1 files changed, 17 insertions, 34 deletions

diff --git a/block/io.c b/block/io.c
index 916464f..a2389bb 100644
--- a/block/io.c
+++ b/block/io.c
@@ -2255,36 +2255,6 @@ typedef struct BdrvCoBlockStatusData {
     BlockDriverState **file;
 } BdrvCoBlockStatusData;
 
-int coroutine_fn bdrv_co_block_status_from_file(BlockDriverState *bs,
-                                                bool want_zero,
-                                                int64_t offset,
-                                                int64_t bytes,
-                                                int64_t *pnum,
-                                                int64_t *map,
-                                                BlockDriverState **file)
-{
-    assert(bs->file && bs->file->bs);
-    *pnum = bytes;
-    *map = offset;
-    *file = bs->file->bs;
-    return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
-}
-
-int coroutine_fn bdrv_co_block_status_from_backing(BlockDriverState *bs,
-                                                   bool want_zero,
-                                                   int64_t offset,
-                                                   int64_t bytes,
-                                                   int64_t *pnum,
-                                                   int64_t *map,
-                                                   BlockDriverState **file)
-{
-    assert(bs->backing && bs->backing->bs);
-    *pnum = bytes;
-    *map = offset;
-    *file = bs->backing->bs;
-    return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
-}
-
 /*
  * Returns the allocation status of the specified sectors.
  * Drivers not implementing the functionality are assumed to not support
@@ -2325,6 +2295,7 @@ static int coroutine_fn bdrv_co_block_status(BlockDriverState *bs,
     BlockDriverState *local_file = NULL;
     int64_t aligned_offset, aligned_bytes;
     uint32_t align;
+    bool has_filtered_child;
 
     assert(pnum);
     *pnum = 0;
@@ -2350,7 +2321,8 @@ static int coroutine_fn bdrv_co_block_status(BlockDriverState *bs,
 
     /* Must be non-NULL or bdrv_getlength() would have failed */
     assert(bs->drv);
-    if (!bs->drv->bdrv_co_block_status) {
+    has_filtered_child = bdrv_filter_child(bs);
+    if (!bs->drv->bdrv_co_block_status && !has_filtered_child) {
         *pnum = bytes;
         ret = BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED;
         if (offset + bytes == total_size) {
@@ -2371,9 +2343,20 @@ static int coroutine_fn bdrv_co_block_status(BlockDriverState *bs,
     aligned_offset = QEMU_ALIGN_DOWN(offset, align);
     aligned_bytes = ROUND_UP(offset + bytes, align) - aligned_offset;
 
-    ret = bs->drv->bdrv_co_block_status(bs, want_zero, aligned_offset,
-                                        aligned_bytes, pnum, &local_map,
-                                        &local_file);
+    if (bs->drv->bdrv_co_block_status) {
+        ret = bs->drv->bdrv_co_block_status(bs, want_zero, aligned_offset,
+                                            aligned_bytes, pnum, &local_map,
+                                            &local_file);
+    } else {
+        /* Default code for filters */
+
+        local_file = bdrv_filter_bs(bs);
+        assert(local_file);
+
+        *pnum = aligned_bytes;
+        local_map = aligned_offset;
+        ret = BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID;
+    }
     if (ret < 0) {
         *pnum = 0;
         goto out;