[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v2 3/7] docs: add lazy refcounts bit to qcow2 specif
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH v2 3/7] docs: add lazy refcounts bit to qcow2 specification |
Date: |
Wed, 25 Jul 2012 13:21:20 +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..f2f4faa 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
+ 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
--
1.7.10.4
- Re: [Qemu-devel] [PATCH v2 7/7] qemu-iotests: add 039 qcow2 lazy refcounts test, (continued)
Re: [Qemu-devel] [PATCH v2 7/7] qemu-iotests: add 039 qcow2 lazy refcounts test, Kevin Wolf, 2012/07/26
[Qemu-devel] [PATCH v2 2/7] qcow2: introduce dirty bit, Stefan Hajnoczi, 2012/07/25
[Qemu-devel] [PATCH v2 4/7] qemu-iotests: ignore qemu-img create lazy_refcounts output, Stefan Hajnoczi, 2012/07/25
[Qemu-devel] [PATCH v2 6/7] qemu-io: add "abort" command to simulate program crash, Stefan Hajnoczi, 2012/07/25
[Qemu-devel] [PATCH v2 1/7] docs: add dirty bit to qcow2 specification, Stefan Hajnoczi, 2012/07/25
[Qemu-devel] [PATCH v2 3/7] docs: add lazy refcounts bit to qcow2 specification,
Stefan Hajnoczi <=