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[Qemu-devel] [PATCH 2/2] qcow2: cancel the modification on fail in qcow2


From: Wenchao Xia
Subject: [Qemu-devel] [PATCH 2/2] qcow2: cancel the modification on fail in qcow2_snapshot_create()
Date: Wed, 15 May 2013 16:43:39 +0800

Signed-off-by: Wenchao Xia <address@hidden>
---
 block/qcow2-snapshot.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
index a6065a9..ad030f9 100644
--- a/block/qcow2-snapshot.c
+++ b/block/qcow2-snapshot.c
@@ -410,6 +410,17 @@ int qcow2_snapshot_create(BlockDriverState *bs, 
QEMUSnapshotInfo *sn_info)
 #endif
     return 0;
 
+restore_refcount:
+    ret = qcow2_update_snapshot_refcount(bs, s->l1_table_offset,
+                                         s->l1_size, -1);
+    if (ret < 0) {
+        /* Nothing can be done none now, need image check later */
+        error_report("qcow2: Error in restoring refcount in snapshot");
+    }
+
+dealloc_cluster:
+    qcow2_free_clusters(bs, sn->l1_table_offset, sn->l1_size);
+
 fail:
     g_free(sn->id_str);
     g_free(sn->name);
-- 
1.7.1





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