[Bug 229929] makefs(8) can underestimate image size

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229929

Alan Somers <asomers at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|bugs at FreeBSD.org            |mckusick at FreeBSD.org
             Status|New                         |Open

--- Comment #2 from Alan Somers <asomers at FreeBSD.org> ---
Additional info:

The smallest value of -M that makes this testcase pass is "-M 753665".  I think
the problem probably lies in ffs_size_dir in usr.sbin/makefs/ffs.c.  That's the
function that does most of the size estimation.  However, it relies on intimate
knowledge of FFS's internals.  Assigning to the resident FFS expert.

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