[Qemu-devel] [PATCH 16/16] block: Make cache=unsafe flush to the OS

[Kevin Wolf <kwolf@redhat.com>]

cache=unsafe completely ignored bdrv_flush, because flushing the host disk
costs a lot of performance. However, this means that qcow2 images (and
potentially any other format) can lose data even after the guest has issued a
flush if the qemu process crashes/is killed. In case of a host crash, data loss
is certainly expected with cache=unsafe, but if just the qemu process dies this
is a bit too unsafe.

Now that we have two separate flush functions, we can choose to flush
everythign to the OS, but don't enforce that it's physically written to the
disk.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/block.c b/block.c
index b1a4629..86910b0 100644
--- a/block.c
+++ b/block.c
@@ -2791,12 +2791,11 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs)
 {
     int ret;
 
-    if (bs->open_flags & BDRV_O_NO_FLUSH) {
-        return 0;
-    } else if (!bs->drv) {
+    if (!bs->drv) {
         return 0;
     }
 
+    /* Write back cached data to the OS even with cache=unsafe */
     if (bs->drv->bdrv_co_flush_to_os) {
         ret = bs->drv->bdrv_co_flush_to_os(bs);
         if (ret < 0) {
@@ -2804,6 +2803,11 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs)
         }
     }
 
+    /* But don't actually force it to the disk with cache=unsafe */
+    if (bs->open_flags & BDRV_O_NO_FLUSH) {
+        return 0;
+    }
+
     if (bs->drv->bdrv_co_flush_to_disk) {
         return bs->drv->bdrv_co_flush_to_disk(bs);
     } else if (bs->drv->bdrv_aio_flush) {
-- 
1.7.6.4