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[Qemu-devel] [RFC 3/7] docs: add lazy refcounts bit to qcow2 specificati
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [RFC 3/7] docs: add lazy refcounts bit to qcow2 specification |
Date: |
Fri, 22 Jun 2012 16:08:42 +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 | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/docs/specs/qcow2.txt b/docs/specs/qcow2.txt
index 3a789ce..8b2c0eb 100644
--- a/docs/specs/qcow2.txt
+++ b/docs/specs/qcow2.txt
@@ -85,7 +85,11 @@ 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
- Re: [Qemu-devel] [RFC 5/7] qcow2: implement lazy refcounts, (continued)
- [Qemu-devel] [RFC 2/7] qcow2: introduce dirty bit, Stefan Hajnoczi, 2012/06/22
- [Qemu-devel] [RFC 1/7] docs: add dirty bit to qcow2 specification, Stefan Hajnoczi, 2012/06/22
- [Qemu-devel] [RFC 4/7] qemu-iotests: ignore qemu-img create lazy_refcounts output, Stefan Hajnoczi, 2012/06/22
- [Qemu-devel] [RFC 7/7] qemu-iotests: add 039 qcow2 lazy refcounts test, Stefan Hajnoczi, 2012/06/22
- [Qemu-devel] [RFC 6/7] qemu-io: add "abort" command to simulate program crash, Stefan Hajnoczi, 2012/06/22
- [Qemu-devel] [RFC 3/7] docs: add lazy refcounts bit to qcow2 specification,
Stefan Hajnoczi <=
- Re: [Qemu-devel] [RFC 0/7] qcow2: implement lazy refcounts optimization, Zhi Yong Wu, 2012/06/25