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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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7
block/replication.c
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@ -363,6 +363,9 @@ static void reopen_backing_file(BlockDriverState *bs, bool writable,
BdrvChild *hidden_disk, *secondary_disk;
BlockReopenQueue *reopen_queue = NULL;
GLOBAL_STATE_CODE();
GRAPH_RDLOCK_GUARD_MAINLOOP();
/*
* s->hidden_disk and s->secondary_disk may not be set yet, as they will
* only be set after the children are writable.
@ -496,9 +499,11 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
case REPLICATION_MODE_PRIMARY:
break;
case REPLICATION_MODE_SECONDARY:
bdrv_graph_rdlock_main_loop();
active_disk = bs->file;
if (!active_disk || !active_disk->bs || !active_disk->bs->backing) {
error_setg(errp, "Active disk doesn't have backing file");
bdrv_graph_rdunlock_main_loop();
aio_context_release(aio_context);
return;
}
@ -506,11 +511,11 @@ static void replication_start(ReplicationState *rs, ReplicationMode mode,
hidden_disk = active_disk->bs->backing;
if (!hidden_disk->bs || !hidden_disk->bs->backing) {
error_setg(errp, "Hidden disk doesn't have backing file");
bdrv_graph_rdunlock_main_loop();
aio_context_release(aio_context);
return;
}
bdrv_graph_rdlock_main_loop();
secondary_disk = hidden_disk->bs->backing;
if (!secondary_disk->bs || !bdrv_has_blk(secondary_disk->bs)) {
error_setg(errp, "The secondary disk doesn't have block backend");