the options are taken from the kernel, so its probably a btrfs kernel issue
** Package changed: util-linux (Ubuntu) => linux (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to util-linux in Ubuntu. https://bugs.launchpad.net/bugs/2049304 Title: mount shows incorrect compress option for BTRFS subvolumes Status in linux package in Ubuntu: New Bug description: I have a number of subvolumes on a single BTRFS partition, the only partition on the disk, but the compression options passed for the subvolumes differ. The correct compression is used when files are created, so that's all working fine, the only issue is that issuing a `mount` command (with no options) shows the wrong option. In this particular case it shows that all subvolumes are using compress=zlib:3, when in reality some are using zstd. My (trimmed) fstab: UUID=83ed7b7f-ef51-49d7-a6be-a8efee1cdd32 / btrfs defaults,subvol=@ 0 0 UUID=83ed7b7f-ef51-49d7-a6be-a8efee1cdd32 /home btrfs defaults,subvol=@home 0 0 UUID=36aa8383-a103-44c3-93ea-826f1fda1c14 /var/log btrfs defaults,compress=zstd,autodefrag,subvol=log 0 0 # User stuff UUID=36aa8383-a103-44c3-93ea-826f1fda1c14 /home/ken/Downloads btrfs defaults,compress=zstd,autodefrag,subvol=Downloads 0 0 UUID=36aa8383-a103-44c3-93ea-826f1fda1c14 /home/ken/.config/google-chrome btrfs defaults,compress,autodefrag,subvol=google-chrome 0 0 UUID=36aa8383-a103-44c3-93ea-826f1fda1c14 /home/ken/.thunderbird btrfs defaults,compress,autodefrag,subvol=thunderbird 0 0 UUID=36aa8383-a103-44c3-93ea-826f1fda1c14 /home/ken/.cache btrfs defaults,compress,autodefrag,subvol=cache 0 0 What mount shows: $ mount | fgrep /dev/sd /dev/sdc on / type btrfs (rw,relatime,ssd,discard=async,space_cache=v2,subvolid=256,subvol=/@) /dev/sdc on /home type btrfs (rw,relatime,ssd,discard=async,space_cache=v2,subvolid=257,subvol=/@home) /dev/sdb4 on /boot type ext4 (rw,relatime,discard) /dev/sda on /home/ken/.cache type btrfs (rw,relatime,compress=zlib:3,space_cache=v2,autodefrag,subvolid=262,subvol=/cache) /dev/sda on /home/ken/.config/google-chrome type btrfs (rw,relatime,compress=zlib:3,space_cache=v2,autodefrag,subvolid=260,subvol=/google-chrome) /dev/sda on /home/ken/.thunderbird type btrfs (rw,relatime,compress=zlib:3,space_cache=v2,autodefrag,subvolid=261,subvol=/thunderbird) /dev/sda on /home/ken/Downloads type btrfs (rw,relatime,compress=zlib:3,space_cache=v2,autodefrag,subvolid=257,subvol=/Downloads) /dev/sda on /var/log type btrfs (rw,relatime,compress=zlib:3,space_cache=v2,autodefrag,subvolid=256,subvol=/log) /dev/sda on /home/ken/.config/transmission type btrfs (rw,relatime,compress=zlib:3,space_cache=v2,autodefrag,subvolid=263,subvol=/transmission) /dev/sda on /home/test/.xsession-errors type btrfs (rw,relatime,compress=zlib:3,space_cache=v2,autodefrag,subvolid=256,subvol=/log) /dev/sda on /home/ken/.xsession-errors type btrfs (rw,relatime,compress=zlib:3,space_cache=v2,autodefrag,subvolid=256,subvol=/log) /dev/sda on /home/ken/.xsession-errors.old type btrfs (rw,relatime,compress=zlib:3,space_cache=v2,autodefrag,subvolid=256,subvol=/log) /dev/sda on /home/test/.xsession-errors.old type btrfs (rw,relatime,compress=zlib:3,space_cache=v2,autodefrag,subvolid=256,subvol=/log) And to confirm that the correct compression is being used: $ sudo compsize /var/log/syslog Processed 1 file, 30 regular extents (30 refs), 0 inline. Type Perc Disk Usage Uncompressed Referenced TOTAL 27% 188K 684K 596K none 100% 28K 28K 28K zstd 24% 160K 656K 568K $ sudo compsize ~/Downloads/test Processed 1 file, 0 regular extents (0 refs), 1 inline. Type Perc Disk Usage Uncompressed Referenced TOTAL 42% 458B 1.0K 1.0K zlib 42% 458B 1.0K 1.0K I don't know if mount is to blame here, it could be something lacking in the kernel/BTRFS. $ uname -a Linux ken 6.5.0-14-generic #14~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Nov 20 18:15:30 UTC 2 x86_64 x86_64 x86_64 GNU/Linux ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: mount 2.37.2-4ubuntu3 ProcVersionSignature: Ubuntu 6.5.0-14.14~22.04.1-generic 6.5.3 Uname: Linux 6.5.0-14-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu82.5 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: MATE Date: Sun Jan 14 11:16:52 2024 SourcePackage: util-linux UpgradeStatus: No upgrade log present (probably fresh install) modified.conffile..etc.apport.crashdb.conf: [modified] mtime.conffile..etc.apport.crashdb.conf: 2019-08-06T11:56:22.315382 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2049304/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
