How to trigger expand on root partition?

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No. Since the read-only sysroot was disabled recently, the version I was using did not have read-only sysroot.

I don’t think we have any specific plans, but you can use a separate mount namespace to get around your current problem.

[core@localhost ~]$ cat /proc/mounts | grep sysroot
/dev/sdb4 /sysroot xfs ro,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,prjquota 0 0
[core@localhost ~]$ sudo su -
[root@localhost ~]# unshare --mount
[root@localhost ~]# cat /proc/mounts | grep sysroot
/dev/sdb4 /sysroot xfs ro,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,prjquota 0 0
[root@localhost ~]# mount -o remount,rw /sysroot 
[root@localhost ~]# cat /proc/mounts | grep sysroot
/dev/sdb4 /sysroot xfs rw,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,prjquota 0 0
[root@localhost ~]# xfs_growfs /sysroot
meta-data=/dev/sdb4              isize=512    agcount=74, agsize=141760 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=0
         =                       reflink=1
data     =                       bsize=4096   blocks=10354427, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1
log      =internal log           bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 10354427 to 12975867
[root@localhost ~]# exit
logout
[root@localhost ~]# cat /proc/mounts | grep sysroot
/dev/sdb4 /sysroot xfs ro,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,prjquota 0 0
[root@localhost ~]# exit
logout
[core@localhost ~]$ cat /proc/mounts | grep sysroot
/dev/sdb4 /sysroot xfs ro,seclabel,relatime,attr2,inode64,logbufs=8,logbsize=32k,prjquota 0 0

If you’re running the growfs from a systemd unit you should be able to use MountFlags=slave and the growfs should work I think.

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