This addresses the data integrity problems which are described for qcow at http://wiki.qemu.org/Features/Qcow2DataIntegrity#Metadata_update_ordering.2C_Part_2 These problems are the same for all writable image formats, so this series contains a patch for each of them.
The only exception is VDI which uses AIO for writing its metadata. It needs a different fix. Kevin Wolf (6): block: Add bdrv_(p)write_sync cow: Use bdrv_(p)write_sync for metadata writes qcow: Use bdrv_(p)write_sync for metadata writes qcow2: Use bdrv_(p)write_sync for metadata writes vmdk: Use bdrv_(p)write_sync for metadata writes vpc: Use bdrv_(p)write_sync for metadata writes block.c | 37 +++++++++++++++++++++++++++++++++++++ block.h | 4 ++++ block/cow.c | 20 +++++++++++--------- block/qcow.c | 18 ++++++++++-------- block/qcow2-cluster.c | 24 ++++++++++++------------ block/qcow2-refcount.c | 24 ++++++++++++------------ block/qcow2-snapshot.c | 23 +++++++++++------------ block/qcow2.c | 10 +++++----- block/vmdk.c | 10 +++++----- block/vpc.c | 9 +++++---- 10 files changed, 112 insertions(+), 67 deletions(-)
