[PATCH v2 04/36] block: bdrv_append(): return status

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

Return int status to avoid extra error propagation schemes.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 include/block/block.h       |  4 ++--
 block.c                     | 15 ++++++++-------
 block/commit.c              |  6 ++----
 block/mirror.c              |  6 ++----
 blockdev.c                  |  6 +++---
 tests/test-bdrv-graph-mod.c |  6 +++---
 6 files changed, 20 insertions(+), 23 deletions(-)

diff --git a/include/block/block.h b/include/block/block.h
index db37a35cee..ee3f5a6cca 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -344,8 +344,8 @@ int bdrv_create(BlockDriver *drv, const char* filename,
 int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp);
 
 BlockDriverState *bdrv_new(void);
-void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
-                 Error **errp);
+int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
+                Error **errp);
 void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to,
                        Error **errp);
 
diff --git a/block.c b/block.c
index 55efef3c9d..916087ee1a 100644
--- a/block.c
+++ b/block.c
@@ -3103,7 +3103,6 @@ static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs,
     int64_t total_size;
     QemuOpts *opts = NULL;
     BlockDriverState *bs_snapshot = NULL;
-    Error *local_err = NULL;
     int ret;
 
     /* if snapshot, we create a temporary backing file and open it
@@ -3145,9 +3144,8 @@ static BlockDriverState *bdrv_append_temp_snapshot(BlockDriverState *bs,
         goto out;
     }
 
-    bdrv_append(bs_snapshot, bs, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+    ret = bdrv_append(bs_snapshot, bs, errp);
+    if (ret < 0) {
         bs_snapshot = NULL;
         goto out;
     }
@@ -4606,22 +4604,25 @@ void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to,
  * Recent update: bdrv_append does NOT eat bs_new reference for now. Drop this
  * comment several moths later.
  */
-void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
-                 Error **errp)
+int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
+                Error **errp)
 {
     Error *local_err = NULL;
 
     bdrv_set_backing_hd(bs_new, bs_top, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
-        return;
+        return -EPERM;
     }
 
     bdrv_replace_node(bs_top, bs_new, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         bdrv_set_backing_hd(bs_new, NULL, &error_abort);
+        return -EPERM;
     }
+
+    return 0;
 }
 
 static void bdrv_delete(BlockDriverState *bs)
diff --git a/block/commit.c b/block/commit.c
index 61924bcf66..b89bb20b75 100644
--- a/block/commit.c
+++ b/block/commit.c
@@ -254,7 +254,6 @@ void commit_start(const char *job_id, BlockDriverState *bs,
     BlockDriverState *iter;
     BlockDriverState *commit_top_bs = NULL;
     BlockDriverState *filtered_base;
-    Error *local_err = NULL;
     int64_t base_size, top_size;
     uint64_t base_perms, iter_shared_perms;
     int ret;
@@ -312,11 +311,10 @@ void commit_start(const char *job_id, BlockDriverState *bs,
 
     commit_top_bs->total_sectors = top->total_sectors;
 
-    bdrv_append(commit_top_bs, top, &local_err);
+    ret = bdrv_append(commit_top_bs, top, errp);
     bdrv_unref(commit_top_bs); /* referenced by new parents or failed */
-    if (local_err) {
+    if (ret < 0) {
         commit_top_bs = NULL;
-        error_propagate(errp, local_err);
         goto fail;
     }
 
diff --git a/block/mirror.c b/block/mirror.c
index 13f7ecc998..c3fbe3e8bd 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1560,7 +1560,6 @@ static BlockJob *mirror_start_job(
     BlockDriverState *mirror_top_bs;
     bool target_is_backing;
     uint64_t target_perms, target_shared_perms;
-    Error *local_err = NULL;
     int ret;
 
     if (granularity == 0) {
@@ -1606,12 +1605,11 @@ static BlockJob *mirror_start_job(
     mirror_top_bs->opaque = bs_opaque;
 
     bdrv_drained_begin(bs);
-    bdrv_append(mirror_top_bs, bs, &local_err);
+    ret = bdrv_append(mirror_top_bs, bs, errp);
     bdrv_drained_end(bs);
 
-    if (local_err) {
+    if (ret < 0) {
         bdrv_unref(mirror_top_bs);
-        error_propagate(errp, local_err);
         return NULL;
     }
 
diff --git a/blockdev.c b/blockdev.c
index 96c96f8ba6..2af35d0958 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1432,6 +1432,7 @@ typedef struct ExternalSnapshotState {
 static void external_snapshot_prepare(BlkActionState *common,
                                       Error **errp)
 {
+    int ret;
     int flags = 0;
     QDict *options = NULL;
     Error *local_err = NULL;
@@ -1587,9 +1588,8 @@ static void external_snapshot_prepare(BlkActionState *common,
         goto out;
     }
 
-    bdrv_append(state->new_bs, state->old_bs, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+    ret = bdrv_append(state->new_bs, state->old_bs, errp);
+    if (ret < 0) {
         goto out;
     }
     state->overlay_appended = true;
diff --git a/tests/test-bdrv-graph-mod.c b/tests/test-bdrv-graph-mod.c
index cfe096c9af..74f4a4153b 100644
--- a/tests/test-bdrv-graph-mod.c
+++ b/tests/test-bdrv-graph-mod.c
@@ -122,7 +122,7 @@ static BlockDriverState *exclusive_writer_node(const char *name)
  */
 static void test_update_perm_tree(void)
 {
-    Error *local_err = NULL;
+    int ret;
 
     BlockBackend *root = blk_new(qemu_get_aio_context(),
                                  BLK_PERM_WRITE | BLK_PERM_CONSISTENT_READ,
@@ -135,8 +135,8 @@ static void test_update_perm_tree(void)
     bdrv_attach_child(filter, bs, "child", &child_of_bds,
                       BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, &error_abort);
 
-    bdrv_append(filter, bs, &local_err);
-    error_free_or_abort(&local_err);
+    ret = bdrv_append(filter, bs, NULL);
+    g_assert_cmpint(ret, <, 0);
 
     bdrv_unref(filter);
     blk_unref(root);
-- 
2.21.3