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| author | Stefan Weinhuber <wein@de.ibm.com> | 2011-01-05 12:48:03 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2011-01-05 12:47:30 +0100 |
| commit | a4d26c6aeceea330ee5e0fb6b017d57e3b252d29 (patch) | |
| tree | eed358de48ff28e4fba73d9925abafa2699a7b6c /drivers/s390/block/dasd_int.h | |
| parent | ef19298b406f93af4bb249f0776deb8366e97532 (diff) | |
| download | linux-a4d26c6aeceea330ee5e0fb6b017d57e3b252d29.tar.gz | |
[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>
Diffstat (limited to 'drivers/s390/block/dasd_int.h')
| -rw-r--r-- | drivers/s390/block/dasd_int.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h index 500678d7116c2b..ba038ef57606b9 100644 --- a/drivers/s390/block/dasd_int.h +++ b/drivers/s390/block/dasd_int.h @@ -231,6 +231,7 @@ struct dasd_ccw_req { /* 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 @@ struct dasd_discipline { 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 @@ extern struct dasd_discipline *dasd_diag_discipline_pointer; #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_device { 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 @@ void dasd_generic_remove (struct ccw_device *cdev); 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 *); |