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blockdev: Use CAF in external_snapshot_prepare()

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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>
This commit is contained in:
Max Reitz 2019-06-12 18:34:46 +02:00 committed by Kevin Wolf
parent 07cd7b659a
commit 7cc734a9ea
1 changed files with 6 additions and 1 deletions
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7
blockdev.c
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@ -1562,7 +1562,12 @@ static void external_snapshot_prepare(BlkActionState *common,
goto out; 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"); error_setg(errp, "The overlay already has a backing image");
goto out; goto out;
} }