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Mon, 05 Oct 2026 04:43:17 -0700 (PDT) Message-ID: Date: Mon, 5 Oct 2026 12:43:14 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 05/13] block: add dma-buf support for raw bdev To: Christoph Hellwig Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org, Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= , Keith Busch , Sagi Grimberg , Alexander Viro , Christian Brauner , Jan Kara , Andrew Morton , Jens Axboe , Nitesh Shetty , Kanchan Joshi , Anuj Gupta , Tushar Gohad , William Power , Phil Cayton , Matthew Brost , Alasdair Kergon , Mike Snitzer , Mikulas Patocka , Benjamin Marzinski , dm-devel@lists.linux.dev References: <20261005091111.GB10727@lst.de> Content-Language: en-US From: Pavel Begunkov In-Reply-To: <20261005091111.GB10727@lst.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/5/26 10:11, Christoph Hellwig wrote: > On Mon, Sep 28, 2026 at 02:32:21PM +0100, Pavel Begunkov wrote: >> Add a simple proxy implementation of init_dma_buf_io_ctx() forwarding >> the call to a new struct block_device_operations operation. Also reject >> dma-buf backed iterators for buffered IO. >> >> Reviewed-by: Christoph Hellwig >> [pavel: reject dma-buf without O_DIRECT] >> Signed-off-by: Pavel Begunkov > > The Sashiko report about the errno on fallback here looks real, > and is probably easily fixed by setting a proper errno. I'm going to move the check into blkdev_buffered_write(), this should cover both paths. direct_write_fallback() will see -EOPNOTSUPP and fail appropriately. -- Pavel Begunkov