From: Vince Busam <vbusam@google.com>
Subject: mtime not updated in client cache?
Date: Mon, 28 Nov 2005 16:09:40 -0800
Message-ID: <438B9C44.4030305@google.com>
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To: nfs@lists.sourceforge.net
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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?

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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