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block: Introduce parents list 

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2015-09-17 13:18:23 +02:00
parent a2d6190048
commit d42a8a935b
2 changed files with 5 additions and 0 deletions
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3
block.c
View File

@ -1090,6 +1090,7 @@ static BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
}; };
QLIST_INSERT_HEAD(&parent_bs->children, child, next); QLIST_INSERT_HEAD(&parent_bs->children, child, next);
QLIST_INSERT_HEAD(&child_bs->parents, child, next_parent);
return child; return child;
} }
@ -1097,6 +1098,7 @@ static BdrvChild *bdrv_attach_child(BlockDriverState *parent_bs,
void bdrv_detach_child(BdrvChild *child) void bdrv_detach_child(BdrvChild *child)
{ {
QLIST_REMOVE(child, next); QLIST_REMOVE(child, next);
QLIST_REMOVE(child, next_parent);
g_free(child); g_free(child);
} }
@ -2038,6 +2040,7 @@ static void bdrv_move_reference_fields(BlockDriverState *bs_dest,
/* keep the same entry in bdrv_states */ /* keep the same entry in bdrv_states */
bs_dest->device_list = bs_src->device_list; bs_dest->device_list = bs_src->device_list;
bs_dest->blk = bs_src->blk; bs_dest->blk = bs_src->blk;
bs_dest->parents = bs_src->parents;
memcpy(bs_dest->op_blockers, bs_src->op_blockers, memcpy(bs_dest->op_blockers, bs_src->op_blockers,
sizeof(bs_dest->op_blockers)); sizeof(bs_dest->op_blockers));

2
include/block/block_int.h
View File

@ -339,6 +339,7 @@ struct BdrvChild {
BlockDriverState *bs; BlockDriverState *bs;
const BdrvChildRole *role; const BdrvChildRole *role;
QLIST_ENTRY(BdrvChild) next; QLIST_ENTRY(BdrvChild) next;
QLIST_ENTRY(BdrvChild) next_parent;
}; };
/* /*
@ -445,6 +446,7 @@ struct BlockDriverState {
* parent node of this node. */ * parent node of this node. */
BlockDriverState *inherits_from; BlockDriverState *inherits_from;
QLIST_HEAD(, BdrvChild) children; QLIST_HEAD(, BdrvChild) children;
QLIST_HEAD(, BdrvChild) parents;
QDict *options; QDict *options;
BlockdevDetectZeroesOptions detect_zeroes; BlockdevDetectZeroesOptions detect_zeroes;