block-backend: remove blk_flush_all

We can teach Xen to drain and flush each device as it needs to, instead
of trying to flush ALL devices. This removes the last user of
blk_flush_all.

The function is therefore removed under the premise that any new uses
of blk_flush_all would be the wrong paradigm: either flush the single
device that requires flushing, or use an appropriate flush_all mechanism
from outside of the BlkBackend layer.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/hw/ide/piix.c b/hw/ide/piix.c
index c190fcaa3c..d5777fd0b3 100644
--- a/hw/ide/piix.c
+++ b/hw/ide/piix.c
@@ -179,6 +179,10 @@ int pci_piix3_xen_ide_unplug(DeviceState *dev)
         if (di != NULL && !di->media_cd) {
             BlockBackend *blk = blk_by_legacy_dinfo(di);
             DeviceState *ds = blk_get_attached_dev(blk);
+
+            blk_drain(blk);
+            blk_flush(blk);
+
             if (ds) {
                 blk_detach_dev(blk, ds);
             }