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block: Protect bs->children with graph_lock

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Almost all functions that access the child links 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: <20230929145157.45443-22-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2023-09-29 16:51:56 +02:00
parent b59b466071
commit 680e0cc40c
4 changed files with 10 additions and 3 deletions
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4
include/block/block_int-common.h
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@ -1042,7 +1042,7 @@ struct BdrvChild {
*/
bool quiesced_parent;
QLIST_ENTRY(BdrvChild) next;
QLIST_ENTRY(BdrvChild GRAPH_RDLOCK_PTR) next;
QLIST_ENTRY(BdrvChild GRAPH_RDLOCK_PTR) next_parent;
};
@ -1176,7 +1176,7 @@ struct BlockDriverState {
* See also comment in include/block/block.h, to learn how backing and file
* are connected with BdrvChildRole.
*/
QLIST_HEAD(, BdrvChild) children;
QLIST_HEAD(, BdrvChild GRAPH_RDLOCK_PTR) children;
BdrvChild *backing;
BdrvChild *file;