EXTERNAL_STORAGE doesn't match with "df" output on Samsung Arndale Android.

[Botao]

For the SD MMC test on Samsung Arndale board, with Linaro Android build #386:

https://android-build.linaro.org/builds/~linaro-android/linux-linaro-arndale/#build=386

The value of EXTERNAL_STORAGE doesn't match with the output of "df":

root@arndale:/ # df
Filesystem Size Used Free Blksize
/dev 1000.6M 164.0K 1000.4M 4096
/mnt/asec 1000.6M 0.0K 1000.6M 4096
/mnt/obb 1000.6M 0.0K 1000.6M 4096
/system 739.9M 371.1M 368.8M 4096
/cache 243.9M 2.0M 241.9M 1024
/data 487.8M 51.4M 436.4M 1024
/mnt/media_rw/sdcard0 5.8G 12.0K 5.8G 4096
/mnt/secure/asec 5.8G 12.0K 5.8G 4096

root@arndale:/ # echo $EXTERNAL_STORAGE
/storage/sdcard0
root@arndale:/ #

"/storage/sdcard0" is not in the output of "df". According to the output, the storage seems locates at "/mnt/media_rw/sdcard0", and I couldn't see there is any symbol link between them:

root@arndale:/ # busybox ls -ld /mnt/media_rw/sdcard0
drwxrwx--- 4 media_rw media_rw 4096 Jan 1 00:01 /mnt/media_rw/sdcard0

root@arndale:/ # busybox ls -ld /storage/sdcard0
drwx------ 2 root root 0 Jan 1 00:00 /storage/sdcard0
root@arndale:/ #

However, data can be successfully written to /storage/sdcard0:

root@arndale:/ # written_message="abcdefghijklmn"
root@arndale:/ # echo $written_message > $EXTERNAL_STORAGE/sd-mmc-test.txt
root@arndale:/ # echo $?
0
root@arndale:/ # cat $EXTERNAL_STORAGE/sd-mmc-test.txt
abcdefghijklmn
root@arndale:/ # cd /storage/sdcard0
root@arndale:/storage/sdcard0 # ls
sd-mmc-test.txt
root@arndale:/storage/sdcard0 #

Though file "sd-mmc-test.txt" doesn't exist under "/mnt/media_rw/sdcard0"

root@arndale:/storage/sdcard0 # cd /mnt/media_rw/sdcard0
root@arndale:/mnt/media_rw/sdcard0 # ls
LOST.DIR
root@arndale:/mnt/media_rw/sdcard0 #

The output from "mount" are:

root@arndale:/data # mount
rootfs / rootfs rw,relatime 0 0
tmpfs /dev tmpfs rw,nosuid,relatime,mode=755 0 0
devpts /dev/pts devpts rw,relatime,mode=600 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,relatime 0 0
tmpfs /mnt/asec tmpfs rw,relatime,mode=755,gid=1000 0 0
tmpfs /mnt/obb tmpfs rw,relatime,mode=755,gid=1000 0 0
/dev/block/mmcblk1p3 /system ext4 rw,relatime,data=ordered 0 0
/dev/block/mmcblk1p5 /cache ext4 rw,nosuid,nodev,noatime,errors=panic,data=ordered 0 0
/dev/block/mmcblk1p6 /data ext4 rw,nosuid,nodev,noatime,errors=panic,data=ordered 0 0
/dev/block/vold/179:39 /mnt/media_rw/sdcard0 vfat rw,dirsync,nosuid,nodev,noexec,relatime,uid=1023,gid=1023,fmask=0007,dmask=0007,allow_utime0
/dev/block/vold/179:39 /mnt/secure/asec vfat rw,dirsync,nosuid,nodev,noexec,relatime,uid=1023,gid=1023,fmask=0007,dmask=0007,allow_utime=00200
root@arndale:/data #

"/mnt/media_rw/sdcard0" is in output but no "/storage/sdcard0".

Something wrong in the output of these storage partitions?

#####################################
For Samsung Arndale Android, this issue reproduced on following images:
https://android-build.linaro.org/builds/~linaro-android/linux-linaro-arndale/#build=386
https://android-build.linaro.org/builds/~linaro-android/arndale-linaro-14.03-release/#build=1
https://android-build.linaro.org/builds/~linaro-android/linux-linaro-arndale/#build=415
https://android-build.linaro.org/builds/~linaro-android/arndale-linaro-14.04-release/#build=1
https://android-build.linaro.org/builds/~linaro-android/linux-linaro-arndale/#build=447
https://android-build.linaro.org/builds/~linaro-android/arndale-linaro-14.05-release/#build=1
https://android-build.linaro.org/builds/~linaro-android/linux-linaro-arndale/#build=473
https://android-build.linaro.org/builds/~linaro-android/arndale-linaro-14.06-release/#build=1
https://android-build.linaro.org/builds/~linaro-android/linux-linaro-arndale/#build=502

[Soumya Basak (soumya-basak)]

The issue reproduced with Linaro Android kitkat 14.03 Release Candidate for Galaxy Nexus builds:

https://android-build.linaro.org/builds/~linaro-android/galaxynexus-linaro-14.03-release/#build=1

verified SD-MMC test cases:

https://wiki.linaro.org/Platform/QA/TestCases/Android#SD_.2F_MMC

root@maguro:/ # df
Filesystem Size Used Free Blksize
/dev 346.9M 136.0K 346.8M 4096
/sys/fs/cgroup 346.9M 12.0K 346.9M 4096
/mnt/asec 346.9M 0.0K 346.9M 4096
/mnt/obb 346.9M 0.0K 346.9M 4096
/system 503.9M 359.5M 144.4M 4096
/factory 19.7M 8.1M 11.6M 4096
/cache 425.2M 7.1M 418.1M 4096
/data 13.3G 424.1M 12.9G 4096
/mnt/shell/emulated 13.3G 424.1M 12.9G 4096
root@maguro:/ #

root@maguro:/ # echo $EXTERNAL_STORAGE
/storage/emulated/legacy
root@maguro:/ #

/storage/emulated/legacy is not in the output of "df".

However, data can be successfully written to /storage/emulated/legacy

root@maguro:/ # written_message="abcdefghijklmn"
 root@maguro:/ # echo $written_message > $EXTERNAL_STORAGE/sd-mmc-test.txt
 root@maguro:/ # echo $?
0
root@maguro:/ # cat $EXTERNAL_STORAGE/sd-mmc-test.txt
abcdefghijklmn
root@maguro:/ # cd $EXTERNAL_STORAGE
root@maguro:/storage/emulated/legacy # ls

sd-mmc-test.txt

df output Filesystem does not match with $EXTERNAL_STORAGE Partitions.

Reproduced the issue with:

https://android-build.linaro.org/builds/~linaro-android/galaxynexus-linaro-14.01-release/#build=2
https://android-build.linaro.org/builds/~linaro-android/galaxynexus-linaro-14.02-release/#build=11

[Soumya Basak (soumya-basak)]

the issue reproduced with Linaro Android 14.04 galaxy nexus build:

https://android-build.linaro.org/builds/~linaro-android/galaxynexus-14.04-release/#build=1

as described on comment #1.

[Milosz Wasilewski (mwasilew)]

Botao,
Please move this bug to Linaro bugzilla and close here.

[Botao (botao-sun)]

Done, bug has been moved to this one:

https://bugs.linaro.org/show_bug.cgi?id=244