运行程序，测试U盘插入/拔除，输出如下：
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add@/devices/pci0000:00/0000:00:1d.7/usb2/2-1
add@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0
add@/module/usb_storage
add@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6
add@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/scsi_host/host6
add@/bus/usb/drivers/usb-storage
add@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0
add@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0
add@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0/scsi_disk/6:0:0:0
add@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0/scsi_device/6:0:0:0
add@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0/scsi_generic/sg2
add@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0/bsg/6:0:0:0
change@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0
add@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0/block/sdb
add@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0/block/sdb/sdb4
add@/devices/virtual/bdi/8:16
add@/module/fat
add@/kernel/slab/fat_cache
add@/kernel/slab/fat_inode_cache
add@/module/vfat
add@/module/nls_cp437
add@/module/nls_iso8859_1
remove@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0/bsg/6:0:0:0
remove@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0/scsi_generic/sg2
remove@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0/scsi_device/6:0:0:0
remove@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0/scsi_disk/6:0:0:0
remove@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0/block/sdb/sdb4
remove@/devices/virtual/bdi/8:16
remove@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0/block/sdb
remove@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/target6:0:0/6:0:0:0
remove@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6/scsi_host/host6
remove@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host6
remove@/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0
remove@/devices/pci0000:00/0000:00:1d.7/usb2/2-1
remove@/host6/target6:0:0