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dirty-bitmap: add bdrv_dirty_bitmap_next_dirty_area

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The function alters bdrv_dirty_iter_next_area(), which is wrong and
less efficient (see further commit
"block/mirror: fix and improve do_sync_target_write" for description).

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2019-01-15 18:26:50 -05:00 • committed by John Snow
parent fa9c2da294
commit a78a1a48cd
4 changed files with 63 additions and 0 deletions
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16
include/qemu/hbitmap.h
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@ -311,6 +311,22 @@ unsigned long hbitmap_iter_skip_words(HBitmapIter *hbi);
*/
int64_t hbitmap_next_zero(const HBitmap *hb, uint64_t start, uint64_t count);
/* hbitmap_next_dirty_area:
* @hb: The HBitmap to operate on
* @start: in-out parameter.
* in: the offset to start from
* out: (if area found) start of found area
* @count: in-out parameter.
* in: length of requested region
* out: length of found area
*
* If dirty area found within [@start, @start + @count), returns true and sets
* @offset and @bytes appropriately. Otherwise returns false and leaves @offset
* and @bytes unchanged.
*/
bool hbitmap_next_dirty_area(const HBitmap *hb, uint64_t *start,
uint64_t *count);
/* hbitmap_create_meta:
* Create a "meta" hbitmap to track dirtiness of the bits in this HBitmap.
* The caller owns the created bitmap and must call hbitmap_free_meta(hb) to