linux-kernel - Re: [RFC v2 0/5] md/raid1: introduce a new sync action to repair badblocks

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Message-ID: <f4aec8a0-0798-4afc-a85a-3fe8afd3433c@huaweicloud.com>
Date: Wed, 4 Feb 2026 17:29:29 +0800
From: Zheng Qixing <zhengqixing@...weicloud.com>
To: Christoph Hellwig <hch@...radead.org>
Cc: song@...nel.org, yukuai@...as.com, linan122@...wei.com, xni@...hat.com,
 linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
 yi.zhang@...wei.com, yangerkun@...wei.com, houtao1@...wei.com,
 Zheng Qixing <zhengqixing@...wei.com>
Subject: Re: [RFC v2 0/5] md/raid1: introduce a new sync action to repair
 badblocks

在 2026/2/4 0:31, Christoph Hellwig 写道:

> On Tue, Feb 03, 2026 at 04:08:23PM +0800, Zheng Qixing wrote:
>> Hi,
>>
>> 在 2026/2/3 15:31, Christoph Hellwig 写道:
>>> Just curious, but what kind of devices do you see that have
>>> permanent bad blocks at a fixed location that are not fixed by
>>> rewriting the sector?
>> The bad_blocks entries record sectors where I/O failed, which
>> indicates that the device-internal remapping did not succeed
>> at that time.
>>
>> `rectify` does not assume a permanently bad or fixed LBA. Its
>> purpose is to trigger an additional rewrite, giving the underlying
>> device (e.g. FTL or firmware) another opportunity to perform its
>> own remapping.
> Well, what devices do you see where writes fail, but rewrites
> fix them?

I understand your concerns, but I do not have a concrete example tied to a specific device model... The intent here is to provide an additional rewrite opportunity, which allows the write path to be exercised again and gives the underlying device or stack a chance to recover or remap the affected range. For remote storage devices, I/O may fail due to network or transport issues. If the final attempt fails, MD can record the affected range in bad_blocks. This behavior does not appear to be tied to a specific device model. For local storage, some controllers may have limitations or corner cases in their remapping mechanisms. In such cases, a sector that could potentially be recovered may be marked as bad, leaving no opportunity for a subsequent successful rewrite.