On Tue, 28 Jul 2020 at 11:11, Lennart Poettering <mzerq...@0pointer.de>
wrote:
[..]
> > Why is it still automonter hardcoded into the kernel even if it is
> > completely useless on a typical single workstation?
>
> binfmt_misc is mounted with that by default.
>
> And systemd will mount the ESP and the boot loader partition with the
> automounter by default, so that it's only mounted on access and
> quickly unmounted again afterwards, to ensure it stays in a clean
> state whenever possible. (This logic is turned off if these mounts are
> explicitly listed in fstab tough, unfortunately fedora does that).
>
So .. someone knows why it cannot be mounted on "mount -a" when entry
for binfmt_misc would be in fstab or even over .mount unit?
$ rpm -ql systemd | grep proc-sys; echo; systemctl status
proc-sys-fs-binfmt_misc.mount
proc-sys-fs-binfmt_misc.mount/usr/lib/systemd/system/proc-sys-fs-binfmt_misc.automount
/usr/lib/systemd/system/proc-sys-fs-binfmt_misc.mount
/usr/lib/systemd/system/sysinit.target.wants/proc-sys-fs-binfmt_misc.automount
● proc-sys-fs-binfmt_misc.mount - Arbitrary Executable File Formats File
System
Loaded: loaded (/proc/self/mountinfo; disabled; vendor preset:
disabled)
Active: active (mounted) since Thu 2020-07-23 18:36:17 BST; 4 days ago
TriggeredBy: ● proc-sys-fs-binfmt_misc.automount
Where: /proc/sys/fs/binfmt_misc
What: binfmt_misc
Docs:
https://www.kernel.org/doc/html/latest/admin-guide/binfmt-misc.html
https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
Tasks: 0 (limit: 154244)
Memory: 188.0K
CPU: 12ms
CGroup: /system.slice/proc-sys-fs-binfmt_misc.mount
● proc-sys-fs-binfmt_misc.mount - Arbitrary Executable File Formats File
System
Loaded: loaded (/proc/self/mountinfo; disabled; vendor preset:
disabled)
Active: active (mounted) since Thu 2020-07-23 18:36:17 BST; 4 days ago
TriggeredBy: ● proc-sys-fs-binfmt_misc.automount
Where: /proc/sys/fs/binfmt_misc
What: binfmt_misc
Docs:
https://www.kernel.org/doc/html/latest/admin-guide/binfmt-misc.html
https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
Tasks: 0 (limit: 154244)
Memory: 188.0K
CPU: 12ms
CGroup: /system.slice/proc-sys-fs-binfmt_misc.mount
Probably .. because as you see there are two units for binfmt_misc.
One is just a static/regular .mount unit and the second one which is using
autofs.
IMO using automounter to mount sysfs, procfs and binfmt_misc is really
OVERKILL.
If the regular unit works flawlessly it looks like systemd could be
compiled without autofs.
For example mqueue is mounted over .mount unit
$ cat /usr/lib/systemd/system/dev-mqueue.mount | grep -v \#
[Unit]
Description=POSIX Message Queue File System
Documentation=man:mq_overview(7)
Documentation=
https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
DefaultDependencies=no
Before=sysinit.target
ConditionPathExists=/proc/sys/fs/mqueue
ConditionCapability=CAP_SYS_ADMIN
[Mount]
What=mqueue
Where=/dev/mqueue
Type=mqueue
Options=nosuid,nodev,noexec
Looks like all other pseudo filesystems are mounted over .mount units with
probably one exception .. binfmt_misc.
Probably .. because as I've pointed there are two units for that fs.
$ rpm -ql systemd | grep \\.mount$
/usr/lib/systemd/system/dev-hugepages.mount
/usr/lib/systemd/system/dev-mqueue.mount
/usr/lib/systemd/system/local-fs.target.wants/tmp.mount
/usr/lib/systemd/system/proc-sys-fs-binfmt_misc.mount
/usr/lib/systemd/system/sys-fs-fuse-connections.mount
/usr/lib/systemd/system/sys-kernel-config.mount
/usr/lib/systemd/system/sys-kernel-debug.mount
/usr/lib/systemd/system/sys-kernel-tracing.mount
/usr/lib/systemd/system/sysinit.target.wants/dev-hugepages.mount
/usr/lib/systemd/system/sysinit.target.wants/dev-mqueue.mount
/usr/lib/systemd/system/sysinit.target.wants/sys-fs-fuse-connections.mount
/usr/lib/systemd/system/sysinit.target.wants/sys-kernel-config.mount
/usr/lib/systemd/system/sysinit.target.wants/sys-kernel-debug.mount
/usr/lib/systemd/system/sysinit.target.wants/sys-kernel-tracing.mount
/usr/lib/systemd/system/tmp.mount
kloczek
--
Tomasz Kłoczko | LinkedIn: http://lnkd.in/FXPWxH
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