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 | |
14da17f9 FF |
11 | #ifdef pr_fmt |
12 | #undef pr_fmt | |
13 | #endif | |
14 | ||
15 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
1da177e4 | 16 | |
7bf6d78d | 17 | #include <linux/mutex.h> |
1da177e4 LT |
18 | #include <linux/pagemap.h> |
19 | #include <linux/buffer_head.h> | |
1da177e4 | 20 | #include <linux/slab.h> |
d0969d19 | 21 | #include <asm/unaligned.h> |
1da177e4 LT |
22 | |
23 | #include "hpfs.h" | |
24 | ||
25 | #define EIOERROR EIO | |
26 | #define EFSERROR EPERM | |
27 | #define EMEMERROR ENOMEM | |
28 | ||
29 | #define ANODE_ALLOC_FWD 512 | |
30 | #define FNODE_ALLOC_FWD 0 | |
31 | #define ALLOC_FWD_MIN 16 | |
32 | #define ALLOC_FWD_MAX 128 | |
33 | #define ALLOC_M 1 | |
34 | #define FNODE_RD_AHEAD 16 | |
275f495d MP |
35 | #define ANODE_RD_AHEAD 0 |
36 | #define DNODE_RD_AHEAD 72 | |
37 | #define COUNT_RD_AHEAD 62 | |
1da177e4 LT |
38 | |
39 | #define FREE_DNODES_ADD 58 | |
40 | #define FREE_DNODES_DEL 29 | |
41 | ||
42 | #define CHKCOND(x,y) if (!(x)) printk y | |
43 | ||
1da177e4 LT |
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 */ | |
0e1a43c7 EB |
72 | kuid_t sb_uid; /* uid from mount options */ |
73 | kgid_t sb_gid; /* gid from mount options */ | |
1da177e4 | 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 */ | |
28fe3c19 | 84 | __le32 *sb_bmp_dir; /* main bitmap directory */ |
1da177e4 LT |
85 | unsigned sb_c_bitmap; /* current bitmap */ |
86 | unsigned sb_max_fwd_alloc; /* max forwad allocation */ | |
1da177e4 | 87 | int sb_timeshift; |
30687e0a | 88 | struct rcu_head rcu; |
1da177e4 LT |
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")); | |
46287aa6 | 103 | return le32_to_cpu(*(__le32 *) ((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 | { | |
77ee26e4 | 151 | return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen))); |
1da177e4 LT |
152 | } |
153 | ||
154 | static inline secno ea_len(struct extended_attribute *ea) | |
155 | { | |
77ee26e4 | 156 | return le32_to_cpu(get_unaligned((__le32 *)((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 | ||
52576da3 | 181 | static inline unsigned tstbits(__le32 *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 | ||
275f495d | 217 | void hpfs_prefetch_sectors(struct super_block *, unsigned, int); |
1da177e4 LT |
218 | void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int); |
219 | void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **); | |
220 | void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int); | |
221 | void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *); | |
222 | void hpfs_brelse4(struct quad_buffer_head *); | |
223 | void hpfs_mark_4buffers_dirty(struct quad_buffer_head *); | |
224 | ||
225 | /* dentry.c */ | |
226 | ||
43d344d7 | 227 | extern const struct dentry_operations hpfs_dentry_operations; |
1da177e4 LT |
228 | |
229 | /* dir.c */ | |
230 | ||
00cd8dd3 | 231 | struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int); |
4b6f5d20 | 232 | extern const struct file_operations hpfs_dir_ops; |
1da177e4 LT |
233 | |
234 | /* dnode.c */ | |
235 | ||
236 | void hpfs_add_pos(struct inode *, loff_t *); | |
237 | void hpfs_del_pos(struct inode *, loff_t *); | |
7e7742ee AV |
238 | struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, |
239 | const unsigned char *, unsigned, secno); | |
240 | int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned, | |
7d23ce36 | 241 | struct hpfs_dirent *); |
1da177e4 LT |
242 | int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int); |
243 | void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *); | |
244 | dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno); | |
245 | struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *); | |
7e7742ee AV |
246 | struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, |
247 | const unsigned char *, unsigned, dnode_secno *, | |
248 | struct quad_buffer_head *); | |
1da177e4 LT |
249 | void hpfs_remove_dtree(struct super_block *, dnode_secno); |
250 | struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *); | |
251 | ||
252 | /* ea.c */ | |
253 | ||
254 | void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned); | |
255 | int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int); | |
256 | char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *); | |
7e7742ee AV |
257 | void hpfs_set_ea(struct inode *, struct fnode *, const char *, |
258 | const char *, int); | |
1da177e4 LT |
