block: Add BlockBackend.ctx

This adds a new parameter to blk_new() which requires its callers to
declare from which AioContext this BlockBackend is going to be used (or
the locks of which AioContext need to be taken anyway).

The given context is only stored and kept up to date when changing
AioContexts. Actually applying the stored AioContext to the root node
is saved for another commit.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/hmp.c b/hmp.c
index 56a3ed7375..be5e345c6f 100644
--- a/hmp.c
+++ b/hmp.c
@@ -2560,7 +2560,8 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict)
     if (!blk) {
         BlockDriverState *bs = bdrv_lookup_bs(NULL, device, &err);
         if (bs) {
-            blk = local_blk = blk_new(0, BLK_PERM_ALL);
+            blk = local_blk = blk_new(bdrv_get_aio_context(bs),
+                                      0, BLK_PERM_ALL);
             ret = blk_insert_bs(blk, bs, &err);
             if (ret < 0) {
                 goto fail;