iomap_seek_hole
offset = iomap_seek_hole(inode, offset, ops);
offset = iomap_seek_hole(inode, offset,
ret = iomap_seek_hole(inode, offset, &gfs2_iomap_ops);
EXPORT_SYMBOL_GPL(iomap_seek_hole);
offset = iomap_seek_hole(inode, offset, &xfs_seek_iomap_ops);
loff_t iomap_seek_hole(struct inode *inode, loff_t offset,