linux-kernel - Re: [RFC PATCH] ext4: Don't release mutex for DAX write

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Message-ID: <20160503084343.GA31363@infradead.org>
Date:	Tue, 3 May 2016 01:43:43 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Waiman Long <Waiman.Long@....com>
Cc:	Theodore Ts'o <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Scott J Norton <scott.norton@....com>,
	Douglas Hatch <doug.hatch@....com>
Subject: Re: [RFC PATCH] ext4: Don't release mutex for DAX write

As explained in another thread I really think we need to get DAX
to stop pretending to be direct I/O, which should also take care
of the locking.  The same issue also exists for ext2 and XFS so it
needs to be solved at a higher level.