motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-02 23:33:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

block: Mark bdrv_first_blk() and bdrv_is_root_node() GRAPH_RDLOCK

Browse source 
This adds GRAPH_RDLOCK annotations to declare that callers of
bdrv_first_blk() and bdrv_is_root_node() need to hold a reader lock
for the graph. These functions are the only functions in block-backend.c
that access the parent list of a node.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20230929145157.45443-5-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 16:51:39 +02:00
parent 0e6bad1f21
commit 2b3912f135
14 changed files with 53 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

6
block/block-backend.c
View file

@ -780,11 +780,12 @@ BlockDriverState *blk_bs(BlockBackend *blk)
return blk->root ? blk->root->bs : NULL;
}
static BlockBackend *bdrv_first_blk(BlockDriverState *bs)
static BlockBackend * GRAPH_RDLOCK bdrv_first_blk(BlockDriverState *bs)
{
BdrvChild *child;
GLOBAL_STATE_CODE();
assert_bdrv_graph_readable();
QLIST_FOREACH(child, &bs->parents, next_parent) {
if (child->klass == &child_root) {
@ -812,6 +813,8 @@ bool bdrv_is_root_node(BlockDriverState *bs)
BdrvChild *c;
GLOBAL_STATE_CODE();
assert_bdrv_graph_readable();
QLIST_FOREACH(c, &bs->parents, next_parent) {
if (c->klass != &child_root) {
return false;
@ -2259,6 +2262,7 @@ void blk_activate(BlockBackend *blk, Error **errp)
if (qemu_in_coroutine()) {
bdrv_co_activate(bs, errp);
} else {
GRAPH_RDLOCK_GUARD_MAINLOOP();
bdrv_activate(bs, errp);
}
}