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

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Message-ID: <20250611060900.GA4613@lst.de>
Date: Wed, 11 Jun 2025 08:09:00 +0200
From: Christoph Hellwig <hch@....de>
To: Zhang Yi <yi.zhang@...weicloud.com>
Cc: 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, hch@....de,
	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 04, 2025 at 10:08:41AM +0800, Zhang Yi wrote:
> +static ssize_t queue_write_zeroes_unmap_show(struct gendisk *disk, char *page)

..

> +static int queue_write_zeroes_unmap_store(struct gendisk *disk,
> +		const char *page, size_t count, struct queue_limits *lim)

We're probably getting close to wanting macros for the sysfs
flags, similar to the one for the features (QUEUE_SYSFS_FEATURE).

No need to do this now, just thinking along.

> +/* 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?

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@....de>