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Re: wrong atime created by NFS clients (Mac OX 10.5 and 10.6).
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Re: wrong atime created by NFS clients (Mac OX 10.5 and 10.6).


  • Subject: Re: wrong atime created by NFS clients (Mac OX 10.5 and 10.6).
  • From: 林 智子 <email@hidden>
  • Date: Mon, 27 Sep 2010 10:21:40 +0900

This is additional informations.

We use iMac with NFS mounted home directory from EMC file server.
The NFS is version 3.

Acctual operations are as follows.
----------------------------------------------------------------
% whoami
emc09
% cd ~
% pwd
/Network/Servers/emcfsv01/vol/vol1/home/emc09
% cat wrong_atime.c
#include <stdlib.h>
#include <string.h>
#include <stddef.h>

main() {

int fd;

 /* O_EXCL option will cause wrong atime */
 fd = open("AIZU", O_CREAT | O_EXCL | O_RDWR, 0644);
 close(fd);
 exit(0);
}
% cc wrong_atime.c
% ./a.out
% ls -lu AIZU
-rw-r--r--  1 emc09  student  0 Nov  9  1920
----------------------------------------------------------------

Thanks in advance.


On Mon, 27 Sep 2010 08:38:34 +0900
林 智子 <email@hidden> wrote:

> We have iMac computers in classrooms, and they are running as an NFS client.
> We have found that the wrong access time (atime) is created by Mac OS 10.5
> and 10.6.
>
> A file that is opened by using "O_CREAT|O_EXCL" on the NFS-mounted directory
> will have the wrong atime. For example, the year will appear as 1920 or 2037
> depending on the IP address of the NFS client.
>
> This problem can also be found with Solaris NFS server and EMC Celerra.
>
> The following program will create a file having the wrong atime on an
> NFS-mounted directory:
>
> -------------------
> #include <fcntl.h>
> #include <stdlib.h>
> #include <string.h>
> #include <stddef.h>
>
> main() {
>
> int fd;
>
> /* O_EXCL option will cause wrong atime */
> fd = open("AIZU", O_CREAT | O_EXCL | O_RDWR, 0644);
> close(fd);
> exit(0);
> }
> -------------------
>
> The phenomenon is quite similar to the following problems on FreeBSD reported in 2001:
> http://www.mail-archive.com/email@hidden/msg22084.html
>
> If anyone knows a solution to this problem, we would greatly appreciate your advice. Thanks in advance.
>
> ----
> Tomoko Hayashi
> The University og Aizu
> email@hidden
>  _______________________________________________
> Do not post admin requests to the list. They will be ignored.
> Filesystem-dev mailing list      (email@hidden)
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>
> This email sent to email@hidden
>


----
Tomoko Hayashi
The University og Aizu
email@hidden
 _______________________________________________
Do not post admin requests to the list. They will be ignored.
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 >wrong atime created by NFS clients (Mac OX 10.5 and 10.6). (From: 林 智子 <email@hidden>)

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