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BigWaveDave 11-28-2007 12:16 PM
automounting USB Flash Drive
 
I'm wondering if anyone has tackled the issue of having a USB flash drive automatically mount to the file system when it is inserted? I am working on a TI DM355 DaVinci EVM board running MontaVista Linux 4.0.1.

I can do this manually easily enough by:

mkdir /mnt/usbflash
mount /dev/sda1 /mnt/usbflash

To make this mount occur automatically, I *think* that I need to use autofs to do this, but if that's wrong I'd like to know.

Using autofs, here is what I did...

I inserted the following into /etc/auto.master:
/mnt/usbflash /etc/auto.usbflash --timeout=30 --ghost

I inserted the following into /etc/auto.usbflash:
usbflash -fstype=auto,sync :/dev/sda1

I then:
mkdir /mnt/usbflash
/etc/init.d/autofs restart

and this appeared to work. But for some reason, the directory /mnt/usbflash was mysteriously deleted. And inserting the USB stick does not force an automatic mount.

Any suggestions?
Thanks in advance.

shadowsnipes 11-28-2007 05:48 PM
You might want to explore udev as well...

rsashok 11-28-2007 06:08 PM
I am not sure about MontaVista, but normally all these stuff is in /etc/fstabs.

kennithwang 12-02-2007 09:37 PM
What is kernel version of MontaVista Linux 4.0.1?

BigWaveDave 12-05-2007 01:06 AM
Kernel Version
 
The kernel version is 2.6.10.

schneidz 12-05-2007 11:20 AM
im not sure if this is elegant but you can waste negligible processor cycles by doing something like:
[untested]
Code:
while [ 1 ]
do
 mnt=`dmesg | tail | grep usb` # my system spits out the make/ model of the usb thumb drive when i insert it
 if [ mnt ]
 then
  mount /mnt/point /dir
 fi
done
[/untested]

shadowsnipes 12-05-2007 11:37 AM
Check this page out about writing udev rules.

http://reactivated.net/writing_udev_rules.html

Peter_APIIT 12-11-2007 12:58 AM
You can download a program called automount and this program will automatically mount a usb flsh drive for you without any edit of /etc/fstab or script.

schneidz 12-11-2007 10:44 AM
Quote:
Originally Posted by Peter_APIIT (Post 2986805)
You can download a program called automount and this program will automatically mount a usb flsh drive for you without any edit of /etc/fstab or script.
this seems like the least abrasive solution. i've never looked at the source for automount but i suspect that it does the equivelent of :
Code:
while [ 1 ]
do
 mnt=`dmesg | tail | grep usb` # my system spits out the make/ model of the usb thumb drive when i insert it
 if [ mnt ]
 then
  mount /mnt/point /dir
 fi
done

elliott678 12-31-2007 08:03 PM
If you have udev, you could use something like this:
Code:
KERNEL=="sd[a-z]", NAME="%k", SYMLINK+="usb%m", GROUP="users", OPTIONS="last_rule"
ACTION=="add", KERNEL=="sd[a-z][0-9]", SYMLINK+="usb%n", GROUP="users", NAME="%k"
ACTION=="add", KERNEL=="sd[a-z][0-9]", RUN+="/bin/mkdir -p /mnt/usb%n"
ACTION=="add", KERNEL=="sd[a-z][0-9]", PROGRAM=="/lib/udev/vol_id -t %N", RESULT=="vfat", RUN+="/bin/mount -t vfat -o rw,noauto,flush,quiet,nodev,nosuid,noexec,noatime,dmask=000,fmask=111 /dev/%k /mnt/usb%n", OPTIONS="last_rule"
ACTION=="add", KERNEL=="sd[a-z][0-9]", RUN+="/bin/mount -t auto -o rw,noauto,sync,dirsync,noexec,nodev,noatime /dev/%k /mnt/usb%n", OPTIONS="last_rule"
ACTION=="remove", KERNEL=="sd[a-z][0-9]", RUN+="/bin/umount -l /mnt/usb%n"
ACTION=="remove", KERNEL=="sd[a-z][0-9]", RUN+="/bin/rmdir /mnt/usb%n", OPTIONS="last_rule"
It will probably need tweaking to work with your specific setup, this is my setup and it works very well.

edholdsworth 06-06-2008 09:34 AM
udev is the best approach
 
Depends on your version of Montavista but 5.0 has udev support and as people have contributed above this is the best way.


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