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block: Protect bs->file with graph_lock

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Almost all functions that access bs->file 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: <20231027155333.420094-25-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 17:53:33 +02:00
parent a4b740db5e
commit 1f051dcbdf
15 changed files with 97 additions and 41 deletions
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11
block.c
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@ -1707,12 +1707,14 @@ bdrv_open_driver(BlockDriverState *bs, BlockDriver *drv, const char *node_name,
return 0;
open_failed:
bs->drv = NULL;
bdrv_graph_wrlock(NULL);
if (bs->file != NULL) {
bdrv_graph_wrlock(NULL);
bdrv_unref_child(bs, bs->file);
bdrv_graph_wrunlock();
assert(!bs->file);
}
bdrv_graph_wrunlock();
g_free(bs->opaque);
bs->opaque = NULL;
return ret;
@ -1854,9 +1856,12 @@ static int bdrv_open_common(BlockDriverState *bs, BlockBackend *file,
Error *local_err = NULL;
bool ro;
GLOBAL_STATE_CODE();
bdrv_graph_rdlock_main_loop();
assert(bs->file == NULL);
assert(options != NULL && bs->options != options);
GLOBAL_STATE_CODE();
bdrv_graph_rdunlock_main_loop();
opts = qemu_opts_create(&bdrv_runtime_opts, NULL, 0, &error_abort);
if (!qemu_opts_absorb_qdict(opts, options, errp)) {