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

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Message-ID: <20250612044744.GA12828@lst.de>
Date: Thu, 12 Jun 2025 06:47:44 +0200
From: Christoph Hellwig <hch@....de>
To: Zhang Yi <yi.zhang@...weicloud.com>
Cc: 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, djwong@...nel.org,
	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 Wed, Jun 11, 2025 at 03:31:21PM +0800, Zhang Yi wrote:
> >> +/* supports unmap write zeroes command */
> >> +#define BLK_FEAT_WRITE_ZEROES_UNMAP	((__force blk_features_t)(1u << 17))
> > 
> > 
> > Should this be exposed through sysfs as a read-only value?
> 
> Uh, are you suggesting adding another sysfs interface to expose
> this feature?

That was the idea.  Or do we have another way to report this capability?