summaryrefslogtreecommitdiffstats
path: root/include/linux/msdos_fs.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/msdos_fs.h')
-rw-r--r--include/linux/msdos_fs.h412
1 files changed, 412 insertions, 0 deletions
diff --git a/include/linux/msdos_fs.h b/include/linux/msdos_fs.h
new file mode 100644
index 0000000..9a3d272
--- /dev/null
+++ b/include/linux/msdos_fs.h
@@ -0,0 +1,412 @@
+#ifndef _LINUX_MSDOS_FS_H
+#define _LINUX_MSDOS_FS_H
+
+/*
+ * The MS-DOS filesystem constants/structures
+ */
+#include <asm/byteorder.h>
+
+#define SECTOR_SIZE 512 /* sector size (bytes) */
+#define SECTOR_BITS 9 /* log2(SECTOR_SIZE) */
+#define MSDOS_DPB (MSDOS_DPS) /* dir entries per block */
+#define MSDOS_DPB_BITS 4 /* log2(MSDOS_DPB) */
+#define MSDOS_DPS (SECTOR_SIZE / sizeof(struct msdos_dir_entry))
+#define MSDOS_DPS_BITS 4 /* log2(MSDOS_DPS) */
+#define CF_LE_W(v) le16_to_cpu(v)
+#define CF_LE_L(v) le32_to_cpu(v)
+#define CT_LE_W(v) cpu_to_le16(v)
+#define CT_LE_L(v) cpu_to_le32(v)
+
+
+#define MSDOS_SUPER_MAGIC 0x4d44 /* MD */
+
+#define MSDOS_ROOT_INO 1 /* == MINIX_ROOT_INO */
+#define MSDOS_DIR_BITS 5 /* log2(sizeof(struct msdos_dir_entry)) */
+
+/* directory limit */
+#define FAT_MAX_DIR_ENTRIES (65536)
+#define FAT_MAX_DIR_SIZE (FAT_MAX_DIR_ENTRIES << MSDOS_DIR_BITS)
+
+#define ATTR_NONE 0 /* no attribute bits */
+#define ATTR_RO 1 /* read-only */
+#define ATTR_HIDDEN 2 /* hidden */
+#define ATTR_SYS 4 /* system */
+#define ATTR_VOLUME 8 /* volume label */
+#define ATTR_DIR 16 /* directory */
+#define ATTR_ARCH 32 /* archived */
+
+/* attribute bits that are copied "as is" */
+#define ATTR_UNUSED (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
+/* bits that are used by the Windows 95/Windows NT extended FAT */
+#define ATTR_EXT (ATTR_RO | ATTR_HIDDEN | ATTR_SYS | ATTR_VOLUME)
+
+#define CASE_LOWER_BASE 8 /* base is lower case */
+#define CASE_LOWER_EXT 16 /* extension is lower case */
+
+#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
+#define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG)
+
+/* valid file mode bits */
+#define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)
+/* Convert attribute bits and a mask to the UNIX mode. */
+#define MSDOS_MKMODE(a, m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO))
+
+#define MSDOS_NAME 11 /* maximum name length */
+#define MSDOS_LONGNAME 256 /* maximum name length */
+#define MSDOS_SLOTS 21 /* max # of slots for short and long names */
+#define MSDOS_DOT ". " /* ".", padded to MSDOS_NAME chars */
+#define MSDOS_DOTDOT ".. " /* "..", padded to MSDOS_NAME chars */
+
+/* media of boot sector */
+#define FAT_VALID_MEDIA(x) ((0xF8 <= (x) && (x) <= 0xFF) || (x) == 0xF0)
+#define FAT_FIRST_ENT(s, x) ((MSDOS_SB(s)->fat_bits == 32 ? 0x0FFFFF00 : \
+ MSDOS_SB(s)->fat_bits == 16 ? 0xFF00 : 0xF00) | (x))
+
+/* start of data cluster's entry (number of reserved clusters) */
+#define FAT_START_ENT 2
+
+/* maximum number of clusters */
+#define MAX_FAT12 0xFF4
+#define MAX_FAT16 0xFFF4
+#define MAX_FAT32 0x0FFFFFF6
+#define MAX_FAT(s) (MSDOS_SB(s)->fat_bits == 32 ? MAX_FAT32 : \
+ MSDOS_SB(s)->fat_bits == 16 ? MAX_FAT16 : MAX_FAT12)
+
+/* bad cluster mark */
+#define BAD_FAT12 0xFF7
+#define BAD_FAT16 0xFFF7
+#define BAD_FAT32 0x0FFFFFF7
+
+/* standard EOF */
+#define EOF_FAT12 0xFFF
+#define EOF_FAT16 0xFFFF
+#define EOF_FAT32 0x0FFFFFFF
+
+#define FAT_ENT_FREE (0)
+#define FAT_ENT_BAD (BAD_FAT32)
+#define FAT_ENT_EOF (EOF_FAT32)
+
+#define FAT_FSINFO_SIG1 0x41615252
+#define FAT_FSINFO_SIG2 0x61417272
+#define IS_FSINFO(x) (le32_to_cpu((x)->signature1) == FAT_FSINFO_SIG1 \
+ && le32_to_cpu((x)->signature2) == FAT_FSINFO_SIG2)
+
+/*
+ * ioctl commands
+ */
+#define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct dirent [2])
