system crashes before the delayed allocation
blocks are forced to disk.
+noinit_itable Do not initialize any uninitialized inode table
+ blocks in the background. This feature may be
+ used by installation CD's so that the install
+ process can complete as quickly as possible; the
+ inode table initialization process would then be
+ deferred until the next time the file system
+ is unmounted.
+
+init_itable=n The lazy itable init code will wait n times the
+ number of milliseconds it took to zero out the
+ previous block group's inode table. This
+ minimizes the impact on the systme performance
+ while file system's inode table is being initialized.
+
discard Controls whether ext4 should issue discard/TRIM
nodiscard(*) commands to the underlying block device when
blocks are freed. This is useful for SSD devices