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

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Message-ID: <20160825075728.GA11235@infradead.org>
Date:   Thu, 25 Aug 2016 00:57:28 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:     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

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.