Return-Path: Received: from mx2.netapp.com ([216.240.18.37]:30726 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755816Ab0JOGRk (ORCPT ); Fri, 15 Oct 2010 02:17:40 -0400 From: Fred Isaman To: linux-nfs@vger.kernel.org Cc: Trond Myklebust Subject: [PATCH 04/12] RFC: nfs: change stateid to be a union Date: Sun, 10 Oct 2010 11:22:45 -0400 Message-Id: <1286724173-8493-5-git-send-email-iisaman@netapp.com> In-Reply-To: <1286724173-8493-1-git-send-email-iisaman@netapp.com> References: <1286724173-8493-1-git-send-email-iisaman@netapp.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Content-Type: text/plain MIME-Version: 1.0 From: Alexandros Batsakis In NFSv4.1 the stateid consists of the other and seqid fields. For layout processing we need to numerically compare the seqid value of layout stateids. To do so, introduce a union to nfs4_stateid to switch between opaque(16 bytes) and opaque(12 bytes) / __be32 Signed-off-by: Alexandros Batsakis Signed-off-by: Benny Halevy Signed-off-by: Fred Isaman --- fs/nfs/callback_proc.c | 8 ++++---- include/linux/nfs4.h | 15 +++++++++++++-- 2 files changed, 17 insertions(+), 6 deletions(-) diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c index 930d10f..2950fca 100644 --- a/fs/nfs/callback_proc.c +++ b/fs/nfs/callback_proc.c @@ -118,11 +118,11 @@ int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const n if (delegation == NULL) return 0; - /* seqid is 4-bytes long */ - if (((u32 *) &stateid->data)[0] != 0) + if (stateid->stateid.seqid != 0) return 0; - if (memcmp(&delegation->stateid.data[4], &stateid->data[4], - sizeof(stateid->data)-4)) + if (memcmp(&delegation->stateid.stateid.other, + &stateid->stateid.other, + NFS4_STATEID_OTHER_SIZE)) return 0; return 1; diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h index 6c0406e..34da324 100644 --- a/include/linux/nfs4.h +++ b/include/linux/nfs4.h @@ -17,7 +17,9 @@ #define NFS4_BITMAP_SIZE 2 #define NFS4_VERIFIER_SIZE 8 -#define NFS4_STATEID_SIZE 16 +#define NFS4_STATEID_SEQID_SIZE 4 +#define NFS4_STATEID_OTHER_SIZE 12 +#define NFS4_STATEID_SIZE (NFS4_STATEID_SEQID_SIZE + NFS4_STATEID_OTHER_SIZE) #define NFS4_FHSIZE 128 #define NFS4_MAXPATHLEN PATH_MAX #define NFS4_MAXNAMLEN NAME_MAX @@ -167,7 +169,16 @@ struct nfs4_acl { }; typedef struct { char data[NFS4_VERIFIER_SIZE]; } nfs4_verifier; -typedef struct { char data[NFS4_STATEID_SIZE]; } nfs4_stateid; + +struct nfs41_stateid { + __be32 seqid; + char other[NFS4_STATEID_OTHER_SIZE]; +} __attribute__ ((packed)); + +typedef union { + char data[NFS4_STATEID_SIZE]; + struct nfs41_stateid stateid; +} nfs4_stateid; enum nfs_opnum4 { OP_ACCESS = 3, -- 1.7.2.1