linux-kernel - Re: [PATCH 01/10] block: introduce BLK_FEAT_WRITE_ZEROES

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Message-ID: <20250613055630.GA9119@lst.de>
Date: Fri, 13 Jun 2025 07:56:30 +0200
From: Christoph Hellwig <hch@....de>
To: Zhang Yi <yi.zhang@...weicloud.com>
Cc: "Darrick J. Wong" <djwong@...nel.org>, Christoph Hellwig <hch@....de>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-block@...r.kernel.org, dm-devel@...ts.linux.dev,
	linux-nvme@...ts.infradead.org, linux-scsi@...r.kernel.org,
	linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	tytso@....edu, john.g.garry@...cle.com, bmarzins@...hat.com,
	chaitanyak@...dia.com, shinichiro.kawasaki@....com,
	brauner@...nel.org, martin.petersen@...cle.com, yi.zhang@...wei.com,
	chengzhihao1@...wei.com, yukuai3@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH 01/10] block: introduce BLK_FEAT_WRITE_ZEROES_UNMAP to
 queue limits features

On Fri, Jun 13, 2025 at 11:15:41AM +0800, Zhang Yi wrote:
> Yeah, this solution looks good to me. However, we currently have only
> two selections (none and unmap). What if we keep it as is and simply
> hide this interface if BLK_FEAT_WRITE_ZEROES_UNMAP is not set, making
> it visible only when the device supports this feature? Something like
> below:

I really hate having all kinds of different interfaces for configurations.
Maybe we should redo this similar to the other hardware/software interfaces
and have a hw_ limit that is exposed by the driver and re-only in
sysfs, and then the user configurable one without _hw.  Setting it to
zero disables the feature.