linux-kernel - Re: [PATCH 00/14] target: Initial support for DIF Type1+Type3 emulation

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Date:	Wed, 15 Jan 2014 20:42:11 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
Cc:	sagi grimberg <sagig@...lanox.com>,
	"Nicholas A. Bellinger" <nab@...erainc.com>,
	target-devel <target-devel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	Or Gerlitz <ogerlitz@...lanox.com>
Subject: Re: [PATCH 00/14] target: Initial support for DIF Type1+Type3 emulation

>>>>> "nab" == Nicholas A Bellinger <nab@...ux-iscsi.org> writes:

nab> The issue is that existing fs/bio-integrity.c code always assumes
nab> client/initiator mode, in that it will attempt to
nab> bio_integrity_generate() protection information in the submit_bio
nab> WRITE path, and bio_integrity_verify() of protection information in
nab> the bio_endio READ completion path.

Only if the submit_bio() caller hasn't attached protection information
already. If you submit a bio with a bip already attached the block layer
will not generate/verify.

-- 
Martin K. Petersen	Oracle Linux Engineering
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