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block: Protect bs->children with graph_lock 

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>
master
Kevin Wolf 2023-09-29 16:51:56 +02:00
parent b59b466071
commit 680e0cc40c
4 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
block.c
View File

@ -2973,6 +2973,8 @@ static void bdrv_child_free(BdrvChild *child)
{
assert(!child->bs);
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
assert(!child->next.le_prev); /* not in children list */
g_free(child->name);

3
block/replication.c
View File

@ -430,7 +430,8 @@ static void backup_job_completed(void *opaque, int ret)
backup_job_cleanup(bs);
}
static bool check_top_bs(BlockDriverState *top_bs, BlockDriverState *bs)
static bool GRAPH_RDLOCK
check_top_bs(BlockDriverState *top_bs, BlockDriverState *bs)
{
BdrvChild *child;

4
include/block/block_int-common.h
View File

@ -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;

4
tests/unit/test-bdrv-drain.c
View File

@ -1034,9 +1034,13 @@ static void coroutine_fn test_co_delete_by_drain(void *opaque)
blk_co_unref(blk);
} else {
BdrvChild *c, *next_c;
bdrv_graph_co_rdlock();
QLIST_FOREACH_SAFE(c, &bs->children, next, next_c) {
bdrv_graph_co_rdunlock();
bdrv_co_unref_child(bs, c);
bdrv_graph_co_rdlock();
}
bdrv_graph_co_rdunlock();
}
dbdd->done = true;