How do I get all the mount point information for an Android device programmatically?
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5 Answers
You can see the partitions known to the system by examining /proc/partitions. From my HTC Desire:
major minor #blocks name 31 0 640 mtdblock0 31 1 4608 mtdblock1 31 2 3072 mtdblock2 31 3 256000 mtdblock3 31 4 40960 mtdblock4 31 5 151168 mtdblock5 179 0 3872256 mmcblk0 179 1 2872070 mmcblk0p1 179 2 1000185 mmcblk0p2 The mtdblock devices are the phone's internal flash storage. mmcblk0 is the phone's SD card.
The best way to see what is mounted where is to examine /proc/self/mountinfo. This is better than /proc/mounts because the latter misses certain information. Again, on my HTC Desire (I added column headings and ran the output through column -s for good measure):
ID PARENT BLOCK ROOT MOUNTPOINT OPTIONS - TYPE SOURCE SUPEROPTS 1 1 0:1 / / ro,relatime - rootfs rootfs ro 11 1 0:11 / /dev rw,relatime - tmpfs tmpfs rw,mode=755 12 11 0:9 / /dev/pts rw,relatime - devpts devpts rw,mode=600 13 1 0:3 / /proc rw,relatime - proc proc rw 14 1 0:12 / /sys rw,relatime - sysfs sysfs rw 15 1 0:13 / /acct rw,relatime - cgroup none rw,cpuacct 16 1 0:14 / /mnt/asec rw,relatime - tmpfs tmpfs rw,mode=755,gid=1000 17 1 0:15 / /mnt/obb rw,relatime - tmpfs tmpfs rw,mode=755,gid=1000 18 11 0:16 / /dev/cpuctl rw,relatime - cgroup none rw,cpu 19 1 31:3 / /system ro,relatime - yaffs2 /dev/block/mtdblock3 ro 20 1 31:5 / /data rw,nosuid,nodev,relatime - yaffs2 /dev/block/mtdblock5 rw 21 1 31:4 / /cache rw,nosuid,nodev,relatime - yaffs2 /dev/block/mtdblock4 rw 22 21 31:5 /local/download /cache/download rw,nosuid,nodev,relatime - yaffs2 /dev/block/mtdblock5 rw 23 1 179:2 / /sd-ext rw,nosuid,nodev,noatime,nodiratime - ext4 /dev/block/mmcblk0p2 rw,commit=19,barrier=0,data=writeback 24 20 179:2 /app /data/app rw,nosuid,nodev,noatime,nodiratime - ext4 /dev/block/mmcblk0p2 rw,commit=19,barrier=0,data=writeback 25 20 179:2 /data /data/data rw,nosuid,nodev,noatime,nodiratime - ext4 /dev/block/mmcblk0p2 rw,commit=19,barrier=0,data=writeback 26 14 0:6 / /sys/kernel/debug rw,relatime - debugfs /sys/kernel/debug rw 27 1 179:1 / /mnt/sdcard rw,nosuid,nodev,noexec,relatime - vfat /dev/block/vold/179:1 rw,dirsync,uid=1000,gid=1015,fmask=0602,dmask=0602,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 28 1 179:1 /.android_secure /mnt/secure/asec rw,nosuid,nodev,noexec,relatime - vfat /dev/block/vold/179:1 rw,dirsync,uid=1000,gid=1015,fmask=0602,dmask=0602,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro 29 27 0:17 / /mnt/sdcard/.android_secure ro,relatime - tmpfs tmpfs ro,size=0k,mode=000 
2 Comments
sdf3qrxewqrxeqwxfew3123
"The mtdblock devices are the phone's internal flash storage. mmcblk0 is the phone's SD card.". Doesn't seem to be a valid assumption. On my tablet (Dell Venue 7) which has both internal memory and SD Card there are only mcc* partitions.
Sam Morris
Yes, this is merely an explanatory observation. It is not valid to assume this will be the case on different devices.
Not exactly part of the android apis, but the underlying linux will tell you about the ones that are in use if you read /proc/mounts
As a clarification, in later Android versions Linux's ability to have unique mounts for each process ancestry is leveraged, so the mounts seen by an application process can (and typically will) be different than those seen by something launched from ADB, or a core system process.
3 Comments
Nohsib
How to comprehend these values obtained from /proc/mounts --->rootfs / rootfs ro,relatime 0 0 tmpfs /dev tmpfs rw,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 .
Chris Stratton
Read the kernel sources or just figure it out from known entires: it appears to be {device, mountpoint, type, options, etc...} but there's no guarantee that won't change at some point.
Nohsib
thankyou Chris..would you happen to know the answer to this : stackoverflow.com/q/6824604/530993
adb shell df -h
Example
Filesystem Size Used Avail Use% Mounted on tmpfs 3.6G 1.1M 3.6G 1% /dev tmpfs 3.6G 0 3.6G 0% /mnt 
Comments
/proc/mtd
or on other phones:
/proc/emmc
This will show all the partitions and their names - which may or may not currently be mounted.
