diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8db66fe57..02ceff000 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -38,6 +38,10 @@ A number of functions have been renamed:
 
 The old names still exist but are deprecated.  They will be removed in the v18.07 release.
 
+spdk_blob_resize() is now an asynchronous operation to enable resizing a blob while I/O
+are in progress to that blob on other threads.  An explicit spdk_blob_sync_md() is still
+required to sync the updated metadata to disk.
+
 ### Lib
 
 A set of changes were made in the SPDK's lib code altering,
diff --git a/examples/blob/cli/blobcli.c b/examples/blob/cli/blobcli.c
index 23511f6b6..be370629a 100644
--- a/examples/blob/cli/blobcli.c
+++ b/examples/blob/cli/blobcli.c
@@ -289,25 +289,13 @@ sync_cb(void *arg1, int bserrno)
 	spdk_blob_close(cli_context->blob, close_cb, cli_context);
 }
 
-/*
- * Callback function for opening a blob after creating.
- */
 static void
-open_now_resize_cb(void *cb_arg, struct spdk_blob *blob, int bserrno)
+resize_cb(void *cb_arg, int bserrno)
 {
 	struct cli_context_t *cli_context = cb_arg;
-	int rc = 0;
 	uint64_t total = 0;
 
 	if (bserrno) {
-		unload_bs(cli_context, "Error in open completion",
-			  bserrno);
-		return;
-	}
-	cli_context->blob = blob;
-
-	rc = spdk_blob_resize(cli_context->blob, cli_context->num_clusters);
-	if (rc) {
 		unload_bs(cli_context, "Error in blob resize",
 			  bserrno);
 		return;
@@ -324,6 +312,25 @@ open_now_resize_cb(void *cb_arg, struct spdk_blob *blob, int bserrno)
 	spdk_blob_sync_md(cli_context->blob, sync_cb, cli_context);
 }
 
+/*
+ * Callback function for opening a blob after creating.
+ */
+static void
+open_now_resize_cb(void *cb_arg, struct spdk_blob *blob, int bserrno)
+{
+	struct cli_context_t *cli_context = cb_arg;
+
+	if (bserrno) {
+		unload_bs(cli_context, "Error in open completion",
+			  bserrno);
+		return;
+	}
+	cli_context->blob = blob;
+
+	spdk_blob_resize(cli_context->blob, cli_context->num_clusters,
+			 resize_cb, cli_context);
+}
+
 /*
  * Callback function for creating a blob.
  */
diff --git a/examples/blob/hello_world/hello_blob.c b/examples/blob/hello_world/hello_blob.c
index 183459a36..30206f89f 100644
--- a/examples/blob/hello_world/hello_blob.c
+++ b/examples/blob/hello_world/hello_blob.c
@@ -266,6 +266,33 @@ sync_complete(void *arg1, int bserrno)
 	blob_write(hello_context);
 }
 
+static void
+resize_complete(void *cb_arg, int bserrno)
+{
+	struct hello_context_t *hello_context = cb_arg;
+	uint64_t total = 0;
+
+	if (bserrno) {
+		unload_bs(hello_context, "Error in blob resize", bserrno);
+		return;
+	}
+
+	total = spdk_blob_get_num_clusters(hello_context->blob);
+	SPDK_NOTICELOG("resized blob now has USED clusters of %" PRIu64 "\n",
+		       total);
+
+	/*
+	 * Metadata is stored in volatile memory for performance
+	 * reasons and therefore needs to be synchronized with
+	 * non-volatile storage to make it persistent. This can be
+	 * done manually, as shown here, or if not it will be done
+	 * automatically when the blob is closed. It is always a
+	 * good idea to sync after making metadata changes unless
+	 * it has an unacceptable impact on application performance.
+	 */
+	spdk_blob_sync_md(hello_context->blob, sync_complete, hello_context);
+}
+
 /*
  * Callback function for opening a blob.
  */
@@ -274,8 +301,6 @@ open_complete(void *cb_arg, struct spdk_blob *blob, int bserrno)
 {
 	struct hello_context_t *hello_context = cb_arg;
 	uint64_t free = 0;
-	uint64_t total = 0;
-	int rc = 0;
 
