[SailfishX] [Gemini] The rootfs is too small

answered 2019-03-03 16:22:15 +0300

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updated 2019-03-03 16:31:00 +0300

pcfe
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http://www.pcfe.net/

While I also found the extremely small / annoying, thanks to LVM this is a 2 minute thing to fix.

NOTE; never shrink any filesystem if you do not have a known restorable backup!

1. enable dev mode
2. enable remote login, noting the password for nemo
3. devel-su
4. drop your ssh pubkey in /root/.ssh/authorized_keys
5. ssh in directly as root (we will be killing the user session in a moment)
6. stop the user session [root@Sailfish ~]# systemctl stop user@100000.service
7. shrink your /home to 32GiB with [root@Sailfish ~]# lvresize -L 32G --resizefs --autobackup y sailfish/home (this step will include unmounting /home, for that to be possible we had to stop the user session.)
8. cleanly reboot your Sailfish X device with [root@Sailfish ~]# systemctl reboot

Do note, at this point your additional free space is not allocated anywhere. I personally like it this way because then I can grow any LV on the fly, without any interruption while the system is running. Only the shrink requires unmounting the ext4 filesystem. Growing happens on-line.

Here's an example of on-line growing / by 1 GiB: (you can ignore the read errors as long as they are not on /dev/mmcblk0p29. Jolla; you may consider blacklisting mmcblk0rpmb)

[root@Sailfish ~]# vgs
  /dev/mmcblk0rpmb: read failed after 0 of 4096 at 0: Input/output error
  /dev/mmcblk0rpmb: read failed after 0 of 4096 at 4128768: Input/output error
  /dev/mmcblk0rpmb: read failed after 0 of 4096 at 4186112: Input/output error
  /dev/mmcblk0rpmb: read failed after 0 of 4096 at 4096: Input/output error
  VG       #PV #LV #SN Attr   VSize   VFree  
  sailfish   1   2   0 wz--n- <57.52g <23.08g
[root@Sailfish ~]# lvs
  /dev/mmcblk0rpmb: read failed after 0 of 4096 at 0: Input/output error
  LV   VG       Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  home sailfish -wi-ao---- 32.00g                                                    
  root sailfish -wi-ao----  2.44g                                                    
[root@Sailfish ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
rootfs                2.4G  1.3G  1.1G  56% /
/dev/sailfish/root    2.4G  1.3G  1.1G  56% /
/dev/sailfish/home     32G   57M   32G   1% /home
devtmpfs              1.9G  496K  1.9G   1% /dev
tmpfs                 1.9G  112K  1.9G   1% /dev/shm
tmpfs                 1.9G   16M  1.9G   1% /run
tmpfs                 1.9G     0  1.9G   0% /sys/fs/cgroup
tmpfs                 1.9G  8.0K  1.9G   1% /tmp
tmpfs                 1.9G     0  1.9G   0% /mnt
tmpfs                 1.9G     0  1.9G   0% /storage
/dev/mmcblk0p8        3.9M   68K  3.7M   2% /protect_f
/dev/mmcblk0p9        8.3M   60K  8.0M   1% /protect_s
/dev/block/platform/mtk-msdc.0/by-name/nvdata
                       28M  7.7M   20M  29% /nvdata
/dev/block/platform/mtk-msdc.0/by-name/nvcfg
                      3.9M   44K  3.7M   2% /nvcfg
tmpfs                 383M  576K  382M   1% /run/user/100000
tmpfs                 383M     0  383M   0% /run/user/0
[root@Sailfish ~]# lvextend -L +1G --resizefs sailfish/root
  /dev/mmcblk0rpmb: read failed after 0 of 4096 at 0: Input/output error
  Size of logical volume sailfish/root changed from 2.44 GiB (625 extents) to 3.44 GiB (881 extents).
  Logical volume sailfish/root successfully resized.
resize2fs 1.43.1 (08-Jun-2016)
Filesystem at /dev/mapper/sailfish-root is mounted on /; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 1
The filesystem on /dev/mapper/sailfish-root is now 902144 (4k) blocks long.

[root@Sailfish ~]# df -h /
Filesystem            Size  Used Avail Use% Mounted on
/dev/sailfish/root    3.4G  1.3G  2.1G  39% /