TrueNAS.pm::qemu_blockdev_options returns an iscsi:// blockdev — wrong for
multipath where path() returns /dev/mapper/<wwid>. Simply removing the override
caused the parent's iscsi driver to be inherited instead.
Fix: explicitly call PVE::Storage::Plugin::qemu_blockdev_options (the
grandparent). It calls path(), sees /dev/mapper/<wwid> starts with '/',
stats it as S_ISBLK, and returns { driver => 'host_device', filename => ... }.
QEMU receives: "driver":"host_device","filename":"/dev/mapper/<wwid>"
Tested: VM 103 started with multipath disk (vm-103-disk-0 on TrueNAS-Scale01-MP).
QEMU confirmed using host_device driver on /dev/mapper/36589cfc000000ad...
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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