Return-Path: Received: from mx142.netapp.com ([216.240.21.19]:16437 "EHLO mx142.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932260AbcHKVlg (ORCPT ); Thu, 11 Aug 2016 17:41:36 -0400 From: To: CC: , , Andy Adamson Subject: [PATCH Version 8 12/12] NFS pnfs data server multipath session trunking Date: Thu, 11 Aug 2016 17:39:34 -0400 Message-ID: <1470951574-18441-13-git-send-email-andros@netapp.com> In-Reply-To: <1470951574-18441-1-git-send-email-andros@netapp.com> References: <1470951574-18441-1-git-send-email-andros@netapp.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-nfs-owner@vger.kernel.org List-ID: From: Andy Adamson Try all multipath addresses for a data server. The first address that successfully connects and creates a session is the DS mount address. All subsequent addresses are tested for session trunking and added as aliases. Signed-off-by: Andy Adamson --- fs/nfs/internal.h | 3 +++ fs/nfs/nfs4_fs.h | 1 + fs/nfs/nfs4proc.c | 33 ++++++++++++++++++++++++++++++++ fs/nfs/pnfs_nfs.c | 56 +++++++++++++++++++++++++++++++++++++++++-------------- 4 files changed, 79 insertions(+), 14 deletions(-) diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 8de509b..4f4e775 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -569,6 +569,9 @@ extern int nfs40_walk_client_list(struct nfs_client *clp, extern int nfs41_walk_client_list(struct nfs_client *clp, struct nfs_client **result, struct rpc_cred *cred); +extern int nfs4_test_session_trunk(struct rpc_clnt *, + struct rpc_xprt *, + void *); static inline struct inode *nfs_igrab_and_active(struct inode *inode) { diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h index b2a94ca..e7d2efe 100644 --- a/fs/nfs/nfs4_fs.h +++ b/fs/nfs/nfs4_fs.h @@ -59,6 +59,7 @@ struct nfs4_minor_version_ops { struct nfs4_lock_state *); struct nfs_seqid * (*alloc_seqid)(struct nfs_seqid_counter *, gfp_t); + int (*session_trunk)(struct rpc_clnt *, struct rpc_xprt *, void *); const struct rpc_call_ops *call_sync_ops; const struct nfs4_state_recovery_ops *reboot_recovery_ops; const struct nfs4_state_recovery_ops *nograce_recovery_ops; diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index ffe578c..3770f03 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -7307,6 +7307,37 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred) return _nfs4_proc_exchange_id(clp, cred, SP4_NONE, NULL); } +/** + * nfs4_test_session_trunk + * + * This is an add_xprt_test() test function called from + * rpc_clnt_setup_test_and_add_xprt. + * + * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt + * and is dereferrenced in nfs4_exchange_id_release + * + * Upon success, add the new transport to the rpc_clnt + * + * @clnt: struct rpc_clnt to get new transport + * @xprt: the rpc_xprt to test + * @data: call data for _nfs4_proc_exchange_id. + */ +int nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt, + void *data) +{ + struct nfs4_add_xprt_data *adata = (struct nfs4_add_xprt_data *)data; + u32 sp4_how; + + dprintk("--> %s try %s\n", __func__, + xprt->address_strings[RPC_DISPLAY_ADDR]); + + sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED); + + /* Test connection for session trunking. Async exchange_id call */ + return _nfs4_proc_exchange_id(adata->clp, adata->cred, sp4_how, xprt); +} +EXPORT_SYMBOL_GPL(nfs4_test_session_trunk); + static int _nfs4_proc_destroy_clientid(struct nfs_client *clp, struct rpc_cred *cred) { @@ -8885,6 +8916,7 @@ static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = { .find_root_sec = nfs41_find_root_sec, .free_lock_state = nfs41_free_lock_state, .alloc_seqid = nfs_alloc_no_seqid, + .session_trunk = nfs4_test_session_trunk, .call_sync_ops = &nfs41_call_sync_ops, .reboot_recovery_ops = &nfs41_reboot_recovery_ops, .nograce_recovery_ops = &nfs41_nograce_recovery_ops, @@ -8914,6 +8946,7 @@ static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { .free_lock_state = nfs41_free_lock_state, .call_sync_ops = &nfs41_call_sync_ops, .alloc_seqid = nfs_alloc_no_seqid, + .session_trunk = nfs4_test_session_trunk, .reboot_recovery_ops = &nfs41_reboot_recovery_ops, .nograce_recovery_ops = &nfs41_nograce_recovery_ops, .state_renewal_ops = &nfs41_state_renewal_ops, diff --git a/fs/nfs/pnfs_nfs.c b/fs/nfs/pnfs_nfs.c index f3468b5..242ce87 100644 --- a/fs/nfs/pnfs_nfs.c +++ b/fs/nfs/pnfs_nfs.c @@ -690,13 +690,48 @@ static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, dprintk("%s: DS %s: trying address %s\n", __func__, ds->ds_remotestr, da->da_remotestr); - clp = nfs4_set_ds_client(mds_srv, - (struct sockaddr *)&da->da_addr, - da->da_addrlen, IPPROTO_TCP, - timeo, retrans, minor_version, - au_flavor); - if (!IS_ERR(clp)) - break; + if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) { + struct xprt_create xprt_args = { + .ident = XPRT_TRANSPORT_TCP, + .net = clp->cl_net, + .dstaddr = (struct sockaddr *)&da->da_addr, + .addrlen = da->da_addrlen, + .servername = clp->cl_hostname, + }; + struct nfs4_add_xprt_data xprtdata = { + .clp = clp, + .cred = nfs4_get_clid_cred(clp), + }; + struct rpc_add_xprt_test rpcdata = { + .add_xprt_test = clp->cl_mvops->session_trunk, + .data = &xprtdata, + }; + + /** + * Test this address for session trunking and + * add as an alias + */ + rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, + rpc_clnt_setup_test_and_add_xprt, + &rpcdata); + } else { + clp = nfs4_set_ds_client(mds_srv, + (struct sockaddr *)&da->da_addr, + da->da_addrlen, IPPROTO_TCP, + timeo, retrans, minor_version, + au_flavor); + if (IS_ERR(clp)) + continue; + + status = nfs4_init_ds_session(clp, + mds_srv->nfs_client->cl_lease_time); + if (status) { + nfs_put_client(clp); + clp = ERR_PTR(-EIO); + continue; + } + + } } if (IS_ERR(clp)) { @@ -704,18 +739,11 @@ static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, goto out; } - status = nfs4_init_ds_session(clp, mds_srv->nfs_client->cl_lease_time); - if (status) - goto out_put; - smp_wmb(); ds->ds_clp = clp; dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); out: return status; -out_put: - nfs_put_client(clp); - goto out; } /* -- 1.8.3.1