linux-ext4 - Re: [PATCH 0/11] ext4: Convert ext4 DAX IO to iomap framework

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Date:   Wed, 2 Nov 2016 00:09:03 +0100
From:   Jan Kara <jack@...e.cz>
To:     Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:     Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        Ted Tso <tytso@....edu>, linux-nvdimm@...ts.01.org
Subject: Re: [PATCH 0/11] ext4: Convert ext4 DAX IO to iomap framework

On Tue 01-11-16 16:45:50, Ross Zwisler wrote:
> On Wed, Nov 02, 2016 at 09:12:35AM +1100, Dave Chinner wrote:
> > On Tue, Nov 01, 2016 at 10:06:10PM +0100, Jan Kara wrote:
> > > Hello,
> > > 
> > > this patch set converts ext4 DAX IO paths to the new iomap framework and
> > > removes the old bh-based DAX functions. As a result ext4 gains PMD page
> > > fault support, also some other minor bugs get fixed. The patch set is based
> > > on Ross' DAX PMD page fault support series [1]. It passes xfstests both in
> > > DAX and non-DAX mode.
> > > 
> > > The question is how shall we merge this. If Dave is pulling PMD patches through
> > > XFS tree, then these patches could go there as well (chances for conflicts
> > > with other ext4 stuff are relatively low) or Dave could just export a stable
> > > branch with PMD series which Ted would just pull...
> > 
> > I plan to grab Ross's PMD series in the next couple of days and I'll
> > push it out as a stable topic branch once I've sanity tested it.  I
> > don't really want to take a big chunk of ext4 stuff through the XFS
> > tree if it can be avoided....
> 
> Yea, we also need to figure out how to get Jan's "dax: Clear dirty bits after
> flushing caches" set merged, which is mostly MM stuff and I think will go
> through akpm's tree?  That set is also based on my PMD stuff.

Yeah, I've spoken to Andrew and he wants to take the MM changes through his
tree. I'll talk to him how to make this happen given the patches the series
depends on but the series still needs some review so "how to merge" is not
exactly a question of the day...

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR
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