* IO engine that does regular fallocate to simulate data transfer
* as fio ioengine.
* DDIR_READ does fallocate(,mode = FALLOC_FL_KEEP_SIZE,)
- * DDIR_WRITE does fallocate(,mode = 0) : fallocate with size extention
+ * DDIR_WRITE does fallocate(,mode = 0) : fallocate with size extension
* DDIR_TRIM does fallocate(,mode = FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)
*
*/