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| author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2019-08-06 18:26:11 +0300 |
|---|---|---|
| committer | John Snow <jsnow@redhat.com> | 2019-10-17 17:02:32 -0400 |
| commit | 48557b138383aaf69c2617ca9a88bfb394fc50ec (patch) | |
| tree | 7344a7f905f1fd6d10ae34efe8e43335032f519b /tests/test-hbitmap.c | |
| parent | f22f553efffd083ff624be116726f843a39f1148 (diff) | |
| download | qemu-48557b138383aaf69c2617ca9a88bfb394fc50ec.zip qemu-48557b138383aaf69c2617ca9a88bfb394fc50ec.tar.gz qemu-48557b138383aaf69c2617ca9a88bfb394fc50ec.tar.bz2 | |
util/hbitmap: strict hbitmap_reset
hbitmap_reset has an unobvious property: it rounds requested region up.
It may provoke bugs, like in recently fixed write-blocking mode of
mirror: user calls reset on unaligned region, not keeping in mind that
there are possible unrelated dirty bytes, covered by rounded-up region
and information of this unrelated "dirtiness" will be lost.
Make hbitmap_reset strict: assert that arguments are aligned, allowing
only one exception when @start + @count == hb->orig_size. It's needed
to comfort users of hbitmap_next_dirty_area, which cares about
hb->orig_size.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20190806152611.280389-1-vsementsov@virtuozzo.com>
[Maintainer edit: Max's suggestions from on-list. --js]
[Maintainer edit: Eric's suggestion for aligned macro. --js]
Signed-off-by: John Snow <jsnow@redhat.com>
Diffstat (limited to 'tests/test-hbitmap.c')
| -rw-r--r-- | tests/test-hbitmap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tests/test-hbitmap.c b/tests/test-hbitmap.c index eed5d28..e1f8670 100644 --- a/tests/test-hbitmap.c +++ b/tests/test-hbitmap.c @@ -423,7 +423,7 @@ static void test_hbitmap_granularity(TestHBitmapData *data, hbitmap_test_check(data, 0); hbitmap_test_set(data, 0, 3); g_assert_cmpint(hbitmap_count(data->hb), ==, 4); - hbitmap_test_reset(data, 0, 1); + hbitmap_test_reset(data, 0, 2); g_assert_cmpint(hbitmap_count(data->hb), ==, 2); } |