[SMB3][PATCH] Speed up open by skipping query FILE_INTERNAL_INFORMATION

[Steve French]

Also fyi - did some experiments today.  Perf across the open vfs entry
point averaged about 20% better with the patch

On Thu, Jul 18, 2019 at 12:37 PM Pavel Shilovsky
<pavel.shilovsky at gmail.com> wrote:
>
> index 54bffb2a1786..e6a1fc72018f 100644
> --- a/fs/cifs/smb2file.c
> +++ b/fs/cifs/smb2file.c
> @@ -88,14 +88,20 @@ smb2_open_file(const unsigned int xid, struct
> cifs_open_parms *oparms,
>   }
>
>   if (buf) {
> - /* open response does not have IndexNumber field - get it */
> - rc = SMB2_get_srv_num(xid, oparms->tcon, fid->persistent_fid,
> + /* if open response does not have IndexNumber field - get it */
> + if (smb2_data->IndexNumber == 0) {
>
> What's about a server returning 0 for the IndexNumber?
>
> - if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
> - *oplock = smb2_parse_lease_state(server, rsp,
> - &oparms->fid->epoch,
> - oparms->fid->lease_key);
> - else
> +
> + *oplock = smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
> +       oparms->fid->lease_key,
> +       buf);
> + if (*oplock == 0) /* no lease open context found */
>   *oplock = rsp->OplockLevel;
>
> oplock being 0 here probably means that the lease state which is
> granted is NONE. You still need to keep if (rsp->OplockLevel ==
> SMB2_OPLOCK_LEVEL_LEASE) gate.
>
>  /* See MS-SMB2 2.2.14.2.9 */
>  struct on_disk_id {
>
> Please prefix the structure name with "create_".
>
> Best regards,
> Pavel Shilovskiy
>
> чт, 18 июл. 2019 г. в 00:43, Steve French via samba-technical
> <samba-technical at lists.samba.org>:
> >
> > Now that we have the qfid context returned on open we can cut 1/3 of
> > the traffic on open by not sending the query FILE_INTERNAL_INFORMATION
> >
> >
> >
> > --
> > Thanks,
> >
> > Steve



-- 
Thanks,

Steve