nfs4.1: add BIND_CONN_TO_SESSION operation
This patch adds the BIND_CONN_TO_SESSION operation which is needed for upcoming SP4_MACH_CRED work and useful for recovering from broken connections without destroying the session. Signed-off-by: Weston Andros Adamson <dros@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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d23d61c8d3
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7c44f1ae4a
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@ -211,6 +211,7 @@ struct vfsmount *nfs4_submount(struct nfs_server *, struct dentry *,
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extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *);
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extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *);
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extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
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extern int nfs4_proc_bind_conn_to_session(struct nfs_client *);
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extern int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred);
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extern int nfs4_init_clientid(struct nfs_client *, struct rpc_cred *);
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extern int nfs41_init_clientid(struct nfs_client *, struct rpc_cred *);
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@ -5099,6 +5099,60 @@ nfs41_same_server_scope(struct nfs41_server_scope *a,
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return false;
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}
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/*
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* nfs4_proc_bind_conn_to_session()
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*
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* The 4.1 client currently uses the same TCP connection for the
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* fore and backchannel.
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*/
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int nfs4_proc_bind_conn_to_session(struct nfs_client *clp)
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{
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int status;
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struct nfs41_bind_conn_to_session_res res;
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struct rpc_message msg = {
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.rpc_proc =
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&nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
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.rpc_argp = clp,
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.rpc_resp = &res,
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};
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dprintk("--> %s\n", __func__);
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BUG_ON(clp == NULL);
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res.session = kzalloc(sizeof(struct nfs4_session), GFP_NOFS);
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if (unlikely(res.session == NULL)) {
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status = -ENOMEM;
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goto out;
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}
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status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
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if (status == 0) {
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if (memcmp(res.session->sess_id.data,
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clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
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dprintk("NFS: %s: Session ID mismatch\n", __func__);
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status = -EIO;
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goto out_session;
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}
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if (res.dir != NFS4_CDFS4_BOTH) {
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dprintk("NFS: %s: Unexpected direction from server\n",
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__func__);
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status = -EIO;
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goto out_session;
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}
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if (res.use_conn_in_rdma_mode) {
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dprintk("NFS: %s: Server returned RDMA mode = true\n",
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__func__);
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status = -EIO;
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goto out_session;
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}
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}
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out_session:
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kfree(res.session);
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out:
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dprintk("<-- %s status= %d\n", __func__, status);
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return status;
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}
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/*
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* nfs4_proc_exchange_id()
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*
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@ -326,6 +326,16 @@ static int nfs4_stat_to_errno(int);
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1 /* csr_flags */ + \
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decode_channel_attrs_maxsz + \
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decode_channel_attrs_maxsz)
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#define encode_bind_conn_to_session_maxsz (op_encode_hdr_maxsz + \
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/* bctsa_sessid */ \
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XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
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1 /* bctsa_dir */ + \
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1 /* bctsa_use_conn_in_rdma_mode */)
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#define decode_bind_conn_to_session_maxsz (op_decode_hdr_maxsz + \
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/* bctsr_sessid */ \
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XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
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1 /* bctsr_dir */ + \
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1 /* bctsr_use_conn_in_rdma_mode */)
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#define encode_destroy_session_maxsz (op_encode_hdr_maxsz + 4)
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#define decode_destroy_session_maxsz (op_decode_hdr_maxsz)
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#define encode_sequence_maxsz (op_encode_hdr_maxsz + \
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@ -719,6 +729,12 @@ static int nfs4_stat_to_errno(int);
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decode_putfh_maxsz + \
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decode_secinfo_maxsz)
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#if defined(CONFIG_NFS_V4_1)
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#define NFS4_enc_bind_conn_to_session_sz \
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(compound_encode_hdr_maxsz + \
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encode_bind_conn_to_session_maxsz)
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#define NFS4_dec_bind_conn_to_session_sz \
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(compound_decode_hdr_maxsz + \
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decode_bind_conn_to_session_maxsz)
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#define NFS4_enc_exchange_id_sz \
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(compound_encode_hdr_maxsz + \
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encode_exchange_id_maxsz)
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@ -1669,6 +1685,20 @@ static void encode_secinfo(struct xdr_stream *xdr, const struct qstr *name, stru
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#if defined(CONFIG_NFS_V4_1)
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/* NFSv4.1 operations */
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static void encode_bind_conn_to_session(struct xdr_stream *xdr,
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struct nfs4_session *session,
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struct compound_hdr *hdr)
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{
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__be32 *p;
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encode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION,
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decode_bind_conn_to_session_maxsz, hdr);
