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Re: [linux-cifs-client] renaming open files on windows with CIFS

Subject: Re: [linux-cifs-client] renaming open files on windows with CIFS
From: Jeff Layton
Date: Tue, 2 Sep 2008 11:44:48 -0400
On Tue, 02 Sep 2008 08:18:32 -0700
George K Colley <gcolley@xxxxxxxxx> wrote:

> 
> On Sep 2, 2008, at 7:06 AM, Jeff Layton wrote:
> 
> > On Mon, 01 Sep 2008 18:49:56 -0700
> > George K Colley <gcolley@xxxxxxxxx> wrote:
> >
> >>
> >> On Sep 1, 2008, at 4:52 AM, Jeff Layton wrote:
> >>
> >>> CIFS already had an existing function called CIFSSMBRenameOpenFile
> >>> that
> >>> does a Trans2 rename. This function does not seem to work against  
> >>> any
> >>> open file that I've tested it against. Even using a modified cifs.ko
> >>> module that opens a file and tries to rename the FID to another name
> >>> always seems to fail no matter how I open the file.
> >> Not sure how the linux client implements this but the
> >> SMB_SFILEINFO_RENAME_INFORMATION call
> >> does work.
> >
> > Thanks, George...
> >
> > Looks like CIFS calls this SMB_SET_FILE_RENAME_INFORMATION (0x3f2),  
> > and
> > that looks like the same thing as SMB_SFILEINFO_RENAME_INFORMATION in
> > darwin.
> >
> >> It only allows you to rename the file, it does not support
> >> moving.
> >
> > I'm not sure what you mean by this...
> It can only be used to rename in place. You can not move the file to  
> another location.
> >
> >
> >> The Mac OS X
> >> Leopard code has this implemented. You could look at the darwin code
> >> to see how it is done.
> >
> > Looks like it mostly does the same thing as we do. The main difference
> > seems to be that the Linux CIFS client always sets the root_fid to 0
> > (which I presume means the root of the share)...
> >
> > I did a quick experiment where I tried to rename a file that was at  
> > the
> > root of the share (in which case root_fid should be 0, I think), but  
> > it
> > still didn't work (NT_STATUS_ACCESS_DENIED from the rename call).
> >
> > Is there a particular way that the FID being renamed needs to be  
> > opened?
> If the file is not open already with delete access then you will need  
> to do a new open on it with delete access:
> #define STD_RIGHT_DELETE_ACCESS         0x00010000
> 
> If this doesn't get me a tcpdump and I will look at it for you.
> 
> George
> >

I think that got me on the right track. Looks like I had several
problems...

1) the file definitely needed to be opened with DELETE access

2) when we're constructing the new filename, it had a preceding '\' and
windows was balking at that.

I need to do a bit more work to make sure this works, but I think I'm on
the right track now.

Many thanks!
-- 
Jeff Layton <jlayton@xxxxxxxxx>

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