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block: simplify handling of try to merge different sized bitmaps

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We have too much logic to simply check that bitmaps are of the same
size. Let's just define that hbitmap_merge() and
bdrv_dirty_bitmap_merge_internal() require their argument bitmaps be of
same size, this simplifies things.

Let's look through the callers:

For backup_init_bcs_bitmap() we already assert that merge can't fail.

In bdrv_reclaim_dirty_bitmap_locked() we gracefully handle the error
that can't happen: successor always has same size as its parent, drop
this logic.

In bdrv_merge_dirty_bitmap() we already has assertion and separate
check. Make the check explicit and improve error message.

Signed-off-by: Vladimir Sementsov-Ogievskiy <v.sementsov-og@mail.ru>
Reviewed-by: Nikita Lapshin <nikita.lapshin@virtuozzo.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20220517111206.23585-4-v.sementsov-og@mail.ru>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2022-05-17 14:12:06 +03:00 • committed by Kevin Wolf
parent 58cbfbdf73
commit 618af89e55
5 changed files with 23 additions and 51 deletions
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15
include/qemu/hbitmap.h
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@ -76,20 +76,9 @@ void hbitmap_truncate(HBitmap *hb, uint64_t size);
*
* Store result of merging @a and @b into @result.
* @result is allowed to be equal to @a or @b.
*
* Return true if the merge was successful,
* false if it was not attempted.
* All bitmaps must have same size.
*/
bool hbitmap_merge(const HBitmap *a, const HBitmap *b, HBitmap *result);
/**
* hbitmap_can_merge:
*
* hbitmap_can_merge(a, b) && hbitmap_can_merge(a, result) is sufficient and
* necessary for hbitmap_merge will not fail.
*
*/
bool hbitmap_can_merge(const HBitmap *a, const HBitmap *b);
void hbitmap_merge(const HBitmap *a, const HBitmap *b, HBitmap *result);
/**
* hbitmap_empty: