linux-ext4 - Re: [RFC 00/11] DAX fsynx/msync support

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Message-ID: <x49a8qtpq99.fsf@segfault.boston.devel.redhat.com>
Date:	Wed, 04 Nov 2015 13:34:58 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-nvdimm@...1.01.org, "J. Bruce Fields" <bfields@...ldses.org>,
	linux-mm@...ck.org, Andreas Dilger <adilger.kernel@...ger.ca>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jeff Layton <jlayton@...chiereds.net>, x86@...nel.org,
	Ingo Molnar <mingo@...hat.com>, linux-ext4@...r.kernel.org,
	xfs@....sgi.com, Alexander Viro <viro@...iv.linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>, axboe@...nel.dk,
	"Theodore Ts'o" <tytso@....edu>, linux-kernel@...r.kernel.org,
	Jan Kara <jack@...e.com>, linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>
Subject: Re: [RFC 00/11] DAX fsynx/msync support

Jeff Moyer <jmoyer@...hat.com> writes:

>> Hence once the filesystem has waited on the REQ_WRITE|REQ_FLUSH IO
>> to complete, we know that all the earlier REQ_WRITE IOs are on
>> stable storage, too. Hence there's no need for the elevator to drain
>> the queue to guarantee completion ordering - the dispatch ordering
>> and flush/fua write semantics guarantee that when the flush/fua
>> completes, all the IOs dispatch prior to that flush/fua write are
>> also on stable storage...
>
> Des xfs rely on this model for correctness?  If so, I'd say we've got a
> problem.

Dave?
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