Change e2fsck to open non-mounted filesystems in exclusive mode

Thanks to Andreas Dilger for this idea.  If the filesystem is not mounted,
e2fsck will open it in exclusive mode to prevent the a confused/careless 
system administrator from mounting the filesystem while the filesystem 
check is taking place, which could cause all sorts of problems.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

2 files changed