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| author |   Jan Höppner <hoeppner@linux.vnet.ibm.com> | 2015-10-14 17:01:04 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-03-07 13:11:56 +0100 |
| commit | 46d1c03c82a717735dddc7a47f321abaccbcec78 (patch) | |
| tree | c286d5f5357065d36b34addaeeb5adc4f1f33920 /drivers/s390/block/dasd_int.h | |
| parent | s390/percpu: remove this_cpu_cmpxchg_double_4 (diff) | |
| download | linux-dev-46d1c03c82a717735dddc7a47f321abaccbcec78.tar.xz linux-dev-46d1c03c82a717735dddc7a47f321abaccbcec78.zip | |
s390/dasd: Improve dasd format code
- Make sure a calling function can rely on data in fdata by resetting to
its initial values
- Move special treatment for track 0 and 1 to dasd_eckd_build_format
- Replace dangerous backward goto with a loop logic
- Add define for number that specifies the maximum amount of CCWs per
request and is used for format_step calculation
- Remove unused variable
Signed-off-by: Jan Höppner <hoeppner@linux.vnet.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 | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h index 4aed5ed70836..ffd77230dce9 100644 --- a/drivers/s390/block/dasd_int.h +++ b/drivers/s390/block/dasd_int.h @@ -241,6 +241,13 @@ struct dasd_ccw_req { typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); /* + * A single CQR can only contain a maximum of 255 CCWs. It is limited by + * the locate record and locate record extended count value which can only hold + * 1 Byte max. + */ +#define DASD_CQR_MAX_CCW 255 + +/* * Unique identifier for dasd device. */ #define UA_NOT_CONFIGURED 0x00 |