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Copy snapshots out of QCOW2 disk

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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>
This commit is contained in:
edison 2010-09-21 19:58:41 -07:00 • committed by Kevin Wolf
parent a58b8d5401
commit 51ef67270b
9 changed files with 75 additions and 5 deletions
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16
block.c
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@ -1899,6 +1899,22 @@ int bdrv_snapshot_list(BlockDriverState *bs,
return -ENOTSUP;
}
int bdrv_snapshot_load_tmp(BlockDriverState *bs,
const char *snapshot_name)
{
BlockDriver *drv = bs->drv;
if (!drv) {
return -ENOMEDIUM;
}
if (!bs->read_only) {
return -EINVAL;
}
if (drv->bdrv_snapshot_load_tmp) {
return drv->bdrv_snapshot_load_tmp(bs, snapshot_name);
}
return -ENOTSUP;
}
#define NB_SUFFIXES 4
char *get_human_readable_size(char *buf, int buf_size, int64_t size)