Xen devel - Feb 2009 - [PATCH]ioemu:using write-back as the default cache mode

The default cache mode has been changed from write-back to
write-through after merging in Oct 23. And this make the guest
boot slowly with qcow. This patch changes it to write-back again.

Best Regards
--yang

diff --git a/xenstore.c b/xenstore.c
index 6bfcdbb..7463cef 100644
--- a/xenstore.c
+++ b/xenstore.c
@@ -472,7 +472,7 @@ void xenstore_parse_domain_config(int hvm_domid)
 #ifdef CONFIG_STUBDOM
         if (pasprintf(&danger_buf, "%s/device/vbd/%s",
danger_path, e_danger[i]) == -1)
             continue;
-	if (bdrv_open2(bs, danger_buf, 0 /* snapshot */, &bdrv_vbd) == 0) {
+	if (bdrv_open2(bs, danger_buf, BDRV_O_CACHE_WB | BDRV_O_RDONLY/* snapshot and
write-back */, &bdrv_vbd) == 0) {
 	    pstrcpy(bs->filename, sizeof(bs->filename), params);
 	} else
 #endif
@@ -498,7 +498,7 @@ void xenstore_parse_domain_config(int hvm_domid)
 		}
 	    }
             pstrcpy(bs->filename, sizeof(bs->filename), params);
-            if (bdrv_open2(bs, params, 0 /* snapshot */, format) < 0)
+            if (bdrv_open2(bs, params, BDRV_O_CACHE_WB | BDRV_O_RDONLY/*
snapshot and write-back */, format) < 0)
                 fprintf(stderr, "qemu: could not open vbd
''%s'' or hard disk image ''%s'' (drv
''%s'' format ''%s'')\n", buf, params, drv
? drv : "?", format ? format->format_name : "0");
         }
 
-- 
1.6.0.rc1


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