So, in fact, both ganesha and samba can have the same file open at the
same time (just as any 2 processes can). This will, of course, cause
issues if both are modifying the same sections of the file. This is why
file locking was invented. NFSv3 (via NLM) and NFSv4 (built in) have
locking modes that are compatible with SMB locking, so as long as the
clients use those, it "should" work fine. Of course, there's going to
be issues, since this isn't tested well (or maybe at all). I have some
idea that the Gluster team at one point tested this; they support
exporting Gluster from both ganesha and samba, although I don't believe
they support exporting the same FS at the same time.
So the short answer is that it theoretically can work, and it actually
may work, but it likely won't, without some work.
Daniel
On 03/06/2018 01:01 PM, Pradeep wrote:
Hi Daniel,
What I meant is a use case where some one needs to access the same
export through NFS protocol using Ganesha server and SMB protocol using
Samba server. Both Samba and Ganesha are running on the same server.
Obviously, file can't be open by both ganesha and samba; so we need to
close the open FDs (if those are for caching). Linux provides oplock
(fcntl() with F_SETLEASE) for processes to get notification on other
processes trying to open and this can be used to synchronize with Samba.
Samba seems to support this already:
https://github.com/samba-team/samba/blob/master/source3/smbd/oplock_linux.c
Thanks,
On Tue, Mar 6, 2018 at 9:29 AM, Daniel Gryniewicz <d...@redhat.com
<mailto:d...@redhat.com>> wrote:
Ganesha has multi-protocol (NFS3, NFS4, and 9P). There are no plans
to add CIFS, since that is an insanely complicated protocol, and has
a userspace daemon implementation already (in the form of Samba). I
personally wouldn't reject such support if it was offered, but as
far as I know, no one is even thinking about working on it.
Daniel
On 03/06/2018 12:20 PM, Pradeep wrote:
Hello,
Is there plans to implement multiprotocol (NFS and CIFS
accessing same export/share) in ganesha? I believe current FD
cache will need changes to support that.
Thanks,
Pradeep
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