Messages in this thread | | | From | Chuck Lever <> | Subject | Re: mount.nfs: access denied by server | Date | Fri, 21 Aug 2009 13:50:52 -0400 |
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On Aug 20, 2009, at 10:36 PM, Trond Myklebust wrote:
> On Fri, 2009-08-21 at 09:27 +0800, Wu Fengguang wrote: >> On Thu, Aug 20, 2009 at 09:02:29PM +0800, Trond Myklebust wrote: >>> On Thu, 2009-08-20 at 15:13 +0800, Wu Fengguang wrote: >>>> Hi, >>>> >>>> After upgrading NFS client kernel to latest linux-next, NFS mount >>>> failed: >>>> >>>> # mount -t nfs pxe:/cc /cc >>>> mount.nfs: access denied by server while mounting pxe:/cc >>>> >>>> # uname -a >>>> Linux hp 2.6.31-rc6-next-20090818 #61 SMP Thu Aug 20 >>>> 14:46:10 CST 2009 x86_64 GNU/Linux >>>> >>>> However server log says OK: >>>> >>>> Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated mount >>>> request from 192.168.11.6:973 for /cc (/cc) >>>> Aug 20 15:02:09 wu-t61 mountd[4599]: authenticated unmount >>>> request from 192.168.11.6:974 for /cc (/cc) >>>> >>>> However-2: nfsroot can be mounted at boot time. Server kernel has >>>> always been 2.6.30. >>>> >>>> Any ideas? >>>> >>>> Thanks, >>>> Fengguang >>> >>> Can you try again after enabling mount debugging on the NFS client? >>> >>> echo 512 > /proc/sys/sunrpc/nfs_debug >> >> I used 1024 and found the mount failed here in nfs_walk_authlist(): >> >> dfprintk(MOUNT, "NFS: server does not support requested auth >> flavor\ n"); >> nfs_umount(request); > > Thanks Fengguang! > > Chuck, this looks like one of yours. Could it be that you are hitting > the same Linux knfsd bug that Tom Haynes saw with a Solaris client? > AFAICR, the problem was that existing nfs servers do not set a default > auth flavour, and so you just have to try with auth_sys and see if it > succeeds...
With 1024 set, the mount client's XDR routines should have listed the server's flavors, if any, in the system log. Should be something like "NFS: received 0 auth flavors" if the server didn't return any. Can you confirm that?
I'll try to post a fix later today.
-- Chuck Lever chuck[dot]lever[at]oracle[dot]com
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