[RFC] Use mutexes by default in db_open()

[Amitay Isaacs]

On Wed, May 31, 2017 at 3:29 PM, Ralph Böhme <slow at samba.org> wrote:

> Hi Amitay
>
> On Mon, May 29, 2017 at 12:21:50PM +1000, Amitay Isaacs wrote:
> > Here's the summary of what I would like to propose:
> >  1. CTDB ignores tdb_flags specified in DB_ATTACH controls, tdb flags are
> > calculated based on the database model (or specific DB_ATTACH control)
> >  2. For volatile databases, mutexes will be enabled by default
> > (TDBMutexEnabled=1) when samba enables mutexes by default
> > (dbwrap_tdb_mutexes:*=true)
>
> sorry, but I fail to understand how 1 and 2 could work together. If,
> according
> to 1, ctdb ignores the tdb_flags in the DB_ATTACH control, how is
> disabling of
> mutexes handled in step 2 when dbwrap_tdb_mutexes:*=false is set in
> smb.conf
> (while TDBMutexEnabled=1 still set for ctdb) ?
>
> *scratches head*
>
>
> Obviously you have not ready my fully.  Here's the statement you missed
from previous email.

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As a result, in clustered samba case, dbwrap_tdb_mutexes settings will be
ignored for clustered (volatile) databases.
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Amitay.