raw-format: Fix open with 'file' in iothread

When opening the 'file' child moves bs to an iothread, we need to hold
the AioContext lock of it before we can call raw_apply_options() (and
more specifically, bdrv_getlength() inside of it).

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20230525124713.401149-8-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/block/raw-format.c b/block/raw-format.c
index 918fe4fb7e..e4f35268e6 100644
--- a/block/raw-format.c
+++ b/block/raw-format.c
@@ -468,6 +468,7 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
                     Error **errp)
 {
     BDRVRawState *s = bs->opaque;
+    AioContext *ctx;
     bool has_size;
     uint64_t offset, size;
     BdrvChildRole file_role;
@@ -515,7 +516,11 @@ static int raw_open(BlockDriverState *bs, QDict *options, int flags,
                 bs->file->bs->filename);
     }
 
+    ctx = bdrv_get_aio_context(bs);
+    aio_context_acquire(ctx);
     ret = raw_apply_options(bs, s, offset, has_size, size, errp);
+    aio_context_release(ctx);
+
     if (ret < 0) {
         return ret;
     }