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 #include <linux/smp_lock.h>
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 */
55 unsigned i_conv : 2; /* (files) crlf->newline hackery */
56 unsigned i_ea_mode : 1; /* file's permission is stored in ea */
57 unsigned i_ea_uid : 1; /* file's uid is stored in ea */
58 unsigned i_ea_gid : 1; /* file's gid is stored in ea */
59 unsigned i_dirty : 1;
60 struct mutex i_mutex;
61 struct mutex i_parent_mutex;
62 loff_t **i_rddir_off;
63 struct inode vfs_inode;
64 };
65
66 struct hpfs_sb_info {
67 ino_t sb_root; /* inode number of root dir */
68 unsigned sb_fs_size; /* file system size, sectors */
69 unsigned sb_bitmaps; /* sector number of bitmap list */
70 unsigned sb_dirband_start; /* directory band start sector */
71 unsigned sb_dirband_size; /* directory band size, dnodes */
72 unsigned sb_dmap; /* sector number of dnode bit map */
73 unsigned sb_n_free; /* free blocks for statfs, or -1 */
74 unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */
75 uid_t sb_uid; /* uid from mount options */
76 gid_t sb_gid; /* gid from mount options */
77 umode_t sb_mode; /* mode from mount options */
78 unsigned sb_conv : 2; /* crlf->newline hackery */
79 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
80 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
81 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
82 unsigned sb_lowercase : 1; /* downcase filenames hackery */
83 unsigned sb_was_error : 1; /* there was an error, set dirty flag */
84 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
85 unsigned char *sb_cp_table; /* code page tables: */
86 /* 128 bytes uppercasing table & */
87 /* 128 bytes lowercasing table */
88 unsigned *sb_bmp_dir; /* main bitmap directory */
89 unsigned sb_c_bitmap; /* current bitmap */
90 unsigned sb_max_fwd_alloc; /* max forwad allocation */
91 struct semaphore hpfs_creation_de; /* when creating dirents, nobody else
92 can alloc blocks */
93 /*unsigned sb_mounting : 1;*/
94 int sb_timeshift;
95 };
96
97 /*
98 * conv= options
99 */
100
101 #define CONV_BINARY 0 /* no conversion */
102 #define CONV_TEXT 1 /* crlf->newline */
103 #define CONV_AUTO 2 /* decide based on file contents */
104
105 /* Four 512-byte buffers and the 2k block obtained by concatenating them */
106
107 struct quad_buffer_head {
108 struct buffer_head *bh[4];
109 void *data;
110 };
111
112 /* The b-tree down pointer from a dir entry */
113
114 static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
115 {
116 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
117 return *(dnode_secno *) ((void *) de + de->length - 4);
118 }
119
120 /* The first dir entry in a dnode */
121
122 static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
123 {
124 return (void *) dnode->dirent;
125 }
126
127 /* The end+1 of the dir entries */
128
129 static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
130 {
131 CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free));
132 return (void *) dnode + dnode->first_free;
133 }
134
135 /* The dir entry after dir entry de */
136
137 static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
138 {
139 CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length));
140 return (void *) de + de->length;
141 }
142
143 static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
144 {
145 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s);
146 }
147
148 static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
149 {
150 return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s);
151 }
152
153 static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
154 {
155 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen);
156 }
157
158 static inline secno ea_sec(struct extended_attribute *ea)
159 {
160 return *(secno *)((char *)ea + 9 + ea->namelen);
161 }
162
163 static inline secno ea_len(struct extended_attribute *ea)
164 {
165 return *(secno *)((char *)ea + 5 + ea->namelen);
166 }
167
168 static inline char *ea_data(struct extended_attribute *ea)
169 {
170 return (char *)((char *)ea + 5 + ea->namelen);
171 }
172
173 static inline unsigned de_size(int namelen, secno down_ptr)
174 {
175 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
176 }
177
178 static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
179 {
180 int a;
181 int n;
182 if (!dst || !src) return;
183 a = dst->down;
184 n = dst->not_8x3;
185 memcpy((char *)dst + 2, (char *)src + 2, 28);
186 dst->down = a;
187 dst->not_8x3 = n;
188 }
189
190 static inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n)
191 {
192 int i;
193 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
194 if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1;
195 for (i = 1; i < n; i++)
196 if (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1))
197 return i + 1;
198 return 0;
199 }
200
201 /* alloc.c */
202
203 int hpfs_chk_sectors(struct super_block *, secno, int, char *);
204 secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int);
205 int hpfs_alloc_if_possible(struct super_block *, secno);
206 void hpfs_free_sectors(struct super_block *, secno, unsigned);
207 int hpfs_check_free_dnodes(struct super_block *, int);
208 void hpfs_free_dnode(struct super_block *, secno);
