linux-kernel - [PATCH blktests v2 0/3] blktest: add unmap write zeroes tests

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Message-Id: <20250813024421.2507446-1-yi.zhang@huaweicloud.com>
Date: Wed, 13 Aug 2025 10:44:18 +0800
From: Zhang Yi <yi.zhang@...weicloud.com>
To: linux-fsdevel@...r.kernel.org,
	linux-block@...r.kernel.org,
	dm-devel@...ts.linux.dev,
	linux-nvme@...ts.infradead.org,
	linux-scsi@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	hch@....de,
	tytso@....edu,
	djwong@...nel.org,
	bmarzins@...hat.com,
	chaitanyak@...dia.com,
	shinichiro.kawasaki@....com,
	brauner@...nel.org,
	martin.petersen@...cle.com,
	yi.zhang@...wei.com,
	yi.zhang@...weicloud.com,
	chengzhihao1@...wei.com,
	yukuai3@...wei.com,
	yangerkun@...wei.com
Subject: [PATCH blktests v2 0/3] blktest: add unmap write zeroes tests

From: Zhang Yi <yi.zhang@...wei.com>

Change since v2:
 - Modify the sysfs interfaces according to the kernel implementation.
 - Determine whether the kernel supports it by directly checking the
   existence of the sysfs interface, instead of using device_requries(). 
 - Drop _short_dev() helper and directly use _real_dev() to acquire dm
   path.
 - Check the return value of setup_test_device().
 - Fix the '"make check'" errors.


The Linux kernel (since version 6.17)[1] supports FALLOC_FL_WRITE_ZEROES
in fallocate(2) and add max_{hw|user}_wzeroes_unmap_sectors parameters
to the block device queue limit. These tests test those block device
unmap write zeroes sysfs interface

        /sys/block/<disk>/queue/write_zeroes_max_bytes
        /sys/block/<disk>/queue/write_zeroes_unmap_max_hw_bytes

with various SCSI/NVMe/device-mapper devices.

The value of /sys/block//queue/write_zeroes_unmap_max_hw_bytes should be
equal to a nonzero value of /sys/block//queue/write_zeroes_max_bytes if
the block device supports the unmap write zeroes command; otherwise, it
should return 0. We can also disable unmap write zeroes command by
setting /sys/block/<disk>/queue/write_zeroes_max_bytes to 0.

 - scsi/010 test SCSI devices.
 - dm/003 test device mapper stacked devices.
 - nvme/065 test NVMe devices.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=278c7d9b5e0c

Thanks,
Yi.

Zhang Yi (3):
  scsi/010: add unmap write zeroes tests
  dm/003: add unmap write zeroes tests
  nvme/065: add unmap write zeroes tests

 common/rc          | 10 +++++
 tests/dm/003       | 86 +++++++++++++++++++++++++++++++++++++++++
 tests/dm/003.out   |  2 +
 tests/nvme/065     | 96 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/nvme/065.out |  4 ++
 tests/scsi/010     | 84 ++++++++++++++++++++++++++++++++++++++++
 tests/scsi/010.out |  2 +
 7 files changed, 284 insertions(+)
 create mode 100755 tests/dm/003
 create mode 100644 tests/dm/003.out
 create mode 100755 tests/nvme/065
 create mode 100644 tests/nvme/065.out
 create mode 100755 tests/scsi/010
 create mode 100644 tests/scsi/010.out

-- 
2.39.2