linux-kernel - Re: [PATCH v11 2/9] block: Add copy offload support infrastructure

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Message-ID: <ZHTm/v1jTZhcpDei@casper.infradead.org>
Date:   Mon, 29 May 2023 18:55:10 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Nitesh Shetty <nj.shetty@...sung.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Alasdair Kergon <agk@...hat.com>,
        Mike Snitzer <snitzer@...nel.org>, dm-devel@...hat.com,
        Keith Busch <kbusch@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        James Smart <james.smart@...adcom.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        James.Bottomley@...senpartnership.com, bvanassche@....org,
        hare@...e.de, ming.lei@...hat.com, dlemoal@...nel.org,
        anuj20.g@...sung.com, joshi.k@...sung.com, nitheshshetty@...il.com,
        gost.dev@...sung.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v11 2/9] block: Add copy offload support infrastructure

On Mon, May 22, 2023 at 04:11:33PM +0530, Nitesh Shetty wrote:
> +		token = alloc_page(gfp_mask);

Why is PAGE_SIZE the right size for 'token'?  That seems quite unlikely.
I could understand it being SECTOR_SIZE or something that's dependent on
the device, but I cannot fathom it being dependent on the host' page size.