[linux-cifs-client] Re: new regression from cifs open on lookup patches

[Shirish Pargaonkar]

On Fri, May 22, 2009 at 6:48 AM, Jeff Layton <jlayton at redhat.com> wrote:
> I've run across a new regression due to the open on lookup patches when
> working against a server with functioning posix open calls. Prior to
> those patches, opening a directory would simply result in a
> revalidation of the dir, at most this would mean a QPathInfo call would
> go out on the wire.
>
> Since the introduction of these patches, opening a directory causes an
> actual open call to go out on the wire for the directory. In general,
> the server will then return a status of NT_STATUS_FILE_IS_A_DIRECTORY
> that gets translated to -EACCES.
>
> The main place I've noticed this is when trying recursively remove a
> directory (rm -rf). rm will openat(AT_FDCWD, ...) the dir, and then try
> to walk the subdirectories. That fails. Backing out the open intent
> patches fixes the problem.
>
> This will definitely need to be fixed before 2.6.30 is released, as I'm
> certain this will break more than "rm". Attaching a testcase that can
> be used to test this.
>
> --
> Jeff Layton <jlayton at redhat.com>
>

Jeff,

Looking into this, but as I see, with this check in cifs_lookup
 !(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY))
posix open will not work on a directory, only on a file.