Genkernel - LVM issue

[madurani]

Hello All, When i wonted to extend /usr lvm volume so i found out that is incorrect mounted. Volume is lvm, but mounted is as dm-8. Same is for root /:

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pc-marek1 /etc # df -h | grep dm-5
/dev/dm-5                     15G   41M   14G   1% /

pc-marek1 /etc # df -h | grep usr
/dev/dm-8                     20G   15G  3.6G  81% /usr
/dev/mapper/system-portage    15G  1.9G   13G  14% /usr/portage
/dev/mapper/system-src        20G   13G  5.8G  69% /usr/src

I tried investigate issue and in dmesg i found that during booting is some problem with lvm, probably some commands missing(failed to execute >>> No such file or directory):

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pc-marek1 /etc # dmesg | grep -i lvm
[    0.000000] Command line: BOOT_IMAGE=/vmlinuz-6.12.1-gentoo-x86_64 root=/dev/mapper/system-root ro dolvm domdadm rootfstype=ext4 pv6.disable=1 mitigations=auto rd.driver.blacklist=nouveau nouveau.modeset=0 nvidia_drm.modeset=1 video=vesafb:off,efifb:on rd.lvm.vg=system
[    0.279490] Kernel command line: BOOT_IMAGE=/vmlinuz-6.12.1-gentoo-x86_64 root=/dev/mapper/system-root ro dolvm domdadm rootfstype=ext4 pv6.disable=1 mitigations=auto rd.driver.blacklist=nouveau nouveau.modeset=0 nvidia_drm.modeset=1 video=vesafb:off,efifb:on rd.lvm.vg=system
[    0.279698] Unknown kernel command line parameters "dolvm domdadm BOOT_IMAGE=/vmlinuz-6.12.1-gentoo-x86_64", will be passed to user space.
[    2.649439]     dolvm
[    3.979142] udevd[2401]: failed to execute '/usr/bin/systemd-run' '/usr/bin/systemd-run --no-block --property DefaultDependencies=no --unit lvm-activate-system /usr/sbin/lvm vgchange -aay --autoactivation event system': No such file or directory
[    4.002315] udevd[2402]: failed to execute '/usr/bin/systemd-run' '/usr/bin/systemd-run --no-block --property DefaultDependencies=no --unit lvm-activate-data02 /usr/sbin/lvm vgchange -aay --autoactivation event data02': No such file or directory
[    4.002376] udevd[2403]: failed to execute '/usr/bin/systemd-run' '/usr/bin/systemd-run --no-block --property DefaultDependencies=no --unit lvm-activate-kvm-storage /usr/sbin/lvm vgchange -aay --autoactivation event kvm-storage': No such file or directory
[    4.002417] udevd[2404]: failed to execute '/usr/bin/systemd-run' '/usr/bin/systemd-run --no-block --property DefaultDependencies=no --unit lvm-activate-data01 /usr/sbin/lvm vgchange -aay --autoactivation event data01': No such file or directory
[    6.697823] systemd[1]: Listening on LVM2 poll daemon socket.
[    6.733309] systemd[1]: Starting Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling...

It look like that in vmlinuz-6.12.1-gentoo-x86_64 missing some lvm commnads. After mounting root and usr as dm-X devices are rest of lvm volumes mounted correctly.
kernel I commpile via genkernel:

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pc-marek1 /etc # genkernel --oldconfig --lvm --mdadm all

In /etc/default/grub i have line:

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GRUB_CMDLINE_LINUX="dolvm domdadm rootfstype=ext4 pv6.disable=1 mitigations=auto rd.driver.blacklist=nouveau nouveau.modeset=0 nvidia_drm.modeset=1 video=vesafb:off,efifb:on rd.lvm.vg=system"

I checked "how to" of grub, lvm and genkernel but i didn't find nothing useful. Please help me.

[madurani]

I tried extract initramfs-6.12.1-gentoo-x86_64.img and there missing commnad/file systemd-run

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pc-marek1 ~/test # file /boot/initramfs-6.12.1-gentoo-x86_64.img
/boot/initramfs-6.12.1-gentoo-x86_64.img: XZ compressed data, checksum NONE

pc-marek1 ~/test # xzcat /boot/initramfs-6.12.1-gentoo-x86_64.img | cpio -idm

pc-marek1 ~/test # find . | grep systemd-run
pc-marek1 ~/test # 

[sam_]

See bug 944499.

[madurani]

Yes i saw it and past there my issues, but bug is for "systems without systemd" and i use systemd...

[madurani]

command:

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dracut --force --add systemd --add lvm /boot/initramfs-$(uname -r).img $(uname -r)

fixed all my trouble with udev and mainly with mount of root and usr:

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pc-marek1 ~ # df -h
Filesystem                   Size  Used Avail Use% Mounted on
/dev/mapper/system-root       15G  156M   14G   2% /
/dev/mapper/system-usr        21G   15G  4.6G  77% /usr

all messages udev messages "No such file or directory" disappeared

[sublogic]

Hello All, When i wonted to extend /usr lvm volume so i found out that is incorrect mounted. Volume is lvm, but mounted is as dm-8.

I think your dm-8 mount is normal. For example on my computer:

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$ mount -l -t ext4
/dev/mapper/vg0-root on / type ext4 (rw,relatime)
/dev/mapper/vg0-var on /var type ext4 (rw,relatime)
/dev/mapper/vg0-home on /home type ext4 (rw,relatime)

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$ file /dev/mapper/vg0-{root,var,home}
/dev/mapper/vg0-root: symbolic link to ../dm-1
/dev/mapper/vg0-var:  symbolic link to ../dm-2
/dev/mapper/vg0-home: symbolic link to ../dm-3

The systemd errors are another matter.

[madurani]

Mount point with dm isn't problem. Problem is when you need extend this lvm volume, then you got error message

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pc-marek1 /usr/portage/sys-kernel/genkernel # lvresize -r -L +1G /dev/mapper/system-root 
  LV /dev/mapper/system-root mounted at / may have been renamed (from /dev/dm-5).
  File system resizing not supported: fs utilities do not support renamed devices.

dracut fixed it, now are volumes mounted correctly and lvextend and lvresize work .

[sublogic]

Strange, but did you try this ?

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# lvresize -r -L +1G /dev/dm-5

Oops, I see that it got fixed. Never mind.