selftests/filesystems: add a vfat RENAME_EXCHANGE test

Add a test for the renameat2 RENAME_EXCHANGE support in vfat, but split it
in a tool that just does the rename exchange and a script that is run by
the kselftests framework on `make TARGETS="filesystems/fat" kselftest`.

That way the script can be easily extended to test other file operations.

The script creates a 1 MiB disk image, that is then formated with a vfat
filesystem and mounted using a loop device.  That way all file operations
are done on an ephemeral filesystem.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Javier Martinez Canillas <[email protected]>
Acked-by: Muhammad Usama Anjum <[email protected]>
Acked-by: OGAWA Hirofumi <[email protected]>
Cc: Alexander Larsson <[email protected]>
Cc: Christian Kellner <[email protected]>
Cc: Chung-Chiang Cheng <[email protected]>
Cc: Colin Walters <[email protected]>
Cc: Lennart Poettering <[email protected]>
Cc: Peter Jones <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions