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

[Zhang Yi <yi.zhang@huaweicloud.com>]

From: Zhang Yi <yi.zhang@huawei.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