If after uninstalling block4 and block5, I don't want overlay to have direct access to block4 or block5, what should I do?
thanks， Byron At 2020-03-02 16:21:17, "www" <ouyangxua...@163.com> wrote: 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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