btrfs: Replace fs_info->delayed_workers workqueue with btrfs_workqueue.

Replace the fs_info->delayed_workers with the newly created
btrfs_workqueue.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Tested-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fb.com>

fs/btrfs/ctree.h

@@ -1525,7 +1525,7 @@ struct btrfs_fs_info {
 	 * for the sys_munmap function call path
 	 */
 	struct btrfs_workqueue_struct *fixup_workers;
-	struct btrfs_workers delayed_workers;
+	struct btrfs_workqueue_struct *delayed_workers;
 	struct task_struct *transaction_kthread;
 	struct task_struct *cleaner_kthread;
 	int thread_pool_size;

fs/btrfs/delayed-inode.c

@@ -1318,10 +1318,10 @@ void btrfs_remove_delayed_node(struct inode *inode)
 struct btrfs_async_delayed_work {
 	struct btrfs_delayed_root *delayed_root;
 	int nr;
-	struct btrfs_work work;
+	struct btrfs_work_struct work;
 };
 
-static void btrfs_async_run_delayed_root(struct btrfs_work *work)
+static void btrfs_async_run_delayed_root(struct btrfs_work_struct *work)
 {
 	struct btrfs_async_delayed_work *async_work;
 	struct btrfs_delayed_root *delayed_root;
@@ -1392,11 +1392,11 @@ static int btrfs_wq_run_delayed_node(struct btrfs_delayed_root *delayed_root,
 		return -ENOMEM;
 
 	async_work->delayed_root = delayed_root;
-	async_work->work.func = btrfs_async_run_delayed_root;
-	async_work->work.flags = 0;
+	btrfs_init_work(&async_work->work, btrfs_async_run_delayed_root,
+			NULL, NULL);
 	async_work->nr = nr;
 
-	btrfs_queue_worker(&root->fs_info->delayed_workers, &async_work->work);
+	btrfs_queue_work(root->fs_info->delayed_workers, &async_work->work);
 	return 0;
 }
 

fs/btrfs/disk-io.c

@@ -2006,7 +2006,7 @@ static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
 	btrfs_destroy_workqueue(fs_info->endio_write_workers);
 	btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
 	btrfs_destroy_workqueue(fs_info->submit_workers);
-	btrfs_stop_workers(&fs_info->delayed_workers);
+	btrfs_destroy_workqueue(fs_info->delayed_workers);
 	btrfs_destroy_workqueue(fs_info->caching_workers);
 	btrfs_destroy_workqueue(fs_info->readahead_workers);
 	btrfs_destroy_workqueue(fs_info->flush_workers);
@@ -2519,9 +2519,8 @@ int open_ctree(struct super_block *sb,
 		btrfs_alloc_workqueue("endio-write", flags, max_active, 2);
 	fs_info->endio_freespace_worker =
 		btrfs_alloc_workqueue("freespace-write", flags, max_active, 0);
-	btrfs_init_workers(&fs_info->delayed_workers, "delayed-meta",
-			   fs_info->thread_pool_size,
-			   &fs_info->generic_worker);
+	fs_info->delayed_workers =
+		btrfs_alloc_workqueue("delayed-meta", flags, max_active, 0);
 	fs_info->readahead_workers =
 		btrfs_alloc_workqueue("readahead", flags, max_active, 2);
 	btrfs_init_workers(&fs_info->qgroup_rescan_workers, "qgroup-rescan", 1,
@@ -2532,7 +2531,6 @@ int open_ctree(struct super_block *sb,
 	 * return -ENOMEM if any of these fail.
 	 */
 	ret = btrfs_start_workers(&fs_info->generic_worker);
-	ret |= btrfs_start_workers(&fs_info->delayed_workers);
 	ret |= btrfs_start_workers(&fs_info->qgroup_rescan_workers);
 	if (ret) {
 		err = -ENOMEM;
@@ -2545,7 +2543,7 @@ int open_ctree(struct super_block *sb,
 	      fs_info->endio_write_workers && fs_info->endio_raid56_workers &&
 	      fs_info->endio_freespace_worker && fs_info->rmw_workers &&
 	      fs_info->caching_workers && fs_info->readahead_workers &&
-	      fs_info->fixup_workers)) {
+	      fs_info->fixup_workers && fs_info->delayed_workers)) {
 		err = -ENOMEM;
 		goto fail_sb_buffer;
 	}

fs/btrfs/super.c

@@ -1334,7 +1334,7 @@ static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
 				new_pool_size);
 	btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size);
 	btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size);
-	btrfs_set_max_workers(&fs_info->delayed_workers, new_pool_size);
+	btrfs_workqueue_set_max(fs_info->delayed_workers, new_pool_size);
 	btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size);
 	btrfs_set_max_workers(&fs_info->scrub_wr_completion_workers,
 			      new_pool_size);