Pull btrfs fixes from David Sterba:
 "Two regression fixes and one fix for stable"

* tag 'for-4.17-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  Btrfs: send, fix missing truncate for inode with prealloc extent past eof
  btrfs: Take trans lock before access running trans in check_delayed_ref
  btrfs: Fix wrong first_key parameter in replace_path