btrfs: rename cow_file_range_async to run_delalloc_compressed

cow_file_range_async is only used for compressed writeback.  Rename it
to run_delalloc_compressed, which also fits in with run_delalloc_nocow
and run_delalloc_zoned.
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/inode.c

@@ -1693,7 +1693,7 @@ static noinline void async_cow_submit(struct btrfs_work *work)
 	 * ->inode could be NULL if async_chunk_start has failed to compress,
 	 * in which case we don't have anything to submit, yet we need to
 	 * always adjust ->async_delalloc_pages as its paired with the init
-	 * happening in cow_file_range_async
+	 * happening in run_delalloc_compressed
 	 */
 	if (async_chunk->inode)
 		submit_compressed_extents(async_chunk);
@@ -1720,7 +1720,7 @@ static noinline void async_cow_free(struct btrfs_work *work)
 		kvfree(async_cow);
 }
 
-static bool cow_file_range_async(struct btrfs_inode *inode,
+static bool run_delalloc_compressed(struct btrfs_inode *inode,
 				    struct writeback_control *wbc,
 				    struct page *locked_page,
 				    u64 start, u64 end, int *page_started,
@@ -2417,7 +2417,7 @@ int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct page *locked_page
 
 	if (btrfs_inode_can_compress(inode) &&
 	    inode_need_compress(inode, start, end) &&
-	    cow_file_range_async(inode, wbc, locked_page, start,
+	    run_delalloc_compressed(inode, wbc, locked_page, start,
 				    end, page_started, nr_written))
 		goto out;