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gerrit-public.fairphone.software / kernel / msm-4.9 / 9e975dae2970d22557662761c8505ce9fd165684 / . / fs / fat / fat.h
blob: 51f1c42ca5e335252625aff86416bd2cf61ab890 [file] [log] [blame]
OGAWA Hirofumi9e975da2008-11-06 12:53:46 -0800[diff] [blame^]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)
46#define FAT_HASH_MASK (FAT_HASH_SIZE-1)
47
48/*
49 * MS-DOS file system in-core superblock data
50 */
51struct 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 */
87struct 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
103struct 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
111static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb)
112{
113 return sb->s_fs_info;
114}
115
116static 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 */
122static 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
129static 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
140static 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
146static 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
158static 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 */
173extern void fat_cache_inval_inode(struct inode *inode);
174extern int fat_get_cluster(struct inode *inode, int cluster,
175 int *fclus, int *dclus);
176extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys,
177 unsigned long *mapped_blocks);
178
179/* fat/dir.c */
180extern const struct file_operations fat_dir_operations;
181extern int fat_search_long(struct inode *inode, const unsigned char *name,
182 int name_len, struct fat_slot_info *sinfo);
183extern int fat_dir_empty(struct inode *dir);
184extern int fat_subdirs(struct inode *dir);
185extern int fat_scan(struct inode *dir, const unsigned char *name,
186 struct fat_slot_info *sinfo);
187extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
188 struct msdos_dir_entry **de, loff_t *i_pos);
189extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts);
190extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
191 struct fat_slot_info *sinfo);
192extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo);
193
194/* fat/fatent.c */
195struct 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
206static 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
214static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
215{
216 fatent->entry = entry;
217 fatent->u.ent32_p = NULL;
218}
219
220static 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
230extern void fat_ent_access_init(struct super_block *sb);
231extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent,
232 int entry);
233extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent,
234 int new, int wait);
235extern int fat_alloc_clusters(struct inode *inode, int *cluster,
236 int nr_cluster);
237extern int fat_free_clusters(struct inode *inode, int cluster);
238extern int fat_count_free_clusters(struct super_block *sb);
239
240/* fat/file.c */
241extern int fat_generic_ioctl(struct inode *inode, struct file *filp,
242 unsigned int cmd, unsigned long arg);
243extern const struct file_operations fat_file_operations;
244extern const struct inode_operations fat_file_inode_operations;
245extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
246extern void fat_truncate(struct inode *inode);
247extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
248 struct kstat *stat);
249
250/* fat/inode.c */
251extern void fat_attach(struct inode *inode, loff_t i_pos);
252extern void fat_detach(struct inode *inode);
253extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos);
254extern struct inode *fat_build_inode(struct super_block *sb,
255 struct msdos_dir_entry *de, loff_t i_pos);
256extern int fat_sync_inode(struct inode *inode);
257extern int fat_fill_super(struct super_block *sb, void *data, int silent,
258 const struct inode_operations *fs_dir_inode_ops, int isvfat);
259
260extern int fat_flush_inodes(struct super_block *sb, struct inode *i1,
261 struct inode *i2);
262/* fat/misc.c */
263extern void fat_fs_panic(struct super_block *s, const char *fmt, ...);
264extern void fat_clusters_flush(struct super_block *sb);
265extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
266extern int date_dos2unix(unsigned short time, unsigned short date, int tz_utc);
267extern void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date,
268 int tz_utc);
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 */