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

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Date:   Tue, 21 Nov 2017 09:23:47 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Dave Chinner <david@...morbit.com>
Cc:     "Darrick J. Wong" <darrick.wong@...cle.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 09:27:49AM +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?