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block: Protect bs->backing with graph_lock

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Almost all functions that access bs->backing already take the graph
lock now. Add locking to the remaining users and finally annotate the
struct field itself as protected by the graph lock.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20231027155333.420094-18-kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-10-27 17:53:26 +02:00
parent ccd6a37947
commit 004915a96a
9 changed files with 70 additions and 27 deletions
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2
include/block/block_int-common.h
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@ -1178,7 +1178,7 @@ struct BlockDriverState {
* are connected with BdrvChildRole.
*/
QLIST_HEAD(, BdrvChild GRAPH_RDLOCK_PTR) children;
BdrvChild *backing;
BdrvChild * GRAPH_RDLOCK_PTR backing;
BdrvChild *file;
QLIST_HEAD(, BdrvChild GRAPH_RDLOCK_PTR) parents;