linux-kernel - Re: [PATCH v4 13/19] selftests: ublk: add utility to get block device metadata size

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Message-ID: <aV-hPqT3B4rHV2s8@fedora>
Date: Thu, 8 Jan 2026 20:21:18 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Caleb Sander Mateos <csander@...estorage.com>
Cc: Jens Axboe <axboe@...nel.dk>, Shuah Khan <shuah@...nel.org>,
	linux-block@...r.kernel.org, linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Stanley Zhang <stazhang@...estorage.com>,
	Uday Shankar <ushankar@...estorage.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>
Subject: Re: [PATCH v4 13/19] selftests: ublk: add utility to get block
 device metadata size

On Thu, Jan 08, 2026 at 02:19:41AM -0700, Caleb Sander Mateos wrote:
> Some block device integrity parameters are available in sysfs, but
> others are only accessible using the FS_IOC_GETLBMD_CAP ioctl. Add a
> metadata_size utility program to print out the logical block metadata
> size, PI offset, and PI size within the metadata. Example output:
> $ metadata_size /dev/ublkb0
> metadata_size: 64
> pi_offset: 56
> pi_tuple_size: 8
> 
> Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>

Reviewed-by: Ming Lei <ming.lei@...hat.com>

Thanks
Ming