** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/2107516
Title:
Ubuntu 22.04 kernel 5.15.0.136 changes /proc/mounts for btfs volumes
Status in linux package in Ubuntu:
New
Status in linux source package in Jammy:
New
Bug description:
We mount btrfs volumes, and we are seeing a change in behavior from
the 5.15.0-126 kernel to 5.15.0.136
In the old behavior (existing for as long as we have had the product),
mounting a btrfs lvm results in:
$: grep /DataStore0 /proc/mounts
/dev/mapper/VG0-LV0 /DataStore0 btrfs
rw,seclabel,relatime,space_cache=v2,subvolid=5,subvol=/ 0 0
however same mount with the new kernel results in a different output:
$: grep /DataStore0 /proc/mounts
/dev/VG0/LV0 /DataStore0 btrfs
rw,seclabel,relatime,space_cache=v2,subvolid=5,subvol=/ 0 0
(notice the /dev/VG0/LV0 vs. /dev/mapper/VG0-LV0) for the same mount.
Our application code uses /dev/mapper checking extensively and we
would like to avoid a rewrite if possible.
Online searches bring me to this bug: https://bugs.gentoo.org/947126
which seems very similar
We have this change as part of the new kernel:
$:git log --oneline --grep "btrfs: avoid unnecessary device path update for
the same device" Ubuntu-5.15.0-126.136..Ubuntu-5.15.0-136.147
fc83c00ca63b btrfs: avoid unnecessary device path update for the same device
https://lore.kernel.org/linux-
btrfs/30aefd8b4e8c1f0c5051630b106a1ff3570d28ed.1735537399.git....@suse.com/T/#u
seems like a fix , I don't see this accepted yet though.
If we could either revert this change or provide guidance how we
should be reading this file that would be great. Thank you.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2107516/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
