From: Christoph Hellwig <hch@lst.de>
To: Anuj Gupta <anuj1072538@gmail.com>
Cc: asml.silence@gmail.com, hch@lst.de, djwong@kernel.org,
cem@kernel.org, brauner@kernel.org, axboe@kernel.dk,
linux-block@vger.kernel.org, linux-xfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org, joshi.k@samsung.com,
anuj20.g@samsung.com, nj.shetty@samsung.com
Subject: Re: [RFC 2/4] block: refuse a dma-buf bio for a disk the buffer was not registered on
Date: Fri, 16 Oct 2026 11:24:41 +0200 [thread overview]
Message-ID: <20261016092441.GB23141@lst.de> (raw)
In-Reply-To: <20261016091919.971295-3-anuj1072538@gmail.com>
On Fri, Oct 16, 2026 at 02:49:12PM +0530, Anuj Gupta wrote:
> From: Nitesh Shetty <nj.shetty@samsung.com>
>
> A registered dma-buf map belongs to the device it was mapped for.
> The device backing a file can change after registration. Record
> the registered disk's dev_t at init and refuse a bio that targets
> a different one.
Can you explain a bit better what this is trying to solve?
next prev parent reply other threads:[~2026-10-16 9:24 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-16 9:19 [RFC 0/4] fs: support dma-buf backed direct I/O Anuj Gupta
2026-10-16 9:19 ` [RFC 1/4] block: factor out bdev_init_dma_buf_io_ctx() Anuj Gupta
2026-10-16 9:23 ` Christoph Hellwig
2026-10-16 9:19 ` [RFC 2/4] block: refuse a dma-buf bio for a disk the buffer was not registered on Anuj Gupta
2026-10-16 9:24 ` Christoph Hellwig [this message]
2026-10-16 9:19 ` [RFC 3/4] iomap: add dma-buf direct I/O guards and registration helper Anuj Gupta
2026-10-16 9:26 ` Christoph Hellwig
2026-10-16 9:19 ` [RFC 4/4] xfs: support dma-buf registered buffers for direct I/O Anuj Gupta
2026-10-16 9:28 ` Christoph Hellwig
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