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block: Restructure remove_file_or_backing_child()

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As of a future patch, bdrv_replace_child_tran() will take a BdrvChild **
pointer.  Prepare for that by getting such a pointer and using it where
applicable, and (dereferenced) as a parameter for
bdrv_replace_child_tran().

Signed-off-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20211111120829.81329-7-hreitz@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20211115145409.176785-7-kwolf@redhat.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>
This commit is contained in:
Hanna Reitz 2021-11-15 15:54:02 +01:00
parent be64bbb014
commit 562bda8bb4
1 changed files with 12 additions and 9 deletions
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21
block.c
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@ -4887,30 +4887,33 @@ static void bdrv_remove_file_or_backing_child(BlockDriverState *bs,
BdrvChild *child,
Transaction *tran)
{
BdrvChild **childp;
BdrvRemoveFilterOrCowChild *s;
assert(child == bs->backing || child == bs->file);
if (!child) {
return;
}
if (child == bs->backing) {
childp = &bs->backing;
} else if (child == bs->file) {
childp = &bs->file;
} else {
g_assert_not_reached();
}
if (child->bs) {
bdrv_replace_child_tran(child, NULL, tran);
bdrv_replace_child_tran(*childp, NULL, tran);
}
s = g_new(BdrvRemoveFilterOrCowChild, 1);
*s = (BdrvRemoveFilterOrCowChild) {
.child = child,
.is_backing = (child == bs->backing),
.is_backing = (childp == &bs->backing),
};
tran_add(tran, &bdrv_remove_filter_or_cow_child_drv, s);
if (s->is_backing) {
bs->backing = NULL;
} else {
bs->file = NULL;
}
*childp = NULL;
}
/*