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block: introduce bdrv_remove_file_or_backing_child()

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To be used for reopen in future commit.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20210610120537.196183-2-vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2021-06-10 15:05:29 +03:00 committed by Kevin Wolf
parent 7ec390d587
commit 5b9950193b
1 changed files with 17 additions and 7 deletions
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22
block.c
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@ -4795,17 +4795,16 @@ static TransactionActionDrv bdrv_remove_filter_or_cow_child_drv = {
}; };
/* /*
* A function to remove backing-chain child of @bs if exists: cow child for * A function to remove backing or file child of @bs.
* format nodes (always .backing) and filter child for filters (may be .file or
* .backing)
*
* Function doesn't update permissions, caller is responsible for this. * Function doesn't update permissions, caller is responsible for this.
*/ */
static void bdrv_remove_filter_or_cow_child(BlockDriverState *bs, static void bdrv_remove_file_or_backing_child(BlockDriverState *bs,
BdrvChild *child,
Transaction *tran) Transaction *tran)
{ {
BdrvRemoveFilterOrCowChild *s; BdrvRemoveFilterOrCowChild *s;
BdrvChild *child = bdrv_filter_or_cow_child(bs);
assert(child == bs->backing || child == bs->file);
if (!child) { if (!child) {
return; return;
@ -4830,6 +4829,17 @@ static void bdrv_remove_filter_or_cow_child(BlockDriverState *bs,
} }
} }
/*
* A function to remove backing-chain child of @bs if exists: cow child for
* format nodes (always .backing) and filter child for filters (may be .file or
* .backing)
*/
static void bdrv_remove_filter_or_cow_child(BlockDriverState *bs,
Transaction *tran)
{
bdrv_remove_file_or_backing_child(bs, bdrv_filter_or_cow_child(bs), tran);
}
static int bdrv_replace_node_noperm(BlockDriverState *from, static int bdrv_replace_node_noperm(BlockDriverState *from,
BlockDriverState *to, BlockDriverState *to,
bool auto_skip, Transaction *tran, bool auto_skip, Transaction *tran,