ShuriZma
/
xqemu
mirror of https://github.com/xqemu/xqemu.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

docs: add lazy refcounts bit to qcow2 specification 

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 <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2012-07-27 09:05:20 +01:00 committed by Kevin Wolf
parent c61d0004bc
commit dae8796d00
1 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
docs/specs/qcow2.txt
View File

@ -86,7 +86,12 @@ in the description of a field.
Bitmask of compatible features. An implementation can Bitmask of compatible features. An implementation can
safely ignore any unknown bits that are set. 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 88 - 95: autoclear_features
Bitmask of auto-clear features. An implementation may only Bitmask of auto-clear features. An implementation may only