commit 51ef67270b1d10e1fcf3de7368dccad1ba0bf9d1
author edison <edison@cloud.com> Tue Sep 21 19:58:41 2010 -0700
committer Kevin Wolf <kwolf@redhat.com> Fri Oct 22 14:49:35 2010 +0200
tree a06b3ce03bae7ed77a1e1e9bebc6ead157c7a4e5
parent a58b8d5401b6064d52113f243456115d046bdd12

Copy snapshots out of QCOW2 disk

In order to backup snapshots, created from QCOW2 iamge, we want to copy snapshots out of QCOW2 disk to a seperate storage.
The following patch adds a new option in "qemu-img": qemu-img convert -f qcow2 -O qcow2 -s snapshot_name src_img bck_img.
Right now, it only supports to copy the full snapshot, delta snapshot is on the way.

Changes from V1: all the comments from Kevin are addressed:
Add read-only checking
Fix coding style
Change the name from bdrv_snapshot_load to bdrv_snapshot_load_tmp

Signed-off-by: Disheng Su <edison@cloud.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block.h

diff --git a/block.h b/block.h
index 5f64380..a4facf2 100644
--- a/block.h
+++ b/block.h
@@ -211,6 +211,8 @@
 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
 int bdrv_snapshot_list(BlockDriverState *bs,
                        QEMUSnapshotInfo **psn_info);
+int bdrv_snapshot_load_tmp(BlockDriverState *bs,
+                           const char *snapshot_name);
 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn);
 
 char *get_human_readable_size(char *buf, int buf_size, int64_t size);