1#ifndef _FAT_H
2#define _FAT_H
3
4#include <linux/buffer_head.h>
5#include <linux/string.h>
6#include <linux/nls.h>
7#include <linux/fs.h>
8#include <linux/mutex.h>
9#include <linux/msdos_fs.h>
10
11
12
13
14#define VFAT_SFN_DISPLAY_LOWER 0x0001
15#define VFAT_SFN_DISPLAY_WIN95 0x0002
16#define VFAT_SFN_DISPLAY_WINNT 0x0004
17#define VFAT_SFN_CREATE_WIN95 0x0100
18#define VFAT_SFN_CREATE_WINNT 0x0200
19
20#define FAT_ERRORS_CONT 1
21#define FAT_ERRORS_PANIC 2
22#define FAT_ERRORS_RO 3
23
24struct fat_mount_options {
25 uid_t fs_uid;
26 gid_t fs_gid;
27 unsigned short fs_fmask;
28 unsigned short fs_dmask;
29 unsigned short codepage;
30 char *iocharset;
31 unsigned short shortname;
32 unsigned char name_check;
33 unsigned char errors;
34 unsigned short allow_utime;
35 unsigned quiet:1,
36 showexec:1,
37 sys_immutable:1,
38 dotsOK:1,
39 isvfat:1,
40 utf8:1,
41 unicode_xlate:1,
42 numtail:1,
43 flush:1,
44 nocase:1,
45 usefree:1,
46 tz_utc:1,
47 rodir:1;
48};
49
50#define FAT_HASH_BITS 8
51#define FAT_HASH_SIZE (1UL << FAT_HASH_BITS)
52
53
54
55
56struct msdos_sb_info {
57 unsigned short sec_per_clus;
58 unsigned short cluster_bits;
59 unsigned int cluster_size;
60 unsigned char fats,fat_bits;
61 unsigned short fat_start;
62 unsigned long fat_length;
63 unsigned long dir_start;
64 unsigned short dir_entries;
65 unsigned long data_start;
66 unsigned long max_cluster;
67 unsigned long root_cluster;
68 unsigned long fsinfo_sector;
69 struct mutex fat_lock;
70 unsigned int prev_free;
71 unsigned int free_clusters;
72 unsigned int free_clus_valid;
73 struct fat_mount_options options;
74 struct nls_table *nls_disk;
75 struct nls_table *nls_io;
76 const void *dir_ops;
77 int dir_per_block;
78 int dir_per_block_bits;
79
80 int fatent_shift;
81 struct fatent_operations *fatent_ops;
82 struct inode *fat_inode;
83
84 spinlock_t inode_hash_lock;
85 struct hlist_head inode_hashtable[FAT_HASH_SIZE];
86};
87
88#define FAT_CACHE_VALID 0
89
90
91
92
93struct msdos_inode_info {
94 spinlock_t cache_lru_lock;
95 struct list_head cache_lru;
96 int nr_caches;
97
98 unsigned int cache_valid_id;
99
100
101 loff_t mmu_private;
102
103 int i_start;
104 int i_logstart;
105 int i_attrs;
106 loff_t i_pos;
107 struct hlist_node i_fat_hash;
108 struct inode vfs_inode;
109};
110
111struct fat_slot_info {
112 loff_t i_pos;
113 loff_t slot_off;
114 int nr_slots;
115 struct msdos_dir_entry *de;
116 struct buffer_head *bh;
117};
118
119static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb)
120{
121 return sb->s_fs_info;
122}
123
124static inline struct msdos_inode_info *MSDOS_I(struct inode *inode)
125{
126 return container_of(inode, struct msdos_inode_info, vfs_inode);
127}
128
129
130
131
132
133
134
135
136static inline int fat_mode_can_hold_ro(struct inode *inode)
137{
138 struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb);
139 mode_t mask;
140
141 if (S_ISDIR(inode->i_mode)) {
142 if (!sbi->options.rodir)
143 return 0;
144 mask = ~sbi->options.fs_dmask;
145 } else
146 mask = ~sbi->options.fs_fmask;
147
148 if (!(mask & S_IWUGO))
149 return 0;
150 return 1;
151}
152
153
154static inline mode_t fat_make_mode(struct msdos_sb_info *sbi,
155 u8 attrs, mode_t mode)
156{
157 if (attrs & ATTR_RO && !((attrs & ATTR_DIR) && !sbi->options.rodir))
158 mode &= ~S_IWUGO;
159
160 if (attrs & ATTR_DIR)
161 return (mode & ~sbi->options.fs_dmask) | S_IFDIR;
162 else
163 return (mode & ~sbi->options.fs_fmask) | S_IFREG;
164}
165
166
167static inline u8 fat_make_attrs(struct inode *inode)
168{
169 u8 attrs = MSDOS_I(inode)->i_attrs;
170 if (S_ISDIR(inode->i_mode))
171 attrs |= ATTR_DIR;
172 if (fat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO))
173 attrs |= ATTR_RO;
174 return attrs;
175}
176
177static inline void fat_save_attrs(struct inode *inode, u8 attrs)
178{
179 if (fat_mode_can_hold_ro(inode))
180 MSDOS_I(inode)->i_attrs = attrs & ATTR_UNUSED;
181 else
182 MSDOS_I(inode)->i_attrs = attrs & (ATTR_UNUSED | ATTR_RO);
183}
184
185static inline unsigned char fat_checksum(const __u8 *name)
186{
187 unsigned char s = name[0];
188 s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2];
189 s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4];
190 s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6];
191 s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8];
192 s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10];
193 return s;
194}
195
196static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus)
197{
198 return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus
199 + sbi->data_start;
