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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 | * vfat shortname flags | |
13 | */ | |
14 | #define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */ | |
15 | #define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */ | |
16 | #define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */ | |
17 | #define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */ | |
18 | #define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */ | |
19 | ||
20 | struct fat_mount_options { | |
21 | uid_t fs_uid; | |
22 | gid_t fs_gid; | |
23 | unsigned short fs_fmask; | |
24 | unsigned short fs_dmask; | |
25 | unsigned short codepage; /* Codepage for shortname conversions */ | |
26 | char *iocharset; /* Charset used for filename input/display */ | |
27 | unsigned short shortname; /* flags for shortname display/create rule */ | |
28 | unsigned char name_check; /* r = relaxed, n = normal, s = strict */ | |
29 | unsigned short allow_utime;/* permission for setting the [am]time */ | |
30 | unsigned quiet:1, /* set = fake successful chmods and chowns */ | |
31 | showexec:1, /* set = only set x bit for com/exe/bat */ | |
32 | sys_immutable:1, /* set = system files are immutable */ | |
33 | dotsOK:1, /* set = hidden and system files are named '.filename' */ | |
34 | isvfat:1, /* 0=no vfat long filename support, 1=vfat support */ | |
35 | utf8:1, /* Use of UTF-8 character set (Default) */ | |
36 | unicode_xlate:1, /* create escape sequences for unhandled Unicode */ | |
37 | numtail:1, /* Does first alias have a numeric '~1' type tail? */ | |
38 | flush:1, /* write things quickly */ | |
39 | nocase:1, /* Does this need case conversion? 0=need case conversion*/ | |
40 | usefree:1, /* Use free_clusters for FAT32 */ | |
41 | tz_utc:1; /* Filesystem timestamps are in UTC */ | |
42 | }; | |
43 | ||
44 | #define FAT_HASH_BITS 8 | |
45 | #define FAT_HASH_SIZE (1UL << FAT_HASH_BITS) | |
46 | #define FAT_HASH_MASK (FAT_HASH_SIZE-1) | |
47 | ||
48 | /* | |
49 | * MS-DOS file system in-core superblock data | |
50 | */ | |
51 | struct msdos_sb_info { | |
52 | unsigned short sec_per_clus; /* sectors/cluster */ | |
53 | unsigned short cluster_bits; /* log2(cluster_size) */ | |
54 | unsigned int cluster_size; /* cluster size */ | |
55 | unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */ | |
56 | unsigned short fat_start; | |
57 | unsigned long fat_length; /* FAT start & length (sec.) */ | |
58 | unsigned long dir_start; | |
59 | unsigned short dir_entries; /* root dir start & entries */ | |
60 | unsigned long data_start; /* first data sector */ | |
61 | unsigned long max_cluster; /* maximum cluster number */ | |
62 | unsigned long root_cluster; /* first cluster of the root directory */ | |
63 | unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */ | |
64 | struct mutex fat_lock; | |
65 | unsigned int prev_free; /* previously allocated cluster number */ | |
66 | unsigned int free_clusters; /* -1 if undefined */ | |
67 | unsigned int free_clus_valid; /* is free_clusters valid? */ | |
68 | struct fat_mount_options options; | |
69 | struct nls_table *nls_disk; /* Codepage used on disk */ | |
70 | struct nls_table *nls_io; /* Charset used for input and display */ | |
71 | const void *dir_ops; /* Opaque; default directory operations */ | |
72 | int dir_per_block; /* dir entries per block */ | |
73 | int dir_per_block_bits; /* log2(dir_per_block) */ | |
74 | ||
75 | int fatent_shift; | |
76 | struct fatent_operations *fatent_ops; | |
77 | ||
78 | spinlock_t inode_hash_lock; | |
79 | struct hlist_head inode_hashtable[FAT_HASH_SIZE]; | |
80 | }; | |
81 | ||
82 | #define FAT_CACHE_VALID 0 /* special case for valid cache */ | |
83 | ||
84 | /* | |
