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[Qemu-devel] [PATCH] blockdev-backup: enable non-root nodes for backup

From: Vladimir Sementsov-Ogievskiy
Subject: [Qemu-devel] [PATCH] blockdev-backup: enable non-root nodes for backup
Date: Thu, 9 Nov 2017 17:16:31 +0300

This is needed to implement image-fleecing scheme, when we create
a temporary node, mark our active node to be backing for the temp,
and start backup(sync=none) from active node to the temp node.
Temp node then represents a kind of snapshot and may be used
for external backup through NBD.

Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>

What was the reason to abandon non-root nodes?

 blockdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/blockdev.c b/blockdev.c
index 56a6b24a0b..d0a5a107f0 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -3345,7 +3345,7 @@ BlockJob *do_blockdev_backup(BlockdevBackup *backup, 
BlockJobTxn *txn,
         backup->compress = false;
-    bs = qmp_get_root_bs(backup->device, errp);
+    bs = bdrv_lookup_bs(backup->device, backup->device, errp);
     if (!bs) {
         return NULL;

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