 	SPDK_NOTICELOG("entry\n");
 	if (bserrno) {
@@ -297,27 +322,7 @@ open_complete(void *cb_arg, struct spdk_blob *blob, int bserrno)
 	 * there'd usually be many blobs of various sizes. The resize
 	 * unit is a cluster.
 	 */
-	rc = spdk_blob_resize(hello_context->blob, free);
-	if (rc) {
-		unload_bs(hello_context, "Error in blob resize",
-			  bserrno);
-		return;
-	}
-
-	total = spdk_blob_get_num_clusters(hello_context->blob);
-	SPDK_NOTICELOG("resized blob now has USED clusters of %" PRIu64 "\n",
-		       total);
-
-	/*
-	 * Metadata is stored in volatile memory for performance
-	 * reasons and therefore needs to be synchronized with
-	 * non-volatile storage to make it persistent. This can be
-	 * done manually, as shown here, or if not it will be done
-	 * automatically when the blob is closed. It is always a
-	 * good idea to sync after making metadata changes unless
-	 * it has an unacceptable impact on application performance.
-	 */
-	spdk_blob_sync_md(hello_context->blob, sync_complete, hello_context);
+	spdk_blob_resize(hello_context->blob, free, resize_complete, hello_context);
 }
 
 /*
diff --git a/include/spdk/blob.h b/include/spdk/blob.h
index 415a8381e..6cc1c451a 100644
--- a/include/spdk/blob.h
+++ b/include/spdk/blob.h
@@ -383,10 +383,11 @@ void spdk_bs_open_blob(struct spdk_blob_store *bs, spdk_blob_id blobid,
  *
  * \param blob Blob to resize.
  * \param sz The new number of clusters.
+ * \param cb_fn Called when the operation is complete.
+ * \param cb_arg Argument passed to function cb_fn.
  *
- * \return 0 on success, negative errno on failure.
  */
-int spdk_blob_resize(struct spdk_blob *blob, size_t sz);
+void spdk_blob_resize(struct spdk_blob *blob, size_t sz, spdk_blob_op_complete cb_fn, void *cb_arg);
 
 /**
  * Set blob as read only.
diff --git a/include/spdk_internal/lvolstore.h b/include/spdk_internal/lvolstore.h
index 1dd5d93fc..ab261304e 100644
--- a/include/spdk_internal/lvolstore.h
+++ b/include/spdk_internal/lvolstore.h
@@ -53,6 +53,8 @@ struct spdk_lvol_req {
 	spdk_lvol_op_complete   cb_fn;
 	void                    *cb_arg;
 	struct spdk_lvol	*lvol;
+	size_t			sz;
+	struct spdk_bdev	*bdev;
 	char			name[SPDK_LVOL_NAME_MAX];
 };
 
@@ -117,7 +119,7 @@ struct lvol_task {
 struct lvol_store_bdev *vbdev_lvol_store_first(void);
 struct lvol_store_bdev *vbdev_lvol_store_next(struct lvol_store_bdev *prev);
 
-int spdk_lvol_resize(struct spdk_lvol *lvol, uint64_t sz, spdk_lvol_op_complete cb_fn,
-		     void *cb_arg);
+void spdk_lvol_resize(struct spdk_lvol *lvol, uint64_t sz, spdk_lvol_op_complete cb_fn,
+		      void *cb_arg);
 
 #endif /* SPDK_INTERNAL_LVOLSTORE_H */
diff --git a/lib/bdev/lvol/vbdev_lvol.c b/lib/bdev/lvol/vbdev_lvol.c
index 5a98fd776..cd45f8f8e 100644
--- a/lib/bdev/lvol/vbdev_lvol.c
+++ b/lib/bdev/lvol/vbdev_lvol.c
@@ -929,6 +929,16 @@ static void
 _vbdev_lvol_resize_cb(void *cb_arg, int lvolerrno)
 {
 	struct spdk_lvol_req *req = cb_arg;
+	uint64_t cluster_size;
+	int rc;
+
+	if (lvolerrno == 0) {
+		cluster_size = spdk_bs_get_cluster_size(req->lvol->lvol_store->blobstore);
+		rc = spdk_bdev_notify_blockcnt_change(req->bdev, req->sz * cluster_size / req->bdev->blocklen);
+		if (rc != 0) {
+			SPDK_ERRLOG("Could not change num blocks for bdev_lvol.\n");
+		}
+	}
 
 	req->cb_fn(req->cb_arg,  lvolerrno);
 	free(req);
@@ -941,9 +951,6 @@ vbdev_lvol_resize(char *name, size_t sz,
 	struct spdk_lvol_req *req;
 	struct spdk_bdev *bdev;
 	struct spdk_lvol *lvol;
-	struct spdk_lvol_store *lvs;
-	uint64_t cluster_size;
-	int rc;
 
 	lvol = vbdev_get_lvol_by_unique_id(name);
 	if (lvol == NULL) {
@@ -957,9 +964,6 @@ vbdev_lvol_resize(char *name, size_t sz,
 		return -ENODEV;
 	}
 
