xfs: validate sb_logsunit is a multiple of the fs blocksize
Make sure the log stripe unit is sane before proceeding with mounting. AFAICT this means that logsunit has to be 0, 1, or a multiple of the fs block size. Found this by setting the LSB of logsunit in xfs/350 and watching the system crash as soon as we try to write to the log. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
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