linux-kernel - Re: [PATCH 16/23] md/md-llbitmap: implement bit state machine

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Message-ID: <ede16ca4-96ef-e8e6-45fd-1c88cddc7f4a@huaweicloud.com>
Date: Tue, 1 Jul 2025 10:02:59 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Xiao Ni <xni@...hat.com>, Yu Kuai <yukuai1@...weicloud.com>
Cc: hch@....de, colyli@...nel.org, song@...nel.org,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-raid@...r.kernel.org, yi.zhang@...wei.com, yangerkun@...wei.com,
 johnny.chenyi@...wei.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH 16/23] md/md-llbitmap: implement bit state machine

Hi,

在 2025/07/01 9:55, Xiao Ni 写道:
> If there is a filesystem and the write io returns. The discard must
> see the memory changes without any memory barrier apis?

It's the filesystem itself should manage free blocks, and gurantee
discard can only be issued to free blocks that is not used at all.

Thanks,
Kuai