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linux - CIFS mounted drive setting "stick-bit" on all files, cannot change permissions or modify files



I have a folder mounted on an Ubuntu 8.10 sever through cifs that I simply cannot change the permissions on once mounted.




Here is a breakdown of what's going on:




  • All files within the mounted folder automatically have their permissions set to -rwxrwSrwx regardless of whether the file is create on the windows server or on the linux machine.

  • I have the same directory mounted on two other linux servers (both running 9.10 instead of 8.10) with no problems at all. They all are using the same fstab options and the same credentials.



    //server/folder /media/backups cifs credentials=/etc/samba/.arcadia_cred,noexec,noserverino 0 0


  • I've I run a chmod command a million different ways, all of which report successfully changing the permissions. However it doesn't.


  • The issue began after I updated from 8.04 to 8.10




Any idea why this may be happening on one machine? Since it started after an upgrade I'm not sure what is the bes thing to do.



Any help you could give would great! None of my automated backup scripts are working because of this!


Answer



What OS is the server? Does it support CIFS Unix extensions? If not then nothing you do with chmod matters. You can set the user owner, file and directory permissions by setting options within your mount.



http://linux.die.net/man/8/mount.cifs





uid=arg
sets the uid that will own all
files on the mounted filesystem. It
may be specified as either a username
or a numeric uid. This parameter is
ignored when the target server
supports the CIFS Unix extensions.



gid=arg
sets the gid that will own all
files on the mounted filesystem. It
may be specified as either a groupname

or a numeric gid. This parameter is
ignored when the target server
supports the CIFS Unix extensions.



file_mode=arg
If the server does not
support the CIFS Unix extensions this
overrides the default file mode.



dir_mode=arg

If the server does not
support the CIFS Unix extensions this
overrides the default mode for
directories.



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