Finally, to enable support for migration, insert migration recovery
callouts in the synchronous and asynchronous error handling paths for
NFSv4 procedures.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/nfs/nfs4proc.c | 61 ++++++++++++++++++++++++++++++++++++++++-------------
1 files changed, 46 insertions(+), 15 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index bdd8aac..2537a18 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -71,7 +71,8 @@ struct nfs4_opendata;
static int _nfs4_proc_open(struct nfs4_opendata *data);
static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
-static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
+static int nfs4_async_handle_error(struct rpc_task *, struct nfs_server *,
+ struct nfs4_state *);
static int _nfs4_proc_lookup(struct inode *dir, const struct qstr *name, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
@@ -239,10 +240,17 @@ static int nfs4_delay(struct rpc_clnt *clnt, long *timeout)
return res;
}
-/* This is the error handling routine for processes that are allowed
- * to sleep.
+/**
+ * nfs4_handle_exception - Common error handling for callers allowed to sleep
+ *
+ * @server: local state context for the server
+ * @errorcode: NFS4ERR value returned from the server
+ * @exception: exception handling state
+ *
+ * Returns zero on success, or a negative errno value.
*/
-static int nfs4_handle_exception(const struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
+static int nfs4_handle_exception(struct nfs_server *server, int errorcode,
+ struct nfs4_exception *exception)
{
struct nfs_client *clp = server->nfs_client;
struct nfs4_state *state = exception->state;
@@ -277,6 +285,9 @@ static int nfs4_handle_exception(const struct nfs_server *server, int errorcode,
exception->retry = 1;
break;
#endif /* defined(CONFIG_NFS_V4_1) */
+ case -NFS4ERR_MOVED:
+ nfs4_schedule_migration_recovery(server);
+ goto recovery_wait;
case -NFS4ERR_FILE_OPEN:
if (exception->timeout > HZ) {
/* We have retried a decent amount, time to
@@ -298,6 +309,7 @@ static int nfs4_handle_exception(const struct nfs_server *server, int errorcode,
return nfs4_map_errors(ret);
do_state_recovery:
nfs4_schedule_state_recovery(clp);
+recovery_wait:
ret = nfs4_wait_clnt_recover(clp);
if (ret == 0)
exception->retry = 1;
@@ -2194,10 +2206,14 @@ static int nfs4_get_referral(struct inode *dir, const struct qstr *name, struct
status = nfs4_proc_fs_locations(dir, name, locations, page);
if (status != 0)
goto out;
- /* Make sure server returned a different fsid for the referral */
+
+ /*
+ * If the fsid didn't change, this is a migration event, not a
+ * referral. Cause us to drop into the exception handler, which
+ * will kick off migration recovery.
+ */
if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &locations->fattr.fsid)) {
- dprintk("%s: server did not return a different fsid for a referral at %s\n", __func__, name->name);
- status = -EIO;
+ status = -NFS4ERR_MOVED;
goto out;
}
@@ -3492,8 +3508,18 @@ static int nfs4_proc_set_acl(struct inode *inode, const void *buf, size_t buflen
return err;
}
-static int
-nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server, struct nfs4_state *state)
+/**
+ * nfs4_async_handle_error - Common error handling for callers who cannot sleep
+ *
+ * @task: active RPC task
+ * @server: local state for the server
+ * @state: NFSv4 state for active operation
+ *
+ * Returns zero on success, or a negative errno value.
+ */
+static int nfs4_async_handle_error(struct rpc_task *task,
+ struct nfs_server *server,
+ struct nfs4_state *state)
{
struct nfs_client *clp = server->nfs_client;
@@ -3522,19 +3548,23 @@ nfs4_async_handle_error(struct rpc_task *task, const struct nfs_server *server,
dprintk("%s ERROR %d, Reset session\n", __func__,
task->tk_status);
nfs4_schedule_state_recovery(clp);
- task->tk_status = 0;
- return -EAGAIN;
+ goto restart_call;
#endif /* CONFIG_NFS_V4_1 */
+ case -NFS4ERR_MOVED:
+ rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
+ nfs4_schedule_migration_recovery(server);
+ if (test_bit(NFS4CLNT_MANAGER_RUNNING,
+ &clp->cl_state) == 0)
+ rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
+ goto restart_call;
case -NFS4ERR_DELAY:
nfs_inc_server_stats(server, NFSIOS_DELAY);
case -NFS4ERR_GRACE:
case -EKEYEXPIRED:
rpc_delay(task, NFS4_POLL_RETRY_MAX);
- task->tk_status = 0;
- return -EAGAIN;
+ goto restart_call;
case -NFS4ERR_OLD_STATEID:
- task->tk_status = 0;
- return -EAGAIN;
+ goto restart_call;
}
task->tk_status = nfs4_map_errors(task->tk_status);
return 0;
@@ -3543,6 +3573,7 @@ do_state_recovery:
nfs4_schedule_state_recovery(clp);
if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
+restart_call:
task->tk_status = 0;
return -EAGAIN;
}
--
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