gentoo编译内核时报“No space left on device”相关错误

今天在安装gentoo时安装内核时老报错，检查配置，怎么都没问题，奇怪
报错信息：
/bin/sh: net/xfrm/.tmp_xfrm_input.ver: No space left on device
make[2]: *** [net/xfrm/xfrm_input.o] Error 1
make[1]: *** [net/xfrm] Error 2
make[1]: *** Waiting for unfinished jobs....
  CC      net/sunrpc/svcauth.o
Assembler messages:
Fatal error: can't create net/sunrpc/.tmp_svcauth.o: No space left on device
make[2]: *** [net/sunrpc/svcauth.o] Error 2
make[2]: *** Waiting for unfinished jobs....
net/sunrpc/svcsock.c:1636:1: fatal error: opening dependency file net/sunrpc/.sv
compilation terminated.
make[2]: *** [net/sunrpc/svcsock.o] Error 1
make[1]: *** [net/sunrpc] Error 2
make: *** [net] Error 2
多次修改内核配置文件并编译，还是报错，仔细检查，发现有如下提示No space left on device
经万能的GOOGLE提示，原来是inode缺少报错
df -i /usr
Filesystem     Inodes  IUsed IFree IUse% Mounted on
-              262144 262143     1  100% /usr

参考相关：
http://baboon124.blog.51cto.com/428889/90130
http://blog.sina.com.cn/s/blog_4dd475390100c47m.html

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