shmem_truncate_range  990 mm/shmem.c     void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend)
shmem_truncate_range 4079 mm/shmem.c     void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend)