linux-kernel - Re: [PATCH v6 12/15] xfs: require mmap lock for xfs_break

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Message-ID: <20180319211401.GA5291@lst.de>
Date:   Mon, 19 Mar 2018 22:14:01 +0100
From:   Christoph Hellwig <hch@....de>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Christoph Hellwig <hch@....de>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Dave Chinner <david@...morbit.com>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Jan Kara <jack@...e.cz>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 12/15] xfs: require mmap lock for xfs_break_layouts()

On Mon, Mar 19, 2018 at 01:10:52PM -0700, Dan Williams wrote:
> On Mon, Mar 19, 2018 at 12:45 PM, Christoph Hellwig <hch@....de> wrote:
> > On Mon, Mar 19, 2018 at 10:57:55AM -0700, Dan Williams wrote:
> >> I don't see anything to adapt with respect to mmap locks since reflink
> >> and dax are mutually exclusive.
> >
> > For now.  I'll change that pretty soon.
> 
> Right, so which patch set will be staged first? This one or the one
> that causes us to consider reflink vs dax locking?

Given that I haven't even posted the reflink+DAX support (not fixed
all issues with it) I'm pretty sure you'll be faster :)