[LTP] [PATCH v6, 0/4] cgroup/cgroup_regression_test: Fix umount failure

[Leo Liang]

Hi,

A gentel ping.
If there's any modification needs to be made, please let me know.
Thanks!

Best regards,
Leo

On Wed, Aug 04, 2021 at 09:51:07AM +0800, Leo Liang wrote:
> The test sequence
> 	mount -t cgroup -o <controllers> <path>
> 	mkdir <path>/<dir>
> 	rmdir <path>/<dir>
> 	umount <path>
> 	mount -t cgroup -o <controllers> <path>
> would easily fail at the last mount with -EBUSY on certain platform.
> 
> Adding a little delay between "rmdir" and "umount" could fix the problem,
> so use tst_umount API instead of umount in "rmdir, umount" sequence.
> 
> tst_umount API is ambiguous when checking for whether a device is mounted.
> Modify it to check an actual mount point instead of device
> and reject anything that does not start with '/' as an argument.
> 
> Changes since v1
> - Use "tst_umount" instead of "sync" as suggested
> - Make "tst_umount" work with argument that has terminating slash
> 
> Changes since v2
> - Filter out the trailing slash instead of using mountpoint command
> 
> Changes since v3
> - Filter out the trailing slash only in grep command
> - Add comment in the test script
> 
> Changes since v4
> - Remove unnecessary stderr redirection
> 
> Changes since v5
> - Make tst_umount to only accept absolute mount point as an argument
> - Modify tests that use tst_umount to pass mount point in instead of device
> 
> Leo Yu-Chi Liang (4):
>   lib: tst_umount: umount a mount point instead of device
>   doc: change the default behavior of tst_umount
>   cgroup/cgroup_regression_test: Fix umount failure
>   Make argument to tst_umount an absolute path
> 
>  doc/shell-test-api.txt                         |  8 ++++----
>  .../cgroup/cgroup_regression_test.sh           | 10 +++++-----
>  .../fs/quota_remount/quota_remount_test01.sh   |  2 +-
>  .../integrity/ima/tests/evm_overlay.sh         |  2 +-
>  .../tracing/dynamic_debug/dynamic_debug01.sh   |  2 +-
>  testcases/lib/tst_test.sh                      | 18 +++++++++++-------
>  6 files changed, 23 insertions(+), 19 deletions(-)
> 
> -- 
> 2.17.0