[LTP] [PATCH v6 2/3] syscalls/copy_file_range01: add cross-device test

[Yang Xu]

> Hi,
>
>>> Amir has relaxed cross-device constraint since commit[1], I think we can test it in
>>> copy_file_range01.
>>> [1]https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5dae222a5
>>> Signed-off-by: Yang Xu<xuyang2018.jy@cn.fujitsu.com>
>>> Reviewed-by: Amir Goldstein<amir73il@gmail.com>
>> Now sent to the correct patchset version:
>> Whole patchset LGTM, but here we got quite a lot of failures after increasing
>> test coverage with .all_filesystems = 1 (which use should be noted in commit
>> message):
>> copy_file_range02.c:120: FAIL: copy_file_range failed unexpectedly; expected EOVERFLOW, but got: EINVAL
>> copy_file_range02.c:126: FAIL: copy_file_range returned wrong value: 16
>> ...
>> copy_file_range02.c:126: FAIL: copy_file_range returned wrong value: 16
Hi Petr
can you give more information? such as distros, filesystem, envrionment,  do you get 16(EBUSY) on all filesystems?
Because on my machine, I get the following result on 4.18.0-80.el8.x86_64(I test on vfat, extN,xfs,btrfs).

copy_file_range02.c:118: PASS: copy_file_range failed as expected: EBADF
copy_file_range02.c:118: PASS: copy_file_range failed as expected: EISDIR
copy_file_range02.c:118: PASS: copy_file_range failed as expected: EBADF
copy_file_range02.c:118: PASS: copy_file_range failed as expected: EBADF
copy_file_range02.c:118: PASS: copy_file_range failed as expected: EINVAL
copy_file_range02.c:127: FAIL: copy_file_range returned wrong value: 32
copy_file_range02.c:127: FAIL: copy_file_range returned wrong value: 0
copy_file_range02.c:127: FAIL: copy_file_range returned wrong value: 0
copy_file_range02.c:118: PASS: copy_file_range failed as expected: EINVAL
copy_file_range02.c:118: PASS: copy_file_range failed as expected: EINVAL
copy_file_range02.c:118: PASS: copy_file_range failed as expected: EINVAL
copy_file_range02.c:122: FAIL: copy_file_range failed unexpectedly; expected EOVERFLOW, but got: EINVAL
copy_file_range02.c:127: FAIL: copy_file_range returned wrong value: 0


> Also .mount_device = 1 and .all_filesystems = 1 require
> .needs_root = 1 definition or you get
>
> tst_device.c:97: INFO: Not allowed to open /dev/loop-control. Are you root?: EACCES
> tst_device.c:132: INFO: No free devices found
> tst_device.c:308: BROK: Failed to acquire device
>
> BTW I wonder whether these could be detected automatically.
Here needs root because /dev/loop-control needs it.  But it doesn't represent mount_device and all_filesystems
  need root.
Or, I misunderstand your idea?

> Kind regards,
> Petr
>
>
> .
>