linux-kernel - Re: [PATCH v4 2/2] block: Convert integrity to bvec_alloc

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Message-ID: <yq1ip9zbyjq.fsf@sermon.lab.mkp.net>
Date:	Wed, 24 Oct 2012 12:54:49 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Kent Overstreet <koverstreet@...gle.com>
Cc:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, tj@...nel.org, axboe@...nel.dk,
	vgoyal@...hat.com, martin.petersen@...cle.com
Subject: Re: [PATCH v4 2/2] block: Convert integrity to bvec_alloc_bs()

>>>>> "Kent" == Kent Overstreet <koverstreet@...gle.com> writes:

Kent> Also, bio_integrity_alloc() was using fs_bio_set if no bio_set was
Kent> specified. This was wrong

You did that, I didn't.

Kent> - using the bio_set doesn't protect us from memory allocation
Kent>   failures, because we just used kmalloc for the
Kent>   bio_integrity_payload.

I don't understand this comment. kmalloc where?

The bip includes an embedded bvec array and comes from either one of the
dedicated slabs or - in the case of the max bvec size - from a
mempool. These slabs and the mempool are per bio_set.

-- 
Martin K. Petersen	Oracle Linux Engineering
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