-
-#include <linux/buffer_head.h>
-#include <linux/string.h>
-#include <linux/nls.h>
-#include <linux/fs.h>
-#include <linux/mutex.h>
-
-struct fat_mount_options {
- uid_t fs_uid;
- gid_t fs_gid;
- unsigned short fs_fmask;
- unsigned short fs_dmask;
- unsigned short codepage; /* Codepage for shortname conversions */
- char *iocharset; /* Charset used for filename input/display */
- unsigned short shortname; /* flags for shortname display/create rule */
- unsigned char name_check; /* r = relaxed, n = normal, s = strict */
- unsigned short allow_utime;/* permission for setting the [am]time */
- unsigned quiet:1, /* set = fake successful chmods and chowns */
- showexec:1, /* set = only set x bit for com/exe/bat */
- sys_immutable:1, /* set = system files are immutable */
- dotsOK:1, /* set = hidden and system files are named '.filename' */
- isvfat:1, /* 0=no vfat long filename support, 1=vfat support */
- utf8:1, /* Use of UTF-8 character set (Default) */
- unicode_xlate:1, /* create escape sequences for unhandled Unicode */
- numtail:1, /* Does first alias have a numeric '~1' type tail? */
- atari:1, /* Use Atari GEMDOS variation of MS-DOS fs */
- flush:1, /* write things quickly */
- nocase:1, /* Does this need case conversion? 0=need case conversion*/
- usefree:1; /* Use free_clusters for FAT32 */
-};
-
-#define FAT_HASH_BITS 8
-#define FAT_HASH_SIZE (1UL << FAT_HASH_BITS)
-#define FAT_HASH_MASK (FAT_HASH_SIZE-1)
-
-/*
- * MS-DOS file system in-core superblock data
- */
-struct msdos_sb_info {
- unsigned short sec_per_clus; /* sectors/cluster */
- unsigned short cluster_bits; /* log2(cluster_size) */
- unsigned int cluster_size; /* cluster size */
- unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */
- unsigned short fat_start;
- unsigned long fat_length; /* FAT start & length (sec.) */
- unsigned long dir_start;
- unsigned short dir_entries; /* root dir start & entries */
- unsigned long data_start; /* first data sector */
- unsigned long max_cluster; /* maximum cluster number */
- unsigned long root_cluster; /* first cluster of the root directory */
- unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
- struct mutex fat_lock;
- unsigned int prev_free; /* previously allocated cluster number */
- unsigned int free_clusters; /* -1 if undefined */
- unsigned int free_clus_valid; /* is free_clusters valid? */
- struct fat_mount_options options;
- struct nls_table *nls_disk; /* Codepage used on disk */
- struct nls_table *nls_io; /* Charset used for input and display */
- const void *dir_ops; /* Opaque; default directory operations */
- int dir_per_block; /* dir entries per block */
- int dir_per_block_bits; /* log2(dir_per_block) */
-
- int fatent_shift;
- struct fatent_operations *fatent_ops;
-
- spinlock_t inode_hash_lock;
- struct hlist_head inode_hashtable[FAT_HASH_SIZE];
-};
-
-#define FAT_CACHE_VALID 0 /* special case for valid cache */
-
-/*
- * MS-DOS file system inode data in memory
- */
-struct msdos_inode_info {
- spinlock_t cache_lru_lock;
- struct list_head cache_lru;
- int nr_caches;
- /* for avoiding the race between fat_free() and fat_get_cluster() */
- unsigned int cache_valid_id;
-
- loff_t mmu_private;
- int i_start; /* first cluster or 0 */
- int i_logstart; /* logical first cluster */
- int i_attrs; /* unused attribute bits */
- loff_t i_pos; /* on-disk position of directory entry or 0 */
- struct hlist_node i_fat_hash; /* hash by i_location */
- struct inode vfs_inode;
-};
-
-static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb)
-{
- return sb->s_fs_info;
-}
-
-static inline struct msdos_inode_info *MSDOS_I(struct inode *inode)
-{
- return container_of(inode, struct msdos_inode_info, vfs_inode);
-}
-
-/* Return the FAT attribute byte for this inode */
-static inline u8 fat_attr(struct inode *inode)
-{
- return ((inode->i_mode & S_IWUGO) ? ATTR_NONE : ATTR_RO) |
- (S_ISDIR(inode->i_mode) ? ATTR_DIR : ATTR_NONE) |
- MSDOS_I(inode)->i_attrs;
-}
-
-static inline unsigned char fat_checksum(const __u8 *name)
-{
- unsigned char s = name[0];
- s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2];
- s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4];
- s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6];
- s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8];
- s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10];
- return s;
-}
-
-static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus)
-{
- return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus
- + sbi->data_start;
-}
-
-static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len)
-{
-#ifdef __BIG_ENDIAN
- while (len--) {
- *dst++ = src[0] | (src[1] << 8);
- src += 2;
- }
-#else
- memcpy(dst, src, len * 2);
-#endif
-}
-
-static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len)
-{
-#ifdef __BIG_ENDIAN
- while (len--) {
- dst[0] = *src & 0x00FF;
- dst[1] = (*src & 0xFF00) >> 8;
- dst += 2;
- src++;
- }
-#else
- memcpy(dst, src, len * 2);
-#endif
-}
-