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

["Zhang, Yang" <yang.zhang@xxxxxxxxx>]

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

0001--using-write-back-as-the-default-cache-mode.patch
Description: 0001--using-write-back-as-the-default-cache-mode.patch

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