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[Qemu-devel] [partial RFC 1/2] qcow2: modify spec for deduplication
From: |
Benoît Canet |
Subject: |
[Qemu-devel] [partial RFC 1/2] qcow2: modify spec for deduplication |
Date: |
Thu, 27 Sep 2012 16:29:57 +0200 |
---
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 36a559d..e8bc189 100644
--- a/docs/specs/qcow2.txt
+++ b/docs/specs/qcow2.txt
@@ -80,7 +80,10 @@ in the description of a field.
tables to repair refcounts before accessing the
image.
- Bits 1-63: Reserved (set to 0)
+ Bit 1: Deduplication bit. If this bit is set then
+ deduplication is used on this image.
+
+ Bits 2-63: Reserved (set to 0)
80 - 87: compatible_features
Bitmask of compatible features. An implementation can
@@ -116,6 +119,7 @@ be stored. Each extension has a structure like the
following:
0x00000000 - End of the header extension area
0xE2792ACA - Backing file format name
0x6803f857 - Feature name table
+ 0xCD8E819B - Deduplication table offset and length
other - Unknown header extension, can be safely
ignored
--
1.7.10.4