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block/dirty-bitmap: add _next_dirty API

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We have bdrv_dirty_bitmap_next_zero, let's add corresponding
bdrv_dirty_bitmap_next_dirty, which is more comfortable to use than
bitmap iterators in some cases.

For test modify test_hbitmap_next_zero_check_range to check both
next_zero and next_dirty and add some new checks.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20200205112041.6003-7-vsementsov@virtuozzo.com
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2020-02-05 14:20:37 +03:00 • committed by John Snow
parent 642700fda0
commit 9399c54b75
5 changed files with 126 additions and 85 deletions
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13
include/qemu/hbitmap.h
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@ -297,6 +297,19 @@ void hbitmap_free(HBitmap *hb);
*/
void hbitmap_iter_init(HBitmapIter *hbi, const HBitmap *hb, uint64_t first);
/*
* hbitmap_next_dirty:
*
* Find next dirty bit within selected range. If not found, return -1.
*
* @hb: The HBitmap to operate on
* @start: The bit to start from.
* @count: Number of bits to proceed. If @start+@count > bitmap size, the whole
* bitmap is looked through. You can use INT64_MAX as @count to search up to
* the bitmap end.
*/
int64_t hbitmap_next_dirty(const HBitmap *hb, int64_t start, int64_t count);
/* hbitmap_next_zero:
*
* Find next not dirty bit within selected range. If not found, return -1.