[S390] dasd: do path verification for paths added at runtime
When a new path is added at runtime, the CIO layer will call the drivers
path_event callback. The DASD device driver uses this callback to trigger
a path verification for the new path. The driver will use only those
paths for I/O, which have been successfully verified.
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index 500678d..ba038ef 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -231,6 +231,7 @@
/* per dasd_ccw_req flags */
#define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
#define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
+#define DASD_CQR_VERIFY_PATH 2 /* path verification request */
/* Signature for error recovery functions. */
typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
@@ -287,6 +288,14 @@
int (*do_analysis) (struct dasd_block *);
/*
+ * This function is called, when new paths become available.
+ * Disciplins may use this callback to do necessary setup work,
+ * e.g. verify that new path is compatible with the current
+ * configuration.
+ */
+ int (*verify_path)(struct dasd_device *, __u8);
+
+ /*
* Last things to do when a device is set online, and first things
* when it is set offline.
*/
@@ -362,6 +371,13 @@
#define DASD_EER_STATECHANGE 3
#define DASD_EER_PPRCSUSPEND 4
+struct dasd_path {
+ __u8 opm;
+ __u8 tbvpm;
+ __u8 ppm;
+ __u8 npm;
+};
+
struct dasd_device {
/* Block device stuff. */
struct dasd_block *block;
@@ -377,6 +393,7 @@
struct dasd_discipline *discipline;
struct dasd_discipline *base_discipline;
char *private;
+ struct dasd_path path_data;
/* Device state and target state. */
int state, target;
@@ -620,10 +637,15 @@
int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
int dasd_generic_set_offline (struct ccw_device *cdev);
int dasd_generic_notify(struct ccw_device *, int);
+int dasd_generic_last_path_gone(struct dasd_device *);
+int dasd_generic_path_operational(struct dasd_device *);
+
void dasd_generic_handle_state_change(struct dasd_device *);
int dasd_generic_pm_freeze(struct ccw_device *);
int dasd_generic_restore_device(struct ccw_device *);
enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
+void dasd_generic_path_event(struct ccw_device *, int *);
+int dasd_generic_verify_path(struct dasd_device *, __u8);
int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
char *dasd_get_sense(struct irb *);