android 下面的系统文件复制问题

Question

1|angler:/ # ls -al /dev/block/platform/soc.0/f9824900.sdhci/by-name/
ls -al /dev/block/platform/soc.0/f9824900.sdhci/by-name/
total 0
drwxr-xr-x 2 root root  920 1970-01-01 21:51 .
drwxr-xr-x 4 root root 1000 1970-01-01 21:51 ..
lrwxrwxrwx 1 root root   20 1970-01-01 21:51 DDR -> /dev/block/mmcblk0p8
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 aboot -> /dev/block/mmcblk0p10
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 abootbak -> /dev/block/mmcblk0p16
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 apdp -> /dev/block/mmcblk0p22
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 boot -> /dev/block/mmcblk0p34
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 cache -> /dev/block/mmcblk0p38
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 cmnlib -> /dev/block/mmcblk0p25
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 cmnlibbak -> /dev/block/mmcblk0p27
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 devinfo -> /dev/block/mmcblk0p17
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 dpo -> /dev/block/mmcblk0p28
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 frp -> /dev/block/mmcblk0p41
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 fsc -> /dev/block/mmcblk0p29
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 fsg -> /dev/block/mmcblk0p18
lrwxrwxrwx 1 root root   20 1970-01-01 21:51 hyp -> /dev/block/mmcblk0p6
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 hypbak -> /dev/block/mmcblk0p15
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 keymaster -> /dev/block/mmcblk0p24
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 keymasterbak -> /dev/block/mmcblk0p26
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 keystore -> /dev/block/mmcblk0p40
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 limits -> /dev/block/mmcblk0p19
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 metadata -> /dev/block/mmcblk0p33
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 misc -> /dev/block/mmcblk0p39
lrwxrwxrwx 1 root root   20 1970-01-01 21:51 modem -> /dev/block/mmcblk0p1
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 modemst1 -> /dev/block/mmcblk0p20
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 modemst2 -> /dev/block/mmcblk0p21
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 msadp -> /dev/block/mmcblk0p23
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 oem -> /dev/block/mmcblk0p36
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 oeminfo -> /dev/block/mmcblk0p31
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 persist -> /dev/block/mmcblk0p32
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 persistent -> /dev/block/mmcblk0p42
lrwxrwxrwx 1 root root   20 1970-01-01 21:51 pmic -> /dev/block/mmcblk0p7
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 pmicbak -> /dev/block/mmcblk0p11
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 recovery -> /dev/block/mmcblk0p35
lrwxrwxrwx 1 root root   20 1970-01-01 21:51 rpm -> /dev/block/mmcblk0p5
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 rpmbak -> /dev/block/mmcblk0p14
lrwxrwxrwx 1 root root   20 1970-01-01 21:51 sbl1 -> /dev/block/mmcblk0p2
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 sbl1bak -> /dev/block/mmcblk0p12
lrwxrwxrwx 1 root root   20 1970-01-01 21:51 sdi -> /dev/block/mmcblk0p3
lrwxrwxrwx 1 root root   20 1970-01-01 21:51 sec -> /dev/block/mmcblk0p9
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 ssd -> /dev/block/mmcblk0p30
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 system -> /dev/block/mmcblk0p43
lrwxrwxrwx 1 root root   20 1970-01-01 21:51 tz -> /dev/block/mmcblk0p4
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 tzbak -> /dev/block/mmcblk0p13
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 userdata -> /dev/block/mmcblk0p44
lrwxrwxrwx 1 root root   21 1970-01-01 21:51 vendor -> /dev/block/mmcblk0p37
angler:/ # cp -r /dev/block/mmcblk0p34 /sdcard/
cp -r /dev/block/mmcblk0p34 /sdcard/
cp: /sdcard//mmcblk0p34: Operation not permitted
1|angler:/ #

我这里的文件是权限是777 而且在root ，为啥复制不了到sdcard