Re: crypt-cleanup.sh question

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What is the rationale behind closing all /dev/mapper/luks-* devices which are not 'busy' in this shell script? Why would they have to be 'busy' (I presume already mapped) to be left open?

I am asking this because when the smartcard module opens a LUKS drive (not root - '/') - this drive later to be mapped from the actual root /etc/fstab file as '/dev/mapper/luks-XXX /some/directory' - this operation does not succeed and I presume crypt-cleanup.sh closes it up before the actual root can get it and therefore it cannot be mapped.
Further to the above, I was able to verify that the above script is indeed to blame for closing LUKS partitions. The only 'busy' partition at the time crypt-cleanup.sh runs is the root (/sysroot) so I don't see how a LUKS partition (other than root) specified at the kernel command line could be opened, unless I am missing something obvious...
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