ext4_ext_remove_space
extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
err = ext4_ext_remove_space(inode, last_block, EXT_MAX_BLOCKS - 1);
ret = ext4_ext_remove_space(inode, start_lblk, end_lblk - 1);
ret = ext4_ext_remove_space(inode, le32_to_cpu(lrange.fc_lblk),
ret = ext4_ext_remove_space(inode, start_lblk,
TRACE_EVENT(ext4_ext_remove_space,