From: Anna Schumaker <Anna.Schumaker@netapp.com>
To: Deepa Dinamani <deepa.kernel@gmail.com>,
Trond Myklebust <trondmy@primarydata.com>
Cc: "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
Thomas Gleixner <tglx@linutronix.de>,
Al Viro <viro@zeniv.linux.org.uk>,
Linus Torvalds <torvalds@linux-foundation.org>,
"y2038@lists.linaro.org" <y2038@lists.linaro.org>,
"linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>
Subject: Re: [PATCH 18/21] fs: nfs: Make nfs boot time y2038 safe
Date: Fri, 10 Jun 2016 09:12:55 -0400
Message-ID: <d135d52c-be6d-8d89-a619-03210774ec42@Netapp.com> (raw)
In-Reply-To: <CABeXuvoLr7amTYBs5AbMv15Vqx2CQib9F8Qr4GzX9RoZZ9ZnpQ@mail.gmail.com>
On 06/09/2016 05:10 PM, Deepa Dinamani wrote:
>>> boot_time is represented as a struct timespec.
>>> struct timespec and CURRENT_TIME are not y2038 safe.
>>> Overall, the plan is to use timespec64 for all internal
>>> kernel representation of timestamps.
>>> CURRENT_TIME will also be removed.
>>> Use struct timespec64 to represent boot_time.
>>> And, ktime_get_real_ts64() for the boot_time value.
>>>
>>> boot_time is used to construct the nfs client boot verifier.
>>> This will now wrap in 2106 instead of 2038 on 32-bit systems.
>>> The server only relies on the value being persistent until
>>> reboot so the wrapping should be fine.
>>
>> We really do not give a damn about wraparound here, since the boot time is
>> only ever compared for an exact match, and the odds of two reboots occurring
>> exactly 2^32 * 10^9 nanoseconds apart are cosmically small...
>> If struct timespec is going away, can we just convert this into a ktime_t?
>
> timespec64 is the same as timespec already on 64 bit machines.
> But, yes, we can use ktime_t here.
>
> Did you mean the internal storage value or the wire boo_time used for verifier?
> In case you don't want to change the wire value, then we will have a division
> operation, every time the verifier needs to be sent.
The verifier is mostly used during mounting, so we don't send too many of them. I don't think we need to worry about adding an extra division operation here, they're pretty cheap compared to making RPC calls! :)
Anna
>
> -Deepa
>
> -Deepa
>
next prev parent reply index
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-09 5:04 [PATCH 00/21] Delete CURRENT_TIME and CURRENT_TIME_SEC macros Deepa Dinamani
2016-06-09 5:04 ` [PATCH 01/21] fs: Replace CURRENT_TIME_SEC with current_fs_time() Deepa Dinamani
2016-06-09 7:35 ` Jan Kara
2016-06-09 19:15 ` Linus Torvalds
2016-06-09 20:41 ` Deepa Dinamani
2016-06-09 12:31 ` Bob Copeland
2016-06-10 22:21 ` Arnd Bergmann
2016-06-11 5:03 ` Deepa Dinamani
2016-06-11 20:55 ` Arnd Bergmann
2016-06-09 5:04 ` [PATCH 02/21] fs: ext4: Use current_fs_time() for inode timestamps Deepa Dinamani
2016-06-09 18:45 ` Linus Torvalds
2016-06-09 18:55 ` Linus Torvalds
2016-06-10 22:19 ` [Y2038] " Arnd Bergmann
2016-06-14 17:55 ` Deepa Dinamani
2016-06-14 20:59 ` Arnd Bergmann
2016-06-09 5:04 ` [PATCH 03/21] fs: ubifs: " Deepa Dinamani
2016-06-09 5:04 ` [PATCH 05/21] fs: jfs: Replace CURRENT_TIME_SEC by current_fs_time() Deepa Dinamani
2016-06-09 5:04 ` [PATCH 06/21] fs: udf: Replace CURRENT_TIME with current_fs_time() Deepa Dinamani
2016-06-09 7:41 ` Jan Kara
2016-06-10 0:53 ` Deepa Dinamani
2016-06-09 5:04 ` [PATCH 07/21] fs: cifs: Replace CURRENT_TIME by current_fs_time() Deepa Dinamani
2016-06-09 5:04 ` [PATCH 08/21] fs: cifs: Replace CURRENT_TIME with ktime_get_real_ts() Deepa Dinamani
2016-06-09 5:04 ` [PATCH 09/21] fs: cifs: Replace CURRENT_TIME by get_seconds Deepa Dinamani
2016-06-09 5:04 ` [PATCH 10/21] fs: f2fs: Use ktime_get_real_seconds for sit_info times Deepa Dinamani
2016-06-09 5:04 ` [PATCH 11/21] drivers: staging: lustre: Replace CURRENT_TIME with current_fs_time() Deepa Dinamani
2016-06-11 0:36 ` [lustre-devel] " James Simmons
2016-06-11 1:53 ` Andreas Dilger
2016-06-09 5:04 ` [PATCH 12/21] block: rbd: Replace non inode " Deepa Dinamani
2016-06-09 5:04 ` [PATCH 13/21] fs: ocfs2: Use time64_t to represent orphan scan times Deepa Dinamani
2016-06-09 5:04 ` [PATCH 14/21] fs: ocfs2: Replace CURRENT_TIME with ktime_get_real_seconds() Deepa Dinamani
2016-06-09 5:04 ` [PATCH 15/21] time: Add time64_to_tm() Deepa Dinamani
2016-06-14 21:18 ` John Stultz
2016-06-15 17:44 ` Deepa Dinamani
2016-06-17 20:52 ` John Stultz
2016-06-17 20:59 ` Deepa Dinamani
2016-06-17 21:06 ` Arnd Bergmann
2016-06-09 5:05 ` [PATCH 16/21] fnic: Use time64_t to represent trace timestamps Deepa Dinamani
2016-06-09 5:05 ` [PATCH 17/21] audit: Use timespec64 to represent audit timestamps Deepa Dinamani
2016-06-09 14:31 ` Steve Grubb
2016-06-09 23:59 ` Richard Guy Briggs
2016-06-10 0:19 ` Steve Grubb
2016-06-10 1:44 ` Richard Guy Briggs
2016-06-15 21:23 ` Paul Moore
2016-06-10 0:45 ` Deepa Dinamani
2016-06-09 5:05 ` [PATCH 18/21] fs: nfs: Make nfs boot time y2038 safe Deepa Dinamani
2016-06-09 19:23 ` Trond Myklebust
2016-06-09 21:10 ` Deepa Dinamani
2016-06-10 13:12 ` Anna Schumaker [this message]
2016-06-10 14:02 ` Trond Myklebust
2016-06-09 5:05 ` [PATCH 19/21] libceph: Remove CURRENT_TIME references Deepa Dinamani
2016-06-09 5:05 ` [PATCH 20/21] libceph: Replace CURRENT_TIME with ktime_get_real_ts Deepa Dinamani
2016-06-09 5:05 ` [PATCH 21/21] time: Delete CURRENT_TIME_SEC and CURRENT_TIME macro Deepa Dinamani
2016-06-14 21:20 ` John Stultz
2016-06-09 7:51 ` [PATCH 00/21] Delete CURRENT_TIME and CURRENT_TIME_SEC macros Felipe Balbi
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