[PATCH 03/11] block/block-copy: block_copy_state_new(): add bitmap parameter

[Vladimir Sementsov-Ogievskiy]

This will be used in the following commit to bring "incremental" mode
to copy-before-write filter.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 include/block/block-copy.h |  2 +-
 block/block-copy.c         | 16 +++++++++++++---
 block/copy-before-write.c  |  3 ++-
 3 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/include/block/block-copy.h b/include/block/block-copy.h
index 9c24e8f38e..7d40bf2ac2 100644
--- a/include/block/block-copy.h
+++ b/include/block/block-copy.h
@@ -26,7 +26,7 @@ typedef struct BlockCopyCallState BlockCopyCallState;
 
 BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
                                      bool use_copy_range, bool compress,
-                                     Error **errp);
+                                     BdrvDirtyBitmap *bitmap, Error **errp);
 
 void block_copy_set_copy_opts(BlockCopyState *s, bool use_copy_range,
                               bool compress);
diff --git a/block/block-copy.c b/block/block-copy.c
index 307045a59f..ec6a39b2ed 100644
--- a/block/block-copy.c
+++ b/block/block-copy.c
@@ -400,9 +400,10 @@ static int64_t 
block_copy_calculate_cluster_size(BlockDriverState *target,
 }
 
 BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
-                                     bool use_copy_range,
-                                     bool compress, Error **errp)
+                                     bool use_copy_range, bool compress,
+                                     BdrvDirtyBitmap *bitmap, Error **errp)
 {
+    ERRP_GUARD();
     BlockCopyState *s;
     int64_t cluster_size;
     BdrvDirtyBitmap *copy_bitmap;
@@ -418,7 +419,16 @@ BlockCopyState *block_copy_state_new(BdrvChild *source, 
BdrvChild *target,
         return NULL;
     }
     bdrv_disable_dirty_bitmap(copy_bitmap);
-    bdrv_set_dirty_bitmap(copy_bitmap, 0, bdrv_dirty_bitmap_size(copy_bitmap));
+    if (bitmap) {
+        if (!bdrv_merge_dirty_bitmap(copy_bitmap, bitmap, NULL, errp)) {
+            error_prepend(errp, "Failed to merge bitmap '%s' to internal "
+                          "copy-bitmap: ", bdrv_dirty_bitmap_name(bitmap));
+            return NULL;
+        }
+    } else {
+        bdrv_set_dirty_bitmap(copy_bitmap, 0,
+                              bdrv_dirty_bitmap_size(copy_bitmap));
+    }
 
     s = g_new(BlockCopyState, 1);
     *s = (BlockCopyState) {
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index b36ede3186..dbafee1f03 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -169,7 +169,8 @@ static int cbw_open(BlockDriverState *bs, QDict *options, 
int flags,
             ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
              bs->file->bs->supported_zero_flags);
 
-    s->bcs = block_copy_state_new(bs->file, s->target, false, false, errp);
+    s->bcs = block_copy_state_new(bs->file, s->target, false, false, NULL,
+                                  errp);
     if (!s->bcs) {
         error_prepend(errp, "Cannot create block-copy-state: ");
         return -EINVAL;
-- 
2.29.2