-	lvs = lvol->lvol_store;
-	cluster_size = spdk_bs_get_cluster_size(lvs->blobstore);
-
 	req = calloc(1, sizeof(*req));
 	if (req == NULL) {
 		cb_fn(cb_arg, -1);
@@ -967,17 +971,12 @@ vbdev_lvol_resize(char *name, size_t sz,
 	}
 	req->cb_fn = cb_fn;
 	req->cb_arg = cb_arg;
+	req->sz = sz;
+	req->bdev = bdev;
+	req->lvol = lvol;
 
-	rc = spdk_lvol_resize(lvol, sz, _vbdev_lvol_resize_cb, req);
-
-	if (rc == 0) {
-		rc = spdk_bdev_notify_blockcnt_change(bdev, sz * cluster_size / bdev->blocklen);
-		if (rc != 0) {
-			SPDK_ERRLOG("Could not change num blocks for bdev_lvol.\n");
-		}
-	}
-
-	return rc;
+	spdk_lvol_resize(lvol, sz, _vbdev_lvol_resize_cb, req);
+	return 0;
 }
 
 static int
diff --git a/lib/blob/blobstore.c b/lib/blob/blobstore.c
index b3917a5c7..0cdc944a7 100644
--- a/lib/blob/blobstore.c
+++ b/lib/blob/blobstore.c
@@ -3574,8 +3574,8 @@ void spdk_bs_create_blob_ext(struct spdk_blob_store *bs, const struct spdk_blob_
 /* END spdk_bs_create_blob */
 
 /* START spdk_blob_resize */
-int
-spdk_blob_resize(struct spdk_blob *blob, uint64_t sz)
+void
+spdk_blob_resize(struct spdk_blob *blob, uint64_t sz, spdk_blob_op_complete cb_fn, void *cb_arg)
 {
 	int			rc;
 
@@ -3584,19 +3584,17 @@ spdk_blob_resize(struct spdk_blob *blob, uint64_t sz)
 	SPDK_DEBUGLOG(SPDK_LOG_BLOB, "Resizing blob %lu to %lu clusters\n", blob->id, sz);
 
 	if (blob->md_ro) {
-		return -EPERM;
+		cb_fn(cb_arg, -EPERM);
+		return;
 	}
 
 	if (sz == blob->active.num_clusters) {
-		return 0;
+		cb_fn(cb_arg, 0);
+		return;
 	}
 
 	rc = _spdk_blob_resize(blob, sz);
-	if (rc < 0) {
-		return rc;
-	}
-
-	return 0;
+	cb_fn(cb_arg, rc);
 }
 
 /* END spdk_blob_resize */
diff --git a/lib/blobfs/blobfs.c b/lib/blobfs/blobfs.c
index d90a5ff37..e1169498e 100644
--- a/lib/blobfs/blobfs.c
+++ b/lib/blobfs/blobfs.c
@@ -188,7 +188,8 @@ struct spdk_fs_cb_args {
 			TAILQ_ENTRY(spdk_fs_request)	tailq;
 		} open;
 		struct {
-			const char	*name;
+			const char		*name;
+			struct spdk_blob	*blob;
 		} create;
 		struct {
 			const char	*name;
@@ -858,20 +859,30 @@ fs_create_blob_close_cb(void *ctx, int bserrno)
 }
 
 static void
-fs_create_blob_open_cb(void *ctx, struct spdk_blob *blob, int bserrno)
+fs_create_blob_resize_cb(void *ctx, int bserrno)
 {
 	struct spdk_fs_request *req = ctx;
 	struct spdk_fs_cb_args *args = &req->args;
 	struct spdk_file *f = args->file;
+	struct spdk_blob *blob = args->op.create.blob;
 	uint64_t length = 0;
 
-	spdk_blob_resize(blob, 1);
 	spdk_blob_set_xattr(blob, "name", f->name, strlen(f->name) + 1);
 	spdk_blob_set_xattr(blob, "length", &length, sizeof(length));
 
 	spdk_blob_close(blob, fs_create_blob_close_cb, args);
 }
 
+static void
+fs_create_blob_open_cb(void *ctx, struct spdk_blob *blob, int bserrno)
+{
+	struct spdk_fs_request *req = ctx;
+	struct spdk_fs_cb_args *args = &req->args;
+
+	args->op.create.blob = blob;
+	spdk_blob_resize(blob, 1, fs_create_blob_resize_cb, req);
+}
+
 static void
 fs_create_blob_create_cb(void *ctx, spdk_blob_id blobid, int bserrno)
 {
@@ -1404,6 +1415,24 @@ fs_truncate_complete_cb(void *ctx, int bserrno)
 	free_fs_request(req);
 }
 
