5 * MS-DOS file system in-core superblock data
8 struct fat_mount_options {
11 unsigned short fs_fmask;
12 unsigned short fs_dmask;
13 unsigned short codepage; /* Codepage for shortname conversions */
14 char *iocharset; /* Charset used for filename input/display */
15 unsigned short shortname; /* flags for shortname display/create rule */
16 unsigned char name_check; /* r = relaxed, n = normal, s = strict */
17 unsigned quiet:1, /* set = fake successful chmods and chowns */
18 showexec:1, /* set = only set x bit for com/exe/bat */
19 sys_immutable:1, /* set = system files are immutable */
20 dotsOK:1, /* set = hidden and system files are named '.filename' */
21 isvfat:1, /* 0=no vfat long filename support, 1=vfat support */
22 utf8:1, /* Use of UTF8 character set (Default) */
23 unicode_xlate:1, /* create escape sequences for unhandled Unicode */
24 numtail:1, /* Does first alias have a numeric '~1' type tail? */
25 atari:1, /* Use Atari GEMDOS variation of MS-DOS fs */
26 nocase:1; /* Does this need case conversion? 0=need case conversion*/
29 #define FAT_HASH_BITS 8
30 #define FAT_HASH_SIZE (1UL << FAT_HASH_BITS)
31 #define FAT_HASH_MASK (FAT_HASH_SIZE-1)
33 struct msdos_sb_info {
34 unsigned short sec_per_clus; /* sectors/cluster */
35 unsigned short cluster_bits; /* log2(cluster_size) */
36 unsigned int cluster_size; /* cluster size */
37 unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */
38 unsigned short fat_start;
39 unsigned long fat_length; /* FAT start & length (sec.) */
40 unsigned long dir_start;
41 unsigned short dir_entries; /* root dir start & entries */
42 unsigned long data_start; /* first data sector */
43 unsigned long clusters; /* number of clusters */
44 unsigned long root_cluster; /* first cluster of the root directory */
45 unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
46 struct semaphore fat_lock;
47 int prev_free; /* previously allocated cluster number */
48 int free_clusters; /* -1 if undefined */
49 struct fat_mount_options options;
50 struct nls_table *nls_disk; /* Codepage used on disk */
51 struct nls_table *nls_io; /* Charset used for input and display */
52 void *dir_ops; /* Opaque; default directory operations */
53 int dir_per_block; /* dir entries per block */
54 int dir_per_block_bits; /* log2(dir_per_block) */
56 spinlock_t inode_hash_lock;
57 struct hlist_head inode_hashtable[FAT_HASH_SIZE];