linux-kernel - Re: [RFC v2 05/11] block: add infra to handle dmabuf tokens

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Message-ID: <aTGHvbj2wfs33jRp@infradead.org>
Date: Thu, 4 Dec 2025 05:08:13 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Pavel Begunkov <asml.silence@...il.com>
Cc: linux-block@...r.kernel.org, io-uring@...r.kernel.org,
	Vishal Verma <vishal1.verma@...el.com>, tushar.gohad@...el.com,
	Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...nel.dk>,
	Sagi Grimberg <sagi@...mberg.me>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
	linux-fsdevel@...r.kernel.org, linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org
Subject: Re: [RFC v2 05/11] block: add infra to handle dmabuf tokens

On Sun, Nov 23, 2025 at 10:51:25PM +0000, Pavel Begunkov wrote:
> +struct dma_token *blkdev_dma_map(struct file *file,
> +				 struct dma_token_params *params)

Given that this is a direct file operation instance it should be
in block/fops.c.  If we do want a generic helper below it, it
should take a struct block_device instead.  But we can probably
defer that until a user for that shows up.