shmem_truncate_range
shmem_truncate_range(inode, PFN_PHYS(page_index), PFN_PHYS(page_index) + PAGE_SIZE - 1);
shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1);
shmem_truncate_range(file_inode(obj->base.filp), 0, (loff_t)-1);
shmem_truncate_range(file_inode(i915_tt->filp),
shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1);
shmem_truncate_range(file_inode(backup), start,
shmem_truncate_range(file_inode(xf->file), pos, pos + count - 1);
shmem_truncate_range(inode, pos, pos + BBTOB(bp->b_length) - 1);
void shmem_truncate_range(struct inode *inode, loff_t start, uoff_t end);
EXPORT_SYMBOL_GPL(shmem_truncate_range);
shmem_truncate_range(inode,
shmem_truncate_range(inode, 0, (loff_t)-1);
shmem_truncate_range(inode, offset, offset + len - 1);
EXPORT_SYMBOL_GPL(shmem_truncate_range);