Re: [PATCH v4 0/4] Implement dmabuf direct I/O via copy_file_range

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To: wangtao <tao.wangtao@xxxxxxxxx>
Subject: Re: [PATCH v4 0/4] Implement dmabuf direct I/O via copy_file_range
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 3 Jun 2025 06:00:45 -0700
Cc: sumit.semwal@xxxxxxxxxx, christian.koenig@xxxxxxx, kraxel@xxxxxxxxxx, vivek.kasireddy@xxxxxxxxx, viro@xxxxxxxxxxxxxxxxxx, brauner@xxxxxxxxxx, hughd@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, amir73il@xxxxxxxxx, benjamin.gaignard@xxxxxxxxxxxxx, Brian.Starkey@xxxxxxx, jstultz@xxxxxxxxxx, tjmercier@xxxxxxxxxx, jack@xxxxxxx, baolin.wang@xxxxxxxxxxxxxxxxx, linux-media@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linaro-mm-sig@xxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, bintian.wang@xxxxxxxxx, yipengxiang@xxxxxxxxx, liulu.liu@xxxxxxxxx, feng.han@xxxxxxxxx
In-reply-to: <20250603095245.17478-1-tao.wangtao@honor.com>

This is a really weird interface.  No one has yet to explain why dmabuf
is so special that we can't support direct I/O to it when we can support
it to otherwise exotic mappings like PCI P2P ones.

Follow-Ups:
- Re: [PATCH v4 0/4] Implement dmabuf direct I/O via copy_file_range
  - From: Christian König

References:
- [PATCH v4 0/4] Implement dmabuf direct I/O via copy_file_range
  - From: wangtao

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