From f6186f49e2c98d91f22027d8c62996df4fcf3f92 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Beno=C3=AEt=20Canet?= <benoit@irqsave.net>
Date: Wed, 2 Oct 2013 14:33:48 +0200
Subject: block: Add BlockDriver.bdrv_check_ext_snapshot.

This field is used by blkverify to disable external snapshots creation.
It will also be used by block filters like quorum to disable external
snapshot creation.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 blockdev.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'blockdev.c')

diff --git a/blockdev.c b/blockdev.c
index 8c83f6f1ca..a91d5a87df 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1131,6 +1131,11 @@ static void external_snapshot_prepare(BlkTransactionState *common,
         }
     }
 
+    if (bdrv_check_ext_snapshot(state->old_bs) != EXT_SNAPSHOT_ALLOWED) {
+        error_set(errp, QERR_FEATURE_DISABLED, "snapshot");
+        return;
+    }
+
     flags = state->old_bs->open_flags;
 
     /* create new image w/backing file */
-- 
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