block/dirty-bitmap: return int from bdrv_remove_persistent_dirty_bitmap

It's more comfortable to not deal with local_err.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20190920082543.23444-3-vsementsov@virtuozzo.com
Signed-off-by: John Snow <jsnow@redhat.com>

block/dirty-bitmap.c

@@ -455,13 +455,14 @@ void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs)
  * not fail.
  * This function doesn't release corresponding BdrvDirtyBitmap.
  */
-void bdrv_remove_persistent_dirty_bitmap(BlockDriverState *bs,
+int bdrv_remove_persistent_dirty_bitmap(BlockDriverState *bs, const char *name,
-                                         const char *name,
+                                        Error **errp)
-                                         Error **errp)
 {
     if (bs->drv && bs->drv->bdrv_remove_persistent_dirty_bitmap) {
-        bs->drv->bdrv_remove_persistent_dirty_bitmap(bs, name, errp);
+        return bs->drv->bdrv_remove_persistent_dirty_bitmap(bs, name, errp);
     }
+
+    return 0;
 }
 
 bool bdrv_can_store_new_dirty_bitmap(BlockDriverState *bs, const char *name,

block/qcow2-bitmap.c

@@ -1404,9 +1404,8 @@ static Qcow2Bitmap *find_bitmap_by_name(Qcow2BitmapList *bm_list,
     return NULL;
 }
 
-void qcow2_remove_persistent_dirty_bitmap(BlockDriverState *bs,
+int qcow2_remove_persistent_dirty_bitmap(BlockDriverState *bs, const char *name,
-                                          const char *name,
+                                         Error **errp)
-                                          Error **errp)
 {
     int ret;
     BDRVQcow2State *s = bs->opaque;
@@ -1416,18 +1415,19 @@ void qcow2_remove_persistent_dirty_bitmap(BlockDriverState *bs,
     if (s->nb_bitmaps == 0) {
         /* Absence of the bitmap is not an error: see explanation above
          * bdrv_remove_persistent_dirty_bitmap() definition. */
-        return;
+        return 0;
     }
 
     bm_list = bitmap_list_load(bs, s->bitmap_directory_offset,
                                s->bitmap_directory_size, errp);
     if (bm_list == NULL) {
-        return;
+        return -EIO;
     }
 
     bm = find_bitmap_by_name(bm_list, name);
     if (bm == NULL) {
-        goto fail;
+        ret = -EINVAL;
+        goto out;
     }
 
     QSIMPLEQ_REMOVE(bm_list, bm, Qcow2Bitmap, entry);
@@ -1435,14 +1435,16 @@ void qcow2_remove_persistent_dirty_bitmap(BlockDriverState *bs,
     ret = update_ext_header_and_dir(bs, bm_list);
     if (ret < 0) {
         error_setg_errno(errp, -ret, "Failed to update bitmap extension");
-        goto fail;
+        goto out;
     }
 
     free_bitmap_clusters(bs, &bm->table);
 
-fail:
+out:
     bitmap_free(bm);
     bitmap_list_free(bm_list);
+
+    return ret;
 }
 
 void qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs, Error **errp)

block/qcow2.h

@@ -750,9 +750,8 @@ bool qcow2_can_store_new_dirty_bitmap(BlockDriverState *bs,
                                       const char *name,
                                       uint32_t granularity,
                                       Error **errp);
-void qcow2_remove_persistent_dirty_bitmap(BlockDriverState *bs,
+int qcow2_remove_persistent_dirty_bitmap(BlockDriverState *bs, const char *name,
-                                          const char *name,
+                                         Error **errp);
-                                          Error **errp);
 
 ssize_t coroutine_fn
 qcow2_co_compress(BlockDriverState *bs, void *dest, size_t dest_size,

blockdev.c

@@ -2940,15 +2940,14 @@ static BdrvDirtyBitmap *do_block_dirty_bitmap_remove(
     }
 
     if (bdrv_dirty_bitmap_get_persistence(bitmap)) {
+        int ret;
         AioContext *aio_context = bdrv_get_aio_context(bs);
-        Error *local_err = NULL;
 
         aio_context_acquire(aio_context);
-        bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err);
+        ret = bdrv_remove_persistent_dirty_bitmap(bs, name, errp);
         aio_context_release(aio_context);
 
-        if (local_err != NULL) {
+        if (ret < 0) {
-            error_propagate(errp, local_err);
             return NULL;
         }
     }

include/block/block_int.h

@@ -557,9 +557,9 @@ struct BlockDriver {
                                             const char *name,
                                             uint32_t granularity,
                                             Error **errp);
-    void (*bdrv_remove_persistent_dirty_bitmap)(BlockDriverState *bs,
+    int (*bdrv_remove_persistent_dirty_bitmap)(BlockDriverState *bs,
-                                                const char *name,
+                                               const char *name,
-                                                Error **errp);
+                                               Error **errp);
 
     /**
      * Register/unregister a buffer for I/O. For example, when the driver is

include/block/dirty-bitmap.h

@@ -37,9 +37,8 @@ int bdrv_dirty_bitmap_check(const BdrvDirtyBitmap *bitmap, uint32_t flags,
                             Error **errp);
 void bdrv_release_dirty_bitmap(BlockDriverState *bs, BdrvDirtyBitmap *bitmap);
 void bdrv_release_named_dirty_bitmaps(BlockDriverState *bs);
-void bdrv_remove_persistent_dirty_bitmap(BlockDriverState *bs,
+int bdrv_remove_persistent_dirty_bitmap(BlockDriverState *bs, const char *name,
-                                         const char *name,
+                                        Error **errp);
-                                         Error **errp);
 void bdrv_disable_dirty_bitmap(BdrvDirtyBitmap *bitmap);
 void bdrv_enable_dirty_bitmap(BdrvDirtyBitmap *bitmap);
 void bdrv_enable_dirty_bitmap_locked(BdrvDirtyBitmap *bitmap);