motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-06 17:23:56 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

qcow2: Set zero flag for discarded clusters

Browse source 
Instead of making the backing file contents visible again after a discard
request, set the zero flag if possible (i.e. on version >= 3).

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2014-02-08 14:38:33 +01:00
parent 3e890c77cf
commit a71835a0cc
2 changed files with 34 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

18
tests/qemu-iotests/046
View file

@ -193,6 +193,16 @@ echo "== Verify image content =="
function verify_io()
{
if ($QEMU_IMG info -f "$IMGFMT" "$TEST_IMG" | grep "compat: 0.10" > /dev/null); then
# For v2 images, discarded clusters are read from the backing file
# Keep the variable empty so that the backing file value can be used as
# the default below
discarded=
else
# Discarded clusters are zeroed for v3 or later
discarded=0
fi
echo read -P 0 0 0x10000
echo read -P 1 0x10000 0x2000
@ -221,16 +231,16 @@ function verify_io()
echo read -P 70 0x78000 0x6000
echo read -P 7 0x7e000 0x2000
echo read -P 8 0x80000 0x6000
echo read -P ${discarded:-8} 0x80000 0x6000
echo read -P 80 0x86000 0x2000
echo read -P 8 0x88000 0x2000
echo read -P ${discarded:-8} 0x88000 0x2000
echo read -P 81 0x8a000 0xe000
echo read -P 90 0x98000 0x6000
echo read -P 9 0x9e000 0x2000
echo read -P 10 0xa0000 0x6000
echo read -P ${discarded:-10} 0xa0000 0x6000
echo read -P 100 0xa6000 0x2000
echo read -P 10 0xa8000 0x2000
echo read -P ${discarded:-10} 0xa8000 0x2000
echo read -P 101 0xaa000 0xe000
echo read -P 110 0xb8000 0x8000