atimes not updated over NFS

[Andre Majorel <aym-xunil@teaser.fr>]

After upgrading an NFS server from kernel 2.6.12 to 2.6.23, the
atime of files is not updated any more when clients read them :

  client$ ll -u --time-style +%Y-%m-%d_%H:%M:%S /nfsmnt/zz
  -rw-r--r-- 1 xxx xxx 0 2007-12-21_14:58:11 /nfsmnt/zz
  client$ md5sum /nfsmnt/zz
  d41d8cd98f00b204e9800998ecf8427e  /nfsmnt/zz
  client$ date +%Y-%m-%d_%H:%M:%S
  2007-12-21_15:00:28
  client$ ll -u --time-style +%Y-%m-%d_%H:%M:%S /nfsmnt/zz
  -rw-r--r-- 1 xxx xxx 0 2007-12-21_14:58:11 /nfsmnt/zz

Reading the file locally, i.e. on the NFS server, does update the
atime :

  server$ ll -u --time-style +%Y-%m-%d_%H:%M:%S /nfsmnt/zz
  -rw-r--r-- 1 xxx xxx 0 2007-12-21_14:58:11 /nfsmnt/zz
  serveur$ md5sum /nfsmnt/zz
  d41d8cd98f00b204e9800998ecf8427e  /nfsmnt/zz
  serveur$ date +%Y-%m-%d_%H:%M:%S
  2007-12-21_15:04:00
  serveur$ ll -u --time-style +%Y-%m-%d_%H:%M:%S /nfsmnt/zz
  -rw-r--r-- 1 xxx xxx 0 2007-12-21_15:03:57 /nfsmnt/zz

/nfsmnt is mounted with options :
- server : rw,noexec,nosuid,nodev,nodiratime
- client : rw,user=root,nosuid,nodev,nodiratime,intr,rsize=8192,wsize=8192

Any ideas ?

-- 
André Majorel <URL:http://www.teaser.fr/~amajorel/>
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