Description of problem:
Virtual floppy locked value remains 0 regardless of using or not in guest

Version-Release number of selected component (if applicable):
kvm version:
kvm-83-232.el5


How reproducible:
100%

Steps to Reproduce:
1.boot guest with -fda /root/zhangjunyi/test.vfd
#/usr/libexec/qemu-kvm -M rhel5.6.0 -m 4G -smp 8 -name rhel5.7_64 -uuid 02b8079c-cca0-ae65-c63a-b2aa4119497d -monitor stdio -no-kvm-pit-reinjection -startdate now -boot c -drive  file=/root/zhangjunyi/rhel57.qcow2,if=virtio,format=qcow2,werror=stop,cache=none,boot=on -net nic,macaddr=54:52:40:3d:4c:88,vlan=0,model=virtio -net tap,script=/etc/qemu-ifup,downscript=no,vlan=0 -usb -k en-us -balloon none -notify all -cdrom /root/zhangjunyi/boot.iso -vnc :10 -fda /root/zhangjunyi/test.vfd

2.check block status,please note,locked=0
(qemu) info block
virtio0: type=hd removable=0 file=/root/zhangjunyi/rhel57.qcow2 ro=0 drv=qcow2 encrypted=0
ide1-cd0: type=cdrom removable=1 locked=0 file=/root/zhangjunyi/boot.iso ro=1 drv=raw encrypted=0
floppy0: type=floppy removable=1 locked=0 file=/root/zhangjunyi/test.vfd ro=0 drv=qcow2 encrypted=0
sd0: type=floppy removable=1 locked=0 [not inserted]

3.in guest,mount fd0 to /mnt
mount /dev/fd0 /mnt

4. check block status again,please note,still locked=0
(qemu) info block
virtio0: type=hd removable=0 file=/root/zhangjunyi/rhel57.qcow2 ro=0 drv=qcow2 encrypted=0
ide1-cd0: type=cdrom removable=1 locked=1 file=/root/zhangjunyi/boot.iso ro=1 drv=raw encrypted=0
floppy0: type=floppy removable=1 locked=0 file=/root/zhangjunyi/test.vfd ro=0 drv=qcow2 encrypted=0
sd0: type=floppy removable=1 locked=0 [not inserted]

locked=0 means can eject floppy in (qemu) regardless of using or not in guest 
  
Actual results:
locked value remain 0 even this virtual floppy is using by guest.

Expected results:
locked value should as 1.

Additional info:
1.if locked=0 even virtual floppy is using by guest,user still can reject this virtual floppy via (qemu) eject floppy0,however,guest don't know that.

EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
floppy0: disk absent or changed during operation
end_request: I/O error, dev fd0, sector 22
floppy0: disk absent or changed during operation
end_request: I/O error, dev fd0, sector 2
Buffer I/O error on device fd0, logical block 1
lost page write due to I/O error on fd0
EXT2-fs error (device fd0): ext2_get_inode: unable to read inode block - inode=11, block=11

2.take cdrom for example.
if we mount cdrom device in guest.then locks=1.
if we umount it.then locks=0.