Date: Fri, 19 Nov 1999 10:30:10 -0800 (PST) From: wolf@oleane.net To: freebsd-gnats-submit@freebsd.org Subject: kern/14997: NFSv3 open O_EXCL fails to set proper "atime" Message-ID: <19991119183010.9772E14C88@hub.freebsd.org>
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>Number: 14997
>Category: kern
>Synopsis: NFSv3 open O_EXCL fails to set proper "atime"
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Fri Nov 19 10:40:00 PST 1999
>Closed-Date:
>Last-Modified:
>Originator: Christophe Wolfhugel
>Release: 3.3-RELEASE
>Organization:
France Telecom Oleane
>Environment:
FreeBSD smtp1.cluster.oleane.net 3.3-RELEASE FreeBSD 3.3-RELEASE #2: Mon Oct 11 17:51:19 GMT 1999 root@:/usr/src/sys/compile/SMTP.CLUSTER i386
>Description:
NFS server = Netapp hardware. We do create a file over NFS using
following : open("toto", O_WRONLY|O_CREAT|O_EXCL, 0644) and then
close the file. We after that switch to a Sun Solaris client which
will fail to "stat" the file. Using "snoop" it happens that the "getattr"
returns an atime value which looks like uninitialized memory :
NFS: Last access time = -1021768688.-1679294464
NFS: Modification time = 19-Nov-99 17:51:27.960000000 GMT
NFS: Attribute change time = 19-Nov-99 17:51:27.960000000 GMT
The FreeBSD client does not grok probably because it does less checks
on the atime. A tcpdump on the FreeBSD side for the same stat call
gives :
19:27:33.564961 192.168.1.201.2049 > 192.168.1.1.2051613514: reply ok 120
access attr: REG 644 ids 0/0 sz 5 nlink 1 rdev 0/0 fsid 0 nodeid 0
a/m/ctime 3273198608.1407713280 943035960.650001000 943035960.650001000
c 002d (ttl 64, id 45316)
That clearly shows that the atime value is somewhat strange. When not
using O_EXCL the problem is not there.
>How-To-Repeat:
open O_EXCL the file, close it, stat it. We have not tested with a
different NFSserver, so that can either be a FreeBSD or a Netapp issue.
>Fix:
Painful workaround : we do a "utime" on the file after the successful
file creation and before our Sun client uses it.
>Release-Note:
>Audit-Trail:
>Unformatted:
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