5d20 | 262 | extern const struct file_operations hpfs_file_ops; |
92e1d5be | 263 | extern const struct inode_operations hpfs_file_iops; |
f5e54d6e | 264 | extern const struct address_space_operations hpfs_aops; |
1da177e4 LT |
265 | |
266 | /* inode.c */ | |
267 | ||
268 | void hpfs_init_inode(struct inode *); | |
269 | void hpfs_read_inode(struct inode *); | |
270 | void hpfs_write_inode(struct inode *); | |
271 | void hpfs_write_inode_nolock(struct inode *); | |
ca30bc99 | 272 | int hpfs_setattr(struct dentry *, struct iattr *); |
1da177e4 | 273 | void hpfs_write_if_changed(struct inode *); |
ea544009 | 274 | void hpfs_evict_inode(struct inode *); |
1da177e4 LT |
275 | |
276 | /* map.c */ | |
277 | ||
278 | unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); | |
279 | unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); | |
7e7742ee | 280 | unsigned char *hpfs_load_code_page(struct super_block *, secno); |
1da177e4 LT |
281 | secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp); |
282 | struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); | |
283 | struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); | |
284 | struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); | |
285 | dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino); | |
286 | ||
287 | /* name.c */ | |
288 | ||
289 | unsigned char hpfs_upcase(unsigned char *, unsigned char); | |
7e7742ee AV |
290 | int hpfs_chk_name(const unsigned char *, unsigned *); |
291 | unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); | |
292 | int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned, | |
293 | const unsigned char *, unsigned, int); | |
294 | int hpfs_is_name_long(const unsigned char *, unsigned); | |
295 | void hpfs_adjust_length(const unsigned char *, unsigned *); | |
1da177e4 LT |
296 | |
297 | /* namei.c */ | |
298 | ||
92e1d5be | 299 | extern const struct inode_operations hpfs_dir_iops; |
f5e54d6e | 300 | extern const struct address_space_operations hpfs_symlink_aops; |
1da177e4 LT |
301 | |
302 | static inline struct hpfs_inode_info *hpfs_i(struct inode *inode) | |
303 | { | |
304 | return list_entry(inode, struct hpfs_inode_info, vfs_inode); | |
305 | } | |
306 | ||
307 | static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb) | |
308 | { | |
309 | return sb->s_fs_info; | |
310 | } | |
311 | ||
312 | /* super.c */ | |
313 | ||
352d94d0 AD |
314 | void hpfs_error(struct super_block *, const char *, ...) |
315 | __attribute__((format (printf, 2, 3))); | |
1da177e4 LT |
316 | int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); |
317 | unsigned hpfs_count_one_bitmap(struct super_block *, secno); | |
318 | ||
319 | /* | |
320 | * local time (HPFS) to GMT (Unix) | |
321 | */ | |
322 | ||
323 | static inline time_t local_to_gmt(struct super_block *s, time32_t t) | |
324 | { | |
325 | extern struct timezone sys_tz; | |
326 | return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift; | |
327 | } | |
328 | ||
329 | static inline time32_t gmt_to_local(struct super_block *s, time_t t) | |
330 | { | |
331 | extern struct timezone sys_tz; | |
332 | return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift; | |
333 | } | |
9a311b96 AB |
334 | |
335 | /* | |
336 | * Locking: | |
337 | * | |
7dd29d8d MP |
338 | * hpfs_lock() locks the whole filesystem. It must be taken |
339 | * on any method called by the VFS. | |
9a311b96 | 340 | * |
7dd29d8d MP |
341 | * We don't do any per-file locking anymore, it is hard to |
342 | * review and HPFS is not performance-sensitive anyway. | |
9a311b96 AB |
343 | */ |
344 | static inline void hpfs_lock(struct super_block *s) | |
345 | { | |
7dd29d8d MP |
346 | struct hpfs_sb_info *sbi = hpfs_sb(s); |
347 | mutex_lock(&sbi->hpfs_mutex); | |
9a311b96 AB |
348 | } |
349 | ||
350 | static inline void hpfs_unlock(struct super_block *s) | |
351 | { | |
7dd29d8d MP |
352 | struct hpfs_sb_info *sbi = hpfs_sb(s); |
353 | mutex_unlock(&sbi->hpfs_mutex); | |
354 | } | |
355 | ||
356 | static inline void hpfs_lock_assert(struct super_block *s) | |
357 | { | |
358 | struct hpfs_sb_info *sbi = hpfs_sb(s); | |
359 | WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex)); | |
9a311b96 | 360 | } |