VirtualBox: vboxsf filesystem wrongly detected as readonly?

I have VirtualBox (Windows XP host) running a CentOS 6.0 virtual machine, with one shared folder.

Here is the list of mounted devices:

[root@localhost ~]# mount -l
...
www on /media/sf_www type vboxsf (gid=501,rw)

Looks like it’s read/write.

Now if I try to write on this shared folder:

[root@localhost ~]# touch /media/sf_www/test
touch: cannot touch `/media/sf_www/test': Read-only file system

Any idea about what I’m doing wrong?

Edit: just tried to manually mount it elsewhere, same problem:

[root@localhost ~]# mount.vboxsf -w www /mnt/www
[root@localhost ~]# mount -l
...
www on /media/sf_www type vboxsf (gid=501,rw)
www on /mnt/www type vboxsf (rw)
[root@localhost ~]# touch /mnt/www/test
touch: cannot touch `/mnt/www/test': Read-only file system

Note: the www folder is writeable on my host machine.

– Answer –

• 5 December 2011: Answer by Benjamin for VirtualBox: vboxsf filesystem wrongly detected as readonly? -

  Ok, I found the solution. Actually, I changed my shared folder from readonly to "read/write" while the machine was running, then rebooted the machine.

  The solution was simply to properly shut down the machine, then start it again.

• 5 December 2011: VirtualBox: vboxsf filesystem wrongly detected as readonly? -

  I have VirtualBox (Windows XP host) running a CentOS 6.0 virtual machine, with one shared folder.

  Here is the list of mounted devices:

  [root@localhost ~]# mount -l
  ...
  www on /media/sf_www type vboxsf (gid=501,rw)
  

  Looks like it's read/write.

  Now if I try to write on this shared folder:

  [root@localhost ~]# touch /media/sf_www/test
  touch: cannot touch `/media/sf_www/test': Read-only file system
  

  Any idea about what I'm doing wrong?

  Edit: just tried to manually mount it elsewhere, same problem:

  [root@localhost ~]# mount.vboxsf -w www /mnt/www
  [root@localhost ~]# mount -l
  ...
  www on /media/sf_www type vboxsf (gid=501,rw)
  www on /mnt/www type vboxsf (rw)
  [root@localhost ~]# touch /mnt/www/test
  touch: cannot touch `/mnt/www/test': Read-only file system
  

  Note: the www folder is writeable on my host machine.

This entry was posted on Monday, December 5th, 2011 at 5:24 pm and is filed under server. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.