block: remove bdrv_co_lock()

The bdrv_co_lock() and bdrv_co_unlock() functions are already no-ops.
Remove them.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20231205182011.1976568-8-stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block.c

@@ -7431,16 +7431,6 @@ void coroutine_fn bdrv_co_leave(BlockDriverState *bs, AioContext *old_ctx)
     bdrv_dec_in_flight(bs);
 }
 
-void coroutine_fn bdrv_co_lock(BlockDriverState *bs)
-{
-    /* TODO removed in next patch */
-}
-
-void coroutine_fn bdrv_co_unlock(BlockDriverState *bs)
-{
-    /* TODO removed in next patch */
-}
-
 static void bdrv_do_remove_aio_context_notifier(BdrvAioNotifier *ban)
 {
     GLOBAL_STATE_CODE();

blockdev.c

@@ -2264,18 +2264,13 @@ void coroutine_fn qmp_block_resize(const char *device, const char *node_name,
         return;
     }
 
-    bdrv_co_lock(bs);
     bdrv_drained_begin(bs);
-    bdrv_co_unlock(bs);
 
     old_ctx = bdrv_co_enter(bs);
     blk_co_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp);
     bdrv_co_leave(bs, old_ctx);
 
-    bdrv_co_lock(bs);
     bdrv_drained_end(bs);
-    bdrv_co_unlock(bs);
-
     blk_co_unref(blk);
 }
 

include/block/block-global-state.h

@@ -267,20 +267,6 @@ int bdrv_debug_remove_breakpoint(BlockDriverState *bs, const char *tag);
 int bdrv_debug_resume(BlockDriverState *bs, const char *tag);
 bool bdrv_debug_is_suspended(BlockDriverState *bs, const char *tag);
 
-/**
- * Locks the AioContext of @bs if it's not the current AioContext. This avoids
- * double locking which could lead to deadlocks: This is a coroutine_fn, so we
- * know we already own the lock of the current AioContext.
- *
- * May only be called in the main thread.
- */
-void coroutine_fn bdrv_co_lock(BlockDriverState *bs);
-
-/**
- * Unlocks the AioContext of @bs if it's not the current AioContext.
- */
-void coroutine_fn bdrv_co_unlock(BlockDriverState *bs);
-
 bool bdrv_child_change_aio_context(BdrvChild *c, AioContext *ctx,
                                    GHashTable *visited, Transaction *tran,
                                    Error **errp);