mtime not updated in client cache?

[Vince Busam <vbusam@google.com>]

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;
}


-------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc. Do you grep through log files
for problems?  Stop!  Download the new AJAX search engine that makes
searching your log files as easy as surfing the  web.  DOWNLOAD SPLUNK!
http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click
_______________________________________________
NFS maillist  -  NFS@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nfs