Import of Linus's Linux 1.1.68

1 files changed, 194 insertions, 0 deletions

diff --git a/include/linux/msdos_fs.h b/include/linux/msdos_fs.h
new file mode 100644
index 000000000..dd6699a0d
--- /dev/null
+++ b/include/linux/msdos_fs.h
@@ -0,0 +1,194 @@
+#ifndef _LINUX_MSDOS_FS_H
+#define _LINUX_MSDOS_FS_H
+
+/*
+ * The MS-DOS filesystem constants/structures
+ */
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/fd.h>
+
+#define MSDOS_ROOT_INO  1 /* == MINIX_ROOT_INO */
+#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 MSDOS_DIR_BITS	5 /* log2(sizeof(struct msdos_dir_entry)) */
+
+#define MSDOS_SUPER_MAGIC 0x4d44 /* MD */
+
+#define FAT_CACHE    8 /* FAT cache size */
+
+#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 */
+
+#define ATTR_NONE    0 /* no attribute bits */
+#define ATTR_UNUSED  (ATTR_VOLUME | ATTR_ARCH | ATTR_SYS | ATTR_HIDDEN)
+	/* attribute bits that are copied "as is" */
+
+#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
+#define IS_FREE(n) (!*(n) || *(unsigned char *) (n) == DELETED_FLAG || \
+  *(unsigned char *) (n) == FD_FILL_BYTE)
+
+#define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)
+	/* valid file mode bits */
+
+#define MSDOS_SB(s) (&((s)->u.msdos_sb))
+#define MSDOS_I(i) (&((i)->u.msdos_i))
+
+#define MSDOS_NAME 11 /* maximum name length */
+#define MSDOS_DOT    ".          " /* ".", padded to MSDOS_NAME chars */
+#define MSDOS_DOTDOT "..         " /* "..", padded to MSDOS_NAME chars */
+
+#define MSDOS_FAT12 4078 /* maximum number of clusters in a 12 bit FAT */
+
+/*
+ * Conversion from and to little-endian byte order. (no-op on i386/i486)
+ *
+ * Naming: Ca_b_c, where a: F = from, T = to, b: LE = little-endian, BE = big-
+ * endian, c: W = word (16 bits), L = longword (32 bits)
+ */
+
+#define CF_LE_W(v) (v)
+#define CF_LE_L(v) (v)
+#define CT_LE_W(v) (v)
+#define CT_LE_L(v) (v)
+
+
+struct msdos_boot_sector {
+	char ignored[3];	    /* Boot strap short or near jump */
+	char system_id[8];	    /* Name - can be used to special case
+				       partition manager volumes */
+	unsigned char sector_size[2];/* bytes per logical sector */
+	unsigned char cluster_size; /* sectors/cluster */
+	unsigned short reserved;    /* reserved sectors */
+	unsigned char fats;	    /* number of FATs */
+	unsigned char dir_entries[2];/* root directory entries */
+	unsigned char sectors[2];   /* number of sectors */
+	unsigned char media;	    /* media code (unused) */
+	unsigned short fat_length;  /* sectors/FAT */
+	unsigned short secs_track;  /* sectors per track */
+	unsigned short heads;	    /* number of heads */
+	unsigned long hidden;	    /* hidden sectors (unused) */
+	unsigned long total_sect;   /* number of sectors (if sectors == 0) */
+};
+
+struct msdos_dir_entry {
+	char name[8],ext[3]; /* name and extension */
+	unsigned char attr;  /* attribute bits */
+	char unused[10];
+	unsigned short time,date,start; /* time, date and first cluster */
+	unsigned long size;  /* file size (in bytes) */
+};
+
+struct fat_cache {
+	int device; /* device number. 0 means unused. */
+	int ino; /* inode number. */
+	int file_cluster; /* cluster number in the file. */
+	int disk_cluster; /* cluster number on disk. */
+	struct fat_cache *next; /* next cache entry */
+};
+
+/* Determine whether this FS has kB-aligned data. */
+
+#define MSDOS_CAN_BMAP(mib) (!(((mib)->cluster_size & 1) || \
+    ((mib)->data_start & 1)))
+
+/* 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))
