Blame SOURCES/kvm-xen_disk-simplify-blk_disconnect-with-refcnt.patch

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From e81a83acac1f44ade1e28879203ca95466dad805 Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Fri, 17 Jan 2014 03:07:50 +0100
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Subject: [PATCH 07/34] xen_disk: simplify blk_disconnect with refcnt
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <1389928083-8921-6-git-send-email-famz@redhat.com>
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Patchwork-id: 56767
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O-Subject: [RHEL-7 qemu-kvm PATCH 05/18] xen_disk: simplify blk_disconnect with refcnt
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Bugzilla: 1041301
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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We call bdrv_attach_dev when initializing whether or not bs is created
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locally, so call bdrv_detach_dev and let the refcnt handle the
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lifecycle.
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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(cherry picked from commit c0777fe18b08c3a6de0c53325d6b9b75ebb9de9a)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Conflicts:
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	hw/block/xen_disk.c
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Contextual conflict because of backport of 4f8a066b.
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Signed-off-by: Fam Zheng <famz@redhat.com>
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---
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 hw/block/xen_disk.c | 11 +++++------
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 1 file changed, 5 insertions(+), 6 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 hw/block/xen_disk.c |   11 +++++------
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 1 files changed, 5 insertions(+), 6 deletions(-)
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diff --git a/hw/block/xen_disk.c b/hw/block/xen_disk.c
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index 138ab94..a2653b2 100644
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--- a/hw/block/xen_disk.c
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+++ b/hw/block/xen_disk.c
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@@ -822,6 +822,9 @@ static int blk_connect(struct XenDevice *xendev)
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             blkdev->bs = NULL;
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             return -1;
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         }
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+        /* blkdev->bs is not create by us, we get a reference
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+         * so we can bdrv_unref() unconditionally */
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+        bdrv_ref(blkdev->bs);
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     }
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     bdrv_attach_dev_nofail(blkdev->bs, blkdev);
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     blkdev->file_size = bdrv_getlength(blkdev->bs);
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@@ -920,12 +923,8 @@ static void blk_disconnect(struct XenDevice *xendev)
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     struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev);
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     if (blkdev->bs) {
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-        if (!blkdev->dinfo) {
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-            /* close/delete only if we created it ourself */
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-            bdrv_close(blkdev->bs);
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-            bdrv_detach_dev(blkdev->bs, blkdev);
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-            bdrv_unref(blkdev->bs);
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-        }
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+        bdrv_detach_dev(blkdev->bs, blkdev);
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+        bdrv_unref(blkdev->bs);
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         blkdev->bs = NULL;
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     }
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     xen_be_unbind_evtchn(&blkdev->xendev);
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-- 
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1.7.1
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