Revert "qemu-xen-traditional: use O_DIRECT to open disk images for IDE"

This reverts commit 1307e42a4b3c1102d75401bc0cffb4eb6c9b7a38.

In fact after a lengthy discussion, we came up with the conclusion
that WRITEBACK is OK for IDE.
See: http://marc.info/?l=xen-devel&m=133311527009773

Therefore revert this which was committed in error.
(cherry picked from commit effd5676225761abdab90becac519716515c3be4)

diff --git a/xenstore.c b/xenstore.c
index ac90366f0d9463ca407ccb14150edde42a34f725..4c483e29523129f825e7b889555ff88be5952edf 100644 (file)
--- a/xenstore.c
+++ b/xenstore.c
@@ -643,7 +643,7 @@ void xenstore_parse_domain_config(int hvm_domid)
            }
             pstrcpy(bs->filename, sizeof(bs->filename), params);
 
-            flags = BDRV_O_NOCACHE;
+            flags = BDRV_O_CACHE_WB; /* snapshot and write-back */
             is_readonly = 0;
             if (pasprintf(&buf, "%s/mode", bpath) == -1)
                 continue;