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# Date Author Comment
c61d0004 08/06/2012 11:39 pm Stefan Hajnoczi

qcow2: introduce dirty bit

This patch adds an incompatible feature bit to mark images that have not
been closed cleanly. When a dirty image file is opened a consistency
check and repair is performed.

Update qemu-iotests 031 and 036 since the extension header size changes...
bfe8043e 08/06/2012 11:39 pm Stefan Hajnoczi

qcow2: implement lazy refcounts

Lazy refcounts is a performance optimization for qcow2 that postpones
refcount metadata updates and instead marks the image dirty. In the
case of crash or power failure the image will be left in a dirty state
and repaired next time it is opened....
d551cd50 06/15/2012 03:03 pm Stefan Hajnoczi

qemu-iotests: add 036 autoclear feature bit test

This new test validates the autoclear feature bit behavior. When QEMU
opens a qcow2v3 image file with an unknown autoclear feature bit the bit
should be cleared in the image file header.

Signed-off-by: Stefan Hajnoczi <>...