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nfsd41: Deny new lock before RECLAIM_COMPLETE done

Message ID 4DC902B9.5060103@cn.fujitsu.com (mailing list archive)
State New, archived
Headers show

Commit Message

Mi Jinlong May 10, 2011, 9:17 a.m. UTC
Hi Bruce,

 Sorry for so late to reply you.

J. Bruce Fields:
> On Wed, Apr 27, 2011 at 09:12:00AM +0800, Mi Jinlong wrote:
>> Before nfs41 client's RECLAIM_COMPLETE done, nfs server should 
>> deny it's new lock.
>> Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
> Is nfserr_grace the right error?  (Honest question, I haven't looked it
> up.)

  Yes, rfc5661 says:

  " Whenever a client establishes a new client ID and before it does the
    first non-reclaim operation that obtains a lock, it MUST send a
    RECLAIM_COMPLETE with rca_one_fs set to FALSE, even if there are no
    locks to reclaim.  If non-reclaim locking operations are done before
    the RECLAIM_COMPLETE, an NFS4ERR_GRACE error will be returned. "
> Also I'd think this check should go in nfsd4_open: opens are also
> prohibited before RECLAIM_COMPLETE, and if we check there then we don't
> need to check here, as you have to have open state before you can do a
> lock.

  Agree with you, what about the following one??
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From 3b7b82cd41823a52b77fd2c4419ab635f6e5893b Mon Sep 17 00:00:00 2001
From: Mi Jinlong <mijinlong@cn.fujitsu.com>
Date: Tue, 10 May 2011 14:07:44 +0800
Subject: [PATCH] nfsd41: Deny new lock before RECLAIM_COMPLETE done

Before nfs41 client's RECLAIM_COMPLETE done, nfs server should 
deny any new locks or opens.

Signed-off-by: Mi Jinlong <mijinlong@cn.fujitsu.com>
 fs/nfsd/nfs4proc.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 5fcb139..d71dd4d 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -291,6 +291,15 @@  nfsd4_open(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
 	if (open->op_create && open->op_claim_type != NFS4_OPEN_CLAIM_NULL)
 		return nfserr_inval;
+	/*
+	 * RFC5661 18.51.3
+	 * Before RECLAIM_COMPLETE done, server should deny new lock
+ 	 */
+	if (nfsd4_has_session(cstate) &&
+	    !cstate->session->se_client->cl_firststate &&
+	    open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
+		return nfserr_grace;
 	if (nfsd4_has_session(cstate))
 		copy_clientid(&open->op_clientid, cstate->session);