linux-kernel - Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes

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Message-ID: <20160825192531.GA2607@linux.intel.com>
Date:   Thu, 25 Aug 2016 13:25:31 -0600
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        linux-kernel@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-nvdimm@...1.01.org, Matthew Wilcox <mawilcox@...rosoft.com>,
        Dave Chinner <david@...morbit.com>, linux-mm@...ck.org,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jan Kara <jack@...e.com>, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org
Subject: Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes

On Thu, Aug 25, 2016 at 12:57:28AM -0700, Christoph Hellwig wrote:
> Hi Ross,
> 
> can you take at my (fully working, but not fully cleaned up) version
> of the iomap based DAX code here:
> 
> http://git.infradead.org/users/hch/vfs.git/shortlog/refs/heads/iomap-dax
> 
> By using iomap we don't even have the size hole problem and totally
> get out of the reverse-engineer what buffer_heads are trying to tell
> us business.  It also gets rid of the other warts of the DAX path
> due to pretending to be like direct I/O, so this might be a better
> way forward also for ext2/4.

Sure, I'll take a look.