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| author | Stefan Haberland <sth@linux.ibm.com> | 2022-09-20 21:26:13 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-09-21 08:32:51 -0600 |
| commit | 413862caad6fe7fddec639219bccfdab60333551 (patch) | |
| tree | 06e12d8e93196e5b96d7182c7a1d4aa0206e3a71 /drivers/s390/block/dasd_int.h | |
| parent | a91ff09d39f9b6545254839ac91f1ff7bd21d39e (diff) | |
| download | linux-413862caad6fe7fddec639219bccfdab60333551.tar.gz | |
s390/dasd: add copy pair swap capability
In case of errors or misbehaviour of the primary device a controlled
failover to one of the configured secondary devices needs to be
performed.
The swap processing stops I/O on the primary device, all requests are
re-queued to the blocklayer queue, the entries in the copy relation are
swapped and finally the link to the blockdevice is moved from primary to
secondary dasd device.
After this, the secondary becomes the new primary device and I/O is
restarted on that device.
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Link: https://lore.kernel.org/r/20220920192616.808070-5-sth@linux.ibm.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/s390/block/dasd_int.h')
| -rw-r--r-- | drivers/s390/block/dasd_int.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h index d9794ec0372241..3c55c29155efcf 100644 --- a/drivers/s390/block/dasd_int.h +++ b/drivers/s390/block/dasd_int.h @@ -438,6 +438,7 @@ struct dasd_discipline { int (*ese_read)(struct dasd_ccw_req *, struct irb *); int (*pprc_status)(struct dasd_device *, struct dasd_pprc_data_sc4 *); bool (*pprc_enabled)(struct dasd_device *); + int (*copy_pair_swap)(struct dasd_device *, char *, char *); }; extern struct dasd_discipline *dasd_diag_discipline_pointer; @@ -681,6 +682,7 @@ struct dasd_queue { #define DASD_STOPPED_PENDING 4 /* long busy */ #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ #define DASD_STOPPED_SU 16 /* summary unit check handling */ +#define DASD_STOPPED_PPRC 32 /* PPRC swap */ #define DASD_STOPPED_NOSPC 128 /* no space left */ /* per device flags */ @@ -706,6 +708,22 @@ struct dasd_queue { void dasd_put_device_wake(struct dasd_device *); /* + * return values to be returned from the copy pair swap function + * 0x00: swap successful + * 0x01: swap data invalid + * 0x02: no active device found + * 0x03: wrong primary specified + * 0x04: secondary device not found + * 0x05: swap already running + */ +#define DASD_COPYPAIRSWAP_SUCCESS 0 +#define DASD_COPYPAIRSWAP_INVALID 1 +#define DASD_COPYPAIRSWAP_NOACTIVE 2 +#define DASD_COPYPAIRSWAP_PRIMARY 3 +#define DASD_COPYPAIRSWAP_SECONDARY 4 +#define DASD_COPYPAIRSWAP_MULTIPLE 5 + +/* * Reference count inliners */ static inline void @@ -889,6 +907,8 @@ int dasd_generic_verify_path(struct dasd_device *, __u8); void dasd_generic_space_exhaust(struct dasd_device *, struct dasd_ccw_req *); void dasd_generic_space_avail(struct dasd_device *); +int dasd_generic_requeue_all_requests(struct dasd_device *); + int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); char *dasd_get_sense(struct irb *); |