+#define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct dirent [2])
+/* <linux/videotext.h> has used 0x72 ('r') in collision, so skip a few */
+#define FAT_IOCTL_GET_ATTRIBUTES _IOR('r', 0x10, __u32)
+#define FAT_IOCTL_SET_ATTRIBUTES _IOW('r', 0x11, __u32)
+
+/*
+ * vfat shortname flags
+ */
+#define VFAT_SFN_DISPLAY_LOWER 0x0001 /* convert to lowercase for display */
+#define VFAT_SFN_DISPLAY_WIN95 0x0002 /* emulate win95 rule for display */
+#define VFAT_SFN_DISPLAY_WINNT 0x0004 /* emulate winnt rule for display */
+#define VFAT_SFN_CREATE_WIN95 0x0100 /* emulate win95 rule for create */
+#define VFAT_SFN_CREATE_WINNT 0x0200 /* emulate winnt rule for create */
+
+struct fat_boot_sector {
+ __u8 ignored[3]; /* Boot strap short or near jump */
+ __u8 system_id[8]; /* Name - can be used to special case
+ partition manager volumes */
+ __u8 sector_size[2]; /* bytes per logical sector */
+ __u8 sec_per_clus; /* sectors/cluster */
+ __le16 reserved; /* reserved sectors */
+ __u8 fats; /* number of FATs */
+ __u8 dir_entries[2]; /* root directory entries */
+ __u8 sectors[2]; /* number of sectors */
+ __u8 media; /* media code */
+ __le16 fat_length; /* sectors/FAT */
+ __le16 secs_track; /* sectors per track */
+ __le16 heads; /* number of heads */
+ __le32 hidden; /* hidden sectors (unused) */
+ __le32 total_sect; /* number of sectors (if sectors == 0) */
+
+ /* The following fields are only used by FAT32 */
+ __le32 fat32_length; /* sectors/FAT */
+ __le16 flags; /* bit 8: fat mirroring, low 4: active fat */
+ __u8 version[2]; /* major, minor filesystem version */
+ __le32 root_cluster; /* first cluster in root directory */
+ __le16 info_sector; /* filesystem info sector */
+ __le16 backup_boot; /* backup boot sector */
+ __le16 reserved2[6]; /* Unused */
+};
+
+struct fat_boot_fsinfo {
+ __le32 signature1; /* 0x41615252L */
+ __le32 reserved1[120]; /* Nothing as far as I can tell */
+ __le32 signature2; /* 0x61417272L */
+ __le32 free_clusters; /* Free cluster count. -1 if unknown */
+ __le32 next_cluster; /* Most recently allocated cluster */
+ __le32 reserved2[4];
+};
+
+struct msdos_dir_entry {
+ __u8 name[8],ext[3]; /* name and extension */
+ __u8 attr; /* attribute bits */
+ __u8 lcase; /* Case for base and extension */
+ __u8 ctime_cs; /* Creation time, centiseconds (0-199) */
+ __le16 ctime; /* Creation time */
+ __le16 cdate; /* Creation date */
+ __le16 adate; /* Last access date */
+ __le16 starthi; /* High 16 bits of cluster in FAT32 */
+ __le16 time,date,start;/* time, date and first cluster */
+ __le32 size; /* file size (in bytes) */
+};
+
+/* Up to 13 characters of the name */
+struct msdos_dir_slot {
+ __u8 id; /* sequence number for slot */
+ __u8 name0_4[10]; /* first 5 characters in name */
+ __u8 attr; /* attribute byte */
+ __u8 reserved; /* always 0 */
+ __u8 alias_checksum; /* checksum for 8.3 alias */
+ __u8 name5_10[12]; /* 6 more characters in name */
+ __le16 start; /* starting cluster number, 0 in long slots */
+ __u8 name11_12[4]; /* last 2 characters in name */
+};
+
+struct fat_slot_info {
+ loff_t i_pos; /* on-disk position of directory entry */
+ loff_t slot_off; /* offset for slot or de start */
+ int nr_slots; /* number of slots + 1(de) in filename */
+ struct msdos_dir_entry *de;
+ struct buffer_head *bh;
+};
+
+#ifdef __KERNEL__
+
+#include <linux/buffer_head.h>
+#include <linux/string.h>
+#include <linux/nls.h>
+#include <linux/fs.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 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 UTF8 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 */
+ nocase:1; /* Does this need case conversion? 0=need case conversion*/
+};
+
