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# Date Author Comment
69c98726 08/30/2013 04:48 pm Max Reitz

qcow2: Add corrupt bit

This adds an incompatible bit indicating corruption to qcow2. Any image
with this bit set may not be written to unless for repairing (and
subsequently clearing the bit if the repair has been successful).

Signed-off-by: Max Reitz <>...
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 <>...