linux-kernel - Re: [PATCH v3 1/2] ext4: Pass in DIO_SKIP_DIO_COUNT flag if inode_dio

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Message-ID: <20160420205801.GA24609@infradead.org>
Date:	Wed, 20 Apr 2016 13:58:01 -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,
	Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
	Scott J Norton <scott.norton@....com>,
	Douglas Hatch <doug.hatch@....com>,
	Toshimitsu Kani <toshi.kani@....com>
Subject: Re: [PATCH v3 1/2] ext4: Pass in DIO_SKIP_DIO_COUNT flag if
 inode_dio_begin() called

FYI, none of the Dax code even needs to ever touch the dio_count,
as dax I/O can't be asynchronous, and we thus don't need it to protect
against truncate.  I'd suggest to remove it and then end_io callback
from the DAX code entirely as a start and then move from there.