include/block/block_int: split header into I/O and global state API

Similarly to the previous patch, split block_int.h
in block_int-io.h and block_int-global-state.h

block_int-common.h contains the structures shared between
the two headers, and the functions that can't be categorized as
I/O or global state.

Assertions are added in the next patch.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20220303151616.325444-12-eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

blockdev.c

@@ -63,6 +63,7 @@
 #include "qemu/main-loop.h"
 #include "qemu/throttle-options.h"
 
+/* Protected by BQL */
 QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
     QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
 
@@ -1175,6 +1176,8 @@ typedef struct BlkActionState BlkActionState;
  *
  * Only prepare() may fail. In a single transaction, only one of commit() or
  * abort() will be called. clean() will always be called if it is present.
+ *
+ * Always run under BQL.
  */
 typedef struct BlkActionOps {
     size_t instance_size;
@@ -2284,6 +2287,8 @@ static TransactionProperties *get_transaction_properties(
 /*
  * 'Atomic' group operations.  The operations are performed as a set, and if
  * any fail then we roll back all operations in the group.
+ *
+ * Always run under BQL.
  */
 void qmp_transaction(TransactionActionList *dev_list,
                      bool has_props,