1 files changed, 15 insertions, 0 deletions
diff --git a/block.c b/block.c
index 45ad6fb4b9..da0930cbba 100644
--- a/block.c
+++ b/block.c
@@ -408,6 +408,16 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
     }
     bs->drv = drv;
     bs->opaque = qemu_mallocz(drv->instance_size);
+
+    /*
+     * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
+     * write cache to the guest.  We do need the fdatasync to flush
+     * out transactions for block allocations, and we maybe have a
+     * volatile write cache in our backing device to deal with.
+     */
+    if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
+        bs->enable_write_cache = 1;
+
     /* Note: for compatibility, we open disk image files as RDWR, and
        RDONLY as fallback */
     if (!(flags & BDRV_O_FILE))
@@ -918,6 +928,11 @@ int bdrv_is_sg(BlockDriverState *bs)
     return bs->sg;
 }
 
+int bdrv_enable_write_cache(BlockDriverState *bs)
+{
+    return bs->enable_write_cache;
+}
+
 /* XXX: no longer used */
 void bdrv_set_change_cb(BlockDriverState *bs,
                         void (*change_cb)(void *opaque), void *opaque)