linux-kernel - Re: [PATCH 2/2] nvme-pci: fix metadata mapping length

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Message-ID: <20230412065736.GB20550@lst.de>
Date:   Wed, 12 Apr 2023 08:57:36 +0200
From:   "hch@....de" <hch@....de>
To:     Jinyoung CHOI <j-young.choi@...sung.com>
Cc:     "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>, "hch@....de" <hch@....de>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "chaitanya.kulkarni@....com" <chaitanya.kulkarni@....com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        martin.petersen@...cle.com
Subject: Re: [PATCH 2/2] nvme-pci: fix metadata mapping length

On Wed, Apr 12, 2023 at 02:24:43PM +0900, Jinyoung CHOI wrote:
> Even if the memory allocated for integrity is physically continuous,
> struct bio_vec is composed separately for each page size.
> In order not to use the blk_rq_map_integrity_sg(), the length of the
> DMA mapping should be the total size of integrity payload.

Hmm, looking outside the bio_vec is pretty nasty.

I think the problem here is that bio_integrity_add_page should
just add to the existing bvec, similar to bio_add_page and friends.