+static void
+fs_truncate_resize_cb(void *ctx, int bserrno)
+{
+	struct spdk_fs_request *req = ctx;
+	struct spdk_fs_cb_args *args = &req->args;
+	struct spdk_file *file = args->file;
+	uint64_t *length = &args->op.truncate.length;
+
+	spdk_blob_set_xattr(file->blob, "length", length, sizeof(*length));
+
+	file->length = *length;
+	if (file->append_pos > file->length) {
+		file->append_pos = file->length;
+	}
+
+	spdk_blob_sync_md(file->blob, fs_truncate_complete_cb, args);
+}
+
 static uint64_t
 __bytes_to_clusters(uint64_t length, uint64_t cluster_sz)
 {
@@ -1435,19 +1464,12 @@ spdk_file_truncate_async(struct spdk_file *file, uint64_t length,
 	args->fn.file_op = cb_fn;
 	args->arg = cb_arg;
 	args->file = file;
+	args->op.truncate.length = length;
 	fs = file->fs;
 
 	num_clusters = __bytes_to_clusters(length, fs->bs_opts.cluster_sz);
 
-	spdk_blob_resize(file->blob, num_clusters);
-	spdk_blob_set_xattr(file->blob, "length", &length, sizeof(length));
-
-	file->length = length;
-	if (file->append_pos > file->length) {
-		file->append_pos = file->length;
-	}
-
-	spdk_blob_sync_md(file->blob, fs_truncate_complete_cb, args);
+	spdk_blob_resize(file->blob, num_clusters, fs_truncate_resize_cb, req);
 }
 
 static void
@@ -1940,15 +1962,22 @@ __file_extend_done(void *arg, int bserrno)
 	__wake_caller(args);
 }
 
+static void
+__file_extend_resize_cb(void *_args, int bserrno)
+{
+	struct spdk_fs_cb_args *args = _args;
+	struct spdk_file *file = args->file;
+
+	spdk_blob_sync_md(file->blob, __file_extend_done, args);
+}
+
 static void
 __file_extend_blob(void *_args)
 {
 	struct spdk_fs_cb_args *args = _args;
 	struct spdk_file *file = args->file;
 
-	spdk_blob_resize(file->blob, args->op.resize.num_clusters);
-
-	spdk_blob_sync_md(file->blob, __file_extend_done, args);
+	spdk_blob_resize(file->blob, args->op.resize.num_clusters, __file_extend_resize_cb, args);
 }
 
 static void
diff --git a/lib/lvol/lvol.c b/lib/lvol/lvol.c
index 6e7f2080c..e30f3a9f3 100644
--- a/lib/lvol/lvol.c
+++ b/lib/lvol/lvol.c
@@ -1088,7 +1088,7 @@ spdk_lvol_create(struct spdk_lvol_store *lvs, const char *name, uint64_t sz,
 }
 
 static void
-_spdk_lvol_resize_cb(void *cb_arg, int lvolerrno)
+_spdk_lvol_resize_done(void *cb_arg, int lvolerrno)
 {
 	struct spdk_lvol_req *req = cb_arg;
 
@@ -1096,11 +1096,25 @@ _spdk_lvol_resize_cb(void *cb_arg, int lvolerrno)
 	free(req);
 }
 
-int
+static void
+_spdk_lvol_blob_resize_cb(void *cb_arg, int bserrno)
+{
+	struct spdk_lvol_req *req = cb_arg;
+	struct spdk_lvol *lvol = req->lvol;
+
+	if (bserrno != 0) {
+		req->cb_fn(req->cb_arg, bserrno);
+		free(req);
+		return;
+	}
+
+	spdk_blob_sync_md(lvol->blob, _spdk_lvol_resize_done, req);
+}
+
+void
 spdk_lvol_resize(struct spdk_lvol *lvol, uint64_t sz,
 		 spdk_lvol_op_complete cb_fn, void *cb_arg)
 {
-	int rc;
 	struct spdk_blob *blob = lvol->blob;
 	struct spdk_lvol_store *lvs = lvol->lvol_store;
 	struct spdk_lvol_req *req;
@@ -1113,31 +1127,22 @@ spdk_lvol_resize(struct spdk_lvol *lvol, uint64_t sz,
 		/* Check if there is enough clusters left to resize */
 		if (new_clusters - used_clusters > free_clusters) {
 			SPDK_ERRLOG("Not enough free clusters left on lvol store to resize lvol to %zu clusters\n", sz);
-			return -ENOMEM;
+			cb_fn(cb_arg, -ENOMEM);
+			return;
 		}
 	}
 
 	req = calloc(1, sizeof(*req));
 	if (!req) {
 		SPDK_ERRLOG("Cannot alloc memory for lvol request pointer\n");
-		return -ENOMEM;
+		cb_fn(cb_arg, -ENOMEM);
+		return;
 	}
 	req->cb_fn = cb_fn;
 	req->cb_arg = cb_arg;
+	req->lvol = lvol;
 
