[Qemu-devel] [PATCH 1.2 3/7] block: always open protocol in writeback mode

[Paolo Bonzini <pbonzini@redhat.com>]

Formats are entirely in charge of flushes for metadata writes.  For
guest-initiated writes, a writethrough cache is faked in the block layer.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 block.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/block.c b/block.c
index 7add33c..43b3de6 100644
--- a/block.c
+++ b/block.c
@@ -661,7 +661,7 @@ static int bdrv_open_common(BlockDriverState *bs, const char *filename,
     if (drv->bdrv_file_open) {
         ret = drv->bdrv_file_open(bs, filename, open_flags);
     } else {
-        ret = bdrv_file_open(&bs->file, filename, open_flags);
+        ret = bdrv_file_open(&bs->file, filename, open_flags | BDRV_O_CACHE_WB);
         if (ret >= 0) {
             ret = drv->bdrv_open(bs, open_flags);
         }
-- 
1.7.1