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.
The FSID presence check also informs servers that this client has
recognized the LEASE_MOVED condition and that therefore the server
should no longer assert LEASE_MOVED for that client.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/nfs/nfs4_fs.h | 2 ++
fs/nfs/nfs4state.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 65 insertions(+), 1 deletion(-)
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index b4d7559..5c14712 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -30,6 +30,7 @@ enum nfs4_client_state {
NFS4CLNT_PURGE_STATE,
NFS4CLNT_BIND_CONN_TO_SESSION,
NFS4CLNT_MOVED,
+ NFS4CLNT_LEASE_MOVED,
};
#define NFS4_RENEW_TIMEOUT 0x01
@@ -359,6 +360,7 @@ extern void nfs4_schedule_state_manager(struct nfs_client *);
extern void nfs4_schedule_path_down_recovery(struct nfs_client *clp);
extern int nfs4_schedule_stateid_recovery(const struct nfs_server *, struct nfs4_state *);
extern int nfs4_schedule_migration_recovery(const struct nfs_server *);
+extern void nfs4_schedule_lease_moved_recovery(struct nfs_client *);
extern void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags);
extern void nfs41_handle_server_scope(struct nfs_client *,
struct nfs41_server_scope **);
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 9443b67..175c0c7 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1231,6 +1231,22 @@ 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;
@@ -1660,7 +1676,6 @@ 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);
@@ -1962,6 +1977,45 @@ 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)
+{
+ struct nfs_server *server;
+
+ dprintk("%s: lease moved reported on \"%s\"\n", __func__,
+ clp->cl_hostname);
+
+ 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);
+ if (status != -NFS4ERR_MOVED)
+ goto restart; /* wasn't this one */
+ if (nfs4_try_migration(server) == -NFS4ERR_LEASE_MOVED)
+ goto restart; /* there are more */
+ goto out;
+ }
+ rcu_read_unlock();
+
+out:
+ return 0;
+}
+
/**
* nfs4_discover_server_trunking - Detect server IP address trunking
*
@@ -2300,6 +2354,14 @@ static void nfs4_state_manager(struct nfs_client *clp)
continue;
}
+ 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;
+ continue;
+ }
+
/* First recover reboot state... */
if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) {
section = "reclaim reboot";
--
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