200}
201
202static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len)
203{
204#ifdef __BIG_ENDIAN
205 while (len--) {
206 *dst++ = src[0] | (src[1] << 8);
207 src += 2;
208 }
209#else
210 memcpy(dst, src, len * 2);
211#endif
212}
213
214static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len)
215{
216#ifdef __BIG_ENDIAN
217 while (len--) {
218 dst[0] = *src & 0x00FF;
219 dst[1] = (*src & 0xFF00) >> 8;
220 dst += 2;
221 src++;
222 }
223#else
224 memcpy(dst, src, len * 2);
225#endif
226}
227
228
229extern void fat_cache_inval_inode(struct inode *inode);
230extern int fat_get_cluster(struct inode *inode, int cluster,
231 int *fclus, int *dclus);
232extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
233 unsigned long *mapped_blocks, int create);
234
235
236extern const struct file_operations fat_dir_operations;
237extern int fat_search_long(struct inode *inode, const unsigned char *name,
238 int name_len, struct fat_slot_info *sinfo);
239extern int fat_dir_empty(struct inode *dir);
240extern int fat_subdirs(struct inode *dir);
241extern int fat_scan(struct inode *dir, const unsigned char *name,
242 struct fat_slot_info *sinfo);
243extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
244 struct msdos_dir_entry **de, loff_t *i_pos);
245extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts);
246extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
247 struct fat_slot_info *sinfo);
248extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo);
249
250
251struct fat_entry {
252 int entry;
253 union {
254 u8 *ent12_p[2];
255 __le16 *ent16_p;
256 __le32 *ent32_p;
257 } u;
258 int nr_bhs;
259 struct buffer_head *bhs[2];
260 struct inode *fat_inode;
261};
262
263static inline void fatent_init(struct fat_entry *fatent)
264{
265 fatent->nr_bhs = 0;
266 fatent->entry = 0;
267 fatent->u.ent32_p = NULL;
268 fatent->bhs[0] = fatent->bhs[1] = NULL;
269 fatent->fat_inode = NULL;
270}
271
272static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
273{
274 fatent->entry = entry;
275 fatent->u.ent32_p = NULL;
276}
277
278static inline void fatent_brelse(struct fat_entry *fatent)
279{
280 int i;
281 fatent->u.ent32_p = NULL;
282 for (i = 0; i < fatent->nr_bhs; i++)
283 brelse(fatent->bhs[i]);
284 fatent->nr_bhs = 0;
285 fatent->bhs[0] = fatent->bhs[1] = NULL;
286 fatent->fat_inode = NULL;
287}
288
289extern void fat_ent_access_init(struct super_block *sb);
290extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent,
291 int entry);
292extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent,
293 int new, int wait);
294extern int fat_alloc_clusters(struct inode *inode, int *cluster,
295 int nr_cluster);
296extern int fat_free_clusters(struct inode *inode, int cluster);
297extern int fat_count_free_clusters(struct super_block *sb);
298
299
300extern int fat_generic_ioctl(struct inode *inode, struct file *filp,
301 unsigned int cmd, unsigned long arg);
302extern const struct file_operations fat_file_operations;
303extern const struct inode_operations fat_file_inode_operations;
304extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
305extern void fat_truncate(struct inode *inode);
306extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
307 struct kstat *stat);
308extern int fat_file_fsync(struct file *file, struct dentry *dentry,
309 int datasync);
310
311
312extern void fat_attach(struct inode *inode, loff_t i_pos);
313extern void fat_detach(struct inode *inode);
314extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos);
315extern struct inode *fat_build_inode(struct super_block *sb,
316 struct msdos_dir_entry *de, loff_t i_pos);
317extern int fat_sync_inode(struct inode *inode);
318extern int fat_fill_super(struct super_block *sb, void *data, int silent,
319 const struct inode_operations *fs_dir_inode_ops, int isvfat);
320
321extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
322 struct inode *i2);
323
324extern void fat_fs_error(struct super_block *s, const char *fmt, ...)
325 __attribute__ ((format (printf, 2, 3))) __cold;
326extern int fat_clusters_flush(struct super_block *sb);
327extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
328extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
329 __le16 __time, __le16 __date, u8 time_cs);
330extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts,
331 __le16 *time, __le16 *date, u8 *time_cs);
332extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);
333
334int fat_cache_init(void);
335void fat_cache_destroy(void);
336
337
338typedef unsigned long long llu;
339
340#endif
341