systemd-fsck@.service, systemd-fsck-root.service, systemd-fsck — File system checker logic
services responsible for file system checks. They are
instantiated for each device that is configured for
file system checking.
responsible for file system checks on the root file
system, but in only if the root filesystem wasn't
checked in the initramfs.
systemd-fsck@.service is used for
all other file systems and for the root file system in
Those services are started at boot for the root
file system or when
/etc/fstab for the file system is
set to a value greater than zero, except for file
system types like btrfs and xfs which are checked by
the kernel. The check for root is performed before the
other file systems. Other file systems may be checked
in parallel, except when they are one the same
systemd-fsck does not know
any details about specific filesystems, and simply
executes file system checkers specific to each
filesystem type (
This helper will decide if the filesystem should
actually be checked based on the time since last
check, number of mounts, unclean unmount, etc.
systemd-fsck will forward
file system checking progress to the console. If a
file system check fails for a service without
nofail, emergency mode is activated,
by isolating to
one kernel command line parameter:
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
unconditionally results in full file
system checks. "
skips any file system
no". Controls the
mode of operation. The default is "
preen", and will automatically repair
problems that can be safely fixed. "
" will answer yes to all questions by
fsck and "
no" will answer no to