Re: [RFC][PATCH v2 0/5] Experiments with overlayfs filemap

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On Tue, Jan 29, 2019 at 10:58 AM Miklos Szeredi <miklos@xxxxxxxxxx> wrote:
>
> On Tue, Jan 29, 2019 at 9:54 AM Amir Goldstein <amir73il@xxxxxxxxx> wrote:
> >
> > On Tue, Jan 29, 2019 at 9:17 AM Miklos Szeredi <miklos@xxxxxxxxxx> wrote:
> > >
> > > On Mon, Jan 28, 2019 at 11:14 PM Amir Goldstein <amir73il@xxxxxxxxx> wrote:
> > > >
> > > > On Mon, Jan 28, 2019 at 11:22 PM Miklos Szeredi <miklos@xxxxxxxxxx> wrote:
> > > > >
> > > > > On Mon, Jan 28, 2019 at 10:17 PM Miklos Szeredi <miklos@xxxxxxxxxx> wrote:
> > > > >
> > > > > > Trying to put some code together...
> > > > >
> > > > > Very rudimentary patch attached.  It doens't do direct IO yet, but
> > > > > demonstrates what I meant about achoring the upper file in the inode.
> > > > >
> > > >
> > > > Code looks good, but blows up on xfstests, so I'll wait for a baked patch
> > > > before testing.
> > > >
> > > > > Also found the trick to actually make writeback work:
> > > > > super_setup_bdi() call in fill_super...
> > > > >
> > > >
> > > > Cool, but when adding only setup_bdi() this to my code, I still don't see any
> > > > writeback. No writeback observed with your patch as well.
> > >
> > > I did observe writeback, but haven't done much testing.  Will
> > > hopefully get this into a better shape today.
> > >
> >
> > OK, I see the writebacks. Didn't see them with test:
> >
> > # ./run --ov --samefs --recycle rename-new-pop-dir
>
> Which branch is this?  Master doesn't have --recycle.
>

Sorry, this flag is from branch ovl_snapshot, but exact same
functionality on master with syntax:

./run --ov=0 --samefs rename-new-pop-dir

Thanks,
Amir.



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