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authorChuck Lever <chuck.lever@oracle.com>2013-10-17 14:13:35 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2013-10-28 15:30:21 -0400
commitb7f7a66e420a9f3ec82a5124720013cee317e73a (patch)
treebe7da5ca8b2bf98e2e91237503101eb77d389d87 /fs/nfs/nfs4state.c
parent44c9993384e9311cd56acf6ead3baffab616ae50 (diff)
downloadlinux-b7f7a66e420a9f3ec82a5124720013cee317e73a.tar.bz2
NFS: Support NFS4ERR_LEASE_MOVED recovery in state manager
A migration on the FSID in play for the current NFS operation is reported via the error status code NFS4ERR_MOVED. "Lease moved" means that a migration has occurred on some other FSID than the one for the current operation. It's a signal that the client should take action immediately to handle a migration that it may not have noticed otherwise. This is so that the client's lease does not expire unnoticed on the destination server. In NFSv4.0, a moved lease is reported with the NFS4ERR_LEASE_MOVED error status code. To recover from NFS4ERR_LEASE_MOVED, check each FSID for that server to see if it is still present. Invoke nfs4_try_migration() if the FSID is no longer present on the server. Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/nfs4state.c')
-rw-r--r--fs/nfs/nfs4state.c73
1 files changed, 72 insertions, 1 deletions
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index ba0db18b5f67..552706d2d776 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1233,6 +1233,22 @@ int nfs4_schedule_migration_recovery(const struct nfs_server *server)
}
EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery);
+/**
+ * nfs4_schedule_lease_moved_recovery - start lease-moved recovery
+ *
+ * @clp: server to check for moved leases
+ *
+ */
+void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp)
+{
+ dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n",
+ __func__, clp->cl_clientid, clp->cl_hostname);
+
+ set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state);
+ nfs4_schedule_state_manager(clp);
+}
+EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery);
+
int nfs4_wait_clnt_recover(struct nfs_client *clp)
{
int res;
@@ -1661,7 +1677,6 @@ static int nfs4_recovery_handle_error(struct nfs_client *clp, int error)
nfs4_state_end_reclaim_reboot(clp);
break;
case -NFS4ERR_STALE_CLIENTID:
- case -NFS4ERR_LEASE_MOVED:
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
nfs4_state_clear_reclaim_reboot(clp);
nfs4_state_start_reclaim_reboot(clp);
@@ -1975,6 +1990,55 @@ restart:
return 0;
}
+/*
+ * Test each nfs_server on the clp's cl_superblocks list to see
+ * if it's moved to another server. Stop when the server no longer
+ * returns NFS4ERR_LEASE_MOVED.
+ */
+static int nfs4_handle_lease_moved(struct nfs_client *clp)
+{
+ const struct nfs4_state_maintenance_ops *ops =
+ clp->cl_mvops->state_renewal_ops;
+ struct nfs_server *server;
+ struct rpc_cred *cred;
+
+ dprintk("%s: lease moved reported on \"%s\"\n", __func__,
+ clp->cl_hostname);
+
+ spin_lock(&clp->cl_lock);
+ cred = ops->get_state_renewal_cred_locked(clp);
+ spin_unlock(&clp->cl_lock);
+ if (cred == NULL)
+ return -NFS4ERR_NOENT;
+
+ clp->cl_mig_gen++;
+restart:
+ rcu_read_lock();
+ list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
+ struct inode *inode;
+ int status;
+
+ if (server->mig_gen == clp->cl_mig_gen)
+ continue;
+ server->mig_gen = clp->cl_mig_gen;
+
+ rcu_read_unlock();
+
+ inode = server->super->s_root->d_inode;
+ status = nfs4_proc_fsid_present(inode, cred);
+ if (status != -NFS4ERR_MOVED)
+ goto restart; /* wasn't this one */
+ if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED)
+ goto restart; /* there are more */
+ goto out;
+ }
+ rcu_read_unlock();
+
+out:
+ put_rpccred(cred);
+ return 0;
+}
+
/**
* nfs4_discover_server_trunking - Detect server IP address trunking
*
@@ -2312,6 +2376,13 @@ static void nfs4_state_manager(struct nfs_client *clp)
goto out_error;
}
+ if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) {
+ section = "lease moved";
+ status = nfs4_handle_lease_moved(clp);
+ if (status < 0)
+ goto out_error;
+ }
+
/* First recover reboot state... */
if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
section = "reclaim reboot";