[Ocfs2-devel] lvb length issue [was Re: [ocfs2-tools-devel] question of ocfs2_controld (Jun 27)]

[David Teigland]

On Mon, Jul 06, 2009 at 08:26:39PM +0800, Coly Li wrote:
> DLM_USER_LVB_LEN is defined to 32.

> DLM_LVB_LEN is 64.

Yes, the kernel dlm api allows a variable lvb size, but the user dlm api fixes
it at 32.

Do you need to actually use a 64 byte lvb from userspace?  Or do you just need
to create the locksapce with a 64 byte lvb?  We could add a flag to work
around the later fairly easily.  Changing the dlm user/kernel interface to
copy variable size lvb's would take some significant work.

Dave