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From 05a40305eb495ff14c9bfcb1aa94c168b54d79ce 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 22:55:08 +0200
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Subject: [PATCH 83/89] nbd/server: Fix dirty bitmap logic regression
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20180718225511.14878-33-jsnow@redhat.com>
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Patchwork-id: 81427
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 32/35] nbd/server: Fix dirty bitmap logic regression
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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: Eric Blake <eblake@redhat.com>
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In my hurry to fix a build failure, I introduced a logic bug.
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The assertion conditional is backwards, meaning that qemu will
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now abort instead of reporting dirty bitmap status.
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The bug can only be tickled by an NBD client using an exported
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dirty bitmap (which is still an experimental QMP command), so
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it's not the end of the world for supported usage (and neither
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'make check' nor qemu-iotests fails); but it also shows that we
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really want qemu-io support for reading dirty bitmaps if only
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so that I can add iotests coverage to prevent future
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brown-bag-of-shame events like this one.
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Fixes: 45eb6fb6
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Signed-off-by: Eric Blake <eblake@redhat.com>
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Message-Id: <20180622153509.375130-1-eblake@redhat.com>
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(cherry picked from commit 7606c99a0421be7e9d984766fe239f7791a2fd9c)
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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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nbd/server.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/nbd/server.c b/nbd/server.c
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index 50ac8bf..e52b76b 100644
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--- a/nbd/server.c
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+++ b/nbd/server.c
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@@ -1977,7 +1977,7 @@ static unsigned int bitmap_to_extents(BdrvDirtyBitmap *bitmap, uint64_t offset,
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bdrv_dirty_bitmap_unlock(bitmap);
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- assert(offset > end);
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+ assert(offset < end);
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*length = end - offset;
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return i;
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}
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--
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1.8.3.1
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