gmane.linux.nfs

Re: [PATCH v2 2/4] SUNRPC: fix races on PipeFS MOUNT notifications

Stanislav Kinsbursky — 2013-06-18T06:41:26

17.06.2013 22:20, Myklebust, Trond пишет:

Hello, Trond.
Sure, will do.

Problems in idmapd.conf.5

2013-06-18T05:13:56

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Problems with idmapd.conf.5:

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Re: [PATCH]: gssd: Fix preferred_realm option handling

Maximilian Wilhelm — 2013-06-17T17:02:47

Anno domini 2013 Jim Rees scripsit:




Indeed. The first '(' should have been a ','.

Anyone willing to apply this?

Thanks
Max

Re: [PATCH v3 07/13] locks: avoid taking global lock if possible when waking up blocked waiters

Jeff Layton — 2013-06-17T15:55:08

On Mon, 17 Jun 2013 11:13:50 -0400
Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA< at >public.gmane.org> wrote:



Ok, potential race here. We hold the i_lock when we check list_empty()
above, but it's possible for the fl_block list to become empty between
that check and when we take the spinlock below. locks_delete_block does
not require that you hold the i_lock, and some callers don't hold it.

This is trivially fixable by just keeping this as a while() loop. We'll
do the list_empty() check twice in that case, but that shouldn't change
the performance here much.

I'll fix that in my tree and it'll be in the next resend. Sorry for the
noise...

Re: [PATCH v3 06/13] locks: protect most of the file_lock handling with i_lock

Jeff Layton — 2013-06-17T15:46:09

On Mon, 17 Jun 2013 11:13:49 -0400
Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA< at >public.gmane.org> wrote:


[...]


Doh -- bug here. This should not have been changed to
locks_delete_block(). My apologies.


[...]



Ditto here...

Re: Can't mount NFSv4 with kerberos on Debian Wheezy

Chuck Lever — 2013-06-17T15:30:54

On Jun 17, 2013, at 10:58 AM, John Haiducek <jhaiduce-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org> wrote:


It looks to me like a network connectivity issue at this point.  The next step is to capture a network trace.

--
Chuck Lever
chuck[dot]lever[at]oracle[dot]com



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Re: Can't mount NFSv4 with kerberos on Debian Wheezy

John Haiducek — 2013-06-17T14:58:06

On 06/14/2013 02:13 PM, Chuck Lever wrote:

Incidentally, I have a dual-stack network (ipv4 and ipv6). My best guess 
is that ipv6 is not part of the problem; the client and server had 
missing AAAA records in DNS; when I added those the NFS mount switched 
automatically to using ipv6 for the connection but it hangs the same as 
before.

John

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Re: why does nfsd write not use splice

J. Bruce Fields — 2013-06-17T14:48:07

Right, so you get to rewrite the xdr code so that it can process at
least some part of the compound as it comes in.  Fun!

That's why I say it could take a lot of work even to get a prototype
sufficient to measure the effect of splice.  Though maybe you could find
some simple heuristic that would predict the offset of write data when
using your particular test setup....

--b.
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Re: Can't mount NFSv4 with kerberos on Debian Wheezy

John Haiducek — 2013-06-17T14:42:46

On 06/17/2013 08:23 AM, Chuck Lever wrote:

Yes, and with the same verbosity as rpc.gssd (-vvv).

John

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RE: why does nfsd write not use splice

Myklebust, Trond — 2013-06-17T14:36:20

Not if you need to copy in order to realign the data anyway...

Cheers
  Trond

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Re: why does nfsd write not use splice

J. Bruce Fields — 2013-06-17T14:34:26

Well, worst case you could turn it off in krb5i/krb5p cases and maybe
still get some benefit in the auth_sys case?

I suspect it will be a fair amount of work just to get enough of a
prototype up that you can start to measure the benefit (if any).  So
this isn't going to happen without someone pretty committed to the idea.

(And such a person would be better off starting by describing the actual
probem they're trying to solve before jumping to the conclusion that
splice is the solution.)

--b.
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Re: Can't mount NFSv4 with kerberos on Debian Wheezy

Chuck Lever — 2013-06-17T14:23:10

On Jun 15, 2013, at 12:38 PM, John Haiducek <jhaiduce-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org> wrote:


Is rpc.svcgssd running?

--
Chuck Lever
chuck[dot]lever[at]oracle[dot]com



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Re: why does nfsd write not use splice

Myklebust, Trond — 2013-06-17T11:48:18

On Jun 17, 2013, at 7:01 AM, Jeff Layton <jlayton-H+wXaHxf7aLQT0dZR+AlfA< at >public.gmane.org>
 wrote:


Once you've copied the data one time, most of the advantage of splice() is gone, since a copy will then exist in processor cache memory and can be duplicated quickly.

Cheers
  Trond

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Re: why does nfsd write not use splice

Jeff Layton — 2013-06-17T11:01:15

On Sat, 15 Jun 2013 05:09:55 +0000
"Myklebust, Trond" <Trond.Myklebust-HgOvQuBEEgTQT0dZR+AlfA< at >public.gmane.org> wrote:


Encryption certainly can be a problem, but integrity isn't necessarily
one.

