fuser -cu /usr/local/tomcat7/webapps/dsideal_yy/html/down/ fuser -ck /usr/local/tomcat7/webapps/dsideal_yy/html/down/ fuser -c /usr/local/tomcat7/webapps/dsideal_yy/html/down/ umount /usr/local/tomcat7/webapps/dsideal_yy/html/down/
将一个目录挂到另一个目录中：
mount --bind /data/down /usr/local/tomcat7/webapps/dsideal_yy/html/down
mount --bind /data/down2 /usr/local/tomcat7/webapps/dsideal_yy/html/down2