From: Stefan Hajnoczi <stefa...@linux.vnet.ibm.com>
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>
Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
docs/specs/qcow2.txt | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/docs/specs/qcow2.txt b/docs/specs/qcow2.txt
index 339cdc1..36a559d 100644
--- a/docs/specs/qcow2.txt
+++ b/docs/specs/qcow2.txt
@@ -86,7 +86,12 @@ 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
+ 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
--
1.7.6.5
