[LTP] [PATCH 4/4] shell: Use $FS_TYPE and $TST_DEVICE as default params in tst_mkfs()

[Petr Vorel]

Hi Cyril,

> Hi!
> This one is OK apart from the names for the variables, i.e. FS_TYPE
> should get TST_ prefix and TST_MOUNT should became TST_MNTPOINT.
Thanks for the review. Good points, do that + document TST_FS_TYPE.

Kind regards,
Petr