From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benny Halevy Subject: [PATCH 08/10] nfsd41: Backchannel: cb_sequence callback Date: Fri, 4 Sep 2009 19:32:52 +0300 Message-ID: <1252081972-19699-1-git-send-email-bhalevy@panasas.com> References: <4AA13DE3.8020800@panasas.com> Cc: pnfs@linux-nfs.org, linux-nfs@vger.kernel.org, Benny Halevy , Ricardo Labiaga , Andy Adamson To: " J. Bruce Fields" Return-path: Received: from dip-colo-pa.panasas.com ([67.152.220.67]:52539 "EHLO daytona.int.panasas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933719AbZIDQcw (ORCPT ); Fri, 4 Sep 2009 12:32:52 -0400 In-Reply-To: <4AA13DE3.8020800@panasas.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: Implement the cb_sequence callback conforming to draft-ietf-nfsv4-minorversion1 Note: highest slot id and target highest slot id do not have to be 0 as was previously implemented. They can be greater than what the nfs server sent if the client supports a larger slot table on the backchannel. At this point we just ignore that. Signed-off-by: Benny Halevy Signed-off-by: Ricardo Labiaga [Rework the back channel xdr using the shared v4.0 and v4.1 framework.] Signed-off-by: Andy Adamson [fixed indentation] Signed-off-by: Benny Halevy [nfsd41: use nfsd4_cb_sequence for callback minorversion] Signed-off-by: Benny Halevy [nfsd41: fix verification of CB_SEQUENCE highest slot id[ Signed-off-by: Benny Halevy [nfsd41: Backchannel: Remove old backchannel serialization] [nfsd41: Backchannel: First callback sequence ID should be 1] Signed-off-by: Ricardo Labiaga Signed-off-by: Benny Halevy [nfsd41: decode_cb_sequence does not need to actually decode ignored fields] Signed-off-by: Benny Halevy Signed-off-by: Ricardo Labiaga Signed-off-by: Benny Halevy --- fs/nfsd/nfs4callback.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 72 insertions(+), 0 deletions(-) diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c index da36a46..2282594 100644 --- a/fs/nfsd/nfs4callback.c +++ b/fs/nfsd/nfs4callback.c @@ -256,6 +256,27 @@ encode_cb_recall(struct xdr_stream *xdr, struct nfs4_delegation *dp, hdr->nops++; } +static void +encode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *args, + struct nfs4_cb_compound_hdr *hdr) +{ + __be32 *p; + + if (hdr->minorversion == 0) + return; + + RESERVE_SPACE(1 + NFS4_MAX_SESSIONID_LEN + 20); + + WRITE32(OP_CB_SEQUENCE); + WRITEMEM(args->cbs_clp->cl_sessionid.data, NFS4_MAX_SESSIONID_LEN); + WRITE32(args->cbs_clp->cl_cb_seq_nr); + WRITE32(0); /* slotid, always 0 */ + WRITE32(0); /* highest slotid always 0 */ + WRITE32(0); /* cachethis always 0 */ + WRITE32(0); /* FIXME: support referring_call_lists */ + hdr->nops++; +} + static int nfs4_xdr_enc_cb_null(struct rpc_rqst *req, __be32 *p) { @@ -317,6 +338,57 @@ decode_cb_op_hdr(struct xdr_stream *xdr, enum nfs_opnum4 expected) return 0; } +/* + * Our current back channel implmentation supports a single backchannel + * with a single slot. + */ +static int +decode_cb_sequence(struct xdr_stream *xdr, struct nfsd4_cb_sequence *res, + struct rpc_rqst *rqstp) +{ + struct nfs4_sessionid id; + int status; + u32 dummy; + __be32 *p; + + if (res->cbs_minorversion == 0) + return 0; + + status = decode_cb_op_hdr(xdr, OP_CB_SEQUENCE); + if (status) + return status; + + /* + * If the server returns different values for sessionID, slotID or + * sequence number, the server is looney tunes. + */ + status = -ESERVERFAULT; + + READ_BUF(NFS4_MAX_SESSIONID_LEN + 16); + memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); + p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); + if (memcmp(id.data, res->cbs_clp->cl_sessionid.data, + NFS4_MAX_SESSIONID_LEN)) { + dprintk("%s Invalid session id\n", __func__); + goto out; + } + READ32(dummy); + if (dummy != res->cbs_clp->cl_cb_seq_nr) { + dprintk("%s Invalid sequence number\n", __func__); + goto out; + } + READ32(dummy); /* slotid must be 0 */ + if (dummy != 0) { + dprintk("%s Invalid slotid\n", __func__); + goto out; + } + /* FIXME: process highest slotid and target highest slotid */ + status = 0; +out: + return status; +} + + static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, __be32 *p) { -- 1.6.4