diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 0e8d31274c92733af7ea1de54fb61bdcb0bf888c..8d03e4a3c4e934a876f390f609599e3bf2bc6889 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -538,15 +538,9 @@ int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
 	async->work.flags = 0;
 	async->bio_flags = bio_flags;
 
-	while(atomic_read(&fs_info->async_submit_draining) &&
-	      atomic_read(&fs_info->nr_async_submits)) {
-		wait_event(fs_info->async_submit_wait,
-			   (atomic_read(&fs_info->nr_async_submits) == 0));
-	}
-
 	atomic_inc(&fs_info->nr_async_submits);
 	btrfs_queue_worker(&fs_info->workers, &async->work);
-
+#if 0
 	if (atomic_read(&fs_info->nr_async_submits) > limit) {
 		wait_event_timeout(fs_info->async_submit_wait,
 			   (atomic_read(&fs_info->nr_async_submits) < limit),
@@ -556,7 +550,7 @@ int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
 			   (atomic_read(&fs_info->nr_async_bios) < limit),
 			   HZ/10);
 	}
-
+#endif
 	while(atomic_read(&fs_info->async_submit_draining) &&
 	      atomic_read(&fs_info->nr_async_submits)) {
 		wait_event(fs_info->async_submit_wait,
@@ -1765,11 +1759,11 @@ struct btrfs_root *open_ctree(struct super_block *sb,
 	ret = btrfs_cleanup_reloc_trees(tree_root);
 	BUG_ON(ret);
 
+read_fs_root:
 	location.objectid = BTRFS_FS_TREE_OBJECTID;
 	location.type = BTRFS_ROOT_ITEM_KEY;
 	location.offset = (u64)-1;
 
-read_fs_root:
 	fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
 	if (!fs_info->fs_root)
 		goto fail_cleaner;
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 54d013c3bb883eacd3528d295978b9bb80e9583e..a0f3804efe4f36e46ebaa4a1fe1ac5d0b0ca9153 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2398,7 +2398,8 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
 int extent_write_cache_pages(struct extent_io_tree *tree,
 			     struct address_space *mapping,
 			     struct writeback_control *wbc,
-			     writepage_t writepage, void *data)
+			     writepage_t writepage, void *data,
+			     void (*flush_fn)(void *))
 {
 	struct backing_dev_info *bdi = mapping->backing_dev_info;
 	int ret = 0;
@@ -2460,8 +2461,10 @@ int extent_write_cache_pages(struct extent_io_tree *tree,
 				continue;
 			}
 
-			if (wbc->sync_mode != WB_SYNC_NONE)
+			if (wbc->sync_mode != WB_SYNC_NONE) {
+				flush_fn(data);
 				wait_on_page_writeback(page);
+			}
 
 			if (PageWriteback(page) ||
 			    !clear_page_dirty_for_io(page)) {
@@ -2498,6 +2501,15 @@ int extent_write_cache_pages(struct extent_io_tree *tree,
 }
 EXPORT_SYMBOL(extent_write_cache_pages);
 
+static noinline void flush_write_bio(void *data)
+{
+	struct extent_page_data *epd = data;
+	if (epd->bio) {
+		submit_one_bio(WRITE, epd->bio, 0, 0);
+		epd->bio = NULL;
+	}
+}
+
 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 			  get_extent_t *get_extent,
 			  struct writeback_control *wbc)
@@ -2523,7 +2535,7 @@ int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
 	ret = __extent_writepage(page, wbc, &epd);
 
 	extent_write_cache_pages(tree, mapping, &wbc_writepages,
-				 __extent_writepage, &epd);
+				 __extent_writepage, &epd, flush_write_bio);
 	if (epd.bio) {
 		submit_one_bio(WRITE, epd.bio, 0, 0);
 	}
@@ -2592,7 +2604,8 @@ int extent_writepages(struct extent_io_tree *tree,
 	};
 
 	ret = extent_write_cache_pages(tree, mapping, wbc,
-				       __extent_writepage, &epd);
+				       __extent_writepage, &epd,
+				       flush_write_bio);
 	if (epd.bio) {
 		submit_one_bio(WRITE, epd.bio, 0, 0);
 	}
@@ -3087,6 +3100,9 @@ int clear_extent_buffer_dirty(struct extent_io_tree *tree,
 
 	for (i = 0; i < num_pages; i++) {
 		page = extent_buffer_page(eb, i);
+		if (!set && !PageDirty(page))
+			continue;
+
 		lock_page(page);
 		if (i == 0)
 			set_page_extent_head(page, eb->len);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 6854bf41856ab52982e1b4af2a16529ef681a45a..806caacff86c79d12f74dfbf80d7e9e1c0f5298b 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -883,13 +883,6 @@ static int cow_file_range_async(struct inode *inode, struct page *locked_page,
 		async_cow->work.ordered_free = async_cow_free;
 		async_cow->work.flags = 0;
 
-		while(atomic_read(&root->fs_info->async_submit_draining) &&
-		      atomic_read(&root->fs_info->async_delalloc_pages)) {
-			wait_event(root->fs_info->async_submit_wait,
-			     (atomic_read(&root->fs_info->async_delalloc_pages)
-			      == 0));
-		}
-
 		nr_pages = (cur_end - start + PAGE_CACHE_SIZE) >>
 			PAGE_CACHE_SHIFT;
 		atomic_add(nr_pages, &root->fs_info->async_delalloc_pages);