Viewing file:  devfs_fs_kernel.h (9.3 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
#ifndef _LINUX_DEVFS_FS_KERNEL_H
#define _LINUX_DEVFS_FS_KERNEL_H
#include <linux/fs.h>
#include <linux/config.h>
#include <linux/spinlock.h>
#include <linux/kdev_t.h>
#include <linux/types.h>
#include <asm/semaphore.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 to make 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_HIDE 0x002 /* Do not show entry in directory list */
#define DEVFS_FL_AUTO_DEVNUM 0x004 /* Automatically generate device number
*/
#define DEVFS_FL_AOPEN_NOTIFY 0x008 /* Asynchronously notify devfsd on open
*/
#define DEVFS_FL_REMOVABLE 0x010 /* This is a removable media device */
#define DEVFS_FL_WAIT 0x020 /* Wait for devfsd to finish */
#define DEVFS_FL_CURRENT_OWNER 0x040 /* Set initial ownership to current */
#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_DEVFS_FS
struct unique_numspace
{
spinlock_t init_lock;
unsigned char sem_initialised;
unsigned int num_free; /* Num free in bits */
unsigned int length; /* Array length in bytes */
unsigned long *bits;
struct semaphore semaphore;
};
#define UNIQUE_NUMBERSPACE_INITIALISER {SPIN_LOCK_UNLOCKED, 0, 0, 0, NULL}
extern void devfs_put (devfs_handle_t de);
extern devfs_handle_t devfs_register (devfs_handle_t dir, const char *name,
unsigned int flags,
unsigned int major, unsigned int minor,
umode_t mode, 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 flags, const char *link,
devfs_handle_t *handle, void *info);
extern devfs_handle_t devfs_mk_dir (devfs_handle_t dir, const char *name,
void *info);
extern devfs_handle_t devfs_get_handle (devfs_handle_t dir, const char *name,
unsigned int major,unsigned int minor,
char type, int traverse_symlinks);
extern devfs_handle_t devfs_find_handle (devfs_handle_t dir, const char *name,
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 void devfs_put_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, void *ops, void *info);
extern int devfs_alloc_major (char type);
extern void devfs_dealloc_major (char type, int major);
extern kdev_t devfs_alloc_devnum (char type);
extern void devfs_dealloc_devnum (char type, kdev_t devnum);
extern int devfs_alloc_unique_number (struct unique_numspace *space);
extern void devfs_dealloc_unique_number (struct unique_numspace *space,
int number);
extern void mount_devfs_fs (void);
#else /* CONFIG_DEVFS_FS */
struct unique_numspace
{
char dummy;
};
#define UNIQUE_NUMBERSPACE_INITIALISER {0}
static inline void devfs_put (devfs_handle_t de)
{
return;
}
static inline devfs_handle_t devfs_register (devfs_handle_t dir,
const char *name,
unsigned int flags,
unsigned int major,
unsigned int minor,
umode_t mode,
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 flags, const char *link,
devfs_handle_t *handle, void *info)
{
return 0;
}
static inline devfs_handle_t devfs_mk_dir (devfs_handle_t dir,
const char *name, void *info)
{
return NULL;
}
static inline devfs_handle_t devfs_get_handle (devfs_handle_t dir,
const char *name,
unsigned int major,
unsigned int minor,
char type,
int traverse_symlinks)
{
return NULL;
}
static inline devfs_handle_t devfs_find_handle (devfs_handle_t dir,
const char *name,
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 void devfs_put_ops (devfs_handle_t de)
{
return;
}
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)
{
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, void *ops, void *info)
{
return;
}
static inline int devfs_alloc_major (char type)
{
return -1;
}
static inline void devfs_dealloc_major (char type, int major)
{
return;
}
static inline kdev_t devfs_alloc_devnum (char type)
{
return NODEV;
}
static inline void devfs_dealloc_devnum (char type, kdev_t devnum)
{
return;
}
static inline int devfs_alloc_unique_number (struct unique_numspace *space)
{
return -1;
}
static inline void devfs_dealloc_unique_number (struct unique_numspace *space,
int number)
{
return;
}
static inline void mount_devfs_fs (void)
{
return;
}
#endif /* CONFIG_DEVFS_FS */
#endif /* _LINUX_DEVFS_FS_KERNEL_H */
|