mount options for selectively disabling parts of CIFS Unix Extensions

Steve French smfrench at
Mon Jul 16 23:11:02 GMT 2007

I would like opinions on how to handle a specific use question ...

if the user has mounted e.g.  \\server1\shareA (e.g. on a Samba
server) using defaults (and thus gotten support for the Unix
Extensions, but then does a second mount trying to disable Unix
Extensions (e.g. "mount -t cifs //server1/shareB /mnt -o nounix" then
what should the result be:

1) mount fails?  If so what return code - there is no easy way to pass
error strings back across mount (get_sb returns an int - a posix
return code)

2) mount succeeds, ignoring the "nounix" option but prints a warning to dmesg

3) mount succeeds but turns off the Unix Capability bits so no Unix
Extension requests are sent on either shareA or shareB (although the
server behavior will still be a little different than if the client
had not negotiated Unix Extensions at all, at least it will be
different unless the session drops and is reconnected at which time
the server will see the Unix Extensions disabled)

4) mount succeeds and no Unix Extension requests are sent on the tree
id for shareB (the requests to shareA are unaffected)



On 7/16/07, Steve French <smfrench at> wrote:
> I have seen various requests from users to disable part of the CIFS
> Unix Extensions on mount

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