Shrink /home/ on Sailfish OS
Table of Contents
For some reason, Sailfish OS on a Gemini PDA
has a very small /
but an overly large /home/.
This post describes how to reclaim space from /home/.
NOTE: at the end of this post you will fine the same procedure in short form as run on my SONY Xperia X F5121 that’s also running SFOS.
Shrink overly large /home on Gemini
Thanks to the power of LVM, this is a no brainer, just need to stop the user session.
To be able to stop said user session, ssh in directly as root. You’ll have to drop in your ssh pubkey. If you do not know how to do that, then you should not attempt this dangerous procedure.
user@workstation ~ $ ssh root@gemini
[root@Sailfish ~]# systemctl stop user@100000.service
[root@Sailfish ~]# lvresize -L 32G --resizefs --autobackup y sailfish/home
/dev/mmcblk0rpmb: read failed after 0 of 4096 at 0: Input/output error
Do you want to unmount "/home" ? [Y|n] y
fsck from util-linux 2.31
home: 795/3528000 files (2.3% non-contiguous), 243792/14438400 blocks
resize2fs 1.43.1 (08-Jun-2016)
Resizing the filesystem on /dev/mapper/sailfish-home to 8388608 (4k) blocks.
The filesystem on /dev/mapper/sailfish-home is now 8388608 (4k) blocks long.
Size of logical volume sailfish/home changed from <55.08 GiB (14100 extents) to 32.00 GiB (8192 extents).
Logical volume sailfish/home successfully resized.
This gives you some 23 GiB to allocate later.
[root@Sailfish ~]# vgs
/dev/mmcblk0rpmb: read failed after 0 of 4096 at 0: Input/output error
VG #PV #LV #SN Attr VSize VFree
sailfish 1 2 0 wz--n- <57.52g <23.08g
Since you killed the user session, either restart it or just reboot the phone. Since I wanted to verify that it comes up cleanly after the change, I just rebooted.
[root@Sailfish ~]# systemctl reboot
Grow Any Mounted Filesystem
Since your volume group (VG) now has free physical extends (PE), you can grow any logical volume (LV) and it’s filesystem at runtime with
[root@Sailfish ~]# lvextend -L +…G --resizefs <VG>/<LV>
Example
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. Ideally, Jolla would blacklist 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
[...]
[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% /
on the SONY Xperia X F5121
user@workstation ~ $ ssh root@sailfishx
[...]
[root@Sailfish ~]# df -h -x tmpfs -x devtmpfs
Filesystem Size Used Avail Use% Mounted on
rootfs 2.4G 1.5G 891M 63% /
/dev/sailfish/root 2.4G 1.5G 891M 63% /
/dev/sailfish/home 18G 695M 18G 4% /home
/dev/mmcblk0p13 12M 3.7M 7.8M 32% /dsp
/dev/mmcblk0p28 376M 165M 204M 45% /odm
/dev/mmcblk0p25 28M 244K 27M 1% /persist
/dev/mmcblk0p52 596M 590M 0 100% /fimage
/dev/mmcblk0p3 84M 62M 23M 74% /firmware
/dev/sailfish/home 18G 695M 18G 4% /opt/alien/data
/dev/sailfish/root 2.4G 1.5G 891M 63% /opt/alien/bin
/dev/sailfish/root 2.4G 1.5G 891M 63% /opt/alien/sbin
/dev/sailfish/root 2.4G 1.5G 891M 63% /opt/alien/lib
/dev/sailfish/root 2.4G 1.5G 891M 63% /opt/alien/usr
/dev/sailfish/root 2.4G 1.5G 891M 63% /opt/alien/var
/dev/sailfish/root 2.4G 1.5G 891M 63% /opt/alien/etc
