[Qemu-devel] [PATCH 3/3] vvfat: Use cache=unsafe

[Kevin Wolf]

The qcow file used for write support in vvfat is a temporary file,
so we can use cache=unsafe there. Without this, write support is just
too slow to be of any use.

Signed-off-by: Kevin Wolf <address@hidden>
---
 block/vvfat.c |   14 ++++++++++----
 1 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/block/vvfat.c b/block/vvfat.c
index 0772037..53e57bf 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -2788,6 +2788,7 @@ static int enable_write_target(BDRVVVFATState *s)
 {
     BlockDriver *bdrv_qcow;
     QEMUOptionParameter *options;
+    int ret;
     int size = sector2cluster(s, s->sector_count);
     s->used_clusters = calloc(size, 1);
 
@@ -2803,11 +2804,16 @@ static int enable_write_target(BDRVVVFATState *s)
 
     if (bdrv_create(bdrv_qcow, s->qcow_filename, options) < 0)
        return -1;
+
     s->qcow = bdrv_new("");
-    if (s->qcow == NULL ||
-        bdrv_open(s->qcow, s->qcow_filename, BDRV_O_RDWR, bdrv_qcow) < 0)
-    {
-       return -1;
+    if (s->qcow == NULL) {
+        return -1;
+    }
+
+    ret = bdrv_open(s->qcow, s->qcow_filename,
+            BDRV_O_RDWR | BDRV_O_CACHE_WB | BDRV_O_NO_FLUSH, bdrv_qcow);
+    if (ret < 0) {
+       return ret;
     }
 
 #ifndef _WIN32
-- 
1.6.0.2