-	rc = spdk_blob_resize(blob, sz);
-	if (rc < 0) {
-		goto invalid;
-	}
-
-	spdk_blob_sync_md(blob, _spdk_lvol_resize_cb, req);
-
-	return rc;
-
-invalid:
-	req->cb_fn(req->cb_arg, rc);
-	free(req);
-	return rc;
+	spdk_blob_resize(blob, sz, _spdk_lvol_blob_resize_cb, req);
 }
 
 static void
diff --git a/test/unit/lib/bdev/vbdev_lvol.c/vbdev_lvol_ut.c b/test/unit/lib/bdev/vbdev_lvol.c/vbdev_lvol_ut.c
index e3203e3de..152c344f6 100644
--- a/test/unit/lib/bdev/vbdev_lvol.c/vbdev_lvol_ut.c
+++ b/test/unit/lib/bdev/vbdev_lvol.c/vbdev_lvol_ut.c
@@ -334,12 +334,10 @@ spdk_lvs_destroy(struct spdk_lvol_store *lvs, spdk_lvs_op_complete cb_fn,
 	return 0;
 }
 
-int
+void
 spdk_lvol_resize(struct spdk_lvol *lvol, size_t sz,  spdk_lvol_op_complete cb_fn, void *cb_arg)
 {
 	cb_fn(cb_arg, 0);
-
-	return 0;
 }
 
 int
diff --git a/test/unit/lib/blob/blob.c/blob_ut.c b/test/unit/lib/blob/blob.c/blob_ut.c
index 8ee494701..bc92405d3 100644
--- a/test/unit/lib/blob/blob.c/blob_ut.c
+++ b/test/unit/lib/blob/blob.c/blob_ut.c
@@ -590,7 +590,6 @@ blob_resize(void)
 	struct spdk_blob *blob;
 	spdk_blob_id blobid;
 	uint64_t free_clusters;
-	int rc;
 
 	dev = init_dev();
 
@@ -613,20 +612,20 @@ blob_resize(void)
 
 	/* Confirm that resize fails if blob is marked read-only. */
 	blob->md_ro = true;
-	rc = spdk_blob_resize(blob, 5);
-	CU_ASSERT(rc == -EPERM);
+	spdk_blob_resize(blob, 5, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == -EPERM);
 	blob->md_ro = false;
 
 	/* The blob started at 0 clusters. Resize it to be 5. */
-	rc = spdk_blob_resize(blob, 5);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 5, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 	CU_ASSERT((free_clusters - 5) == spdk_bs_free_cluster_count(bs));
 
 	/* Shrink the blob to 3 clusters. This will not actually release
 	 * the old clusters until the blob is synced.
 	 */
-	rc = spdk_blob_resize(blob, 3);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 3, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 	/* Verify there are still 5 clusters in use */
 	CU_ASSERT((free_clusters - 5) == spdk_bs_free_cluster_count(bs));
 
@@ -636,13 +635,13 @@ blob_resize(void)
 	CU_ASSERT((free_clusters - 3) == spdk_bs_free_cluster_count(bs));
 
 	/* Resize the blob to be 10 clusters. Growth takes effect immediately. */
-	rc = spdk_blob_resize(blob, 10);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 10, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 	CU_ASSERT((free_clusters - 10) == spdk_bs_free_cluster_count(bs));
 
 	/* Try to resize the blob to size larger than blobstore. */
-	rc = spdk_blob_resize(blob, bs->total_clusters + 1);
-	CU_ASSERT(rc == -ENOSPC);
+	spdk_blob_resize(blob, bs->total_clusters + 1, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == -ENOSPC);
 
 	spdk_blob_close(blob, blob_op_complete, NULL);
 	CU_ASSERT(g_bserrno == 0);
@@ -775,7 +774,6 @@ blob_write(void)
 	spdk_blob_id blobid;
 	uint64_t pages_per_cluster;
 	uint8_t payload[10 * 4096];
-	int rc;
 
 	dev = init_dev();
 
@@ -804,8 +802,8 @@ blob_write(void)
 	CU_ASSERT(g_bserrno == -EINVAL);
 
 	/* Resize the blob */
-	rc = spdk_blob_resize(blob, 5);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 5, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 
 	/* Confirm that write fails if blob is marked read-only. */
 	blob->data_ro = true;
@@ -847,7 +845,6 @@ blob_read(void)
 	spdk_blob_id blobid;
 	uint64_t pages_per_cluster;
 	uint8_t payload[10 * 4096];
-	int rc;
 
 	dev = init_dev();
 
