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9#ifndef _FAT_H_
10#define _FAT_H_
11
12#include <fs.h>
13#include <asm/byteorder.h>
14#include <asm/cache.h>
15
16struct disk_partition;
17
18
19#define VFAT_MAXLEN_BYTES 256
20#define VFAT_MAXSEQ 9
21#define PREFETCH_BLOCKS 2
22
23#define MAX_CLUSTSIZE CONFIG_FS_FAT_MAX_CLUSTSIZE
24
25#define DIRENTSPERCLUST ((mydata->clust_size * mydata->sect_size) / \
26 sizeof(dir_entry))
27
28#define FATBUFBLOCKS 6
29#define FATBUFSIZE (mydata->sect_size * FATBUFBLOCKS)
30#define FAT12BUFSIZE ((FATBUFSIZE*2)/3)
31#define FAT16BUFSIZE (FATBUFSIZE/2)
32#define FAT32BUFSIZE (FATBUFSIZE/4)
33
34
35#define MAX_LFN_SLOT 20
36
37
38#define FAT12_SIGN "FAT12 "
39#define FAT16_SIGN "FAT16 "
40#define FAT32_SIGN "FAT32 "
41#define SIGNLEN 8
42
43
44#define ATTR_RO 1
45#define ATTR_HIDDEN 2
46#define ATTR_SYS 4
47#define ATTR_VOLUME 8
48#define ATTR_DIR 16
49#define ATTR_ARCH 32
50
51#define ATTR_VFAT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
52
53#define DELETED_FLAG ((char)0xe5)
54#define aRING 0x05
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58
59
60#define LAST_LONG_ENTRY_MASK 0x40
61
62#define ISDIRDELIM(c) ((c) == '/' || (c) == '\\')
63
64#define FSTYPE_NONE (-1)
65
66#if defined(__linux__) && defined(__KERNEL__)
67#define FAT2CPU16 le16_to_cpu
68#define FAT2CPU32 le32_to_cpu
69#else
70#if __LITTLE_ENDIAN
71#define FAT2CPU16(x) (x)
72#define FAT2CPU32(x) (x)
73#else
74#define FAT2CPU16(x) ((((x) & 0x00ff) << 8) | (((x) & 0xff00) >> 8))
75#define FAT2CPU32(x) ((((x) & 0x000000ff) << 24) | \
76 (((x) & 0x0000ff00) << 8) | \
77 (((x) & 0x00ff0000) >> 8) | \
78 (((x) & 0xff000000) >> 24))
79#endif
80#endif
81
82#define START(dent) (FAT2CPU16((dent)->start) \
83 + (mydata->fatsize != 32 ? 0 : \
84 (FAT2CPU16((dent)->starthi) << 16)))
85#define IS_LAST_CLUST(x, fatsize) ((x) >= ((fatsize) != 32 ? \
86 ((fatsize) != 16 ? 0xff8 : 0xfff8) : \
87 0xffffff8))
88#define CHECK_CLUST(x, fatsize) ((x) <= 1 || \
89 (x) >= ((fatsize) != 32 ? \
90 ((fatsize) != 16 ? 0xff0 : 0xfff0) : \
91 0xffffff0))
92
93typedef struct boot_sector {
94 __u8 ignored[3];
95 char system_id[8];
96 __u8 sector_size[2];
97 __u8 cluster_size;
98 __u16 reserved;
99 __u8 fats;
100 __u8 dir_entries[2];
101 __u8 sectors[2];
102 __u8 media;
103 __u16 fat_length;
104 __u16 secs_track;
105 __u16 heads;
106 __u32 hidden;
107 __u32 total_sect;
108
109
110 __u32 fat32_length;
111 __u16 flags;
112 __u8 version[2];
113 __u32 root_cluster;
114 __u16 info_sector;
115 __u16 backup_boot;
116 __u16 reserved2[6];
117} boot_sector;
118
119typedef struct volume_info
120{
121 __u8 drive_number;
122 __u8 reserved;
123 __u8 ext_boot_sign;
124 __u8 volume_id[4];
125 char volume_label[11];
126 char fs_type[8];
127
128
129} volume_info;
130
131
132#define CASE_LOWER_BASE 8
133#define CASE_LOWER_EXT 16
134
135struct nameext {
136 char name[8];
137 char ext[3];
138};
139
140typedef struct dir_entry {
141 struct nameext nameext;
142 __u8 attr;
143 __u8 lcase;
144 __u8 ctime_ms;
145 __u16 ctime;
146 __u16 cdate;
147 __u16 adate;
148 __u16 starthi;
149 __u16 time,date,start;
150 __u32 size;
151} dir_entry;
152
153typedef struct dir_slot {
154 __u8 id;
155 __u8 name0_4[10];
156 __u8 attr;
157 __u8 reserved;
158 __u8 alias_checksum;
159 __u8 name5_10[12];
160 __u16 start;
161 __u8 name11_12[4];
162} dir_slot;
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168
169
170typedef struct {
171 __u8 *fatbuf;
172 int fatsize;
173 __u32 fatlength;
174 __u16 fat_sect;
175 __u8 fat_dirty;
176 __u32 rootdir_sect;
177 __u16 sect_size;
178 __u16 clust_size;
179 int data_begin;
180 int fatbufnum;
181 int rootdir_size;
182 __u32 root_cluster;
183 u32 total_sect;
184 int fats;
185} fsdata;
186
187struct fat_itr;
188typedef struct fat_itr fat_itr;
189
190static inline u32 clust_to_sect(fsdata *fsdata, u32 clust)
191{
192 return fsdata->data_begin + clust * fsdata->clust_size;
193}
194
195static inline u32 sect_to_clust(fsdata *fsdata, int sect)
196{
197 return (sect - fsdata->data_begin) / fsdata->clust_size;
198}
199
200int file_fat_detectfs(void);
201int fat_exists(const char *filename);
202int fat_size(const char *filename, loff_t *size);
203int file_fat_read_at(const char *filename, loff_t pos, void *buffer,
204 loff_t maxsize, loff_t *actread);
205int file_fat_read(const char *filename, void *buffer, int maxsize);
206int fat_set_blk_dev(struct blk_desc *rbdd, struct disk_partition *info);
207int fat_register_device(struct blk_desc *dev_desc, int part_no);
208
209int file_fat_write(const char *filename, void *buf, loff_t offset, loff_t len,
210 loff_t *actwrite);
211int fat_read_file(const char *filename, void *buf, loff_t offset, loff_t len,
212 loff_t *actread);
213int fat_opendir(const char *filename, struct fs_dir_stream **dirsp);
214int fat_readdir(struct fs_dir_stream *dirs, struct fs_dirent **dentp);
215void fat_closedir(struct fs_dir_stream *dirs);
216int fat_unlink(const char *filename);
217int fat_mkdir(const char *dirname);
218void fat_close(void);
219void *fat_next_cluster(fat_itr *itr, unsigned int *nbytes);
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230int fat_uuid(char *uuid_str);
231
232#endif
233