diff options
Diffstat (limited to 'block.c')
| -rw-r--r-- | block.c | 31 |
1 files changed, 18 insertions, 13 deletions
diff --git a/block.c b/block.c index 5f92eb4950..a6060eddbc 100644 --- a/block.c +++ b/block.c @@ -5435,17 +5435,6 @@ static int bdrv_replace_node_common(BlockDriverState *from, GLOBAL_STATE_CODE(); - if (detach_subchain) { - assert(bdrv_chain_contains(from, to)); - assert(from != to); - for (to_cow_parent = from; - bdrv_filter_or_cow_bs(to_cow_parent) != to; - to_cow_parent = bdrv_filter_or_cow_bs(to_cow_parent)) - { - ; - } - } - /* Make sure that @from doesn't go away until we have successfully attached * all of its parents to @to. */ bdrv_ref(from); @@ -5457,6 +5446,17 @@ static int bdrv_replace_node_common(BlockDriverState *from, bdrv_graph_wrlock(to); + if (detach_subchain) { + assert(bdrv_chain_contains(from, to)); + assert(from != to); + for (to_cow_parent = from; + bdrv_filter_or_cow_bs(to_cow_parent) != to; + to_cow_parent = bdrv_filter_or_cow_bs(to_cow_parent)) + { + ; + } + } + /* * Do the replacement without permission update. * Replacement may influence the permissions, we should calculate new @@ -5504,10 +5504,14 @@ int bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, int bdrv_drop_filter(BlockDriverState *bs, Error **errp) { + BlockDriverState *child_bs; + GLOBAL_STATE_CODE(); + bdrv_graph_rdlock_main_loop(); + child_bs = bdrv_filter_or_cow_bs(bs); + bdrv_graph_rdunlock_main_loop(); - return bdrv_replace_node_common(bs, bdrv_filter_or_cow_bs(bs), true, true, - errp); + return bdrv_replace_node_common(bs, child_bs, true, true, errp); } /* @@ -6509,6 +6513,7 @@ bool bdrv_chain_contains(BlockDriverState *top, BlockDriverState *base) { GLOBAL_STATE_CODE(); + GRAPH_RDLOCK_GUARD_MAINLOOP(); while (top && top != base) { top = bdrv_filter_or_cow_bs(top); |