LinuxQuestions.org - permission problems with mounted device

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permission problems with mounted device

Why is the ownership changing after mounting the filesystem? I never had this problem before.

Code:

chris@ubuntu:~$ sudo chown -c chris:root /media/sdc1/

chris@ubuntu:~$ ll /media/

total 40K

lrwxrwxrwx 1 root  root    6 2007-11-26 13:05 cdrom -> cdrom1

drwxr-xr-x 2 root  root 4.0K 2007-11-26 13:03 cdrom0

drwxr-xr-x 2 root  root 4.0K 2007-05-31 22:31 cdrom1

drwxr-xr-x 2 chris root 4.0K 2007-07-20 08:38 iso

drwxrwxrwx 1 root  root 8.0K 2007-12-25 10:51 sdb1

drwxrwxrwx 1 root  root  12K 2007-12-25 13:11 sdb2

drwxr-xr-x 5 chris root 4.0K 2007-12-24 03:23 sdb3

drwxr-xr-x 2 chris root 4.0K 2007-12-26 03:41 sdc1

chris@ubuntu:~$ sudo mount /dev/sdc1 /media/sdc1/

chris@ubuntu:~$ ll /media/

total 40K

lrwxrwxrwx 1 root  root    6 2007-11-26 13:05 cdrom -> cdrom1

drwxr-xr-x 2 root  root 4.0K 2007-11-26 13:03 cdrom0

drwxr-xr-x 2 root  root 4.0K 2007-05-31 22:31 cdrom1

drwxr-xr-x 2 chris root 4.0K 2007-07-20 08:38 iso

drwxrwxrwx 1 root  root 8.0K 2007-12-25 10:51 sdb1

drwxrwxrwx 1 root  root  12K 2007-12-25 13:11 sdb2

drwxr-xr-x 5 chris root 4.0K 2007-12-24 03:23 sdb3

drwxr-xr-x 4 root  root 4.0K 1969-12-31 18:00 sdc1

chris@ubuntu:~$

You can do whatever you want to that /media/sdc1 directory and when you mount something on top of it it will get clobbered, so of course the perms change.

Look into using udev to set your perms when the filesystem is mounted.

Here is a link to get you started...
http://reactivated.net/writing_udev_rules.html

when you mount a drive in linux, it assumes the permissions of the one who mounted it. In your case its root.

Other permissions such as read and write, are also set by mounting options.