Merge tag 'scruball-service-fixes-6.6_2024-01-11' of https://git.kernel.org/pub/scm...

xfs_scrub_all: fixes for systemd services [v28.3 5/6]

This patchset ties up some problems in the xfs_scrub_all program and
service, which are essential for finding mounted filesystems to scrub
and creating the background service instances that do the scrub.

First, we need to fix various errors in pathname escaping, because
systemd does /not/ like slashes in service names.  Then, teach
xfs_scrub_all to deal with systemd restarts causing it to think that a
scrub has finished before the service actually finishes.  Finally,
implement a signal handler so that SIGINT (console ^C) and SIGTERM
(systemd stopping the service) shut down the xfs_scrub@ services
correctly.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>