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Protect smbd against version incompatibilities in a cluster.
At first startup smbd locks "samba_version_string" and writes its version
string. It then downgrades the lock to a read lock. Subsequent smbds check
against the version string and also keep the read lock around. If the version
does not match, we try to write our own version. But as there's a read lock,
the lock upgrade to write lock will fail due the read lock being around. So as
long as there's one smbd with this read lock, no other version of smbd will be
able to start.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
26932271a8