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fat: Cleanup msdos_lookup()
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / fat / fat.h
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9e975dae
OH		 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
20struct 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)
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OH		 46
47/*
48 * MS-DOS file system in-core superblock data
49 */
50struct msdos_sb_info {
51 unsigned short sec_per_clus; /* sectors/cluster */
52 unsigned short cluster_bits; /* log2(cluster_size) */
53 unsigned int cluster_size; /* cluster size */
54 unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */
55 unsigned short fat_start;
56 unsigned long fat_length; /* FAT start & length (sec.) */
57 unsigned long dir_start;
58 unsigned short dir_entries; /* root dir start & entries */
59 unsigned long data_start; /* first data sector */
60 unsigned long max_cluster; /* maximum cluster number */
61 unsigned long root_cluster; /* first cluster of the root directory */
62 unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
63 struct mutex fat_lock;
64 unsigned int prev_free; /* previously allocated cluster number */
65 unsigned int free_clusters; /* -1 if undefined */
66 unsigned int free_clus_valid; /* is free_clusters valid? */
67 struct fat_mount_options options;
68 struct nls_table *nls_disk; /* Codepage used on disk */
69 struct nls_table *nls_io; /* Charset used for input and display */
70 const void *dir_ops; /* Opaque; default directory operations */
71 int dir_per_block; /* dir entries per block */
72 int dir_per_block_bits; /* log2(dir_per_block) */
73
74 int fatent_shift;
75 struct fatent_operations *fatent_ops;
76
77 spinlock_t inode_hash_lock;
78 struct hlist_head inode_hashtable[FAT_HASH_SIZE];
79};
80
81#define FAT_CACHE_VALID 0 /* special case for valid cache */
82
83/*
84 * MS-DOS file system inode data in memory
85 */
86struct msdos_inode_info {
87 spinlock_t cache_lru_lock;
88 struct list_head cache_lru;
89 int nr_caches;
90 /* for avoiding the race between fat_free() and fat_get_cluster() */
91 unsigned int cache_valid_id;
92
93 loff_t mmu_private;
94 int i_start; /* first cluster or 0 */
95 int i_logstart; /* logical first cluster */
96 int i_attrs; /* unused attribute bits */
97 loff_t i_pos; /* on-disk position of directory entry or 0 */
98 struct hlist_node i_fat_hash; /* hash by i_location */
99 struct inode vfs_inode;
100};
101
102struct fat_slot_info {
103 loff_t i_pos; /* on-disk position of directory entry */
104 loff_t slot_off; /* offset for slot or de start */
105 int nr_slots; /* number of slots + 1(de) in filename */
106 struct msdos_dir_entry *de;
107 struct buffer_head *bh;
108};
109
110static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb)
111{
112 return sb->s_fs_info;
113}
114
115static inline struct msdos_inode_info *MSDOS_I(struct inode *inode)
116{
117 return container_of(inode, struct msdos_inode_info, vfs_inode);
118}
119
120/* Return the FAT attribute byte for this inode */
121static inline u8 fat_attr(struct inode *inode)
122{
123 return ((inode->i_mode & S_IWUGO) ? ATTR_NONE : ATTR_RO) |
124 (S_ISDIR(inode->i_mode) ? ATTR_DIR : ATTR_NONE) |
125 MSDOS_I(inode)->i_attrs;
126}
127
128static inline unsigned char fat_checksum(const __u8 *name)
129{
130 unsigned char s = name[0];
131 s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2];
132 s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4];
133 s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6];
134 s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8];
135 s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10];
136 return s;
137}
138
139static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus)
140{
141 return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus
142 + sbi->data_start;
143}
144
145static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len)
146{
147#ifdef __BIG_ENDIAN
148 while (len--) {
149 *dst++ = src[0] | (src[1] << 8);
150 src += 2;
151 }
152#else
153 memcpy(dst, src, len * 2);
154#endif
155}
156
157static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len)
158{
