linux-ext4 - Re: [PATCH v2] iomap: report collisions between directio and buffered writes to userspace

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Message-ID: <20171121185346.GC2135@magnolia>
Date:   Tue, 21 Nov 2017 10:53:46 -0800
From:   "Darrick J. Wong" <darrick.wong@...cle.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Dave Chinner <david@...morbit.com>,
        xfs <linux-xfs@...r.kernel.org>,
        Ilya Dryomov <idryomov@...il.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Brian Foster <bfoster@...hat.com>,
        holger@...lied-asynchrony.com,
        linux-ext4 <linux-ext4@...r.kernel.org>,
        linux-btrfs <linux-btrfs@...r.kernel.org>
Subject: Re: [PATCH v2] iomap: report collisions between directio and
 buffered writes to userspace

On Tue, Nov 21, 2017 at 09:23:47AM -0800, Matthew Wilcox wrote:
> On Tue, Nov 21, 2017 at 09:27:49AM +1100, Dave Chinner wrote:
> > On Mon, Nov 20, 2017 at 01:51:00PM -0800, Matthew Wilcox wrote:
> > > If you want an example of it in use, I'm pretty happy with this patch
> > > that switches the brd driver entirely from the radix tree API to the
> > > xarray API:
> > > 
> > > http://git.infradead.org/users/willy/linux-dax.git/commitdiff/dbf96ae943e43563cbbaa26e21b656b6fe8f4b0f
> > 
> > Looks pretty neat, but I'll reserve judgement for when I see the
> > conversion of the XFS radix tree code....
> 
> Challenge accepted.  This was a good thing for me to do because I found
> some opportunities to improve the XArray API.
> 
> Changes since yesterday:
> 
>  - Added XA_NO_TAG
>  - Added 'max' parameters to xa_get_entries() and xa_get_tagged()
>  - Changed the order of the arguments of xa_get_entries() and xa_get_tagged()
>    to match the radix tree equivalents
> 
> You can see the patches on that (rebased) branch:
> 
> xfs: Convert mru cache to XArray
> xfs: Convert xfs dquot to XArray
> xfs: Convert pag_ici_root to XArray
> xfs: Convert m_perag_tree to XArray
> 
> or did you want me to send them by email?

Yes please.

--D

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