UMOUNT_DISCARD_TIMEOUT
f2fs_update_time(sbi, UMOUNT_DISCARD_TIMEOUT);
f2fs_time_over(sbi, UMOUNT_DISCARD_TIMEOUT))
f2fs_time_over(sbi, UMOUNT_DISCARD_TIMEOUT))
sbi->interval_time[UMOUNT_DISCARD_TIMEOUT] =
F2FS_SBI_RW_ATTR(umount_discard_timeout, interval_time[UMOUNT_DISCARD_TIMEOUT]);