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[Qemu-devel] [PATCH 2/2] sheepdog: support 'qemu-img snapshot -a'


From: Liu Yuan
Subject: [Qemu-devel] [PATCH 2/2] sheepdog: support 'qemu-img snapshot -a'
Date: Thu, 6 Jun 2013 19:57:29 +0800

Just call sd_create_branch() to rollback the image is good enough

Cc: address@hidden
Cc: MORITA Kazutaka <address@hidden>
Cc: Kevin Wolf <address@hidden>
Cc: Stefan Hajnoczi <address@hidden>
Signed-off-by: Liu Yuan <address@hidden>
---
 block/sheepdog.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/block/sheepdog.c b/block/sheepdog.c
index 94218ac..cb5ca4a 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -2072,9 +2072,11 @@ static int sd_snapshot_goto(BlockDriverState *bs, const 
char *snapshot_id)
     }
 
     if (!s->inode.vm_state_size) {
-        error_report("Invalid snapshot");
-        ret = -ENOENT;
-        goto out;
+        /* qemu-img asks us to rollback, we need to do it right now */
+        ret = sd_create_branch(s);
+        if (ret) {
+            goto out;
+        }
     }
 
     s->is_snapshot = true;
-- 
1.7.9.5




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