The lazy refcounts bit indicates that this image can take advantage of
the dirty bit and that refcount updates can be postponed.
Signed-off-by: Stefan Hajnoczi <stefa...@linux.vnet.ibm.com>
---
docs/specs/qcow2.txt | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/docs/specs/qcow2.txt b/docs/specs/qcow2.txt
index 3a789ce..8b2c0eb 100644
--- a/docs/specs/qcow2.txt
+++ b/docs/specs/qcow2.txt
@@ -85,7 +85,11 @@ in the description of a field.
Bitmask of compatible features. An implementation can
safely ignore any unknown bits that are set.
- Bits 0-63: Reserved (set to 0)
+ Bit 0: Lazy refcounts bit. If this bit is set then lazy
+ refcount updates can be used. This means postponing
+ marking the image file dirty and postponing refcount
+ metadata updates.
+ Bits 1-63: Reserved (set to 0)
88 - 95: autoclear_features
Bitmask of auto-clear features. An implementation may only
--
1.7.10
