linux-kernel - Re: [PATCH 1/2] dma-buf: heaps: DMA_HEAP_IOCTL_ALLOC_READ

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Message-ID: <ZpiHKY2pGiBuEq4z@infradead.org>
Date: Wed, 17 Jul 2024 20:08:25 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Huan Yang <link@...o.com>
Cc: Christoph Hellwig <hch@...radead.org>,
	Christian König <christian.koenig@....com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Benjamin Gaignard <benjamin.gaignard@...labora.com>,
	Brian Starkey <Brian.Starkey@....com>,
	John Stultz <jstultz@...gle.com>,
	"T.J. Mercier" <tjmercier@...gle.com>, linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
	linux-kernel@...r.kernel.org, opensource.kernel@...o.com
Subject: Re: [PATCH 1/2] dma-buf: heaps: DMA_HEAP_IOCTL_ALLOC_READ_FILE
 framework

On Thu, Jul 18, 2024 at 09:51:39AM +0800, Huan Yang wrote:
> Yes, actually, if dma-buf want's to copy_file_range from a file, it need
> change something in vfs_copy_file_range:

No, it doesn't.  copy_file_range is specifically designed to copy inside
a single file system as already mentioned.  The generic offload for
copying between arbitrary FDs is splice and the sendfile convenience
wrapper around it