diff options
| author | Max Reitz <mreitz@redhat.com> | 2019-06-12 18:34:46 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2020-09-07 12:31:31 +0200 |
| commit | 7cc734a9ea1c57afe3b3fdeaba33b6a7da73bca2 (patch) | |
| tree | 1f3b74b70b7cad9842435a2c70258b9e59f3ed69 /blockdev.c | |
| parent | 07cd7b659a7169ed4c5c6b45b48d8351566ed4cb (diff) | |
blockdev: Use CAF in external_snapshot_prepare()
This allows us to differentiate between filters and nodes with COW
backing files: Filters cannot be used as overlays at all (for this
function).
Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'blockdev.c')
| -rw-r--r-- | blockdev.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/blockdev.c b/blockdev.c index 862aa1b9aa..57ee41b73e 100644 --- a/blockdev.c +++ b/blockdev.c @@ -1562,7 +1562,12 @@ static void external_snapshot_prepare(BlkActionState *common, goto out; } - if (state->new_bs->backing != NULL) { + if (state->new_bs->drv->is_filter) { + error_setg(errp, "Filters cannot be used as overlays"); + goto out; + } + + if (bdrv_cow_child(state->new_bs)) { error_setg(errp, "The overlay already has a backing image"); goto out; } |