@@ -876,8 +873,8 @@ blob_read(void)
 	CU_ASSERT(g_bserrno == -EINVAL);
 
 	/* Resize the blob */
-	rc = spdk_blob_resize(blob, 5);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 5, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 
 	/* Confirm that read passes if blob is marked read-only. */
 	blob->data_ro = true;
@@ -919,7 +916,6 @@ blob_rw_verify(void)
 	spdk_blob_id blobid;
 	uint8_t payload_read[10 * 4096];
 	uint8_t payload_write[10 * 4096];
-	int rc;
 
 	dev = init_dev();
 
@@ -941,8 +937,8 @@ blob_rw_verify(void)
 	CU_ASSERT(g_blob != NULL);
 	blob = g_blob;
 
-	rc = spdk_blob_resize(blob, 32);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 32, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 
 	memset(payload_write, 0xE5, sizeof(payload_write));
 	spdk_blob_io_write(blob, channel, payload_write, 4, 10, blob_op_complete, NULL);
@@ -976,7 +972,6 @@ blob_rw_verify_iov(void)
 	struct iovec iov_read[3];
 	struct iovec iov_write[3];
 	void *buf;
-	int rc;
 
 	dev = init_dev();
 	memset(g_dev_buffer, 0, DEV_BUFFER_SIZE);
@@ -999,8 +994,8 @@ blob_rw_verify_iov(void)
 	SPDK_CU_ASSERT_FATAL(g_blob != NULL);
 	blob = g_blob;
 
-	rc = spdk_blob_resize(blob, 2);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 2, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 
 	/*
 	 * Manually adjust the offset of the blob's second cluster.  This allows
@@ -1078,7 +1073,6 @@ blob_rw_verify_iov_nomem(void)
 	uint8_t payload_write[10 * 4096];
 	struct iovec iov_write[3];
 	uint32_t req_count;
-	int rc;
 
 	dev = init_dev();
 	memset(g_dev_buffer, 0, DEV_BUFFER_SIZE);
@@ -1101,8 +1095,8 @@ blob_rw_verify_iov_nomem(void)
 	CU_ASSERT(g_blob != NULL);
 	blob = g_blob;
 
-	rc = spdk_blob_resize(blob, 2);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 2, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 
 	/*
 	 * Choose a page offset just before the cluster boundary.  The first 6 pages of payload
@@ -1143,7 +1137,6 @@ blob_rw_iov_read_only(void)
 	uint8_t payload_write[4096];
 	struct iovec iov_read;
 	struct iovec iov_write;
-	int rc;
 
 	dev = init_dev();
 	memset(g_dev_buffer, 0, DEV_BUFFER_SIZE);
@@ -1166,8 +1159,8 @@ blob_rw_iov_read_only(void)
 	SPDK_CU_ASSERT_FATAL(g_blob != NULL);
 	blob = g_blob;
 
-	rc = spdk_blob_resize(blob, 2);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 2, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 
 	/* Verify that writev failed if read_only flag is set. */
 	blob->data_ro = true;
@@ -1202,7 +1195,6 @@ blob_unmap(void)
 	spdk_blob_id blobid;
 	struct spdk_blob_opts opts;
 	uint8_t payload[4096];
-	int rc;
 	int i;
 
 	dev = init_dev();
@@ -1228,8 +1220,8 @@ blob_unmap(void)
 	SPDK_CU_ASSERT_FATAL(g_blob != NULL);
 	blob = g_blob;
 
-	rc = spdk_blob_resize(blob, 10);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 10, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 
 	memset(payload, 0, sizeof(payload));
 	payload[0] = 0xFF;
@@ -1259,8 +1251,8 @@ blob_unmap(void)
 	blob->active.clusters[8] = 0;
 
 	/* Unmap clusters by resizing to 0 */
-	rc = spdk_blob_resize(blob, 0);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 0, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 
 	spdk_blob_sync_md(blob, blob_op_complete, NULL);
 	CU_ASSERT(g_bserrno == 0);
@@ -1522,8 +1514,8 @@ bs_load(void)
 	CU_ASSERT(rc == 0);
 
 	/* Resize the blob */
-	rc = spdk_blob_resize(blob, 10);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 10, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 
 	spdk_blob_close(blob, blob_op_complete, NULL);
 	CU_ASSERT(g_bserrno == 0);
@@ -1865,7 +1857,7 @@ bs_usable_clusters(void)
 	struct spdk_bs_dev *dev;
 	struct spdk_bs_opts opts;
 	uint32_t clusters;
-	int i, rc;
+	int i;
 
 	/* Init blobstore */
 	dev = init_dev();
@@ -1904,8 +1896,8 @@ bs_usable_clusters(void)
 		CU_ASSERT(g_bserrno == 0);
 		CU_ASSERT(g_blob !=  NULL);
 
