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From 33eef488233850a3eeb806bf11d562c86eaacb72 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 03:07:51 +0100
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Subject: [PATCH 08/34] nbd: use BlockDriverState refcnt
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <1389928083-8921-7-git-send-email-famz@redhat.com>
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Patchwork-id: 56768
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O-Subject: [RHEL-7 qemu-kvm PATCH 06/18] nbd: use BlockDriverState 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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Previously, nbd calls drive_get_ref() on the drive of bs. A BDS doesn't
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always have associated dinfo, which nbd doesn't care either. We already
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have BDS ref count, so use it to make it safe for a BDS w/o blockdev.
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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 38b54b6dc18ae7e2a32e5ae38b312fb13f0584c8)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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---
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blockdev-nbd.c | 10 +---------
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nbd.c | 5 +++++
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2 files changed, 6 insertions(+), 9 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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blockdev-nbd.c | 10 +---------
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nbd.c | 5 +++++
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2 files changed, 6 insertions(+), 9 deletions(-)
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diff --git a/blockdev-nbd.c b/blockdev-nbd.c
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index 95f10c8..922cf56 100644
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--- a/blockdev-nbd.c
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+++ b/blockdev-nbd.c
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@@ -69,12 +69,6 @@ static void nbd_close_notifier(Notifier *n, void *data)
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g_free(cn);
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}
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-static void nbd_server_put_ref(NBDExport *exp)
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-{
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- BlockDriverState *bs = nbd_export_get_blockdev(exp);
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- drive_put_ref(drive_get_by_blockdev(bs));
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-}
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-
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void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
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Error **errp)
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{
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@@ -105,11 +99,9 @@ void qmp_nbd_server_add(const char *device, bool has_writable, bool writable,
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writable = false;
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}
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- exp = nbd_export_new(bs, 0, -1, writable ? 0 : NBD_FLAG_READ_ONLY,
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- nbd_server_put_ref);
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+ exp = nbd_export_new(bs, 0, -1, writable ? 0 : NBD_FLAG_READ_ONLY, NULL);
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nbd_export_set_name(exp, device);
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- drive_get_ref(drive_get_by_blockdev(bs));
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n = g_malloc0(sizeof(NBDCloseNotifier));
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n->n.notify = nbd_close_notifier;
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diff --git a/nbd.c b/nbd.c
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index 2606403..f258cdd 100644
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--- a/nbd.c
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+++ b/nbd.c
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@@ -881,6 +881,7 @@ NBDExport *nbd_export_new(BlockDriverState *bs, off_t dev_offset,
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exp->nbdflags = nbdflags;
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exp->size = size == -1 ? bdrv_getlength(bs) : size;
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exp->close = close;
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+ bdrv_ref(bs);
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return exp;
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}
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@@ -927,6 +928,10 @@ void nbd_export_close(NBDExport *exp)
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}
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nbd_export_set_name(exp, NULL);
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nbd_export_put(exp);
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+ if (exp->bs) {
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+ bdrv_unref(exp->bs);
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+ exp->bs = NULL;
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+ }
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}
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void nbd_export_get(NBDExport *exp)
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--
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1.7.1
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