NAME

       systemd-fsck@.service, systemd-fsck-root.service, systemd-fsck - File system checker logic

SYNOPSIS

       systemd-fsck@.service

       systemd-fsck-root.service

       /lib/systemd/systemd-fsck

DESCRIPTION

       systemd-fsck@.service and systemd-fsck-root.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 is responsible for file system checks on the root
       file system, but only if the root filesystem was not checked in the initramfs.
       systemd-fsck@.service is used for all other file systems and for the root file system in
       the initramfs.

       These services are started at boot if passno in /etc/fstab for the file system is set to a
       value greater than zero. 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 (/sbin/fsck.*). This helper will
       decide if the filesystem should actually be checked based on the time since last check,
       number of mounts, unclean unmount, etc.

       If a file system check fails for a service without nofail, emergency mode is activated, by
       isolating to emergency.target.

KERNEL COMMAND LINE

       systemd-fsck understands one kernel command line parameter:

       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.

SEE ALSO

       systemd(1), fsck(8), systemd-quotacheck.service(8), fsck.btrfs(8), fsck.cramfs(8),
       fsck.ext4(8), fsck.fat(8), fsck.hfsplus(8), fsck.minix(8), fsck.ntfs(8), fsck.xfs(8)