[Crash-utility] crash: vz extension for OpenVZ kernels

Dear Dave, I've prepared vz crash extension with commands useful for troubleshooting of OpenVZ kernel crashes. Could you please review the patch and advise how it's better to distribute this extension. vz extension uses openVZ-specific kernel structures and works on OpenVZ kernels only. It implements vzlist, vzps and ctid commands: vzlist -- shows list of OpenVZ containers, contains Container ID, references to ve_struct and parent task inside container. crash> vzlist CTID VE_STRUCT TASK PID COMM 121 ffff8801491e7000 ffff8801493d0ff0 95990 init 123 ffff880135a37000 ffff8803fb0a3470 95924 init 321 ffff88045a778000 ffff880400616300 95923 init 700 ffff88019ddae000 ffff88019ddd4fb0 95882 init 503 ffff88045a84e800 ffff8803c3c782c0 95902 init 122 ffff8804004ea000 ffff88045612afb0 95886 init 600 ffff88016e467000 ffff880459d653f0 95885 init 0 ffffffff81aaa220 ffff88045e530b30 1 init vzps -- shows list of processes inside of specified container crash> vzps -E 121 CTID PID TASK COMM 121 95990 ffff8801493d0ff0 init 121 95996 ffff8803c3e3b0f0 kthreadd/121 121 95997 ffff8803cd3aacb0 khelper/121 121 97267 ffff880405e4b2f0 udevd 121 99341 ffff8803c3fd2440 syslogd 121 99404 ffff880405e0c2c0 klogd 121 99424 ffff8803fb0f68c0 sshd 121 99445 ffff8801493d0500 xinetd 121 99557 ffff8804599f9230 sendmail 121 99568 ffff8804591b00c0 sendmail 121 99583 ffff880203e56f30 httpd 121 99594 ffff88016e4e01c0 crond 121 99614 ffff8803fb26cf70 xfs 121 99624 ffff88045a6ce2c0 saslauthd 121 99625 ffff8801ce134ff0 saslauthd 121 248691 ffff88040e2ee9c0 httpd ctid -- shows ContainerID for given task crash> ctid 99614 CTID PID TASK COMM 121 99614 ffff8803fb26cf70 xfs Thank you, Vasily Averin