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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 | |
12 | #include <linux/mutex.h> |
13 | #include <linux/pagemap.h> |
14 | #include <linux/buffer_head.h> |
15 | #include <linux/slab.h> |
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 */ |
54 | unsigned i_conv : 2; /* (files) crlf->newline hackery */ |
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; |
59 | struct mutex i_mutex; |
60 | struct mutex i_parent_mutex; |
61 | loff_t **i_rddir_off; |
62 | struct inode vfs_inode; |
63 | }; |
64 | |
65 | struct hpfs_sb_info { |
66 | ino_t sb_root; /* inode number of root dir */ |
67 | unsigned sb_fs_size; /* file system size, sectors */ |
68 | unsigned sb_bitmaps; /* sector number of bitmap list */ |
69 | unsigned sb_dirband_start; /* directory band start sector */ |
70 | unsigned sb_dirband_size; /* directory band size, dnodes */ |
71 | unsigned sb_dmap; /* sector number of dnode bit map */ |
72 | unsigned sb_n_free; /* free blocks for statfs, or -1 */ |
73 | unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */ |
74 | uid_t sb_uid; /* uid from mount options */ |
75 | gid_t sb_gid; /* gid from mount options */ |
76 | umode_t sb_mode; /* mode from mount options */ |
77 | unsigned sb_conv : 2; /* crlf->newline hackery */ |
78 | unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */ |
79 | unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */ |
80 | unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */ |
81 | unsigned sb_lowercase : 1; /* downcase filenames hackery */ |
82 | unsigned sb_was_error : 1; /* there was an error, set dirty flag */ |
83 | unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */ |
84 | unsigned char *sb_cp_table; /* code page tables: */ |
85 | /* 128 bytes uppercasing table & */ |
86 | /* 128 bytes lowercasing table */ |
87 | unsigned *sb_bmp_dir; /* main bitmap directory */ |
88 | unsigned sb_c_bitmap; /* current bitmap */ |
89 | unsigned sb_max_fwd_alloc; /* max forwad allocation */ |
90 | struct semaphore hpfs_creation_de; /* when creating dirents, nobody else |
91 | can alloc blocks */ |
92 | /*unsigned sb_mounting : 1;*/ |
93 | int sb_timeshift; |
94 | }; |
95 | |
96 | /* |
97 | * conv= options |
98 | */ |
99 | |
100 | #define CONV_BINARY 0 /* no conversion */ |
101 | #define CONV_TEXT 1 /* crlf->newline */ |
102 | #define CONV_AUTO 2 /* decide based on file contents */ |
103 | |
104 | /* Four 512-byte buffers and the 2k block obtained by concatenating them */ |
105 | |
106 | struct quad_buffer_head { |
107 | struct buffer_head *bh[4]; |
108 | void *data; |
109 | }; |
110 | |
111 | /* The b-tree down pointer from a dir entry */ |
112 | |
113 | static inline dnode_secno de_down_pointer (struct hpfs_dirent *de) |
114 | { |
115 | CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n")); |
116 | return *(dnode_secno *) ((void *) de + de->length - 4); |
117 | } |
118 | |
119 | /* The first dir entry in a dnode */ |
120 | |
121 | static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode) |
122 | { |
123 | return (void *) dnode->dirent; |
124 | } |
125 | |
126 | /* The end+1 of the dir entries */ |
127 | |
128 | static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode) |
129 | { |
130 | CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free)); |
131 | return (void *) dnode + dnode->first_free; |
132 | } |
133 | |
134 | /* The dir entry after dir entry de */ |
135 | |
136 | static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de) |
137 | { |
138 | CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length)); |
139 | return (void *) de + de->length; |
140 | } |
141 | |
142 | static inline struct extended_attribute *fnode_ea(struct fnode *fnode) |
143 | { |
144 | return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s); |
145 | } |
146 | |
147 | static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode) |
148 | { |
149 | return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s); |
150 | } |
151 | |
152 | static inline struct extended_attribute *next_ea(struct extended_attribute *ea) |
153 | { |
154 | return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen); |
155 | } |
156 | |
157 | static inline secno ea_sec(struct extended_attribute *ea) |
158 | { |
159 | return *(secno *)((char *)ea + 9 + ea->namelen); |
160 | } |
161 | |
162 | static inline secno ea_len(struct extended_attribute *ea) |
163 | { |
164 | return *(secno *)((char *)ea + 5 + ea->namelen); |
165 | } |
166 | |
167 | static inline char *ea_data(struct extended_attribute *ea) |
168 | { |
169 | return (char *)((char *)ea + 5 + ea->namelen); |
170 | } |
171 | |
172 | static inline unsigned de_size(int namelen, secno down_ptr) |
173 | { |
174 | return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0); |
175 | } |
176 | |
177 | static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src) |
178 | { |
179 | int a; |
180 | int n; |
181 | if (!dst || !src) return; |
182 | a = dst->down; |
183 | n = dst->not_8x3; |
184 | memcpy((char *)dst + 2, (char *)src + 2, 28); |
185 | dst->down = a; |
186 | dst->not_8x3 = n; |
187 | } |
188 | |
189 | static inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n) |
190 | { |
191 | int i; |
192 | if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n; |
193 | if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1; |
194 | for (i = 1; i < n; i++) |
195 | if (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1)) |
196 | return i + 1; |
197 | return 0; |
198 | } |
199 | |
200 | /* alloc.c */ |
201 | |
202 | int hpfs_chk_sectors(struct super_block *, secno, int, char *); |
203 | secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int); |
204 | int hpfs_alloc_if_possible(struct super_block *, secno); |
205 | void hpfs_free_sectors(struct super_block *, secno, unsigned); |
206 | int hpfs_check_free_dnodes(struct super_block *, int); |
207 | void hpfs_free_dnode(struct super_block *, secno); |
