linux-ext4 - Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes

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Message-ID: <20160910073012.GA5295@infradead.org>
Date:   Sat, 10 Sep 2016 00:30:12 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Matthew Wilcox <mawilcox@...rosoft.com>
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Theodore Ts'o <tytso@....edu>,
        Christoph Hellwig <hch@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-nvdimm@...1.01.org" <linux-nvdimm@...1.01.org>,
        Dave Chinner <david@...morbit.com>,
        "linux-mm@...ck.org" <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-fsdevel@...r.kernel.org>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v2 2/9] ext2: tell DAX the size of allocation holes

The mail is basically unparsable (hint: you can use a sane mailer even
with exchange servers :)).

Either way we need to get rid of buffer_heads, and another aop that
is entirely caller specific is unaceptable.  That being said your idea
doesn't sounds unreasonable, but will require a bit more work and has
no real short-term need.

So let's revisit the idea once you have patches to post and move forward
with the more urgent needs for now.
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