[linux-cifs-client] CIFS and rename of open files

[Jeff Layton]

On Sat, 30 Aug 2008 06:49:27 -0400
Jeff Layton <jlayton at redhat.com> wrote:

> On Fri, 25 Jul 2008 19:39:14 +0200
> Wilhelm Meier <wilhelm.meier at fh-kl.de> wrote:
> 
> > Hello again,
> > 
> > here comes a minimal test program what does essentially the same as 
> > kmail does:
> > 
> > open to files
> > leave them open
> > rename the first as the second -> permission denied on cifs
> > 
> > This works as expected on local fs like ext2/3, but not on a 
> > cifs-share.
> > 
> > This is the version information:
> > 
> > Display Internal CIFS Data Structures for Debugging
> > ---------------------------------------------------
> > CIFS Version 1.52
> > Active VFS Requests: 0
> > Servers:
> > 1) Name: 192.168.32.12  Domain: KMUX Mounts: 1 OS: Unix
> >         NOS: Samba 3.0.24       Capability: 0x80f3fd
> >         SMB session status: 1   TCP status: 1
> >         Local Users To Server: 1 SecMode: 0x3 Req On Wire: 0
> > MIDs:
> > 
> > Shares:
> > 1) \\192.168.32.12\hugo.tester Uses: 1 Type: NTFS DevInfo: 0x0 
> > Attributes: 0x2b
> > PathComponentMax: 255 Status: 1 type: 0
> > 
> > I would be _very_ happy, I you can give me a solution to this 
> > problem!!!
> > 
> > TIA,
> > 
> > Wilhelm
> > 
> > Am Montag, 30. Juni 2008 schrieb Jeff Layton:
> > > On Wed, 25 Jun 2008 09:52:23 +0200
> > >
> > > Wilhelm Meier <wilhelm.meier at fh-kl.de> wrote:
> > > > Hello Jeff,
> > > >
> > > > Am Freitag, 6. Juni 2008 schrieb Wilhelm Meier:
> > > > > Am Freitag, 6. Juni 2008 schrieb Jeff Layton:
> > > > > > On Fri, 6 Jun 2008 10:49:26 +0200
> > > > > >
> > > > > > Wilhelm Meier <wilhelm.meier at fh-kl.de> wrote:
> > > > > > > Hello,
> > > > > > >
> > > > > > > are there any news to the issue of renaming open files -
> > > > > > > because this missing feature is preventing the use of cifs
> > > > > > > as user homes on linux systems.
> > > > > >
> > > > > > I was looking at the problem earlier this week, but haven't
> > > > > > gotten all the way to a solution. The issue is very dependent
> > > > > > on server behavior, with windows servers being particularly
> > > > > > problematic. I've been doing some experimentation, but
> > > > > > haven't found a solution that seems to work well for all
> > > > > > cases.
> > > >
> > > > is there any progess or activity from your side? I'm asking
> > > > because this is a show-stopper using cifs-homes for users with
> > > > newer kmail-versions.
> > > > Or do you know any workaround in this respect?
> > >
> > > I'm afraid that I've been sidetracked into other things and haven't
> > > had time to touch this. The problem is (I think) that CIFS
> > > currently tries to set the DELETE_ON_CLOSE bit using the create
> > > flags in the open call, but this only works if the file is actually
> > > being created. So we need to set the bit with a SET_FILE_INFO call
> > > and then try to rename it.
> > >
> > > I'm probably wrong on some of this though, this turns out to be a
> > > rather tricky situation to handle correctly, and it will probably
> > > take some experimentation to get it right. I don't know of any
> > > workarounds for this at the moment...
> > >
> > > > > Sorry for being unclear here: I mean linux-cifs in combination
> > > > > with samba-server
> > 
> > 
> > 
> 
> I may try to give a crack at this soon. It looks like someone else
> reported this problem in this samba BZ ticket:
> 
> https://bugzilla.samba.org/show_bug.cgi?id=5534
> 
> I went ahead and attached your test program to it and assigned the case
> to myself. You may want to cc yourself on this bug as I'll probably try
> to put updates in there as I work on it.
> 

Oops, I mean this BZ:

https://bugzilla.samba.org/show_bug.cgi?id=5431

-- 
Jeff Layton <jlayton at redhat.com>