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[Qemu-devel] [PATCH v3 3/7] docs: add lazy refcounts bit to qcow2 specif
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH v3 3/7] docs: add lazy refcounts bit to qcow2 specification |
Date: |
Fri, 27 Jul 2012 09:05:20 +0100 |
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 <address@hidden>
---
docs/specs/qcow2.txt | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
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
--
1.7.10.4
- [Qemu-devel] [PATCH v3 0/7] qcow2: implement lazy refcounts optimization, Stefan Hajnoczi, 2012/07/27
- [Qemu-devel] [PATCH v3 5/7] qcow2: implement lazy refcounts, Stefan Hajnoczi, 2012/07/27
- [Qemu-devel] [PATCH v3 4/7] qemu-iotests: ignore qemu-img create lazy_refcounts output, Stefan Hajnoczi, 2012/07/27
- [Qemu-devel] [PATCH v3 3/7] docs: add lazy refcounts bit to qcow2 specification,
Stefan Hajnoczi <=
- [Qemu-devel] [PATCH v3 2/7] qcow2: introduce dirty bit, Stefan Hajnoczi, 2012/07/27
- [Qemu-devel] [PATCH v3 1/7] docs: add dirty bit to qcow2 specification, Stefan Hajnoczi, 2012/07/27
- [Qemu-devel] [PATCH v3 7/7] qemu-iotests: add 039 qcow2 lazy refcounts test, Stefan Hajnoczi, 2012/07/27
- [Qemu-devel] [PATCH v3 6/7] qemu-io: add "abort" command to simulate program crash, Stefan Hajnoczi, 2012/07/27