shmem_truncate    801 mm/shmem.c     	if (inode->i_op->truncate == shmem_truncate) {
shmem_truncate    805 mm/shmem.c     		shmem_truncate(inode);
shmem_truncate   1979 mm/shmem.c     	.truncate	= shmem_truncate,
shmem_truncate   2404 mm/shmem.c     	.truncate	= shmem_truncate,