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backup: Deal with filters

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Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Max Reitz 2019-06-12 17:46:45 +02:00 • committed by Kevin Wolf
parent 3f072a7fb7
commit 2b088c60bb
3 changed files with 21 additions and 9 deletions
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19
blockdev.c
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@ -1741,7 +1741,13 @@ static void drive_backup_prepare(BlkActionState *common, Error **errp)
* on top of.
*/
if (backup->sync == MIRROR_SYNC_MODE_TOP) {
source = backing_bs(bs);
/*
* Backup will not replace the source by the target, so none
* of the filters skipped here will be removed (in contrast to
* mirror). Therefore, we can skip all of them when looking
* for the first COW relationship.
*/
source = bdrv_cow_bs(bdrv_skip_filters(bs));
if (!source) {
backup->sync = MIRROR_SYNC_MODE_FULL;
}
@ -1761,9 +1767,14 @@ static void drive_backup_prepare(BlkActionState *common, Error **errp)
if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
assert(backup->format);
if (source) {
bdrv_refresh_filename(source);
bdrv_img_create(backup->target, backup->format, source->filename,
source->drv->format_name, NULL,
/* Implicit filters should not appear in the filename */
BlockDriverState *explicit_backing =
bdrv_skip_implicit_filters(source);
bdrv_refresh_filename(explicit_backing);
bdrv_img_create(backup->target, backup->format,
explicit_backing->filename,
explicit_backing->drv->format_name, NULL,
size, flags, false, &local_err);
} else {
bdrv_img_create(backup->target, backup->format, NULL, NULL, NULL,