Since commit 
8b62f87bad9c ("Btrfs: rework outstanding_extents"),
manual operations of outstanding_extent in btrfs_inode are replaced by
btrfs_mod_outstanding_extents().
The one in cluster_pages_for_defrag seems to be lost, so replace it
of btrfs_mod_outstanding_extents().
Fixes: 8b62f87bad9c ("Btrfs: rework outstanding_extents")
Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
 
        if (i_done != page_cnt) {
                spin_lock(&BTRFS_I(inode)->lock);
-               BTRFS_I(inode)->outstanding_extents++;
+               btrfs_mod_outstanding_extents(BTRFS_I(inode), 1);
                spin_unlock(&BTRFS_I(inode)->lock);
                btrfs_delalloc_release_space(inode, data_reserved,
                                start_index << PAGE_SHIFT,