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[PATCH v7 01/33] block: introduce bdrv_replace_child_bs()
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
[PATCH v7 01/33] block: introduce bdrv_replace_child_bs() |
Date: |
Wed, 4 Aug 2021 12:37:41 +0300 |
Add function to transactionally replace bs inside BdrvChild.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
include/block/block.h | 2 ++
block.c | 31 +++++++++++++++++++++++++++++++
2 files changed, 33 insertions(+)
diff --git a/include/block/block.h b/include/block/block.h
index 3477290f9a..740038a892 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -361,6 +361,8 @@ int bdrv_append(BlockDriverState *bs_new, BlockDriverState
*bs_top,
Error **errp);
int bdrv_replace_node(BlockDriverState *from, BlockDriverState *to,
Error **errp);
+int bdrv_replace_child_bs(BdrvChild *child, BlockDriverState *new_bs,
+ Error **errp);
BlockDriverState *bdrv_insert_node(BlockDriverState *bs, QDict *node_options,
int flags, Error **errp);
int bdrv_drop_filter(BlockDriverState *bs, Error **errp);
diff --git a/block.c b/block.c
index e97ce0b1c8..b2b66263f9 100644
--- a/block.c
+++ b/block.c
@@ -5048,6 +5048,37 @@ out:
return ret;
}
+/* Not for empty child */
+int bdrv_replace_child_bs(BdrvChild *child, BlockDriverState *new_bs,
+ Error **errp)
+{
+ int ret;
+ Transaction *tran = tran_new();
+ g_autoptr(GHashTable) found = NULL;
+ g_autoptr(GSList) refresh_list = NULL;
+ BlockDriverState *old_bs = child->bs;
+
+ bdrv_ref(old_bs);
+ bdrv_drained_begin(old_bs);
+ bdrv_drained_begin(new_bs);
+
+ bdrv_replace_child_tran(child, new_bs, tran);
+
+ found = g_hash_table_new(NULL, NULL);
+ refresh_list = bdrv_topological_dfs(refresh_list, found, old_bs);
+ refresh_list = bdrv_topological_dfs(refresh_list, found, new_bs);
+
+ ret = bdrv_list_refresh_perms(refresh_list, NULL, tran, errp);
+
+ tran_finalize(tran, ret);
+
+ bdrv_drained_end(old_bs);
+ bdrv_drained_end(new_bs);
+ bdrv_unref(old_bs);
+
+ return ret;
+}
+
static void bdrv_delete(BlockDriverState *bs)
{
assert(bdrv_op_blocker_is_empty(bs));
--
2.29.2
- [PATCH v7 00/33] block: publish backup-top filter, Vladimir Sementsov-Ogievskiy, 2021/08/04
- [PATCH v7 01/33] block: introduce bdrv_replace_child_bs(),
Vladimir Sementsov-Ogievskiy <=
- [PATCH v7 02/33] block: introduce blk_replace_bs, Vladimir Sementsov-Ogievskiy, 2021/08/04
- [PATCH v7 05/33] block: rename backup-top to copy-before-write, Vladimir Sementsov-Ogievskiy, 2021/08/04
- [PATCH v7 03/33] qdev-properties: PropertyInfo: add realized_set_allowed field, Vladimir Sementsov-Ogievskiy, 2021/08/04
- [PATCH v7 06/33] block-copy: move detecting fleecing scheme to block-copy, Vladimir Sementsov-Ogievskiy, 2021/08/04
- [PATCH v7 07/33] block/block-copy: introduce block_copy_set_copy_opts(), Vladimir Sementsov-Ogievskiy, 2021/08/04
- [PATCH v7 10/33] block/copy-before-write: relax permission requirements when no parents, Vladimir Sementsov-Ogievskiy, 2021/08/04