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