From: Stuart Anderson <anderson@ligo.caltech.edu>
Subject: NFSv4 uninitialized mtime
Date: Wed, 27 Jun 2007 16:31:14 -0700
Message-ID: <20070627233114.GA14508@ligo.caltech.edu>
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The following simple program creates files with un-initialized mtime values
on a Linux NFSv4 client mounting from a Solaris NFSv4 server--at least the
mtimes are wildly different each time the program is run. The problem is
reproducible but does not happen under any of the following circumstances:

1) Drop O_EXCL from open() call.
2) NFS mount using v3.
3) Switch NFS v4 client from Linux to Solaris.

This is on an FC4 machine with the 2.6.20.14 kernel plus Trond's recent
revalidate-the-fsid-on-the-current-dir-not-the-root-dir patch
and nfs-utils 1.0.9-16 backported from CentOS 5.

Thanks.


> cat badmtime.c 
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>


main() {
int fd;

fd = open("badtime.out", O_CREAT|O_EXCL, 0664);
close(fd);
}
> vi badmtime.c
> gcc badmtime.c -o badmtime
> ./badmtime 
> ls -l badmtime.out 
-rw-r--r--  1 anderson anderson 0 Oct  9  1979 badmtime.out
> stat badmtime.out 
  File: `badmtime.out'
  Size: 0               Blocks: 1          IO Block: 1048576 regular empty file
Device: 20h/32d Inode: 107016      Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 5026/anderson)   Gid: ( 5026/anderson)
Access: 2007-06-27 16:07:24.184162655 -0700
Modify: 1979-10-09 12:54:39.549017000 -0700
Change: 2007-06-27 16:07:24.192792428 -0700


-- 
Stuart Anderson  anderson@ligo.caltech.edu
http://www.ligo.caltech.edu/~anderson

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