159#ifdef __BIG_ENDIAN
160 while (len--) {
161 dst[0] = *src & 0x00FF;
162 dst[1] = (*src & 0xFF00) >> 8;
163 dst += 2;
164 src++;
165 }
166#else
167 memcpy(dst, src, len * 2);
168#endif
169}
170
171/* fat/cache.c */
172extern void fat_cache_inval_inode(struct inode *inode);
173extern int fat_get_cluster(struct inode *inode, int cluster,
174 int *fclus, int *dclus);
175extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
176 unsigned long *mapped_blocks);
177
178/* fat/dir.c */
179extern const struct file_operations fat_dir_operations;
180extern int fat_search_long(struct inode *inode, const unsigned char *name,
181 int name_len, struct fat_slot_info *sinfo);
182extern int fat_dir_empty(struct inode *dir);
183extern int fat_subdirs(struct inode *dir);
184extern int fat_scan(struct inode *dir, const unsigned char *name,
185 struct fat_slot_info *sinfo);
186extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
187 struct msdos_dir_entry **de, loff_t *i_pos);
188extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts);
189extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
190 struct fat_slot_info *sinfo);
191extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo);
192
193/* fat/fatent.c */
194struct fat_entry {
195 int entry;
196 union {
197 u8 *ent12_p[2];
198 __le16 *ent16_p;
199 __le32 *ent32_p;
200 } u;
201 int nr_bhs;
202 struct buffer_head *bhs[2];
203};
204
205static inline void fatent_init(struct fat_entry *fatent)
206{
207 fatent->nr_bhs = 0;
208 fatent->entry = 0;
209 fatent->u.ent32_p = NULL;
210 fatent->bhs[0] = fatent->bhs[1] = NULL;
211}
212
213static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
214{
215 fatent->entry = entry;
216 fatent->u.ent32_p = NULL;
217}
218
219static inline void fatent_brelse(struct fat_entry *fatent)
220{
221 int i;
222 fatent->u.ent32_p = NULL;
223 for (i = 0; i < fatent->nr_bhs; i++)
224 brelse(fatent->bhs[i]);
225 fatent->nr_bhs = 0;
226 fatent->bhs[0] = fatent->bhs[1] = NULL;
227}
228
229extern void fat_ent_access_init(struct super_block *sb);
230extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent,
231 int entry);
232extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent,
233 int new, int wait);
234extern int fat_alloc_clusters(struct inode *inode, int *cluster,
235 int nr_cluster);
236extern int fat_free_clusters(struct inode *inode, int cluster);
237extern int fat_count_free_clusters(struct super_block *sb);
238
239/* fat/file.c */
240extern int fat_generic_ioctl(struct inode *inode, struct file *filp,
241 unsigned int cmd, unsigned long arg);
242extern const struct file_operations fat_file_operations;
243extern const struct inode_operations fat_file_inode_operations;
244extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
245extern void fat_truncate(struct inode *inode);
246extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
247 struct kstat *stat);
248
249/* fat/inode.c */
250extern void fat_attach(struct inode *inode, loff_t i_pos);
251extern void fat_detach(struct inode *inode);
252extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos);
253extern struct inode *fat_build_inode(struct super_block *sb,
254 struct msdos_dir_entry *de, loff_t i_pos);
255extern int fat_sync_inode(struct inode *inode);
256extern int fat_fill_super(struct super_block *sb, void *data, int silent,
257 const struct inode_operations *fs_dir_inode_ops, int isvfat);
258
259extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
260 struct inode *i2);
261/* fat/misc.c */
262extern void fat_fs_panic(struct super_block *s, const char *fmt, ...);
263extern void fat_clusters_flush(struct super_block *sb);
264extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
7decd1cb
OH		 265extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts,
266 __le16 __time, __le16 __date, u8 time_cs);
267extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts,
268 __le16 *time, __le16 *date, u8 *time_cs);
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OH		 269extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);
270
271int fat_cache_init(void);
272void fat_cache_destroy(void);
273
274#endif /* !_FAT_H */
kernel source for telekom puls (alcatel/mediatek)