[Xen-changelog] [xen-unstable] stubdom: fix read-only disks access

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1217844437 -3600
# Node ID 6c1eb35869fd199317b9337c34d1541429f06536
# Parent  9109c9dfbc2e28440c300ed180710393639b8801
stubdom: fix read-only disks access

There is no need for a flush on read-only disks.  It would actually
even error out and disturb the guest.

Signed-off-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxxx>
---
 tools/ioemu/block-vbd.c |    4 ++++
 1 files changed, 4 insertions(+)

diff -r 9109c9dfbc2e -r 6c1eb35869fd tools/ioemu/block-vbd.c
--- a/tools/ioemu/block-vbd.c   Mon Aug 04 11:06:31 2008 +0100
+++ b/tools/ioemu/block-vbd.c   Mon Aug 04 11:07:17 2008 +0100
@@ -273,6 +273,10 @@ static BlockDriverAIOCB *vbd_aio_flush(B
     BDRVVbdState *s = bs->opaque;
     VbdAIOCB *acb = NULL;
 
+    if (s->info.mode == O_RDONLY) {
+        cb(opaque, 0);
+        return NULL;
+    }
     if (s->info.barrier == 1) {
         acb = vbd_aio_setup(bs, 0, NULL, 0,
                 s->info.flush == 1 ? vbd_nop_cb : cb, opaque);

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