Description of problem:

qemu do not close src image immediately after mirroring done

Version-Release number of selected component (if applicable):
qemu-img-rhev-2.1.0-1.el7.x86_64
qemu-kvm-common-rhev-2.1.0-1.el7.x86_64
libcacard-devel-rhev-2.1.0-1.el7.x86_64
libcacard-rhev-2.1.0-1.el7.x86_64
qemu-kvm-rhev-2.1.0-1.el7.x86_64
qemu-kvm-tools-rhev-2.1.0-1.el7.x86_64
qemu-kvm-rhev-debuginfo-2.1.0-1.el7.x86_64


How reproducible:
1 / 1

Steps to Reproduce:
0. Prepare two LVMs, 10G *1, 32G *1, and convert a OS img into the 10G(origin img should has 30G virtual size and < 10G actual size)


1.boot a vm
/bin/qemu-kvm -monitor stdio  \
    -S  \
    -name 'virt-tests-vm1'  \
    -sandbox off  \
    -M pc  \
    -nodefaults  \
    -vga std  \
    -chardev socket,id=qmp_id_qmpmonitor1,path=/tmp/monitor-qmpmonitor1-20140815-110559-kPOHZHpD,server,nowait \
    -mon chardev=qmp_id_qmpmonitor1,mode=control  \
    -chardev socket,id=serial_id_serial0,path=/tmp/serial-serial0-20140815-110559-kPOHZHpD,server,nowait \
    -device isa-serial,chardev=serial_id_serial0  \
    -chardev socket,id=seabioslog_id_20140815-110559-kPOHZHpD,path=/tmp/seabios-20140815-110559-kPOHZHpD,server,nowait \
    -device isa-debugcon,chardev=seabioslog_id_20140815-110559-kPOHZHpD,iobase=0x402 \
    -device ich9-usb-uhci1,id=usb1,bus=pci.0,addr=03 \
    -drive id=drive_image1,if=none,cache=none,snapshot=off,aio=native,file='/dev/rhel/lv10g' \
    -device ide-hd,id=image1,drive=drive_image1,bus=ide.0,unit=0 \
    -device virtio-net-pci,mac=9a:a2:a3:a4:a5:a6,id=id4CoZYU,vectors=4,netdev=idd5Ponr,bus=pci.0,addr=04  \
    -netdev tap,id=idd5Ponr,vhost=on  \
    -m 4096  \
    -smp 4,maxcpus=4,cores=2,threads=1,sockets=2  \
    -cpu 'SandyBridge'  \
    -drive id=drive_cd1,if=none,snapshot=off,aio=native,media=cdrom,file=/root/staf-kvm-devel/autotest-devel/client/tests/virt/shared/data/isos/windows/winutils.iso \
    -device ide-cd,id=cd1,drive=drive_cd1,bus=ide.0,unit=1 \
    -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1  \
    -vnc :0  \
    -rtc base=localtime,clock=host,driftfix=slew  \
    -boot order=cdn,once=c,menu=off \
    -enable-kvm
# info block
drive_image1: /dev/rhel/lv10g (qcow2)
    I/O status:       nospace

drive_cd1: /root/staf-kvm-devel/autotest-devel/client/tests/virt/shared/data/isos/windows/winutils.iso (raw, read-only)
    Removable device: not locked, tray closed

2. mirror the img
{"execute": "drive-mirror", "arguments": {"device": "drive_image1", "mode": "absolute-paths", "format": "qcow2", "target": "/dev/rhel/raw30g", "sync": "full"}, "id": "rUUcP4XX"}
{"return": {}, "id": "rUUcP4XX"}

3. tell qemu to switch the underlying storage
{"execute": "block-job-complete", "arguments": { "device": "drive_image1"} }
{"return": {}}

4. lsof to check both src and target image
[root@localhost ~]# lsof /dev/rhel/lv10g
COMMAND    PID USER   FD   TYPE DEVICE    SIZE/OFF     NODE NAME
qemu-kvm 30966 root   30u   BLK  253,3 0x280000000 29334404 /dev/rhel/../dm-3
[root@localhost ~]# lsof /dev/rhel/raw30g
COMMAND    PID USER   FD   TYPE DEVICE    SIZE/OFF     NODE NAME
qemu-kvm 30966 root   26u   BLK  253,4 0x800000000 29334414 /dev/rhel/../dm-4

5. reboot the VM, and keep filling it's space(till the data > 10G, so that cant held on the src lvm ),
then it closed the src img
[root@localhost ~]# lsof /dev/rhel/lv10g
[root@localhost ~]# lsof /dev/rhel/raw30g
COMMAND    PID USER   FD   TYPE DEVICE    SIZE/OFF     NODE NAME
qemu-kvm 30966 root   26u   BLK  253,4 0x800000000 29334414 /dev/rhel/../dm-4

Actual results:
as 4 shown
Expected results:
step 4 should got same output as 5 shown.

Additional info:

tested on RHEL.6.6, qemu closed the src immediately.