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author | Andy Adamson <andros@netapp.com> | 2016-09-09 09:22:21 -0400 |
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committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2016-09-19 13:08:36 -0400 |
commit | ba84db96aa07995b853db403a3eba2249f0fa4e3 (patch) | |
tree | b513ff1fc7ba28e8b7d4fbd8289b8d3b02bc0147 /fs/nfs/nfs4client.c | |
parent | e7b7cbf662deb857539cd4b594451ea89c4d7ee6 (diff) | |
download | linux-stable-ba84db96aa07995b853db403a3eba2249f0fa4e3.tar.gz linux-stable-ba84db96aa07995b853db403a3eba2249f0fa4e3.tar.bz2 linux-stable-ba84db96aa07995b853db403a3eba2249f0fa4e3.zip |
NFS detect session trunking
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/nfs4client.c')
-rw-r--r-- | fs/nfs/nfs4client.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c index 0077b2eadfae..6914d4b176ae 100644 --- a/fs/nfs/nfs4client.c +++ b/fs/nfs/nfs4client.c @@ -595,6 +595,96 @@ 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) +{ + /* Check eir_clientid */ + if (!nfs4_match_clientids(clp->cl_clientid, res->clientid)) + goto out_err; + + /* Check eir_server_owner so_major_id */ + if (!nfs4_check_serverowner_major_id(clp->cl_serverowner, + res->server_owner)) + goto out_err; + + /* Check eir_server_owner so_minor_id */ + if (!nfs4_check_serverowner_minor_id(clp->cl_serverowner, + res->server_owner)) + goto out_err; + + /* Check eir_server_scope */ + if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope)) + goto out_err; + + pr_info("NFS: %s: Session trunking succeeded for %s\n", + clp->cl_hostname, + xprt->address_strings[RPC_DISPLAY_ADDR]); + + return 0; +out_err: + pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname, + xprt->address_strings[RPC_DISPLAY_ADDR]); + + return -EINVAL; +} + /** * nfs41_walk_client_list - Find nfs_client that matches a client/server owner * |