Import changeset

1 files changed, 250 insertions, 0 deletions

diff --git a/include/linux/devfs_fs_kernel.h b/include/linux/devfs_fs_kernel.h
new file mode 100644
index 000000000000..4db152030375
--- /dev/null
+++ b/include/linux/devfs_fs_kernel.h
@@ -0,0 +1,250 @@
+#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 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_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_NO_PERSISTENCE 0x080 /* Forget changes after unregister     */
+#define DEVFS_FL_CURRENT_OWNER  0x100 /* 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_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 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_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 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 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 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_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 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, 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  */