85 | * MS-DOS file system inode data in memory | |
86 | */ | |
87 | struct msdos_inode_info { | |
88 | spinlock_t cache_lru_lock; | |
89 | struct list_head cache_lru; | |
90 | int nr_caches; | |
91 | /* for avoiding the race between fat_free() and fat_get_cluster() */ | |
92 | unsigned int cache_valid_id; | |
93 | ||
94 | loff_t mmu_private; | |
95 | int i_start; /* first cluster or 0 */ | |
96 | int i_logstart; /* logical first cluster */ | |
97 | int i_attrs; /* unused attribute bits */ | |
98 | loff_t i_pos; /* on-disk position of directory entry or 0 */ | |
99 | struct hlist_node i_fat_hash; /* hash by i_location */ | |
100 | struct inode vfs_inode; | |
101 | }; | |
102 | ||
103 | struct fat_slot_info { | |
104 | loff_t i_pos; /* on-disk position of directory entry */ | |
105 | loff_t slot_off; /* offset for slot or de start */ | |
106 | int nr_slots; /* number of slots + 1(de) in filename */ | |
107 | struct msdos_dir_entry *de; | |
108 | struct buffer_head *bh; | |
109 | }; | |
110 | ||
111 | static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb) | |
112 | { | |
113 | return sb->s_fs_info; | |
114 | } | |
115 | ||
116 | static inline struct msdos_inode_info *MSDOS_I(struct inode *inode) | |
117 | { | |
118 | return container_of(inode, struct msdos_inode_info, vfs_inode); | |
119 | } | |
120 | ||
121 | /* Return the FAT attribute byte for this inode */ | |
122 | static inline u8 fat_attr(struct inode *inode) | |
123 | { | |
124 | return ((inode->i_mode & S_IWUGO) ? ATTR_NONE : ATTR_RO) | | |
125 | (S_ISDIR(inode->i_mode) ? ATTR_DIR : ATTR_NONE) | | |
126 | MSDOS_I(inode)->i_attrs; | |
127 | } | |
128 | ||
129 | static inline unsigned char fat_checksum(const __u8 *name) | |
130 | { | |
131 | unsigned char s = name[0]; | |
132 | s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2]; | |
133 | s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4]; | |
134 | s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6]; | |
135 | s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8]; | |
136 | s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10]; | |
137 | return s; | |
138 | } | |
139 | ||
140 | static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus) | |
141 | { | |
142 | return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus | |
143 | + sbi->data_start; | |
144 | } | |
145 | ||
146 | static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len) | |
147 | { | |
148 | #ifdef __BIG_ENDIAN | |
149 | while (len--) { | |
150 | *dst++ = src[0] | (src[1] << 8); | |
151 | src += 2; | |
152 | } | |
153 | #else | |
154 | memcpy(dst, src, len * 2); | |
155 | #endif | |
156 | } | |
157 | ||
158 | static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len) | |
159 | { | |
160 | #ifdef __BIG_ENDIAN | |
161 | while (len--) { | |
162 | dst[0] = *src & 0x00FF; | |
163 | dst[1] = (*src & 0xFF00) >> 8; | |
164 | dst += 2; | |
165 | src++; | |
166 | } | |
167 | #else | |
168 | memcpy(dst, src, len * 2); | |
169 | #endif | |
170 | } | |
171 | ||
172 | /* fat/cache.c */ | |
173 | extern void fat_cache_inval_inode(struct inode *inode); | |
174 | extern int fat_get_cluster(struct inode *inode, int cluster, | |
175 | int *fclus, int *dclus); | |
176 | extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys, | |
177 | unsigned long *mapped_blocks); | |
178 | ||
179 | /* fat/dir.c */ | |
180 | extern const struct file_operations fat_dir_operations; | |
181 | extern int fat_search_long(struct inode *inode, const unsigned char *name, | |
182 | int name_len, struct fat_slot_info *sinfo); | |
183 | extern int fat_dir_empty(struct inode *dir); | |
184 | extern int fat_subdirs(struct inode *dir); | |
185 | extern int fat_scan(struct inode *dir, const unsigned char *name, | |
186 | struct fat_slot_info *sinfo); | |
