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fe65a86cbc
When not obtaining device from udev, we are doing deep devdir scan, and at the same time we try to insert everything what /sys/dev/block knows about. However in case lvm2 is configured to use nonstardard devdir this way it will see (and scan) devices from a real system. lvm2 test suite is using its own test devdir with its own device nodes. To avoid touching real /dev devices, validate the device node exist in give dir and do not insert such device into a cache. With obtain list from udev this patch has no effect (the normal user path).