linux-kernel - Re: [PATCH 14/15] libnvdimm: support read-only btt backing devices

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Message-ID: <20150623101049.GF24894@lst.de>
Date:	Tue, 23 Jun 2015 12:10:49 +0200
From:	Christoph Hellwig <hch@....de>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Christoph Hellwig <hch@....de>,
	Dan Williams <dan.j.williams@...el.com>,
	Jens Axboe <axboe@...nel.dk>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...1.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 14/15] libnvdimm: support read-only btt backing devices

On Mon, Jun 22, 2015 at 02:48:48PM -0400, Jeff Moyer wrote:
> OK, so you think applications using buffered I/O will Just Work(TM)?  My
> guess is that things will start to break that hadn't broken in the
> past.  Sure, the application isn't designed properly, and that should be
> fixed, but we shouldn't foist this on users as the default.

They will work or break the same way as before.  We have all kinds of
cases of non-sector updates for buffered I/O anyway: inlіne data, tail
merging, etc.
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