187 | extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, | |
188 | struct msdos_dir_entry **de, loff_t *i_pos); | |
189 | extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts); | |
190 | extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots, | |
191 | struct fat_slot_info *sinfo); | |
192 | extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo); | |
193 | ||
194 | /* fat/fatent.c */ | |
195 | struct fat_entry { | |
196 | int entry; | |
197 | union { | |
198 | u8 *ent12_p[2]; | |
199 | __le16 *ent16_p; | |
200 | __le32 *ent32_p; | |
201 | } u; | |
202 | int nr_bhs; | |
203 | struct buffer_head *bhs[2]; | |
204 | }; | |
205 | ||
206 | static inline void fatent_init(struct fat_entry *fatent) | |
207 | { | |
208 | fatent->nr_bhs = 0; | |
209 | fatent->entry = 0; | |
210 | fatent->u.ent32_p = NULL; | |
211 | fatent->bhs[0] = fatent->bhs[1] = NULL; | |
212 | } | |
213 | ||
214 | static inline void fatent_set_entry(struct fat_entry *fatent, int entry) | |
215 | { | |
216 | fatent->entry = entry; | |
217 | fatent->u.ent32_p = NULL; | |
218 | } | |
219 | ||
220 | static inline void fatent_brelse(struct fat_entry *fatent) | |
221 | { | |
222 | int i; | |
223 | fatent->u.ent32_p = NULL; | |
224 | for (i = 0; i < fatent->nr_bhs; i++) | |
225 | brelse(fatent->bhs[i]); | |
226 | fatent->nr_bhs = 0; | |
227 | fatent->bhs[0] = fatent->bhs[1] = NULL; | |
228 | } | |
229 | ||
230 | extern void fat_ent_access_init(struct super_block *sb); | |
231 | extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent, | |
232 | int entry); | |
233 | extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent, | |
234 | int new, int wait); | |
235 | extern int fat_alloc_clusters(struct inode *inode, int *cluster, | |
236 | int nr_cluster); | |
237 | extern int fat_free_clusters(struct inode *inode, int cluster); | |
238 | extern int fat_count_free_clusters(struct super_block *sb); | |
239 | ||
240 | /* fat/file.c */ | |
241 | extern int fat_generic_ioctl(struct inode *inode, struct file *filp, | |
242 | unsigned int cmd, unsigned long arg); | |
243 | extern const struct file_operations fat_file_operations; | |
244 | extern const struct inode_operations fat_file_inode_operations; | |
245 | extern int fat_setattr(struct dentry * dentry, struct iattr * attr); | |
246 | extern void fat_truncate(struct inode *inode); | |
247 | extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry, | |
248 | struct kstat *stat); | |
249 | ||
250 | /* fat/inode.c */ | |
251 | extern void fat_attach(struct inode *inode, loff_t i_pos); | |
252 | extern void fat_detach(struct inode *inode); | |
253 | extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos); | |
254 | extern struct inode *fat_build_inode(struct super_block *sb, | |
255 | struct msdos_dir_entry *de, loff_t i_pos); | |
256 | extern int fat_sync_inode(struct inode *inode); | |
257 | extern int fat_fill_super(struct super_block *sb, void *data, int silent, | |
258 | const struct inode_operations *fs_dir_inode_ops, int isvfat); | |
259 | ||
260 | extern int fat_flush_inodes(struct super_block *sb, struct inode *i1, | |
261 | struct inode *i2); | |
262 | /* fat/misc.c */ | |
263 | extern void fat_fs_panic(struct super_block *s, const char *fmt, ...); | |
264 | extern void fat_clusters_flush(struct super_block *sb); | |
265 | extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster); | |
266 | extern int date_dos2unix(unsigned short time, unsigned short date, int tz_utc); | |
267 | extern void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date, | |
268 | int tz_utc); | |
269 | extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs); | |
270 | ||
271 | int fat_cache_init(void); | |
272 | void fat_cache_destroy(void); | |
273 | ||
274 | #endif /* !_FAT_H */ |