安装extundelete ，安装方法参照 http://www.kuaiwenba.com/article/173.html
编译安装
./configure
Configuring extundelete 0.2.0
configure: error: Can't find ext2fs library
要安装相关依赖库 yum install e2fsprogs* e2fslibs* -y
make又报错
/usr/bin/ld: extundelete: undefined reference to symbol ‘__pthread_key_create@@GLIBC_2.2.5’
/usr/bin/ld: note: ‘__pthread_key_create@@GLIBC_2.2.5’ is defined in DSO /lib64/libpthread.so.0 so try adding it to the linker command line
解决方法见 http://www.caojunfei.com/?p=3582
安装好后运行
extundelete /dev/sda3 –inode 2
会报下面错误
/usr/local/extundelete/bin/extundelete: Bad magic number in super-block when trying to open filesystem /dev/sda3
悲剧，网上搜了下，lvm是有区别的，见 https://diogomonica.com/2012/08/05/raising-the-dead-undeleting-files-in-ext4/
主要是lvm的设备名不是/dev/sda的形式了vgscan查看具体的卷名。最后发现我的卷名是/dev/vg_centosdesktop/lv_root,好了，现在就可以恢复了
运行以下命令恢复单个文件
/usr/local/extundelete/bin/extundelete /dev/vg_centosdesktop/lv_root –restore-file /root/down/php-5.5.17/ext/C/C.c
恢复一个目录命令
/usr/local/extundelete/bin/extundelete /dev/vg_centosdesktop/lv_root –restore-directory /root/down/php-5.5.17/ext/C
全部搞定了，以后再不也不怕rm -rf 了
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