I've set up a CIFS mount on my CentOS 6.4 server with autofs :

File /etc/auto.mnt :

Photos -fstype=cifs,perm,rw,uid=505,forceuid,gid=505,forcegid,file_mode=0770,dir_mode=0770,credentials=/root/credentials.txt ://adsrv01/Photos

What a ls command shows :

[root@websrv01 mnt]# ls -l
total 4
drwxr-xr-x 1 root root 4096 Apr 26 12:01 Photos

What I expect from the ls command :

[root@websrv01 mnt]# ls -l
total 4
drwxrwx--- 1 photos photos 4096 Apr 26 12:01 Photos

Do you see anything wrong ? How can I set owner and chmod right ?

Edit : I forgot to say that chown and chmod commands are denied for root user on the /mnt/Photos directory. I can't get it right, and I also tried using fstab.

This is what happens with fstab :

mkdir /mnt/Photos
chmod 770 /mnt/Photos
chown photos:photos /mnt/Photos
mount /mnt/Photos

The permissions are automatically changed and set to 755 when the directory is mounted. I can't set the mode back to 770 : permission denied.

2 Answers 2


I found the answer : you have to use the option nounix together with file_mode and dir_mode

Here is my fstab :

//adsrv01/Photos      /mnt/Photos           cifs    credentials=/root/credentials.txt,file_mode=0770,dir_mode=0770,nounix,uid=505,gid=505 0 0
  • 5
    fstab is not autofs... Jun 16, 2016 at 18:39

I've been just able to get a sane working setup, partly thanks to your answer @mimipc, but I'm sharing here a more complete description.

My rPI is called malinovka.daonet.home in my /etc/fstab. On both server and client, I have netvor user, and I want to use a single share from the client to both read and write to a single share.

To export the share from the malinovka rpi, I've added this section to the smb.conf:

   comment = netvorovo
   public = no
   writeable = yes
   browsable = yes
   path = /path/to/netvorovo
   create mask = 0644
   directory mask = 0755

and "created user" (that is, even if the netvor user is already created, I need to "create" it again for samba):

smbpasswd -a netvor

(I've just generated strong password that is only used for samba).

On the client, I have three files under /etc/auto.master.d:

  • malinovka.autofs:

    /-  /etc/auto.master.d/malinovka.map --timeout=300
  • malinovka.map:

    /mnt/netvorovo    -fstype=cifs,credentials=/etc/auto.master.d/malinovka.credentials,uid=9860,gid=9860,file_mode=0640,dir_mode=0750,nounix ://malinovka.daonet.home/netvorovo
  • and malinovka.credentials:


At this point, logged in as netvor, I can just create files/dirs on /mnt/netvorovo and the default modes are as usual.

  • I just tried adding this to my working autofs.direct entry but it made no difference: ,uid=9860,gid=9860,file_mode=0640,dir_mode=0750,nounix Sep 12, 2021 at 7:23
  • Silly me - I forgot to run sudo service autofs restart. Now it works. I can enjoy proper dir_colors now, not non-executable files being bold and flourescent. Sep 12, 2021 at 7:38

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