commit 362fdf170cb19301f70bc004e85dc82f83901afc
author Kevin Wolf <kwolf@redhat.com> Mon May 22 17:17:49 2017 +0200
committer Kevin Wolf <kwolf@redhat.com> Fri Jun 09 11:45:03 2017 +0200
tree d18099d73482d2a63583ff09685e8c71c4004478
parent f07fa4cbf0b16426dc5a03d4e13943143eaeb1ce

migration/block: Clean up BBs in block_save_complete()

We need to release any block migrations BlockBackends on the source
before successfully completing the migration because otherwise
inactivating the images will fail (inactivation only tolerates device
BBs).

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>

migration/block.c

diff --git a/migration/block.c b/migration/block.c
index 4d8c2e9..114cedb 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -674,16 +674,14 @@
     return dirty << BDRV_SECTOR_BITS;
 }
 
-/* Called with iothread lock taken.  */
 
-static void block_migration_cleanup(void *opaque)
+
+/* Called with iothread lock taken.  */
+static void block_migration_cleanup_bmds(void)
 {
     BlkMigDevState *bmds;
-    BlkMigBlock *blk;
     AioContext *ctx;
 
-    bdrv_drain_all();
-
     unset_dirty_tracking();
 
     while ((bmds = QSIMPLEQ_FIRST(&block_mig_state.bmds_list)) != NULL) {
@@ -701,6 +699,16 @@
         g_free(bmds->aio_bitmap);
         g_free(bmds);
     }
+}
+
+/* Called with iothread lock taken.  */
+static void block_migration_cleanup(void *opaque)
+{
+    BlkMigBlock *blk;
+
+    bdrv_drain_all();
+
+    block_migration_cleanup_bmds();
 
     blk_mig_lock();
     while ((blk = QSIMPLEQ_FIRST(&block_mig_state.blk_list)) != NULL) {
@@ -844,6 +852,10 @@
 
     qemu_put_be64(f, BLK_MIG_FLAG_EOS);
 
+    /* Make sure that our BlockBackends are gone, so that the block driver
+     * nodes can be inactivated. */
+    block_migration_cleanup_bmds();
+
     return 0;
 }