Are VFS modules stackable?

Jiri Sasek jiri.sasek at
Mon Apr 7 11:39:12 MDT 2014

Hi all,

SAM-QFS 5.3 has NFSv4 ACL (based on Solaris acl(2) interface   
...similar to ZFS) so I was testing the following (share) configuration:

    path = /samfs1/.....
    comment = SAM-QFS share
    browseable = yes
    readonly = no
    inherit permissions = yes
    inherit acls = yes
    acl map full control = no
    dos filemode = yes
; To store the DOS attributes in extended attributes.

; set the VFS module
    vfs objects = zfsacl

;  store the alternate data stream in ext-attributes
    vfs objects = streams_xattr

;  AIO
    aio read  size = 1
    aio write size = 1
    vfs objects = aio_pthread

; Off-line files support
    vfs objects = samfs

...and it looks only *one* module (first used  ...Solaris uses lazy-load 
by default) was available / share.

Did I configured anything wrong or only one/share VFS module is 
available in Samba?

Please correct me if I am wrong but I remember something like a 
opaque/transparent calls in VFS modules I was convinced about 
stack-ability of VFS modules.

Thak you in advance,


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