/dev/sailfish/home 18G 695M 18G 4% /opt/alien/home
/dev/sailfish/root 2.4G 1.5G 891M 63% /opt/alien/media
/dev/sailfish/root 2.4G 1.5G 891M 63% /opt/alien/vendor
/dev/mmcblk0p28 376M 165M 204M 45% /opt/alien/odm
/dev/sailfish/root 2.4G 1.5G 891M 63% /opt/alien/system_jolla
/dev/sailfish/root 2.4G 1.5G 891M 63% /opt/alien/data_jolla
/dev/fuse 18G 695M 18G 4% /opt/alien/storage/sdcard0
[root@Sailfish ~]# systemctl stop user@100000.service
[root@Sailfish ~]# pvs
/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
PV VG Fmt Attr PSize PFree
/dev/mmcblk0p51 sailfish lvm2 a-- <20.70g 0
[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---- 18.25g
root sailfish -wi-ao---- 2.44g
[root@Sailfish ~]# df -h /home/
Filesystem Size Used Avail Use% Mounted on
/dev/sailfish/home 18G 695M 18G 4% /home
[root@Sailfish ~]# umount /opt/alien/data
[root@Sailfish ~]# umount /opt/alien/home
[root@Sailfish ~]# umount /home
[root@Sailfish ~]# df -h|grep home
[root@Sailfish ~]# lvresize -L 6G --resizefs --autobackup y sailfish/home
/dev/mmcblk0rpmb: read failed after 0 of 4096 at 0: Input/output error
fsck from util-linux 2.31
home: clean, 11383/1077216 files, 249653/4785152 blocks
resize2fs 1.43.1 (08-Jun-2016)
Resizing the filesystem on /dev/mapper/sailfish-home to 1572864 (4k) blocks.
The filesystem on /dev/mapper/sailfish-home is now 1572864 (4k) blocks long.
Size of logical volume sailfish/home changed from 18.25 GiB (4673 extents) to 6.00 GiB (1536 extents).
Logical volume sailfish/home successfully resized.
[root@Sailfish ~]# vgs
/dev/mmcblk0rpmb: read failed after 0 of 4096 at 0: Input/output error
VG #PV #LV #SN Attr VSize VFree
sailfish 1 2 0 wz--n- <20.70g 12.25g
[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 ~]# systemctl reboot
pcfe@karhu ~ $ ssh root@sailfishx
[...]
[root@Sailfish ~]# df -h -x tmpfs -x devtmpfs
Filesystem Size Used Avail Use% Mounted on
rootfs 3.4G 1.5G 1.9G 45% /
/dev/sailfish/root 3.4G 1.5G 1.9G 45% /
/dev/sailfish/home 6.0G 696M 5.2G 12% /home
/dev/mmcblk0p3 84M 62M 23M 74% /firmware
/dev/mmcblk0p28 376M 165M 204M 45% /odm
/dev/mmcblk0p13 12M 3.7M 7.8M 32% /dsp
/dev/mmcblk0p25 28M 244K 27M 1% /persist
/dev/mmcblk0p52 596M 590M 0 100% /fimage
/dev/sailfish/home 6.0G 696M 5.2G 12% /opt/alien/data
/dev/sailfish/root 3.4G 1.5G 1.9G 45% /opt/alien/bin
/dev/sailfish/root 3.4G 1.5G 1.9G 45% /opt/alien/sbin
/dev/sailfish/root 3.4G 1.5G 1.9G 45% /opt/alien/lib
/dev/sailfish/root 3.4G 1.5G 1.9G 45% /opt/alien/usr
/dev/sailfish/root 3.4G 1.5G 1.9G 45% /opt/alien/var
/dev/sailfish/root 3.4G 1.5G 1.9G 45% /opt/alien/etc
/dev/sailfish/home 6.0G 696M 5.2G 12% /opt/alien/home
/dev/sailfish/root 3.4G 1.5G 1.9G 45% /opt/alien/media
/dev/sailfish/root 3.4G 1.5G 1.9G 45% /opt/alien/vendor
/dev/mmcblk0p28 376M 165M 204M 45% /opt/alien/odm
/dev/sailfish/root 3.4G 1.5G 1.9G 45% /opt/alien/system_jolla
/dev/sailfish/root 3.4G 1.5G 1.9G 45% /opt/alien/data_jolla
/dev/fuse 6.0G 696M 5.2G 12% /opt/alien/storage/sdcard0
[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- <20.70g 11.25g