+#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 semaphore fat_lock;
+ unsigned int prev_free; /* previously allocated cluster number */
+ unsigned int free_clusters; /* -1 if undefined */
+ 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 */
+ 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 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
+}
+
+/* fat/cache.c */
+extern void fat_cache_inval_inode(struct inode *inode);
+extern int fat_get_cluster(struct inode *inode, int cluster,
+ int *fclus, int *dclus);
+extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys);
+
+/* fat/dir.c */
+extern struct file_operations fat_dir_operations;
+extern int fat_search_long(struct inode *inode, const unsigned char *name,
+ int name_len, struct fat_slot_info *sinfo);
+extern int fat_dir_empty(struct inode *dir);
+extern int fat_subdirs(struct inode *dir);
+extern int fat_scan(struct inode *dir, const unsigned char *name,
+ struct fat_slot_info *sinfo);
+extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh,
+ struct msdos_dir_entry **de, loff_t *i_pos);
+extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts);
+extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
+ struct fat_slot_info *sinfo);
+extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo);
+
+/* fat/fatent.c */
+struct fat_entry {
+ int entry;
+ union {
+ u8 *ent12_p[2];
+ __le16 *ent16_p;
+ __le32 *ent32_p;
+ } u;
+ int nr_bhs;
+ struct buffer_head *bhs[2];
+};
+
+static inline void fatent_init(struct fat_entry *fatent)
+{
+ fatent->nr_bhs = 0;
+ fatent->entry = 0;
+ fatent->u.ent32_p = NULL;
+ fatent->bhs[0] = fatent->bhs[1] = NULL;
+}
+
+static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
+{
+ fatent->entry = entry;
+ fatent->u.ent32_p = NULL;
+}
+
+static inline void fatent_brelse(struct fat_entry *fatent)
+{
+ int i;
+ fatent->u.ent32_p = NULL;
+ for (i = 0; i < fatent->nr_bhs; i++)
+ brelse(fatent->bhs[i]);
+ fatent->nr_bhs = 0;
+ fatent->bhs[0] = fatent->bhs[1] = NULL;
+}
+
+extern void fat_ent_access_init(struct super_block *sb);
+extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent,
+ int entry);
+extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent,
+ int new, int wait);
+extern int fat_alloc_clusters(struct inode *inode, int *cluster,
+ int nr_cluster);
+extern int fat_free_clusters(struct inode *inode, int cluster);
+extern int fat_count_free_clusters(struct super_block *sb);
+
+/* fat/file.c */
+extern int fat_generic_ioctl(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg);
+extern struct file_operations fat_file_operations;
+extern struct inode_operations fat_file_inode_operations;
+extern int fat_notify_change(struct dentry * dentry, struct iattr * attr);
+extern void fat_truncate(struct inode *inode);
+
+/* fat/inode.c */
+extern void fat_attach(struct inode *inode, loff_t i_pos);
+extern void fat_detach(struct inode *inode);
+extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos);
+extern struct inode *fat_build_inode(struct super_block *sb,
+ struct msdos_dir_entry *de, loff_t i_pos);
+extern int fat_sync_inode(struct inode *inode);
+extern int fat_fill_super(struct super_block *sb, void *data, int silent,
+ struct inode_operations *fs_dir_inode_ops, int isvfat);
+
+/* fat/misc.c */
+extern void fat_fs_panic(struct super_block *s, const char *fmt, ...);
+extern void fat_clusters_flush(struct super_block *sb);
+extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster);
+extern int date_dos2unix(unsigned short time, unsigned short date);
+extern void fat_date_unix2dos(int unix_date, __le16 *time, __le16 *date);
+extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs);
+
+#endif /* __KERNEL__ */
+
+#endif
OpenPOWER on IntegriCloud