关于mount的两个错误

1. mount: could not find any free loop device

解决方法:losetup -d /dev/loop7

2. umount: device is busy

解决方法一:

kill $(``/sbin/fuser -m /dev/sda3 2>/dev/null)

解决方法二:

umount -f /dev/sda3

umount -l /dev/sda3