How do I get all the mount point information for an Android device programmatically?
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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
Sam Morris
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1"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. – sdf3qrxewqrxeqwxfew3123 Nov 25 '14 at 18:39
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Yes, this is merely an explanatory observation. It is not valid to assume this will be the case on different devices. – Sam Morris Mar 13 '16 at 10:57
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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.
Chris Stratton
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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 . – Nohsib Jul 26 '11 at 03:28
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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. – Chris Stratton Jul 26 '11 at 03:33
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thankyou Chris..would you happen to know the answer to this : http://stackoverflow.com/q/6824604/530993 – Nohsib Jul 26 '11 at 03:35
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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
Monika Singh
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/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.
howard
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