[PATCH] Add missing async fsync_send()/recv() code to ceph VFS.

[Jeremy Allison]

On Tue, May 01, 2018 at 12:08:18PM -0700, Jeremy Allison wrote:
> On Mon, Apr 30, 2018 at 02:46:25PM -0700, Jeremy Allison via samba-technical wrote:
> > On Mon, Apr 30, 2018 at 07:03:01PM +0200, Ralph Böhme wrote:
> > > On Mon, Apr 30, 2018 at 09:30:41AM -0700, Jeremy Allison wrote:
> > > > On Mon, Apr 30, 2018 at 11:29:16AM +0200, Ralph Böhme wrote:
> > > > > 
> > > > > vfs_ceph doesn't implement profiling so it doesn't really matter, cf the
> > > > > SMBPROFILE_BYTES_ASYNC_* macros in vfs_default how it would look like.
> > > > > 
> > > > > So I guess you can either remove the PROFILE_TIMESTAMP macro invocations or
> > > > > implement the profiling stuff.
> > > > 
> > > > OK, here is version #2, including the changes you guys discussed.
> > > > 
> > > > Please review and push if happy. I have a follow-up patch that
> > > > removes all uses of the synchronous fsync_fn() from the VFS once
> > > > this one goes in :-).
> > > 
> > > pushed.
> > 
> > Hurrah - it went in, thanks ! Now I have your attention,
> > here is the follow-up that removes the synchronous fsync_fn()
> > completely from the VFS.
> > 
> > Please review and let me know what you think !
> > 
> > FYI: I'm half way though doing the same for SMB_VFS_READ
> > (converting that to SMB_VFS_PREAD everywhere and then
> > moving SMB_VFS_PREAD -> SMB_VFS_PREAD_SEND/SMB_VFS_PREAD_RECV
> > pairs). Finally I'll get to SMB_VFS_WRITE and do the same,
> > and we should end up with only *one* way to do a VFS
> > FSYNC/READ/WRITE in the backend - and that will be asynchronous,
> > instead of the current two or three different ways, some
> > sync, some async.
> 
> FYI Ralph, I know you're busy - but I've now got working
> code that builds on top of this patch that eliminates
> all uses of SMB_VFS_READ ! SMB_VFS_WRITE next, then
> convert all users of SMB_VFS_PREAD/SMB_VFS_PWRITE to
> the async versions, then we have the holy grail of
> all read/write I/O being done async as the only method
> available !

Once the fsync changes have gone in I'll start
sending this through in smaller digestible
chunks. The only larger changes are (would you
belive it :-) in source3/printing/nt_printing.c
which is an old, heavy user of the LSEEK/READ
style interface.

Jeremy.