btrfs: Replace fs_info->delalloc_workers with btrfs_workqueue

Much like the fs_info->workers, replace the fs_info->delalloc_workers
use the same 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

@@ -1506,7 +1506,7 @@ struct btrfs_fs_info {
 	 */
 	struct btrfs_workers generic_worker;
 	struct btrfs_workqueue_struct *workers;
-	struct btrfs_workers delalloc_workers;
+	struct btrfs_workqueue_struct *delalloc_workers;
 	struct btrfs_workers flush_workers;
 	struct btrfs_workers endio_workers;
 	struct btrfs_workers endio_meta_workers;

fs/btrfs/disk-io.c

@@ -1997,7 +1997,7 @@ static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
 {
 	btrfs_stop_workers(&fs_info->generic_worker);
 	btrfs_stop_workers(&fs_info->fixup_workers);
-	btrfs_stop_workers(&fs_info->delalloc_workers);
+	btrfs_destroy_workqueue(fs_info->delalloc_workers);
 	btrfs_destroy_workqueue(fs_info->workers);
 	btrfs_stop_workers(&fs_info->endio_workers);
 	btrfs_stop_workers(&fs_info->endio_meta_workers);
@@ -2480,8 +2480,8 @@ int open_ctree(struct super_block *sb,
 		btrfs_alloc_workqueue("worker", flags | WQ_HIGHPRI,
 				      max_active, 16);
 
-	btrfs_init_workers(&fs_info->delalloc_workers, "delalloc",
-			   fs_info->thread_pool_size, NULL);
+	fs_info->delalloc_workers =
+		btrfs_alloc_workqueue("delalloc", flags, max_active, 2);
 
 	btrfs_init_workers(&fs_info->flush_workers, "flush_delalloc",
 			   fs_info->thread_pool_size, NULL);
@@ -2499,9 +2499,6 @@ int open_ctree(struct super_block *sb,
 	 */
 	fs_info->submit_workers.idle_thresh = 64;
 
-	fs_info->delalloc_workers.idle_thresh = 2;
-	fs_info->delalloc_workers.ordered = 1;
-
 	btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1,
 			   &fs_info->generic_worker);
 	btrfs_init_workers(&fs_info->endio_workers, "endio",
@@ -2552,7 +2549,6 @@ int open_ctree(struct super_block *sb,
 	 */
 	ret = btrfs_start_workers(&fs_info->generic_worker);
 	ret |= btrfs_start_workers(&fs_info->submit_workers);
-	ret |= btrfs_start_workers(&fs_info->delalloc_workers);
 	ret |= btrfs_start_workers(&fs_info->fixup_workers);
 	ret |= btrfs_start_workers(&fs_info->endio_workers);
 	ret |= btrfs_start_workers(&fs_info->endio_meta_workers);
@@ -2570,7 +2566,7 @@ int open_ctree(struct super_block *sb,
 		err = -ENOMEM;
 		goto fail_sb_buffer;
 	}
-	if (!(fs_info->workers)) {
+	if (!(fs_info->workers && fs_info->delalloc_workers)) {
 		err = -ENOMEM;
 		goto fail_sb_buffer;
 	}

fs/btrfs/inode.c

@@ -324,7 +324,7 @@ struct async_cow {
 	u64 start;
 	u64 end;
 	struct list_head extents;
-	struct btrfs_work work;
+	struct btrfs_work_struct work;
 };
 
 static noinline int add_async_extent(struct async_cow *cow,
@@ -1000,7 +1000,7 @@ static noinline int cow_file_range(struct inode *inode,
 /*
  * work queue call back to started compression on a file and pages
  */
-static noinline void async_cow_start(struct btrfs_work *work)
+static noinline void async_cow_start(struct btrfs_work_struct *work)
 {
 	struct async_cow *async_cow;
 	int num_added = 0;
@@ -1018,7 +1018,7 @@ static noinline void async_cow_start(struct btrfs_work *work)
 /*
  * work queue call back to submit previously compressed pages
  */
-static noinline void async_cow_submit(struct btrfs_work *work)
+static noinline void async_cow_submit(struct btrfs_work_struct *work)
 {
 	struct async_cow *async_cow;
 	struct btrfs_root *root;
@@ -1039,7 +1039,7 @@ static noinline void async_cow_submit(struct btrfs_work *work)
 		submit_compressed_extents(async_cow->inode, async_cow);
 }
 
-static noinline void async_cow_free(struct btrfs_work *work)
+static noinline void async_cow_free(struct btrfs_work_struct *work)
 {
 	struct async_cow *async_cow;
 	async_cow = container_of(work, struct async_cow, work);
@@ -1076,16 +1076,14 @@ static int cow_file_range_async(struct inode *inode, struct page *locked_page,
 		async_cow->end = cur_end;
 		INIT_LIST_HEAD(&async_cow->extents);
 
-		async_cow->work.func = async_cow_start;
-		async_cow->work.ordered_func = async_cow_submit;
-		async_cow->work.ordered_free = async_cow_free;
-		async_cow->work.flags = 0;
+		btrfs_init_work(&async_cow->work, async_cow_start,
+				async_cow_submit, async_cow_free);
 
 		nr_pages = (cur_end - start + PAGE_CACHE_SIZE) >>
 			PAGE_CACHE_SHIFT;
 		atomic_add(nr_pages, &root->fs_info->async_delalloc_pages);
 
-		btrfs_queue_worker(&root->fs_info->delalloc_workers,
+		btrfs_queue_work(root->fs_info->delalloc_workers,
 				 &async_cow->work);
 
 		if (atomic_read(&root->fs_info->async_delalloc_pages) > limit) {

fs/btrfs/super.c

@@ -1325,7 +1325,7 @@ static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
 
 	btrfs_set_max_workers(&fs_info->generic_worker, new_pool_size);
 	btrfs_workqueue_set_max(fs_info->workers, new_pool_size);
-	btrfs_set_max_workers(&fs_info->delalloc_workers, new_pool_size);
+	btrfs_workqueue_set_max(fs_info->delalloc_workers, new_pool_size);
 	btrfs_set_max_workers(&fs_info->submit_workers, new_pool_size);
 	btrfs_set_max_workers(&fs_info->caching_workers, new_pool_size);
 	btrfs_set_max_workers(&fs_info->fixup_workers, new_pool_size);