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-rw-r--r--docs/specs/qcow2.txt7
1 files changed, 6 insertions, 1 deletions
diff --git a/docs/specs/qcow2.txt b/docs/specs/qcow2.txt
index 36a559d886..33eca360cc 100644
--- a/docs/specs/qcow2.txt
+++ b/docs/specs/qcow2.txt
@@ -80,7 +80,12 @@ in the description of a field.
tables to repair refcounts before accessing the
image.
- Bits 1-63: Reserved (set to 0)
+ Bit 1: Corrupt bit. If this bit is set then any data
+ structure may be corrupt and the image must not
+ be written to (unless for regaining
+ consistency).
+
+ Bits 2-63: Reserved (set to 0)
80 - 87: compatible_features
Bitmask of compatible features. An implementation can