On RHEL4 creating a new file on a CIFS mount ignores the fmask/file_mode and uses the system umask instead.

Issue

• Creating a new file on a CIFS mount ignores the fmask or file_mode and uses the system umask instead.
• Remounting the CIFS mount will resolve any permissions problems encountered.
• smbfs mounts with the correct permissions:

root@hostname:~# cat /etc/fstab | grep smbfs
//192.168.1.23/TEST /mnt smbfs gid=users,fmask=0660,dmask=0770,username=xxxx,password=xxxx 0 0

root@hostname:~# mount /mnt ; cd /mnt/test

root@hostname:/mnt/test# touch test_smbfs ; ls -l test_smbfs
-rw-rw---- 1 root users 0 2012-07-05 18:45 test_smbfs

• An example of the same process completed with CIFS can be found below, note how the file_mode is not correctly applied:

root@hostname:/# cat /etc/fstab | grep cifs
//192.168.1.23/TEST /mnt cifs gid=users,file_mode=0660,dir_mod=0770,username=xxxx,password=xxxx 0 0

root@hostname:/# mount /mnt ; cd /mnt/test

root@hostname:/mnt/test# touch test_cifs ; ls -l test_cifs
-rw-r--r-- 1 root users 0 2012-07-05 18:47 test_cifs

• However, a remount via CIFS will fix the permission problems:

root@hostname:/mnt/test# cd / ; umount /mnt
root@hostname:/# mount /mnt ; cd /mnt/test

root@hostname:/mnt/test# ls -l test_cifs
-rw-rw---- 1 root users 0 2012-07-05 18:47 test_cifs