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NFS detect session trunking

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Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Andy Adamson 2016-09-09 09:22:21 -04:00 committed by Anna Schumaker
parent e7b7cbf662
commit ba84db96aa
2 changed files with 92 additions and 0 deletions
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2
fs/nfs/nfs4_fs.h
View File

@ -278,6 +278,8 @@ 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)

90
fs/nfs/nfs4client.c
View File

@ -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
*