systemd systemd-fsck@.service 8 systemd-fsck@.service systemd-fsck-root.service systemd-fsck-usr.service systemd-fsck File system checker logic systemd-fsck@.service systemd-fsck-root.service systemd-fsck-usr.service /usr/lib/systemd/systemd-fsck systemd-fsck@.service, systemd-fsck-root.service, and systemd-fsck-usr.service are services responsible for file system checks. They are instantiated for each device that is configured for file system checking. systemd-fsck-root.service and systemd-fsck-usr.service are responsible for file system checks on the root and /usr file system, respectively, but only if the root filesystem was not checked in the initrd. systemd-fsck@.service is used for all other file systems and for the root file system in the initrd. These services are started at boot if passno in /etc/fstab for the file system is set to a value greater than zero, but only if it is also configured to be mounted at boot (i.e. without noauto option). The file system check for root is performed before the other file systems. Other file systems may be checked in parallel, except when they are on the same rotating disk. systemd-fsck does not know any details about specific filesystems, and simply executes file system checkers specific to each filesystem type (fsck.type). These checkers will decide if the filesystem should actually be checked based on the time since last check, number of mounts, unclean unmount, etc. systemd-fsck-root.service and systemd-fsck-usr.service will activate reboot.target if fsck returns the "System should reboot" condition, or emergency.target if fsck returns the "Filesystem errors left uncorrected" condition. systemd-fsck@.service will fail if fsck returns with either "System should reboot" or "Filesystem errors left uncorrected" conditions. For filesystems listed in /etc/fstab without nofail or noauto options, local-fs.target will then activate emergency.target. systemd-fsck understands these kernel command line parameters: fsck.mode= One of auto, force, skip. Controls the mode of operation. The default is auto, and ensures that file system checks are done when the file system checker deems them necessary. force unconditionally results in full file system checks. skip skips any file system checks. fsck.repair= One of preen, yes, no. Controls the mode of operation. The default is preen, and will automatically repair problems that can be safely fixed. yes will answer yes to all questions by fsck and no will answer no to all questions. systemd1, fsck8, systemd-quotacheck.service8, fsck.btrfs8, fsck.cramfs8, fsck.ext48, fsck.fat8, fsck.hfsplus8, fsck.minix8, fsck.ntfs8, fsck.xfs8