Require mke2fs -F -F for really dangerous operations

Disambiguate the use of "-F" (force) flag for mke2fs to avoid dangerous
situations.  The use of -F is needed for regular backing files and
for filesystems on whole block devices.  It should NOT be confused
with mke2fs on an apparently-mounted or in-use filesystem.

Signed-off-by: Andreas Dilger <adilger@clusterfs.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
4 files changed