[PATCH] Add man page for vfs_syncops

[Ira Cooper]

On Sat, Aug 10, 2013 at 8:38 AM, Volker Lendecke
<Volker.Lendecke at sernet.de>wrote:

> On Fri, Aug 09, 2013 at 02:12:46AM -0700, Christoph Hellwig wrote:
> > On Fri, Aug 09, 2013 at 11:08:03AM +0200, Karolin Seeger wrote:
> > > +   Some filesystems (even some journaled filesystems) require that a
> > > +   fsync() be performed on many meta data operations to ensure that
> the
> > > +   operation is guaranteed to remain in the filesystem after a power
> > > +   failure. This is particularly important for some cluster
> filesystems
> > > +   which are participating in a node failover system with clustered
> > > +   Samba. On those filesystems the <command>vfs_syncops</command> VFS
> module
> > > +   provides a way to perform those operations safely.
> >
> > I don't know a single Unix filesystems from the last 40 years where this
> > is not true.  Why isn't this the default behaviour in Samba instead of
> > having it in a module that very few people are going to use?
>
> Performance. fsync is very expensive in many situations.
>
>
Volker,

Do you know the semantics guaranteed here?

-Ira