#ifndef _LINUX_DEVFS_FS_KERNEL_H
#define _LINUX_DEVFS_FS_KERNEL_H

#include <linux/fs.h>
#include <linux/config.h>

#define DEVFS_SUPER_MAGIC                0x1373

#define IS_DEVFS_INODE(inode) (DEVFS_SUPER_MAGIC == (inode)->i_sb->s_magic)

#define DEVFS_MINOR(inode) \
    ({unsigned int m; /* evil GCC trickery */ \
      ((inode)->i_sb && \
       ((inode)->i_sb->s_magic==DEVFS_SUPER_MAGIC) && \
       (devfs_get_maj_min(devfs_get_handle_from_inode((inode)),NULL,&m)==0) \
      ) ? m : MINOR((inode)->r_dev); })


#define DEVFS_FL_NONE         0x000  /* This helps making code more readable */
#define DEVFS_FL_AUTO_OWNER   0x001  /* When a closed inode is opened the
					ownerships are set to the opening
					process and the protection is set to
					that given in <<mode>>. When the inode
					is closed, ownership reverts back to
					<<uid>> and <<gid>> and the protection
					is set to read-write for all         */
#define DEVFS_FL_SHOW_UNREG   0x002  /* Show unregistered entries in
					directory listings                   */
#define DEVFS_FL_HIDE         0x004  /* Do not show entry in directory list  */
#define DEVFS_FL_AUTO_DEVNUM  0x008  /* Automatically generate device number */
#define DEVFS_FL_AOPEN_NOTIFY 0x010  /* Asynchronously notify devfsd on open */
#define DEVFS_FL_REMOVABLE    0x020  /* This is a removable media device     */
#define DEVFS_FL_WAIT         0x040  /* Wait for devfsd to finish            */
#define DEVFS_FL_DEFAULT      DEVFS_FL_NONE


#define DEVFS_SPECIAL_CHR     0
#define DEVFS_SPECIAL_BLK     1

typedef struct devfs_entry * devfs_handle_t;


#ifdef CONFIG_BLK_DEV_INITRD
#  define ROOT_DEVICE_NAME ((real_root_dev ==ROOT_DEV) ? root_device_name:NULL)
#else
#  define ROOT_DEVICE_NAME root_device_name
#endif


#ifdef CONFIG_DEVFS_FS
extern devfs_handle_t devfs_register (devfs_handle_t dir,
				      const char *name, unsigned int namelen,
				      unsigned int flags,
				      unsigned int major, unsigned int minor,
				      umode_t mode, uid_t uid, gid_t gid,
				      void *ops, void *info);
extern void devfs_unregister (devfs_handle_t de);
extern int devfs_mk_symlink (devfs_handle_t dir,
			     const char *name, unsigned int namelen,
			     unsigned int flags,
			     const char *link, unsigned int linklength,
			     devfs_handle_t *handle, void *info);
extern devfs_handle_t devfs_mk_dir (devfs_handle_t dir, const char *name,
				    unsigned int namelen, void *info);
extern devfs_handle_t devfs_find_handle (devfs_handle_t dir,
					 const char *name,unsigned int namelen,
					 unsigned int major,unsigned int minor,
					 char type, int traverse_symlinks);
extern int devfs_get_flags (devfs_handle_t de, unsigned int *flags);
extern int devfs_set_flags (devfs_handle_t de, unsigned int flags);
extern int devfs_get_maj_min (devfs_handle_t de, 
			      unsigned int *major, unsigned int *minor);
extern devfs_handle_t devfs_get_handle_from_inode (struct inode *inode);
extern int devfs_generate_path (devfs_handle_t de, char *path, int buflen);
extern void *devfs_get_ops (devfs_handle_t de);
extern int devfs_set_file_size (devfs_handle_t de, unsigned long size);
extern void *devfs_get_info (devfs_handle_t de);
extern int devfs_set_info (devfs_handle_t de, void *info);
extern devfs_handle_t devfs_get_parent (devfs_handle_t de);
extern devfs_handle_t devfs_get_first_child (devfs_handle_t de);
extern devfs_handle_t devfs_get_next_sibling (devfs_handle_t de);
extern void devfs_auto_unregister (devfs_handle_t master,devfs_handle_t slave);
extern devfs_handle_t devfs_get_unregister_slave (devfs_handle_t master);
extern const char *devfs_get_name (devfs_handle_t de, unsigned int *namelen);
extern int devfs_register_chrdev (unsigned int major, const char *name,
				  struct file_operations *fops);
extern int devfs_register_blkdev (unsigned int major, const char *name,
				  struct block_device_operations *bdops);
extern int devfs_unregister_chrdev (unsigned int major, const char *name);
extern int devfs_unregister_blkdev (unsigned int major, const char *name);

