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Add an attribute named 'removable' to the 'target' element of disks, which controls the removable flag. For instance, on a Linux guest it controls the value of /sys/block/$dev/removable. This option is only valid for USB disks (i.e. bus='usb'), and its default value is 'off', which is the same behaviour as before. To achieve this, 'removable=on' (or 'off') is appended to the '-device usb-storage' parameter sent to qemu when adding a USB disk via '-disk'. A capability flag QEMU_CAPS_USB_STORAGE_REMOVABLE was added to keep track if this option is supported by the qemu version used. Bug: https://bugzilla.redhat.com/show_bug.cgi?id=922495 Signed-off-by: Peter Krempa <pkrempa@redhat.com>