LFS_IS_MALLOC_BUF
KASSERT(flags & BW_CLEAN || !LFS_IS_MALLOC_BUF(bp));
if (LFS_IS_MALLOC_BUF(bp))
return LFS_IS_MALLOC_BUF(bp);
if (tbp->b_iodone != NULL && !LFS_IS_MALLOC_BUF(tbp)) {