Re: [PATCH 2/5] ceph: stop using current_kernel_time()

[Yan, Zheng]

On Wed, Jun 20, 2018 at 11:52 PM Arnd Bergmann <arnd@xxxxxxxx> wrote:
>
> ceph_mdsc_create_request() is one of the last callers of the
> deprecated current_kernel_time() as well as timespec_trunc().
>
> This changes it to use the timespec64 based interfaces instead,
> though we still need to convert the result until we are ready to
> change over req->r_stamp.
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> ---
>  fs/ceph/mds_client.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
> index dc8bc664a871..69c839316a7a 100644
> --- a/fs/ceph/mds_client.c
> +++ b/fs/ceph/mds_client.c
> @@ -1779,6 +1779,7 @@ struct ceph_mds_request *
>  ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
>  {
>         struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
> +       struct timespec64 ts;
>
>         if (!req)
>                 return ERR_PTR(-ENOMEM);
> @@ -1797,7 +1798,9 @@ ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
>         init_completion(&req->r_safe_completion);
>         INIT_LIST_HEAD(&req->r_unsafe_item);
>
> -       req->r_stamp = timespec_trunc(current_kernel_time(), mdsc->fsc->sb->s_time_gran);
> +       ktime_get_coarse_real_ts64(&ts);
> +       req->r_stamp = timespec64_to_timespec(timespec64_trunc(ts,
> +                                               mdsc->fsc->sb->s_time_gran));
>

does current_time() internally uses ktime_get_coarse_real_ts64()?  If
not,  granularity difference may cause problem. see commit
56199016e8672feb7b903eda003a863d5bf2b8c4 for more information

Regards
Yan, Zheng

>         req->r_op = op;
>         req->r_direct_mode = mode;
> --
> 2.9.0
>
> --
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