tune2fs: confirm dangerous operations

Give admins a short amount of time to confirm that they want to
proceed with a dangerous operation.  Refuse to perform the op
unless the filesystem is freshly checked.

Cc: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
4 files changed