Date: Thu, 28 Jun 2012 20:14:52 +0100 From: Vincent Hoffman <vince@unsane.co.uk> To: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: Re: Occassional "permission denied" in the middle of a large transfer over NFS Message-ID: <4FECAD2C.8070402@unsane.co.uk> In-Reply-To: <4FEB2664.6000300@unsane.co.uk> References: <4FE62269.2030706@unsane.co.uk> <4FEB2664.6000300@unsane.co.uk>
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Just a note to say I have tested this on -CURRENT with the new nfs server and it is still the case. On the client (FreeBSD seaurchin 8.3-RELEASE-p3 FreeBSD 8.3-RELEASE-p3 #0: Tue Jun 12 00:39:29 UTC 2012 root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64) [root@seaurchin /mnt/nfs/vm]# date ; tar -cf foo.tar /var/nfsen/profiles-data/ ; date Thu Jun 28 20:12:36 BST 2012 tar: Removing leading '/' from member names tar: Write error Thu Jun 28 20:12:38 BST 2012 [root@seaurchin /mnt/nfs/vm]# on the Server [root@fbsd /var/tmp]# uname -a ; date ; while true ; do mount /dev/md0 /mnt/tmp/ ; umount /mnt/tmp ; done FreeBSD fbsd 10.0-CURRENT FreeBSD 10.0-CURRENT #22 r237646: Wed Jun 27 19:13:26 BST 2012 toor@fbsd.bmk.namesco.net:/usr/obj/usr/src/sys/unsane-vm amd64 Thu Jun 28 20:12:38 BST 2012 ^C [root@fbsd /var/tmp]# any suggestions welcome. Vince On 27/06/2012 16:27, Vincent Hoffman wrote: > Hi, > After only one off-list reply from the author of kern/136865 (see below) > after asking -questions, I thought it worth asking -CURRENT. > Basically: > > I seem to have run into the problems described in this old thread. > http://lists.freebsd.org/pipermail/freebsd-questions/2004-April/044927.html > > tl:dr mountd may give incorrect permission denied errors when it is > refreshing the exports list due to non-atomic operations, /sbin/mount has code that sends SIGHUP to > mountd on any mount operation, which implies that any manual mount > request would cause the problem. > > Currently I have still only tested on 8.3-RELEASE but the svn log doesnt > seem to mention a fix since then. I'm currently taking a VM up to > -CURRENT to test. > > Looking though old PRs I see the following related. > kern/131342 > kern/136865 (with patch for 7.2 and links to > http://nfse.sourceforge.net/ for -CURRENT ) > > Does anyone who is qualified (sadly not me) feel like looking at the > code to see if its suitable for inclusion in part/whole as not having > NFS transfers interrupted by local mount operations on the nfs server > would be very handy :) > > > thanks, Vince > > > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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