static int binderfs_binder_ctl_create()

in binderfs.c [404:472]

• 56 lines of code
• 7 McCabe index (conditional complexity)

static int binderfs_binder_ctl_create(struct super_block *sb)
{
	int minor, ret;
	struct dentry *dentry;
	struct binder_device *device;
	struct inode *inode = NULL;
	struct dentry *root = sb->s_root;
	struct binderfs_info *info = sb->s_fs_info;
#if defined(CONFIG_IPC_NS)
	bool use_reserve = (info->ipc_ns == &init_ipc_ns);
#else
	bool use_reserve = true;
#endif

	device = kzalloc(sizeof(*device), GFP_KERNEL);
	if (!device)
		return -ENOMEM;

	/* If we have already created a binder-control node, return. */
	if (info->control_dentry) {
		ret = 0;
		goto out;
	}

	ret = -ENOMEM;
	inode = new_inode(sb);
	if (!inode)
		goto out;

	/* Reserve a new minor number for the new device. */
	mutex_lock(&binderfs_minors_mutex);
	minor = ida_alloc_max(&binderfs_minors,
			      use_reserve ? BINDERFS_MAX_MINOR :
					    BINDERFS_MAX_MINOR_CAPPED,
			      GFP_KERNEL);
	mutex_unlock(&binderfs_minors_mutex);
	if (minor < 0) {
		ret = minor;
		goto out;
	}

	inode->i_ino = SECOND_INODE;
	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
	init_special_inode(inode, S_IFCHR | 0600,
			   MKDEV(MAJOR(binderfs_dev), minor));
	inode->i_fop = &binder_ctl_fops;
	inode->i_uid = info->root_uid;
	inode->i_gid = info->root_gid;

	refcount_set(&device->ref, 1);
	device->binderfs_inode = inode;
	device->miscdev.minor = minor;

	dentry = d_alloc_name(root, "binder-control");
	if (!dentry)
		goto out;

	inode->i_private = device;
	info->control_dentry = dentry;
	d_add(dentry, inode);

	return 0;

out:
	kfree(device);
	iput(inode);

	return ret;
}