Re: [Ext2-devel] Re: [NFS] htree+NFS (NFS client bug?)

From: Stephen C. Tweedie (sct@redhat.com)
Date: Thu Nov 28 2002 - 11:44:39 EST

Hi,

On Wed, Nov 27, 2002 at 08:55:54PM +0000, Stephen C. Tweedie wrote:
 
> Having said that, the server is clearly in error in sending a
> duplicate cookie in the first place, and if it did so we'd never get
> into such a state.

And it's ext3's fault. Reproducer below. Run the attached readdir
against an htree directory and you get something like:

[root@host1 htest]# ~sct/test/fs/readdir
getdents at f_pos 0000000000000000 returned 4084.
getdents at f_pos 0X0000000B753BE7 returned 4080.
getdents at f_pos 0X000000158C4C61 returned 4080.
getdents at f_pos 0X00000021E86BDC returned 4080.
getdents at f_pos 0X0000002D60F25D returned 4080.
getdents at f_pos 0X00000037BC95D7 returned 4096.
getdents at f_pos 0X000000434E2AA3 returned 4080.
getdents at f_pos 0X0000004EF11AE6 returned 4080.
getdents at f_pos 0X000000596EBC2F returned 4080.
getdents at f_pos 0X00000065A76668 returned 4080.
getdents at f_pos 0X0000007060CF8B returned 4080.
getdents at f_pos 0X0000007B9213FA returned 1464.
getdents at f_pos 0X0000007B9213FA returned 0.
Final f_pos is 0X0000007B9213FA.
[root@host1 htest]#

The problem is that the htree readdir code is not updating f_pos after
returning the very last chunk of data to the caller. That doesn't
hurt most callers because the location is cached in the filp->private
data, but it really upsets NFS.

--Stephen


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