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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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39
util/hbitmap.c
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@ -246,6 +246,45 @@ int64_t hbitmap_next_zero(const HBitmap *hb, uint64_t start, uint64_t count)
return res;
}
bool hbitmap_next_dirty_area(const HBitmap *hb, uint64_t *start,
uint64_t *count)
{
HBitmapIter hbi;
int64_t firt_dirty_off, area_end;
uint32_t granularity = 1UL << hb->granularity;
uint64_t end;
if (*start >= hb->orig_size || *count == 0) {
return false;
}
end = *count > hb->orig_size - *start ? hb->orig_size : *start + *count;
hbitmap_iter_init(&hbi, hb, *start);
firt_dirty_off = hbitmap_iter_next(&hbi, false);
if (firt_dirty_off < 0 || firt_dirty_off >= end) {
return false;
}
if (firt_dirty_off + granularity >= end) {
area_end = end;
} else {
area_end = hbitmap_next_zero(hb, firt_dirty_off + granularity,
end - firt_dirty_off - granularity);
if (area_end < 0) {
area_end = end;
}
}
if (firt_dirty_off > *start) {
*start = firt_dirty_off;
}
*count = area_end - *start;
return true;
}
bool hbitmap_empty(const HBitmap *hb)
{
return hb->count == 0;