Return-Path: Received: from mx142.netapp.com ([216.240.21.19]:9576 "EHLO mx142.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933132AbcIAPqm (ORCPT ); Thu, 1 Sep 2016 11:46:42 -0400 From: To: CC: , , Andy Adamson Subject: [PATCH Version 9 RESEND 04/12] NFS detect session trunking Date: Thu, 1 Sep 2016 11:44:45 -0400 Message-ID: <1472744693-124241-5-git-send-email-andros@netapp.com> In-Reply-To: <1472744693-124241-1-git-send-email-andros@netapp.com> References: <1472744693-124241-1-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 Signed-off-by: Andy Adamson --- fs/nfs/nfs4_fs.h | 2 ++ fs/nfs/nfs4client.c | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 95 insertions(+) diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h index 4be567a..eb315e1 100644 --- a/fs/nfs/nfs4_fs.h +++ b/fs/nfs/nfs4_fs.h @@ -277,6 +277,8 @@ extern int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo); extern int nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync); +extern int nfs4_detect_session_trunking(struct nfs_client *clp, + struct nfs41_exchange_id_res *res, struct rpc_xprt *xprt); static inline bool is_ds_only_client(struct nfs_client *clp) diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c index f356d50..4e15ae1 100644 --- a/fs/nfs/nfs4client.c +++ b/fs/nfs/nfs4client.c @@ -595,6 +595,99 @@ out_major_mismatch: return false; } +/* + * Returns true if server minor ids match + */ +static bool +nfs4_check_serverowner_minor_id(struct nfs41_server_owner *o1, + struct nfs41_server_owner *o2) +{ + /* Check eir_server_owner so_minor_id */ + if (o1->minor_id != o2->minor_id) + goto out_minor_mismatch; + + dprintk("NFS: --> %s server owner minor IDs match\n", __func__); + return true; + +out_minor_mismatch: + dprintk("NFS: --> %s server owner minor IDs do not match\n", __func__); + return false; +} + +/* + * Returns true if the server scopes match + */ +static bool +nfs4_check_server_scope(struct nfs41_server_scope *s1, + struct nfs41_server_scope *s2) +{ + if (s1->server_scope_sz != s2->server_scope_sz) + goto out_scope_mismatch; + if (memcmp(s1->server_scope, s2->server_scope, + s1->server_scope_sz) != 0) + goto out_scope_mismatch; + + dprintk("NFS: --> %s server scopes match\n", __func__); + return true; + +out_scope_mismatch: + dprintk("NFS: --> %s server scopes do not match\n", + __func__); + return false; +} + +/** + * nfs4_detect_session_trunking - Checks for session trunking called + * after a successful EXCHANGE_ID testing a multi-addr connection to be + * potentially added as a session trunk + * + * @clp: original mount nfs_client + * @res: result structure from an exchange_id using the original mount + * nfs_client with a new multi_addr transport + * + * Returns zero on success, otherwise -EINVAL + * + * Note: since the exchange_id for the new multi_addr transport uses the + * same nfs_client from the original mount, the cl_owner_id is reused, + * so eir_clientowner is the same. + */ +int nfs4_detect_session_trunking(struct nfs_client *clp, + struct nfs41_exchange_id_res *res, + struct rpc_xprt *xprt) +{ + int status = -EINVAL; + /* Check eir_clientid */ + if (!nfs4_match_clientids(clp->cl_clientid, res->clientid)) + goto out; + + /* Check eir_server_owner so_major_id */ + if (!nfs4_check_serverowner_major_id(clp->cl_serverowner, + res->server_owner)) + goto out; + + /* Check eir_server_owner so_minor_id */ + if (!nfs4_check_serverowner_minor_id(clp->cl_serverowner, + res->server_owner)) + goto out; + + /* Check eir_server_scope */ + if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope)) + goto out; + + status = 0; +out: + if (status) + pr_info("NFS: %s: Session trunking failed for %s status %d\n", + clp->cl_hostname, + xprt->address_strings[RPC_DISPLAY_ADDR], status); + else + pr_info("NFS: %s: Session trunking succeeded for %s\n", + clp->cl_hostname, + xprt->address_strings[RPC_DISPLAY_ADDR]); + + return status; +} + /** * nfs41_walk_client_list - Find nfs_client that matches a client/server owner * -- 1.8.3.1