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block: Use BdrvChild in BlockBackend

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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2016-03-08 13:47:46 +01:00
parent 9aaf28c61d
commit f21d96d04b
3 changed files with 192 additions and 114 deletions
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47
block.c
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@ -1175,10 +1175,9 @@ static int bdrv_fill_options(QDict **options, const char *filename,
return 0;
}
static BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
BlockDriverState *child_bs,
const char *child_name,
const BdrvChildRole *child_role)
BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
const char *child_name,
const BdrvChildRole *child_role)
{
BdrvChild *child = g_new(BdrvChild, 1);
*child = (BdrvChild) {
@ -1187,24 +1186,43 @@ static BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
.role = child_role,
};
QLIST_INSERT_HEAD(&parent_bs->children, child, next);
QLIST_INSERT_HEAD(&child_bs->parents, child, next_parent);
return child;
}
static BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
BlockDriverState *child_bs,
const char *child_name,
const BdrvChildRole *child_role)
{
BdrvChild *child = bdrv_root_attach_child(child_bs, child_name, child_role);
QLIST_INSERT_HEAD(&parent_bs->children, child, next);
return child;
}
static void bdrv_detach_child(BdrvChild *child)
{
QLIST_REMOVE(child, next);
if (child->next.le_prev) {
QLIST_REMOVE(child, next);
child->next.le_prev = NULL;
}
QLIST_REMOVE(child, next_parent);
g_free(child->name);
g_free(child);
}
void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child)
void bdrv_root_unref_child(BdrvChild *child)
{
BlockDriverState *child_bs;
child_bs = child->bs;
bdrv_detach_child(child);
bdrv_unref(child_bs);
}
void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child)
{
if (child == NULL) {
return;
}
@ -1213,9 +1231,7 @@ void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child)
child->bs->inherits_from = NULL;
}
child_bs = child->bs;
bdrv_detach_child(child);
bdrv_unref(child_bs);
bdrv_root_unref_child(child);
}
/*
@ -2255,6 +2271,14 @@ static void change_parent_backing_link(BlockDriverState *from,
{
BdrvChild *c, *next;
if (from->blk) {
/* FIXME We bypass blk_set_bs(), so we need to make these updates
* manually. The root problem is not in this change function, but the
* existence of BlockDriverState.blk. */
to->blk = from->blk;
from->blk = NULL;
}
QLIST_FOREACH_SAFE(c, &from->parents, next_parent, next) {
assert(c->role != &child_backing);
c->bs = to;
@ -2263,9 +2287,6 @@ static void change_parent_backing_link(BlockDriverState *from,
bdrv_ref(to);
bdrv_unref(from);
}
if (from->blk) {
blk_set_bs(from->blk, to);
}
}
static void swap_feature_fields(BlockDriverState *bs_top,