linux-kernel - Re: [PATCHSET block#for-2.6.36-post] block: replace barrier with sequenced flush

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Date:	Wed, 25 Aug 2010 00:14:21 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Vladislav Bolkhovitin <vst@...b.net>
Cc:	Tejun Heo <tj@...nel.org>, Kiyoshi Ueda <k-ueda@...jp.nec.com>,
	Christoph Hellwig <hch@....de>, jaxboe@...ionio.com,
	linux-fsdevel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-raid@...r.kernel.org, James.Bottomley@...e.de, tytso@....edu,
	chris.mason@...cle.com, swhiteho@...hat.com,
	konishi.ryusuke@....ntt.co.jp, dm-devel@...hat.com, jack@...e.cz,
	rwheeler@...hat.com, hare@...e.de
Subject: Re: [PATCHSET block#for-2.6.36-post] block: replace barrier with
 sequenced flush

> In SCSI there are conditions when a command, including FLUSH 
> (SYNC_CACHE), failed which don't imply lost data. For them the caller 
> expected to retry the failed command. Most common cases are Unit 
> Attentions and TASK QUEUE FULL status.

ATA expects the command to be retried as well because a failed flush
indicates the specific sector is lost (unless the host still has a copy
of course - which is *very* likely although we don't use it) but the rest
of the flush transaction can be retried to continue to flush sectors
beyond the failed one.

Alan
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