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encode_opaque_fixed(xdr, session->sess_id.data, NFS4_MAX_SESSIONID_LEN);
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p = xdr_reserve_space(xdr, 8);
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*p++ = cpu_to_be32(NFS4_CDFC4_BACK_OR_BOTH);
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*p = 0; /* use_conn_in_rdma_mode = False */
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}
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static void encode_exchange_id(struct xdr_stream *xdr,
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struct nfs41_exchange_id_args *args,
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struct compound_hdr *hdr)
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@ -2629,6 +2659,22 @@ static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
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}
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#if defined(CONFIG_NFS_V4_1)
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/*
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* BIND_CONN_TO_SESSION request
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*/
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static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
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struct xdr_stream *xdr,
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struct nfs_client *clp)
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{
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struct compound_hdr hdr = {
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.minorversion = clp->cl_mvops->minor_version,
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};
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encode_compound_hdr(xdr, req, &hdr);
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encode_bind_conn_to_session(xdr, clp->cl_session, &hdr);
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encode_nops(&hdr);
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}
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/*
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* EXCHANGE_ID request
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*/
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@ -5366,6 +5412,37 @@ static int decode_sessionid(struct xdr_stream *xdr, struct nfs4_sessionid *sid)
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return decode_opaque_fixed(xdr, sid->data, NFS4_MAX_SESSIONID_LEN);
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}
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static int decode_bind_conn_to_session(struct xdr_stream *xdr,
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struct nfs41_bind_conn_to_session_res *res)
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{
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__be32 *p;
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int status;
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status = decode_op_hdr(xdr, OP_BIND_CONN_TO_SESSION);
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if (!status)
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status = decode_sessionid(xdr, &res->session->sess_id);
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if (unlikely(status))
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return status;
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/* dir flags, rdma mode bool */
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p = xdr_inline_decode(xdr, 8);
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if (unlikely(!p))
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goto out_overflow;
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res->dir = be32_to_cpup(p++);
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if (res->dir == 0 || res->dir > NFS4_CDFS4_BOTH)
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return -EIO;
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if (be32_to_cpup(p) == 0)
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res->use_conn_in_rdma_mode = false;
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else
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res->use_conn_in_rdma_mode = true;
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return 0;
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out_overflow:
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print_overflow_msg(__func__, xdr);
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return -EIO;
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}
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static int decode_create_session(struct xdr_stream *xdr,
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struct nfs41_create_session_res *res)
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{
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@ -6647,6 +6724,22 @@ out:
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}
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#if defined(CONFIG_NFS_V4_1)
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/*
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* Decode BIND_CONN_TO_SESSION response
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*/
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static int nfs4_xdr_dec_bind_conn_to_session(struct rpc_rqst *rqstp,
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struct xdr_stream *xdr,
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void *res)
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{
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struct compound_hdr hdr;
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int status;
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status = decode_compound_hdr(xdr, &hdr);
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if (!status)
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status = decode_bind_conn_to_session(xdr, res);
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return status;
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}
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/*
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* Decode EXCHANGE_ID response
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*/
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@ -7128,6 +7221,8 @@ struct rpc_procinfo nfs4_procedures[] = {
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PROC(RELEASE_LOCKOWNER, enc_release_lockowner, dec_release_lockowner),
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PROC(SECINFO, enc_secinfo, dec_secinfo),
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#if defined(CONFIG_NFS_V4_1)
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PROC(BIND_CONN_TO_SESSION,
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enc_bind_conn_to_session, dec_bind_conn_to_session),
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PROC(EXCHANGE_ID, enc_exchange_id, dec_exchange_id),
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PROC(CREATE_SESSION, enc_create_session, dec_create_session),
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PROC(DESTROY_SESSION, enc_destroy_session, dec_destroy_session),
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@ -69,6 +69,10 @@
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#define NFS4_CDFC4_FORE_OR_BOTH 0x3
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#define NFS4_CDFC4_BACK_OR_BOTH 0x7
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#define NFS4_CDFS4_FORE 0x1
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#define NFS4_CDFS4_BACK 0x2
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#define NFS4_CDFS4_BOTH 0x3
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#define NFS4_SET_TO_SERVER_TIME 0
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#define NFS4_SET_TO_CLIENT_TIME 1
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@ -589,6 +593,7 @@ enum {
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NFSPROC4_CLNT_SECINFO,
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/* nfs41 */
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NFSPROC4_CLNT_BIND_CONN_TO_SESSION,
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NFSPROC4_CLNT_EXCHANGE_ID,
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NFSPROC4_CLNT_CREATE_SESSION,
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NFSPROC4_CLNT_DESTROY_SESSION,
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@ -1125,6 +1125,12 @@ struct nfs41_impl_id {
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struct nfstime4 date;
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};
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struct nfs41_bind_conn_to_session_res {
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struct nfs4_session *session;
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u32 dir;
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bool use_conn_in_rdma_mode;
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};
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struct nfs41_exchange_id_res {
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struct nfs_client *client;
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u32 flags;
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