[Xen-changelog] [xen-unstable] ioemu: Two qcow2 bug fixes from upstream qemu.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1206638081 0
# Node ID 892a20f824a7aa5c5ed57ce80fc61f1dffd4b4d2
# Parent  17e30b91b9e2a6607d7b2a7db011ac2a4f11d1d1
ioemu: Two qcow2 bug fixes from upstream qemu.

[Qemu-devel] PATCH: qcow2 image corruption
http://lists.gnu.org/archive/html/qemu-devel/2007-03/msg00773.html

[Qemu-devel] [PATCH] qcow2: release refcount table clusters of the old
table, after growing the refcount table
http://lists.gnu.org/archive/html/qemu-devel/2007-04/msg00043.html

Signed-off-by: Kevin Wolf <kwolf@xxxxxxx>
---
 tools/ioemu/block-qcow2.c |    6 ++++++
 1 files changed, 6 insertions(+)

diff -r 17e30b91b9e2 -r 892a20f824a7 tools/ioemu/block-qcow2.c
--- a/tools/ioemu/block-qcow2.c Thu Mar 27 17:13:37 2008 +0000
+++ b/tools/ioemu/block-qcow2.c Thu Mar 27 17:14:41 2008 +0000
@@ -1886,6 +1886,8 @@ static int grow_refcount_table(BlockDriv
     int64_t table_offset;
     uint64_t data64;
     uint32_t data32;
+    int old_table_size;
+    int64_t old_table_offset;
 
     if (min_size <= s->refcount_table_size)
         return 0;
@@ -1931,10 +1933,14 @@ static int grow_refcount_table(BlockDriv
                     &data32, sizeof(data32)) != sizeof(data32))
         goto fail;
     qemu_free(s->refcount_table);
+    old_table_offset = s->refcount_table_offset;
+    old_table_size = s->refcount_table_size;
     s->refcount_table = new_table;
     s->refcount_table_size = new_table_size;
+    s->refcount_table_offset = table_offset;
 
     update_refcount(bs, table_offset, new_table_size2, 1);
+    free_clusters(bs, old_table_offset, old_table_size * sizeof(uint64_t));
     return 0;
  fail:
     free_clusters(bs, table_offset, new_table_size2);

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