[Ocfs2-tools-devel] question of ocfs2_controld (Jun 27)

[Joel Becker]

On Sat, Jun 27, 2009 at 03:00:05AM +0800, Coly Li wrote:
> When reading code of mount.ocfs2 to check a lvb lenght issue, I find code in
> mkfs.ocfs2.c:
> 351         if (!(mo.flags & MS_REMOUNT) && !dev_ro && clustered) {
> 352                 ret = o2cb_begin_group_join(&cluster, &desc);
> 353                 if (ret) {
> 354                         block_signals (SIG_UNBLOCK);
> 355                         com_err(progname, ret,
> 356                                 "while trying to join the group");
> 357                         goto bail;
> 358                 }
> 359                 hb_started = 1;
> 360         }
> on L352, o2cb_begin_group_join() gets called, it sends a CM_MOUNT message to
> ocfs2_controld.
> 
> In ocfs2_controld, I don't see anywhere calls mount(2). Therefore, I guess in
> ocfs2_controld, CM_MOUNT just does some membership and service stuffs, does not
> call mount(2). Am I right ?

	Right.  It's an intention to mount.  The cluster code does the
cluster stuff and responds with an OK.  Then mount.ocfs2 does the
mount(2) call.

> My original purpose is to find where to initiate a lvb with 64bytes, but from
> mount.ocfs2 code, I don't find anywhere to create a dlm lockspace (before create
> a lock) so far.

	I'm not sure why you need an LVB in mount.ocfs2, let alone a dlm
lockspace.

Joel

-- 

 Joel's First Law:

	Nature abhors a GUI.

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker at oracle.com
Phone: (650) 506-8127