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

[Wilhelm Meier]

Am Samstag, 30. August 2008 schrieb 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

Thanks.

If anyone is interested: here is a (small) patch which makes kmail 
happy ;-)

-- 
Wilhelm
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