Basically the idea would be to receive the data off the socket into a
set of pages and then splice those into the correct spot in the local
file. In both the privacy and integrity cases, you just have an extra
step in between. Privacy *may* mean an extra copy too (though some of
the crypto routines can decrypt data in place), but handling integrity
shouldn't.

The tricky parts (I think) are determining how to lay out the received
data into the pages you eventually want to splice into the file before
you receive that data in, and how to deal with it when the WRITE
doesn't cover an entire page.

Re: Can't mount NFSv4 with kerberos on Debian Wheezy

John Haiducek — 2013-06-15T16:38:42

Ok, now in /var/log messages I have this:

Jun 15 09:13:21 tbm kernel: [307264.414216] NFSD: starting 90-second 
grace period
Jun 15 09:23:34 tbm kernel: [307877.856060] nfs: server 
tbm.enterprise.local not responding, still trying
Jun 15 09:29:35 tbm kernel: [308238.304057] nfs: server 
tbm.enterprise.local not responding, still trying
Jun 15 10:33:27 tbm kernel: [312070.654766] NFS: nfs mount 
opts='addr=192.168.1.7,clientaddr=192.168.1.7'
Jun 15 10:33:27 tbm kernel: [312070.654780] NFS:   parsing nfs mount 
option 'addr=192.168.1.7'
Jun 15 10:33:27 tbm kernel: [312070.654795] NFS:   parsing nfs mount 
option 'clientaddr=192.168.1.7'
Jun 15 10:33:27 tbm kernel: [312070.654807] NFS: MNTPATH: '/export/nfstest'
Jun 15 10:33:27 tbm kernel: [312070.654810] --> nfs4_try_mount()
Jun 15 10:33:27 tbm kernel: [312070.654822] --> nfs4_create_server()
Jun 15 10:33:27 tbm kernel: [312070.654854] --> nfs4_init_server()
Jun 15 10:33:27 tbm kernel: [312070.654857] --> nfs4_set_client()
Jun 15 10:33:27 tbm kernel: [31207

Re: Can't mount NFSv4 with kerberos on Debian Wheezy

Chuck Lever — 2013-06-15T16:31:53

On Jun 15, 2013, at 12:28 PM, John Haiducek <jhaiduce-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org> wrote:


On the client,

  "sudo rpcdebug -m nfs -s all"

And try the mount.  Look in /var/log/messages for output.

Did you tell us what kernel release you are running on client and server?  "uname -a"

Re: Can't mount NFSv4 with kerberos on Debian Wheezy

John Haiducek — 2013-06-15T16:28:20

Already have it gssd running with -vvv.
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Re: Can't mount NFSv4 with kerberos on Debian Wheezy

Chuck Lever — 2013-06-15T16:27:23

On Jun 15, 2013, at 11:24 AM, John Haiducek <jhaiduce-Re5JQEeQqe8AvxtiuMwx3w< at >public.gmane.org> wrote:


You can boost the verbosity of the debugging messages from gssd.  Start it with "-vv" or "-vvv".

Re: Can't mount NFSv4 with kerberos on Debian Wheezy

John Haiducek — 2013-06-15T15:24:48

Ok, I think I fixed the DNS problem. I was running avahi, and apparently 
you can't use avahi and also have a DNS server with a domain ending in 
.local. Shutting down avahi fixed it, although if I wanted to keep avahi 
working I could probably fix this by changing my domain to end in 
something other than .local.

But now the mount command hangs and never returns. I get this in 
/var/log/syslog:

Jun 15 09:19:36 tbm rpc.idmapd[16253]: New client: 24
Jun 15 09:19:36 tbm rpc.gssd[16258]: dir_notify_handler: sig 37 si 
0x7fffb0fb3330 data 0x7fffb0fb3200
Jun 15 09:19:37 tbm rpc.gssd[16258]: dir_notify_handler: sig 37 si 
0x7fffb0fb3330 data 0x7fffb0fb3200
Jun 15 09:19:37 tbm rpc.gssd[16258]: dir_notify_handler: sig 37 si 
0x7fffb0fb3330 data 0x7fffb0fb3200
Jun 15 09:19:37 tbm rpc.gssd[16258]: destroying client 
/var/lib/nfs/rpc_pipefs/nfs/clnt24
Jun 15 09:19:37 tbm rpc.idmapd[16253]: Stale client: 24
Jun 15 09:19:37 tbm rpc.idmapd[16253]: #011-> closed 
/var/lib/nfs/rpc_pipefs/nfs/clnt24/idmap
Jun 15 09:19:53

RE: why does nfsd write not use splice

Myklebust, Trond — 2013-06-15T05:09:55

Finally, there is the minor problem that the data that is actually received by the socket may be encrypted, or may need to be checksummed (krb5i) _before_ you can apply it to the file. That is not a particularly good fit for splice().

Trond
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