commit 5a67a1048e1294b35940e7432d57d8cd801e6571
author Marcelo Tosatti <mtosatti@redhat.com> Mon Mar 26 21:22:10 2012 -0300
committer Kevin Wolf <kwolf@redhat.com> Thu Apr 05 15:11:37 2012 +0200
tree 15c28cf4bfa490b0101a98c3d2f387cbf1baac4e
parent 28d3d1658a3692f9c34c3ecce14941faa1d2fe92

block stream: close unused files and update ->backing_hd

Close the now unused images that were part of the previous backing file
chain and adjust ->backing_hd, backing_filename and backing_format
properly.

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=801449

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block/stream.c

diff --git a/block/stream.c b/block/stream.c
index 61ff7a2..0efe1ad 100644
--- a/block/stream.c
+++ b/block/stream.c
@@ -76,6 +76,39 @@
     return bdrv_co_copy_on_readv(bs, sector_num, nb_sectors, &qiov);
 }
 
+static void close_unused_images(BlockDriverState *top, BlockDriverState *base,
+                                const char *base_id)
+{
+    BlockDriverState *intermediate;
+    intermediate = top->backing_hd;
+
+    while (intermediate) {
+        BlockDriverState *unused;
+
+        /* reached base */
+        if (intermediate == base) {
+            break;
+        }
+
+        unused = intermediate;
+        intermediate = intermediate->backing_hd;
+        unused->backing_hd = NULL;
+        bdrv_delete(unused);
+    }
+    top->backing_hd = base;
+
+    pstrcpy(top->backing_file, sizeof(top->backing_file), "");
+    pstrcpy(top->backing_format, sizeof(top->backing_format), "");
+    if (base_id) {
+        pstrcpy(top->backing_file, sizeof(top->backing_file), base_id);
+        if (base->drv) {
+            pstrcpy(top->backing_format, sizeof(top->backing_format),
+                    base->drv->format_name);
+        }
+    }
+
+}
+
 /*
  * Given an image chain: [BASE] -> [INTER1] -> [INTER2] -> [TOP]
  *
@@ -223,6 +256,7 @@
             base_id = s->backing_file_id;
         }
         ret = bdrv_change_backing_file(bs, base_id, NULL);
+        close_unused_images(bs, base, base_id);
     }
 
     qemu_vfree(buf);