> On Feb 4, 2016, at 05:27, Arnd Bergmann <arnd@xxxxxxxx> wrote:
>
> On Wednesday 03 February 2016 08:17:23 Deepa Dinamani wrote:
>> On Wed, Feb 03, 2016 at 10:34:00PM +0800, Yan, Zheng wrote:
>>> On Wed, Feb 3, 2016 at 2:07 PM, Deepa Dinamani <deepa.kernel@xxxxxxxxx> wrote:
>>>> --- a/fs/ceph/mds_client.c
>>>> +++ b/fs/ceph/mds_client.c
>>>> @@ -1721,7 +1721,7 @@ 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 = CURRENT_TIME;
>>>> + ktime_get_real_ts(&req->r_stamp);
>>>
>>> I think we should use current_fs_time() here. I have squash the change
>>> into another patch
>>
>> Ok. I missed this commit b8e69066d8afa8d2670dc697252ff0e5907aafad
>> earlier which says that the r_stamp is used as ctime now.
>> I had assumed that this is a message timestamp.
>>
>> I was not able to find any documentation on what the server does
>> with the message sent by the client. Where can I find that?
>>
>> So, this should actually look like
>>
>> req->r_stamp = current_fs_time(mdsc->fsc->sb);
>>
>> Let me know if you want me to resend.
I have already squashed the change into patch 8
>
> I see that the timestamp is sent using
>
> ceph_encode_copy(&p, &req->r_stamp, sizeof(req->r_stamp));
this code is outdated, current code is:
{
struct ceph_timespec ts;
ceph_encode_timespec(&ts, &req->r_stamp);
ceph_encode_copy(&p, &ts, sizeof(ts));
}
>
> What happens with the timestamp across reboots if we change the
> type? I assume the data will not be used across reboots, if it
> does, we already have a problem on machines that can boot
> both big-endian and little-endian kernels, or that can boot
> both 32-bit and 64-bit kernels.
>
> Arnd
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