монтировать образ диска и дать юзерам возможность писать на него

[root@laptop temp]#
[root@laptop temp]# ls -la
total 20516
drwxrwxr-x 3 test test 4096 2008-07-27 21:59 ./
drwx------ 27 test test 4096 2008-07-27 22:21 ../
-rw-r--r-- 1 test test 20971520 2008-07-27 22:14 disk.img
drwxr-xr-x 2 test test 4096 2008-07-27 21:59 music/
[root@laptop temp]# cat /etc/fs
fstab fstab~ fstab.rpmnew
[root@laptop temp]# cat /etc/fstab
<snip>
/home/test/temp/disk.img /home/test/temp/music ext3 loop 0 0
[root@laptop temp]# mount music/
[root@laptop temp]# su test
[test@laptop temp]$ touch music/x.txt
touch: cannot touch `music/x.txt': Permission denied
[test@laptop temp]$ ls -la
total 20513
drwxrwxr-x 3 test test 4096 2008-07-27 21:59 ./
drwx------ 27 test test 4096 2008-07-27 22:23 ../
-rw-r--r-- 1 test test 20971520 2008-07-27 22:14 disk.img
drwxr-xr-x 3 root root 1024 2008-07-27 22:14 music/