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block: Introduce bdrv_unref_child()
This is the counterpart for bdrv_open_child(). It decreases the reference count of the child BDS and removes it from the list of children of the given parent BDS. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com>
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parent
b4b059f628
commit
33a604075c
23
block.c
23
block.c
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@ -1117,6 +1117,24 @@ static BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
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return child;
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}
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static void bdrv_detach_child(BdrvChild *child)
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{
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QLIST_REMOVE(child, next);
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g_free(child);
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}
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void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child)
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{
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BlockDriverState *child_bs = child->bs;
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if (child->bs->inherits_from == parent) {
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child->bs->inherits_from = NULL;
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}
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bdrv_detach_child(child);
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bdrv_unref(child_bs);
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}
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void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd)
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{
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@ -1884,11 +1902,12 @@ void bdrv_close(BlockDriverState *bs)
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BdrvChild *child, *next;
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QLIST_FOREACH_SAFE(child, &bs->children, next, next) {
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/* TODO Remove bdrv_unref() from drivers' close function and use
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* bdrv_unref_child() here */
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if (child->bs->inherits_from == bs) {
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child->bs->inherits_from = NULL;
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}
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QLIST_REMOVE(child, next);
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g_free(child);
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bdrv_detach_child(child);
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}
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if (bs->backing_hd) {
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@ -513,6 +513,7 @@ void bdrv_disable_copy_on_read(BlockDriverState *bs);
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void bdrv_ref(BlockDriverState *bs);
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void bdrv_unref(BlockDriverState *bs);
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void bdrv_unref_child(BlockDriverState *parent, BdrvChild *child);
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bool bdrv_op_is_blocked(BlockDriverState *bs, BlockOpType op, Error **errp);
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void bdrv_op_block(BlockDriverState *bs, BlockOpType op, Error *reason);
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