diff mbox series

[v14,02/13] block: add API function to insert a node

Message ID 20201204220758.2879-3-vsementsov@virtuozzo.com
State New
Headers show
Series Apply COR-filter to the block-stream permanently | expand

Commit Message

Vladimir Sementsov-Ogievskiy Dec. 4, 2020, 10:07 p.m. UTC 
From: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>

Provide API for insertion a node to backing chain.

Suggested-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 include/block/block.h |  2 ++
 block.c               | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

Comments

Max Reitz Dec. 10, 2020, 5:33 p.m. UTC | #1 
On 04.12.20 23:07, Vladimir Sementsov-Ogievskiy wrote:
> From: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
> 
> Provide API for insertion a node to backing chain.
> 
> Suggested-by: Max Reitz <mreitz@redhat.com>
> Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---
>   include/block/block.h |  2 ++
>   block.c               | 25 +++++++++++++++++++++++++
>   2 files changed, 27 insertions(+)

[...]

> diff --git a/block.c b/block.c
> index f1cedac362..b71c39f3e6 100644
> --- a/block.c
> +++ b/block.c
> @@ -4698,6 +4698,31 @@ static void bdrv_delete(BlockDriverState *bs)
>       g_free(bs);
>   }
>   
> +BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *node_options,
> +                                   int flags, Error **errp)
> +{
> +    BlockDriverState *new_node_bs;
> +    Error *local_err = NULL;
> +
> +    new_node_bs =  bdrv_open(NULL, NULL, node_options, flags, errp);

s/ =  / = /

With that done:

Reviewed-by: Max Reitz <mreitz@redhat.com>
diff mbox series

Patch

diff --git a/include/block/block.h b/include/block/block.h
index c9d7c58765..81a3894129 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -350,6 +350,8 @@  void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top,
                  Error **errp);
 void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to,
                        Error **errp);
+BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *node_options,
+                                   int flags, Error **errp);
 
 int bdrv_parse_aio(const char *mode, int *flags);
 int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough);
diff --git a/block.c b/block.c
index f1cedac362..b71c39f3e6 100644
--- a/block.c
+++ b/block.c
@@ -4698,6 +4698,31 @@  static void bdrv_delete(BlockDriverState *bs)
     g_free(bs);
 }
 
+BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *node_options,
+                                   int flags, Error **errp)
+{
+    BlockDriverState *new_node_bs;
+    Error *local_err = NULL;
+
+    new_node_bs =  bdrv_open(NULL, NULL, node_options, flags, errp);
+    if (new_node_bs == NULL) {
+        error_prepend(errp, "Could not create node: ");
+        return NULL;
+    }
+
+    bdrv_drained_begin(bs);
+    bdrv_replace_node(bs, new_node_bs, &local_err);
+    bdrv_drained_end(bs);
+
+    if (local_err) {
+        bdrv_unref(new_node_bs);
+        error_propagate(errp, local_err);
+        return NULL;
+    }
+
+    return new_node_bs;
+}
+
 /*
  * Run consistency checks on an image
  *