+
+/* Convert the UNIX mode to MS-DOS attribute bits. */
+
+#define MSDOS_MKATTR(m) ((m & S_IWUGO) ? ATTR_NONE : ATTR_RO)
+
+#ifdef __KERNEL__
+
+static inline struct buffer_head *msdos_sread(int dev,int sector)
+{
+	return bread(dev,sector,SECTOR_SIZE);
+}
+
+
+/* misc.c */
+
+extern void fs_panic(struct super_block *s,char *msg);
+extern int is_binary(char conversion,char *extension);
+extern void lock_creation(void);
+extern void unlock_creation(void);
+extern void lock_fat(struct super_block *sb);
+extern void unlock_fat(struct super_block *sb);
+extern int msdos_add_cluster(struct inode *inode);
+extern int date_dos2unix(unsigned short time,unsigned short date);
+extern void date_unix2dos(int unix_date,unsigned short *time,
+    unsigned short *date);
+extern int msdos_get_entry(struct inode *dir,loff_t *pos,struct buffer_head **bh,
+    struct msdos_dir_entry **de);
+extern int msdos_scan(struct inode *dir,char *name,struct buffer_head **res_bh,
+    struct msdos_dir_entry **res_de,int *ino);
+extern int msdos_parent_ino(struct inode *dir,int locked);
+extern int msdos_subdirs(struct inode *dir);
+
+/* fat.c */
+
+extern int fat_access(struct super_block *sb,int nr,int new_value);
+extern int msdos_smap(struct inode *inode,int sector);
+extern int fat_free(struct inode *inode,int skip);
+extern void cache_init(void);
+void cache_lookup(struct inode *inode,int cluster,int *f_clu,int *d_clu);
+void cache_add(struct inode *inode,int f_clu,int d_clu);
+void cache_inval_inode(struct inode *inode);
+void cache_inval_dev(int device);
+int get_cluster(struct inode *inode,int cluster);
+
+/* namei.c */
+
+extern int msdos_lookup(struct inode *dir,const char *name,int len,
+	struct inode **result);
+extern int msdos_create(struct inode *dir,const char *name,int len,int mode,
+	struct inode **result);
+extern int msdos_mkdir(struct inode *dir,const char *name,int len,int mode);
+extern int msdos_rmdir(struct inode *dir,const char *name,int len);
+extern int msdos_unlink(struct inode *dir,const char *name,int len);
+extern int msdos_unlink_umsdos(struct inode *dir,const char *name,int len);
+extern int msdos_rename(struct inode *old_dir,const char *old_name,int old_len,
+	struct inode *new_dir,const char *new_name,int new_len);
+
+/* inode.c */
+
+extern void msdos_put_inode(struct inode *inode);
+extern void msdos_put_super(struct super_block *sb);
+extern struct super_block *msdos_read_super(struct super_block *s,
+					    void *data,int);
+extern void msdos_statfs(struct super_block *sb,struct statfs *buf);
+extern int msdos_bmap(struct inode *inode,int block);
+extern void msdos_read_inode(struct inode *inode);
+extern void msdos_write_inode(struct inode *inode);
+extern int msdos_notify_change(struct inode *,struct iattr *);
+
+/* dir.c */
+
+extern struct inode_operations msdos_dir_inode_operations;
+extern int msdos_readdir (struct inode *inode, struct file *filp,
+	struct dirent *dirent, int count);
+/* file.c */
+
+extern struct inode_operations msdos_file_inode_operations;
+extern int msdos_file_read(struct inode *, struct file *, char *, int);
+extern int msdos_file_write(struct inode *, struct file *, char *, int);
+extern struct inode_operations msdos_file_inode_operations_no_bmap;
+
+extern void msdos_truncate(struct inode *inode);
+
+/* mmap.c */
+extern int msdos_mmap(struct inode *, struct file *, struct vm_area_struct *);
+
+#endif /* __KERNEL__ */
+
+#endif