-		rc = spdk_blob_resize(g_blob, 10);
-		CU_ASSERT(rc == 0);
+		spdk_blob_resize(g_blob, 10, blob_op_complete, NULL);
+		CU_ASSERT(g_bserrno == 0);
 
 		g_bserrno = -1;
 		spdk_blob_close(g_blob, blob_op_complete, NULL);
@@ -2082,8 +2074,8 @@ blob_serialize(void)
 	 * over of the extents.
 	 */
 	for (i = 0; i < 6; i++) {
-		rc = spdk_blob_resize(blob[i % 2], (i / 2) + 1);
-		CU_ASSERT(rc == 0);
+		spdk_blob_resize(blob[i % 2], (i / 2) + 1, blob_op_complete, NULL);
+		CU_ASSERT(g_bserrno == 0);
 	}
 
 	for (i = 0; i < 2; i++) {
@@ -2265,8 +2257,8 @@ blob_dirty_shutdown(void)
 	CU_ASSERT(rc == 0);
 
 	/* Resize the blob */
-	rc = spdk_blob_resize(blob, 10);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 10, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 
 	/* Set the blob as the super blob */
 	spdk_bs_set_super(g_bs, blobid1, blob_op_complete, NULL);
@@ -2310,8 +2302,8 @@ blob_dirty_shutdown(void)
 	CU_ASSERT(spdk_blob_get_num_clusters(blob) == 10);
 
 	/* Resize the blob */
-	rc = spdk_blob_resize(blob, 20);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 20, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 
 	free_clusters = spdk_bs_free_cluster_count(g_bs);
 
@@ -2364,8 +2356,8 @@ blob_dirty_shutdown(void)
 	CU_ASSERT(rc == 0);
 
 	/* Resize the blob */
-	rc = spdk_blob_resize(blob, 10);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 10, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 
 	free_clusters = spdk_bs_free_cluster_count(g_bs);
 
@@ -2571,8 +2563,8 @@ blob_flags(void)
 
 	/* Change the size of blob_data_ro to check if flags are serialized
 	 * when blob has non zero number of extents */
-	rc = spdk_blob_resize(blob_data_ro, 10);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob_data_ro, 10, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 
 	/* Set the xattr to check if flags are serialized
 	 * when blob has non zero number of xattrs */
@@ -2855,7 +2847,6 @@ blob_thin_prov_alloc(void)
 	struct spdk_blob_opts opts;
 	spdk_blob_id blobid;
 	uint64_t free_clusters;
-	int rc;
 
 	dev = init_dev();
 
@@ -2884,15 +2875,15 @@ blob_thin_prov_alloc(void)
 	CU_ASSERT(spdk_blob_get_num_clusters(blob) == 0);
 
 	/* The blob started at 0 clusters. Resize it to be 5, but still unallocated. */
-	rc = spdk_blob_resize(blob, 5);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 5, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 	CU_ASSERT(free_clusters == spdk_bs_free_cluster_count(bs));
 	CU_ASSERT(blob->active.num_clusters == 5);
 	CU_ASSERT(spdk_blob_get_num_clusters(blob) == 5);
 
 	/* Shrink the blob to 3 clusters - still unallocated */
-	rc = spdk_blob_resize(blob, 3);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 3, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 	CU_ASSERT(free_clusters == spdk_bs_free_cluster_count(bs));
 	CU_ASSERT(blob->active.num_clusters == 3);
 	CU_ASSERT(spdk_blob_get_num_clusters(blob) == 3);
@@ -3034,7 +3025,6 @@ blob_thin_prov_rw(void)
 	uint64_t free_clusters;
 	uint8_t payload_read[10 * 4096];
 	uint8_t payload_write[10 * 4096];
-	int rc;
 
 	dev = init_dev();
 
@@ -3064,8 +3054,8 @@ blob_thin_prov_rw(void)
 	CU_ASSERT(blob->active.num_clusters == 0);
 
 	/* The blob started at 0 clusters. Resize it to be 5, but still unallocated. */
-	rc = spdk_blob_resize(blob, 5);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 5, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 	CU_ASSERT(free_clusters == spdk_bs_free_cluster_count(bs));
 	CU_ASSERT(blob->active.num_clusters == 5);
 
@@ -3123,8 +3113,6 @@ blob_thin_prov_rw_iov(void)
 	struct iovec iov_read[3];
 	struct iovec iov_write[3];
 
-	int rc;
-
 	dev = init_dev();
 
 	spdk_bs_init(dev, NULL, bs_op_with_handle_complete, NULL);
@@ -3153,8 +3141,8 @@ blob_thin_prov_rw_iov(void)
 	CU_ASSERT(blob->active.num_clusters == 0);
 
