linux-kernel - Re: [RFC PATCH] bio-integrity: add "bip_max_vcnt" into struct bio_integrity

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Message-ID: <yq1fvin9uje.fsf@sermon.lab.mkp.net>
Date:	Sun, 29 Jun 2014 19:15:49 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Gu Zheng <guz.fnst@...fujitsu.com>
Cc:	Jens <axboe@...nel.dk>, <martin.petersen@...cle.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Kent <kmo@...erainc.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH] bio-integrity: add "bip_max_vcnt" into struct bio_integrity_payload

>>>>> "Gu" == Gu Zheng <guz.fnst@...fujitsu.com> writes:

[Sorry about the delay. I'm on vacation right now.]

Gu> But it seems that bip_integrity_vecs() will return the wrong number
Gu> if the bio is not based on any bio_set for some reason(bio->bi_pool
Gu> == NULL), because in that case, the bip_inline_vecs[0] is malloced
Gu> directly.  So here we add the bip_max_vcnt to record the count of
Gu> vector slots, and cleanup the function bip_integrity_vecs().

I'm in agreement with your fix.

However, I'm still not sure what the use case is for bios without an
associated bioset. I do not see any callers that pass in a NULL bioset.

-- 
Martin K. Petersen	Oracle Linux Engineering
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