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| author | Max Reitz | 2014-10-24 15:57:32 +0200 |
|---|---|---|
| committer | Stefan Hajnoczi | 2014-11-03 12:41:48 +0100 |
| commit | 94054183daffaa41cd77ced9301c01a01027923a (patch) | |
| tree | 75c6d4efe55d181cee75d7e3eaaf59ecbf1e9aa5 /qapi | |
| parent | qcow2: Implement bdrv_make_empty() (diff) | |
| download | qemu-94054183daffaa41cd77ced9301c01a01027923a.tar.gz qemu-94054183daffaa41cd77ced9301c01a01027923a.tar.xz qemu-94054183daffaa41cd77ced9301c01a01027923a.zip | |
qcow2: Optimize bdrv_make_empty()
bdrv_make_empty() is currently only called if the current image
represents an external snapshot that has been committed to its base
image; it is therefore unlikely to have internal snapshots. In this
case, bdrv_make_empty() can be greatly sped up by emptying the L1 and
refcount table (while having the dirty flag set, which only works for
compat=1.1) and creating a trivial refcount structure.
If there are snapshots or for compat=0.10, fall back to the simple
implementation (discard all clusters).
[Applied s/clusters/cluster/ typo fix suggested by Eric Blake
--Stefan]
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1414159063-25977-4-git-send-email-mreitz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'qapi')
0 files changed, 0 insertions, 0 deletions