[PATCH 07/11] block/dirty-bitmap: introduce bdrv_dirty_bitmap_status()

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

Add a convenient function similar with bdrv_block_status() to get
status of dirty bitmap.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 include/block/dirty-bitmap.h |  2 ++
 include/qemu/hbitmap.h       | 11 +++++++++++
 block/dirty-bitmap.c         |  6 ++++++
 util/hbitmap.c               | 36 ++++++++++++++++++++++++++++++++++++
 4 files changed, 55 insertions(+)

diff --git a/include/block/dirty-bitmap.h b/include/block/dirty-bitmap.h
index f95d350b70..2ae7dc3d1d 100644
--- a/include/block/dirty-bitmap.h
+++ b/include/block/dirty-bitmap.h
@@ -115,6 +115,8 @@ int64_t bdrv_dirty_bitmap_next_zero(BdrvDirtyBitmap *bitmap, int64_t offset,
 bool bdrv_dirty_bitmap_next_dirty_area(BdrvDirtyBitmap *bitmap,
         int64_t start, int64_t end, int64_t max_dirty_count,
         int64_t *dirty_start, int64_t *dirty_count);
+void bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap, int64_t offset,
+                              int64_t bytes, bool *is_dirty, int64_t *count);
 BdrvDirtyBitmap *bdrv_reclaim_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap,
                                                   Error **errp);
 
diff --git a/include/qemu/hbitmap.h b/include/qemu/hbitmap.h
index 5e71b6d6f7..845fda12db 100644
--- a/include/qemu/hbitmap.h
+++ b/include/qemu/hbitmap.h
@@ -340,6 +340,17 @@ bool hbitmap_next_dirty_area(const HBitmap *hb, int64_t start, int64_t end,
                              int64_t max_dirty_count,
                              int64_t *dirty_start, int64_t *dirty_count);
 
+/*
+ * bdrv_dirty_bitmap_status:
+ * @hb: The HBitmap to operate on
+ * @start: the offset to start from
+ * @end: end of requested area
+ * @is_dirty: is bitmap dirty at @offset
+ * @pnum: how many bits has same value starting from @offset
+ */
+void hbitmap_status(const HBitmap *hb, int64_t offset, int64_t bytes,
+                    bool *is_dirty, int64_t *pnum);
+
 /**
  * hbitmap_iter_next:
  * @hbi: HBitmapIter to operate on.
diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c
index 8f8b428baa..ecbd6703dc 100644
--- a/block/dirty-bitmap.c
+++ b/block/dirty-bitmap.c
@@ -875,6 +875,12 @@ bool bdrv_dirty_bitmap_next_dirty_area(BdrvDirtyBitmap *bitmap,
                                    dirty_start, dirty_count);
 }
 
+void bdrv_dirty_bitmap_status(BdrvDirtyBitmap *bitmap, int64_t offset,
+                              int64_t bytes, bool *is_dirty, int64_t *count)
+{
+    hbitmap_status(bitmap->bitmap, offset, bytes, is_dirty, count);
+}
+
 /**
  * bdrv_merge_dirty_bitmap: merge src into dest.
  * Ensures permissions on bitmaps are reasonable; use for public API.
diff --git a/util/hbitmap.c b/util/hbitmap.c
index 305b894a63..91956263ef 100644
--- a/util/hbitmap.c
+++ b/util/hbitmap.c
@@ -301,6 +301,42 @@ bool hbitmap_next_dirty_area(const HBitmap *hb, int64_t start, int64_t end,
     return true;
 }
 
+void hbitmap_status(const HBitmap *hb, int64_t start, int64_t count,
+                    bool *is_dirty, int64_t *pnum)
+{
+    int64_t next_dirty, next_zero;
+
+    assert(start >= 0);
+    assert(count > 0);
+    assert(start + count <= hb->orig_size);
+
+    next_dirty = hbitmap_next_dirty(hb, start, count);
+    if (next_dirty == -1) {
+        *pnum = count;
+        *is_dirty = false;
+        return;
+    }
+
+    if (next_dirty > start) {
+        *pnum = next_dirty - start;
+        *is_dirty = false;
+        return;
+    }
+
+    assert(next_dirty == start);
+
+    next_zero = hbitmap_next_zero(hb, start, count);
+    if (next_zero == -1) {
+        *pnum = next_zero - start;
+        *is_dirty = true;
+        return;
+    }
+
+    assert(next_zero > start);
+    *pnum = next_zero - start;
+    *is_dirty = false;
+}
+
 bool hbitmap_empty(const HBitmap *hb)
 {
     return hb->count == 0;
-- 
2.29.2