[Qemu-devel] [STABLE PATCH 2/6] qcow2: Clear L2 table cache after write error

[Kevin Wolf]

If the L2 table was already updated in cache, but writing it to disk has
failed, we must not continue using the changed version in the cache to stay
consistent with what's on the disk.

Signed-off-by: Kevin Wolf <kw...@redhat.com>
(cherry picked from commit 1b7c801b40ce90795397bb566d019c9b76ef9c13)

Conflicts:

        block/qcow2-cluster.c

Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
 block/qcow2-cluster.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index c7057b1..0dc4f1d 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -672,8 +672,9 @@ int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, 
QCowL2Meta *m)
                     (i << s->cluster_bits)) | QCOW_OFLAG_COPIED);
      }
 
-    if (write_l2_entries(s, l2_table, l2_offset, l2_index, m->nb_clusters) < 
0) {
-        ret = -1;
+    ret = write_l2_entries(s, l2_table, l2_offset, l2_index, m->nb_clusters);
+    if (ret < 0) {
+        qcow2_l2_cache_reset(bs);
         goto err;
     }
 
-- 
1.6.6.1