linux-ext4 - Re: BLKZEROOUT + pread should return zeroes, right?

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Message-ID: <yq14mv687sb.fsf@sermon.lab.mkp.net>
Date:	Tue, 14 Oct 2014 21:02:12 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	Zach Brown <zab@...bo.net>, Christoph Hellwig <hch@...radead.org>,
	"Darrick J. Wong" <darrick.wong@...cle.com>,
	Jens Axboe <axboe@...nel.dk>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	linux-fsdevel@...r.kernel.org, "Theodore Ts'o" <tytso@....edu>,
	linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: BLKZEROOUT + pread should return zeroes, right?

>>>>> "Dave" == Dave Chinner <david@...morbit.com> writes:

Dave> I don't care what happens to the block layer ioctls w.r.t. cache
Dave> coherency. If people want to make them fully cache coherent for
Dave> buffered IO, go right ahead.

Dave> But that doesn't change the fact that if you want your application
Dave> to work sanely on existing kernels, then using direct IO is the
Dave> only option...

Yep!

-- 
Martin K. Petersen	Oracle Linux Engineering
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