From: Trond Myklebust <trond.myklebust@fys.uio.no>
Subject: Re: mtime not updated in client cache?
Date: Mon, 28 Nov 2005 19:45:29 -0500
Message-ID: <1133225130.12178.9.camel@lade.trondhjem.org>
References: <438B9C44.4030305@google.com>
Mime-Version: 1.0
Content-Type: text/plain
Cc: nfs@lists.sourceforge.net
To: Vince Busam <vbusam@google.com>
In-Reply-To: <438B9C44.4030305@google.com>
Sender: nfs-admin@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

On Mon, 2005-11-28 at 16:09 -0800, Vince Busam wrote:
> The following code snippet run on a 2.6.13.4 (+CITI patch) client shows that mtime doesn't 
> get updated unless fclose() is called before stat, or O_DIRECT is used.  In 2.4, the stat 
> would return an updated mtime.  Is this a bug, or expected cache behavior?

That is a known issue that should be fixed in 2.6.15-rcX

Cheers,
  Trond

> Thanks,
> Vince
> 
> #include <stdio.h>
> #include <time.h>
> #include <sys/types.h>
> #include <unistd.h>
> #include <sys/stat.h>
> 
> int main(int argc, char **argv) {
>    time_t tm;
>    struct stat statinfo;
>    FILE *fp = fopen("testfile", "w");
>    sleep(2);
>    tm = time(NULL);
>    fwrite("X", 1, 1, fp);
>    fflush(fp);
> 
>    stat("testfile", &statinfo);
> 
>    if (statinfo.st_mtime < tm) {
>      printf("Bug: write time = %u, mtime = %u\n", tm, statinfo.st_mtime);
>    }
> 
>    fclose(fp);
>    return 0;
> }
> 
> 
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