 	/* The blob started at 0 clusters. Resize it to be 5, but still unallocated. */
-	rc = spdk_blob_resize(blob, 5);
-	CU_ASSERT(rc == 0);
+	spdk_blob_resize(blob, 5, blob_op_complete, NULL);
+	CU_ASSERT(g_bserrno == 0);
 	CU_ASSERT(free_clusters == spdk_bs_free_cluster_count(bs));
 	CU_ASSERT(blob->active.num_clusters == 5);
 
@@ -3265,8 +3253,8 @@ bs_load_iter(void)
 		CU_ASSERT(rc == 0);
 
 		/* Resize the blob */
-		rc = spdk_blob_resize(blob, i);
-		CU_ASSERT(rc == 0);
+		spdk_blob_resize(blob, i, blob_op_complete, NULL);
+		CU_ASSERT(g_bserrno == 0);
 
 		spdk_blob_close(blob, blob_op_complete, NULL);
 		CU_ASSERT(g_bserrno == 0);
diff --git a/test/unit/lib/lvol/lvol.c/lvol_ut.c b/test/unit/lib/lvol/lvol.c/lvol_ut.c
index 3bf612cea..21c5c10af 100644
--- a/test/unit/lib/lvol/lvol.c/lvol_ut.c
+++ b/test/unit/lib/lvol/lvol.c/lvol_ut.c
@@ -321,15 +321,15 @@ void spdk_blob_close(struct spdk_blob *b, spdk_blob_op_complete cb_fn, void *cb_
 	cb_fn(cb_arg, b->close_status);
 }
 
-int
-spdk_blob_resize(struct spdk_blob *blob, uint64_t sz)
+void
+spdk_blob_resize(struct spdk_blob *blob, uint64_t sz, spdk_blob_op_complete cb_fn, void *cb_arg)
 {
 	if (g_resize_rc != 0) {
-		return g_resize_rc;
+		return cb_fn(cb_arg, g_resize_rc);
 	} else if (sz > DEV_BUFFER_SIZE / BS_CLUSTER_SIZE) {
-		return -1;
+		return cb_fn(cb_arg, -ENOMEM);
 	}
-	return 0;
+	cb_fn(cb_arg, 0);
 }
 
 void
@@ -927,34 +927,30 @@ lvol_resize(void)
 	SPDK_CU_ASSERT_FATAL(g_lvol != NULL);
 
 	/* Resize to same size */
-	rc = spdk_lvol_resize(g_lvol, 10, lvol_store_op_complete, NULL);
-	CU_ASSERT(rc == 0);
+	spdk_lvol_resize(g_lvol, 10, lvol_store_op_complete, NULL);
 	CU_ASSERT(g_lvserrno == 0);
 
 	/* Resize to smaller size */
-	rc = spdk_lvol_resize(g_lvol, 5, lvol_store_op_complete, NULL);
-	CU_ASSERT(rc == 0);
+	spdk_lvol_resize(g_lvol, 5, lvol_store_op_complete, NULL);
 	CU_ASSERT(g_lvserrno == 0);
 
 	/* Resize to bigger size */
-	rc = spdk_lvol_resize(g_lvol, 15, lvol_store_op_complete, NULL);
-	CU_ASSERT(rc == 0);
+	spdk_lvol_resize(g_lvol, 15, lvol_store_op_complete, NULL);
 	CU_ASSERT(g_lvserrno == 0);
 
 	/* Resize to size = 0 */
-	rc = spdk_lvol_resize(g_lvol, 0, lvol_store_op_complete, NULL);
-	CU_ASSERT(rc == 0);
+	spdk_lvol_resize(g_lvol, 0, lvol_store_op_complete, NULL);
 	CU_ASSERT(g_lvserrno == 0);
 
 	/* Resize to bigger size than available */
-	rc = spdk_lvol_resize(g_lvol, 0xFFFFFFFF, lvol_store_op_complete, NULL);
-	CU_ASSERT(rc != 0);
+	g_lvserrno = 0;
+	spdk_lvol_resize(g_lvol, 0xFFFFFFFF, lvol_store_op_complete, NULL);
+	CU_ASSERT(g_lvserrno != 0);
 
 	/* Fail resize */
 	g_resize_rc = -1;
 	g_lvserrno = 0;
-	rc = spdk_lvol_resize(g_lvol, 10, lvol_store_op_complete, NULL);
-	CU_ASSERT(rc != 0);
+	spdk_lvol_resize(g_lvol, 10, lvol_store_op_complete, NULL);
 	CU_ASSERT(g_lvserrno != 0);
 	g_resize_rc = 0;