Re: [PATCH] virtio_pmem: do flush synchronously

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To: Hou Tao <houtao@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH] virtio_pmem: do flush synchronously
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 21 Jun 2023 05:13:20 -0700
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx, nvdimm@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, houtao1@xxxxxxxxxx
In-reply-to: <20230620032838.1598793-1-houtao@huaweicloud.com>
References: <20230620032838.1598793-1-houtao@huaweicloud.com>

I think the proper minimal fix is to pass in a REQ_WRITE in addition to
REQ_PREFLUSH.  We can than have a discussion on the merits of this
weird async pmem flush scheme separately.

Follow-Ups:
- [PATCH v2] virtio_pmem: add the missing REQ_OP_WRITE for flush bio
  - From: Hou Tao

References:
- [PATCH] virtio_pmem: do flush synchronously
  - From: Hou Tao

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