btrfs: add comment about locking to btrfs_split_ordered_extent()
There are subtle details about why the root's ordered_extent_lock is held, so add a comment mentioning them. Reviewed-by:Josef Bacik <josef@toxicpanda.com> Reviewed-by:
Qu Wenruo <wqu@suse.com> Reviewed-by:
Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by:
Filipe Manana <fdmanana@suse.com> Reviewed-by:
David Sterba <dsterba@suse.com> Signed-off-by:
David Sterba <dsterba@suse.com>
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