[systemd-devel] Ask some questions about overlay+/dev/mtdblock?

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Dear all,


Systemd is used in the embedded system. and some mounting information is as follows:


dev on /dev type devtmpfs (rw,relatime,size=221372k,nr_inodes=55343,mode=755)
sys on /sys type sysfs (rw,relatime)
proc on /proc type proc (rw,relatime)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
/dev/mtdblock4 on /run/initramfs/ro type squashfs (ro,relatime)
/dev/mtdblock5 on /run/initramfs/rw type jffs2 (rw,relatime)
cow on / type overlay (rw,relatime,lowerdir=run/initramfs/ro,upperdir=run/initramfs/rw/cow,workdir=run/initramfs/rw/work)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)


I have a question, why can overlayfs directly save the information in block4 and block5 (such as the running information of SYSTEMd) after I uninstall block4 and block5 with umount command？
Who knows why, or gives some advice?


thanks,
Byron

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