extern void devfs_register_tape (devfs_handle_t de);
extern void devfs_register_series (devfs_handle_t dir, const char *format,
				   unsigned int num_entries,
				   unsigned int flags, unsigned int major,
				   unsigned int minor_start,
				   umode_t mode, uid_t uid, gid_t gid,
				   void *ops, void *info);

extern int init_devfs_fs (void);
extern void mount_devfs_fs (void);
extern void devfs_make_root (const char *name);
#else  /*  CONFIG_DEVFS_FS  */
static inline devfs_handle_t devfs_register (devfs_handle_t dir,
					     const char *name,
					     unsigned int namelen,
					     unsigned int flags,
					     unsigned int major,
					     unsigned int minor,
					     umode_t mode,
					     uid_t uid, gid_t gid,
					     void *ops, void *info)
{
    return NULL;
}
static inline void devfs_unregister (devfs_handle_t de)
{
    return;
}
static inline int devfs_mk_symlink (devfs_handle_t dir,
				    const char *name, unsigned int namelen,
				    unsigned int flags,
				    const char *link, unsigned int linklength,
				    devfs_handle_t *handle, void *info)
{
    return 0;
}
static inline devfs_handle_t devfs_mk_dir (devfs_handle_t dir,
					   const char *name,
					   unsigned int namelen, void *info)
{
    return NULL;
}
static inline devfs_handle_t devfs_find_handle (devfs_handle_t dir,
						const char *name,
						unsigned int namelen,
						unsigned int major,
						unsigned int minor,
						char type,
						int traverse_symlinks)
{
    return NULL;
}
static inline int devfs_get_flags (devfs_handle_t de, unsigned int *flags)
{
    return 0;
}
static inline int devfs_set_flags (devfs_handle_t de, unsigned int flags)
{
    return 0;
}
static inline int devfs_get_maj_min (devfs_handle_t de, 
				     unsigned int *major, unsigned int *minor)
{
    return 0;
}
static inline devfs_handle_t devfs_get_handle_from_inode (struct inode *inode)
{
    return NULL;
}
static inline int devfs_generate_path (devfs_handle_t de, char *path,
				       int buflen)
{
    return -ENOSYS;
}
static inline void *devfs_get_ops (devfs_handle_t de)
{
    return NULL;
}
static inline int devfs_set_file_size (devfs_handle_t de, unsigned long size)
{
    return -ENOSYS;
}
static inline void *devfs_get_info (devfs_handle_t de, unsigned long size)
{
    return NULL;
}
static inline int devfs_set_info (devfs_handle_t de, void *info)
{
    return 0;
}
static inline devfs_handle_t devfs_get_parent (devfs_handle_t de)
{
    return NULL;
}
static inline devfs_handle_t devfs_get_first_child (devfs_handle_t de)
{
    return NULL;
}
static inline devfs_handle_t devfs_get_next_sibling (devfs_handle_t de)
{
    return NULL;
}
static inline void devfs_auto_unregister (devfs_handle_t master,
					  devfs_handle_t slave)
{
    return;
}
static inline devfs_handle_t devfs_get_unregister_slave (devfs_handle_t master)
{
    return NULL;
}
static inline const char *devfs_get_name (devfs_handle_t de,
					  unsigned int *namelen)
{
    return NULL;
}
static inline int devfs_register_chrdev (unsigned int major, const char *name,
					 struct file_operations *fops)
{
    return register_chrdev (major, name, fops);
}
static inline int devfs_register_blkdev (unsigned int major, const char *name,
					 struct block_device_operations *bdops)
{
    return register_blkdev (major, name, bdops);
}
static inline int devfs_unregister_chrdev (unsigned int major,const char *name)
{
    return unregister_chrdev (major, name);
}
static inline int devfs_unregister_blkdev (unsigned int major,const char *name)
{
    return unregister_blkdev (major, name);
}

static inline void devfs_register_tape (devfs_handle_t de)
{
    return;
}

static inline void devfs_register_series (devfs_handle_t dir,
					  const char *format,
					  unsigned int num_entries,
					  unsigned int flags,
					  unsigned int major,
					  unsigned int minor_start,
					  umode_t mode, uid_t uid, gid_t gid,
					  void *ops, void *info)
{
    return;
}

static inline int init_devfs_fs (void)
{
    return 0;
}
static inline void mount_devfs_fs (void)
{
    return;
}
static inline void devfs_make_root (const char *name)
{
    return;
}
#endif  /*  CONFIG_DEVFS_FS  */

#endif  /*  _LINUX_DEVFS_FS_KERNEL_H  */