209 struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int);
210 struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
211 struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
212
213 /* anode.c */
214
215 secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
216 secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
217 void hpfs_remove_btree(struct super_block *, struct bplus_header *);
218 int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
219 int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, char *);
220 void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
221 void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
222 void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
223
224 /* buffer.c */
225
226 void hpfs_lock_creation(struct super_block *);
227 void hpfs_unlock_creation(struct super_block *);
228 void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
229 void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
230 void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
231 void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
232 void hpfs_brelse4(struct quad_buffer_head *);
233 void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
234
235 /* dentry.c */
236
237 void hpfs_set_dentry_operations(struct dentry *);
238
239 /* dir.c */
240
241 struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
242 extern const struct file_operations hpfs_dir_ops;
243
244 /* dnode.c */
245
246 void hpfs_add_pos(struct inode *, loff_t *);
247 void hpfs_del_pos(struct inode *, loff_t *);
248 struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, unsigned char *, unsigned, secno);
249 int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, struct hpfs_dirent *, int);
250 int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
251 void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
252 dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
253 struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
254 struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, char *, unsigned, dnode_secno *, struct quad_buffer_head *);
255 void hpfs_remove_dtree(struct super_block *, dnode_secno);
256 struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
257
258 /* ea.c */
259
260 void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
261 int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
262 char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
263 void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int);
264
265 /* file.c */
266
267 int hpfs_file_fsync(struct file *, struct dentry *, int);
268 extern const struct file_operations hpfs_file_ops;
269 extern const struct inode_operations hpfs_file_iops;
270 extern const struct address_space_operations hpfs_aops;
271
272 /* inode.c */
273
274 void hpfs_init_inode(struct inode *);
275 void hpfs_read_inode(struct inode *);
276 void hpfs_write_inode(struct inode *);
277 void hpfs_write_inode_nolock(struct inode *);
278 int hpfs_notify_change(struct dentry *, struct iattr *);
279 void hpfs_write_if_changed(struct inode *);
280 void hpfs_delete_inode(struct inode *);
281
282 /* map.c */
283
284 unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
285 unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
286 char *hpfs_load_code_page(struct super_block *, secno);
287 secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
288 struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
289 struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
290 struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
291 dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
292
293 /* name.c */
294
295 unsigned char hpfs_upcase(unsigned char *, unsigned char);
296 int hpfs_chk_name(unsigned char *, unsigned *);
297 char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
298 int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int);
299 int hpfs_is_name_long(unsigned char *, unsigned);
300 void hpfs_adjust_length(unsigned char *, unsigned *);
301 void hpfs_decide_conv(struct inode *, unsigned char *, unsigned);
302
303 /* namei.c */
304
305 extern const struct inode_operations hpfs_dir_iops;
306 extern const struct address_space_operations hpfs_symlink_aops;
307
308 static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
309 {
310 return list_entry(inode, struct hpfs_inode_info, vfs_inode);
311 }
312
313 static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
314 {
315 return sb->s_fs_info;
316 }
317
318 /* super.c */
319
320 void hpfs_error(struct super_block *, const char *, ...)
321 __attribute__((format (printf, 2, 3)));
322 int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
323 unsigned hpfs_count_one_bitmap(struct super_block *, secno);
324
325 /*
326 * local time (HPFS) to GMT (Unix)
327 */
328
329 static inline time_t local_to_gmt(struct super_block *s, time32_t t)
330 {
331 extern struct timezone sys_tz;
332 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
333 }
334
335 static inline time32_t gmt_to_local(struct super_block *s, time_t t)
336 {
337 extern struct timezone sys_tz;
338 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
339 }
340
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