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Magic SysRQ key



Hi,
 I mount my home directory manually every-time  ...
 And then do a startx

But when I try to use Sysrq+u I do get a message 

sysrq: Emergency Remount R/O
Emergency Remount complete

But my home directory is still writable. I already have a read-only rootfs.
Since I do mount my home directory manually (btrfs), I dont add the entry in fstab. Is entry in fstab really necessary?  Or does the kernel take into consideration all the file systems currently mounted ?
I have a few other ext4 file systems which too dont get remounted as RO.

Can someone explain me how to get the SysRq+u to remount all my FS into RO mode please ?
thanks

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