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block: Disallow snapshots if the overlay doesn't support backing files

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This addresses scenarios like this one:

  { 'execute': 'blockdev-add', 'arguments':
    { 'options': { 'driver': 'qcow2',
                   'node-name': 'new0',
                   'file': { 'driver': 'file',
                             'filename': 'new.qcow2',
                             'node-name': 'file0' } } } }

  { 'execute': 'blockdev-snapshot', 'arguments':
    { 'node': 'virtio0',
      'overlay': 'file0' } }

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2015-11-03 12:32:35 +02:00 committed by Kevin Wolf
parent a0d64a61db
commit 08b24cfe37
1 changed files with 5 additions and 0 deletions
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blockdev.c
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@ -1678,6 +1678,11 @@ static void external_snapshot_prepare(BlkTransactionState *common,
if (state->new_bs->backing != NULL) {
error_setg(errp, "The snapshot already has a backing image");
return;
}
if (!state->new_bs->drv->supports_backing) {
error_setg(errp, "The snapshot does not support backing images");
}
}