~ # mount
rootfs on / type rootfs (rw,size=1818816k,nr_inodes=454704)
devtmpfs on /dev type devtmpfs (rw,relatime,size=1818816k,nr_inodes=454704,mode=755)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
sysfs on /sys type sysfs (rw,relatime)
proc on /proc type proc (rw,relatime)
/dev/block/sda9 on /data type f2fs (rw,relatime,background_gc=on,user_xattr,acl,inline_data,active_logs=6)
/dev/block/loop0 on /target type ext2 (ro,relatime,errors=continue)
~ # umount target
~ # losetup -d /dev/block/loop0
~ # losetup -a
~ # los
~ # mount -o rw /data/rootfs.img /target
~ # mount
rootfs on / type rootfs (rw,size=1818816k,nr_inodes=454704)
devtmpfs on /dev type devtmpfs (rw,relatime,size=1818816k,nr_inodes=454704,mode=755)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
sysfs on /sys type sysfs (rw,relatime)
proc on /proc type proc (rw,relatime)
/dev/block/sda9 on /data type f2fs (rw,relatime,background_gc=on,user_xattr,acl,inline_data,active_logs=6)
/dev/block/loop0 on /target type ext2 (ro,relatime,errors=continue)
~ #