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

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Message-ID: <yq18rewbmay.fsf@ca-mkp.ca.oracle.com>
Date:   Wed, 12 Apr 2023 21:34:00 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     hch@....de
Cc:     Jinyoung CHOI <j-young.choi@...sung.com>,
        "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>,
        "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


>> 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.

Yep, that seems like a better approach. We should try to merge.

-- 
Martin K. Petersen	Oracle Linux Engineering