259 | |
260 | /* file.c */ | |
261 | ||
02c24a82 | 262 | int hpfs_file_fsync(struct file *, loff_t, loff_t, int); |
70b31c4c | 263 | void hpfs_truncate(struct inode *); |
4b6f5d20 | 264 | extern const struct file_operations hpfs_file_ops; |
92e1d5be | 265 | extern const struct inode_operations hpfs_file_iops; |
f5e54d6e | 266 | extern const struct address_space_operations hpfs_aops; |
1da177e4 LT |
267 | |
268 | /* inode.c */ | |
269 | ||
270 | void hpfs_init_inode(struct inode *); | |
271 | void hpfs_read_inode(struct inode *); | |
272 | void hpfs_write_inode(struct inode *); | |
273 | void hpfs_write_inode_nolock(struct inode *); | |
ca30bc99 | 274 | int hpfs_setattr(struct dentry *, struct iattr *); |
1da177e4 | 275 | void hpfs_write_if_changed(struct inode *); |
ea544009 | 276 | void hpfs_evict_inode(struct inode *); |
1da177e4 LT |
277 | |
278 | /* map.c */ | |
279 | ||
52576da3 AV |
280 | __le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); |
281 | __le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); | |
275f495d | 282 | void hpfs_prefetch_bitmap(struct super_block *, unsigned); |
7e7742ee | 283 | unsigned char *hpfs_load_code_page(struct super_block *, secno); |
28fe3c19 | 284 | __le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp); |
1da177e4 LT |
285 | struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); |
286 | struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); | |
287 | struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); | |
288 | dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino); | |
289 | ||
290 | /* name.c */ | |
291 | ||
292 | unsigned char hpfs_upcase(unsigned char *, unsigned char); | |
7e7742ee AV |
293 | int hpfs_chk_name(const unsigned char *, unsigned *); |
294 | unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); | |
295 | int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned, | |
296 | const unsigned char *, unsigned, int); | |
297 | int hpfs_is_name_long(const unsigned char *, unsigned); | |
298 | void hpfs_adjust_length(const unsigned char *, unsigned *); | |
1da177e4 LT |
299 | |
300 | /* namei.c */ | |
301 | ||
92e1d5be | 302 | extern const struct inode_operations hpfs_dir_iops; |
f5e54d6e | 303 | extern const struct address_space_operations hpfs_symlink_aops; |
1da177e4 LT |
304 | |
305 | static inline struct hpfs_inode_info *hpfs_i(struct inode *inode) | |
306 | { | |
307 | return list_entry(inode, struct hpfs_inode_info, vfs_inode); | |
308 | } | |
309 | ||
310 | static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb) | |
311 | { | |
312 | return sb->s_fs_info; | |
313 | } | |
314 | ||
315 | /* super.c */ | |
316 | ||
b9075fa9 JP |
317 | __printf(2, 3) |
318 | void hpfs_error(struct super_block *, const char *, ...); | |
1da177e4 | 319 | int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); |
2cbe5c76 | 320 | unsigned hpfs_get_free_dnodes(struct super_block *); |
1da177e4 LT |
321 | |
322 | /* | |
323 | * local time (HPFS) to GMT (Unix) | |
324 | */ | |
325 | ||
326 | static inline time_t local_to_gmt(struct super_block *s, time32_t t) | |
327 | { | |
328 | extern struct timezone sys_tz; | |
329 | return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift; | |
330 | } | |
331 | ||
332 | static inline time32_t gmt_to_local(struct super_block *s, time_t t) | |
333 | { | |
334 | extern struct timezone sys_tz; | |
335 | return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift; | |
336 | } | |
9a311b96 AB |
337 | |
338 | /* | |
339 | * Locking: | |
340 | * | |
7dd29d8d MP |
341 | * hpfs_lock() locks the whole filesystem. It must be taken |
342 | * on any method called by the VFS. | |
9a311b96 | 343 | * |
7dd29d8d MP |
344 | * We don't do any per-file locking anymore, it is hard to |
345 | * review and HPFS is not performance-sensitive anyway. | |
9a311b96 AB |
346 | */ |
347 | static inline void hpfs_lock(struct super_block *s) | |
348 | { | |
7dd29d8d MP |
349 | struct hpfs_sb_info *sbi = hpfs_sb(s); |
350 | mutex_lock(&sbi->hpfs_mutex); | |
9a311b96 AB |
351 | } |
352 | ||
353 | static inline void hpfs_unlock(struct super_block *s) | |
354 | { | |
7dd29d8d MP |
355 | struct hpfs_sb_info *sbi = hpfs_sb(s); |
356 | mutex_unlock(&sbi->hpfs_mutex); | |
357 | } | |
358 | ||
359 | static inline void hpfs_lock_assert(struct super_block *s) | |
360 | { | |
361 | struct hpfs_sb_info *sbi = hpfs_sb(s); | |
362 | WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex)); | |
9a311b96 | 363 | } |