在过去的几周里，我遇到了许多严重的系统问题，并且一直在摸索原因。我现在已经确定这个问题是在根分区上没有剩余的 inode
$ df -i
Filesystem Inodes IUsed IFree IUse% Mounted on
/dev/sda6 732960 724565 8395 99% /
udev 125179 518 124661 1% /dev
tmpfs 127001 464 126537 1% /run
none 127001 4 126997 1% /run/lock
none 127001 8 126993 1% /run/shm
/dev/sda7 5234688 144639 5090049 3% /home
原因是什么？我发现其中的 400K 正在 /usr/src 中使用
$ ls /usr/src
linux-headers-3.2.0-25-generic linux-headers-3.2.0-33
linux-headers-3.2.0-25-generic-pae linux-headers-3.2.0-33-generic
linux-headers-3.2.0-26 linux-headers-3.2.0-33-generic-pae
linux-headers-3.2.0-26-generic linux-headers-3.2.0-35
linux-headers-3.2.0-26-generic-pae linux-headers-3.2.0-35-generic
linux-headers-3.2.0-27 linux-headers-3.2.0-35-generic-pae
linux-headers-3.2.0-27-generic linux-headers-3.2.0-36
linux-headers-3.2.0-27-generic-pae linux-headers-3.2.0-36-generic
linux-headers-3.2.0-29 linux-headers-3.2.0-36-generic-pae
linux-headers-3.2.0-29-generic linux-headers-3.2.0-39
linux-headers-3.2.0-29-generic-pae linux-headers-3.2.0-39-generic
linux-headers-3.2.0-30 linux-headers-3.2.0-39-generic-pae …