+#ifdef CONFIG_PROC_FS
+static int ext4_ui_proc_show(struct seq_file *m, void *v)
+{
+ unsigned int *p = m->private;
+
+ seq_printf(m, "%u\n", *p);
+ return 0;
+}
+
+static int ext4_ui_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ext4_ui_proc_show, PDE(inode)->data);
+}
+
+static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf,
+ size_t cnt, loff_t *ppos)
+{
+ unsigned int *p = PDE(file->f_path.dentry->d_inode)->data;
+ char str[32];
+ unsigned long value;
+
+ if (cnt >= sizeof(str))
+ return -EINVAL;
+ if (copy_from_user(str, buf, cnt))
+ return -EFAULT;
+ value = simple_strtol(str, NULL, 0);
+ if (value < 0)
+ return -ERANGE;
+ *p = value;
+ return cnt;
+}
+
+const struct file_operations ext4_ui_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = ext4_ui_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = ext4_ui_proc_write,
+};
+#endif
+
+static struct file_system_type ext4_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "ext4",
+ .get_sb = ext4_get_sb,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+
+#ifdef CONFIG_EXT4DEV_COMPAT
+static int ext4dev_get_sb(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data, struct vfsmount *mnt)
+{
+ printk(KERN_WARNING "EXT4-fs: Update your userspace programs "
+ "to mount using ext4\n");
+ printk(KERN_WARNING "EXT4-fs: ext4dev backwards compatibility "
+ "will go away by 2.6.31\n");
+ return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt);
+}
+