208 | struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int); |
209 | struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **); |
210 | struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **); |
211 | |
212 | /* anode.c */ |
213 | |
214 | secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *); |
215 | secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned); |
216 | void hpfs_remove_btree(struct super_block *, struct bplus_header *); |
217 | int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *); |
218 | int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, char *); |
219 | void hpfs_ea_remove(struct super_block *, secno, int, unsigned); |
220 | void hpfs_truncate_btree(struct super_block *, secno, int, unsigned); |
221 | void hpfs_remove_fnode(struct super_block *, fnode_secno fno); |
222 | |
223 | /* buffer.c */ |
224 | |
225 | void hpfs_lock_creation(struct super_block *); |
226 | void hpfs_unlock_creation(struct super_block *); |
227 | void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int); |
228 | void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **); |
229 | void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int); |
230 | void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *); |
231 | void hpfs_brelse4(struct quad_buffer_head *); |
232 | void hpfs_mark_4buffers_dirty(struct quad_buffer_head *); |
233 | |
234 | /* dentry.c */ |
235 | |
236 | void hpfs_set_dentry_operations(struct dentry *); |
237 | |
238 | /* dir.c */ |
239 | |
240 | struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *); |
241 | extern const struct file_operations hpfs_dir_ops; |
242 | |
243 | /* dnode.c */ |
244 | |
245 | void hpfs_add_pos(struct inode *, loff_t *); |
246 | void hpfs_del_pos(struct inode *, loff_t *); |
247 | struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, unsigned char *, unsigned, secno); |
248 | int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, struct hpfs_dirent *, int); |
249 | int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int); |
250 | void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *); |
251 | dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno); |
252 | struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *); |
253 | struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, char *, unsigned, dnode_secno *, struct quad_buffer_head *); |
254 | void hpfs_remove_dtree(struct super_block *, dnode_secno); |
255 | struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *); |
256 | |
257 | /* ea.c */ |
258 | |
259 | void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned); |
260 | int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int); |
261 | char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *); |
262 | void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int); |
263 | |
264 | /* file.c */ |
265 | |
266 | int hpfs_file_fsync(struct file *, struct dentry *, int); |
267 | extern const struct file_operations hpfs_file_ops; |
268 | extern const struct inode_operations hpfs_file_iops; |
269 | extern const struct address_space_operations hpfs_aops; |
270 | |
271 | /* inode.c */ |
272 | |
273 | void hpfs_init_inode(struct inode *); |
274 | void hpfs_read_inode(struct inode *); |
275 | void hpfs_write_inode(struct inode *); |
276 | void hpfs_write_inode_nolock(struct inode *); |
277 | int hpfs_setattr(struct dentry *, struct iattr *); |
278 | void hpfs_write_if_changed(struct inode *); |
279 | void hpfs_delete_inode(struct inode *); |
280 | |
281 | /* map.c */ |
282 | |
283 | unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); |
284 | unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); |
285 | char *hpfs_load_code_page(struct super_block *, secno); |
286 | secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp); |
287 | struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); |
288 | struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); |
289 | struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); |
290 | dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino); |
291 | |
292 | /* name.c */ |
293 | |
294 | unsigned char hpfs_upcase(unsigned char *, unsigned char); |
295 | int hpfs_chk_name(unsigned char *, unsigned *); |
296 | char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); |
297 | int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int); |
298 | int hpfs_is_name_long(unsigned char *, unsigned); |
299 | void hpfs_adjust_length(unsigned char *, unsigned *); |
300 | void hpfs_decide_conv(struct inode *, unsigned char *, unsigned); |
301 | |
302 | /* namei.c */ |
303 | |
304 | extern const struct inode_operations hpfs_dir_iops; |
305 | extern const struct address_space_operations hpfs_symlink_aops; |
306 | |
307 | static inline struct hpfs_inode_info *hpfs_i(struct inode *inode) |
308 | { |
309 | return list_entry(inode, struct hpfs_inode_info, vfs_inode); |
310 | } |
311 | |
312 | static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb) |
313 | { |
314 | return sb->s_fs_info; |
315 | } |
316 | |
317 | /* super.c */ |
318 | |
319 | void hpfs_error(struct super_block *, const char *, ...) |
320 | __attribute__((format (printf, 2, 3))); |
321 | int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); |
322 | unsigned hpfs_count_one_bitmap(struct super_block *, secno); |
323 | |
324 | /* |
325 | * local time (HPFS) to GMT (Unix) |
326 | */ |
327 | |
328 | static inline time_t local_to_gmt(struct super_block *s, time32_t t) |
329 | { |
330 | extern struct timezone sys_tz; |
331 | return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift; |
332 | } |
333 | |
334 | static inline time32_t gmt_to_local(struct super_block *s, time_t t) |
335 | { |
336 | extern struct timezone sys_tz; |
337 | return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift; |
338 | } |
339 |
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