Re: [Cluster-devel] Question on LVB when the node that held EX lock crash

[Eric Ren]

On 11/16/2016 04:29 PM, Eric Ren wrote:

Hi David and all,

I am debugging an issue of ocfs2 that relates to LVB value. I will try to make it a pure DLM question:

Two nodes (N1, N2) try to truncate the same file(R1) concurrently.

N1                                         N2
lock(R1, EX)
changing LVB: x
                                              lock(R1, EX)
convert(R1, NULL)
flush LVB
                                              changing LVB: x -> y
                                              crash

Hmm, here should be a long story of DLM recovery;-)

Eric

convert(R1, EX)
get LVB
Qustion: what is the LVB then? x or y?
======

Is this a valid question? or am I missing something?

Looking forward your help;-)

Thanks,
Eric