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From 7879107e37dd742ffeff6f943671ae6c49c75876 Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Wed, 18 Jul 2018 22:54:37 +0200
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Subject: [PATCH 219/268] block/dirty-bitmap: add lock to
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bdrv_enable/disable_dirty_bitmap
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20180718225511.14878-2-jsnow@redhat.com>
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Patchwork-id: 81426
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 01/35] block/dirty-bitmap: add lock to bdrv_enable/disable_dirty_bitmap
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Bugzilla: 1207657
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RH-Acked-by: Eric Blake <eblake@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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From: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Add locks and remove comments about BQL accordingly to
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dirty_bitmap_mutex definition in block_int.h.
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Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Signed-off-by: John Snow <jsnow@redhat.com>
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Reviewed-by: Jeff Cody <jcody@redhat.com>
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Message-id: 20180606182449.1607-2-jsnow@redhat.com
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Signed-off-by: John Snow <jsnow@redhat.com>
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(cherry picked from commit 8b1402ce80d74dc02802f101a0f6c340462380d1)
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Signed-off-by: John Snow <jsnow@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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block/dirty-bitmap.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
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index 9671594..5623425 100644
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--- a/block/dirty-bitmap.c
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+++ b/block/dirty-bitmap.c
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@@ -442,18 +442,20 @@ void bdrv_remove_persistent_dirty_bitmap(BlockDriverState *bs,
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}
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}
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-/* Called with BQL taken. */
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void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap)
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{
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+ bdrv_dirty_bitmap_lock(bitmap);
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assert(!bdrv_dirty_bitmap_frozen(bitmap));
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bitmap->disabled = true;
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+ bdrv_dirty_bitmap_unlock(bitmap);
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}
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-/* Called with BQL taken. */
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void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap)
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{
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+ bdrv_dirty_bitmap_lock(bitmap);
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assert(!bdrv_dirty_bitmap_frozen(bitmap));
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bitmap->disabled = false;
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+ bdrv_dirty_bitmap_unlock(bitmap);
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}
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BlockDirtyInfoList *bdrv_query_dirty_bitmaps(BlockDriverState *bs)
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--
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1.8.3.1
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