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NFS: Treat NFS4ERR_CLID_INUSE as a fatal error 

For NFSv4 minor version 0, currently the cl_id_uniquifier allows the
Linux client to generate a unique nfs_client_id4 string whenever a
server replies with NFS4ERR_CLID_INUSE.

This implementation seems to be based on a flawed reading of RFC
3530.  NFS4ERR_CLID_INUSE actually means that the client has presented
this nfs_client_id4 string with a different principal at some time in
the past, and that lease is still in use on the server.

For a Linux client this might be rather difficult to achieve: the
authentication flavor is named right in the nfs_client_id4.id
string.  If we change flavors, we change strings automatically.

So, practically speaking, NFS4ERR_CLID_INUSE means there is some other
client using our string.  There is not much that can be done to
recover automatically.  Let's make it a permanent error.

Remove the recovery logic in nfs4_proc_setclientid(), and remove the
cl_id_uniquifier field from the nfs_client data structure.  And,
remove the authentication flavor from the nfs_client_id4 string.

Keeping the authentication flavor in the nfs_client_id4.id string
means that we could have a separate lease for each authentication
flavor used by mounts on the client.  But we want just one lease for
all the mounts on this client.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2012-07-11 16:30:50 -04:00 committed by Trond Myklebust
parent 46a87b8a7b
commit de73483122
3 changed files with 23 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
fs/nfs/nfs4proc.c
View File

@ -4029,42 +4029,28 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
.rpc_resp = res,
.rpc_cred = cred,
};
int loop = 0;
int status;
/* nfs_client_id4 */
nfs4_init_boot_verifier(clp, &sc_verifier);
for(;;) {
rcu_read_lock();
setclientid.sc_name_len = scnprintf(setclientid.sc_name,
sizeof(setclientid.sc_name), "%s/%s %s %s %u",
sizeof(setclientid.sc_name), "%s/%s %s",
clp->cl_ipaddr,
rpc_peeraddr2str(clp->cl_rpcclient,
RPC_DISPLAY_ADDR),
rpc_peeraddr2str(clp->cl_rpcclient,
RPC_DISPLAY_PROTO),
clp->cl_rpcclient->cl_auth->au_ops->au_name,
clp->cl_id_uniquifier);
RPC_DISPLAY_PROTO));
/* cb_client4 */
setclientid.sc_netid_len = scnprintf(setclientid.sc_netid,
sizeof(setclientid.sc_netid),
rpc_peeraddr2str(clp->cl_rpcclient,
RPC_DISPLAY_NETID));
rcu_read_unlock();
setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
sizeof(setclientid.sc_uaddr), "%s.%u.%u",
clp->cl_ipaddr, port >> 8, port & 255);
rcu_read_unlock();
status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
if (status != -NFS4ERR_CLID_INUSE)
break;
if (loop != 0) {
++clp->cl_id_uniquifier;
break;
}
++loop;
ssleep(clp->cl_lease_time / HZ + 1);
}
return status;
return rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
}
int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
@ -5262,10 +5248,9 @@ int nfs4_proc_exchange_id(struct nfs_client *clp, struct rpc_cred *cred)
nfs4_init_boot_verifier(clp, &verifier);
args.id_len = scnprintf(args.id, sizeof(args.id),
"%s/%s/%u",
"%s/%s",
clp->cl_ipaddr,
clp->cl_rpcclient->cl_nodename,
clp->cl_rpcclient->cl_auth->au_flavor);
clp->cl_rpcclient->cl_nodename);
res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
GFP_NOFS);

7
fs/nfs/nfs4state.c
View File

@ -1606,10 +1606,15 @@ static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status)
return -ESERVERFAULT;
/* Lease confirmation error: retry after purging the lease */
ssleep(1);
case -NFS4ERR_CLID_INUSE:
case -NFS4ERR_STALE_CLIENTID:
clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
break;
case -NFS4ERR_CLID_INUSE:
pr_err("NFS: Server %s reports our clientid is in use\n",
clp->cl_hostname);
nfs_mark_client_ready(clp, -EPERM);
clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state);
return -EPERM;
case -EACCES:
if (clp->cl_machine_cred == NULL)
return -EACCES;

3
include/linux/nfs_fs_sb.h
View File

@ -69,10 +69,9 @@ struct nfs_client {
struct idmap * cl_idmap;
/* Our own IP address, as a null-terminated string.
* This is used to generate the clientid, and the callback address.
* This is used to generate the mv0 callback address.
*/
char cl_ipaddr[48];
unsigned char cl_id_uniquifier;
u32 cl_cb_ident; /* v4.0 callback identifier */
const struct nfs4_minor_version_ops *cl_mvops;