Read only file system

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1

My problem.
In my dad’s notebook i have TW installed, some days ago ,after an update, Plasma stop working (just Plasma) and one suggestion was to

mv .config .config-old

. After that solution Plasma work again and i configured the desktop normally. Some days later i got this “Read only file system” after trying to run anything that have config files inside that .config directory.

At the beginning this happens after some time of use, hours. Now happens after the boot.

NOTE: i check the permissions and are all fine. And if i try to change the permissions the “Read only file system” appear.

Thanks in advance for any help (sorry for the bad english)

2

Hi, welcome !!!

Please show output of


mount
3

Hi, thanks for the help.

mount output:


sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
devtmpfs on /dev type devtmpfs (rw,nosuid,size=1449024k,nr_inodes=362256,mode=755)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup2 on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
bpf on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime,mode=700)
cgroup on /sys/fs/cgroup/perf_event type cgroup (rw,nosuid,nodev,noexec,relatime,perf_event)
cgroup on /sys/fs/cgroup/pids type cgroup (rw,nosuid,nodev,noexec,relatime,pids)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/hugetlb type cgroup (rw,nosuid,nodev,noexec,relatime,hugetlb)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
cgroup on /sys/fs/cgroup/rdma type cgroup (rw,nosuid,nodev,noexec,relatime,rdma)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
/dev/sda2 on / type btrfs (rw,relatime,space_cache,subvolid=267,subvol=/@/.snapshots/1/snapshot)
systemd-1 on /proc/sys/fs/binfmt_misc type autofs (rw,relatime,fd=27,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=16307)
debugfs on /sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime)
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime,pagesize=2M)
mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime)
/dev/sda2 on /root type btrfs (rw,relatime,space_cache,subvolid=262,subvol=/@/root)
/dev/sda3 on /home type btrfs (ro,relatime,space_cache,subvolid=5,subvol=/)
/dev/sda2 on /.snapshots type btrfs (rw,relatime,space_cache,subvolid=266,subvol=/@/.snapshots)
/dev/sda2 on /boot/grub2/x86_64-efi type btrfs (rw,relatime,space_cache,subvolid=264,subvol=/@/boot/grub2/x86_64-efi)
/dev/sda2 on /opt type btrfs (rw,relatime,space_cache,subvolid=263,subvol=/@/opt)
/dev/sda2 on /usr/local type btrfs (rw,relatime,space_cache,subvolid=259,subvol=/@/usr/local)
/dev/sda2 on /srv type btrfs (rw,relatime,space_cache,subvolid=261,subvol=/@/srv)
/dev/sda2 on /boot/grub2/i386-pc type btrfs (rw,relatime,space_cache,subvolid=265,subvol=/@/boot/grub2/i386-pc)
/dev/sda2 on /var type btrfs (rw,relatime,space_cache,subvolid=258,subvol=/@/var)
/dev/sda2 on /tmp type btrfs (rw,relatime,space_cache,subvolid=260,subvol=/@/tmp)
tmpfs on /run/user/1000 type tmpfs (rw,nosuid,nodev,relatime,size=291888k,mode=700,uid=1000,gid=100)
gvfsd-fuse on /run/user/1000/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,relatime,user_id=1000,group_id=100)
fusectl on /sys/fs/fuse/connections type fusectl (rw,nosuid,nodev,noexec,relatime)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=291888k,mode=700)

This is an example of the message when i try to open something:

4

As you can see in the output, /dev/sda3 is mounted on /home, but read only ( ro ). Please also show


cat /etc/fstab
5

Hey, yeah, i see the (ro). I have 0 idea of what i have to do now so i’m in your hands my friend. Than you very much for the help.


jano@jano-nb:~> cat /etc/fstab 
UUID=f504d865-ec95-4b91-a4e2-529f2cdc1f24  /                       btrfs  defaults                      0  0
UUID=f504d865-ec95-4b91-a4e2-529f2cdc1f24  /boot/grub2/x86_64-efi  btrfs  subvol=/@/boot/grub2/x86_64-efi  0  0
UUID=f504d865-ec95-4b91-a4e2-529f2cdc1f24  /boot/grub2/i386-pc     btrfs  subvol=/@/boot/grub2/i386-pc  0  0
UUID=f504d865-ec95-4b91-a4e2-529f2cdc1f24  /.snapshots             btrfs  subvol=/@/.snapshots          0  0
UUID=f504d865-ec95-4b91-a4e2-529f2cdc1f24  /var                    btrfs  subvol=/@/var                 0  0
UUID=f504d865-ec95-4b91-a4e2-529f2cdc1f24  /usr/local              btrfs  subvol=/@/usr/local           0  0
UUID=f504d865-ec95-4b91-a4e2-529f2cdc1f24  /tmp                    btrfs  subvol=/@/tmp                 0  0
UUID=f504d865-ec95-4b91-a4e2-529f2cdc1f24  /srv                    btrfs  subvol=/@/srv                 0  0
UUID=f504d865-ec95-4b91-a4e2-529f2cdc1f24  /root                   btrfs  subvol=/@/root                0  0
UUID=f504d865-ec95-4b91-a4e2-529f2cdc1f24  /opt                    btrfs  subvol=/@/opt                 0  0
UUID=c2d941c2-bd1c-4dac-bb94-0ecc823a4def  /home                   btrfs  defaults                      0  0
/dev/sda4                                  swap                    swap   defaults                      0  0
6

Hmmmm, never seen a setup like this, with btrfs for /home on a separate partition. I’d backup /home, change that to ext4 or xfs, then restore the data.

7

mmmmm, i’m thinking on buying 1 ssd for this notebook, maybe is a good time to do that and reinstall :slight_smile:

Thanks !

8

When a file system is mounted read-only where that is not specified, it is often the result of problems during mounting. There must be something in the logs then.

9

More than likely /home is actually on its own BTRFS subvolume.

The following command displays volumes and subvolumes, since the path is not defined, this should display the whole tree

btrfs subvolume list

Background:
Until LEAP 15.0, the default installation sets up only the root partition as BTRFS, and then deploys /home in a separate XFS partition.
Starting with LEAP 15.1, the entire disk is one partition, and /root and /home are configured as BTRFS sub-volumes in the same volume.

At least,
That’s what the above command should display.

TSU

10

Then why isn’t it it registered as such in his fstab as the other subvolumes are?

11

Indeed. My answer? Because it is NOT a subvolume. The fstab clearly shows 2 btrfs filesystems, one for / incl. subvolumes, one for what’s mounted on /home.

12

Well, I did not aks you, I am fully aware that you saw it correct.

13

Just saying…
No questions were asked about file systems used and disk layout, I see you’re inferring from the “mount” command.
Am simply suggesting what should be seen if the system was installed if all defaults were accepted.
The User should be aware of any personal changes which might have been made, or the likelihood something different might have been installed (typically requiring some level of technical sophistication).

So, for instance if BTRFS is installed, I would suggest

btrfs fi df /

TSU

14

And from his /etc/fstab.

We try to find out what the real situation is and not what it could have been if he installed in another way then he did.

15

And how is that going to deal with a ro fs on /dev/sda3 where / is on /dev/sda2 ? Commands like ‘mount’ and ‘cat /etc/fstab’ report the truth and nothing but that.